| 摘要 |
Provided is an electric booster capable of suppressing a fluctuation in pushing force on a brake pedal. The electric booster includes a first offset spring and a second offset spring, which have a non-linear characteristic increasing with an increase in advancing amount (amount of forward movement of a booster piston with respect to an input piston) as the booster piston of a master cylinder is moved in a pressure-intensifying direction. An electric actuator is controlled (advancement control is performed) so as to increase the advancing amount as the booster piston of the master cylinder is moved in the pressure-intensifying direction to perform a pressure reduction operation associated with regenerative cooperative control at the time of advancement control. Therefore, even when a pressure reduction associated with the regenerative cooperative control is performed at the time of a low hydraulic pressure or a high hydraulic pressure, a reaction force to the pedal can have the same value or approximately the same value before and after the pressure reduction. Specifically, the pressure reduction operation associated with the regenerative cooperative control can be realized without causing a great fluctuation in pushing force on the brake pedal at the time of the low hydraulic pressure or the high hydraulic pressure, and in turn, over a wide range of hydraulic pressure region.
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