Nissan Motor Company Limited

Unisia Jecs Corporation

Shinji Katayose

Minoru Tamura

Toru Iwata

Hideaki Inoue

Akira Takei

Takashi Oka

Terukiyo Murakami

Masamichi Imamura

Mitsuharu Hamada

Hiromichi Uchiyama

Masatsugu Ohwada

Hitoshi Kubota

Jun Kubo

Hiroyuki Asano

Junsuke Kuroki

Shuuji Torii

Yoshiaki Yokota

Yukiyoshi Hatori

Hisashi Izumi

Yukiyoshi Sasabe

Hiroshi Sugiyama

Shigeru Tanisawa

A vehicle dynamics control system for an automotive vehicle with a diagonal split layout of brake circuits comprises a tandem master cylinder, two hydraulic pumps each fluidly disposed in one of the two brake circuits, selector valves for selecting a brake-fluid pressure to be fed to a first brake line and for selecting a brake-fluid pressure to be fed to a second brake line, a plurality of pressure control valves for regulating a fluid pressure in each individual wheel-brake cylinder, vehicle sensors for detecting a vehicle's cornering behavior, and a control unit being responsive to the sensor's input information for controlling the respective valves. The control unit operates to supply the fluid pressure generated from the pump to an inner front wheel-brake cylinder in the vehicle understeer on turns. The control unit also operates to supply the fluid pressure generated from the pump to an outer front wheel-brake cylinder in the vehicle oversteer on turns.

Vehicle dynamics control system

A vehicle dynamics control system for an automotive vehicle with a parallel split layout of brake circuits comprises a tandem master cylinder, a hydraulic pump fluidly disposed in one brake circuit, a selector valve for selecting a brake-fluid pressure to be fed to a first brake line from between the fluid pressure generated from the pump and the master-cylinder pressure, a plurality of pressure control valves for regulating a fluid pressure in each individual wheel-brake cylinder, vehicle sensors for detecting a vehicle's cornering behavior, and a control unit being responsive to the sensor's input information for controlling the respective control valves associated with the front wheel-brake cylinders. The control unit operates to supply the fluid pressure generated from the pump to an inner front wheel-brake cylinder in the vehicle understeer on turns. The control unit also operates to supply the fluid pressure generated from the pump to an outer front wheel-brake cylinder in the vehicle oversteer on turns.

In apparatus and method for stability controlling a vehicular attitude for a vehicle, a slip angle (BETA) of a vehicle body to a vehicular forwarding direction is derived on the basis of a detected yaw rate, a derived vehicle body speed, and a detected lateral acceleration acted upon the vehicle body, a controller determines whether an oversteer condition occurs and/or determined whether an understeer condition occurs, and a braking liquid pressure from a control purpose liquid pressure source is supplied through one of two braking pressure distribution conduits so as to give a braking force to be applied to one of front left and right road wheels which is directed to suppress a yaw moment when the oversteer condition occurs. When the understeer condition occurs, the liquid pressure in the control purpose liquid pressure source is supplied to one of the two braking distribution conduits so as to give the braking force to be applied to one of the front left and right road wheels so as to develop the yaw moment.

Apparatus and method for stability controlling vehicular attitude using

A traction control system monitors wheel slippage and variation of wheel slippage for detecting road friction condition. The traction control system selects brake control characteristics depending upon the detected road friction condition.

Traction control system for controlling engine output and brake for

A slip control system employs a plurality of slip control characteristics which may be provided as form of maps. One of the maps is selected depending upon wheel slippage in such a manner that a map having a greater engine speed variation rate with respect to variation of an accelerator position is selected while the wheel slippage is maintained smaller than a predetermined target slippage, and a map having a smaller engine speed variation rate is selected while wheel slippage is greater than the predetermined target slippage. The selected map is compared with a map previously selected at a preceding timing which is variable depending upon a lag time of engine response.

Slip control for automotive vehicle with variable engine speed variation

A slip control system monitors variation of engine speed for detecting transition from engine accelerating condition to decelerating condition during slip control mode operation, in which engine speed is adjusted for reducing output torque for reducing magnitude of wheel slippage. Slip control mode operation is terminated when engine transition from the acceleration state to deceleration state is detected.

Automotive slip control system with high response characteristics in

A system and method for controlling a rotation of drive wheels for a vehicle in which a slippage (slip rate in percentage) between the drive wheels and a road surface on which the vehicle runs is calculated on the basis of a drive wheel rotation speed and a vehicle body speed, a plurality of different predetermined slippages, each representing a magnitude of a slip occurrence are stored, and a plurality of different characteristic graphs, each representing a relationship between opening angles of a first throttle valve associated with an accelerator and of a second throttle valve installed in series with the first throttle valve in an intake air passage of a vehicular engine are stored. Then, one of the characteristic graphs is selected to use the control of the opening angle of the throttle valve according to a change of the slip occurrence in such a way that when the slippage increases and exceeds one of the predetermined slippages, the opening angle of the second throttle valve is decreased toward its fully close position with respect to that of the first throttle valve and when the slippage decreases and becomes below one of the predetermined slippages, the opening angle of the second throttle valve is increased with time toward its original fully open position.

System for controlling rotation of drive wheel for vehicles and method

A traction control system is associated with a vehicular brake system which can control braking force for respective individual driving wheel independently of each other on the basis of an average wheel slippage data. The average wheel slippage data is derived introducing weighing technology giving higher weight for wheel slippage on a driving wheel, on which occurring smaller wheel slippage in comparison with the other. The traction control performs control of application of braking force for respective driving wheel independently of each other so that wheel traction recovering efficiency at respective driving wheel can be optimized.

Traction control system for automotive vehicle

A system and method for electronically controlling a vehicular engine operation in accordance with an accelerator operation which can utilize a system for automatically controlling a vehicle speed to a set cruising speed are disclosed in which an operating variable selection mechanism which selects and outputs one of operating variables whose value is larger than the other operating variable, the operating variables being derived from an accelerator and from an actuator of the automatic vehicle cruise controlling system is installed. The selected operating variable of the operating variable selection mechanism is detected by means of an accelerator sensor. A throttle actuator is controlled for driving the throttle valve toward the direction in which an opening angle of the throttle valve coincides with a target opening angle which is defined by a detected variable of the accelerator sensor. A limiter provided for limiting a maximum opening angle of the throttle valve is driven by means of a limiter driving mechanism toward the angular position of the throttle valve corresponding to the selected operating variable of the operating variable selection mechanism and is held thereat against the driving force of the throttle actuator by means of a limiter holding mechanism.

System and method for electronically controlling a vehicular engine

An apparatus for controlling the angular displacement of a throttle valve for an automotive vehicle includes a return spring attached to the rotational axis of the throttle valve which biases the rotational axis of the throttle valve towards its fully closed position, and which automatically moves the throttle valve to its fully closed position without excessive wear on the throttle valve or on a throttle chamber.

Apparatus for controlling angular displacement of a throttle valve for

A system and method for controlling the opening angle of a throttle valve installed within an engine for a vehicle, in which the rate of change of the opening angular position of the throttle valve is calculated as a substantially cubic function of a relative rate of change in an angular position of an accelerator pedal, so that the speed of vehicle is held approximately constant when there is no consistent change in the angular position of the accelerator pedal and the speed of vehicle changes quickly as the rate of change of the angular position of the accelerator pedal increases.

System and method for controlling the opening angle of a throttle valve

An apparatus responsive to a change in the position of an accelerator pedal for controlling movement of a throttle valve situated within an induction passage. The apparatus includes a control circuit which determines new and minimum values for the position of the accelerator pedal and determines a demand value corresponding to a setting of the position of the throttle valve as a function of the difference between the new and minimum values. The control circuit substitutes the new value for the minimum value when the accelerator pedal remains released and placed at the same position for a predetermined time.

Apparatus for throttle valve control

An apparatus for controlling movement of a throttle valve in response to a change in the position of an accelerator pedal. The apparatus includes a control circuit powered from a power source through an ignition switch for determining a value corresponding to a setting of the position of the throttle valve. A throttle actuator is connected to the control circuit for moving the throttle valve to the determined setting. A device is provided to retain the control circuit powered from the power source until the throttle actuator returns the throttle valve to its closed position after the ignition switch is turned off.

An engine control apparatus comprises a first control circuit for terminating delivery of fuel to the engine upon the occurrence of two conditions; namely, when the throttle valve opens at an angle less than a predetermined value and the transmission is in high gear or in neutral. The apparatus also comprises a second control circuit for restarting the engine when the three conditions are fulfilled; namely, when the transmission is in low gear, the engine is operating at a speed less than a predetermined value, and the clutch is disengaged.

Engine control apparatus

An engine control apparatus comprises a fuelcut control circuit for terminating delivery of fuel to the engine when the throttle valve opens at an angle less than a predetermined value and the transmission is in high gear or in neutral. The apparatus also comprises means for preventing the fuelcut control circuit from terminating fuel delivery to the engine when the pressure stored in a brake booster increases to a level insufficient for application of braking to the vehicle.

Growing community of inventors

Tokyo, Japan

Shinji Katayose