Hitachi Automotive Systems, Ltd.

Hiroki Sonoda

Toshiya Oosawa

Asahi Watanabe

Chiharu Nakazawa

Ryohei Maruo

Akira Takahashi

Motohiro Higuma

Masayuki Saito

Hideaki Yagashira

Toshiya Osawa

A system comprises: pump (hydraulic pressure source) that uses brake fluid supplied from reservoir tank (reservoir) to generate hydraulic pressure in first hydraulic line, thereby generating hydraulic pressure in wheel cylinder; piston configured to move axially in cylinder under the action of hydraulic fluid supplied from master cylinder, piston dividing cylinder into at least two chambers (positive pressure chamber and backpressure chamber); stroke simulator for generating reaction force to a driver's brake operation by moving piston; second hydraulic line provided between positive pressure chamber in stroke simulator and master cylinder; and third hydraulic chamber provided between backpressure chamber and first hydraulic chamber to transmit brake fluid from backpressure chamber to first hydraulic chamber.

Brake control system, brake system, and brake hydraulic pressure generating method

The present invention provides a brake device that can improve the pressure-increasing response of wheel cylinder hydraulic pressure. The invention is provided with: a master cylinder () actuated by the driver operating the brake, the master cylinder () being connected to a wheel cylinder () via a first oil channel (), and capable of increasing the wheel cylinder hydraulic pressure; and an auxiliary pressure-increasing part (auxiliary pressure-increasing part () and stroke simulator ()) for assisting in the increasing of the wheel cylinder hydraulic pressure by the master cylinder () of the pump ().

Brake device

There is provided a brake apparatus configured to identify a fluid leak spot while generating a braking force. The brake apparatus is configured to drive pumpto supply a brake fluid to a first fluid passage (fluid passageP, discharge passageP) and a second fluid passage (fluid passageS, discharge passageS), switch communicating valvesP andS alternately between open and closed positions more than once, and detect a brake-fluid leakage in the first or second fluid passage on the basis of magnitudes of detection values detected by hydraulic-pressure sensorsP andS during the open-close switching.

Brake apparatus

In a vehicle control apparatus employing a first speed self-adjustment control system configured to control a speed of a host vehicle based on a first command value, in a manner so as to maintain a distance of the host vehicle from a preceding vehicle or to maintain a set speed, a second speed self-adjustment control system is provided for controlling the host vehicle's speed based on a second command value determined based on information about a lateral acceleration acting on the host vehicle. Also provided is a deceleration selector configured to select either one of the first and second command values, which selected command value produces a greater deceleration exerted on the host vehicle. A control unit is configured to control the host vehicle's speed by driving an actuator based on the selected command value.

Vehicle control apparatus

[OBJECT] To provide a brake control apparatus and method for controlling the brake which is capable of preventing a fluctuation of a brake pedal stroke amount when switching a regenerative braking force to a hydraulic braking force. [MEANS TO SOLVE] A brake control apparatus has a stroke simulatorinto which a brake fluid that flows out of a master cylinder M/C by driver's braking operation is able to flow; a pipewhich connects the stroke simulatorand the master cylinder M/C; a gate-in valvewhich is set on the pipeand opens/closes the pipe; a pump P which pumps up the brake fluid flowing into the stroke simulatorfrom the master cylinder M/C and can increase a pressure of a wheel cylinder W/C that is provided for each wheel; an HUwhich increases the wheel cylinder pressure by the brake fluid flowing into the stroke simulatorand pumped up by the pump P, together with at least the gate-in valve; and a regenerative brake unit which is provided separately from the HUand produces a regenerative braking force for the wheel.

Brake control apparatus and method for controlling the brake

A vehicle control system includes: an inter-vehicle distance control section configured to perform a follow-up control to a preceding vehicle by automatically accelerating or decelerating a host vehicle, or a constant speed running control section configured to perform a constant speed running to converge to a set speed; a brake operating state sensing device; and a control unit including; a deceleration control section configured to perform a deceleration in accordance with the brake operating state of the driver when the brake operating state sensing device senses the brake operation of the driver during the inter-vehicle distance control or the constant speed running control; and an acceleration control limit section configured to cancel a control in the acceleration direction which is performed by the inter-vehicle distance control or the constant speed control when the brake operating state sensing device senses an end of the brake operation of the driver.

Growing community of inventors

Atsugi, Japan

Hiroki Sonoda