With the continuous development of automatic transmission technology, merely relying on simple hydraulic control or electrical control to engage or disengage the lock-up clutch exposes many problems. Therefore, American General Motors Corporation took the lead in adopting the electronic control of the lock-up clutch in 1891, and other automobile manufacturers soon followed. So far, it can be said that almost all hydraulic lock type clutches are electronically controlled.

For the electronically controlled lockup clutch, the lockup piston action is controlled by the lockout solenoid valve and one or more slide plunger valves. When the lockup occurs or is released, the solenoid valve controls the sliding plunger. The valve is actuated by the oil pressure signal, and the sliding plunger valve actually controls the oil pressure for engaging and disengaging the clutch piston. Since the electronic control means or method of the automatic transmission lock-up clutch of each major automobile manufacturer has its own characteristics, the following are selected to introduce several representative ones.

Chrysler's lock-up clutch electronic control

In 1986, Chrysler Automotive adopted the electronic control of the lock-up clutch. The hydraulic circuit portion of the control system and its lockup solenoid valve are controlled by the electronic control unit via a lockup clutch relay. As to the source of the electronic control unit's decision whether to lock, it is the cooling water temperature sensor, the vacuum sensor, the vehicle speed sensor and the throttle closing switch. Usually, lock-up occurs only when the engine cooling water temperature is higher than 6o6C, the vehicle travel speed is higher than 6k4m/h, and the engine intake manifold vacuum is about 26.66-66.66kPa. When the water temperature sensor indicates that the temperature of the engine cooling water rises above 66° C., the electronic control unit can determine whether to lock the lock-up clutch in the torque converter according to the signals from the throttle closing switch, the vehicle speed sensor, and the vacuum sensor. .

Whenever the throttle closure switch is closed, the electronic control unit will not energize the lockout solenoid valve and therefore will not lock the clutch. There is no doubt that the function of the switch is to inform the electronic control unit to unlock the lock-up clutch. To reduce exhaust pollution and increase fuel economy when closing the throttle decelerating.

In order to prevent repeated energization and de-energization of the lock-up solenoid valve during a brief opening and closing of the throttle, a part of the electronic control unit program ensures that the engagement of the lock-up clutch is delayed for a given period after the throttle closure switch is opened. time.

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