| 摘要 |
A unified control device for a vehicle including an anti-skid braking system and power steering control system is controlled by two microcomputers (4B and 24B). On the basis of the outputs of the torque sensors (1a and 1b, etc.), the first microcomputer (4B) determines the driving direction and torque of the DC motor (9) providing the assisting steering torque for the steering wheel, and outputs the torque signal (T) and the first direction signal (D1) for the DC motor (9). The second microcomputer (24B) generates the brake operation signal (B) on the basis of the outputs of the road wheel velocity sensors (21a through 21d) and the brake switch (22). Further, on the basis of the output of the torque sensors (1a and 1b), the microcomputer (24B) determines the direction of the DC motor (9), and outputs the second direction signal (D2). The motor drive circuit (8) drives the DC motor (9) in accordance with the torque signal (T) and the direction command signal (D), which is output from the AND circuit (40) only when the first and second direction signals (D1 and D2) coincide. Further, the microcomputers (4B and 24B) output first and second fail-safe relay energization signals (F1 and F2), respectively, when the power steering control system and the anti-skid braking system are judged to be operating normally. The power supply control circuit (42) immediately opens the fail-safe relay unit (6B) when neither the first and second signals (F1 and F2) are supplied. However, in the case where only one of the first and second signals (F1 and F2) are supplied, the power supply control circuit (42) defers the interruption of the fail-safe relay unit (6B) until the vehicle stops.
|
