Abstract: A control apparatus of an automated manual transmission includes an input shaft provided with a plurality of drive gears, an output shaft provided with a plurality of driven gears engaged with the drive gears, and a reverse idler gear engaging with gears for backward movement respectively provided at the input and output sides when a backward moving stage is selected, as a mechanism for backward moving. Further, there is provided with a bypass clutch capable of selectively transmitting or shutting a power of the input shaft to the output shaft. When the backward moving stage is selected (S1), the bypass clutch is engaged (S3) so as to stop a rotation of the input shaft (S4), and thereafter, the reverse idler gear and the backward moving gears are engaged with each other (S5). Thus, a shift operation to a reverse mode can be securely and smoothly executed for a short time.

Abstract: A torque converter of a power transmitting apparatus includes a pump impeller connected to a crank shaft of an engine via a front cover, a turbine runner opposing thereto and an input clutch switching a relationship between the turbine runner and an input shaft to an engaged or disengaged state of an automatic transmission. A lockup clutch switched to an engaged or disengaged state with respect to the front cover includes a torsion damper provided between an upstream side plate fixed to the lockup clutch and a downstream side plate, in which a clutch drum is provided with an inertial mass at a downstream side of the torsion damper. Thereby, low-frequency sounds or vibrations in the power transmitting apparatus can be reduced.

Abstract: A control apparatus of a vehicular automated manual transmission includes an input shaft provided with a plurality of drive gears, and an output shaft provided with a plurality of driven gears engaging with the drive gears, in which the drive gears and the driven gears form a plurality of transmission gear trains through engaging with each other. When down-shifting among the transmission gear trains, an engine speed Ne is set higher by a predetermined value &agr; than an input shaft rotational speed Nm. Thereby, the drag torque of the wet clutch works in such a manner that the input shaft rotational speed is increased, so that the difference of rotational speed between the input shaft and the output shaft becomes small. Accordingly, a transmission characteristic of the vehicular automated manual transmission with wet multi-disc type clutch can be improved.

Abstract: A control apparatus of an automated manual transmission has an input shaft provided with a plurality of drive gears, an output shaft provided with a plurality of driven gears engaged with the drive gears, and actuators for switching a transmission gear train to transmit a power from the input shaft to the output shaft. A hydraulic pressure system is provided with a control valve for regulating hydraulic pressure supplied to actuators, and an accumulator for saving working fluid and storing pressure energy. An electronic control unit determines that there occurs a trouble in the hydraulic pressure system when a rising rate of hydraulic pressure is lower than a predetermined value (S2, S3). Then, the electronic control unit switches a transmission gear train to the lowest speed gear range within a scope of no over-revolution of an engine through using pressure energy stored in the accumulator (S7, S8).

Abstract: An automatic transmission system has a switching mechanism for switching a plurality of shift gears and a sub-clutch by which transfer torque is controlled while being transferred from an input shaft to an output shaft. An actual deceleration speed is calculated based on an engine speed. Calculated next, based on an engine torque, is a target deceleration speed at which an output torque generated during upshifting is almost equal to an output torque generated after the upshifting. The transfer torque is controlled by feedback control so that the actual deceleration speed reaches the target deceleration speed.

Abstract: A control apparatus of an automated manual transmission has an input shaft provided with a plurality of drive gears, an output shaft provided with a plurality of driven gears engaged with the drive gears, and actuators for switching a transmission gear train to transmit a power from the input shaft to the output shaft. A hydraulic pressure system is provided with a control valve for regulating hydraulic pressure supplied to actuators, and an accumulator for saving working fluid and storing pressure energy. An electronic control unit determines that there occurs a trouble in the hydraulic pressure system when a rising rate of hydraulic pressure is lower than a predetermined value (S2, S3). Then, the electronic control unit switches a transmission gear train to the lowest speed gear range within a scope of no over-revolution of an engine through using pressure energy stored in the accumulator (S7, S8).

Abstract: A torque converter of a power transmitting apparatus includes a pump impeller connected to a crank shaft of an engine via a front cover, a turbine runner opposing thereto and an input clutch switching a relationship between the turbine runner and an input shaft to an engaged or disengaged state of an automatic transmission. A lockup clutch switched to an engaged or disengaged state with respect to the front cover includes a torsion damper provided between an upstream side plate fixed to the lockup clutch and a downstream side plate, in which a clutch drum is provided with an inertial mass at a downstream side of the torsion damper. Thereby, low-frequency sounds or vibrations in the power transmitting apparatus can be reduced.

Abstract: A control apparatus of a vehicular automated manual transmission includes an input shaft provided with a plurality of drive gears, and an output shaft provided with a plurality of driven gears engaging with the drive gears, in which the drive gears and the driven gears form a plurality of transmission gear trains through engaging with each other. When down-shifting among the transmission gear trains, an engine speed Ne is set higher by a predetermined value &agr; than an input shaft rotational speed Nm. Thereby, the drag torque of the wet clutch works in such a manner that the input shaft rotational speed is increased, so that the difference of rotational speed between the input shaft and the output shaft becomes small. Accordingly, a transmission characteristic of the vehicular automated manual transmission with wet multi-disc type clutch can be improved.

Abstract: An automatic transmission system has a switching mechanism for switching a plurality of shift gears and a sub-clutch by which transfer torque is controlled while being transferred from an input shaft to an output shaft. An actual deceleration speed is calculated based on an engine speed. Calculated next, based on an engine torque, is a target deceleration speed at which an output torque generated during upshifting is almost equal to an output torque generated after the upshifting. The transfer torque is controlled by feedback control so that the actual deceleration speed reaches the target deceleration speed.

Abstract: Hydraulic pressure regulated by a first pressure control valve is supplied to an electromagnetic changeover valve. The electromagnetic changeover valve changes over the hydraulic pressure between a low & reverse passage communicating with a low & reverse brake and a high clutch passage communicating with a high clutch, thereby a simultaneous engagement of the low & reverse brake and the high clutch can be avoided and further the simplification of the hydraulic control apparatus of an automatic transmission can be realized.

Abstract: Hydraulic pressure regulated by a first pressure control valve is supplied to an electromagnetic changeover valve. The electromagnetic changeover valve changes over the hydraulic pressure between a low & reverse passage communicating with a low & reverse brake and a high clutch passage communicating with a high clutch, thereby a simultaneous engagement of the low & reverse brake and the high clutch can be avoided and further the simplification of the hydraulic control apparatus of an automatic transmission can be realized.

Abstract: A lockup control apparatus and method of an automatic transmission engages a lockup clutch smoothly by gradually varying an electrical signal and holds a lockup pressure at a level corresponding to the engine load when the lockup clutch is engaged. The engagement of the lockup clutch is detected by comparing an engine rotational speed with a turbine rotational speed. The lockup pressure is determined at a minimal value enabling the lockup clutch to be engaged with a sufficient margin. Advantages of the lockup control apparatus are that shocks occured when the lockup clutch is engaged or disengaged can be attenuated and the life of the lockup clutch is substantially prolonged.

Abstract: An automatic transmission has a lockup clutch having a release side chamber and an apply side chamber. A lockup control valve having a spool is provided for controlling oil supplied to the release side chamber and apply side chamber. A solenoid operated valve is provided for controlling position of the spool of the lockup control valve to control pressure of oil supplied to the release side and apply side of chamber. A sensor is provided for sensing rotational speed of an output shaft of the automatic transmission. The solenoid operated valve is operated by a signal representing amplitude of variation of the output of the sensor, thereby controlling the pressure of the oil to increase of slipping the lockup clutch with increase of the amplitude.

Abstract: A system for controlling line pressure has a line pressure calculator for producing a line pressure signal in response to load on an engine and vehicle speed, a control signal generator responsive to the line pressure signal for producing a control signal, and an electromagnetic valve operated by the control signal, for controlling pressure of control oil in a hydraulic circuit of an automatic transmission. A pressure regulator valve provided in the hydraulic circuit is operated by the control oil to control line pressure.