When a brake ECU is started up rapidly by a brake pedal operation, the brake ECU executes a depression force fluid pressure mode. When the control pressure detected by a control pressure sensor becomes smaller than a switching determination threshold value, the brake ECU determines that an operation of returning a brake pedal is being performed, and switches the braking mode from the depression force fluid pressure mode to a normal control mode. Accordingly, even when the operation of a stroke simulator has been started, no uncomfortable feeling is given to a driver. Further, even when the operation of returning the brake pedal is not being performed, the braking mode is switched from the depression force fluid pressure mode to a simulator non-operation control fluid pressure mode when a vehicle starts to travel. Consequently, desired braking force can be rapidly generated.

Brake control device

A brake device for a vehicle is provided in which when a slave cylinder generates a brake fluid pressure that is commensurate with the actual amount of operation of a brake pedal by a driver in a state in which a master cut valve is closed and a fluid path connecting a master cylinder to the slave cylinder is cut off, a wheel cylinder is actuated by the brake fluid pressure. Since deterioration determination means determines a leak in the downstream of the slave cylinder based on the actual amount of actuation of the slave cylinder detected by a slave cylinder stroke sensor and the actual brake fluid pressure generated by the slave cylinder and detected by a fluid pressure sensor, it is possible to rapidly determine a leak in the downstream of the slave cylinder.

Brake device for vehicle

A brake control apparatus for controlling brakes of a vehicle having wheels, the apparatus including a stopped-state detecting portion which detects, based on a speed of at least one of the wheels detected by at least one wheel-speed sensor, a stopped state of the vehicle; an operation-force limiting portion which limits, based on a detection of the stopped state of the vehicle by the stopped-state detecting portion, an operation force of at least one of the brakes, such that an upper limit of the operation force is an intermediate level of an operation-force range used when the stopped state is not detected; a sensor ignoring portion which ignores, when an electric voltage supplied from a power source to the at least one wheel-speed sensor is not higher than a reference value, the at least one wheel-speed sensor; a limitation canceling portion which cancels, when the sensor ignoring portion ignores the at least one wheel-speed sensor, a limitation of the operation force by the operation-force limiting portion; and a rapid-change restraining portion which restrains a rapid change of the operation force caused by a cancellation of the limitation of the operation force by the limitation canceling portion.

Brake control apparatus

This control device for a vehicle switches a shift range of an automatic transmission through the use of an actuator, wherein the control device for a vehicle is characterized in being provided with a shift selection unit for receiving a shift position selection from a driver and a control unit for switching the shift range to a parking range through the use of an actuator when a vehicle power source turns off or when a drive power source stops, the control unit maintaining a neutral range, when the vehicle power source turns off or when the drive power source stops, until the elapse of a first prescribed time after the shift selection unit receives a neutral position selection while the vehicle power source is on or while the drive power source is driving.

Control device and control method for vehicle

PROBLEM TO BE SOLVED: To provide a brake control device for a vehicle that can improve a pedal feel.SOLUTION: An integrated control device 5, a brake control unit 2, and a motor control unit 4 are characterized in that a substitution control part which performs substitution control to increase fluid pressure braking torque by placing an actuator in operation while decreasing regenerative braking torque on the basis of a reference substitution vehicle speed line where a limit value of the regenerative braking torque corresponding to a preset vehicle speed is set executes pre-load regenerative braking torque decrease processing to decrease the regenerative braking torque before reference start timing at which regenerative braking torque determined by the reference substitution vehicle speed line is decreased during the execution of the substitution control. Consequently, operation timing of an actuator of a fluid pressure braking device A is quickened in the substitution control and a suction phenomenon of a brake pedal due to response delay is thereby suppressed to improve a pedal feel.

Brake control device for vehicle

PROBLEM TO BE SOLVED: To provide a vehicular braking system capable of suppressing fluctuation of the total braking torque when the braking torque applied to a wheel by a regenerative brake is shared by a hydraulic brake. SOLUTION: In a vehicular braking system to brake a vehicle through the cooperative control of a regenerative brake with a hydraulic brake, the tentative target hydraulic braking torque is determined based on the total required braking torque and the actual regenerative braking torque by S18-S22, the sharing gradient from the regenerative brake to the hydraulic brake is acquired based on the deceleration or the like of a vehicle body by S24, and the control delay correction is performed to the tentative target hydraulic braking torque by S26-S36 to determine the target hydraulic braking torque. In S38, the braking torque of the hydraulic brake is increased in a leading manner, and the hydraulic pressure follow-up regenerative control is performed, in which the regenerative braking torque is reduced while the total required braking torque is excessive thereby. COPYRIGHT: (C)2006,JPO&NCIPI

Vehicular braking system

PROBLEM TO BE SOLVED: To change the relationship between a stroke and reaction force, in case that a brake pedal is depressed and in case that returned. SOLUTION: A simulator control valve is provided in a simulator passage between a master cylinder and a stroke simulator, and a flow area of the simulator passage is controlled by controlling the simulator control valve. When a brake pedal is depressed, the flow area gets decreased, and when the brake pedal is returned, the flow area gets increased. Thereby the decreasing amount of the reaction force to increasing of the stroke is prevented from becoming excessive when the brake pedal is returned, and the operation feeling of a driver can be improved. In an electric control braking device, in case that brake working force is controlled on the basis of the stroke and master cylinder pressure, an increasing gradient of the master cylinder pressure to the stroke is decreased to improve the control performance of deceleration by the driver. COPYRIGHT: (C)2006,JPO&NCIPI

Brake operating device and vehicular braking device

PROBLEM TO BE SOLVED: To provide a braking control unit which can suppress variations in braking force, caused by a change in the weight of a vehicle, by accurately computing the weight of the vehicle, without newly providing a special device or a sensor. SOLUTION: This braking control unit of the vehicle controls a braking force, imparted to a wheel, by controlling brake fluid pressure in a wheel cylinder, depending on a driver's braking operation. The braking control unit comprises: an energy detecting means (block B21) for detecting energy output by a driving force source; a vehicle-speed variation detecting means (block B22) for detecting the variation of the speed of the vehicle; a first vehicle-weight computing means (block B23) for computing the weight of the vehicle on the basis of the energy detected by the energy detecting means, and the variation of the speed of the vehicle, detected by the vehicle-speed variation detecting means; and braking-force setting means (blocks B20 and B30) for setting the braking force larger as the weight of the vehicle, computed by the first vehicle-weight computing means, becomes larger. COPYRIGHT: (C)2007,JPO&INPIT

Braking control unit of vehicle

PROBLEM TO BE SOLVED: To provide an operating liquid foreign matter including degree detecting device and a hydraulic brake system having its detecting device, for detecting an operating liquid foreign matter including degree in a hydraulic control device. SOLUTION: After a control valve transfers to a closing state from an opening state, the existence of liquid leakage in the control valve is detected, and a leakage occurrence rate being the ratio of a frequency of detecting the occurrence of liquid leakage to a frequency of detecting the existence of liquid leakage, is determined in S72. There is a correlation between its liquid leakage occurrence rate and the operating liquid foreign matter including degree, and the operating liquid foreign matter including degree is estimated on the basis of the leakage occurrence rate in S86. When a liquid leakage detecting device is already arranged, this operating liquid including degree detecting device is provided by adding a program for estimating the operating liquid including degree to a computer of its detecting device, and the purpose is extremely inexpensively attained. COPYRIGHT: (C)2006,JPO&NCIPI

Operating liquid foreign matter including degree detecting device and hydraulic brake system

PROBLEM TO BE SOLVED: To obtain operating characteristics of a solenoid valve while suppressing effects on a vehicle environment after an ignition switch is turned off. SOLUTION: In a brake hydraulic pressure control device 100, a learning control part 202 performs learning control for obtaining operating characteristics of a pressure intensifying valve 40 or a pressure reducing valve 42 by operating the pressure intensifying valve 40 or the pressure reducing valve 42 to change brake hydraulic pressure with the ignition switch turned off. Before performing the learning control with the ignition switch turned on, the learning control part 202 applies a pre-load to a wheel cylinder so as to make the width of the change smaller than that of the wheel cylinder pressure during the learning control. At this time, when the change of the wheel cylinder pressure satisfies a predetermined condition, the learning control part 202 does not perform the learning control. COPYRIGHT: (C)2008,JPO&INPIT

Tetsuya Miyazaki

Papers

Vehicular braking system

Brake operating device and vehicular braking device

Braking control unit of vehicle

Operating liquid foreign matter including degree detecting device and hydraulic brake system

Hydraulic pressure control device