Negative pressure control apparatus for brake booster
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYoshihisa Yamada, Hiroaki Endo, Ryochi Watanabe
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Abstract
A negative pressure control apparatus for a brake booster is provided which can always maintain a required negative pressure in a negative pressure chamber of the brake booster in a system including a direct-injection engine. The apparatus has a brake operation predicting part for predicting execution of a brake operation by a driver. When execution of a brake operation is predicted, negative pressure in the negative pressure chamber is controlled to be a required value.
Claims11
A negative pressure control apparatus for a brake booster in a vehicle for controlling negative pressure in a negative pressure chamber of the brake booster connected to an intake pipe of a direct-injection engine at a position downstream of a valve in the intake pipe, comprising:
- a brake operation predicting part for predicting execution of a brake operation by a driver;
- and
- a booster negative pressure controller for controlling the negative pressure in said negative pressure chamber to be a required value when execution of a brake operation is predicted under a condition in which the negative pressure is smaller than a predetermined value.
Dependencies are inferred from the claim text.