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    • 6. 发明专利
    • CONTROL METHOD AND DEVICE FOR VEHICLE BRAKE DEVICE
    • JPH11139278A
    • 1999-05-25
    • JP24831298
    • 1998-09-02
    • BOSCH GMBH ROBERT
    • FAYE IANWISS HELMUT
    • B60T7/12B60T8/32B60W30/00G08G1/16
    • PROBLEM TO BE SOLVED: To surely detect a degree of risk to operate a brake auxiliary device in an early period when the risk is expected, by regarding at least one driving variable as a variable derived from the distance to an obstacle or the like ahead of a vehicle. SOLUTION: A relative speed Vrel of an obstacle ahead of a vehicle is read (100), and a threshold value (dPVOR/dt)0 to the change of supply pressure is selected on the basis of the relative speed Vrel (102). Then the change of supply pressure dPVOR/dt is calculated (104), and a pump and a valve of a hydraulic brake device are operated when a value of the change is over the threshold value (106) to start the rise of the brake pressure independently from a driver (108). Whether the rise of the pressure is finished or not is judged (110), the brake device is operated to lower the additional brake pressure again when the rise of the pressure is finished, and the braking force set by the driver is added to a wheel brake. Whereby the possibility of the start of the automatic braking process in an undesired state, can be prevented.