Abstract: A vehicle transmission system has an internal lever for changing transmission gears, a select actuator for moving the internal lever to neutral positions N1, N2, N3 in a first direction, a shift actuator for moving the internal lever to 1st-5th gear positions and a reverse position in a second direction substantially normal to the first direction, and a clutch actuator for actuating a clutch. While any one of the actuators is in operation, the pressure of a fluid discharged from the operating actuator is prevented from acting on the select actuator and/or the shift actuator which is not in operation by applying a fluid pressure to the inoperative select actuator and/or the shift actuator to fix the actuator or actuators in a current position against operation, thereby allowing the transmission gears to be changed accurately and smoothly.

Abstract: A method for controlling operation of a throttle valve in an automatic transmission system for automobiles using a microcomputer, including the steps of: (a) detecting an accelerator position, an engine rotational speed, a clutch stroke, a change lever position, an input shaft rotational speed, and a transmission gear position by a transmission gear position sensor; (b) comparing the data determined in step (a) with a predetermined transmission map and a throttle valve operation speed map each stored in a memory of the microcomputer, and calculating the throttle valve operation speed for various driving conditions; and (c) controlling the operation of the throttle valve through a throttle actuator based on a control signal generated from the throttle valve operation speed map.

Abstract: Herein disclosed is a method of controlling an automatic clutch when starting to move a vehicle such as an automobile having an automatic transmission. The maximum accelerating r.p.m. of an engine at the start is detected and stored so that a clutch actuator is kept deenergized to leave the clutch released, while the engine r.p.m. detected is lower than the maximum value stored, but is energized again to apply the clutch when the engine r.p.m. exceeds the maximum value. More specifically, the running state of the vehicle is detected to determine the operating speed of the clutch actuator, and the automatic clutch is applied at the operating speed deterined. The engine r.p.m., once the vehicle is moving is detected and compared with the maximum accelerating engine r.p.m. Then, the operating speed of the clutch actuator is dropped to zero to interrupt engagement of the clutch while the engine r.p.m. detected is smaller than the maximum engine r.p.m. Engagement of the clutch is restored when the engine r.p.m.

Abstract: A method of controlling a shifting operation of a synchro mesh type automatic transmission in a vehicle, such as an automobile. The method includes the steps of (i) detecting the running state of the vehicle, (ii) determining an optimum gear position from the vehicle running condition, (iii) determining if the optimum gear position is higher than a gear position of the transmission, (iv) determining if the engine torque is greater than or equal to a predetermined value and reducing the engine torque below the predetermined value, if the optimum gear position is higher than the gear position of the transmission, (v) disengaging a clutch to disconnect an engine and the transmission, (vi) shifting the transmission to the optimum gear position, and (vii) engaging the clutch. Moreover, the engine torque is reduced before the clutch is released--by reducing the fuel supply to the engine--so that abrupt decelerations and declutching shocks caused by conventional shifting methods are not felt by the driver.

Abstract: A method of controlling the gear changing operation of an automatic transmission includes determining an optimum gear position based on a car speed and an extent of depression of an accelerator pedal to control a gear transmission to select the optimum gear position, and selecting neutral when the determined optimum gear position is lower than a selected gear position at the time the accelerator pedal is released, to interrupt the gear changing operation until the accelerator pedal is depressed.

Abstract: A diagnostic processing system for the automatic transmission of an automobile to cooperate with an instruction element for producing an actuation signal for driving the transmission gears and clutch. The system is chiefly comprised of a gear position sensor which senses the gear position of the transmission gears and a diagnostic check element which determines, based on a gear position signal from the sensor and other information regarding the automobile's operation, the validity of the actuation signal.

Abstract: An electronically controlled vehicle transmission has a gear shifting operation which is controlled by determining an optimum transmission gear based on shift map data stored in an electronic control device, a detected vehicle speed and a detected degree of depression and speed of movement of an accelerator pedal. If the accelerator pedal is abruptly depressed while the vehicle is running, such an abrupt depression is detected by a pedal speed detector which produces a signal to cause an electronic control device to interrupt the gear shifting operation. The electronic control device starts the gear shifting operation again after the accelerator pedal depression is stabilized.

Abstract: A method of controlling the starting of a vehicle having an engine, an automatic clutch and an electronic control system which detects the extent of depression of an accelerator pedal and determines the speed of operation of a clutch actuator based on the detected extent of depression of the accelerator pedal. In particular, the method includes detecting a load on the engine due to a change in the condition in which the clutch is engaged, and stopping connection control of the clutch when the detected load on the engine is increased, to prevent an engine stop. In addition correction is made to vary the speed at which the vehicle starts linearly with respect to the extent of depression of the accelerator pedal.

Abstract: An automatic clutch control system including a clutch, a clutch actuator for controlling a clutch stroke, a plurality of solenoid valves for controlling the clutch actuator, a clutch stroke sensor for measuring the clutch stroke, a control unit for feeding back a stroke signal detected by the clutch stroke sensor and for controlling the solenoid valves to control clutch engagement and disengagement. The control unit includes a learning control section for storing a full clutch engagement point upon saturation of the stroke signal in a clutch engagement operation and storing clutch contact point upon start of rotation of an engine input shaft in a clutch engagement operation following a clutch disengagement operation. Based on the full clutch engagement point and clutch contact point, the control unit judges a clutch operation range for control of clutch engagement and disengagement.

Abstract: An electronic control method for vehicles, wherein, when exercising control to start a vehicle from rest, the vehicle engine and clutch are controlled in a very low speed control mode, if the amount by which an accelerator pedal is depressed is less than a set value. If, however, the amount of accelerator pedal depression is greater than the set value, the engine and clutch are controlled in an ordinary start control mode. When the vehicle is travelling and the speed thereof is less than a set value, the clutch is controlled in a start control mode. When the travelling speed of the vehicle is greater than the set value, the clutch is controlled in a shift mode.

Abstract: The invention is an internal combustion engine fuel control apparatus including a movable member for controlling the supply of fuel to the engine, the member being movable in one sense to increase fuel flow and movable in an opposite sense to decrease fuel flow; a control mechanism producing a variable level output for controlling the engine; an operator controlling movement of the movable member in response to the level of the output; an initiator coupled to the movable member and the operator and operative to initiate control of the movable member by the operator at a given level of the output; an adjustment means for adjusting the given level of the output; a bias element biasing the movable member in the opposite sense; and an idle set means for establishing an adjustable mechanism degree of movement of the movable member in the opposite direction.

Abstract: An automatic clutch control system, for use in automobiles, using a microcomputer. Included in the system are an accelerator pedal sensor for detecting accelerator position; an engine speed sensor for detecting engine speed; a clutch stroke sensor for detecting clutch stroke; and an automobile speed sensor for detecting automobile speed. The microcomputer is included in a controller for controlling opening or closing of solenoid valves, gear change of a transmission, and opening or closing of a throttle actuator, based on predetermined stored data and based on signals transmitted from the sensors. The automatic clutch control system consequently can automatically control the clutch moving time and clutch moving speed for easy driving under all driving conditions. Moreover, while the clutch control system is fully automatic, it can use dry-type single-plate clutches and sliding-mesh-type transmissions as in manual and semiautomatic transmissions.