According to the present invention, there is provided a device for controlling a motor vehicle installed with an engine and an automatic transmission during a shift in gear positon in the automatic transmission, the automatic transmission having an input shaft drivingly connected to the engine and an output shaft. In the device, an actual value in a speed ratio is accurately detected and thus monitored during a transient period involving a shift in gear position taking place in the automatic transmission, and a closed loop control is effected based on the actual speed ratio detected.

Control for shock-free shift in an automatic transmission

The net engagement pressure of a torque converter clutch having a negative slope capacity vs. slip characteristic is controlled to stably regulate the clutch slip, and thereby isolate engine torque perturbations from the vehicle driveline. The pressure is scheduled with a proportional term responsive to transient slip speed deviations and an integral term responsive to steady state slip speed deviations. Feed forward terms responsive to the throttle changes which force steady state slip speed deviations act to increase the speed of response of the integral term.

Gain scheduling technique for a closed loop slip control system

A driving power control system for a vehicle which minimizes the shock due to a gear change by keeping a driving force constant throughout the shifting, resulting in high drivability. The system includes a mechanism for controlling the engine power to keep driving force unchanged, mechanisms for respectively keeping the acceleration and driving force constant throughout the shifting, and a second throttle valve for controlling the engine power.

Driving power control system

The engine idling speed control system in an internal combustion engine for a vehicle provided with an automatic transmission device. A shift down operation induced for attaining an engine braking effect is detected, and upon detection of such a shift down operation, the idling speed control system is controlled so that the intake air amount is incremented. As a result, an increase in an engine torque is obtained for decreasing shock during a shift down operation executed in an automatic transmission.

System for controlling idling speed in internal combustion engine for vehicle with automatic transmission

PURPOSE:To reduce the rotating speed when fuel is returned by releasing the engagement of a lock-up clutch in advance before fuel is returned and switching and operating a start power generating device as an engine driving motor. CONSTITUTION:When the deceleration state of a vehicle is detected by a deceleration detecting means, a fuel cutting means controls a fuel adjusting means and cuts the fuel feed to an engine, and a lock-up clutch is set to the engagement state or the slip state by a control means. When the vehicle is decelerated end the engine rotating speed detected by a return rotating speed detecting means is lowered to the fuel return rotating speed preset by a return time control means, the fuel feed is resumed by a fuel return means, the return time control means releases the engagement state of the lock-up clutch prior to it, and a start power generating device is switched and operated as an engine driving motor. The return rotating speed can be reduced, and a shock when fuel is returned can be reduced.

Control device for vehicle with automatic transmission

PURPOSE:To reduce a speed change shock tending to increases as engine output increases by making ignition timing of the engine different from the normal one in speed change operation of an automatic transmission so as to reduce the engine output. CONSTITUTION:Since a solenoid 18b is energized in speed change operation, a solenoid valve 18 is opened. Thus, a vacuum diaphragm 14 has a chamber 14a introduced the atmospheric pressure from an air filter 9 in the speed change so that a rotational angle theta of a breaker base 13 is made zero. Thus, ignition timing of the engine is delayed to the extremity in which engine running does not yet produce any troubles so that the output of the engine is reduced and a speed change shock can be reduced.

Speed change shock reducing device for vehicle on which automatic transmission is mounted

PURPOSE:To reduce the speed shift shock of an automatic transmission, by restricting the intake quantity of an engine at the time of shifting of the transmission to a higher speed position. CONSTITUTION:A control valve 10 is provided in an intake passage 9 upstream to a throttle valve 4. Depending on the signals of a first-second shifting signal circuit 12 and a second-third shifting signal circuit 13 or depending on not only said signals but also that of a throttle opening degree judgment circuit 14 in some case, a control circuit 11 opens or closes the control valve 10 to restrict the intake quantity of an engine at the time of shifting of an automatic transmission to a higher speed position.

Device for reducing speed shift shock of automatic transmission

PURPOSE:To prevent hunting in control from occurring and prevent vibration from being generated, by a construction wherein the modulus of elasticity of an elastic member is increased with the relative displacement of an output element and an output shaft in the direction of an opening of a variable orifice CONSTITUTION:When the vehicle velocity is in a slip range, a governor pressure PG moves a lock-up controlling valve 25, the pressure PL inside a lock-up controlling chamber 18 is released through a fixed orifice 26, and a pressure PC is supplied through the variable orifice 19 The pressure PL is determined by the opening of the orifice 19, and the lock-up clutch 16 transmits power in a slip- controlling condition with a converter cover 5 in a degree according to the pressure PL A turbine hub 9 and a sleeve 10 are relatively displaced in accordance with a turbine torque supplied through the elastic member consisting of springs 14, 15, thereby varying a lock-up releasing pressure

Slip controller for torque converter

PURPOSE:To decrease the hysteresis torque by supporting both end parts of an elastic body which connects input and output members in a relatively rotatable manner by the input and output members, and causing the elastic body and input and output members to assume a non-contact state by members other than these support members. CONSTITUTION:An opening 7 for accommodating a spring 5 in the input member 1 and a side plate 3 is formed by providing an offset D on one side with respect to the conventional opening. Further, an opening 8 formed in a disc-shaped part 2a of the output member 2, is formed by providing an offset C on one side with respect to the conventional opening. In conclusion, the input member 1 and the side plate 3 are caused to support a spring 5 only on the side of a line E-E, and the output member 2 is caused to support the spring 5 on the side of a line F-F. Accordingly, the spring 5 does not make contact with the input and output members 1 and 2 by members other than these support members, and no frictional resistance is generated. Hence, the hysteresis torque can be reduced.

Torque transmitting device

PURPOSE:To hold down a vibration level to the lowest possible extent as well as to prevent the combustion of an engine from being deteriorated, by making the amount of slippage in a hydraulic coupling, during partial cylinder operation, smaller than in time of all cylinders being operated. CONSTITUTION:In an engine 1, all-cylinder operation or partial cylinder operation takes place selectively by a computer 6 in a well-timed manner. At engine speed ranges N0-N1 where a vibration level beta during the partial cylinder operation in the engine 1 becomes less than a vibration level alpha during the all-cylinder operation, the amount of slippage in a hydraulic coupling 4 is made to be smaller than in time of the all-cylinder operation during the partial cylinder operation. Therefore, during the all-cylinder operation, these is no fear that the vibration level is raised up due to a short amount of slippage in the hydraulic coupling 4 and that fuel consumption in the engine 1 is deteriorated due to an excessive amount of slippage in the hydraulic coupling 4 during the partial cylinder operation.

Murasugi Taku

Papers

Speed change shock reducing device for vehicle on which automatic transmission is mounted

Device for reducing speed shift shock of automatic transmission

Slip controller for torque converter

Torque transmitting device

Hydraulic coupling slip controller for car mounted with cylinder number variable engine