Integrated wiring system

• US 5,467,272 A
• Filed: 01/21/1994
• Issued: 11/14/1995
• Est. Priority Date: 01/21/1993
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yoshida, Tatsuya, Oho, Shigeru
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): Wieland, Susan
• Application Number:
  US08/184,443
• Time in Patent Office: 662 Days
• Field of Search: 364/424.01, 364/424.03, 364/424.1, 364/431.04, 364/431.07, 364/514, 340/825.02, 340/825.06, 340/825.07, 340/825.52, 370/91, 370/95.3, 370/84, 395/200
• 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: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 2310/46 for ICE-powered road vehicles
• CPC Class Codes: H04L 12/40013 Details regarding a bus controller
• CPC Class Codes: H04L 12/4013 Management of data rate on the bus systems modifying transmission characteristics according to link quality H04L1/0001
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

An integrated wiring system having a plurality of terminal control units and a central controlling unit (including computational processing means) for transferring information to and from the terminal control units. An input/output control unit is provided for executing communication control based on plural communication protocols with a plurality of different information processing speeds for communicating with the terminal control units. In a preferred embodiment, the input/output control units have a plurality of transmission controlling programs corresponding to the plurality of terminal control units, and the frequencies of execution of the respective terminal controlling programs are different from one another.

Claims

1. Integrated communications apparatus for a vehicle control system having a computational processor for receiving and processing signals indicative of operational status of a plurality of vehicle systems and for controlling said vehicle systems, said apparatus comprising:

a plurality of terminal control units for operating said vehicle systems;

a central control unit having an input-output subprocessor for transferring electronic signals between said computational processor and said terminal control units;

said input-output subprocessor having a plurality of communications interface units for communicating with said terminal control units according to a plurality of communications protocols, each of said communications interface units having a different communications protocol for communicating with particular vehicle systems at a speed which is different from that of others of said communications interface units; and

means for alternating operation of said communications interface units according to a predetermined pattern.

2. Apparatus accordingly to claim 1 wherein said plurality of protocols comprise 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.

3. Apparatus according to claim 2 wherein said first speed is a relatively slower speed, said second speed is greater than said first speed, and said third speed is greater than said second speed.

4. Apparatus according to claim 3 wherein said means for alternating operation comprises a read only memory having said predetermined pattern stored therein.

5. Apparatus according to claim 4 wherein said predetermined pattern 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.

6. Apparatus according to claim 4 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.

7. Apparatus according to claim 6 wherein said input-output subprocessor comprises a single communications IC having said plurality of communications interface units included therein.

8. Apparatus according to claim 1 wherein said input-output subprocessor comprises a single communications IC having said plurality of communications interface units included therein.

9. Apparatus according to claim 1 wherein each of a first group of said sensors which communicates at said third speed has a communications IC, and each of said terminal control units associated with said first group of sensors has a computing unit which has a communications interface unit which communicates at said third speed.

10. Method of operating an integrated communications apparatus for a vehicle control system having a computational processor for controlling a plurality of vehicle systems, a plurality of terminal control units for operating said vehicle systems, a plurality of sensors for monitoring operation of said vehicle systems and providing output signals indicative of operational status thereof, and a central control unit having an input-output subprocessor for transferring electronic signals between said computational processor and said sensors and terminal control units, said method comprising the steps of:

providing said input-output subprocessor with a plurality of communications protocols, each of which operates at a speed which is different than a speed of others of said plurality of communication protocols, for communicating with vehicle systems which require different control speeds; and

alternating operation of said communications protocols according to a predetermined pattern.

11. Method according to claim 10 wherein a first protocol operates at a first speed which is relatively slower than that of said second and third protocol, a second protocol operates at a second speed which is greater than that of said first protocol and a third protocol operates at a third speed which is greater than that of said first and second protocols, and wherein said predetermined pattern provides for operation of said protocol having said third speed at a repetition rate that is greater than that of said protocol 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. Method 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. Method of operating an integrated communications apparatus for a vehicle control system having a central control unit for controlling a plurality of classes of vehicle systems, each class requiring communication with said central control unit at a speed which is different from that of other classes of said plurality of classes;

said method of comprising the steps of;

sequentially operating said central control unit to transmit and receive electronic signals to and from said vehicle systems at each speed required for communication with said plurality of classes of vehicle systems; and

controlling said sequence of operating according to a predetermined pattern.

14. Method according to claim 13 wherein said predetermined pattern provides for transmission of signals most frequently at a highest speed and less frequently at lower speeds, with the repetition rate for operation at each speed being proportional to said speed.

15. Method according to claim 14 wherein at least a first class of vehicle systems requires communication at a highest speed, a second class of vehicle systems requires communication at an intermediate speed and a third class of vehicle systems requires communication of at a slowest speed, and wherein said predetermined pattern provides for communication according to the following sequence:

highest speed

intermediate speed

highest speed

slowest speed

highest speed

intermediate speed

highest speed

pause,

which sequence is then repeated.

16. Method according to claim 13 wherein at least a first class of vehicle systems requires communication at a highest speed, a second class of vehicle systems requires communication at an intermediate speed and a third class of vehicle systems requires communication of at a slowest speed, and wherein said predetermined pattern provides for communication according to the following sequence:

highest speed

intermediate speed

highest speed

slowest speed

highest speed

intermediate speed

highest speed

pause,

which sequence is then repeated.