Abstract: The present invention provides a running control device for an industrial vehicle that has superior driving operability and that allows easy starting and stopping on road surfaces that have sloped or stepped surface. The running control device for an industrial vehicle includes an engine, a sensor that detects an operation amount of an accelerator member, a transmission that has a forward clutch and reverse clutch, a brake that applies braking to the vehicle, and a controller. The controller simultaneously controls the engine revolutions, the engaging force of the forward clutch and reverse clutch and the braking force of the brake in accordance with the operation amount.

Abstract: A method for launching an automatic vehicle transmission utilizing dual clutches in place of a torque converter avoids clutch overheating, sudden launch or roll-back by placing a clutch in a slip mode only after the vehicle's brakes have been actuated and fully disengaging the clutch upon over-heating detection. When launch is initiated, a first gear engaged and the brakes are released, the associated clutch is fully engaged to avoid overheating.

Abstract: In a drive train for a working machine, in particular, a wheel loader, the driving speed is preselected via a driving pedal (11) and the working hydraulic system is actuated via a selector lever (8), whose signals are fed to an electronic control unit (10) which regulates a drive engine (1) and a clutch (2) arranged between the drive engine (1) and a pump impeller (3) of a hydrodynamic torque converter in such a manner that an auxiliary drive (6) for a pump (7) of the working hydraulic system is operated at a sufficient speed, while the preselected driving speed is not exceeded.

Abstract: A hydraulic control apparatus for a hybrid vehicle, which enables a smooth torque transmission when an engine of the vehicle is started from an idling stop state. The hydraulic control apparatus includes an engine and a motor as power sources, a transmission having a torque converter, a clutch for a starting gear, an engine automatic stop and start device which is associated with the engine, a motor-driven oil pump for supplying oil pressure to the transmission, a brake pedal sensor, an accelerator pedal sensor, an engine revolution rate sensor. The oil pressure applied to the clutch is controlled to a level corresponding to a creeping torque when the engine is automatically stopped. When the brake pedal is released, the engine is automatically started, the accelerator pedal is not depressed, and the engine revolution rate is less than an idling revolution rate, the oil pressure applied to the clutch is maintained to the level corresponding to the creeping torque.

Abstract: A method for altering the coupling torque of a coupling in the drive train of a vehicle with an automatic gearbox and/or automatic coupling in a creep drive mode of a vehicle. According to the invention, the coupling torque is altered according to at least one variable, the parameter of the vehicle describing the creep drive mode thereof.

Abstract: The invention relates to a process for carrying out an automated clutch actuation of a motor vehicle with a drive engine and a transmission, connected to said drive engine by way of a clutch, in which process the clutch exhibits both an opened and a closed operating position, whereby to introduce unpowered operating phases the clutch is transferred by means of automation into the opened operating position and to introduce powered operating phases it is transferred by means of automation into the closed operating position. To design such a process more reliably and comfortably, the variables, from which a dangerous situation in time or its termination can be concluded with a certain probability, are measured, according to the invention, so that the clutch can be moved into an operating position (opened or closed), which makes it possible to carry out faster the subsequent request of the driver—such as an acceleration request or a braking request.

Abstract: A vehicle driving force control apparatus is provided for a vehicle to prevent a shock from being generated when a clutch disposed between a subordinate drive source and subordinate drive wheels is transferred to a disengaged state during vehicle travel. When a transition is made from a four-wheel drive state to a two-wheel drive state, and a clutch is released during vehicle travel, the motor torque is maintained constant at a level of a clutch-release torque required by the electric motor as the output for bringing the torque on the clutch substantially to zero.

Abstract: The invention relates to a control system, method for control, and control software for a startup shift element of an automated motor vehicle transmission or automatic transmission capable of electro-hydraulic or electro-pneumatic actuation with an electronic transmission control device, whereby the startup shift element may be shifted hydraulically or pneumatically in emergency mode even if the electronic control device fails. The control system includes a transmission-independent control module, and a emergency-operation mode shift valve capable of electrical triggering that controls the hydraulic or pneumatic actuation device of the startup shift element. If the transmission-independent control module fails during transmission emergency-mode operation, the startup shift element is capable of actuation by means of the electrical triggering of the emergency-operation mode shift valve via the transmission-independent control module. This may particularly control a motor-vehicle startup procedure.

Abstract: A method for controlling a vehicle having a first clutch mounted between an engine and a gear drive transmission, and dog clutch type torque transmission means disposed between an input shaft and an output shaft of the gear drive transmission, and wherein the first clutch is controlled at starting the vehicle or at gear shifting, comprising the steps of controlling a transmission torque of the first clutch based on a difference between the engine speed/revolution speed of the input shaft at starting the vehicle so as to control a quantity of increase in a transmission torque of the first clutch in accordance with the value of the difference; and controlling the engine torque based on the transmission torque of the first clutch so as to increase the engine torque according to an increase in the transmission torque of the first clutch.

Abstract: A hill hold control apparatus of an automatic transmission having a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with the respective drive gears and mounted on an output shaft and a bypass clutch for engaging the input shaft with the output shaft, includes a grade judging means for judging that the vehicle travels on a grade, a shift gear train detecting means for detecting a shift gear train of the automatic transmission, a foot brake operation detecting means for detecting an operation of a foot brake and a control means for engaging the bypass clutch when it is judged that the vehicle is in standstill and the shift gear train is a start gear train and the foot brake is inoperative based on respective signals of the grade, the shift gear train and the operation of the foot brake.

Abstract: A motor vehicle (2) has a transmission (6) with an automated clutch (8) with a control device (20), a gas pedal, a brake pedal and an actuating element (28, 30, 32) which is released for activating an inching procedure. In the method for determining a defined inching procedure, time is measured by the actuating element (28, 30, 32) after the inching procedure has been activated and, after a reference value has been exceeded, the inching procedure starts at a predeterminable speed as long as neither the brake pedal nor the gas pedal has been activated.

Abstract: A hill hold control apparatus of an automatic transmission having a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with the respective drive gears and mounted on an output shaft and a bypass clutch for engaging the input shaft with the output shaft, includes a grade judging means for judging that the vehicle travels on a grade, a shift gear train detecting means for detecting a shift gear train of the automatic transmission, a foot brake operation detecting means for detecting an operation of a foot brake and a control means for engaging the bypass clutch when it is judged that the vehicle is in standstill and the shift gear train is a start gear train and the foot brake is inoperative based on respective signals of the grade, the shift gear train and the operation of the foot brake.

Abstract: A driving force control unit for a vehicle, which allows transmission of driving force from a driving motor to driving wheels irrespective of releasing an accelerator pedal at a certain or lower vehicle speed when a transmission is selected to a running range, and which switches the magnitude of the driving force while the accelerator pedal is released at a vehicle speed no more than the certain vehicle speed between a greater condition and a smaller condition in accordance with depression of a brake pedal so that the driving force is made lower at a depression of the brake pedal than at a release of the brake pedal, wherein the driving force value in the greater condition at a certain or lower vehicle speed is changed according to the vehicle speed, and the change of the driving force value is characterized in that the driving force value becomes smaller as reaching from the vehicle speed at the maximum driving force value to the certain vehicle speed, and further switching the driving force, before stopping

Abstract: A driving force control unit for a vehicle, which allows transmission of driving force from a driving motor to driving wheels irrespective of releasing an accelerator pedal at a certain or lower vehicle speed when a transmission is set in a driving range, and which switches the magnitude of the driving force while the accelerator pedal is released at vehicle speed no more than the certain vehicle speed between a greater condition and a smaller condition in accordance with depression of the brake pedal so that the driving force is made lower at a depression of the brake pedal than at a release of the brake pedal. In the driving force control unit, the driving force value in said greater condition upon switching from said smaller condition to said greater condition, at a release of the brake pedal during the time the vehicle stops, is increased or decreased according to an inclination angle of the vehicle at the time of stopping.

Abstract: A method for controlling a vehicle having a first clutch mounted between an engine and a gear drive transmission, and dog clutch type torque transmission means disposed between an input shaft and an output shaft of the gear drive transmission, and wherein the first clutch is controlled at starting the vehicle or at gear shifting, comprising the steps of controlling a transmission torque of the first clutch based on a difference between the engine speed/revolution speed of the input shaft at starting the vehicle so as to control a quantity of increase in a transmission torque of the first clutch in accordance with the value of the difference; and controlling the engine torque based on the transmission torque of the first clutch so as to increase the engine torque according to an increase in the transmission torque of the first clutch.

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: A control apparatus for an automatic transmission of a vehicle having a forward friction element for engaging or disengaging a turbine shaft with the automatic transmission in a forward running direction and a lock-up clutch for directly transmitting a rotation of an engine to the turbine shaft, comprises an abrupt deceleration control means for disengaging the forward engagement element and the lock-up clutch when an abrupt deceleration of the vehicle is detected, and a restoring means for canceling the abrupt deceleration control means and for restoring the forward friction element to an engagement state when an accelerator pedal is depressed for acceleration.

Abstract: The present invention relates to an automatic clutch intended for an engine-transmission unit in a vehicle with random gear changing. The gearbox comes into action automatically as soon as it has recognized the driver's intentions. Furthermore, the gear lever shift, the speed and the engine torque of the vehicle as well as the brake system action are monitored. As soon as the gear lever has shifted and the speed or the torque has fallen sufficiently and/or the brake system is actuated, the clutch is released.

Abstract: A vehicle equipped with a system (30) for automatically disengaging and engaging a friction clutch (13) coupling between an engine (11) and a transmission (16). The vehicle is also equipped with an automatic brake system (34) for automatically applying and releasing a brake to and from wheels (43). The automatic clutch disengagement/engagement system (30) performs high speed clutch engagement at the time of restarting the vehicle. The automatic brake system (34) releases the brake upon completion of the quick clutch engagement. The quick clutch engagement occurs in a clutch play range. The amount of quick clutch engagement is determined by depression of an accelerator pedal (10). Since the accelerator depression varies from when the vehicle is started on a flat road to when on an inclination, an optimum brake releasing is effected regardless of the road inclination if the timing of brake release is determined in this manner.

Abstract: The invention concerns an automatic clutch in a motor vehicle drive train with a manually operated gearshift. If an accelerator pedal or the like used to control the engine and a vehicle service brake are not activated, the clutch is set at a creeping moment when a gear is engaged and the engine is running. When the service brake is actuated, this creeping moment is maintained for a predetermined time interval, decreased or suppressed in a time-delayed manner.

Abstract: In a vehicle with an automatically controlled clutch in which ON-OFF of the friction clutch is automatically controlled by a controller, clutch control during coasting (with the accelerator depression amount being 0%) is conducted according to a clutch ON-OFF map for coasting provided in the controller.Two different clutch ON-OFF maps for coasting are provided; one having a smaller hysteresis width, and the other having a larger hysteresis width. Clutch control during coasting is conducted by applying the map with a smaller hysteresis width when the brake pedal is stepped on or applying the map with a larger hysteresis width when the brake pedal is not stepped on. Thus, clutch ON-OFF hunting can be avoided, and smooth stopping can be conducted.

Abstract: An automated clutch between the engine and the variable-speed transmission in the power train of a motor vehicle is operated by a control unit which receives signals from several circuits and/or sensors via one or more conductors. The control unit shifts from a normal operating mode to an emergency mode when one or more sensors and/or circuits and/or conductors are defective. When in emergency mode, the control unit disengages the clutch when the driver starts the engine while the vehicle brake or the parking brake is applied. This ensures that the engine can drive the vehicle as soon as the transmission is shifted into a forward gear or into reverse gear and the application of the brake or brakes is terminated because the control unit is then again free to engage the clutch. Furthermore, such mode of operation enables the driver to shift the transmission into or from a selected gear in response to the application of a relatively small force to the gear shifting lever.

Abstract: In a control apparatus in which a weak creep control for lowering the engaging force of a clutch (5) is performed when a throttle opening (.theta.th) is fully closed, when a brake pedal (BP) is depressed, and when the period of a vehicle speed judging pulse (V pulse) has exceeded a predetermined value TM2s whereby the vehicle is discriminated to be in a stopped condition. Once the weak creep control has started, the weak creep control is stopped by the input of the first V pulse and is transferred to a strong creep control in which the clutch engaging force is increased.

Abstract: The method and apparatus for controlling a damper clutch in a torque converter of a vehicle includes a plurality of sensors which sense the operating conditions of the vehicle. Based on the sensed operating conditions of the vehicle, a control unit determines whether the vehicle is driving in an area congested with traffic, and prohibits operation of the damper clutch when it is determined that the vehicle is driving in an area congested with traffic.

Abstract: In a method of operating an automatic clutch arranged between an engine and a drive train of a vehicle during low speed operation of the vehicle which has a brake system, a clutch control unit and sensors supplying to the clutch control unit information concerning vehicle speed and actuation of the brake system, the clutch is controlled below a certain vehicle speed to transmit only a limited torque to the drive train and, upon actuation of the brake system, the clutch is controlled such that the torque transmitted to the drive train decreases with increasing effectiveness of the brake system.

Abstract: A control is provided for controlling reengagement of a master clutch (16) in a vehicular automated mechanical transmission system. A nominal reengagement rate (CLU.sub.-- RATE) is determined as a function of engine lag (K.sub.1), throttle position (THL), engine acceleration/deceleration (dES/dt) and/or input shaft acceleration/deceleration (dIS/dr). To provide smoother shifting during braking (BRK=1, THL=0) and/or coasting (THL<30%) downshifts, the clutch is reengaged at a rate slower than the nominal reengagement rate.

Abstract: An improved lockup control system for a lockup-type torque converter including a lockup clutch performs a lockup releasing control of the lockup clutch with a satisfactory response characteristic at any input torque of the torque converter without causing a lockup releasing shock. The control system includes a controller which 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 releasing region, to reduce the differential pressure across the lockup clutch for disengaging the lockup clutch and thereby releasing the lockup. On such occasion, in the first place, the differential pressure is set to an initial differential pressure immediately before the lockup clutch begins to slip, depending upon the input torque of the torque converter at the instant of the lockup releasing command.

Abstract: An apparatus is disclosed which prevents occurrence of an engine stalling in a power train of an automotive vehicle, including an engine and a lock-up type automatic transmission. The apparatus is operative during a braking operation of the vehicle and includes an engine controller to perform an idling speed control for the engine, and a transmission controller to perform a lock-up releasing control for releasing the torque converter from the lock-up mode. When the lock-up releasing control is being performed, the engine controller continuously performs the idling speed control and thereby prevents occurrence of engine stalling.

Abstract: A running control apparatus for an automobile prevents an abnormal running state by depressing a brake pedal even when a fault takes place in the component(s) of the control apparatus. When a detected brake pedal depression stroke exceeds a predetermined value, an electric power supply to a throttle actuator is interrupted to thereby allow a throttle valve to assume a fully closed position.

Abstract: A friction clutch coupling an engine and a gear transmission of a vehicle is controlled by a microprocessor based circuit using logic which defines operating modes according to engine and clutch conditions. During the time of clutch closure, when the vehicle is starting from rest in a startup or launch mode, the throttle or other engine control signal is restrained from quickly responding to the accelerator pedal. This avoids engine overspeeding which results from generating high torque before sufficient clutch capacity has been achieved. The control signal is developed as a function of the pedal position under control of throttle logic which, in turn, is dependent on clutch operating modes defined by the clutch logic.