Unisia Jecs Corporation

Hitachi, Ltd.

Other

Hitachi Automotive Systems, Ltd.

Hitachi Unisia Automotive, Ltd.

Nissan Motor Company Limited

Nobuyuki Ohtsu

Gen Inoue

Atsushi Ishikawa

Toru Kojima

Yoshiyuki Izu

Jun Kubo

Sunao Hano

Hiroshi Tsunehara

Tamotsu Yamaura

Shigeyuki Tanikawa

Masaru Yamashita

A vehicle control apparatus including: a bad-road control-mode switch configured to be manipulated by a driver; and a bad-road control section configured to perform a bad-road control when a bad-road control mode is selected by the bad-road control-mode switch, the bad-road control section including a shift changeover function configured to automatically change a shift state of vehicle between a forward running and a reverse running, and a driving-force applying section configured to reduce a driving force acting on a road-wheel when the shift state of vehicle is changed by the shift changeover function, and configured to apply a predetermined driving force to the road-wheel when a predetermined time has elapsed after the change of shift state, as the bad-road control.

Vehicle control apparatus

A vehicle control apparatus includes a bad-road control-mode switch configured to be manipulated by a driver, and a bad-road control section configured to perform a bad-road control when a bad-road control mode is selected by the bad-road control-mode switch. The bad-road control section includes a braking-force applying section configured to apply a braking force to a drive-wheel, and a driving-force applying section configured to apply a driving force to the drive-wheel which is receiving the braking force from the braking-force applying section, as the bad-road control.

A braking/driving force control apparatus for a vehicle includes a drive wheel configured to be driven by an output of a drive source; a brake unit configured to control a braking force to be applied to the drive wheel, in accordance with a state of the vehicle; and a brake control unit configured to control the brake unit, and configured to reduce a brake torque of the drive source when the brake unit actually applies a braking force to at least the drive wheel of the vehicle.

Braking/driving force control apparatus for vehicle

An antiskid control system for a four-wheel-drive vehicle is arranged to calculate a difference between an average of wheel accelerations of front wheels and an average of wheel acceleration of rear wheels. When the difference is greater than or equal to the vibration determination threshold, the antiskid control system determines that a driveline vibration is generated and executes a control for converging the driveline vibration.

Antiskid control system for four-wheel-drive vehicle

A four-wheel drive control system is provided which comprises a driving force distribution mechanism for transmitting a driving force from a power source to main driving wheels of a vehicle and capable of distributing the driving force to auxiliary driving wheels of the vehicle, a rotational speed difference detector for detecting a rotational speed difference between the main and auxiliary driving wheels, and a driving force distribution controller for controlling a distribution of the driving force to the main and auxiliary driving wheels on the basis of the rotational speed difference, wherein the driving force distribution controller determines a driving force to be transmitted to the auxiliary driving wheels on the basis of an output of the power source, a longitudinal load distribution in the vehicle and the rotational speed difference. A four-wheel drive control method is also provided.

Four-wheel drive control system and method

A traction distribution control system for a 4WD vehicle is constructed to calculate a difference gain in accordance with a difference in spinning state between main driving wheels, and determine a control signal for controlling traction distribution to driven wheels by multiplying a control amount by the difference gain.

Traction distribution control system for four-wheel drive vehicle

In anti-skid control system and method for an automotive vehicle, when a calculated wheel deceleration of any one of road wheels of the vehicle has reached to a predetermined deceleration set on the basis of a pseudo vehicle body deceleration calculated from detected road wheel velocities, an electronic control unit (ECU) suspends a pressure increase control such as to increase a brake liquid pressure of the road wheel corresponding one of wheel cylinders and executes such a pressure hold control as to hold the brake liquid pressure thereof.

Anti-skid control system and method for automotive vehicle

In an antiskid brake control system, an ECU estimates a wheel slip in accordance with a sensed wheel speed and controls a fluid pressure control valve for braking operation in accordance with the estimated wheel slip for an antiskid brake control, the fluid pressure being reduced when the wheel slip is enlarged and being increased when the wheel slip is lowered. When a vehicle-body speed is smaller than a predetermined quick pressure reduction prohibiting speed, the ECU performs a quick pressure reduction prohibiting control to restrain a quick pressure reduction having a greater reduction amount than a predetermined reduction amount.

Antiskid brake control system

In an antiskid brake control system, an ECU is constructed to calculate a pseudo vehicle-body speed in accordance with a sensed wheel speed, calculate a target wheel speed in view of a predetermined slip ratio obtained in accordance with a calculated pseudo vehicle-body speed, carry out pressure reducing control by reducing the fluid pressure within a hydraulic unit when the sensed wheel speed is smaller than the calculated target wheel speed, estimate an amount of fluid stored in a reservoir, and correct the target wheel speed to lessen the slip ratio when the estimated fluid amount is greater than a predetermined value.

An anti-skid control system for an automotive vehicle includes a hydraulic modulator having electromagnetic solenoid valves for regulating a wheel-brake cylinder pressure at each of road wheels. A skid control unit prevents a wheel lock-up condition by controlling the wheel-brake cylinder pressure via on/off reaction of the solenoid valves in response to a pulse signal based on a wheel speed detected by a wheel speed sensor. The skid control unit has a data processing section that generates a desired wheel speed based on the wheel speed, calculates a desired brake-fluid pressure based on an integrated value of a wheel-speed deviation between the desired wheel speed and the wheel speed, sets a controlled ON pulse width based on the desired brake-fluid pressure, and outputting the pulse signal having the controlled pulse width to the solenoid valves after a lapse of a preset pulse width from a previous pulse signal output.

Anti-skid control system for automotive vehicle

An apparatus for determining a road-wheel vibration for an automotive vehicle comprises wheel-speed sensors for detecting wheel speeds of each of road wheels, and a control unit which is configured to be electrically connected to the wheel-speed sensors for processing a wheel-speed data signal detected from each of the wheel-speed sensors. The control unit comprises a wheel acceleration calculating section for calculating a wheel acceleration and a wheel deceleration of each of the road wheels based on the wheel-speed data signal, a wheel acceleration cycle calculating section for calculating a wheel acceleration cycle of each of the road wheels, a vehicle deceleration calculating section for calculating a vehicle deceleration, a vibration detecting section for detecting a road-wheel vibration of the road wheel based on at least the wheel acceleration cycle, and a vibration determining section for determining whether the road-wheel vibration is caused by a bad road surface condition, or the road-wheel vibration is caused by a drive-train vibration of the automotive vehicle, based on the vehicle deceleration.

Apparatus and method for determining a road-wheel vibration of automotive vehicle, and apparatus and method for anti-skid control using the same

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

There is provided a brake control system for carrying out ABS control in which the brake hydraulic pressure is reduced by a brake unit in accordance with a difference between a pseudo vehicle body speed and each of wheel speeds so as to prevent wheel locking. A control unit is configured to detect an abnormality in output of wheel speed sensors, and to determine the pseudo vehicle body speed in accordance with outputs from the wheel sensors except the wheel determined as being abnormal. The control unit determines whether the abnormal wheel is a drive wheel or a non-drive wheel, and to reset the determination of abnormality under conditions differentiated in accordance with whether the abnormal wheel is a drive wheel or a non-drive wheel.

Growing community of inventors

Kanagawa, Japan

Nobuyuki Ohtsu