Toyota Jidosha Kabushiki Kaisha

Advics Co., Ltd.

Michio Akiyoshi

Kiyoyuki Uchida

Yoshiaki Tsuchiya

Satoshi Udaka

Chiaki Hamada

Junji Mizutani

A signal indicating an estimated body deceleration and a deceleration indicated by a detection signal from a G sensor are pass through first and second filters having different filter constants. Based on a resulting difference in response speeds thereof, it is determined whether sudden braking, i.e., quick depression, is being performed. If quick depression is determined, then even if an upper limit of a W/C pressure to rear wheels is set in order to prevent rear wheel locking precedent to front wheel locking, the W/C pressure is increased so as to exceed such an upper limit. Thus, a greater deceleration can be achieved than when the W/C pressure at the set upper limit is generated.

Braking force distribution control device

Control system for controlling an anti-lock braking system having a brake for a wheel of a motor vehicle, wherein a skidding or locking condition of the wheel is detected by a detector based on a running condition of the vehicle and a rotating condition of the wheel, and a slip ratio of the vehicle is maintained within an optimum range by a pressure-regulating device, by increasing, decreasing and holding a brake fluid pressure applied to the brake, in response to the detected locking condition of the wheel. A predetermined pressure-decrease time during which the fluid pressure is decreased is measured by a measuring device, and a deceleration rate of a rotating speed of the wheel when the pressure-decrease time has elapsed is detected by a detecting device. A device is provided for determining an extension time during which the fluid pressure is further decreased, such that the extension time increases with the detected deceleration rate of the wheel. The pressure-regulating device is activated to further decrease the fluid pressure for the determined extension time.

Vehicle braking system for drive wheels, having means for determining a

A dual-circuit hydraulic anti-lock braking system for an automotive vehicle having a first and a second group of wheels, including (a) a dual-circuit hydraulic braking device including a first and a second brake circuit which are independent of each other, (b) a wheel rotating condition detecting device; (c) a vehicle running condition detecting device; (d) a regulating device for regulating each of a first and second braking pressures transmitted by the first and second brake circuits, respectively, by decreasing or increasing the braking pressure for a duration of time, when the detected rotating condition of at least one wheel of each of the first and second wheel groups is brought into a predetermined relationship with the detected running condition of the vehicle so as to apply the regulated pressure to a brake cylinder associated with the wheel whose detected rotating condition is brought into the predetermined relationship with the detected running condition of the vehicle. The system further including (e) a failure detecting device for detecting a failure of each of the first and second brake circuits; and (f) a time setting device for determining the duration of time at a first value when no failure is detected, and at a second value different from the first time value when a failure is detected.

Dual-circuit hydraulic anti-lock braking system

An antiskid type brake system for vehicles including brakes, actuators, rotation sensors for monitoring the speeds of rotation of wheels, a controller, fluid pressure sensors and an upper limit value setter. The upper limit value setter sets an upper limit value of deceleration in such a manner that the upper limit value is set at a high level when the fluid pressure is high and at a low level when the fluid pressure is low, based on the fluid pressure sensed by the fluid pressure sensor associated with a wheel whose speed of rotation has been determined by the associated rotation sensor to be the highest of all the speeds of rotation of the wheels.

Growing community of inventors

Susono, Japan

Michio Akiyoshi