Control device for use in vehicle, adapted to control safety measures against electric power supply failure

Abstract

A 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.

Description

technical field [0001] The present invention relates to a control device for safety countermeasures when power supply of a vehicle fails, which is used to enable parking lock of vehicles such as electric vehicles, such as electric vehicles and hybrid vehicles, which use at least a part of the power source of electric motors, such as electric vehicles, even when the power supply fails. Device security action. Background technique [0002] In a car equipped with a manual transmission, the vehicle is usually parked with the transmission at a low speed such as 1st speed, and the rotation of the driving wheels is locked. , the vehicle will not move. [0003] However, in an electric vehicle and a vehicle equipped with an automatic transmission, it is not possible to lock the rotation of the driving wheels during parking by the above-mentioned method like a vehicle equipped with a manual transmission. Therefore, a parking lock for locking the rotation of the driving wheels is prov...

AI Technical Summary

Problems solved by technology

[0014] However, when two parking lock power supplies are provided and the parking lock power supply system is set as two systems, it is true that even if one of the parking lock power supply systems fails, the other parking lock power supply system, It is also possible to operate the parking lock device, but the parking lock power supply itself is expensive, and there is a problem of high cost compared to it.

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