Multiplexed electrical wiring system for a truck including driver interface and power switching

• US 4,809,177 A
• Filed: 08/14/1987
• Issued: 02/28/1989
• Est. Priority Date: 08/14/1987
• Status: Expired due to Term

• Current Assignee: International Truck Intellectual Property Co. LLC (Volkswagen AG)
• Original Assignee: Navistar International Transportation Corp. (Volkswagen AG)
• Inventors: Kruse, James W., Windle, W. Eric
• Primary Examiner(s): Laroche, Eugene R.
• Assistant Examiner(s): Mis, David
• Application Number:
  US07/085,661
• Time in Patent Office: 564 Days
• Field of Search: 364/424, 364/426, 364/431.04
• US Class Current: 701/1
• CPC Class Codes: B60R 16/0315 using multiplexing techniques multiplexing for transmission of signals G08C15/00; multiplexing for electrical communication in general H04J
• CPC Class Codes: B60R 2016/0322 Temporary code for documents to be reclassified to G08C, H04L or H04Q

Abstract

The land vehicle electrical system comprises a cab controller including a microprocessor system and a chassis controller including a microprocessor system. The microprocessor systems have a multiplexed coupling therebetween and each system includes a microprocessor substantially identical to the microprocessor in the other system with the hardware in each system being substantially identical and with each microprocessor having slightly different software. The microprocessor utilized in the chassis controller has analog inputs for direct connection to sensors. A public data link and a private data link are provided between the microprocessors for additional and backup communication between them. Smart switches are coupled to one or both of the microprocessors and each switch includes means for indicating its status, open circuit or closed circuit, to a microprocessor and the microprocessor includes means for reading the status of the switch and for controlling the status of the switch. The microprocessor also have a diagnostic routine for diagnostic capability or fault isolation. Furthermore, the cab controller includes a visual display having touch actuated switch function areas on the screen of the visual display which switch function areas can be actuated to call up different menus and different control panels.

Claims

1. A land vehicle electrical system including a battery, battery charging means for energizing the battery, controller means which may assume a number of controller states for regulating the flow of electricity to driven devices, sensor means for monitoring various parameters of operation of the land vehicle and land vehicle components, input means for affecting the controller state and for regulating the flow of electricity to driven devices, and display means for providing information concerning the operation of the land vehicle and land vehicle components, said controller means including a cab controller, a chassis controller and controller memory distributed between said cab controller and said chassis controller, said cab controller including a cab memory, a cab microprocessor to which chassis functions are assigned, cab sensor input means for sensing signals from said sensor means, cab output means for affecting driven devices in accordance with the cab controller state, and cab communication means for receiving and transmitting digital signals, said chassis controller including a chassis memory, a chassis microprocessor to which chassis functions are assigned, chassis sensor input means for sensing signals from said sensor means, chassis output means for affecting driven devices in accordance with the chassis controller state, and chassis communication means for receiving and transmitting digital signals, said chassis controller having substantially identical components as said cab controller;

a controller bus coupled between said respective communication means of said cab controller and said chassis controller for exchanging digital data among said system components, said sensor means selectively including analog, switched digital sensors selectively coupled to the respective sensor input means of said cab controller and said chassis controller, said driven devices being operatively connected to the output means of said cab controller, said output means of said chassis controller, and to said input means of said controller means.

2. The system of claim 1 wherein said input means includes a plurality of mechanical switches for affecting the driven devices and selectively presenting a signal to said controller means through dedicated parallel inputs.

3. The system of claim 2 wherein said input means includes a serial device for presenting a signal to said controller means through a serial input;

and said display means includes an alpha-numeric readout to provide information concerning the operation of the land vehicle and land vehicle components to a land vehicle operator.

4. The system of claim 1 wherein said display means displays alpha-numeric characters which are readily readable in ambient light levels.

5. The system of claim 4 wherein said display means is a liquid crystal display.

6. The system of claim 4 wherein said display means is electro-luminescent.

7. The system of claim 4 wherein said display means is at least partially integrated with said input means in a display and information unit which provides information in menu form and accepts an operator input provided by approaching a portion of a displayed menu.

8. The system of claim 7 wherein said input means acts in response to a change in capacitance of the portion of the displayed menu.

9. The system of claim 7 wherein said input means acts in response to a change in resistance of the portion of the displayed menu.

10. The system of claim 6 wherein said display means has a brightness level exceeding 100 foot lamberts.

11. The system of claim 10 wherein said display means is at least partially integrated with said input means in a display and information unit which provides information in menu form and accepts an operator input provided by touching a portion of a displayed menu.

12. The system of claim 1 wherein said controller bus includes a first bus and a second bus which are selectively redundant for selected information in the event of a transmission failure of one of the buses.

13. The system of claim 12 wherein said first bus is electrical and conveys electrical signals;

said second bus is a fibre optic link and conveys light signals; and

said respective communication means of said cab controller and said chassis controller have electro-optical conversion means in operative connection with said second bus.

14. The system of claim 1 wherein said controller bus includes a public bus operating in conformity with industrial standards and a private bus.

15. The system of claim 14 wherein said public bus and said private bus are selectively redundant for selected information in the event of a transmission failure of one of the buses.

16. The system of claim 15 wherein said private bus is a fibre optic link and conveys light signals;

and said respective communication means of said cab controller and said chassis controller have electrooptical conversion means in operative connection with said private bus.

17. The system of claim 1 further including a plurality of device drivers operatively and selectively interconnected with said output means of said cab controller and said chassis controller for regulating the flow of electricity to said driven devices.

18. The system of claim 17 further including freewheeling diodes which protect said device drivers against a rise in voltage appearing at the output of a device driver which could arise from interrupting the flow of electricity to an inductive driven device.

19. The system of claim 17 wherein said device drivers include solid state device drivers which may be selectively employed individually and in parallel to regulate the flow of electricity to said driven devices.

20. The system of claim 19 wherein one or more of said solid state device drivers directly regulates the flow of electricity in a starter solenoid of a relatively large displacement diesel engine in the land vehicle.

21. The system of claim 19 wherein said solid state device drivers include logic level controlled power switches selectively within said output means of said cab controller and said chassis controller.

22. The system of claim 21 wherein said power switches further include an interrogation terminal as well as other terminals adapted to regulate the flow of electricity to driven devices, the interrogation and other terminals, when appropriately energized, providing status information concerning the normalcy of the function of said power switches in conjunction with said driven devices and providing information on abnormal conditions of an open conduction path to said driven devices, a shorted conduction path to said driven devices, and a malfunction of said power switch;

and said cab microprocessor and said chassis microprocessor periodically elicit status information which is retained in said controller memory.

23. The system of claim 1 further including a cab regulator in said cab controller for conditioning the power drawn from said battery supplying power to said cab controller and including a supply switch operatively connected to said controller bus and an output of said cab microprocessor, said supply switch being responsive to the presence of a signal on said control bus and the output of said cab microprocessor to supply power to said cab controller and, in the absence of a signal, interrupting the supply of power to said cab controller;

a chassis regulator in said chassis controller for conditioning the power drawn from said battery supplying power to said chassis controller including a supply switch operatively connected to said controller bus and an output of said chassis microprocessor, said supply switch being responsive to the presence of a signal on said control bus and the output of said chassis microprocessor to supply power to said chassis controller and, in the absence of a signal, interrupting the supply of power to said chassis controller; and

said input means includes a connection selectively to said supply switch in said cab controller and said chassis controller to initiate the supply of power.

24. The system of claim 23 further including a plurality of isolation diodes interposed between said supply switches and signal lines conveying the signals to which said supply switches are responsive;

said supply switches include means for maintaining the supply of power to their associated controllers for a predetermined time after a signal is no longer present; and

said input means include mechanical input switches which are connected to semiconductor input switches, said semiconductor switches in turn being connected to an associated isolation diode.

25. The system of claim 1 wherein said memory of said controller means stores a plurality of display menus including a main menu which in the absence of an ongoing interaction between said input means and said controller for a predetermined periods is displayed on said display means, and which selectively provides information to a land vehicle operator concerning the manner in which other menus will be displayed on said display means by operator activation of said input means.

26. The system of claim 25 wherein the plurality of means includes at least one of the following:

a start menu to guide the operator in starting an engine of the land vehicle;

a radio menu to guide the operator in affecting a radio of the land vehicle;

a climate control menu to guide the operator in affecting components of the land vehicle which provide heated and cooled air to a compartment in which the operator occupies; and

a diagnostic menu to guide the operator in selectively determining whether said land vehicle and components are operating properly and whether the land vehicle and components have properly operated in the past.

27. The system of claim 25 wherein said plurality of menus selectively display information concerning the present operation of the land vehicle and components.

28. The system of claim 1 wherein said land vehicle is a truck which includes at least one of a plurality of truck components;

and said controller memory contains information as to which truck components have been included among the plurality of truck components with appropriate information concerning the particular operation of selected components.

29. The system of claim 1 wherein said sensor means include, a plurality of cab analog sensors connected to said cab sensor input means for providing an analog signal conveying the sensed quantity;

a plurality of cab switches connected to said cab sensor input means for providing a status signal conveying the occurrence of a sensed state;

a plurality of chassis analog sensors connected to said chassis sensor input means for providing an analog signal conveying the sensed quantity; and

a plurality of chassis switches connected to said chassis sensor input means for providing a status signal conveying the occurrence of a sensed state.

30. An electrical system controller for a land vehicle comprising:

a controller microprocessor operatively connected to other controller elements;

a controller memory operatively connected to said controller microprocessor;

controller sensor input means operatively connected to said controller microprocessor;

a plurality of controller device drivers, each of which has an on state and an off state operatively connected to said controller microprocessor for receiving logic level signals from said controller microprocessor and altering the device driver state between on and off in response to the logic level signals;

controller input means operatively connected to said controller microprocessor;

analog sensor means connected to said controller sensor input means for providing analog information concerning a sensed quantity;

digital sensor means connected to said controller sensor input means for providing a state status signal conveying the occurrence of a sensed state;

a plurality of driven devices connected to at least one of said controller device drivers; and

display means operationally connected to said controller microprocessor for providing information concerning the operation of the land vehicle and land vehicle components.

31. The system of claim 30 further including freewheeling diodes which protect controller device drivers against a rise in voltage appearing at the output of a controller device driver which could arise from interrupting the flow of electricity to an inductive driven device.

32. The system of claim 30 wherein said controller device drivers include solid state device drivers which may be selectively employed individually and in parallel to regulate the flow of electricity to said driven devices.

33. The system of claim 32 wherein one or more of said solid state device drivers directly regulates the flow of electricity in a starter solenoid of a relatively large displacement diesel engine in the land vehicle.

34. The system of claim 32 wherein said solid state device drivers further include an interrogation terminal as well as other terminals adapted to regulate the flow of electricity to driven devices, the interrogation and other terminals when appropriately energized providing status information concerning the normalcy of the function of said solid state device drivers in conjunction with said driven devices and providing abnormal conditions of an open conduction path to said driven devices, a shorted conduction path to said driven devices, and a malfunction of said power switch;

and said controller microprocessor being operable to periodically and appropriately energize the terminals of said power switches in the output means of the controller to elicit status information which is retained in said controller memory.

35. The system of claim 30 further including a controller regulator for conditioning the power drawn from said battery supplying power to said controller including a supply switch selectively and operatively connected to said controller input means and said controller microprocessor, said supply switch being responsive to the presence of a signal in said controller input means and said controller microprocessor to supply power to said controller microprocessor and, in the absence of a signal, interrupting the supply of power to said controller microprocessor and associated components;

and said input means includes a connection to said supply switch in said controller regulator to initiate the supply of power.

36. The system of claim 35 further including a plurality of isolation diodes interposed between said supply switch and signal lines conveying the signals to which said supply switch is responsive;

said supply switch including means for maintaining the supply of power to the controller for a predetermined time after a signal is no longer present; and

said input means including mechanical input switches which are connected to semiconductor input switches, said semiconductor switches in turn being connected to an associated isolation diode.

37. The system of claim 30 wherein said controller memory stores a plurality of display menus including a main menu which in the absence of an ongoing interaction between said controller input means and said controller microprocessor for a predetermined period is displayed on said display means, and which selectively provides information to a land vehicle operator concerning the manner in which other menus will be displayed on said display means by operator activation of said controller input means.

38. The system of claim 37 wherein the plurality of menus includes at least one of the following:

a start menu to guide the operator in starting an engine of the land vehicle;

a radio menu to guide the operator in operating a radio of the land vehicle;

a climate control menu to guide the operator in affecting components of the land vehicle which provide heated and cooled air to a compartment which the operator occupies; and

a diagnostic menu to guide the operator in selectively determining whether the land vehicle and components are operating properly and whether the land vehicle and components have properly operated in the past.

39. The system of claim 38 wherein said plurality of menus selectively display information concerning the present operation of the land vehicle and components.

40. The system of claim 37 wherein the plurality of menus includes a diagnostic menu to guide the operator in selectively determining whether said land vehicle and components are operating properly and whether the land vehicle and components have properly operated in the past;

said solid state device drivers further include an interrogation terminal as well as other terminals adapted to regulate the flow of electricity to driven devices, the interrogation and other terminals when appropriately energized providing status information concerning the normalcy of the function of said solid state device drivers in conjunction with said driven devices and providing information of abnormal conditions of an open conduction path to said driven devices, a shorted conduction path to said driven devices, and a malfunction of said power switch; and

said controller microprocessor periodically and appropriately energizes the terminals of said power switches in the output means of the controller to elicit status information which is retained in said controller memory for selective display on said diagnostic menu.

41. The system of claim 30 wherein said land vehicle is a truck which includes at least one of a plurality of truck components;

and said controller memory contains information as to which truck components have been included among the plurality of truck components with appropriate information concerning the particular operation of selected components.

42. The system of claim 30 wherein said display means displays alpha-numeric characters which are readily readable in ambient light levels.

43. The system of claim 42 wherein said display means is a liquid crystal display.

44. The system of claim 42 wherein said display means is electro-luminescent.

45. The system of claim 42 wherein said display means is at least partially integrated with said input means in a display and information unit which provides information in menu form and accepts an operator input provided by approaching a portion of a displayed menu.

46. The system of claim 45 wherein said input means acts in response to a change in capacitance of the portion of the displayed menu.

47. The system of claim 45 wherein said input means acts in response to a change in resistance of the portion of the displayed menu.

48. The system of claim 45 wherein said display means has a brightness level exceeding 100 foot lamberts.

49. The system of claim 48 wherein said display means is at least partially integrated with said input means in a display and information unit which provides information in menu form and accepts an operator input provided by touching a portion of a displayed.

50. In a land vehicle electrical system the improvement comprising a cab controller and a chassis controller each comprising substantially the same microprocessor and a multiplexing system coupling said controller together.

51. In a land vehicle electrical system the improvement comprising a controller including a microprocessor having analog inputs and sensors coupled directly into said analog inputs.

52. In a land vehicle electrical system the improvement comprising a controller including a microprocessor having analog inputs and smart switches connected to said analog inputs and having means for communicating to said microprocessor the status of said switch, open circuit and close circuit, and said microprocessor having means for controlling the status of said switches.

53. In a land vehicle electrical system the improvement comprising a cab controller including a microprocessor system, a chassis controller including a microprocessor system, and a public serial data link and a private data link conforming to industrial standards.

54. In a land vehicle electrical system the improvement comprising a cab controller including a microprocessor system comprising a microprocessor, a visual display coupled to said microprocessor and said visual display having touch sensitive switch function areas on the display and means actuated by touching various switch function areas for calling up different menus and different control panels on the visual display.

55. In a land vehicle electrical system the improvement comprising cab controller including a microprocessor system, said microprocessor system including means for effecting a diagnostic evaluation of various instruments and sensors coupled directly or indirectly to said cab controller and indicating to the cab controller if an instrument or sensor is nonfunctioning.

56. In a land vehicle electrical system the improvement comprising cab controller including a microprocessor system, said microprocessor system including means for effecting a diagnostic evaluation of various instruments and sensors coupled directly or indirectly to said cab controller and indicating to the cab controller if an instrument or sensor is out of range.