Abstract: In an application, which refers to holding actuation of a parking brake mechanism (a rotation-linear motion conversion mechanism), a braking control apparatus (a parking brake control apparatus) determines an application stroke from a load detection point including as far as an overshoot amount. The load detection point is a generation point of a thrust force that is detected due to a current flowing in the electric motor. The overshoot amount is generated based on a rotation of an electric motor due to inertia after driving of the electric motor is stopped. The braking control apparatus determines a target release stroke in a release, which is release actuation of the parking brake mechanism, according to the application stroke. The braking control apparatus outputs a control instruction to conduct the release based on the target release stroke.

Abstract: A parking brake control apparatus acquires a first physical amount indicating a change in a current applied to an electric motor (for example, a gradient of a change in a current) at the time of an application operation. The parking brake control apparatus sets a second physical amount indicating completion of the application operation so as to make it smaller when the first physical amount (for example, the gradient of the change in the current) exceeds a predetermined threshold value, compared to when the first physical amount is equal to or smaller than the threshold value. The parking brake control apparatus determines the completion of the application operation when a physical amount indicating the application operation (for example, a current value) reaches the second physical amount.

Abstract: A parking brake control apparatus (24) stops driving of an electric motor (7A) when a current value of the electric motor (7A) reaches a target current threshold value, when driving the electric motor (7A) to press brake pads (6C) against a disk rotor (4) and hold a braking force. The target current threshold value is a current value for stopping the driving of the electric motor (7A). The parking brake control apparatus (24) changes the target current threshold value according to a rotational acceleration of the electric motor (7A).

Abstract: Accurately controlling pressing thrust regardless of an individual difference and a use situation of a brake apparatus, and the like are set forth herein. The present invention controls a motor that applies thrust to a piston that presses a brake pad, in a current variation period before an idling current period, a variation in the current and the voltage or a variation in a function including the current and the voltage in the idling current period is computed as a plurality of prospective values. At a predetermined time T0 during the current variation period, one of the plurality of prospective values is selected on the basis of the current and the voltage, and on the basis of the variation in the current and the voltage or the function related to the selected prospective value, a characteristic parameter of the motor is computed to compute a stop current of the motor.

Abstract: An ESC 33 increases distribution of a braking force to rear wheels according to a reduction in a speed of a vehicle due to braking, and distributes the braking force so as to allow the vehicle to be kept stopped due to braking forces applied to the rear wheels when the vehicle stopped. Then, a second ECU holds the braking force by driving a parking mechanism with the vehicle kept stopped due to the braking forces applied to the rear wheels.

Abstract: Provided is a parking brake control device configured to, when releasing a hold on a braking force, energize an electric motor, and change a drive time of the electric motor in accordance with a current change amount in a predetermined interval after a predetermined time has elapsed since a current value of the electric motor starts to decrease after increasing and a current value at which the current change amount of the electric motor converges to a predetermined value or less.

Abstract: An electric booster including an input member that is advanceably/retractably moved according to a brake pedal operation. An electric motor of an electric actuator advanceably/retractably moves a power piston. A master pressure control unit sets a target movement amount of the power piston according to an amount of a movement of the input member that is caused by the brake pedal, and controls the electric motor to move the power piston so as to achieve the target movement amount, thereby causing a brake hydraulic pressure to be generated in a master cylinder. The master pressure control unit includes a reaction force generation portion, which changes a characteristic of a hydraulic reaction force applied to the brake pedal. The reaction force generation portion corrects the target movement amount of the power piston according to a temporal change in the movement amount of the input member.

Abstract: An electric brake system includes a hydraulic pressure control circuit configured to acquire a detected value from a hydraulic pressure detection portion configured to detect a hydraulic pressure in a master cylinder and control driving of an electric actuator in such a manner that a target hydraulic pressure corresponding to a braking instruction is generated in the master cylinder, a fluid amount control circuit configured to drive a fluid amount supply device disposed between the master cylinder and a wheel cylinder to control a fluid amount to supply to the wheel cylinder, and a storage circuit configured to store a fluid amount characteristic, which is a characteristic of the fluid amount with respect to the detected value. The fluid amount control circuit controls the fluid amount supply device based on the fluid amount characteristic stored in the storage circuit.

Abstract: An electric booster including an input member that is advanceably/retractably moved according to a brake pedal operation. An electric motor of an electric actuator advanceably/retractably moves a power piston. A master pressure control unit sets a target movement amount of the power piston according to an amount of a movement of the input member that is caused by the brake pedal, and controls the electric motor to move the power piston so as to achieve the target movement amount, thereby causing a brake hydraulic pressure to be generated in a master cylinder. The master pressure control unit includes a reaction force generation portion, which changes a characteristic of a hydraulic reaction force applied to the brake pedal. The reaction force generation portion corrects the target movement amount of the power piston according to a temporal change in the movement amount of the input member.

Abstract: Even when downstream stiffness in a brake hydraulic circuit changes due to variation in a caliper forming a part of a wheel cylinder, temperature, wear degree, and deterioration of a frictional pad, and/or the like, a brake control apparatus performs calculation processing for calculating a switching reference operation amount, switching operation amount deviation calculation processing for calculating a deviation from the switching reference operation amount, operation amount offset processing for offsetting a pedal operation amount detected by an operation amount detection unit, target hydraulic pressure calculation processing for calculating the target hydraulic pressure with use of the offset operation amount and a reference hydraulic characteristic, and control of the electric motor (21) according to the target hydraulic pressure.

Abstract: A brake control device capable of suppressing a sense of discomfort felt by a driver. The brake control device (31) includes a braking command addition part (34A) for adding an automatic-brake braking command value (B) output from an automatic-brake braking command calculation part (32) and a pedal operation braking command value (A) output from a pedal operation braking command calculation part (34B). The pedal operation braking command calculation part includes a pedal operation braking command selection part (34B1), a normal brake characteristic part (34B2) for holding a normal brake characteristic, and an automatic brake characteristic part (34B3) for holding an automatic brake characteristic. The pedal operation braking command selection part selects a braking command value output from the automatic brake characteristic part when the automatic-brake braking command value is more than 0, and outputs the selection result to the braking command addition part as the pedal operation braking command value.

Abstract: Even when downstream stiffness in a brake hydraulic circuit changes due to variation in a caliper forming a part of a wheel cylinder, temperature, wear degree, and deterioration of a frictional pad, and/or the like, a brake control apparatus performs calculation processing for calculating a switching reference operation amount, switching operation amount deviation calculation processing for calculating a deviation from the switching reference operation amount, operation amount offset processing for offsetting a pedal operation amount detected by an operation amount detection unit, target hydraulic pressure calculation processing for calculating the target hydraulic pressure with use of the offset operation amount and a reference hydraulic characteristic, and control of the electric motor (21) according to the target hydraulic pressure.

Abstract: A brake control device capable of suppressing a sense of discomfort felt by a driver. The brake control device (31) includes a braking command addition part (34A) for adding an automatic-brake braking command value (B) output from an automatic-brake braking command calculation part (32) and a pedal operation braking command value (A) output from a pedal operation braking command calculation part (34B). The pedal operation braking command calculation part includes a pedal operation braking command selection part (34B1), a normal brake characteristic part (34B2) for holding a normal brake characteristic, and an automatic brake characteristic part (34B3) for holding an automatic brake characteristic. The pedal operation braking command selection part selects a braking command value output from the automatic brake characteristic part when the automatic-brake braking command value is more than 0, and outputs the selection result to the braking command addition part as the pedal operation braking command value.

Abstract: A brake control system which can maintain the behavior of a vehicle stable when wheels slip. A slip amount detector (56), configured to detect an amount of slip at the front and rear wheels, is connected to a second ECU (35). A first ECU (27) has a regenerative slip control unit which executes repeatedly a slip restricting control in which, while the front wheels are being detected as slipping based on a detection value of the slip amount detector during the execution of regenerative braking by a motor-generator (55), the amount of regenerative braking by the motor-generator is reduced by a predetermined amount, and thereafter, the resulting reduced amount of regenerative braking is held for a predetermined period of time. The regenerative slip control unit sets the predetermined reduction amount larger than a predetermined reduction amount by which the amount of regenerative braking is reduced in the slip restricting control.

Abstract: According to the present invention, limited electric power is consumed so as to achieve long-lasting use of electric power during brake control with the use of an auxiliary power supply source when there is a malfunction of a vehicle power supply source. In addition, a brake control device for ensuring responsiveness at the beginning of braking or when emergency braking is necessary is provided. The brake control device of the present invention is a brake control device for detecting electric signals generated depending on the degree of brake-pedal operation and calculating the driver's demanded braking force based on the electric signals so as to generate the demanded braking force, which comprises an auxiliary power supply source for supplying electric power to the brake control device when there is a malfunction of a vehicle power supply source and controls braking depending on the charged capacity of the auxiliary power supply source.

Abstract: A motor drive device inputs two detection signals from a rotation position sensor thereby to detect a rotation position, and controls a voltage to be applied to a motor according to the detected rotation position. The motor drive device has a control unit for outputting a first voltage in a first state in which the square sum of sampling values sampled from the two detection signals is a predetermined value, and outputting a second voltage in a second state in which the square sum is not the predetermined value.

Abstract: A brake control system is provided which can maintain, the behavior of a vehicle stable when wheels slip. A slip amount detector 56 configured to detect an amount of slip at wheels 2L, 2R, 3L, 3R is connected to a second ECU 35. A first ECU 27 has a regenerative slip control unit which executes repeatedly a slip restricting control in which while the front wheels 2L, 2R are being detected as slipping based on a detection value of the slip amount detector 56 during the execution of regenerative braking by a motor-generator 55, the amount of regenerative braking by the motor-generator 55 is reduced by a predetermined amount, and thereafter, the resulting reduced amount of regenerative braking is held for a predetermined period of time.

Abstract: When a driving force of a drive motor (21) becomes a maximum driving force even in the case where a brake pedal (5) is depressed by a large amount while a vehicle is in a stopped state, a second ECU (33) outputs a valve-closing command to a boost control valve (40, 40?) of an ESC (31) for a left front wheel (FL; front wheel 1L) and a right front wheel (FR; front wheel 1R). In this manner, a hydraulic pressure flowing from a master cylinder (8) through the ESC (31) to each wheel side is not supplied to wheel cylinders (3L, 3R) for the front wheels (1L, 1R) but is supplied only to wheel cylinders (4L, 4R) for rear wheels (2L, 2R). A hydraulic stiffness of the wheel cylinders (3L, 3R, 4L, 4R) is changed by stopping supply of a brake fluid to the wheel cylinders (3L, 3R).

Abstract: A brake system which can secure quietness in a passenger compartment is provided. A vehicle brake system 1 includes a brake assist device 2 which boosts a pressing force on a brake pedal 5 by drive of a motor 31, and an assist control unit 6 which controls the motor 31. The assist control unit 6 changes responsiveness of the motor 31 in accordance with a vehicle speed, and sets a dead zone amount and a filtering value to large values in a region with a low vehicle speed. Thereby, responsiveness of a boosting operation of the motor 31 to the operation of the brake pedal is made low, and a rotational variation and a vibration are prevented from occurring to the motor 31 by a minute variation of a detection signal of a stroke sensor 14 during low-speed traveling or stoppage of traveling.

Abstract: Provided is a brake control apparatus for a vehicle which detects an amount of brake-pedal operation by means of an electric signal, and then calculates a braking force demanded by a driver from the electric signal, and thereby generates the demanded braking force. A control mode for a braking force is switched from a normal control mode to a stationary-vehicle control mode, if a determination that the vehicle is in a stationary state is followed by another determination that an electric signal corresponding to an actual braking force exceeds a command value for a stationary-vehicle braking force while the vehicle is in the stationary state. The control mode for a braking force is switched from the stationary-vehicle control mode to the normal control mode, if it is determined that the demanded braking force becomes smaller than the command value for the stationary-vehicle braking force.