Toyota Jidosha Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

Aisin Aw Co., Ltd.

Asmo Co., Ltd.

Toyota Jidosha Kogyo Kabushiki

Kenji Shirai

Yasunori Yoshino

Yoshihisa Nomura

Genji Mizuno

Junichi Tanoue

Michiharu Nishii

Masahiko Kato

Akihiro Otomo

Yoshihiko Tada

Seiya Yokoyama

Shigeru Sakamoto

Atsushi Tabata

Yasuo Hojo

Eiji Nakamura

Kaoru Tsubouchi

Masato Kaigawa

Masashi Hattori

Takeshi Inuzuka

Hiroaki Yoshida

Satoru Niwa

Kiyoharu Nakamura

Fumiaki Kawahata

Hidetoshi Shimizu

Yutaka Ohnuma

Kaoru Nakamura

Chiaki Ochiai

Ryoichi Kurasako

Fumio Nakagawa

Yoshinori Takemura

Hideyuki Inoue

Mark Evans

Minoru Takeuchi

Masaaki Okuyama

Haruo Sugimoto

Makoto Asahara

Kazuhiko Imai

Tsutomu Oota

Ysohihiko Tada

Sumio Katsuno

An electrically operated braking system of a motor vehicle, including a brake having a friction member movable to be forced onto a rotor rotating with a vehicle wheel and thereby braking the wheel. The friction member is forced onto the rotor by an electric motor operated by an electric power supplied from an electric power source. A controller determines an amount of the electric power to be supplied to the motor, depending upon an operating amount of the brake operating member, and a relationship estimated by a relationship estimating and utilizing device. The relationship estimating and utilizing device obtains an actual value of the electric power supplied to the motor during operation of the brake while the vehicle is running, and an actual value of a braking torque applied from the brake to the wheel during the brake operation, and estimate a relationship between the electric power to be supplied to the wheel on the basis of the actual values obtained. The estimated relationship is then utilized to control the braking torque to be generated in response to operation of the brake operating member.

Electrically operated braking system having a device for operating electric motor of brake to obtain relationship between motor power and braking torque

In order to prevent a needlessly excessive yaw moment from being applied to the vehicle, thereby improving the running stability of the vehicle when either one of the braking force generation units went wrong, a brake system for vehicles having electric brake units ( ) each provided for each of the wheels to generate a braking force by its actuator ( ) being driven according to the amount of depression of a brake pedal, and a controller ( ) for controlling each of the electric brake units independently of others, is so constructed as to judge if any of the electric brake units went wrong (step ), and when either one of the electric brake units went wrong, to control the electric brake units other than the wrong unit according to the depression amount of the brake pedal so as to accomplish a best available stability of running of the vehicle.

Brake system for vehicles

Electrically operated braking system with a motor-driven disc brake including an electric motor for braking an automotive vehicle wheel, and a motor control device controlling the electric motor, the disc brake further including a disc rotor having a friction surface, a friction pad movable for contact with the friction surface to restrict rotation of the disc rotor, a pad support mechanism for supporting the friction pad movably in a direction intersecting the friction surface, a pad pressing mechanism including the electric motor and a pressing member, the electric motor producing a drive force for moving the pressing member to force the friction pad against the disc rotor, and a self-servo mechanism for providing a self-servo effect of boosting a friction force generated between the friction surface and the friction pad, on the basis of the friction force.

Braking system including motor-driven disc brake equipped with self-servo mechanism

An electric brake apparatus generates an appropriate brake force without unnecessarily consuming electric power. The electric brake apparatus has a brake actuator generating a brake force. The brake actuator uses a brake motor system including a brake motor as a power source. A motor current provided to the brake motor is generated under a normal control so as to generate a brake force required for a vehicle. The motor current generated under the normal control is reduced when the brake motor is overheated or when the vehicle is stopped for a long time.

Electric brake apparatus for controlling a current provided to a brake motor

An electric brake apparatus can positively prevent a brake motor from being excessively rotated in a reverse direction in which a braking force is cancelled. A determination is made as to whether or not the brake motor is excessively driven in the reverse direction. An operation of the brake motor is stopped when the brake motor is determined to be excessively driven in the reverse direction. Accordingly, a member of the electric brake apparatus moved by the brake motor is prevented from being excessively moved beyond a predetermined position. Thus, a part of the electric brake apparatus is prevented from being damaged due to an excessive movement of the member moved by the brake motor.

Electric brake apparatus having a brake motor prevented from being excessively moved in a reverse direction

A method of diagnosing an electrically operated brake for abnormality thereof in an automotive vehicle wherein a wheel is braked by a friction force generated by an electric motor of the brake upon an operation of a brake operating member, the method comprising the steps of: applying an abnormality checking drive signal to the electric motor to operate the electric motor while the brake operating member is placed in a non-operated position; detecting a quantity relating to an output of the electric motor while the drive signal is applied to the electric motor; and determining that the electrically operated brake is abnormal, if the detected quantity does not normally correspond to a magnitude of the abnormality checking drive signal.

Method and apparatus for diagnosing electrically operated brake without

An electrically operated brake for braking a moving body, including two electric motors and a planetary gear device having a sun gear, at least one planetary gear and a ring gear, wherein the two electric motors are connected to two members of the planetary gear device and the third member of the planetary gear device rotates an output shaft which operates a friction member driving device to move a friction member for braking the moving body.

Electrically operated brake including two electric motors connected to

Electrically operated parking brake apparatus for a vehicle, including a parking brake device provided for each of at least one vehicle wheel, an electrically operated driving unit for activating the parking brake device, an operating force holding mechanism for mechanically maintaining an operating force of the parking brake device while the driving unit is off, and a parking brake control device for supplying electric power to the driving unit to activate the parking brake device and then cutting a supply of the electric power to the driving unit, for thereby applying a parking brake to the vehicle, wherein the parking brake control device includes an actual operating force changing device operable while a manually operated drive power source switch provided for turning on and off a vehicle drive power source is placed in the non-operated position, for supplying electric power to the driving unit so as to change an actual value of the operating force of the parking brake device, and then cutting a supply of the electric power from the driving unit.

Electrically operated parking brake apparatus having braking force

An electric brake device includes a disc rotor which is rotatable together with a wheel of an automotive vehicle. An output rod is provided to press a friction pad onto the disc rotor so as to exert a braking force on the wheel. A brake motor is provided to generate a rotating force in response to an electric signal. A gear mechanism is provided to axially move the output rod relative to the disc rotor in accordance with the rotating force, such that the output rod is moved toward the disc rotor when the brake motor rotates in a forward direction, and the output rod is separated from the disc rotor when the brake motor rotates in a reverse direction. A load detection unit detects a load acting on an end of the output rod opposite to a position where the output rod presses the friction pad onto the disc rotor. A motor deceleration unit decreases the rate of rotation of the brake motor when the load detected by the load detection unit is above a reference level.

Electric brake device

A hydraulic braking apparatus for braking a vehicle wheel, wherein a pressure control valve is disposed between a master cylinder and a wheel brake cylinder, and between a reservoir and a hydraulic pressure source which is independent of the master cylinder and whose pressure is applied as a braking pressure to the wheel brake cylinder for braking the wheel. The pressure control valve controls the braking pressure as a function of the master cylinder pressure which is generated by the master cylinder, depending upon the operating force acting on a brake operating member. An electrically controlled pressure regulating device is provided for applying an electrically controlled force to the pressure control valve, to thereby regulate the braking pressure to be applied to the wheel brake cylinder.

Hydraulic braking apparatus having hydraulic pressure control valve and

Shift control system for vehicular automatic transmission

An electrically controlled brake system including a brake operating member, a first detector for detecting an operating amount of the brake operating member, a braking device braking a wheel of a vehicle, a second detector for detecting an actual braking effect provided by the braking device, and a controller for controlling the braking device. The second detector detects the actual braking effect in the form of a positive value when the vehicle is running in one of a forward and a backward direction, and in the form of a negative value when the vehicle is running in the other of the forward and backward directions. The controller determines a positive value as a target braking effect based on the detected operating amount of the brake operating member, and controls the braking device such that an absolute value of the detected actual braking effect coincides with the positive value of the determined target braking effect.

Electrically controlled vehicle brake system having means for

A tandem master brake cylinder has first and second pistons, each piston associated with a fluid chamber and a pressure chamber. The pistons are displaced in response to actuation of a brake pedal. A hydraulic booster is coupled to a power source and is operable to enhance the piston movement and for conducting pressurized fluid to a second of the fluid chambers associated with a second piston to displace that piston in a manner reducing the volume of the pressure chamber associated with the first piston. In the event that a negative pressure is communicated with the second fluid chamber, e.g. by a loss of pressurized fluid from the power source, brake fluid is supplied through a one-way check valve to the second fluid chamber to prevent the negative pressure from reversing the motion of the second piston.

Hydraulic brake booster system with check valve in brake fluid reservoir

A hydraulic braking system includes a tandem master cylinder having a bore with an opening and a closed wall at opposite ends thereof which formed in a housing, a first piston slidably fitted in the bore so as to define a first pressure chamber and a first fluid chamber therein and operatively connected to a brake pedal, a second piston slidably fitted in the bore so as to define a second fluid chamber adjacent to the first pressure chamber and a second pressure chamber and operatively connected to the first piston. A normally open valve communicates with each piston so as to close passages formed in the each pistons and communication between each fluid chambers and each pressure chambers, respectively, when each piston is moved in response to the depression of the brake pedal. A power source generates a hydraulic power pressure. A dynamic hydraulic braking pressure generator generates the hydraulic power pressure supplied from the power source in response to depression of the brake pedal and outputs to the second fluid chamber. A plurality of wheel cylinders for braking respective road wheels are divided into a first group of wheel brake cylinders communicated with the first pressure chamber through one of dual hydraulic circuits and a second group of wheel brake cylinders communicate with the second pressure chamber through an another of the dual hydraulic circuits. A restrictor restricts the sliding distance of the second piston toward the first piston to at least a predetermined distance for closing the valve means. Due to such construction, the first stage idle stroke of the tandem master cylinder is shortened and the stroke of the brake pedal is shortened.

Hydraulic braking system

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Mishima, Japan

Kenji Shirai