Toyota Jidosha Kabushiki Kaisha

Fujitsu Ten Limited

Fujitsu Ten Kabushiki Kaisha

Tetsuya Tada

Tatsuo Teratani

Masumi Nagasaka

Junji Takahashi

Hiroaki Tabuchi

Akira Miyazaki

Kiyoshi Yagi

Takayoshi Nakatomi

Masaki Hitotsuya

Hiroharu Miyazaki

Kouji Iwamoto

Kenji Kondo

Kuhihisa Hayashi

A slip control device for a vehicle provided with an internal combustion engine, wherein an engine output torque is controlled independently of a depression of the accelerator pedal so that slip at the driving wheels of the vehicle is controlled. A stand-by means is provided and operates, upon a prediction of an occurrence of slip at the vehicle wheels, to close the throttle valve to a stand-by degree of opening thereof before the occurrence of the slip. The stand-by degree of opening of the throttle valve is controlled in accordance with an engine torque of the engine when the occurrence of slip is predicted. Thus the occurrence of slip is effectively prevented and a good acceleration performance obtained.

Traction control system for a vehicle with an internal combustion engine

An automatic speed control apparatus for vehicles for controlling speed with good responsiveness and without delay at the start. An actuator opens and closes a throttle valve independently of an accel pedal, and a link connects the throttle valve and the actuator. A speed sensor detects the vehicle speed and a speed control mechanism controls the actuator so that the vehicle speed from the speed sensor is maintained at a predetermined speed. The amount of idle working of the actuator caused by the play of the link when the throttle valve is opened by the actuator is detected and the detected amount of idle working is added to the amount of control of the speed control mechanism as an amount of offset working in the direction in which the throttle valve is opened.

Speed control apparatus with compensation for actuator link play

A control device for maintaining a constant speed of an automobile, having an internal combustion engine with a throttle valve and an actuator for the throttle valve. A degree of opening of the throttle valve is decided to bring the speed of the automobile to a desired set speed, corrected in accordance with running conditions by cyclically repeating an integral calculation at a first pattern to provide an integral correction value when a difference exists between the detected speed and the set speed. This integral correcting value is quickly returned at a second pattern greater than the first pattern when the integral correction value becomes greater than a predetermined value and the relationship between the detected speed and the set speed is reversed.

Control device for maintaining constant speed of an automobile

A constant-speed control device for a vehicle including a fuel cut device and a suspending device which suspends a fuel cut operation. An actuator is provided for controlling a throttle valve so that the vehicle runs at a constant speed. The fuel cut device carries out a fuel cut when the degree of opening of the throttle valve is smaller than a predetermined value. The suspending device suspends operation of the fuel cut device until the vehicle speed becomes higher than a target value by a predetermined value.

Constant-speed control device for a vehicle

An automatic speed control apparatus for controlling the running speed of a vehicle at a constant set speed includes an auxiliary intake passage providing direct communication between portions of a main intake passage upstream and downstream from a throttle valve so as to bypass the throttle valve, an auxiliary intake air valve adapted for controlling the flow rate of air in the auxiliary intake passage, and a fuel supply cut-off means for suspending the supply of fuel to the engine from a moment at which a fuel supply cut-off condition is met, which requires the throttle valve to be set at the minimum opening position and the engine speed to be higher than a predetermined fuel supply cut-off engine speed, until the moment at which a predetermined fuel supply recovery condition is met. An actuator for actuating the throttle valve is controlled so as to vary the degree of opening degree of the throttle valve and enable the vehicle to run at the constant set speed. The auxiliary intake air valve is controlled in such a manner that the flow rate of air in the auxiliary intake passage is reduced before the fuel supply cut-off condition is met during motion of the vehicle under the control of the automatic driving apparatus. The rate of fuel supply to the engine has therefore been reduced before the fuel supply is actually cut-off so that the amount of change in the engine output torque and, hence, the level of shock produced by the change in the engine output torque are reduced when cut-off of the fuel supply is executed.

Automatic speed control apparatus for controlling vehicle speed at set

A cruise control system for a vehicle having an internal combustion engine provided with a throttle valve operated by a diaphragm actuator irrespective of a depression of an accelerator pedal by an operator of the vehicle. The system is provided with a system for controlling a vehicle speed in a so-called 'dead zone' where hunting usually occurs if a normal feedback control is executed. A time-interval integrating unit is provided for integrating the deviation of the acutal speed with respect to the target speed with a time interval as well as a weight factor, so that the integrated value corresponds to the change in the deviation in the dead zone. The integrated value is compared with a predetermined value corresponding to a change in the vehicle speed which is obtainable when the least significant bit in the control signal output to the actuator is changed. When the integrated value becomes equal to or higher than the predetermined value, the least significant bit is incremented or decremented, and thus speed control in the 'dead zone' becomes possible.

Cruise control system for a vehicle

A cruise control system for a vehicle having an internal combustion engine is provided with a throttle valve operated by a diaphragm actuator irrespective of a depression of an accelerator pedal by an operator of the vehicle. The system is provided with a control circuit for controlling an electric signal applied to the actuator. A fixed level signal is first applied to the actuator for a short period after a cruise mode operation has commenced, so that the diaphragm is quickly moved to prevent a temporary decrease in the vehicle speed. After the elapse of the predetermined time, the level of the electric signal is controlled by feedback so that the vehicle speed is controlled to a target speed. A feedback gain initially has a first value for a period after the feedback control is commenced and then has a second value which is smaller than the first value. Furthermore, the feedback gain may have a third value at a transient state from a condition where the feedback gain has the first value and a condition where the feedback gain has the second value.

Growing community of inventors

Anjyo, Japan

Tetsuya Tada