Abstract: A magnetic load sensor is provided which is high in axial rigidity. The load sensor includes a pair of parallel plate coupled together by coupling pieces. The coupling pieces are inclined relative to the axial direction such that when an axial load is applied to the parallel plates, the parallel plates are displaced relative to each other in a direction perpendicular to the axial direction, due to deflection of the coupling pieces. A magnetic target is mounted to the parallel plate, and a magnetic sensor element is mounted to the parallel plate such that when the parallel plates are displaced relative to each other in the direction perpendicular to the axial direction, the magnetic target and the magnetic sensor element are displaced relative to each other in the direction perpendicular to the axial direction.

Abstract: The electric brake device includes an electric motor, a friction pad, a linear motion mechanism, a braking force command section, a braking force estimation section, and a controller. The controller is provided with a pad wear amount estimation section to estimate a wear amount of the friction pad and a motor rotation angle detector to detect a motor rotation angle. The pad wear amount estimation section estimates a wear amount of the friction pad from the rotation angle of the electric motor, obtained by the motor rotation angle detector, which rotation angle corresponds to a distance between a retraction end at which a linear motion portion of the linear motion mechanism is separated from a brake rotor and an advance end at which the linear motion portion approaching the brake rotor generates the braking force.

Abstract: Provided is an electric brake device that can prevent a pad wear from progressing beyond its limit, and can estimate the wear of the friction pad without an increase in cost and space. The electric brake device includes: an electric motor; a brake rotor; a friction pad; a linear motion mechanism; a braking force command section; a braking force estimation section; a motor rotation angle detector; and a controller. The controller is provided with a pad wear amount estimation section configured to estimate a wear amount of the friction pad at a present time by comparing a correlation between the motor rotation angle detected by the motor rotation angle detector and the braking force obtained by the braking force estimation section with a defined correlation between a motor rotation angle and a braking force when the friction pad is unworn.

Abstract: Provided is an electric brake device that can achieve improved control accuracy without involving a cost increase. The electric brake device includes an electric motor, a brake rotor, a friction pad, a transmission mechanism, a braking force command section, a braking force estimation section, a motor rotation angle detector, and a controller. The motor rotation angle detector, which is used in a partial region of a braking force from a minimum braking force to a maximum braking force, has a higher resolution than a motor rotation angle that causes a braking force fluctuation equivalent to a minimum braking force resolution of the braking force estimation section. The controller includes a resolution interpolation section configured to interpolate, by using a motor rotation angle detected by the motor rotation angle detector, a minimum resolution of the braking force obtained by the braking force estimation section.

Abstract: An electric brake device includes an electric motor; a braking force application mechanism configured to apply a braking force on a vehicle wheel; a lock mechanism configured to assume one of a locked condition; a temperature sensor configured to measure an ambient temperature of a vehicle; and a freezing preventive power supply unit configured to initiate supply of an electric power to the electric motor or a drive source of the lock mechanism. The freezing preventive power supply unit interrupts the supply of the electric power to the electric motor or the drive source of the lock mechanism when the temperature detected by the temperature sensor exceeds a second preset temperature T2 that is higher than a first preset temperature T1.

Abstract: An electric brake system includes a plurality of electric brake devices. A control device of each electric brake device includes: an abnormality determination section that determines whether there is abnormality in supply of power from a power supply device to the electric brake device; and a redundant function control section that, when the abnormality determination section has determined that there is abnormality in supply of power, controls the braking force by using an auxiliary power supply in accordance with a predetermined condition. The redundant function control section controls the braking force by using the auxiliary power supply at least when a desired braking force cannot be output even with all the electric brake devices for which the abnormality determination section has determined that there is no abnormality in supply of power, as the predetermined condition.

Abstract: Provided is an electric braking system configured to prevent antilock control from being unintentionally ended so that the braking behavior can be stabilized. An antilock control function unit includes an antilock control intervention determination unit configured to determine whether or not to execute antilock control. A braking force control device includes a switching function unit configured to switch between follow-up control by a normal control unit and the antilock control by the antilock control function unit on the basis of the determination by the antilock control intervention determination unit. The antilock control intervention determination unit ends execution of the antilock control when, for example, a braking force under the antilock control becomes equal to or higher than a required braking force while the antilock control is being executed.

Abstract: Both of a quiet operation with smaller torque variation for prioritizing NVH and a high torque operation or high output operation for prioritizing torque or output may be provided by selectively using, based on requests, a control scheme that reduces torque variation and a control scheme that maximizes a torque. A motor current calculator may be capable of selectively using an output prioritizing control scheme that prioritizes a torque output and a torque variation suppressing control scheme that prioritizes smaller torque variation. An output requirement determiner may be provided to calculate a degree of importance of suppressing torque variation of an electric motor, based on one or both of a braking request and a travel condition of a vehicle. In accordance with this determination result, the motor current calculator may selectively use the output prioritizing control scheme and the torque variation suppressing control scheme.

Abstract: Provided is an electric brake system that changes responsiveness depending on responsiveness required for an electric brake device, thereby enabling operation sound and power consumption to be reduced without influencing movement of a vehicle. The electric brake system includes one or more electric brake device (3) each having a control operation module (12) for performing follow-up control for a target braking force. The electric brake system includes a response requirement determination module (14) for determining responsiveness required for the brake actuator (4) from one or both of a braking requirement and the vehicle travelling condition. The braking requirement is outputted from a brake operation member or a vehicle-stable-travelling control system. The electric brake system includes a control modification module (15) for changing a control operation formula to be used for follow-up control by the module (12), depending on responsiveness determined by the module (14).

Abstract: An electric brake device includes an electric brake actuator and a control device. The controller includes: a brake control calculator that control a braking force so as to follow up a target braking force provided from a host ECU; a brake maintaining current estimator that maintains a motor current at a constant value; and a switching controller that performs switching between the brake control calculator and the brake maintaining current estimator. When a condition that an absolute value of a rate of change of the target braking force is equal to or less than a predetermined value and the braking force is in the follow-up state is satisfied, the switching controller performs switching from the brake control calculator to the brake maintaining current estimator that maintains the motor current at a constant value.

Abstract: A controller of the electric brake device includes a reaction force compensator to perform compensation such that a rotational resistance, of an electric motor, generated by a reaction force to a pressing force of a friction member against a brake rotor is cancelled out. The reaction force compensator includes: a direct estimator to directly estimate the reaction force from information including at least either a drive voltage or current of the electric motor and at least either a rotational angle of the electric motor or a value obtained by differentiating the rotational angle one or more times; an indirect estimator to estimate the reaction force from an estimated braking force on the basis of a set correlation; and a compensation reaction force determiner to determine a reaction force, to perform the compensation, by using estimation results of direct estimation and indirect estimation at predetermined proportions.

Abstract: Provided is an electric brake device that is able to achieve redundancy when an abnormality occurs in a load sensor, without increasing the size of the load sensor. The electric brake device includes a brake rotor, a friction pad, an electric motor, a transmission mechanism, braking force command section, braking force estimation section, motor rotation angle detector, and a controller. The braking force estimation section includes a load sensor configured to detect elastic deformation of a determined member forming the electric brake device. The controller includes sensor abnormality detector configured to store a sensor output of the load sensor at a motor rotation angle at which a braking force becomes zero, and infer the occurrence of plastic deformation in the load sensor from transition of the stored sensor output.

Abstract: The friction brake system includes a braking force distributor configured to output load command values to friction brake devices for a plurality of wheels, and a friction coefficient estimation calculation section configured to estimate a friction coefficient between a brake rotor and a friction material of each friction brake device. The friction coefficient estimation calculation section includes a distribution adjustment section configured to change distribution of brake pressing force to be distributed by the braking force distributor, for estimation of the friction coefficient, and an estimation calculation section configured to estimate the friction coefficient on the basis of a relationship between deceleration of a vehicle and the load command values the distribution of which is changed.

Abstract: The electric linear motion actuator includes an electric motor, a drive shaft configured to be rotated by the electric motor, a rotation-to-linear motion converting mechanism configured to convert the rotational motion of the drive shaft to the axial linear motion of an axially movably supported outer ring member, and an electric locking mechanism incorporated in a reduction gear mechanism in which the rotation of a rotor shaft of the electric motor is reduced in speed and transmitted to the drive shaft. When the electric locking mechanism is energized, the power transmission path shifts to the locked state in which power cannot be transmitted, and when the electric locking mechanism is de-energized thereafter, the power transmission path is kept in the locked state. The electric locking mechanism is built in a motor case of the electric motor so that the electric motor and the electric locking mechanism are unitized.

Abstract: Two electric brake devices are mounted to respective wheels of a vehicle and each include an electric motor. If fluctuations in braking force occurs in one of the two electric brake devices, a control device calculates operating quantities of the respective electric brake devices based on the deviation between a command value of the sum of the braking forces of the electric brake devices and the sum of the feedback values of the braking forces of the electric brake devices, and causes both electric control devices to perform compensation operations for compensating for the braking force fluctuations while keeping constant the sum of the respective braking forces. This makes it possible to effectively reduce the braking force fluctuations even if the operating amplitudes of the individual electric brake devices are small.

Abstract: An electric brake device is provided which is capable of early detecting presence/absence of abnormality in the brake device during the traveling of a vehicle in the absence of the operation of a brake application device. A controller includes an abnormality detecting operation controller which operates the electric motor according to a predetermined condition during the traveling of the vehicle in the absence of the operation of the brake application device. The device further includes an abnormality detector which obtains a measured value of a predetermined item related to the vehicle when the electric motor is operated by the abnormality detecting operation controller, and compares the measured value with an estimated value or a set value to detect presence/absence of abnormality in the brake device.

Abstract: The electric brake device includes an electric motor, a friction member operator, a friction member, a brake rotor, and a control device. A braking force estimator provided in the control device includes: a direct estimator configured to convert output of a braking force sensor which detects a load or displacement corresponding amount, to a braking force; and an indirect estimator configured to estimate the braking force on the basis of information other than output of the braking force sensor. A range in which the braking force is estimated by the direct estimator is a specified low-braking-force range, and in a range beyond this range, estimation of the braking force is performed by the indirect estimator.

Abstract: A brake integrated control section generates, as target values, a target braking force and a target wheel speed equivalent value of each electric brake device, and transmits the target braking force and the target wheel speed equivalent value to a target value transmitter. An electric brake control device of each electric brake device includes a braking force controller that controls an electric motor in accordance with the target braking force, a wheel speed controller that controls the electric motor in accordance with the target wheel speed equivalent value, and a control switcher. The control switcher switches between use of the braking force controller and use of the wheel speed controller in accordance with a predetermined condition.

Abstract: A parking brake mechanism achieves a parking brake function using a friction material operation mechanism driven by a main brake motor. The parking brake mechanism includes a parking brake motor provided coaxially with one of rotational shafts transmitting a torque from the main brake motor to the friction material operation mechanism. A linear motion mechanism moves a rotor of the motor and an engaging mechanism. The engaging mechanism includes a rotor-side engaging portion and a housing-side engaging portion engaging with each other when the rotor is moved linearly to a predetermined position by the linear motion mechanism. Engagement of the engaging mechanism achieves a pressing force holding function of holding an angle of the rotational shaft against a reaction force of the pressing force of a friction material.

Abstract: This electric brake device includes: a brake rotor; a friction member; friction member operator configured to bring the friction member into contact with the brake rotor; an electric motor configured to drive the friction member operator; and a controller configured to control a braking force by means of the electric motor. The controller includes: heat balance degree estimator configured to estimate a balance degree among heat generation amounts of a plurality of exciting coils in the electric motor; and heat load balancing section configured to decrease a heat generation amount of a specific exciting coil when the heat balance degree estimator has estimated that the heat generation amount of the specific exciting coil among the plurality of exciting coils is larger than heat generation amounts of the other exciting coils.