Automobile integrated wiring system

• US 5,404,300 A
• Filed: 02/04/1994
• Issued: 04/04/1995
• Est. Priority Date: 03/08/1990
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sugiura, Kazumasa
• Primary Examiner(s): Trans, Vincent N.
• Application Number:
  US08/191,725
• Time in Patent Office: 424 Days
• Field of Search: 364/424.05, 364/424.01, 307/40, 307/41, 307/38, 307/39, 371/22, 371/67.1, 371/68.1, 371/68.2, 370/67
• US Class Current: 701/49
• 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

An automobile integrated wiring system has a central control unit adapted to act upon operator control instructions. The central control unit is arranged to provide output signals over a transmission path to a plurality of controllable peripheral devices each of the peripheral devices being arranged to perform a control function of the automobile. At least one of the peripheral devices includes detecting means for detecting an abnormality in the central control unit and means adapted to accept operator control instructions over the transmission path when the central control unit is detected to have an abnormality so that an appliance associated with the peripheral device may be operated by said peripheral device in the absence of instruction from the central control unit.

Claims

1. In an automobile integrated wiring system having a central control unit provided with means for data transmission control adapted to act upon operator control instructions and to provide output signals indicative thereof over a transmission path to a plurality of peripheral device means, each of which is adapted to perform a control function of the automobile, the improvement wherein at least one of the peripheral devices includes detecting means for detecting an abnormality in said central control unit, back-up control means at least partially corresponding to said data transmission control means of said central control unit so as to assume data transmission control upon detection of occurrence of an abnormality in said central control unit thereby to secure data transmission over the transmission path thereof, means adapted to accept operator control instructions over said transmission path when said central control unit is detected to have an abnormality, means for performing data exchange with other said peripheral device means, computing means for calculating data required to be output by said other said peripheral device means for those said other said peripheral device means to perform their control functions, and transmitting means for transmitting the result of said calculation by said computing means to said other peripheral means whereby said control function is maintained.

2. A system as claimed in claim 1 wherein said peripheral device means includes a microcomputer device adapted to determine abnormality in said central control unit and to thereupon actuate an automobile appliance.

3. A system as claimed in claim 2 wherein said appliance is one of a headlamp, a rear lamp, a brake stop lamp, a turn indicator lamp, a turn indicator switch, a door lock, a window movement actuator, a window washer pump, a wiper actuator, an external mirror actuator, an air-condition actuator, a seat actuator, a navigation system.

4. A system as claimed in claim 1 wherein said central control unit includes means for outputting a pulse pattern and said peripheral device means includes detector means for analysing said pulse pattern and for determining if said pattern is interrupted in excess of a predetermined time whereby if said detector means determines an interruption exists, an abnormality in said central control unit is solved and said peripheral device means directly accepts instructions from said operator for controlling said appliance associated therewith.

5. A system as claimed in claim 1 wherein said peripheral device means includes a microcomputer device adapted to determine abnormality in said central control unit and to control other peripheral device means.

6. An automobile integrated wiring system having a central control unit provided with means for data transmission control adapted to act upon operator control instructions and to provide output signals indicative thereof over a transmission path to a plurality of peripheral device means, each of which is adapted to perform a control function of the automobile, at least one of the peripheral devices including:

(a) detecting means for detecting an abnormality in said central control unit,

(b) memory means which stores a data transmission control program whereby transmission and reception of control data between respective peripheral device means is executed,

(c) back-up control means at least partially corresponding to said data transmission control means of said central control unit so as to assume data transmission control upon detection of occurrence of an abnormality in said central control unit, thereby to secure data transmission over the transmission path thereof,

(d) means accepting operator control instructions over said transmission path when said central control unit is detected to have an abnormality,

(e) means performing data exchange with other said peripheral device means,

(f) computing means calculating data required to be output by said other peripheral device means for said other peripheral device means to perform their control functions, and

(g) transmitting means transmitting the result of said calculation by said computing means to said other peripheral means whereupon said at least one peripheral device means executes the transmission control program to said other peripheral device means in accordance with said stored transmission control program instead of said control being effected by said central control unit so that said operator control function is performed via said at least one peripheral device means.

7. A system as claimed in claim 6 wherein judging means are provided for judging if the abnormality detected by said detecting means is the first time said abnormality is detected and if it is then the memory means is triggered to execute said data transmission control program.