摘要:
An improved lockup control system for a lockup-type torque converter for automotive vehicle performs a coasting lockup control of a lockup clutch with minimized response delay of lockup releasing control and suppressed lockup releasing shock upon acceleration of the vehicle. The control system includes a controller that is operative when the driving condition of a vehicle as represented by the throttle valve opening and the vehicle speed is judged to belong to a lockup region. The controller reduces the differential pressure across the lockup clutch to a lower limit value within a range in which the clutch can be prevented from slips. Thus, when the vehicle is reaccelerated and the driving condition shifts out of the lockup region, the reduction amount of the differential pressure is minimized to mitigate the response delay in the lockup releasing control. The differential pressure is reduced gradually in the case of rapid acceleration to avoid occurrence of a lockup releasing shock, and instantaneously to a maximum value in the case of gradual acceleration when the lockup releasing shock is not a problem.
摘要:
In general, an oil pump driving control device for a hybrid vehicle is described. A hybrid vehicle includes a drive-train configured and arranged to transmit power in the order of an engine, a first clutch, a motor generator, a second clutch and a drive wheel, and an oil pump operably configured and arranged at a location between the first clutch and the second clutch such that the oil pump is mechanically driven by at least one of the engine and the motor generator. The invention provides an oil pump driving control device that supplies the necessary oil pressure for an automatic transmission with only a single mechanical oil pump. For example, even when it is not possible to maintain tightening of the second clutch, oil pressure may be supplied by rotating the oil pump using the motor generator. In this way, the oil pressure may be supplied with a single oil pump.
摘要:
In general, an oil pump driving control device for a hybrid vehicle is described. A hybrid vehicle includes a drive-train configured and arranged to transmit power in the order of an engine, a first clutch, a motor generator, a second clutch and a drive wheel, and an oil pump operably configured and arranged at a location between the first clutch and the second clutch such that the oil pump is mechanically driven by at least one of the engine and the motor generator. The invention provides an oil pump driving control device that supplies the necessary oil pressure for an automatic transmission with only a single mechanical oil pump. For example, even when it is not possible to maintain tightening of the second clutch, oil pressure may be supplied by rotating the oil pump using the motor generator. In this way, the oil pressure may be supplied with a single oil pump.
摘要:
A shift control system for an automatic transmission comprises a plurality of timing valves which are directly under the control of a single solenoid.
摘要:
Herein disclosed is a wire harness arrangement of an automatic transmission control valve unit. Covered wires extend from a front surface of a body of the control valve unit to a rear surface of the same through a side surface of the same. A plurality of brackets are arranged on the front surface in a manner to define therebetween at least one guide channel in and along which the wires extend. Closure arms are bolted to one of the brackets to partially cover the guide channel thereby to prevent the wires from being disengaged from the guide channel. A cover member is bolted to the side surface of the control valve unit in a manner to retain the wires at the side surface.
摘要:
A control for an automatic transmission with a lock-up type torque converter, comprises a lock-up control valve, a forward clutch control valve, an electromagnetic valve, and a shuttle valve. The shuttle valve normally assumes a first position where a control signal regulated by the electromagnetic valve is supplied to the forward clutch control valve to render same to regulate forward pressure for activating a forward clutch. The shuttle valve shifts to a second position thereof when the transmission establishes forward speed ratios except the first speed ratio. In the second position of the shuttle valve, the control pressure regulated by the electromagnetic valve is supplied to the lock-up control valve to render same to effect slip control and lock-up control of the torque converter.
摘要:
A control system for an automatic transmission comprises an engine brake control valve, a downshift timing valve, an electro-hydraulic transducer operable in an engine brake control first mode or a downshift timing control second mode, a shuttle valve fluidly disposed between the electro-hydraulic transducer and the engine brake control valve and the downshift timing valve, and a controller for the electro-hydraulic transducer. The electro-hydraulic transducer is controlled to be maintained in ON state thereof during engine load range where the shuttle valve is designed to shift from one to the other position, thereby to render the engine brake inoperable even though the timing control may be carried out if the shuttle valve assumes the appropriate position.
摘要:
An electro-hydraulic control for an automatic transmission for an automotive vehicle, comprises a 3-2 timing valve, an overrun clutch control valve, an electromagnetic valve under the control of a computer, and a shuttle valve. The shuttle valve has a spool movable responsive to a line pressure variable with the engine throttle opening degree. The spool is movable between a first position where the overrun clutch control valve is under the control of the electromagnetic valve and a second position where the 3-2 timing valve is under the control of the electromagnetic valve.
摘要:
There is disclosed a motor vehicle having a set of front wheels, a set of rear wheels, an engine, and a transmission driven by the engine and having a transmission output shaft. The motor vehicle further has a transfer including a variable torque trasmitting (VTT) clutch for varying a distribution of torque between the set of front wheels and the set of rear wheels depending upon degree of engagement thereof. A clutch activating pressure is generated and transmitted to the VTT clutch under the control of a mode selector valve.
摘要:
A hydraulic pressure supply system for a variable torque transfer of a four-wheel drive vehicle in which a driving-torque distribution ratio between front and rear road wheels is varied by adjusting a clutch pressure applied to a variable torque clutch assembled in said transfer, comprises an oil pressure source supplying a pressurized working fluid into a hydraulic line, at least one pressure regulating valve fluidly connected to the line for decreasingly regulating the pressurized working fluid at a predetermined clutch pressure, and a directional control valve fluidly connected to the pressure regulating valve for directing the clutch pressure to a transfer clutch. An electromagnetic solenoid valve is provided for controlling the pressure regulating valve and the directional control valve for selectively supplying one of a stand-by pressure and a clutch engaging pressure to the transfer clutch. The stand-by pressure is set to be slightly less than a predetermined pressure level at which the transfer clutch starts to engage.