Aisin Seiki Kabushiki Kaisha

Other

Toyota Jidosha Kabushiki Kaisha

Aisin Seiki K.k.

Hiroshi Toda

Akihito Kusano

Hiroaki Aizawa

Hiroaki Takeuchi

Michiharu Nishii

Nobuyasu Nakanishi

Tadao Saito

Hirochika Shibata

Masashi Sawada

Hideyasu Miyata

Yoshiki Noda

Yoshiyuki Yasui

Eiji Nakamura

Hiroyuki Hattori

Tetsuya Miyazaki

Yoshiharu Adachi

Noboru Noguchi

Tadashi Terazawa

Masamoto Ando

Akihiro Otomo

Toshiaki Hamada

Hiromu Kuromitsu

Fumiaki Kawahata

Masaru Kamikado

Satoshi Yokoyama

Seiichi Kojima

Masahiro Inden

Masahiko Sakabe

Yasuhito Sekihara

Koichi Kondo

Hirohisa Kuwana

Toshiya Shibata

Akinori Okuya

Toru Watanabe

Ryuji Takagaki

Hirokazu Yoshino

An operating characteristics control device for a vehicle includes a physical constitution detecting device for detecting a physical constitution of a passenger, an operation device operated by the passenger, a condition changing device operated by the operation device and changing the condition of the vehicle and an operating characteristic setting device for setting a characteristic showing a relationship between an operating force applied to the operation device and the condition of the vehicle changed by the operation of the condition changing device in response to the physical constitution of the passenger detected by the physical constitution detecting device.

Operating characteristics control device for a vehicle

A braking system including a brake cylinder, a first hydraulic pressure source having a first pump device for pressurizing a working fluid, a second hydraulic pressure source operable in response to an operation of a brake operating member, to pressurize the fluid to a pressure higher than a value corresponding to an operating force of the brake operating member, and a brake-cylinder-pressure control device operable when the brake cylinder is disconnected from the second hydraulic pressure source, to control the pressure of the fluid pressurized by the first hydraulic pressure source, such that the fluid pressure in the brake cylinder is controlled to a value determined on the basis of the operating force, and wherein an emergency communication device is operated when at least one of the brake-cylinder-pressure control device and the first pump device fails to normally function, to hold the brake cylinder in communication with the second hydraulic pressure source.

Braking system wherein brake cylinder is communicated with pedal-operated pressure source upon failure of pump-operated pressure source

A vehicle brake apparatus includes a brake pedal, a wheel brake cylinder operatively mounted on a wheel for applying a braking force to the wheel in proportion to a hydraulic braking pressure, a pressure source for pressurizing brake fluid to generate a hydraulic braking pressure and supply the hydraulic braking pressure to the wheel brake cylinder, and an auxiliary pressure source for pressurizing brake fluid in response to operation of the brake pedal to generate a hydraulic braking pressure and supply the hydraulic braking pressure to the wheel brake cylinder when the pressure source is non-operational. A mechanical valve is operatively mounted between the wheel brake cylinder and the auxiliary pressure source. A first passage is connected between the auxiliary pressure source and the mechanical valve and a second passage is connected between the mechanical valve and the wheel brake cylinder. The mechanical valve permits brake fluid communication between the first and the second passages when the pressure in the first passage is less than a predetermined pressure, and permits brake fluid to flow from the first passage to the second passage when the pressure of the first passage is more than the predetermined pressure.

Vehicle brake apparatus

A brake control apparatus is provided with a simulator for applying a biasing force to a manually operated braking member of a vehicle in response to braking operation. A sensor detects conditions of the vehicle including a braking condition of the vehicle. A first biasing device applies a first biasing force to the manually operated braking member in response to braking operation, and a second biasing device applies a second biasing force, as well. Only one of the first and second biasing devices applies the biasing force to the manually operated braking member when a predetermined condition is detected by the sensor, while both of the first and second biasing devices apply the biasing forces in the normal braking operation. The second biasing device may include a cylinder having a bore defined therein, and a piston slidably received in the bore to define a chamber filled with brake fluid, an elastic member for biasing the piston to expand the chamber, and a reservoir communicated with the chamber of the cylinder for storing the brake fluid drained from the cylinder, and controlled by a controller in response to outputs of the sensor.

Brake control apparatus with a stroke simulator

The present invention is directed to a vehicle braking system having a stroke simulator and a servo device, which includes a pressure generator for generating a hydraulic braking pressure, a wheel brake cylinder operatively mounted on each wheel of the vehicle, a pressure control valve device which is disposed in a passage for communicating the pressure generator with the wheel brake cylinder, to control the hydraulic braking pressure supplied to the wheel brake cylinder, and an electronic controller for controlling at least in response to an amount of operation of the brake pedal. A master cylinder is provided for communicating with the wheel brake cylinder and supplying the hydraulic braking pressure into it in response to operation of the brake pedal, when at least one of the pressure generator, the pressure control valve device and the electronic controller is abnormal. A stroke simulator is connected to the master cylinder, and arranged to allow the brake pedal to advance in response to the amount of operation of the brake pedal. And, a servo device is provided for assisting the master cylinder to operate when at least one of the pressure generator, the pressure control valve device and the electronic controller is abnormal.

Vehicle braking system with a stroke simulator and a servo device

A load transmitting elastic member is interposed between an input rod and a piston of a master cylinder or a piston of a pedal stroke simulator to which the operation force of a brake pedal is applied from the input rod. The set load of the load transmitting elastic member is lower than the predetermined load required for causing the piston to begin to slide and the maximum load of the load transmitting elastic member is higher than the predetermined load required for causing the piston to begin to slide. The stroke of the brake pedal thus begins through application of a small depression force applied to the brake pedal and so the operational feeling of the brake pedal is improved.

Master cylinder device and hydraulic brake device for a vehicle

A vehicle brake control system includes a detecting device that receives a driver's braking intention which is in the form of a physical variable and outputting an electric signal indicating the intention, a vehicle brake device that establishes a brake operation by applying a braking force to a wheel brake device, and a control device that controls the vehicle brake device such that the braking force is in the form of an independent braking force of the electric signal and a dependent braking force on the electric signal at an initial stage and at a successive stage thereof, respectively.

Vehicle brake control system

A brake pressure control device for a vehicle includes a wheel brake, a reservoir, a master cylinder, an accumulator which stores the fluid pressure at a pressure higher than the fluid pressure generated by the master cylinder, and a fluid pump which discharges fluid pressure higher than the fluid pressure in the accumulator. A first fluid conduit connects the master cylinder to the wheel brake, a second fluid conduit connects the fluid pump to the wheel brake, a third fluid conduit connects the fluid pump to the accumulator, a fourth fluid conduit connects the accumulator to the suction port of the fluid pump, and a fifth fluid conduit connects the wheel brake to the reservoir. A first valve opens and closes the first fluid conduit, a second valve opens and closes the second fluid conduit, a third valve opens and closes the third fluid conduit, a fourth valve opens and closes the fourth fluid conduit, and a fifth valve opens and closes the fifth fluid conduit. A foot force sensor detects the force applied to the brake pedal, a vehicle deceleration sensor senses the vehicle deceleration, and a controller estimates a target deceleration of the vehicle based on the foot force detected by the foot force sensor. The controller supplies fluid pressure to the wheel brake by controlling the first valve, the second valve, the fourth valve, the fifth valve and the fluid pump so that the vehicle deceleration agrees with the target deceleration of the vehicle estimated by the controller and controls the third valve and the fluid pump in order to store the fluid pressure in the accumulator.

Brake pressure control device for vehicle

A compact brake pressure controller that can be produced at relatively low cost and which is capable of pressurizing a wheel cylinder quickly through use of a hydraulic pump includes shut-off valves provided between a master cylinder and pressure increasing valves, and suction valves alternatively permitting and preventing brake fluid flow through the suction paths. Restricted passages are also provided between the shut-off valves and the pressure increasing valves. As applied to traction control, when the speed of the driving wheels exceeds the speed of the driven wheels by an amount in the excess of a first predetermined value, the suction valves are opened and the hydraulic pumps are driven to supply brake fluid in the master cylinder to the wheel cylinders. When the speed of the driving wheels exceeds the speed of the driven wheels by an amount in excess of a second predetermined value which is greater than the first predetermined value, the shut-off valves are closed and hydraulic pumps are driven to further supply the brake fluid in the master cylinder to the wheel cylinders.

Brake pressure controller

The present invention aims to provide a fluid pressure control apparatus which allows the gradient of pressure increase to be adjusted finely without using any accumulator. The fluid pressure control apparatus of the present invention includes a hydraulic pump driven by a drive motor and a wheel brake. A first orifice is provided in a passage portion on the side of an outlet of the hydraulic pump. Another passage portion on the side of an inlet of the hydraulic pump is connected to the passage portion between the first orifice and the hydraulic pump through a return passage. A switching valve and a second orifice are connected in series along the return passage. The pressure increase gradient can be set to a small value by changing the amount of fluid flowing into the wheel brake. This is effected, for example, by changing the ratio of the fluid passage area of the first orifice to that of the second orifice, the operational speed of the hydraulic pump, or the duty ratio of the switching valve.

Fluid pressure control apparatus for wheel brakes

A hydraulic brake pressure control system for an automotive vehicle has a primary pressure control circuit including a connecting line for connecting a master cylinder and a wheel brake cylinder. A reservoir holds brake fluid and is connected to a reservoir circuit. A first solenoid valve is disposed in the primary pressure control circuit for selectively closing the connecting line. A second solenoid valve is disposed for selectively connecting a portion of the connecting line between the first solenoid valve and the wheel brake cylinder with the reservoir circuit. The second solenoid valve opens in response to a pressure difference between the primary pressure control circuit and the reservoir circuit when the primary pressure control circuit is evacuated during the initial filling of brake-fluid into the system.

Hydraulic braking pressure control system for an automotive vehicle

A pressure control apparatus includes a first brake pressure control valve for controlling communication between a first wheel brake for applying a braking force to an driving wheel of a vehicle and a pressure generating chamber of a master cylinder and for controlling communication between the first wheel brake and a low back pressure reservoir, and a second brake pressure control valve for controlling communication between a second wheel brake for applying a braking force to a non-driving wheel of the vehicle and the pressure generating chamber and for controlling communication between the second wheel brake and the low back pressure reservoir. A pump draws brake fluid from the reservoir into the first wheel brake and into the second wheel brake through the second control valve. A valve is provided for controlling communication between the wheel brakes and the pressure generating chamber through check valves and for controlling communication between an inlet passage of the pump and the pressure generating chamber. A check valve for blocking fluid flow from the inlet passage of the pump into the reservoir is also provided.

Brake pressure control apparatus

A pressure control apparatus is operated to connect a wheel cylinder to a reservoir via a return fluid passage so that brake fluid will be stored in the reservoir to reduce the pressure. In accordance with the operation of a fluid pressure pump, the brake fluid is discharged from the reservoir into the return fluid passage to supply the brake fluid to the wheel cylinder, so that the wheel cylinder pressure is gradually increased. Based on detection of a sharp decrease of the motor load, it is estimated that the reservoir has become empty. Then, brake fluid is taken from a fluid pressure generating apparatus into the wheel cylinder.

Anti-skid control apparatus

In a hydraulic brake system for a vehicle, the brake fluid in a first wheel brake and the brake fluid in a second wheel brake which are hydraulically connected to a pressure generating chamber of a master cylinder are individually caused to flow into a low back pressure reservoir with the aid of an electromagnetic change-over valve and first and second electromagnetic cut-off valves; and with a pump driven by an electric motor, the brake fluid flowing in the low back pressure reservoir in the above-described manner is caused to flow through a first check valve and a first orifice to the first wheel brake, and through a second check valve and a second orifice to the second wheel brake. With the pump operated, the first and second electromagnetic cut-off valves are individually operated, so that the first and second wheel brakes are individually decreased or reincreased in hydraulic pressure. For traction control, electromagnetic change-over valves provided in bypass passages are operated. Thus, with the system, anti-lock control and traction control can be achieved, and, even when the valves added for traction control become out of order, brake fluid can be supplied to or drawn from the wheel brakes as required.

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Kariya, Japan

Hiroshi Toda