Abstract: A method for retarding a work machine having a fluid-cooled brake system includes the step of advancing said work machine at a first ground speed during a first period of time. The method also includes the step of sensing a fluid temperature of brake coolant circulating through said brake system during the first period of time. The method further includes the step of advancing said work machine at a second ground speed during a second period of time based on said fluid temperature. During retarding of the work machine, the radiator fan is operated at a predetermined, maximum fan speed irrespective of engine speed of the work machine's engine. Moreover, during retarding of the work machine according to the method of the present invention, the circulation pumps of the work machine's brake cooling system are operated at a predetermined, maximum pump speed irrespective of engine speed of the work machine's engine. An apparatus for retarding a work machine is also disclosed.

Abstract: In an automobile having a pair of front wheels, a pair of rear wheels, a brake system for selectively braking each of the pairs of front and rear wheels, an engine, a transmission system including a speed change gear device for selectively providing a plurality of transmission gear ratios, a center differential device, a front differential device, and a rear differential device, the traction control device detects slipping conditions of each of the pairs of front and rear wheels, and controls the brake system so as to brake at least one of the pairs of front and rear wheels for execution of traction controls according to one of at least two separate traction control programs which are automatically changed over for execution according to selections of the transmission gear ratios of the speed change gear device for a relatively high speed driving or a relatively low speed driving.

Abstract: For an automatic gearbox (2) a safety system is proposed in which erroneous releasing of the clutch or brake during cross-over is detected by the fact that the time variations of the transmission input speed and of the product of the transmission output speed multiplied by the first reduction ratio do not increase.

Abstract: A control system for a vehicular automatic transmission includes a speed change mechanism including an output element that is connected to the drive shaft of a vehicle to transmit power, and a rotary element connected to the output element. A control system for the speed change mechanism is also provided. The control system includes a hydraulic servo actuated brake for retaining the rotary element to check the rotation of the output element in a vehicle roll back direction. The brake includes a band brake that establishes different application forces depending on whether the brake operates by a self-energizing action or a de-energizing action according to the rotational direction of the rotary element.

Abstract: A method and a system are disclosed for selecting the final drive gear ratio in a harvester. The method comprises the steps of selecting the desired ratio by manually depressing a button on a control panel, automatically activating a brake to bring the harvester to a standstill in response to the depression of the button on the control panel, and activating a gear selection mechanism to select the desired gear ratio only after the harvester has come to a complete stop.

Abstract: A vehicle powershuttle system comprising a conventional forward/reverse gearset with a synchromesh and an electronic control system arranged to automatically control the vehicle main clutch, main brake and forward/reverse synchromesh to effect a substantially smooth engagement of forward or reverse drive to the vehicle driving wheels on manual selection of forward or reverse gear.

Abstract: A system and method for decreasing the time required to complete a ratio change in an electronically enhanced powertrain system is provided. The powertrain system includes a number of devices for providing a retarding torque to engine rotation to increase the decay rate of the engine speed during an upshift. These devices include an engine brake and an input shaft brake. A retarding torque is also provided by increasing engine accessory load by controlling various engine accessories such as a cooling fan, an air compressor, a hydraulic pump, an air conditioning compressor, and an alternator.

Abstract: An auxiliary brake apparatus is provided that includes an exhaust brake system for restricting a channel area of an exhaust passage so as to increase a resistance to rotary motion of an engine, and a retarder disposed between an automatic transmission and vehicle wheels, for generating a braking force that resists an engine brake torque transmitted to the automatic transmission.

Abstract: An electrically powered park lock actuator for use with an automotive vehicle transmission. The actuator is mechanically independent from a shift actuator which shifts the transmission between gear ranges, and comprises two high-speed, reversible DC electric motor acting via a speed reduction gear train to move a locking pawl into and out of engagement with a gear on the transmission output shaft. The shafts of the two motors are connected to a common worm which forms the fist stage of the gear train, and either one of the motors is individually capable of actuating the locking pawl. In the preferred embodiment, the park lock actuator is controlled by an electronic transmission control system so that the lock actuator may be controlled in coordination with a power-operated transmission gear shift actuator for integrated operation of the transmission. A back-up battery is supplied to provide sufficient power to unlock the transmission in the event of a failure of the vehicle main electrical power system.

Abstract: A control system for an automatic transmission having a hydraulic power transmission for transmitting the rotation of an engine to a gear shifter; a clutch to be applied, when a forward drive range is selected, for connecting the hydraulic power transmission and the gear shifter to one another; a one-way clutch to be locked, when the clutch is applied, for establishing a first forward speed of the gear shifter; a brake for locking the one-way clutch, when applied, to block the backward rotation of the output shaft of the gear shifter; a first hydraulic servo for applying the clutch when fed with an oil pressure; a second hydraulic servo for applying the brake when fed with an oil pressure; a stopping state detector that detects the stopping state of a vehicle by determining the vehicle speed is substantially 0, the accelerator pedal is in a released state and the foot brake pedal is depressed; a gradient detector that detects the gradient load of an uphill, as applied to the vehicle; and a controller that con

Abstract: A motor vehicle having an internal combustion engine and multi-ratio transmission is launched from a neutral idle rest condition. At neutral idle, the transmission is controlled such that the input and output members are decoupled. During vehicle launch, engine output is limit controlled to achieve desired shift quality as the transmission progressively couples the input and output members to transfer torque to the vehicle drive wheels.

Abstract: A control system for an automatic transmission includes a clutch adapted to be applied when a forward running range is selected, for transmitting the rotation of an engine to a speed change unit. A hydraulic servo applies the clutch responsive to feed of an oil pressure and a control unit controls the oil pressure fed to the hydraulic servo. The control unit brings the clutch into a substantially released state by lowering the oil pressure of the hydraulic servo if the stop state of a vehicle is detected by a stop state detector and applies the clutch if the stop state of the vehicle is not detected with the clutch released. The oil pressure fed to the hydraulic servo is raised according to a second mode when the accelerator pedal is depressed, in preference to a first mode in which a brake pedal is released, if the accelerator pedal is depressed when the stop state of the vehicle is not detected because the accelerator pedal is released so that the engagement of the clutch has not started.

Abstract: A driving power control apparatus for a motor vehicle. For meeting acceleration performance demanded by a driver of the motor vehicle, engine torque produced by an internal combustion engine and driving torque of the motor vehicle determined by the engine torque and a speed change ratio of a transmission are controlled coordinately for thereby allowing acceleration satisfying exactly the driver's demand.

Abstract: An electronically actuated park control system for an automatic transmission for a wheeled vehicle including a transmission range selection control assembly that sends to a powertrain control module a park signal, the module being adapted to deliver an output signal to a park controller circuit for actuating electric actuator motors which activate a mechanical transmission park mechanism, the motors having position feedback monitoring features as the transmission park mechanism is engaged or disengaged, the controller and the park controller circuit having inherent design redundancies as well as independent watchdog circuitry that ensure that transmission park release or park application responds precisely to transmission range selector requests by the driver.

Abstract: A system and method for decreasing the time required to complete a ratio change in an electronically enhanced powertrain system is provided. The powertrain system includes a number of devices for providing a retarding torque to engine rotation to increase the decay rate of the engine speed during an upshift. These devices include an engine brake and an input shaft brake. A retarding torque is also provided by increasing engine accessory load by controlling various engine accessories such as a cooling fan, an air compressor, a hydraulic pump, an air conditioning compressor, and an alternator.

Abstract: An automatic transmission system includes a drive device, electronic control and a valve control. An accelerator pedal, a brake pedal, speedometer and a gear will send signals to the electronic control. Based on these signals, the electronic control will control the valve control. Hydraulic fluid is provided to the drive device based upon operation of the valves in the valve control. The drive device contains a plurality of clutches for each of the valves of the valve control. These clutches are sequentially engaged by sequential operation of the valves in order to connect the engine shaft with an axle of the vehicle to thereby drive the vehicle.

Abstract: A driving power control apparatus for a motor vehicle. For meeting acceleration performance demanded by a driver of the motor vehicle, engine torque produced by an internal combustion engine and driving torque of the motor vehicle determined by the engine torque and a speed change ratio of a transmission are controlled coordinately for thereby allowing acceleration satisfying exactly the driver's demand.

Abstract: The invention relates to a safety system for a motor vehicle equipped with at least one braking system corresponding to a wheel unit. Furthermore, an automatic transmission system is provided which changes its ratio automatically based on specific shift criteria. A safety-relevant signal is generated in dependence upon a detection unit which detects states critical to safety of the brake system of the motor vehicle. According to the invention, the temperature of at least one brake system is applied for generating the signal relevant to safety. The shift criteria for the automatic transmission are changed in dependence upon this safety-relevant signal.

Abstract: A robust engine fueling control is provided for assuring neutral attainment in a vehicular automated mechanical transmission system (10) having a manually controlled master clutch (16). Upon sensing a requirement for a shift into transmission neutral, the disengaging jaw clutch members (134A/142A) are constantly urged into a disengaged position, fuel is caused to decrease to idle (302), and then fuel is blipped by increasingly larger amounts (304, 306, 308) until neutral is sensed.

Abstract: A non-power downshift throttle recovery control method/system is provided for vehicular automated mechanical transmission systems of the type including a multiple-speed mechanical transmission (10) coupled to an electronically controlled engine (E) by a master clutch (C). The transmission is shifted without disengagement of the master clutch (C), and the engine is fueled according to at least a first control strategy wherein fueling tracks throttle (P) position or a second control strategy wherein engine fueling is modified to cause engine speed (ES) to equal a target engine speed (ES.sub.TARGET).

Abstract: A control system for a vehicular power plant including an automatic transmission and an exhaust brake. The exhaust brake includes a butterfly valve movably disposed in an exhaust pipe. The control system is comprised of a control unit which is supplied with a signal representative of an engine brake condition and is adapted to generate a signal commanding an automatic downshift of the automatic transmission. Under the operation of the control unit, the exhaust brake is temporarily put into an inoperative condition in response to both the detected engine brake condition and the downshift command.

Abstract: A retarding control apparatus for controlling operation of a retarder, which is connected to an automatic transmission, by operating a retarder actuating device by manipulation of a retarder changeover switch includes control unit, to which are inputted a shift position signal, a throttle opening signal and a changeover signal from the retarder changeover switch, for outputtig an operating signal to the retarder actuating device. When the control unit receives the changeover signal from the retarder changeover switch for actuating the retarder and decides that a manual downshift has taken place based upon the shift position signal and throttle opening signal, the control unit diminishes the operating signal to the retarder actuating device in such a manner that braking force produced by the retarder is reduced by a prescribed value.