A brake system includes a main brake cylinder and a pedal decoupling unit provided with a holding piston, the first ring surface thereof together with a first primary brake cylinder piston defining a first hydraulic chamber that is hydraulically pressurized with an electrically controllable pressure supply device. In order to improve the pedal characteristics of the brake system, in particular in a brake-by-wire brake system, the holding piston is embodied as a differential piston, the second ring surface thereof defining a second, blockable hydraulic chamber, and a piston effect in the second chamber corresponds to a force that acts counter to the direction of actuation on the holding piston.

Brake system for motor vehicles

PROBLEM TO BE SOLVED: To provide a brake control device for a vehicle capable of shortening a setting time of an operation characteristic of an electromagnetic valve.SOLUTION: The brake control device for a vehicle is applied to a brake control device including an electromagnetic valve 531 for controlling flow of brake fluid between a master cylinder and a wheel cylinder. The brake control device includes: valve opening power acquisition means 6(61) for acquiring valve opening power being input power when the electromagnetic valve is opened while changing the input power to a valve opening side as time passes after changing the input power so as to close the electromagnetic valve; and operation characteristic setting means 6(62) for setting an operation characteristic of the electromagnetic valve on the basis of the valve opening power acquired by the valve opening acquisition means. The valve opening power acquisition means 6(61) changes the input power to a valve closing side or the valve opening side of the electromagnetic valve by changing a rate in a unit time larger than that before the electromagnetic valve is opened in accordance with the acquisition of the valve opening power.

Brake control device for vehicle

In a vehicle brake control device, a target W/C pressure depending on an amount of operation performed to a brake operating member, exhibits hysteresis due to a forward mapping dataset and a backward mapping dataset. The vehicle brake control device selects the forward mapping dataset or the backward mapping dataset based on the amount of operation performed to the brake operating member, and determines a current value of a current to be supplied to one of first to fourth linear valves. Therefore, it is possible to prevent a wheel cylinder pressure from changing too sensitively to the operation to the brake operating member and from changing even when the driver is not intentionally operating the brake operating member. This makes the driver experience an improved brake feeling.

Vehicle brake control device

A vehicle brake system, including: a brake operation member (40) to be operated by a driver of a vehicle; a hydraulic brake device (32) provided for one of a front wheel (10F) and a rear wheel (10R) and configured to generate a hydraulic braking force in accordance with an operation of the brake operation member, the hydraulic braking force depending on a pressure of a working fluid; and an electric brake device (34) provided for the other of the front wheel and the rear wheel and configured to generate an electric braking force in accordance with the operation of the brake operation member, the electric braking force depending on a motion of an electric motor (114).

Vehicle brake system

In braking force control method for an automotive vehicle and braking force control apparatus therefor, contribution degrees of both of a stroke quantity of a brake input device and a master cylinder pressure developed in a master cylinder are set in accordance with at least one of the stroke quantity of the brake input device and the master cylinder pressure and the contribution degree of the master cylinder pressure on a calculation of a target braking force is set to become larger when an abrupt brake operation by a vehicle driver is detected (a control flag F is set to " 1 ") than the contribution degree of the master cylinder pressure when no abrupt brake operation by the vehicle driver is detected (control flag F is reset to " 0 ").

Braking force control method for automotive vehicle and braking force control apparatus therefore

A braking system for a vehicle, including a braking device which puts brake on a vehicle; an operating device which includes an operating member that is operated by a driver of the vehicle in a braking force increasing direction, that is, an operating direction in which a braking force of the braking device is increased or in a braking force decreasing direction, that is, an operating direction in which the braking force of the braking device is decreased; and a control device which decides a target control value for controlling the braking device based on an operation state amount of the operating member and which controls the braking device based on the decided target control value, wherein the control device includes an operating direction-dependant target control value deciding portion which sets an increasing direction target control value that is the target control value when the operating member is operated in the braking force increasing direction, and a decreasing direction target control value that is the target control value when the operating member is operated in the braking force decreasing direction to values different from each other at least in part of a control range.

Tetsuya Miyazaki

Papers

Braking system for vehicle