Integrated wiring systems for a vehicle control system

• US 5,832,397 A
• Filed: 10/04/1995
• Issued: 11/03/1998
• Est. Priority Date: 01/21/1993
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Oho, Shigeru, Yoshida, Tatsuya
• Primary Examiner(s): LOUIS JACQUES, JACQUES H
• Application Number:
  US08/539,264
• Time in Patent Office: 1,126 Days
• Field of Search: 364/423.098, 364/431.04, 364/431.07, 364/138, 364/424.045, 364/925, 364/940, 364/424.027, 364/424.036, 364/424.037, 364/424.039 , 364/431.11, 364/431.12, 364/551.01, 364/431.011, 123/339, 123/337, 123/609, 123/416, 123/417, 123/419, 123/618, 123/501, 123/481, 340/825.52, 340/825.07, 340/825.22, 340/825.06, 340/459, 340/438, 73/117.3, 73/117.2
• US Class Current: 701/29
• CPC Class Codes: B60R 16/0315 using multiplexing techniques multiplexing for transmission of signals G08C15/00; multiplexing for electrical communication in general H04J

Abstract

An integrated wiring system for controlling multiple vehicle systems comprising a plurality of terminal control units having different information processing speed and a central control unit. A communications interface is provided in the central control unit in the form of a dedicated programmable input/output processor for performing data communication based on a plurality of communication protocols.

Claims

1. An integrated communications apparatus for use in a vehicle control system for monitoring and controlling operational status of a plurality of vehicle systems, each vehicle system having a local control unit for controlling operation thereof, said local control units being accessible by means of a data communication line, said integrated communications apparatus comprising:

at least one memory unit;

a central processing unit for receiving and processing signals transmitted from said local control units, which signals are indicative of operational status of said plurality of vehicle systems, according to control programs stored in one of said at least one memory unit, and for generating control signals for transmission to said plurality of vehicle systems by means of said data communication line; and

a programmable subprocessor for controlling communications between said central processing unit and said local control units by means of said data communication line, according to at least one of said control programs stored in one of said at least one memory unit.

2. The integrated communications apparatus according to claim 1, further comprising a common memory coupled in communication with said central processing unit and with said subprocessor, whereby said central processing unit can send and receive data to and from said subprocessor.

3. The integrated communications apparatus according to claim 2 wherein said at least one memory unit comprises a first memory unit coupled to said central processing unit for storing at least one first program for processing signals received from said local control units and for generating control signals in said central processing unit, and a second memory unit coupled to said subprocessor for storing at least one second program for controlling communications between said integrated communications apparatus and local control units of said vehicle systems.

4. The integrated communications apparatus according to claim 3 wherein said second memory unit comprises an EPROM or an E² PROM.

5. The integrated communications apparatus according to claim 4, further comprising an input/output circuit coupled to said central processing unit and said subprocessor.

6. The integrated communications apparatus according to claim 1 wherein said subprocessor comprises:

first shift register coupled to receive input signals transmitted from said local control units by means of said data communication line;

a receiving register coupled to receive said input signals from said shift register and having an output coupled in communication with said central processing unit;

a transmission register coupled to receive control signals output by said central processing unit; and

a second shift register coupled to receive said control signals from said transmission register and to transmit them to said local control units by means of said data communication line;

said first and second shift registers being controlled in response to at least one data communication processing program stored in said at least one memory unit.

7. The integrated communications apparatus according to claim 6 wherein said at least one memory unit has stored therein a plurality of data communication processing programs for controlling communication between said integrated communications apparatus and local control units of said vehicle systems according to a plurality of data communication protocols.

8. The integrated communications apparatus according to claim 7 wherein said at least one memory unit has stored therein a program which controls operation of said data communication processing programs according to a predetermined sequence.

9. The integrated communications apparatus according to claim 8 wherein said plurality of data communication protocols comprises at least a first protocol for transferring signals at a first speed, a second protocol for transferring signals at a second speed and a third protocol for transferring information at a third speed.

10. The integrated communications apparatus according to claim 9 wherein said first speed is a relatively slow speed, said second speed is greater than said first speed, and said third speed is greater than said second speed.

11. The integrated communications apparatus according to claim 10 wherein said predetermined sequence provides for operation of said protocol having said third speed at a repetition rate that is greater than that of said protocols having said second and first speeds and for operation of said protocol having said second speed at a repetition rate that is greater than that of said protocol having said first speed.

12. The integrated communications apparatus according to claim 11 wherein said predetermined pattern provides for operation of said protocols in the following sequence:

third speed

second speed

third speed

first speed

third speed

second speed

third speed

pause,

which sequence is then repeated.

13. The integrated communications apparatus according to claim 1 wherein said at least one memory unit has stored therein a plurality of data communication processing programs for controlling communication between said integrated communications apparatus and local control units of said vehicle systems according to a plurality of data communication protocols.

14. The integrated communications apparatus according to claim 13 wherein each of said data communication protocols has a different data communication speed.

15. The integrated communications apparatus according to claim 13 wherein said at least one memory unit has stored therein a program which controls operation of said data communication processing programs according to a predetermined sequence.

16. The integrated communications apparatus according to claim 13 wherein said plurality of data communication protocols comprises at least a first protocol for transferring signals at a first speed, a second protocol for transferring signals at a second speed and a third protocol for transferring information at a third speed.

17. The integrated communications apparatus according to claim 1 wherein said plurality of vehicle systems includes a display control unit and at least one system for controlling vehicle body rigging, said apparatus further comprising:

a dedicated transmission integrated circuit coupled to an output of said subprocessor, and having first and second sets of analog drivers and analog receivers;

a first data transmission line connecting said first set of analog driver and analog receiver to said display control unit;

a second data transmission line connecting said second set of analog driver and analog receiver to said at least one system for controlling vehicle body rigging;

wherein said subprocessor executes substantially identical communications processing programs in parallel for controlling communications between said integrated communications apparatus and said display control unit and between said integrated communications apparatus and said at least one system for controlling body rigging, by means of said first and second data transmission lines.

18. The integrated communications apparatus according to claim 17 wherein said at least one system for controlling body rigging includes at least one of power windows, power locks, head lights, turn signals and power seats.

19. The integrated communications apparatus according to claim 17 wherein said display control unit receives and controls display of input signals from at least one of a television receiver and a navigation unit.

20. The integrated communications apparatus according to claim 19 wherein said display control unit controls operation of at least one air conditioner unit and an audio unit by means of a touch panel.

21. The integrated communication apparatus according to claim 1, wherein:

said at least one memory unit comprises at least a first memory unit and a second memory unit;

said control programs by which said central processing unit receives and processes signals transmitted from said local control units are stored in said first memory unit; and

said communication processing program by which said programmable subprocessor controls communications between said central processing unit and said local control units is stored in said second memory unit.

22. A method of monitoring and controlling operational status of a plurality of vehicle systems, each having a local control unit for controlling operation thereof, said local control units being accessible by means of a data communication line, said method comprising the steps of:

providing a microprocessor having a central processing unit and a dedicated programmable subprocessor external to said central processing unit;

operating said central processing unit to process signals transmitted from said local control units indicative of operational status of said plurality of vehicle systems, and to generate control signals for transmission to said plurality of vehicle systems, according to control programs stored in a memory; and

operating said subprocessor to control communications between said central processing unit and said local control units according to at least one data communication processing program stored in a memory.

23. The method according to claim 22 wherein said at least one data communication processing program may be configured and reconfigured to control communication between said central processing unit and said vehicle systems according to at least one communications protocol which is compatible with said vehicle systems.

24. The method according to claim 23 wherein said plurality of vehicle systems communicate according to a plurality of differing communications protocols and wherein said at least one data communication processing program comprises a plurality of programs, including at least one program which is compatible respectively with each of said communications protocols.

25. The method according to claim 24 wherein said step of operating said subprocessor comprises operating said programs according to a predetermined operating sequence.

26. The method according to claim 25 wherein said predetermined operating sequence can be modified by reprogramming said subprocessor.

27. The method according to claim 25 wherein said predetermined operating sequences provides for operation of said programs in the following sequence:

third speed

second speed

third speed

first speed

third speed

second speed

third speed

pause,

which sequence is then repeated.

28. An integrated communication apparatus for a vehicle control, said apparatus comprising:

an engine control unit for determining and sending a value for at least one of a plurality of control variables, said plurality of control variables including at least a fuel injection amount and ignition timing, and for controlling at least one system of a vehicle engine;

a transmission control unit for automatically controlling a vehicle transmission;

local control units for controlling vehicle body installations;

a transmission line for transmitting signals among said control units;

a plurality of sensors and actuators connected to said control units via said transmission line; and

a transmission input and output device for controlling communication among said control units, sensors and actuators;

wherein transmission of signals for said engine and transmission control units is executed at a faster rate than transmission of signals for said local control units.

29. The intergrated communications apparatus according to claim 28 wherein said transmission input and output device is installed in at least one of said local control units.

30. The integrated communication apparatus according to claim 28, further comprising a diagnosis unit for diagnosing at least one of said control units, wherein:

said transmission input and output device controls communication among said diagnosis and control units, sensors and actuators; and

said transmission of signals for said engine and transmission control units is executed at a faster rate than transmission of signals for said diagnosis unit, and transmission of signals for said diagnosis unit is executed at a faster rate than said transmission of signals for said local control units.

31. An integrated communication apparatus for a vehicle control, said apparatus comprising:

local control units for controlling vehicle body installations;

a display control unit for controlling a display device installed in a vehicle; and

a transmission line which constantly connects said control units with each other;

wherein control states of said vehicle body installations controlled by said local control units are sent to said display control device and displayed on said display device.

32. An integrated communication apparatus for a vehicle control, said apparatus comprising:

a plurality of control units, including control units having a microcomputer and control units having no microcomputer, wherein signal sending and receiving for said control units having no microcomputer is controlled by at least one of said control units having a microcomputer; and

a transmission input and output device for controlling signal transmission for said control units which have a microcomputer at a faster rate than signal transmission for said control unit which have no microcomputer.

33. The integrated communication apparatus according to claim 32 wherein at least one of said control units which have a microcomputer includes a main microcomputer for calculating control signals for said control units which have no microcomputer, and a subprocessor for executing operations of said transmission input and output device.

34. A vehicle integrated siring system having a communication control unit comprising:

a main processor for processing data communicated between said communication control unit and other elements provided in a vehicle via a bus to which said other elements are connected;

at least one memory for storing data processing procedures and communication procedures; and

a dedicated programmable subprocessor for executing communication between said communication control unit and said other elements according to at least one of said processing procedures stored in said at least one memory device.

35. A communication control unit for a vehicle integrated wiring system, said communication control unit comprising:

a main processor for processing data communicated between said communication control unit and other elements provided in a vehicle via a bus to which said other elements are connected;

at least one memory for storing data processing procedures and communication procedures; and

a dedicated programmable subprocessor for executing communication between said communication control unit and said other elements according to at least one of said processing procedures stored in said at least one memory device.