Abstract: An idle speed compensation system for a vehicle includes an idle speed control system that varies airflow to an engine at idle and a transmission driven by the engine. A controller communicates with the idle speed control system, the engine, and the transmission. The controller generates an idle speed compensation signal based on a transmission load.

Abstract: A method and apparatus for controlling a motor vehicle drive train component. The motor vehicle includes an engine control device and a clutch control device. The method and apparatus control the clutch control device and the engine control device so that they do not simultaneously control or regulate the same operating parameter of the drive train.

Abstract: In a vehicle in which a moderate throttle opening degree control of maintaining a degree of throttle opening that is less than a degree of throttle opening that corresponds to an accelerator operation is performed for a predetermined period following a beginning of the accelerator operation, if it is determined that a clutch-to-clutch downshift judgment has been made, the reduction of the engaging pressure of a disengage-side friction engagement device is restrained until it is determined that the moderate throttle opening degree control has ended. Therefore, even if the turbine torque is returned to a normal value at the end of the moderate throttle opening degree control, insufficient engaging torque is avoided, and the takeover of engaging torque for the clutch-to-clutch downshift is smoothly performed while the turbine torque is stable. Hence, occurrence of a shock related to the end of the moderate throttle opening degree control is suitably prevented.

Abstract: Systems and methods for controlling shift and throttle of an electronically controlled power train are disclosed. The system includes a throttle or shift controller having an operating range. An hydraulic slave is in fluid communication with the controller such that a movement of the controller within its operating range causes a flow or displacement of fluid between the controller and the hydraulic slave. The hydraulic slave has a shaft that rotates in response to the fluid flow between the controller and the hydraulic slave. The shaft is adapted to be coupled to a position sensor such that rotation of the shaft causes the position sensor to produce electrical throttle control signals that represent the movement of the controller within its operating range. The electrical signals can be adapted to cause the power train to set an engine throttle and a transmission shift position according to a current position of the controller within its operating range.

Abstract: A method and a device for determining a variable describing the speed at least one driven wheel of a motor vehicle. In this context, variables describing the respective wheel speeds for the remaining driven wheels of the motor vehicle, and a variable describing the output rpm of a transmission of the motor vehicle are determined. To be able to make a reliable variable describing the speed magnitude of the wheel available to a traction control system or a vehicle-dynamics control system of a motor vehicle in spite of the failure of a speed sensor arranged at one of the wheels, the variable describing the speed for the at least one driven wheel is determined as a function of the variables describing the respective wheel speeds of the remaining driven wheels and as a function of the variable describing the transmission output rpm.

Abstract: A dual displacement engine is provided with first and second crankshaft portions which are fluidly coupled to one another, for example, by a torque converter in order to provide an engine that can be utilized with alternative configurations of engine cylinders. Specifically, a first crankshaft portion can be provided with, for example, four pistons as a primary crankshaft portion for driving the vehicle, while a second crankshaft portion can be selectively engaged via a fluid coupling to supplement the power provided by the primary crankshaft portion. Thus, the vehicle can be operated using the primary crankshaft portion for fuel efficient operation while the second crankshaft portion can be selectively engaged for meeting higher torque demand requirements as necessary.

Abstract: A method and apparatus for controlling an internal combustion engine. A target cylinder torque required of one of a plurality of cylinders is individually calculated in accordance with a target engine torque, and a timing for opening and closing each of a plurality of intake and exhaust valves in each of the plurality of cylinders is determined in accordance with the target cylinder torque. Thereby the torque of the internal combustion engine is individually controlled for each of the plurality of cylinders.

Abstract: In a vehicle with a gear-shift transmission of a kind that requires a torque-free state to shift gears, the riding comfort is improved by a method of shifting gears where a gear shift is preceded by the steps of: reducing the vehicle acceleration at a time t1 from an existing level (1) to a first acceleration level (3), maintaining the vehicle acceleration at the reduced level (3) for a predetermined time interval, and at the end point t3 of the predetermined time interval, reducing the acceleration further to a second acceleration level that is lower than the first level.

Abstract: A method and an arrangement for controlling the drive unit of a vehicle are suggested which prevent a lost motion and a dead path in the interpretation of the position of the accelerator pedal for forming a desired acceleration. An acceleration command is derived from a position of an operator-controlled element (1), especially of an accelerator pedal, and a desired value for an output quantity of the drive unit is formed in dependence upon the acceleration command. A minimum value and/or a maximum value for the acceleration of the vehicle is determined in dependence upon an instantaneous running resistance. The minimum value and/or the maximum value are assigned to respective boundaries of an adjustment range for the position of the operator-controlled element (1).

Abstract: A transmission state determination method of a power transmission device for an internal combustion engine driven vehicle including steps of: driving a generator by an internal combustion engine with a vehicle driven by the internal combustion engine stopped; performing an intake air amount gradually increasing process for gradually increasing the intake air amount of the internal combustion engine when the internal combustion engine is controlled so as to generate predetermined power from the generator; determining that the power transmission device for transmitting the output of the internal combustion engine to wheels of the vehicle is in a state of transmitting power when slight movement of a vehicle body is detected in the intake air amount gradually increasing process; and determining that the power transmission device is in a state of cutting power transmission when movement of the vehicle body is not detected in the intake air amount gradually increasing process.

Abstract: System and method for controlling idle speed for a vehicle including an internal combustion engine coupled to an automatic transmission which has a torque converter. The system includes a sensor operative to detect a parameter based on a torque converter speed ratio and generate a signal indicative of the parameter detected, and a controller programmed to determine basic idle speed, determine a target idle speed by correcting the basic idle speed based on the signal when the automatic transmission is in a drive range in engine idling condition. The method includes determining basic idle speed when the automatic transmission is in a drive range in engine idling condition, detecting a parameter based on a torque converter speed ratio, and determining a target idle speed by correcting the basic idle speed based on the parameter.

Abstract: An ignition timing control system and method, and an engine control unit for an internal combustion engine, which are capable of setting optimum timing for execution of retardation of ignition timing when a vehicle on which the engine is installed is accelerated, thereby effectively reducing longitudinal vibrations of the vehicle, and maintaining acceleration performance. An acceleration demand-detecting module detects a demand of acceleration of the engine. A rotational speed-detecting module detects a rotational speed of the engine. A rotational variation amount-calculating module calculates a variation amount of the rotational speed of the engine. A rotational variation amount differential value-calculating module calculates a differential value of the variation amount of the rotational speed of the engine. A retard amount-calculating module calculates a retard amount for retarding the ignition timing.

Abstract: A shift control apparatus of an automatic transmission of a motor vehicle to which torque is transmitted from an engine via a fluid coupling device is provided. In the automatic transmission including a plurality of hydraulically operated friction elements, a clutch-to-clutch downshift is carried out during coasting of the vehicle by releasing one of the friction elements and engaging another friction element. A controller of the shift control apparatus detects a difference between input and output rotation speeds of the fluid coupling device, and increases an engine speed by a controlled amount based on the difference between the input and output rotation speeds when the clutch-to-clutch downshift is carried out during coasting of the vehicle, so that the vehicle is brought into a minimal driving state in which the engine speed is slightly higher than the output rotation speed of the fluid coupling device.

Abstract: A system is described for minimizing engine torque disturbances that would otherwise cause degraded drive feel by a vehicle driver. The system utilizes multiple torque transmission paths of a transaxle unit mounted to the engine. The system manipulates the torque transmitted by adjusting the clutches of multiple torque transmission paths so that the torque disturbance in the engine results in relatively constant vehicle drive torque. In particular, during particulate filter regeneration, a potential torque increase is transmitted through multiple torque paths of the transmission to maintain output torque relatively constant.

Abstract: A process for regulating stopping of an engine during a typical traffic idling event in order to reduce fuel consumption. There is an interactive process between the engine and the transmission involving shutting down the engine when the driver has braked to a stop and restarting upon release of brake pressure. The transmission input elements are clamped during the engine shut down to minimize transient torque disturbance and the vehicle is restarted when motion is detected. The process involves pressurizing of first gear friction elements during the stop period using an auxiliary pump so that the transmission will be ready to transmit torque on restart. Restart surge is avoided by transmitting a limited amount of torque in a controlled manner during a restart.

Abstract: A control apparatus of an automatic transmission capable of achieving a smooth change of output shaft torque to torque which can be generated by a friction clutch, thus enabling a smooth gear change even if the output shaft torque is high at the gear change. If the output shaft torque exceeds limit transmission output shaft torque obtained by multiplying a torque capacity of the friction clutch by a gear ratio provided for the friction clutch when a gear change command is issued in the automatic transmission, engine torque is controlled so as to make the output shaft torque decreased to the limit transmission output shaft torque, and then the engine torque control is switched when the output shaft torque decreased to the limit transmission output shaft torque to start the gear change operation.

Abstract: A gear shift device for a vehicle with a manually operated gearbox (30) and a gear shift device (10) for operating the gearbox. The gear shift device comprises a gear lever (15), a master cylinder (11) and a slave cylinder (12), which are connected to the gearbox (30). A hydraulic line (13) connects the cylinders (11, 12) with each other. The gear shift device also comprises a computer (40) which can receive information concerning an initiated gear shift operation, establish the value of a torque which is exerted on a drive shaft (21) between the vehicle's engine (20) and the gearbox (30), and control the engine's (20) power. In the hydraulic line (13) there is mounted a shut-off valve (42) and the computer (40) is arranged to transmit impulses for controlling the shut-off valve (42) based on the received information.

Abstract: An engine controller for a vehicle having an engine and an automatic transmission, the automatic transmission controlling the engine during a coast-down to a predetermined gear stage, the engine controller having an engine speed detection unit that detects the number of rotations of the engine output shaft an input shaft speed detection unit that detects the number of rotations of the input shaft a power-on detection unit for detecting a power-on state caused by a driver an engine output control unit that controls the output of the engine; and an engine control unit determines an engine speed and an input shaft speed and outputs a signal to the engine output control unit such that a predetermined relationship is maintained between the engine speed and the input shaft speed when the power-on state is detected in the coast-down state.

Abstract: Method for influencing the propulsive power of a motor vehicle driven by a drive motor. An intervention variable, influencing the torque of the drive motor, is ascertained as a function of the wheel behavior of at least one wheel of the motor vehicle, and/or as a function of the motion of the motor vehicle. The drive motor is acted upon with the intervention variable to limit the propulsive power of the motor vehicle. An easily manipulated, safe, and reliable capability for automatically detecting situations in which the driver desires a greater propulsive power and making a greater propulsive power available in those situations, a motor vehicle with a slip control system is created. Evaluating a pedal variable that describes the actuation of an accelerator pedal of the motor vehicle, or a limitation variable that describes the number of limitations of driver stipulations resulting from the ascertaining of the intervention variable within a definable time window.

Abstract: In a method for determining evaluation data for transmissions in vehicles, data is measured in the vehicle via sensors, the measured data is used to form intermediate data specific to the vehicle and then, from the measured data and the intermediate data, evaluation data is determined which is shown, stored or transmitted to a data collecting station.

Abstract: A method for protecting a variator in a continuously variable belt-type transmission of a motor vehicle, simultaneously with a calculation based on an engine signal containing the magnitude of the engine torque and subsequent conversion of a contact-pressure theoretical value, providing the added safety on the variator, that the contact pressure on the variator is measured by a pressure sensor and the maximum transmissible transmission input torque is calculated with reference to this value. The maximum transmissible transmission input torque is then compared with the engine torque to the transmission and in case the maximum transmissible transmission input torque is less than the engine torque, an engine interruption is effected.

Abstract: A system and method for the soft shift of a transmission connecting a power source to a well stimulation pump through a transmission. When it is desired to change gear ratios in the transmission, the transmission is caused to enter a torque converter mode from a lockup mode. The engine speed is adjusted according to a signal representative of the speed of the transmission output shaft. Once the gear ratio has been changed, the transmission is caused to enter a lockup mode from the torque converter mode.

Abstract: A shift control apparatus for an automatic transmission eliminates or reduces a sense of discomfort to the driver and other occupants during slip, while maintaining the necessary driving force. When slip is determined by detection of wheel speed, a slip signal is output. A controller which receives the slip signal outputs a maintaining signal for maintaining the gear stage which existed at the time the slip signal was received, until a predetermined period of time has passed. If the slip continues after the predetermined period of time, the controller outputs a shift signal to the automatic transmission to shift it to a predetermined gear stage, thus reducing driving force and preventing slip from continuing. If the slip stops within the predetermined period of time, the slip signal is canceled such that the current gear stage is maintained and no shift is executed.

Abstract: A decision is made as to whether a vehicle is traveling in an uphill traveling mode or in a downhill traveling mode with reference to an incremental running resistance &Dgr;R determined on the basis of a running resistance that will act on the vehicle while the vehicle is traveling in a flat road traveling mode. A desired traction Fd for a full-open throttle state in which a throttle valve is fully open is set if the vehicle is in the uphill traveling mode by using the incremental running resistance &Dgr;R, and a desired traction Fd for a full-closed throttle state in which the throttle valve is fully closed is set if the vehicle is in the downhill traveling mode by using the incremental running resistance &Dgr;R. The desired traction Fd and an achieved traction F(t) in the full-open throttle state at a present traveling speed V are compared if the vehicle is in the uphill traveling mode.

Abstract: A system is disclosed for implementing a technique for managing torque of a drivetrain. The drivetrain includes an air intake passage having a throttle valve, an internal combustion engine having an output shaft, a transmission having an output shaft, and a rotational propulsion member operatively coupled to the transmission by a propeller a drive axle. The system includes a throttle valve sensor, an engine speed sensor, a transmission speed sensor, a vehicle speed sensor, a transmission controller, and an engine controller. The throttle position sensor provides a throttle position signal that is indicative of a rotational position of the throttle valve. The engine speed sensor provides an engine speed signal that is indicative of a rotational speed of the engine output shaft. The transmission speed sensor provides a transmission speed signal that is indicative of a rotational speed of the transmission output shaft.

Abstract: An engine mounted to a vehicle includes at least one manipulation member used for control of output of the engine. An electronic control unit controls the manipulation member in accordance with the driving condition of the engine. When it is determined that there is an abnormality in the electronic control unit, the amount of air drawn into the engine is fixed to a predetermined value and the amount of manipulation of the manipulation member is restricted. When the rotational speed of the engine becomes higher than the predetermined speed, the electronic control unit determines that there is an abnormality relating to the manipulation of the manipulation member.

Abstract: A computer-implemented method for initiating forward motion in a vehicle equipped with a manual transmission. The method includes the steps of providing a sensor for determining clutch status; providing a sensor for determining when a transmission of a vehicle is in first gear; providing a throttle actuator calibrated to raise engine revolutions per minute from idle to a predetermined elevated level upon receipt of a throttle-up signal; and providing a control unit to receive inputs from the clutch and gear status sensors. The control unit is programmed to deliver the throttle-up signal to the throttle actuator when the sensor of clutch status indicates that a change in clutch status from engaged to non-engaged, and the gear sensor indicates that the vehicle is in first gear.

Abstract: A powertrain system (10) control for controlling engine (12) output torque as a function of engaged ratio of a transmission (14). Separate torque limits, A, B, C, D, respectively, are set for start ratios, intermediate ratios, direct ratio and overdrive ratios. The torque limits are set such that A<B<C>D and B<D.

Abstract: A two speed supercharger system (20) for an internal combustion engine. The supercharger system includes a supercharger pump (40) that is driven by the engine via a gear box (34). The gear box includes two planetary gear sets (54, 70) and a controllable clutch (66). A controller (35) selectively activates the clutch to control the transition between the two speeds to assure a smooth transition without sudden changes in torque output.

Abstract: A method of controlling an automatic transmission of a motor vehicle operating in a automatic speed control speed mode is provided. The first step in the method is measuring the torque output of the engine. A torque load acting on the transmission in a first gear is then determined. A maximum torque capable of being produced by the engine is then predicted. A torque output of the transmission in a second gear is then determined based upon the predicted maximum torque capable of being produced by the engine. A transmission shift from the first gear to the second gear is then allowed if the determined torque output of the transmission in the second gear is greater than the torque load of the transmission in a first gear.

Abstract: In order to reduce shift shock in shifting from a 2 driving range to a 3 driving range and improve the endurance of an automatic transmission, a 2-3 up-shifting shift control device of an automatic transmission of the present invention is provided, comprising a vehicle speed sensor, a shift lever position sensor, a throttle position sensor, a shift control unit, and a shift drive unit performing a predetermined 2-3 upshifting drive control operation by controlling hydraulic pressures in response to the sensors.

Abstract: In a working vehicle, an electronic control regulating valve 121 controls a connection force in clutch mechanisms 35 and 36 in a transmission 30, and a input side revolution signal of the transmission, an output side revolution signal, a speed stage position signal and a pedal angle signal of an inching pedal 114 are inputted to control a slip in the transmission 30. Further, a pedal angle signal of an accelerator pedal 107 is inputted to cope with a hyper-slow mode. Furthermore, in an engine, a charged pressure is controlled in stages to carry out an appropriate power control suitable for a number of stages of the transmission 30.

Abstract: A method and apparatus controls an internal combustion engine having electromagnetically driven valves. A target cylinder torque required of one of a plurality of cylinders is individually calculated in accordance with a target engine torque, and a timing for opening and closing each of a plurality of intake and exhaust valves in each of the plurality of cylinders is determined in accordance with the target cylinder torque. Thereby the torque of the internal combustion engine is individually controlled for each of the plurality of cylinders.

Abstract: A system and method is described for controlling vehicle bouncing of a vehicle having an engine driving wheels through a transmission having multiple gear ratios. The vehicle has a fuel control unit for supplying a variable amount of fuel to the engine in response to fuel control signals generated by an engine control unit. The method includes generating a control code as a function of a gear ratio of the transmission; sensing vehicle acceleration with an accelerometer mounted on the vehicle and generating an acceleration signal in response to motion of the vehicle. The fuel control signal is generated as a function of the control code, the acceleration signal and a frequency dependent transfer function value. The fuel delivered to the engine is modified as a function of the fuel control signal.

Abstract: A system is disclosed for implementing a technique for managing torque of a drivetrain. The drivetrain includes an air intake passage having a throttle valve, an internal combustion engine having an output shaft, a transmission having an output shaft, and a rotational propulsion member operatively coupled to the transmission by a propeller shaft and a drive axle. The system includes a throttle valve sensor, an engine speed sensor, a transmission speed sensor, a vehicle speed sensor, a transmission controller, and an engine controller. The throttle position sensor provides a throttle position signal that is indicative of a rotational position of the throttle valve. The engine speed sensor provides an engine speed signal that is indicative of a rotational speed of the engine output shaft. The transmission speed sensor provides a transmission speed signal that is indicative of a rotational speed of the transmission output shaft.

Abstract: The present invention is directed toward a method to digitally control a transfer case through a digital data bus to provide synchronized low to high shift capabilities in vehicles that employ a controller area network (CAN) system. In addition, a transfer case that can be digitally controlled in a vehicle with a controller area network (CAN) system to provide synchronized low to high shifts is also disclosed.

Abstract: A propulsion system designed for hybrid vehicles utilizing a first torque path from a coupled motor generator system and internal combustion engine through and automatically shifted manual transmission having a secondary torque path from a secondary torque source to the wheels. The system incorporates the high-efficiency of a manual transmission with the smoothness of the most advanced automatic transmissions by utilizing a second torque path to maintain driver requested torque during shifts and braking requests.

Abstract: A preventive ECU of a control unit for a vehicle provided with a power source and a continuously variable transmission controls an ECU for controlling an engine and an ECU for controlling a CVT to perform control of output torque of the engine, control of gear change of the CVT and control of a period for backlash preventive control. When the relationship of the portion including the engine and the CVT and a portion including wheels (the vehicle) is alternately changed from a driven state and a driving state, backlash which is present in the drive system and which causes vibrations in the longitudinal direction is canceled before acceleration control of the vehicle and control of backing or transient surge are performed. The control unit for a vehicle is able to sufficiently reduce vibrations of the vehicle in the longitudinal direction and prevent discomfort for a person in the vehicle by canceling the backlash of the drive system.

Abstract: An input torque limiting device for an infinitely variable transmission connected to an engine, wherein the transmission can vary a speed ratio up to infinity. In the input torque limiting device, the maximum torque which can be input is computed according to the output/input speed ratio which is an inverse of the speed ratio, without adversely affecting the durability and performance of the infinitely variable transmission, and the engine torque is controlled not to exceed the maximum torque. In this way, in the infinitely variable transmission, input of an excessive torque when the speed ratio is in the vicinity of infinity is prevented.

Abstract: A work vehicle such as an agricultural tractor includes means for the operator to select between manual or automatic engine speed control and to select among multiple automatic modes each having a different amount by which the engine speed is reduced when the load is reduced and the transmission is up-shifted to maintain the vehicle ground speed. This enables the operator to match the degree of engine speed reduction to the particular task at hand for improved performance and productivity. Preferably, the transmission is an infinitely variable transmission whereby the engine speed and the transmission can both be varied infinitely.

Abstract: A vehicular power-transmission control system comprises a continuously variable transmission CVT, which transmits the output of an engine E to wheels, a starting clutch 5, which controls the transmission of power in the continuously variable transmission, an electrical motor generator M, which can assist the engine in rotational drive, and a hydraulic pump P, which is connected to the output shaft of the engine. When the vehicle, which has come into a halt with the engine consequently stopped in an idling elimination control, is to be restarted, the power-transmission control system controls the electrical motor generator to rotate the output shaft of the engine, to which fuel supply is not allowed, thereby to drive the pump. Thereafter, when the starting clutch receiving a hydraulic pressure from the hydraulic pump starts its engagement, the power-transmission control system starts the operation of the engine.

Abstract: A motor vehicle has a transmission controlled by an electronic transmission unit and an internal-combustion engine controlled by an electronic engine unit. The transmission unit normally shifts the selected gear by controlling actuators in the transmission, as a function of the adjustment of a gear selection switch. In an emergency, which can be detected by the engine unit via a communication connection with the transmission unit, and in which the adjustment of the gear selection switch is not detected by the transmission unit and/or the selected gear cannot be shifted in the transmission, the engine unit enforces a limitation of vehicle acceleration.

Abstract: A method is described for limiting a change in torque transmitted through a vehicle powertrain when in a predetermined range. Such a method minimizes transmission gear separation, or “clunk”. In one approach, the rate cf change of powertrain output is limited when powertrain output is near zero transmitted torque. The limitation is not used under other circumstances so as not to hinder driver performance.

Abstract: A vehicle drive apparatus has a pump that supplies operating fluid for performing speed shift control of a power transfer apparatus, and a driving motor that drives the pump. If it is determined that the power transfer apparatus is in a neutral state (N range), it is then determined whether the vehicle is running. If the vehicle is running, it is determined whether the operation speed of the driving motor has reached a speed that allows the pump to produce a predetermined fluid pressure. If that speed has not been reached, the motor operation speed is controlled to the speed that allows the pump to produce the predetermined fluid pressure. The vehicle drive apparatus secures a pressure and a flow of fluid when the power transfer apparatus is operated to the neutral state during the running of the vehicle.

Abstract: There is provided an ignition timing control system and method and an engine control unit for an internal combustion engine, which are capable of setting optimum timing for execution of retardation of ignition timing when a vehicle on which the engines is installed is accelerated, thereby effectively reducing longitudinal vibrations of the vehicle, which might be caused by torque fluctuations, and maintaining acceleration performance. An acceleration demand-detecting module detects a demand of acceleration of the engine. A rotational speed-detecting module detects a rotational speed of the engine. A rotational variation amount-calculating module calculates a variation amount of the rotational speed of the engine, based on the detected rotational speed of the engine. A rotational variation amount differential value-calculating module calculates a differential value of the variation amount of the rotational speed of the engine, based on the calculated variation amount of the rotational speed of the engine.

Abstract: A system and method is described for controlling vehicle bouncing of a vehicle having an engine driving wheels through a transmission having multiple gear ratios. The vehicle has a fuel control unit for supplying a variable amount of fuel to the engine in response to fuel control signals generated by an engine control unit. The method includes generating a control code as a function of a gear ratio of the transmission; sensing vehicle acceleration with an accelerometer mounted on the vehicle and generating an acceleration signal in response to motion of the vehicle. The fuel control signal is generated as a function of the control code, the acceleration signal and a frequency dependent transfer function value. The fuel delivered to the engine is modified as a function of the fuel control signal.

Abstract: A control apparatus of an automatic transmission capable of achieving a smooth change of output shaft torque to torque which can be generated by a friction clutch, thus enabling a smooth gear change even if the output shaft torque is high at the gear change. If the output shaft torque exceeds limit transmission output shaft torque obtained by multiplying a torque capacity of the friction clutch by a gear ratio provided for the friction clutch when a gear change command is issued in the automatic transmission, engine torque is controlled so as to make the output shaft torque decreased to the limit transmission output shaft torque, and then the engine torque control is switched when the output shaft torque decreased to the limit transmission output shaft torque to start the gear change operation.

Abstract: A powertrain having a controller for limiting the torque and power inputs to a transmission as determined by operating parameters and design features of the transmission. These parameters and design features include torque limits for various components in the transmission, torque ratio of the torque converter, the design K factor of the torque converter, gear ratios of the transmission, operating condition of the torque converter clutch, and input power limits for the transmission. A programmable digital computer includes a subroutine that evaluates and establishes torque limits and input speed limits from the design features and operating parameter. The controller sets the limits for each transmission ratio including reverse such that a family of transmission can be coupled to a single engine design without overpowering the transmission should the engine be capable of greater output power than the transmission can accept.

Abstract: An anti-rollback system for an automatic transmission includes an output gear connected to an output shaft of the automatic transmission, and a magnetic sensor for detecting output rpm of the output gear. The magnetic sensor is electrically connected to an. ECU (electronic control unit) and the output gear has a plurality of teeth, each tooth having a slot formed on its upper surface thereof.

Abstract: A method for controlling a transmission of an engine-driven vehicle having a plurality of gears, the vehicle including a service module actuable by a driver of the vehicle to select a desired gear, the service module being connected to a transmission control system which automatically changes gears in response to actuation of the service module, the vehicle further including an engine braking system connected to the transmission control system which is actuable to brake the vehicle engine during a gear change, the method comprising: monitoring the transmission input rotational speed (NE) and the transmission output rotational speed (NA); calculating a synchronous rotational speed (NE) of the desired gear; actuating the engine braking system to reduce the rotational input speed (NE) and synchronize it with the synchronous rotational speed (NS) so that the desired gear change can be effected; and disabling the engine braking system when a predetermined switch-off threshold is reached at a point in time before a