Abstract: An integrated system for automatically controlling the operation of both an automated manual transmission and a multiple speed axle assembly in a vehicle drive train assembly includes a transmission actuator for operating the transmission in any one of a plurality of transmission gear ratios. The system further includes an axle actuator for operating the axle assembly in any one of a plurality of axle gear ratios. An electronic controller is provided for operating the transmission in a desired one of the plurality of transmission gear ratios and for operating the axle assembly in a desired one of the plurality of axle gear ratios to provide a desired overall gear ratio for the vehicle. To accomplish this, the electronic controller is responsive to one or more input signals that represent operating parameters of the vehicle.

Abstract: An adaptive control system and method for direct clutch engagement control for an automatic transmission including a micro-controller that receives and stores input data from driveline sensors and executes transmission clutch control logic. The micro-controller develops output signals in real time and transfers the signals to a driver circuit that controls solenoids that enable clutch engagement. The signals for establishing clutch pressure buildup are delivered to a driver circuit that produces hydraulic pressure at the clutch to achieve a smooth torque and speed transition for the torque input elements of the transmission. Adaptive pressure values are stored in a keep-alive memory. The pressure values are adjusted values based on the result of previous engagements. This compensates for driveline variables such as changes in coefficients of friction, spring loads, clutch wear, etc.

Abstract: An apparatus and method for controlling the engagement rate of a clutch in a partially or fully automated mechanical transmission in response to an indication provided by the driver, such as the depression of an accelerator pedal of the vehicle. The apparatus includes an electronic controller which initially sets a desired speed for the vehicle engine during the shifting process, determines a rate of engagement movement of a release bearing of the clutch, and actuates appropriate valves to initiate the gradual engagement of the clutch. The electronic controller is responsive to the position of the accelerator pedal of the vehicle for adjusting the rate of engagement of the release bearing of the clutch. In a first embodiment, the electronic controller is responsive to movement of the accelerator pedal in a first direction (depressed for further acceleration) for incrementing the rate of engagement of the release bearing.

Abstract: A controller of an automatic transmission having a lockup clutch and a control method of the automatic transmission, in which engine rotational speed is prevented from changing even though turbine rotational speed changes at gear shift and slip control can be carried out without making a driver feel uncomfortable are provided. When a speed change command is detected and it is determined that an inertia phase has not yet started, target engine rotational speed during a replenish period is calculated and the target engine rotational speed control is carried out to have the target engine rotational speed. When it is determined that the control is in the inertia phase, another target engine rotational speed during the inertia phase is calculated. Then, target engine rotational speed control in which the engine rotational speed at the start of the inertia phase is maintained as the target engine rotational speed is carried out.

Abstract: A motor vehicle wherein the clutch is automatically engaged to initiate a creeping movement of the vehicle when the engine is on, the transmission is in gear, the gas pedal is not depressed and the brake or brakes is or are not applied. This entails or takes place at least substantially simultaneously with an increase of the engine torque. If the creeping movement is interrupted, e.g., as a result of the application of a brake, the clutch is disengaged and the engine torque is reduced.

Abstract: A device for controlling an automatic transmission and an engine for vehicles expanding a range of direct drive to improve fuel efficiency and decreasing the shock due to the transmission of torque at the time of acceleration or deceleration.

Abstract: An output torque control system for an internal combustion engine for a vehicle is operable during an upshift of an automatic transmission of the engine to increase the output torque from the engine, based on a control amount for increasing the output torque, to reduce a shock generated by the upshift. During the upshift of the automatic transmission, a slip amount of one of a plurality of clutches of the automatic transmission which is selected for the upshift is compared with a predetermined value. A calculation is made of a value of the control amount assumed when the slip amount of the one clutch becomes equal to the predetermined value, as a result of the comparison. The control amount is limited to the calculated value when the slip amount exceeds the predetermined value, as a result of the comparison.

Abstract: An apparatus for controlling a releasing action of a lock-up clutch in a power transmitting system of a motor vehicle wherein the lock-up clutch is disposed between a pump impeller connected to an engine, and a turbine impeller operatively connected to a drive wheel of the motor vehicle, the lock-up clutch being engaged for direct connection of the pump impeller and the turbine impeller, the apparatus including a lock-up clutch switching device for effecting a releasing action of the lock-up clutch from a fully engaged state thereof to a fully released state thereof, and an engine output reducing device for temporarily reducing an output of the engine upon the releasing action of the lock-up clutch.

Abstract: An automatic transmission of an automotive vehicle is set into a neutral position in response to a command instructing gear shifting of the automatic transmission when release of an accelerator pedal of the vehicle is detected. The automatic transmission has a plurality of speed clutches. The opening of a throttle valve arranged in an intake passage of an internal combustion engine installed on the vehicle is controlled such that the rotational speed of an input side of one of the speed clutches to be selected for the gear shifting and the rotational speed of the one of the speed clutches becomes substantially equal to each other when the automatic transmission is held in the neutral position. The one of the speed clutches is engaged upon detection that the rotational speed of the input side thereof and the rotational speed of the output side thereof becomes substantially equal to each other.

Abstract: A device for the automatic control of a clutch, in particular of vehicles in which the degree of clutch engagement is determined by the position of an accelerator of the vehicle, such as an accelerator pedal or handle. The device includes an actuation member connected to the clutch and two movable elements whose positions are associated with the degree of clutch engagement of the vehicle and the position of the accelerator, respectively. The movable elements include a switch for making or breaking an electric contact in dependence on the positions of the elements relative to one another.

Abstract: The invention relates to a hydraulic changing device for a multi-ratio vehicle transmission, especially for a commercial vehicle such as a mobile excavator. The hydraulic changing device feeds gear actuator (3, 4) with pressure medium conveyed by a servopump (10). There is a control slide (26) which is acted upon by the effect of a control spring (33), on the one hand, and by a pressure in a low-pressure chamber (23), on the other. The low-pressure chamber (23) is coupled to a low-pressure pump (20) operating in dependence upon the engine speed. The arrangement is completed by a shuttle valve (6) and a leakage valve (5). The pressure prevailing in the low-pressure chamber (23) actuates the control slide (26), against the force of the control spring (23), in such a way that undesired changes from a higher to a lower gear are prevented. The hydraulic changing device, of the invention, is advantageously distinguished by its low structural and design expenditures.

Abstract: An operator input control system assists shifting between gears in a multi-speed transmission without clutching. A single switch allows an operator to provide an indication of the next gear that is to be selected, and further allows the operator the option of requesting torque elimination when moving the transmission to neutral. In one embodiment, the switch includes a rotatable switch body that is held in either an upshift or downshift intent position. The operator is able to move the switch a slight additional rotational amount beyond the intent position to request torque elimination. Once the operator releases the switch, it returns to the upshift or downshift indicated position. The inventive switch reduces the complexity of operator input in an overall system for assisting an operator in shifting transmission speeds without clutching.

Abstract: A clutch control system for the automatic control of a motor vehicle clutch (14) which connects an engine (10) with a gearbox (12) under the control of a driver-operated gear ratio selector member (24). The control system includes an electric control unit (36) which controls the level of clutch engagement in response to an engine speed error signal (E) derived from a comparison of current engine speed (Ve) and a reference speed signal (Vr) generated by the control unit. A sensing means (19a) is provided to detect a "foot-off" condition of an engine controlling accelerator pedal (19) and to provide and indication of the full range of movement of the accelerator pedal from the "foot-off" condition to the fully depressed position. The electronic control unit (36) responds to an accelerator pedal "foot-off" signal to ensure that the reference speed signal is above the engine idle signal by a predetermined amount to prevent creeping of the associated vehicle due to partial clutch engagement at engine idle.

Abstract: A shift control system for shifting an automatic transmission from a predetermined gear stage to another by draining an oil pressure from predetermined frictional engagement element to release the same frictional engagement element and by feeding the oil pressure to another frictional engagement element to engage the same frictional engagement element while controlling the drain oil pressure of the frictional engagement element to be released and the engaging oil pressure to the frictional engagement element to be engaged. The shift control system includes an engine racing detector for detecting the racing of the engine while the transmission is being shifted in a clutch-to-clutch manner, and a hydraulic control circuit for controlling at least one of the drain oil pressure and the engaging oil pressure, on the basis of the degree of racing of the engine, as detected by the engine racing detector, such that the amount of racing of the engine falls within a predetermined range.

Abstract: A clutch control system for a motor vehicle having an engine (10), a gearbox (12) having a plurality of gear ratios, and a clutch (14) providing a drive connection between the engine and the gearbox. The control system includes a clutch actuation means (22) for controlling the state of engagement of the clutch and a control unit (36) which receives signals from a plurality of vehicle operating parameter sensors including a gear sensor (32) which indicates that a gear ratio is engaged in the gearbox. The control unit (36) processes these signals to produce a command signal for operation of the clutch actuating means. The control unit (36) ensures that if on powering-up of the control unit (36) the control unit receives a signal from the gear sensor (32) indicating that a gear ratio is engaged in the gearbox (12), the control unit inhibits disengagement of the clutch (14) by the clutch actuation means (22).

Abstract: A control system/method for controlling the engagement and disengagement of a friction master clutch (16) in an automated mechanical transmission system (10) is provided. The control system/method is effective to minimize shift transient times and to minimize or eliminate the occurrence of cab lurch events.

Abstract: A control device for an internal combustion engine comprises a shift lever position detector for detecting a shift lever position of an engine for an outboard motor; and an ignition timing controller for retarding an ignition timing of the engine for the outboard motor based on the shift lever position when a clutch is disengaged.