Honda Giken Kogyo Kabushiki Kaisha

Shouji Suzuki

Yoichi Sugimoto

Takahiro Eguchi

Hirotoshi Inoue

Toshiya Kanda

Shohei Matsuda

Satoshi Hada

Kazuaki Fukami

Masakazu Shiraishi

Tetsuro Yamaguchi

Masaru Sasaguchi

A brake fluid pressure retaining unit for retaining brake fluid pressure within a wheel cylinder after releasing a brake pedal is disclosed. The brake fluid pressure retaining unit includes a brake fluid pressure reduction speed control device for retaining reduction speed of the brake fluid pressure within the wheel cylinder less than that of brake pedal load applied by a driver. The brake fluid pressure reduction speed control device may be formed by a restriction in a brake fluid pressure circuit arranged between a master cylinder at which the brake fluid pressure is generated in accordance with a brake pedal load applied by the driver and the wheel.

Brake fluid pressure retaining unit

A brake fluid pressure retaining unit for a vehicle comprises a solenoid valve SV arranged in a brake fluid passage FP between a master cylinder MC and a wheel cylinder WC so as to shut off or communicate the brake fluid passage FP. In the case that a transmission of the vehicle is shifted to a driving position, the solenoid valve SV is switched to a shut-off position when the vehicle stops with a brake pedal BP depressed. The solenoid valve SV is switched to a communicating position when driving force is exerted on the vehicle. Brake fluid pressure is retained within the wheel cylinder WC when the solenoid valve SV is in the shut-off position. The brake fluid pressure within the wheel cylinder is retained after releasing the brake pedal so that braking force continues to act on the vehicle. The brake fluid pressure retaining unit comprises control means CU such that when the solenoid valve is in the shut-off position and the transmission is shifted to a non-driving position, the solenoid valve SV is returned to the communicating position on condition that depression of the brake pedal BP is released.

A braking force control unit, which allows transmission of driving force from a motor to driving wheels irrespective of releasing an accelerator pedal under or equal to a certain vehicle speed when a transmission is selected to a driving range, and switches said driving force to be transmitted to the driving wheels between a strong condition and a weak condition in accordance with depression of a brake pedal such that when the brake pedal is depressed, said driving force is controlled to be less than the driving force upon releasing the brake pedal, wherein the braking force control unit comprises means for retaining braking force so as to continuously retain the braking force after releasing the brake pedal, and said means releases the braking force after releasing the brake pedal and in the process of increasing the driving force to the strong condition.

Braking force control unit

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Saitama, Japan

Shouji Suzuki