| 摘要 |
A fail-safe mechanism is provided with first and second control systems (A,B) controlling driving of an electrical system of a vehicle, and each including a driver circuit (2A,2B) connected with the electrical system of the vehicle, a CPU (1A,1B) controlling said driver circuit (2A,2B), a driving power source (4) feeding electric current to said driver circuit (2A,2B), a switch circuit (5A,5B) connected between said driving power source (4) and said driver circuit (2A,2B), and a CPU failure-detecting feature (3A,3B) connected between said switch circuit (5A,5B) and said driver circuit (2A,2B) and detecting an abnormal condition of said CPU (1A,1B) from an output signal sent from said CPU (1A,1B), wherein when said CPU of one said first and second control systems (A,B) outputs a failure signal during the operation of said one control system, said CPU failure-detecting feature of said one control system outputs an instruction for turning off to said switch circuit of said one control system, and said one control system sends a signal, representing the stopping of the feeding of electric current to said driver circuit, to said CPU of the other control system to allow said other control receiving the signal to start the driving-control.
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