Automotive Hydraulic Brake System
AssigneeHitachi Automotive Systems, Ltd.
InventorToshiya OOSAWA
Life of this patent
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Abstract
An automotive hydraulic brake system is provided which exhibits an excellent pressure reduction performance to a low μ road while restraining an intake resistance of a fluid pump. For providing the hydraulic brake system, a gate-in valve is connected to an intake passage that connects a master cylinder to an intake side of the fluid pump. The gate-in valve selectively opens and closes the intake passage in accordance with a mutual relation between a master cylinder pressure and a pressure produced at an intake side of the fluid pump.
Claims22
A hydraulic brake system comprising:
- an intake passage connecting a master cylinder to an intake side of a fluid pump;
- a discharge passage connecting a discharge side of the fluid pump to the master cylinder;
- a first passage branched from the discharge passage and connected to a wheel cylinder;
- a pressure reduction passage connected to a reservoir that reserves a pressure reduced brake fluid from the wheel cylinder;
- an outlet passage connecting the reservoir to the intake passage;
- and
- a gate-in valve that selectively opens and closes the intake passage in accordance with both a master cylinder pressure produced by the master cylinder and a pump intake side pressure produced in an intake side of the fluid pump.
A hydraulic brake system comprising:
- a fluid pump driven by an electric motor;
- and
- a housing that houses therein the fluid pump;
- wherein the housing comprises:
- a master cylinder port to be connected to a master cylinder that is arranged outside the housing;
- an intake passage connecting the master cylinder port to an intake side of the fluid pump;
- a discharge passage connecting a discharge side of the fluid pump to the master cylinder port;
- a first passage branched from the discharge passage;
- a wheel cylinder port connecting the first passage to a wheel cylinder that is arranged outside of the housing;
- a pressure reduction passage through which a brake fluid in the wheel cylinder is led into a reservoir through the wheel cylinder port;
- and
- an outlet passage connecting the reservoir to the intake passage, and
- wherein the intake passage is provided with a pressure valve that selectively opens and closes the intake passage in accordance with a pressure difference between pressures respectively appearing at upstream and downstream portions of the intake passage with respect to the pressure valve.
A hydraulic brake system comprising:
- a housing therein a fluid pump;
- an intake passage connecting an outside portion of the housing to an intake side of the fluid pump;
- a discharge passage connecting a discharge side of the fluid pump to the outside portion of the housing;
- a first passage branched from the discharge passage and connected to a wheel cylinder that is positioned outside the housing;
- a pressure reduction passage through which a brake fluid in the wheel cylinder is led into a reservoir;
- an outlet passage connecting the reservoir to the intake passage;
- and
- a gate-in valve provided by the intake passage, the gate-in valve selectively opening and closing the intake passage in accordance with a pressure difference between pressures respectively appearing at upstream and downstream portions of the intake passage with respect to the gate-in valve,
- wherein the fluid pump is arranged to suck the brake fluid through the gate-in valve from the outside portion of the housing.
Dependencies are inferred from the claim text.