Nissan Motor Company Limited

Hitachi, Ltd.

Unisia Jecs Corporation

Kayaba Kogyo Kabushiki Kaisha

Sunao Hano

Naoto Fukushima

Yohsuke Akatsu

Yukio Fukunaga

Hirotsugu Yamaguchi

Masaharu Satoh

Shinji Matsumoto

Hideaki Inoue

Masaharu Sato

Jun Kubo

Itaru Fujimura

Nobuyuki Ohtsu

Kazunobu Kawabata

Shinichi Matsui

Gen Inoue

Kazuroh Iwata

Eiji Yagi

Tamotsu Yamaura

Hideto Murakami

Shin Takehara

Yosuke Akatsu

Masaru Sugino

Yousuke Akatsu

Masahiro Nakamizo

Tomoaki Fujibayashi

Hiroshi Yamanaka

Shunichi Inoue

Yoshiki Tsuda

A brake control apparatus includes a vehicle sensor to sense a vehicle condition, and a control unit to start a hill hold control to hold a vehicle in a stop state by a braking force produced by a brake actuator even after an end of the driver's braking operation, in accordance with a hill hold control start adjustment parameter determined from the sensed vehicle condition. The parameter may be a variable indicative of a gradient of a road.

Brake control apparatus and method

An automotive brake control system with an anti-brake skid (ABS) unit which controls a wheel-brake cylinder pressure to each individual wheel cylinder of the road wheels to prevent a wheel lock-up condition during braking, and an ABS control unit being configured to be connected electrically to at least wheel speed sensors and the ABS unit to execute skid control having at least a reduce-pressure operating mode and a pressure build-up operating mode, when the wheel speed sensor signals indicate that at least one of the road wheels is locking up. The ABS control unit includes a road-surface-condition change determination section which determines, based on both a time length of brake-fluid-pressure control continuously executed during the skid control and a recovery acceleration of the wheel speed of the road wheel subjected to the skid control, whether there is a road-surface &mgr; change from low-&mgr; road to high-&mgr; road.

Automotive brake control system with anti-skid braking device

A vehicle turning behavior control apparatus for use with a multi-wheel automatic vehicle. The apparatus provides a difference between the braking forces applied to the nearside and offside wheels of the vehicle to produce a yaw moment in a direction to which the vehicle turns. The difference is determined based upon the vehicle steering angle and is modified based upon the vehicle steering speed.

Vehicle turning behavior control apparatus

A vehicle turning behavior control apparatus for use with a multi-wheel automatic vehicle. The apparatus provides a difference between the braking forces applied to the nearside and offside wheels of the vehicle to produce a yaw moment in a direction to which the vehicle turns. The difference is determined based upon the vehicle steering angle and is modified based upon the vehicle lateral slip angle.

In order to improve the cornering of a vehicle under braking, control is based on the single angle and the rate at which the steering angle is changing. When the rate at which the steering angle is changing is high the braking force on the outboard side of the vehicle with respect to the direction in which it is turning, is reduced with respect to that on the inboard side while in the case that the steering angle is relatively large, the braking force on the inboard side is reduced with respect to that on the outboard side. As an alternative to brake force reduction, it is possible to increase the braking force on the side opposite to that wherein reduction would be implemented. Parameters which are used to weight the control are steering angle acceleration, which speed, and vehicle deceleration.

Vehicle brake system including cornering characteristic control

An actively controlled suspension system includes a vehicular rolling detecting component to adjust the suspension characteristics for suppressing the vehicular rolling. In addition, the actively controlled suspension control system may be provided for adjusting roll-stabilization load distribution between the front and rear suspension systems for adjusting vehicular driving stability by suppressing rolling and pitching of the vehicle body.

Actively controlled automotive suspension system with adjustable

A vehicle turning behavior control system is mounted in an automotive vehicle having an anti-skid braking system. The control system has an electronic control unit to which a signal representative of a vehicle turning condition is input. The control unit is arranged to establish a difference between braking forces applied respectively to inside and outside wheels (with respect to a vehicle turning direction) in accordance with the turning condition representative signal so as to develop a yaw moment between the inside and outside wheels to promote a turning of the vehicle. The control unit also functions to control the braking force applied to the outside wheel in accordance with the braking force applied to the inside wheel by the anti-skid system in a manner such that the former braking force changes in a similar pattern to the latter braking force.

Vehicle turning behavior control system

An actively controlled suspension system employs a pressure control valve which is operable in response to a control signal and controls fluid pressure in the fluid chamber of a hydraulic cylinder as a replacement for the conventional hydraulic shock absorber. The pressure control valve is associated with a controller which detects bounding and rebounding acceleration and stroke speed in bounding and rebounding motion for deriving a control signal to operate the pressure control valve to absorb vibration energy to be transmitted between a vehicle body and a suspension member.

Actively controlled automotive suspension system with improved damping

An actively controlled suspension system has two hydraulic systems for generating damping force against the vibration to be transmitted between a vehicle body and a suspension member. One of the hydraulic systems is designed for absorbing relatively high frequency vibration generally input from the suspension member for preventing vibration from the suspension member from being transmitted to the vehicle body. The other hydraulic system is active on relatively low frequency of vibration generally input from the vehicle body upon change of attitude of the vehicle body. The other hydraulic system generates a fluid pressure suppressing the attitude change. A pressure control valve and a fluid pressure source may be incorporated in the second hydraulic system so that they may not be active when aforementioned one of the hydraulic system is active.

Actively controlled automotive suspension system with mutually

An actively controlled suspension system introduces two-way mode operation in controlling suspension. A suspension control system operates in a normal mode for controlling fluid pressure in a hydraulic cylinder disposed between a vehicle body and a suspension member is adjusted depending upon the vehicle driving conditions in order to suppress vehicular attitude change, and a power OFF transition mode for controlling the fluid pressure toward a preset neutral pressure. The hydraulic circuit is constructed to maintain the pressure in the working chamber of the hydraulic cylinder at the neutral pressure while power is not supplied to control system.

Actively controlled suspension system with power supply control

An actively controlled suspension system which can perform precise control of suspension characteristics with satisfactory compensation of phase delay caused in a control system. The actively controlled suspension system which can successfully avoid influence of the shifting of the gravity center of a vehicle body caused by a variation of load on the vehicle. The actively controlled suspension system employs more than one lateral acceleration sensor which are oriented at axially or longitudinally shifted positions to each other. Based on the outputs of respective lateral acceleration sensors, anti-rolling suspension control signals are produced for controlling suspension characteristics of the left- and right-sides of a suspension system.

Actively controlled suspension system with compensation of delay in

A suspension control system detects acceleration exerted on the vehicular body and close to a predetermined critical value. When the acceleration greater than the predetermined critical value, total stiffness of the suspension system is adjusted to be smaller value to allow attitude change of the vehicle body in a predetermined magnitude. Therefore, rolling or pitching is caused as a sign that traction of the suspension tends to break. This makes a driver to recognize that the vehicular driving condition is near the critical condition.

Actively controlled suspension system for suppressing attitude change of

A suspension control system introduces capability of automatically adjusting sensibility of attitude change depending upon a vehicular speed with maintaining capability of manual adjustment of the sensibility for the vehicular attitude change. The actively controlled suspension system employs a pressure control valve which is operable in response to a control signal and controls fluid pressure in the fluid chamber of a hydraulic cylinder as a replacement of the conventional hydraulic shock absorber. The pressure control valve is associated with a controller which detects bounding and rebounding acceleration and stroke speed in bounding and rebounding motion for detecting vehicular attitude change and deriving a control signal to operate the pressure control valve to suppress attitude change. The controller is response to a vehicle speed indicative parameter for adjusting sensitivity of attitude change and whereby adjusting suspension control characteristics.

Actively controller suspension system for automotive vehicle for

An anti-skid brake control system is capable of optimizing vehicular braking characteristics in order to minimize the braking distance. The anti-skid brake control system takes a feature of the vehicle speed dependent wheel slippage threshold. For this, the anti-skid brake control system of the invention employs a wheel slippage threshold deriving means which derives a wheel slippage threshold on the basis of a vehicle speed. The wheel slippage threshold is compared with an actual wheel slippage detected on the basis of a vehicle speed and a wheel speed. Brake pressure in a wheel cylinder is reduced when the detected wheel slippage is increased across the wheel slippage threshold.

Anti-skid brake control system with vehicle speed dependent variable

An actively controlled suspension system is provided with a fluid pressure device provided between a vehicle body and a suspension member for suspending the vehicle body on the suspension member. The fluid pressure member is variable at least one of damping characteristics and spring characteristics in linear fashion depending upon relative displacement of the vehicle body and the suspension member in bounding and rebounding directions.

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Kanagawa, Japan

Sunao Hano