| 摘要 |
PROBLEM TO BE SOLVED: To make adequate the vehicle deceleration shown as the total sum of an additional deceleration given by a deceleration adding control device when the deceleration will is shown by a driver, and the deceleration given by an engine brake. SOLUTION: When an acceleration return switch 404 is turned ON, and it is decided that a driver has a decelerating will, and when an object deceleration found depending on the car speed exceeds an engine brake deceleration found depending on the car speed and the shift step, the controller 301 of an acceleration adding control device leads in the atmospheric pressure to the control chamber 123 of a booster device 100, and after that, leads in a negative pressure to the control chamber 123 along the time according to the difference between the object deceleration and the engine brake deceleration, to deliver a necessary hydraulic pressure from a master cylinder 2, so as to generate an additional deceleration.
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