Patent ID: 6532411
Filing Date: 2003-03-11
Classification: B60T

Abstract:
A brake booster control device provided with at least a function of outputting an amplified output based on an input from a brake pedal and a control function which increases or decreases the amplified output by acting an electromagnetic force to a control valve, characterized in that the brake booster control device further comprises a function of judging that a driver has pressed the brake pedal based on at least one of when an output larger by a predetermined amount than an output which is expected from a control amount applied to the control valve is obtained, when an output larger by a predetermined amount than a control target output is obtained and when an output variation larger in its increasing direction by a predetermined amount than a variation component of a control target output is obtained, wherein the output expected from the control amount applied to the control valve is calculated, based on different characteristic values including hysteresis characteristic depending on output increasing period and output decreasing period and it is judged that the driver has pressed the brake pedal when a value determined by adding a predetermined value to the calculated value exceeds the actual output.