CONTROL DEVICE FOR USE IN VEHICLE, ADAPTED TO CONTROL SAFETY MEASURES AGAINST ELECTRIC POWER SUPPLY FAILURE

摘要

A control device for use in a vehicle, the control device being adapted to control safety measures against an electric power supply failure. The control device is configured so that, in a first phase in which the voltage is higher than or equal to 10.5 V, even if the vehicle has an electric power supply failure in which electricity charging is not possible, the braking force is assisted normally and the vehicle can be stopped safely in such a manner that the speed of the vehicle is limited to an upper limit speed corresponding to the voltage, the upper limit speed being that which enables the vehicle to be stopped as usual by the assistance. The control device is configured also so that, in second to fourth phases in which the voltage is lower than 10.5 V, the vehicle is stopped by forcibly reducing, for safety, the speed of the vehicle by drive force cut-off by which the drive force is reduced to zero. In the fourth phase in which the voltage drops to a level to immediately before a level at which the parking lock device cannot be activated, the speed of the vehicle is almost zero, and a parking lock mechanism is operated to set wheels to a parking lock state. This means that the parking lock has been completed when the voltage drops to the level at which the parking lock cannot be activated, and as a result, the situation where the vehicle cannot be parked due to a power supply failure can be prevented.