Lawn and garden control module

• US 6,609,357 B1
• Filed: 01/31/2002
• Issued: 08/26/2003
• Est. Priority Date: 01/31/2002
• Status: Expired due to Term

• Current Assignee: Delta Systems Inc.
• Original Assignee: Delta Systems Inc.
• Inventors: Wetzel, Theodore G., Davis, Dennis L., Rundo, James, Harvey, Arthur James
• Primary Examiner(s): Pezzuto, Robert E.
• Application Number:
  US10/062,029
• Time in Patent Office: 572 Days
• Field of Search: 56/1, 56/102.R, 56/102.A, 56/135, 56/105, 56/108, 56/133, 56/118, 56/119, 56D/IG.15, 701/25, 701/28, 180/168, 180/169, 180/6.5
• US Class Current: 56/10.20A
• CPC Class Codes: A01D 2101/00 Lawn-mowers
• CPC Class Codes: A01D 34/006 Control or measuring arrangements
• CPC Class Codes: B60Q 2800/20 Utility vehicles, e.g. for agriculture, construction work
• CPC Class Codes: B60Q 9/001 Alarm devices when the motor is stopped and the lights are on

Abstract

Control method and apparatus for a lawn mower or a lawn and garden tractor that includes a programmable controller for monitoring a mower/tractor status. The controller includes an interface for monitoring inputs relating to a status of the mower/tractor and controlling outputs that regulate operation of the mower/tractor. The controller also includes a memory for storing instructions to implement a control over operation of the mower/tractor. The instructions include instructions for determining a safety status condition based on sensed inputs and outputting a signal from the interface of the controller that inhibits operation of a lawn mower/tractor motor or engine in response to a determination of the safety status condition.

Claims

1. Control apparatus for monitoring and controlling operation of a lawn mower, said lawn mower including a mowing blade and further including an input switch that controls operation of a lawn mower source of power, said control apparatus comprising:

a) a programmable controller for monitoring a status of said lawn mower, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower and for controlling outputs that regulate operation of the lawn mower and ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower; and

b) a visual display coupled to the programmable controller for displaying an updated status of the mower wherein said instructions enable said controller to determine a status condition based on sensed inputs and to output a signal from the interface of said controller that updates the display based on said status condition;

c) said controller including in said controller memory a specific message for display on the visual display at predetermined intervals during operation of said lawn mower.

2. The control apparatus of claim 1 wherein the controller interface includes an I/O port for receipt of messages for storage in the controller memory for display on the visual display.

3. Control apparatus for monitoring and controlling operation of a lawn mower, said lawn mower including a clutch for engaging a blade and further including an input switch that controls operation of a lawn mower source of power that selectively rotates the blade based on a condition of the clutch, said control apparatus comprising:

a) a programmable controller for monitoring a status of said lawn mower, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower and for controlling outputs that regulate operation of the lawn mower and ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower;

b) said instructions including instructions for determining a safety status condition based on sensed inputs and outputting a signal from the interface of said controller that both disengages the clutch and inhibits operation of the source of power in response to a sensing of an unsafe condition.

4. The control apparatus of claim 3 wherein the lawn mower source of power comprises an internal combustion engine and wherein the programmable controller includes instructions that inhibit operation of said lawn mower by shorting a connection across an engine magneto and also disrupts supply of fuel to said engine.

5. The control apparatus of claim 3 wherein the lawn mower source of power comprises an internal combustion engine having a fuel injection system and wherein the programmable controller includes instructions that inhibit operation of said lawn mower by stopping a flow of fuel to said fuel injection system.

6. The apparatus of claim 3 wherein the lawn mower comprises a plurality of switches and wherein the instructions of the programmable controller stores a count of switch actuations for at least one of said switches and stores said count in a non-volatile memory.

7. Control apparatus for monitoring and controlling operation of a lawn mower, said lawn mower including a mowing blade and further including a first input switch that controls operation of a lawn mower source of power, said control apparatus comprising:

a) a programmable controller for monitoring a status of said lawn mower, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower and for controlling outputs that regulate operation of the lawn mower and ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower; and

b) said controller interface coupled to a plurality of input switches for monitoring a plurality of signals corresponding to status conditions of said plurality of input switches during operation of the lawn mower;

c) said instructions including instructions for storing a number of switch actuations for one or more of said plurality of input switches in a non-volatile memory.

8. Control apparatus for monitoring and controlling operation of a lawn mower, said lawn mower including a mowing blade and further including a first input switch that controls operation of a lawn mower source of power, said control apparatus comprising:

a) a programmable controller for monitoring a status of said lawn mower, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower and for controlling outputs that regulate operation of the lawn mower and ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower;

b) said controller interface coupled to a plurality of input switches for monitoring a plurality of signals corresponding to status conditions of said plurality of input switches during operation of the lawn mower; and

c) a connector for routing signals to the controller interface from switches supported by the lawn mower and further comprising a test circuit that can be coupled to the connector for communicating signals to and from the programmable controller.

9. The controller of claim 8 wherein the test circuit simulates a lawn mower circuit external to the controller for determining an operating status of said controller without being connected to a lawn mower.

10. The controller apparatus of claim 8 wherein the test circuit communicates data for reprogramming operation of the controller.

11. Control apparatus for monitoring and controlling operation of a lawn mower, said lawn mower including a mowing blade and further including a source of power for rotating the blade, said control apparatus comprising:

a) a programmable controller for monitoring a status of said lawn mower, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower and for controlling outputs that regulate operation of the lawn mower and ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower; and

b) wherein the lawn mower source of power comprises an engine or motor that is one of a number of types and wherein the controller determines a drive type by evaluating signals from the engine or motor that vary depending on engine or motor type.

12. The control apparatus of claim 11 wherein the lawn mower includes an internal combustion engine that includes a spark generating device for creating a spark at specified intervals to ignite fuel in one or more cylinders of said engine and further wherein said controller interface includes circuitry for converting signals from the spark generating device to determine an engine type.

13. The control apparatus of claim 12 wherein the controller monitors time intervals between receipt of said signals from the spark generating device in order to determine engine type.

14. The control apparatus of claim 13 wherein the timing of receipt of signals from the spark generating device is used by the controller to determine engine speed.

15. The control apparatus of claim 14 wherein the controller distinguishes between a single cylinder and a two cylinder internal combustion engine based on the signal timing.

16. Control apparatus for monitoring and controlling operation of a lawn mower, said lawn mower including a mowing blade and further including an ignition switch that controls operation of a lawn mower source of power that rotates said blade by coupling a battery signal through a lawn mower ignition system in response to user actuation of said ignition switch, said control apparatus comprising:

a) a programmable controller for monitoring a status of said lawn mower, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower and for controlling outputs that regulate operation of the lawn mower and ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower; and

b) a visual display coupled to the programmable controller for displaying an updated status of the mower wherein said instructions enable said controller to determine a status condition based on sensed inputs and to output a signal from the interface of said controller that updates the display based on said status condition;

c) said controller interface including an input for monitoring battery voltage and updating the visual display based on a sensed battery voltage.

17. The apparatus of claim 16 wherein the battery voltage is coupled to a starter and the message informs a user when the sensed battery voltage is too low to operate said starter.

18. The control apparatus of claim 16 wherein the lawn mower includes an internal combustion engine and an alternator for charging the battery and wherein the programmable controller monitors battery voltage with the engine running and wherein the visual display is updated to indicate a problem with charging of the battery.

19. Control apparatus for monitoring and controlling operation of a lawn mower, said lawn mower including a mowing blade, a source of power for rotating the blade, and including an starter system having a battery that controls operation of said source of power, said control apparatus comprising:

a) a programmable controller for monitoring a status of said lawn mower, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower and for controlling outputs that regulate operation of the lawn mower and ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower; and

b) a visual display coupled to the programmable controller for displaying an updated status of the mower wherein said instructions enable said controller to determine a status condition based on sensed inputs and to update the display based on a sensed status condition;

c) said controller interface including an input for determining if the source of power is activated and wherein said instructions place the programmable controller in a low power consumption mode to conserve battery life.

20. The apparatus of claim 19 wherein the controller times a period of no operation of the source of power and activates the low power consumption mode after a specified period of no operation of said source of power.

21. The apparatus of claim 19 wherein the controller disables the monitoring of the status of certain inputs to conserve battery life in said low consumption mode.

22. The apparatus of claim 19 wherein the controller is part of a control system and wherein the controller disrupts power to circuitry external to the controller that forms part of the control system to conserve battery life.

23. The apparatus of claim 19 wherein the controller disables the visual display to conserve battery life.

24. The apparatus of claim 19 wherein the controller includes analog to digital inputs and wherein one or more of the analog to digital inputs are disabled to conserve battery life.

25. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor; and

g) a visual display coupled to the controller for displaying a status of the lawn mower or the garden tractor based on conditions sensed by inputs to the input and output interface;

h) said controller including in said controller memory a specific message for display on the visual display at predetermined intervals during operation of said lawn mower.

26. The apparatus of claim 25 wherein the controller interface includes an I/O port for receipt of messages for storage in the controller memory for display on the visual display.

27. The apparatus of claim 25 additionally comprising a control panel in proximity to the operator zone including a sensor mounted to the control panel for monitoring a presence of an operator, said sensor interfacing with the controller.

28. The apparatus of claim 25 additionally comprising a control panel in proximity to said seat including a pad for sensing the presence of a magnetic object which resets one or more memory locations maintained by the controller.

29. The apparatus of claim 25 wherein the controller implements an hourmeter on the visual display based on operation of the lawn mower or garden tractor.

30. The apparatus of claim 29 wherein the hourmeter is updated based on periods of operation of the engine or motor.

31. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor; and

g) wherein the controller monitors speed of movement of the lawn mower or garden tractor and engine or motor speed and wherein the controller outputs a signal based on the combination of speed of movement and engine or motor speed.

32. The apparatus of claim 31 additionally comprising a visual display coupled to the controller and a cutting blade coupleable to the engine or motor through the power take off and wherein the controller updates the display to convey information about cutting efficiency of the cutting blade on the visual display based on the sensed speed of movement and an engine or motor speed.

33. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the riding lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor;

g) wherein the lawn mower or garden tractor includes an internal combustion engine and wherein the programmable controller instructions inhibit operation of said lawn mower or garden tractor by shorting a connection across an engine magneto and additionally discontinues supply of fuel to said engine.

34. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor;

g) wherein the lawn mower or garden tractor includes an internal combustion engine and wherein the programmable controller controls delivery of fuel to said engine by means of a fuel solenoid that opens and closes a fuel valve.

35. The apparatus of claim 34 wherein the programmable controller confirms a status of a control signal output to the fuel solenoid for disrupting delivery of fuel to the engine by monitoring a signal coupled to the solenoid that changes state in response to an output from the interface of said controller.

36. The apparatus of claim 34 wherein the controller updates a visual display in the event it is unable to confirm the status based on the monitoring to indicate a loss of control over the fuel solenoid.

37. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor;

g) wherein the control for selectively engaging the power take off comprises a clutch and wherein the programmable controller sends a signal to the control to disengage the clutch and confirms a status of the clutch based on a change of state of a signal for monitoring a status of the clutch.

38. The apparatus of claim 37 wherein the controller updates a visual display in the event it is unable to confirm the status based on the monitoring to indicate a loss of control over the clutch.

39. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor and a plurality of additional switches that control operation of the lawn mower or garden tractor;

e) a control for selectively engaging the power take off;

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor; and

g) wherein the controller stores a count of switch actuations in a controller memory.

40. The apparatus of claim 39 wherein the controller determines a safety status condition of the lawn mower or garden tractor based on a sensing of the status of one or more of the plurality of additional switches and wherein said controller deactivates the source of power in response to the sensed safety status condition.

41. The apparatus of claim 39 comprising a clutch for engaging the power take off and further comprising a power take off control switch for controlling a status of the clutch and wherein the controller determines a safety status condition of the lawn mower or garden tractor based on a sensing of the status of one or more additional input signals and wherein said controller controls a status of said clutch to decouple the source of power from the power take off in response to the sensed safety status condition.

42. The apparatus of claim 41 wherein the controller maintains a clutch state until the user toggles the power take off control switch off and on.

43. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the riding lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor and a plurality of additional switches that control operation of the lawn mower or garden tractor, said plurality of switches including a power take off switch and a reverse switch;

e) a control for selectively engaging the power take off in response to actuation of the power take off switch;

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor; and

g) said controller including instructions for monitoring simultaneous activation of the reverse and power take off switch and for deactivating the power take off if both the reverse and the power take off switch are actuated.

44. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an internal combustion engine for rotating one or more wheels of the riding lawn mower or garden tractor;

d) a clutch for selectively engaging the power take off;

e) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor;

f) an ignition switch coupled to the controller that can be actuated by the operator to start the engine;

g) a starter coupled to an output of the controller for starting the engine;

h) a single pole switch coupled to the controller for controlling the clutch to selectively engage the power take off input and for monitoring an operator presence on said seat; and

i) a single pole switch coupled to the controller for monitoring an operator presence within the operator zone;

j) said controller monitoring the inputs to determine if a start signal is coupled to the controller from the ignition switch and a safety status of said single pole switches and in response thereto outputting a starter activation signal in response to said start signal to start the engine.

45. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) wherein a location on the chassis defines an operator zone for an operator to occupy during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor; and

g) an optical sensor mounted to the chassis for determining presence of an operator on the lawn mower or garden tractor and for communicating a signal indicating said presence to the controller;

h) said instructions including instructions for disabling one or more functions of the lawn mower or garden tractor in the event a presence of an operator is not sensed by the optical sensor.

46. A lawn mower or garden tractor comprising:

a) a chassis, wheels, a steering wheel for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining a location of an operator zone for an operator to occupy during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off;

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor; and

g) a sensor mounted to the chassis within reach of the operator for monitoring a presence of a magnetic object for resetting one or more memory locations of said controller in response to the operator moving an magnetic object into proximity to said sensor.

47. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining a location on the chassis for an operator to occupy during operation of the riding lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor;

e) a control for selectively engaging the power take off;

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a controller memory for storing data to implement a control over operation of the lawn mower or garden tractor;

g) a battery for providing power to said controller; and

h) a wiring harness for coupling signals from the first switch and one or more other switches to said controller for conveying a status of the lawn mower or garden tractor to the controller, said wiring harness including a connector that can be disconnected to expose an I/O port of the controller to signals from an alternate source for adjusting data stored in said controller memory.

48. The apparatus of claim 47 additionally comprising a circuit having an interface for engaging the connector to reprogram portions of said controller memory subsequent to installation of said controller on the chassis of the lawn mower or garden tractor.

49. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the riding lawn mower or garden tractor;

d) one or more lamps for illuminating a region of the lawn mower or garden tractor;

e) a first switch that can be actuated by the operator to activate the engine or motor and a plurality of additional switches that control operation of the lawn mower or garden tractor; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor;

g) wherein the controller maintains at least one lamp in an on condition subsequent to a shutting down of the engine or motor.

50. The apparatus of claim 49 wherein the controller maintains the at least one lamp illuminated for a timed interval after said shutting down of the engine or motor.

51. A lawn mower or garden tractor comprising:

a) a chassis, wheels, apparatus for steering the lawn mower or garden tractor, and a power take off;

b) said chassis defining an operator zone during operation of the lawn mower or garden tractor;

c) an engine or motor for rotating one or more wheels of the riding lawn mower or garden tractor;

d) a first switch that can be actuated by the operator to activate the engine or motor and a plurality of additional switches that control operation of the lawn mower or garden tractor;

e) a battery and supported by said chassis; and

f) a controller for monitoring a status of said lawn mower or garden tractor, said controller including i) an input and output interface for monitoring inputs relating to a status of said lawn mower or garden tractor and controlling outputs that regulate operation of the lawn mower or garden tractor and ii) further including a memory for storing instructions to implement a control over operation of the lawn mower or garden tractor;

g) wherein said controller is coupled to the battery to monitor battery voltage and further comprises an interface for coupling to a battery charger for routing battery charger signals to said battery in response to a sensed low battery voltage.

52. A process for controlling operation of a lawn mower or garden tractor having a control for engaging a power take off and an ignition system that controls running of an engine or motor, said process comprising:

a) monitoring a status of said lawn mower or garden tractor by routing input signals representing a status of said lawn mower or garden tractor to a controller;

b) saving one or more status indicating variables in a controller memory for use in implementing a control over operation of the lawn mower or garden tractor;

c) outputting control outputs from a controller interface that regulate operation of the lawn mower or garden tractor;

d) determining a condition of the lawn mower or garden tractor based on sensed input signals and the one or more status indicating variables; and

e) outputting a signal from the interface of said controller to a visual display at a specified time during operation of the lawn mower or garden tractor to display one or more messages stored in a memory of said controller.

53. The process of claim 52 wherein the controller executes a diagnostic mode of operation wherein a status condition of a number of inputs to the controller is monitored and updated on the visual display.

54. The process of claim 53 wherein the controller is coupled to a number of switches for controlling an operating state of said lawn mower or garden tractor and wherein the controller poles a status of said switches in said diagnostics mode and updates the display based on a status of said switch.

55. The process of claim 53 wherein an ignition switch is toggled on an off a specified number of times in a specified interval to cause the controller to enter said diagnostic mode.

56. The process of claim 52 wherein lawn mower or garden tractor has a plurality of switches and wherein the monitoring step repeatedly determines a status of said switches and stores a count of switch actuations in said controller memory.

57. The process of claim 52 wherein the controller determines a safety status condition by comparing the number of switch actuations of different switches to determine if all switches are properly functioning.

58. The process of claim 52 additionally comprising providing a visual output indicating a service reminder to a user based a time period of operation of the lawn mower or garden tractor.

59. The process of claim 52 wherein the lawn mower or garden tractor includes a gasoline powered engine and additionally comprising a step of outputting a signal for inhibiting continued operation of the lawn mower or garden tractor both shorts an engine magneto and disrupts delivery of fuel to an the engine to provide a redundant means of inhibiting further operation of said lawn mower or garden tractor.

60. The process of claim 59 wherein the controller delays shorting of the magneto to allow fuel contained in a fuel line to be burned.

61. The process of claim 52 comprising the step of mounting a sensor pad to the lawn mower or garden tractor control panel and resetting one or more memory locations of said controller in response to bringing an object into proximity with the sensor pad.

62. The process of claim 52 wherein the controller executes an operating system that can be updated by a communications interface with the controller.

63. The process of claim 52 wherein the display messages are changed by means of messages sent to the controller by a communications interface with said controller.

64. The process of claim 52 wherein the controller includes a non-volatile memory and wherein the controller stores a count of switch actuations in said non-volatile memory for subsequent access.

65. The method of claim 52 wherein the controller is coupled to a number of switches for controlling an operating state of said lawn mower or garden tractor and additionally comprising the step of coupling input signals from one or more switches to said controller by providing a regulated current to an input switch terminal and monitoring a voltage drop across the input switch to determine its open or closed status based upon said voltage drop.

66. Control apparatus for monitoring and controlling operation of a lawn mower or garden tractor, said lawn mower or garden tractor including a control for engaging a power take off from a source of power, said control apparatus comprising:

a) a first input switch that controls operation of a source of power that selectively rotates the power take off,

b) one or more additional input switches that control operation of said lawn mower or garden tractor;

c) a programmable controller for monitoring a status of said lawn mower or garden tractor, said controller including i) a controller interface for monitoring inputs relating to a status of said lawn mower or garden tractor and for controlling outputs that regulate operation of the lawn mower and garden tractor ii) said controller further including a controller memory for storing instructions to implement a control over operation of the lawn mower; and

d) interface circuitry for coupled status signals from at least one input switch to said controller, said interface circuitry providing a regulated current to an input switch terminal and monitoring a voltage drop across the input switch to determine its open or closed status.

67. The apparatus of claim 66 wherein the interface circuitry comprises a regulated current source including a transistor coupled to one terminal of said input switch and a comparator having a reference input for defining a switch point of said comparator and including a non-reference input coupled to said one terminal of said input switch for monitoring a voltage on said one terminal, said comparator including an output for communicating a switch state to said controller.