Abstract: A brake apparatus has two switching elements in an initial check function section, and detects a broken wiring failure of an actuator by turning on only one of the two switching elements. Therefore, during the initial check, a drive current does not flow through the actuator. Thus, it becomes possible to perform the initial check without operating the actuator. By making it possible to perform the initial check without operating the actuator in this manner, it becomes possible to prevent occurrence of the problem of rush current occurring when the actuator is operated for a short time and the problem of the switching elements being destroyed.

Abstract: A master cylinder MC is connected to wheel cylinders via brake conduits, and electromagnetic opening/closing valves configured as two-position valves with two ports are provided in the brake conduits, respectively. A brake conduit connects an area among a brake conduit between an electromagnetic opening/closing valve and pressure increase control valves with an area among another brake conduit between another electromagnetic opening/closing valve and pressure increase control valves. The brake conduit therebetween is provided with an electromagnetic opening/closing valve formed from a two-position valve with two ports. By using such a configuration, various controls can be executed as required in the event of an emergency, in addition to normal braking including automatic braking.

Abstract: In a parallel relay circuit, only one of a plurality of relays is turned on sequentially while turning the rest of the relays off. It is determined whether the motor is applied with voltage via a voltage detection resistor when each of the relays is turned on individually such that a disconnection abnormality in the respective relays is detected. As the disconnection abnormality in each of the relays can be detected individually, it is possible to detect a disconnection abnormality that has been occurred at least in a part of the relays, and to alert a driver for the abnormality.

Abstract: A malfunction detection device of a bellows type accumulator for pressurized fluid includes malfunction judgment unit for judging a malfunction of the bellows type accumulator on the basis of a detection output of the pressure sensor. The malfunction judgement unit judges that the malfunction of the seal member generates when the difference between a peak pressure value appeared before a predetermined time is past after the starting of the pressure increase from a value below a predetermined value in the inlet and outlet port and a stable fluid pressure appeared after the appearance of the peak pressure value is not within a predetermined range and/or when the peak pressure value does not appear before the progress of the predetermined time.

Abstract: A vehicle hydraulic brake apparatus includes a linear solenoid valve unit for controlling a power hydraulic pressure supplied to a master cylinder from an auxiliary hydraulic pressure source. Master cylinder hydraulic pressure from the master cylinder detected by a pressure sensor is compared with a predetermined reference hydraulic pressure when the linear solenoid valve unit is electrically excited under a condition that the communication between the master cylinder and the wheel cylinders is interrupted by a hydraulic pressure control valve device disposed between the master cylinder and the wheel brake cylinders while the vehicle engine is activated and a brake operating member is not operated. The electric current supplied to the linear solenoid valve unit is corrected in response to a result of this comparison.

Abstract: A vehicle hydraulic brake apparatus includes a controller and a hydraulic pressure detector which detects a master cylinder hydraulic pressure produced by a master cylinder. The controller compares the master cylinder hydraulic pressure detected by the hydraulic pressure detector with a predetermined pressure value, implements operation of the auxiliary hydraulic pressure source when the depressing operation of the brake operating member is judged to be in a stage where the detected master cylinder hydraulic pressure is above the predetermined pressure value, and terminates the operation of the auxiliary hydraulic pressure source when the master cylinder hydraulic pressure detected by the hydraulic pressure detector is stabilized at an approximately fixed pressure value after being increased.

Abstract: A hydraulic brake apparatus for a vehicle comprises a master cylinder and an auxiliary hydraulic pressure source. A master cylinder hydraulic pressure outputted from the master cylinder is adjusted by adding a master cylinder hydraulic pressure in response to an operation of a brake operating member to a master cylinder hydraulic pressure at an auto-braking control when the brake operating member is operated during the auto-braking control. The master cylinder hydraulic pressure is adjusted by controlling an operation of a valve means so as to increase a power hydraulic-pressure supplied from the auxiliary hydraulic pressure source to a regulating means corresponding to the amount of the operation of the brake operating member.

Abstract: A malfunction detection device of a bellows type accumulator for pressurized fluid includes malfunction judgment unit for judging a malfunction of the bellows type accumulator on the basis of a detection output of the pressure sensor. The malfunction judgment unit judges that the malfunction of the seal member generates when the difference between a peak pressure value appeared before a predetermined time is past after the starting of the pressure increase from a value below a predetermined value in the inlet and outlet port and a stable fluid pressure appeared after the appearance of the peak pressure value is not within a predetermined range and/or when the peak pressure value does not appear before the progress of the predetermined time.

Abstract: A vehicle hydraulic brake apparatus includes a controller and a hydraulic pressure detector which detects a master cylinder hydraulic pressure produced by a master cylinder. The controller compares the master cylinder hydraulic pressure detected by the hydraulic pressure detector with a predetermined pressure value, implements operation of the auxiliary hydraulic pressure source when the depressing operation of the brake operating member is judged to be in a stage where the detected master cylinder hydraulic pressure is above the predetermined pressure value, and terminates the operation of the auxiliary hydraulic pressure source when the master cylinder hydraulic pressure detected by the hydraulic pressure detector is stabilized at an approximately fixed pressure value after being increased.

Abstract: A hydraulic brake apparatus for a vehicle comprises a master cylinder and an auxiliary hydraulic pressure source. A master cylinder hydraulic pressure outputted from the master cylinder is adjusted by adding a master cylinder hydraulic pressure in response to an operation of a brake operating member to a master cylinder hydraulic pressure at an auto-braking control when the brake operating member is operated during the auto-braking control. The master cylinder hydraulic pressure is adjusted by controlling an operation of a valve means so as to increase a power hydraulic-pressure supplied from the auxiliary hydraulic pressure source to a regulating means corresponding to the amount of the operation of the brake operating member.

Abstract: A vehicle hydraulic brake apparatus includes a linear solenoid valve unit for controlling a power hydraulic pressure supplied to a master cylinder from an auxiliary hydraulic pressure source. Master cylinder hydraulic pressure from the master cylinder detected by a pressure sensor is compared with a predetermined reference hydraulic pressure when the linear solenoid valve unit is electrically excited under a condition that the communication between the master cylinder and the wheel cylinders is interrupted by a hydraulic pressure control valve device disposed between the master cylinder and the wheel brake cylinders while the vehicle engine is activated and a brake operating member is not operated. The electric current supplied to the linear solenoid valve unit is corrected in response to a result of this comparison.

Abstract: An antilock brake system (ABS) control apparatus for a four-wheel drive vehicle, having a slope identifier for determining the drive status of the vehicle along a slope before an ABS control is started, and a controller that changes the usual ABS control to a control in which the ABS control is restricted on condition that the state of the drive along the slope has been decided, whereby the braking distance of the vehicle during the drive along the slope can be shortened.

Abstract: The yaw moment reducing device comprises wheel speed sensors for detecting the speeds of the right and left wheels, an acceleration calculation device for calculating accelerations of the right and left wheels based on the speed of the right and left wheels, a substraction device for subtracting the difference in accelerations between the right and left wheels, a braking control device for controlling the braking force based on the difference of the accelerations, and a brake pressure modulating device for modulating the brake pressure which is supplied to each wheel. The wheel speeds of each wheel are detected by the wheel speed sensors. The acceleration calculation device calculates the accelerations of each wheel while the substraction device provides the difference in accelerations between the right and left wheels. The yaw moment is in response to the difference of the acceleration between the right and left wheels.

Abstract: The invention is directed to an arrangement for controlling a braking force applied to each of the road wheels of a part time four-wheel drive vehicle depending upon a braking condition, with a hydraulic braking pressure supplied to each of wheel brake cylinders through pressure control valves respectively. The pressure control valves are controlled by the braking force controller into which output signals of wheel speed sensors are fed. A deceleration of the vehicle is detected by a deceleration sensor. In a counter, counted is the number of repetitions of decrease of the wheel speed of each road wheel down to below a predetermined standard speed and recovery of the wheel speed up to and over the standard speed. The value counted in each road wheel during a predetermined period of time in the counter is compared with a predetermined value in a comparator.

Abstract: The invention is directed to an arrangement for controlling a braking force applied to each of road wheels of a rear drive vehicle depending upon a braking condition, with a hydraulic braking pressure supplied to each of wheel brake cylinders through pressure control valves respectively. The pressure control valves are controlled by the braking force controller into which output signals of wheel speed sensors are fed. In a first determination unit, it is determined if at least one of the front road wheels is on a road surface of a coefficient of friction lower than a predetermined value, and determined if the front wheel speed of one of the front road wheels has reached to a peak wheel speed. And, in a second determination unit, it is determined if a difference between the front wheel speed and rear wheel speed is less than a predetermined speed.