摘要:
A method and a apparatus for operating an automatic synchronized transmission for motor vehicles. The transmission having a countershaft design, with a countershaft parallel to input and an output shafts, which communicate with each other and the countershaft by means of gear wheel pairs. The transmission further having at least one coupling and synchronization device for at least one idler gear, with the aid of which at least one idler gear can be rotationally fixed to a transmission shaft, such that when the motor vehicle is stationary and a starting gear is engaged, torque of the countershaft is not drive-effectively reduced. Thus, ensuring that when the starting gear is engaged, no undesired acceleration of the vehicle occurs.
摘要:
A method of determining an application point of an automatically actuated clutch of an automatic mechanical transmission. After pre-selecting a new gear, the clutch automatically separates, the activated gear disengages, the engine rotational speed is brought to a target value for the new gear and the clutch, with higher advancing speed, is advanced to an application point at which the transmission input shaft is precisely entrained. To determine the application point, the gradient of the time curve of the rotational speed of the transmission input shaft is monitored, an important change of the gradient, that adjusts itself when reaching the application point, is determined and the current position of the clutch is defined as the application point. The application point is determined during downshifts, the time rotational speed curve of the transmission input shaft is between slowdown and re-acceleration, which is easily and accurately determined.
摘要:
A transmission system including a shift mechanism for operating and controlling the transmission system. To automatically detect geometric characteristic values of the transmission system or of the shifting device a selector motor and a shift motor actuate a selector finger that is displaceably mounted in a selection-shift-passageway layout. Starting from an initial position whose coordinates within the selection-shift-passageway layout are unknown, the selector finger is displaced in the directions of shifting and in the directions of selection in order to detect paths of movement in the direction of selection or shifting. The selector finger is repeatedly displaced to establish the maximum paths of movement until the predetermined transmission geometric characteristic values are completely detected. Also disclosed are a control device for controlling a transmission system that includes a shift mechanism, and a method for controlling such a transmission system.
摘要:
The invention relates to a method of compensating for the influence of changes of speed of a rotary component of an adjustable clutch upon the control torque characteristic curve of the clutch in the power train of a motor vehicle wherein the clutch operates between the rotary output element of the engine or another prime mover and a rotary input element of a change-speed transmission. The method includes the steps of monitoring the rotational speed of the clutch and varying the required positions of a mobile adjusting member for the clutch as a function of changes of the monitored rotational speed. The invention also relates to the power train wherein the influence of changes of rotational speed of the aforesaid component upon the characteristic curve can be varied in accordance with the novel method.
摘要:
The method is designed for a motor vehicle equipped with wheel rpm sensors and means to determine whether the wheels are either rolling normally or locked or spinning without adhesion. The method employs plausibility routines to determine whether an abnormal wheel rpm sensor signal is due to locking or spinning of the wheel or whether it is due to a sensor failure. In case that an abnormal condition is detected, an alternate strategy is initialized to determine wheel rpm rates and perform control functions that are based on wheel rpm rates.
摘要:
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.
摘要:
A method of regulating the position of a clutch actuator in a vehicle employs the concept of adapting the servo-loop parameters of a position controller of the clutch to different operating conditions of the vehicle, as well as the concept of applying and continuously adapting a bias current of the actuator motor in order to avoid or minimize the incidence of a hunting or after-regulation behavior of the control loop and to thereby minimize the energy consumption of the actuator motor.
摘要:
In a method and apparatus for diagnosing a malfunction in a clutch actuator of a motor vehicle, the actual position of the clutch actuator is measured by a position sensor. Simultaneously, an estimated position of the clutch actuator is calculated by an emulation unit that emulates the function of the clutch actuator. Malfunctions of the clutch-actuator are diagnosed by comparing the actual, measured position to the estimated position.