Solid state mow system for electrically powered mower

• US 5,934,051 A
• Filed: 02/06/1997
• Issued: 08/10/1999
• Est. Priority Date: 02/06/1997
• Status: Expired due to Term

• Current Assignee: Textron IPMP L.P
• Original Assignee: Textron Inc
• Inventors: Hahn, Robert W.
• Primary Examiner(s): Carone, Michael J.
• Assistant Examiner(s): FRENCH, FREDRICK T
• Application Number:
  US08/798,424
• Time in Patent Office: 915 Days
• Field of Search: 56/10.2 R, 56/10.2 A, 56/10.5, 180/273
• US Class Current: 56/10.20R
• CPC Class Codes: A01D 34/006 Control or measuring arrangements
• CPC Class Codes: B60K 1/00 Arrangement or mounting of electrical propulsion units B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00; electric transmission arrangements B60K17/12; electric equipment or propulsion of electrically-propelled vehicles per se B60L; current-collectors for power supply lines of electrically-propelled vehicles B60L5/00
• CPC Class Codes: B60K 1/04 of the electric storage means for propulsion exchanging batteries for electric propulsion of vehicles B60L53/80; for auxiliary purposes only B60R16/04; supplying batteries to, or removing batteries from, vehicles B60S5/06
• CPC Class Codes: B60K 2001/0416 Arrangement in the rear part of the vehicle
• CPC Class Codes: B60K 28/04 responsive to presence or absence of the driver, e.g. to weight or lack thereof
• CPC Class Codes: B60Y 2200/223 Ridable lawn mowers

Abstract

A solid state mow system monitors and controls operations of a greens maintenance machine. This solid state system controls the other systems on the machine including: an interlock system, a reel lift control system, a cutting unit control system, a groomer control system, a backlap control system, a mow relay system or any other greens maintenance type system. The interlock system monitors input and output signals to determine if all of the preconditions to operation have been satisfied. The lift control system controls raising and lowering the cutting units. The mow control system controls the operation of cutting unit motors.

Claims

1. A solid state control system for a mower comprising:

an interlock system located in a programmable logic device, the interlock system to monitor input signals to the solid state control system and to enable operation of the mower;

a cutting unit control system operably connected to the interlock system, the cutting unit control system to control power to at least one cuffing unit;

a lift control operably connected to the interlock system, the lift control system to selectively raise and lower the at least one cutting unit; and

a groomer control system operably connected to the interlock system, the groomer control system to control a groomer used in conjunction with the at least one cutting unit.

13. The solid state control system of claim 1 wherein the groomer control further comprises:

an interlock signal from the interlock system to indicate that the interlock system is enabled;

a selected signal from the control panel indicating if the cutting unit is selected;

an activation signal from a control panel indicating activation of the cutting unit;

a mow signal from the mow control to provide power to the cutting unit; and

a groom signal from the control panel to provide power to at least one groomer.

2. A solid state control system for a mower comprising:

an interlock system located in a programmable logic device, the interlock system to monitor input signals to the solid state control system and to enable operation of the mower;

a cutting unit control system operably connected to the interlock system, the cutting unit control system to control power to at least one cutting unit;

a lift control operably connected to the interlock system, the lift control system to selectively raise and lower the at least one cutting unit;

a backlap switch; and

a backlap control system operably connected to the backlap switch, the backlap control system to power the at least one cutting unit in reverse upon activation of the backlap switch.

14. The solid state control system of claim 2 wherein the backlap control further comprises:

a signal from a control panel indicating if a brake is applied;

a signal from an ignition indicating if a key has been inserted;

a signal from the control panel indicating if backlap mode has been selected;

an activation signal from the control panel indicating activation of the cutting unit; and

a mow signal from the mow control to provide power to the cutting unit.

3. A solid state control system for a mower comprising:

an interlock system located in a programmable logic device, the interlock system to monitor input signals to the solid state control system and to enable operation of the mower;

a cutting unit control system operably connected to the interlock system, the cutting unit control system to control power to at least one cutting unit;

a lift control operably connected to the interlock system, the lift control system to selectively raise and lower the at least one cutting unit;

a current detector located inside the cutting unit control system, the current detector to detect a current in a motor above a preset value;

an overload timer operatively connected to the current detector, the overload timer counting time the current in the motor remains above the preset value; and

a relay operatively connected in a circuit with the motor, the relay to open the circuit when the overload timer has detected the current above the preset value for the set amount of time.

4. The solid state control system of claim 3 further comprising an overload indicator located on an operator control panel, the overload indicator activated by the overload timer after the overload timer has detected the current above the preset value for a set amount of time.

5. A solid state control system for a mower comprising:

an interlock system located in a programmable logic device, the interlock system to monitor input signals to the solid state control system and to enable operation of the mower;

a cutting unit control system operably connected to the interlock system, the cutting unit control system to control power to at least one cutting unit;

a lift control operably connected to the interlock system, the lift control system to selectively raise and lower the at least one cutting unit;

a current detector located inside the lift control system, the current detector to detect a current in the lift control system above a preset value;

an overload timer operatively connected to the current detector, the overload timer counting time the current in the lift control system remains above the preset value; and

a relay operatively connected in a circuit with the lift control system, the relay to open the circuit when the overload timer has detected the current above the preset value for the set amount of time.

6. The solid state control system of claim 5 further comprising an overload indicator located on an operator control panel, the overload indicator activated by the overload timer after the overload timer has detected the current above the preset value for a set amount of time.

7. A solid state control system for a mower comprising:

an interlock system located in a programmable logic device, the interlock system to monitor input signals to the solid state control system and to enable operation of the mower;

a cutting unit control system operably connected to the interlock system, the cutting unit control system to control power to at least one cutting unit;

a lift control operably connected to the interlock system, the lift control system to selectively raise and lower the at least one cutting unit;

a current detector located the groomer control system, the current detector to detect a current in the groomer control system above a preset value;

an overload timer operatively connected to the current detector, the overload timer counting time the current in the groomer control system remains above the preset value; and

a relay operatively connected in a circuit with the groomer control system, the relay to open the circuit when the overload timer has detected the current above the preset value for the set amount of time.

8. The solid state control system of claim 7 further comprising an overload indicator located on an operator control panel, the overload indicator activated by the overload timer after the overload timer has detected the current above the preset value for a set amount of time.

9. The solid state control system of claim 8 wherein the preconditions to operation comprise:

a weight applied to a seat; and

a brake is applied to the mower.

10. The solid state control system of claim 9 wherein the preconditions to operation further include that a backlap mode not activated.

11. A solid state control system for a mower comprising:

an interlock system located in a programmable logic device, the interlock system to monitor input signals to the solid state control system and to enable operation of the mower;

a cutting unit control system operably connected to the interlock system, the cutting unit control system to control power to at least one cutting unit;

a lift control operably connected to the interlock system, the lift control system to selectively raise and lower the at least one cutting unit;

an interlock signal from the interlock system to indicate that the interlock system is enabled;

an activation signal from a control panel indicating activation of the lift control;

a selected signal from the control panel indicating if the cutting unit is selected;

a position signal from a cutting unit control module indicating a position of the cutting unit; and

a lift control signal from the lift control to provide power to a lift mechanically connected to the cutting unit.

12. A solid state control system for a mower comprising:

an interlock system located in a programmable logic device, the interlock system to monitor input signals to the solid state control system and to enable operation of the mower;

a cutting unit control system operably connected to the interlock system, the cutting unit control system to control power to at least one cutting unit;

a lift control operably connected to the interlock system, the lift control system to selectively raise and lower the at least one cutting unit;

an interlock signal from the interlock system to indicate that the interlock system is enabled;

a selected signal from the control panel indicating if the cutting unit is selected;

an activation signal from a control panel indicating activation of the cutting unit; and

a mow signal from the mow control to provide power to the one cutting unit.

15. A method for safely starting a mower controlled by a solid state control system comprising the steps of:

receiving an ignition signal in the solid state controller from an ignition, the ignition signal supplying power to the solid state controller;

receiving a start signal from the ignition indicating that the solid state control system is enabled;

receiving a seat signal from a seat switch indicating that an operator is present in an operator seat;

receiving a brake signal from a brake switch indicating that the brake is applied;

receiving a master mow signal from a master mow switch indicating that a cutting unit is active to mow; and

sending a ready signal to systems in the solid state controller indicating that the mower is ready to operate.

16. The method of claim 15 further comprising the step of providing power to an indicator light showing that the mower is ready to operate.

17. The method of claim 15 further comprising the step of receiving a backlap signal from a backlap switch indicating that the cutting unit on the mower is disabled to operate in reverse.

18. A method for operating at least one lift on a mower controlled by a solid state control system comprising the steps of:

receiving a ready indicating that the mower is ready to operate;

receiving a location signal indicating a position of the at least one lift;

receiving a toggle signal to change the position of the at least one lift;

sending a position signal to the at least one lift to change position;

providing power to the at least one lift; and

changing position of the at least one lift.

19. The method of claim 18 further comprising the step of receiving a selection signal indicating that at least one cutting unit operably connected to the at least one lift is selected.

20. The method of claim 18 further comprising the step of monitoring the current powering a lift motor.

21. The method of claim 20 further comprising the steps of:

determining if the current across the lift motor is above a preset value; and

if the current across the lift motor is above a preset value, disconnecting power to the at least one lift.

22. A method for operating at least one cutting unit on a mower controlled by a solid state control system comprising the steps of:

receiving a ready signal indicating that the mower is ready to operate;

receiving a selected signal for the at least one cutting unit from an operator interface, the selected signal indicating that the at least one cutting unit has been selected to operate;

providing power to the at least one cutting unit; and

operating the at least one cutting unit.

23. The method of claim 22 further comprising the step of monitoring the current powering a motor for the at least one cutting unit.

24. The method of claim 23 further comprising the steps of:

determining if the current across the motor is above a preset value; and

if the current across the cutting unit motor is above a preset value, disconnecting power to the at least one cutting unit.

25. A method for operating at least one groomer on a mower controlled by a solid state control system comprising the steps of:

receiving a ready signal indicating that the mower is ready to operate;

receiving a groom signal from an operator panel;

providing power to the at least groomer; and

operating the at least one groomer.

26. The method of claim 25 further comprising the step of monitoring the current powering a motor for the at least one groomer.

27. The method of claim 26 further comprising the steps of:

determining if the current across the motor is above a preset value; and

if the current across the groomer motor is above a preset value, disconnecting power to the at least one cutting unit.

28. A method for operating at least one cutting unit in reverse on a mower controlled by a solid state control system comprising the steps of:

receiving a power signal from an ignition;

receiving a ready signal indicating that the mower is ready to operate;

receiving a brake signal from an operator interface indicating a brake is applied;

receiving a selection signal indicating that a cutting unit has been selected;

receiving a backlap signal from the operator interface indicating the intention to operate the cutting unit in reverse;

sending a signal to the cutting unit to operate in reverse; and

providing power to the cutting unit.

29. A method for monitoring the operation of a mower controlled by a solid state control system comprising the steps of:

receiving a power signal from an ignition;

receiving a first status signal from at least one cutting unit;

receiving a second status signal from at least one lift;

monitoring the first and second status signals to determine if a fault in power to the cutting unit or a fault in power to the lift has occurred;

interrupting power to the cutting unit if the fault in power to the cutting unit has occurred; and

interrupting power to the lift if the fault in power to the lift has occurred.