A brake system for a vehicle, including: a brake operation member; a hydraulic brake device configured to give a braking force based on an operation of the brake operation member; an electric brake device configured to give a braking force generated by an electric actuator; a regenerative brake device configured to give a braking force utilizing electric power generation by rotation of a wheel, and a controller configured to determine insufficient braking force by excluding the braking force by the hydraulic brake device from a required overall braking force required for the vehicle as a whole and to control the braking force by each of the electric brake device and the regenerative brake device based on the insufficient braking force, wherein the brake system is configured such that the hydraulic brake device gives the braking force when the required overall braking force exceeds a threshold.

A brake system comprises a reservoir; a brake pedal; a master cylinder including a first master chamber, a second master chamber, a first master piston, and a second master piston; a first hydraulic circuit including at least one first hydraulic wheel brake; a second hydraulic circuit including at least one second hydraulic wheel brake; and a hydraulic pressure supplier including an actuator for pressurizing the first hydraulic circuit and the second hydraulic circuit depending on an operation of the brake pedal in a normal operating mode. The master cylinder further comprises a locking chamber and an elastic pedal feel element arranged in the first master chamber to be in contact with the first master piston and the second master piston for generating a pedal force when the brake pedal is operated while the second master piston is locked in the normal operating mode.

A control unit for controlling an upstream braking actuator for generating upstream pressure and a downstream braking actuator for controlling braking pressures of four wheels using the upstream pressure is configured to, when a braking pressure of any wheel cannot be reduced, perform backup control so that the target upstream pressure becomes the target braking pressure of the relevant wheel, and is configured to, when performing anti-skid control in a situation where automatic braking and backup control are being performed, control the target upstream pressure such that the target upstream pressure becomes a target upstream pressure for the automatic braking when the target upstream pressure is the target braking pressure for the relevant wheel, and such that the target upstream pressure becomes the target braking pressure for the anti-skid of the relevant wheel when the target upstream pressure is not the target braking pressure of the relevant wheel.

Provided is a piston push rod assembly which can prevent discomfort from being imparted during the operation of a brake pedal by a driver. A piston push rod assembly, wherein: a second piston is provided with a piston slide section which is housed in a cylinder and which slides relative to the cylinder, and a connection tube section which is connected to a push rod; the piston slide section is covered by metal plating; the connection tube section has a non-plated section; and the second piston and the push rod are connected by the caulking of the connection tube section when the push rod has been inserted inside the connection tube section.

For traction control, different filters, i.e., a hydraulic-pressure-increase filter and a hydraulic-pressure-decrease filter, are provided for increasing and decreasing target pressure, respectively. The inhibiting effect that the hydraulic-pressure-increase filter exhibits with respect to target pressure changes is made less than the inhibiting effect that the hydraulic-pressure-decrease filter exhibits with respect to changes in the target pressure, and so the target pressure is increased quickly but decreased slowly. As such, even if the wheel-cylinder pressure decreases subsequent to the actual wheel-cylinder pressure having increased to follow the target pressure, the wheel-cylinder pressure decreases only gradually, reducing the amount of pressure increase needed to reach the target pressure when the wheel-cylinder pressure is next increased. The wheel-cylinder pressure can thus be increased sufficiently to reach the target pressure with a high degree of responsiveness, making it possible to prevent being unable to increase the wheel-cylinder pressure accurately due to low pressurization performance.

An electronic brake system may include a hydraulic pressure supply device having a motor configured to be operated by receiving an electrical signal from the pedal displacement sensor when the brake pedal is operated, a gear pump configured to discharge and suction a hydraulic pressure depending on a rotational force of the motor, and a power transmission unit configured to deliver the rotational force of the motor to the gear pump; a hydraulic control unit having first and second hydraulic circuits configured to receive the hydraulic pressure by a force generated by the hydraulic pressure supply device to control hydraulic pressure flows delivered to wheel cylinders provided on wheels; and an electronic control unit configured to control the motor and valves based on hydraulic pressure information and pedal displacement information.

Provided is a brake apparatus, a brake control method, and a method for determining a lock abnormality in a motor capable of reducing motor drive noise at the time of a self-diagnosis of the motor regardless of a condition. A brake control method includes issuing a drive instruction to repeat ON/OFF driving a plurality of times and drive a motor in such a manner that a rotational frequency of the motor during an OFF time period does not fall to zero and a peak of the rotational frequency of the motor during an ON time period increases as the ON/OFF driving is repeated, carrying out terminal voltage detection to detect a terminal voltage of the motor at the time of the ON/OFF driving carried out by the issuing of the drive instruction, and determining a lock abnormality in the motor to determine whether there is the lock abnormality in the motor based on a characteristic of the terminal voltage during the OFF time period of the ON/OFF driving that is detected by the carrying out of the terminal voltage detection.

Electronic brake system is disclosed. An electronic brake system includes, a pressure sensor including a first pressure sensor configured to measure a hydraulic pressure of the accumulator, a second pressure sensor configured to measure a hydraulic pressure of the first hydraulic circuit, and a third pressure sensor configured to measure a hydraulic pressure of the second hydraulic circuit, a driver including one or more apply valves and release valves configured to control the hydraulic pressures of the first hydraulic circuit and the second hydraulic circuit, a determiner configured to determine that at least one of the first hydraulic circuit and the second hydraulic circuit has failed when an absolute value of a slope of the pressure measured by the first pressure sensor is greater than a preset first threshold value and the pressure measured by the first pressure sensor is less than a preset second threshold value and a controller configured to close apply valves of the first hydraulic circuit and the second hydraulic circuit when the failure has been determined, determine that a leak has occurred in one of the first and second hydraulic circuits having an amount of pressure change greater than that of the other hydraulic circuit measured on the basis of the second pressure sensor and the third pressure sensor, and control braking using only the hydraulic circuit operating normally.

This hydraulic pressure control device is provided with: a housing having a motor mounted to a surface on one side thereof and which has an oil passage formed thereinside; a case which is mounted to a surface on the other side of the housing and has a circuit board disposed thereinside; a sensor which detects a signal of the motor; a signal wire which connects between the sensor and the circuit board; and a power wire through which electric power is supplied to the motor, wherein the signal wire and the power wire are disposed inside a single through-hole that is formed in the housing so as to penetrate from the surface on the one side to the surface on the other side, and the signal wire or the power wire within the through-hole is covered with a shielding member that blocks out power supply noise generated during power supply.

The present invention relates to a master cylinder arrangement (1) for a brake system (10), comprising a tandem master cylinder (2) including a master cylinder housing (20), a first master piston (23) movably arranged in the master cylinder housing (20), a second master piston (24) movably arranged in the master cylinder housing (20), a balancing piston (7) movably arranged in the second master piston (24), and an elastic pedal feel element (50). The invention further relates to a hydraulic system for a brake system as well as a brake system (10).