Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Mazda Motor Corporation

Wataru Yokoyama

Kenichiro Matsubara

Kimio Nishino

Daisuke Goto

Takahiro Ito

Tatsuro Kobune

Kenji Hashida

Shigeyuki Uehara

Michiharu Okada

Jun Watanabe

Shinji Seto

Yuki Tanaka

Hirotaka Oikawa

Kazutami Tago

Masaki Kanai

Takayasu Sakashita

Takaya Tsukagoshi

Ippei Suzuki

Hiroshi Chikuma

Tomoyuki Kotake

Tomohiro Ohara

Masayoshi Okamiya

Tatsuji Okubo

Itsuki Shimura

A rotary electric machine includes a stator including a coil, and a rotor in an inner peripheral side of the stator. The rotor core comprises a soft magnetic metal and a magnet within a magnet insertion hole, a first magnet stopper on a q axis side of the magnet in the magnet insertion hole, a magnet accommodation between the first magnet stopper on both sides of the magnet insertion hole, a first space portion communicating with the magnet insertion hole, a second space portion whose distance from the magnet is equal to or less than a thickness of the magnet and a radial length of a magnetic pole center is long, the second space portion formed on an inner peripheral side relative to the magnet, and a third space portion that has a convex shape on an inner peripheral side of a q axis of the magnet.

Rotary electric machine and in-vehicle motor system

Provided is an electric brake including: a brake mechanism configured to transmit, based on a braking request, a thrust force generated through drive of an electric motor to a piston configured to move brake pads to be pressed against a disc rotor; and an ECU for rear electric brake configured to control the drive of the electric motor, and to move, in a non-braking state, the piston to a predetermined clearance position at which a clearance between each of the brake pads and the disc rotor is a predetermined amount. The ECU for rear electric brake is configured to drive the electric motor so that a period from generation of the braking request to a start of the pressing of the disc rotor by the brake pads is a predetermined period regardless of a position of the piston at a time when the braking request is generated.

Electric brake, and control device

An electric brake apparatus includes a brake mechanism, a parking mechanism, and a main ECU and rear electric brake ECUs. The main ECU performs re-holding control (re-clamping) of, after holding a braking force by the parking mechanism, releasing the holding of the braking force with the braking force applied or maintained and further applying the braking force, and then holding the braking force by the parking mechanism after that. In this case, the main ECU does not release the braking force on a rear right wheel until completing the re-holding control on a rear left wheel side. Alternatively, the main ECU does not release the braking force on the rear left wheel side until completing the re-holding control on the rear right wheel.

Electric brake apparatus

An object of the present invention is to provide a brake control apparatus including a backup brake, which brake control apparatus makes it possible both to ensure deceleration, and to attain vehicle running stability. The present invention includes: a front-wheel-side braking mechanismthat includes a front-wheel-side electric hydraulic mechanism, and a hydraulic circuit system, and applies braking force to front wheelsL, andR; a rear-wheel-side braking mechanismthat applies braking on a rear wheel side; a backup brake that is actuated in accordance with a switch to the hydraulic circuit systemwhen the front-wheel-side electric hydraulic mechanismfails, and applies braking force to the front wheelsR, andL; and a skid determination threshold setting sectionthat sets a skid determination threshold. When the backup brake is actuated, the skid determination threshold setting sectionsets the skid determination threshold for the rear wheelsL, andR on the basis of braking force information of the backup brake.

Brake control apparatus

An electric brake comprises a brake mechanism that transmits a thrust generated by driving an electric motor to a piston that moves brake pads pressed against a disc rotor; a thrust sensor that detects the thrust applied to the piston; a rotation angle sensor that detects a rotational position of the electric motor; and a rear electric brake ECU that controls the driving of the electric motor on the basis of a braking command. The rear electric brake ECU detects an abnormality in the brake mechanism from a detected value of the thrust sensor and a detected value of the rotation angle sensor in response to the braking command which are obtained when the electric motor is driven.

Electric brake and control device

Provided is a brake device capable of stabilizing a deceleration at the time of starting braking. The brake device is configured to correct a distribution of a braking force to each wheel or a braking force for each wheel, based on a detection value obtained by a load position distribution detection unit configured to detect a position distribution of a load applied to the vehicle when the vehicle is stopped or is in an initial period of starting.

Brake device and vehicle control device

A vehicle control device, a vehicle control method, and a vehicle suitable for an automatic/manual driving mode vehicle that employs brakes capable of controlling braking forces of four wheels. A vehicle control device including a pitch angle adjustment unit that adjusts a pitch angle, which is an inclination of a vehicle generated in the vehicle when braking the vehicle, or a change amount of the pitch angle, the pitch angle adjustment unit adjusting the pitch angle according to a traveling mode of the vehicle instructed by a host controller provided in the vehicle.

Vehicle control device and vehicle

A brake system capable of accurately controlling a braking force includes a first and second brake devices that have different control accuracies, and a brake control device that controls a braking force of the first and second braking devices according to a required braking force. The brake control device has a first control mode in which the braking force of the first brake device is controlled to be smaller than the braking force of the second brake device, and a second control mode in which the braking force of the first brake device is increased rather than the first control mode. The second brake device is controlled so that a sum of the braking force of the first brake device and the braking force of the second brake device matches the required braking force.

Brake system and control method of brake system

A parking brake control apparatusdrives an electric motorB to advance a pistonaccording to an application request signal from a parking brake switch. The parking brake control apparatusincludes a running state detection portion that calculates a running state about whether a vehicle is running or stopped based on a wheel signal from a wheel speed sensor. When the running state cannot be calculated by the running state detection portion, the parking brake control apparatuscontrols the electric motorB in such a manner that the thrust force of the pistonchanges at a lower time rate of change than when the running state can be calculated.

A brake device having an electric parking brake function, capable of appropriately performing stepwise increase control for a clamping force. A control unit including a computing circuit (), a memory (), and each motor drive circuit () of a parking brake control device () includes a stepwise increase control unit configured to increase the clamping force generated by brake pads () to a disc rotor () in a stepwise manner. When start of contact between the disc rotor () and the brake pads () caused by feeding of power from the parking brake control device () to an electric motor (B) is detected based on a motor current from a current sensor unit (), the stepwise increase control unit performs control for repeatedly feeding and stopping power to the electric motor (B) to increase the clamping force in a stepwise manner in accordance with a predefined processing procedure.

Brake device

A parking brake controller () activates an electric actuator () in response to operation of a parking switch () to hold a disc brake () to serve as a parking brake. If a failure (fault) is detected in the parking switch (), the parking brake controller () activates the electric actuator () so as to hold the parking brake automatically upon detecting a condition that presumes the vehicle operator's intent not to drive any longer while the vehicle is at rest.

Brake system

Provided is a brake device capable of maintaining pads and a rotor in a desired positional relationship. When receiving a release request within a time period from start of execution of an application request to detection of contact between brake pad and a disc rotor, a parking brake control device inhibits execution of the release request, and executes the release request after detection of the contact between the brake pad and the disc rotor. Further, when receiving the application request within a time period from start of execution of the release request to detection of separation between the brake pad and the disc rotor, the parking brake control device inhibits execution of the application request, and executes the application request after detection of the separation between the brake pad and the disc rotor.

A brake apparatus comprising: a caliper having a piston configured to move a brake pad to be pressed on a disc rotor rotating with a wheel; a thrust retaining mechanism located in the caliper to thrust the piston and maintain braking force exerted by the thrust piston; an electric motor mounted on the caliper to operate the thrust retaining mechanism; and a controller configured to apply electric current to the electric motor in response to an application command or a release command, thereby perform control according to the commands, wherein the controller, upon receiving a release command, configured to operate the electric motor to reduce braking force exerted by the piston by performing current maintenance control which continuously applies electric current to the electric motor and switching control which successively switches between a larger and a smaller amount of electric current applied to the electric motor.

Brake apparatus

Provided is an engagement position storage device capable of detecting a clutch engagement position of a vehicle finely and a brake system including such a device. In an engagement position storage devicethat stores an engagement position of a clutch to engage and disengage power of a vehicle, when the vehicle becomes a traveling state in predetermined duration after acceleration in a front-back direction of the vehicle changes, the engagement position storage devicestores a clutch engagement position based on a clutch position detected when the acceleration changes. A brake systemincludes a wheel latching mechanismthat latches wheels of a vehicle by driving a propelling memberby driving devicesand; and a controllerthat controls driving of the propelling memberof the wheel latching mechanismbased on a clutch engagement position stored in the engagement position storage device

An electric brake apparatus includes an electric actuator configured to actuate a brake mechanism according to an actuation request signal, and an actuator controller configured to control an operation of the electric actuator with use of a power source mounted at a vehicle to perform control of holding and a release of braking by the brake mechanism. When a system recovers and the actuator controller detects that the control of the holding or the release has been interrupted with an uncompleted control state since system down occurred in the middle of the control of the holding or the release of the braking by the brake mechanism, the actuator controller maintains the interrupted state until a new actuation request signal is issued, and controls the operation of the electric actuator according to the content of the new actuation request signal.

Growing community of inventors

Kawasaki, Japan

Wataru Yokoyama