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If the signal from each input sensor or switch indicates that the engine cooling water temperature is lower than 24C, or if the following conditions occur, such as the throttle is suddenly opened and closed or even completely closed, the atmospheric pressure is lower than 66.66kPa, the car is braking, When the car is downshifting from the fourth gear to the second gear and upshifting from the second gear to the third gear, the lockup clutch will not generate lock.
In addition, because the failure of the input device (such as a sensor or switch) will endanger the function of the electronic control system, the system will automatically switch to the failure mode control state when an input sensor or switch fails, and at this time, it will not Locking occurs when the lock is released from the table.
Similar to Chrysler's practice, when the engine's cooling water temperature rises above the specified lower limit (24°C), the throttle position sensor and the vehicle speed sensor will become the key input devices that determine whether the lock-up clutch is locked or not. At this time, the electronic control unit will make its control decision based on the two sets of throttle opening as a function of the vehicle speed curve.
If the car is traveling in third gear, the lockup clutch of the torque converter can be locked at a speed of only 43km/h when the throttle opening is small, and when the throttle opening is large, unless the driving speed is as high as 89km. /h, otherwise lock will not occur. When the car is traveling in the fourth gear, if the throttle opening is small, the speed of the lockup clutch is 56km/h; and when the throttle opening is large, unless the speed reaches 89km/h, the lock is locked. Will not happen. In addition, the throttle opening corresponding to the lockup of the torque converter lockup clutch in the third gear state is greater than 8% and less than 59% from the auto-idle position: in the fourth gear state, The throttle opening is changed to more than 5% and less than 45%. There is also a lock-up hysteresis zone.
In general, the conditions required for the occurrence of the lockup are a small throttle opening and a high speed, and once it has been locked, before releasing the lock, it should be allowed to have a larger value in order to improve the drivability of the vehicle. Throttle opening and lower speeds appear.
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