Automotive vehicle control system

• US 4,910,494 A
• Filed: 03/28/1989
• Issued: 03/20/1990
• Est. Priority Date: 06/19/1986
• Status: Expired due to Term

• Current Assignee: Isuzu Motors Limited
• Original Assignee: Isuzu Motors Limited
• Inventors: Tamai, Hidefumi
• Primary Examiner(s): Orsino, Joseph A.
• Assistant Examiner(s): Hofsass, Jeffery A.
• Application Number:
  US07/331,080
• Time in Patent Office: 357 Days
• Field of Search: 340/52 R, 340/52 F, 340/438, 371/9, 371/11, 371/68, 307/10 R, 364/431.11, 123/479, 318/564
• US Class Current: 340/438
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: F02D 41/266 the computer being backed-up or assisted by another circuit, e.g. analogue
• CPC Class Codes: F16H 2061/1208 with diagnostic check cycles; Monitoring of failures
• CPC Class Codes: F16H 2061/122 Avoiding failures by using redundant parts
• CPC Class Codes: F16H 2061/124 Limiting the input power, torque or speed
• CPC Class Codes: F16H 2061/1268 Electric parts of the controller, e.g. a defect solenoid, wiring or microprocessor
• CPC Class Codes: F16H 61/12 Detecting malfunction or potential malfunction, e.g. fail safe in control of hydrostatic gearing F16H61/4192; Circumventing or fixing failures
• CPC Class Codes: F16H 63/40 comprising signals other than signals for actuating the final output mechanisms
• CPC Class Codes: G05B 9/03 with multiple-channel loop, i.e. redundant control systems

Abstract

An automotive vehicle control system is equipped with a main electronic control unit for controlling devices mounted on the vehicle, and an emergency electronic control unit for backing up the main electronic control unit. Both electronic control units transmit diagnostic signals, receive the diagnostic signals from each other and diagnose them for abnormalities, whereby a fault in the main electronic control unit is diagnosed by the emergency electronic control unit and a fault in the emergency electronic control unit is diagnosed by the main electronic control unit.

Claims

1. An automotive vehicle control system having an electronic control unit for controlling an engine, clutch, and transmission of an automotive vehicle, said system comprising:

normal and emergency fuel control actuators connected to the engine and controlling a flow of fuel to the engine;

normal and emergency clutch control actuators connected to and controlling the clutch;

normal and emergency transmission control actuators connected to and controlling the transmission;

a main electronic control unit connected to and controlling said normal control actuators;

an emergency electronic control unit connected to and controlling said emergency control actuators;

fault detecting means for detecting faults in said main electronic control unit and said emergency electronic control unit;

alarm means for emitting an alarm when a fault is detected by said fault detecting means; and

power supply changeover means for switching off electric power to said main electronic control unit while simultaneously switching power on to said emergency electronic control unit when a fault is detected in said main electronic control unit by said fault detecting means.

2. An automotive vehicle control system according to claim 1, wherein said emergency electronic control unit comprises means for controlling said emergency fuel control actuator to idle the engine when a fault is detected in said main electronic control unit by said fault detecting means.

3. An automotive vehicle control system according to claim 1, further comprising emergency gear selecting means for generating signals to manually select gears of said transmission through said emergency transmission control actuator when a fault is detected in said main electronic control unit by said fault detecting means.

4. An automotive vehicle control system according to claim 3, wherein said emergency electronic control unit comprises means for controlling said emergency transmission control actuator in response to receiving the signals generated by said emergency gear selecting means.