In the A4LD type automatic transmission, when some condition occurs, the electronic control unit deactivates the lockup solenoid valve and releases the lockup of the lockup clutch. These situations include: engine cooling water temperature below 53°C or above 116°C, throttle valve fully closed, throttle valve open or closed abruptly, accelerator pedal pressed hard or full throttle, lower intake manifold vacuum The engine speed is lower than the set value, and the car brakes.
Specifically, when the engine cooling water temperature is lower than 53°C, the lock-up clutch is not locked, the engine can be fully warmed up, and the work load can be smoothly supported; when the cooling water temperature is higher than 116°C, the same does not occur. The purpose of locking is to reduce the load on the drive train and to help cool the engine. When the cooling water temperature is within the normal range, the electronic control unit will pay close attention to the electric signal sent by the throttle position sensor. If the signal indicates that the throttle valve is completely closed, the electronic control unit notifies the lock-up solenoid valve that the power is off, thereby closing the valve. Locking of the clutch is released during throttle to reduce engine emission pollution and improve fuel economy: If the signal indicates that the throttle opening is large or fully open, the electronic control unit will also inform the lock-up solenoid valve to shut off, so as to be faster Accelerate the vehicle and use its unique torque-increasing effect in the torque converter. As for the sudden and brief opening and closing of the throttle valve, the engagement of the lockup clutch is also released to prevent the lockup clutch from repeatedly operating during this period. Correspondingly in the electronic control unit, the memory program ensures that the lockup clutch operation is delayed for a period of time after a slight change in throttle position.
The electronic control unit in the system also pays close attention to the engine speed signal provided by the ignition sensor and the intake manifold vacuum signal provided by the intake manifold absolute pressure sensor, according to a function curve of the pre-memory in a program mode, if The engine speed drops below a certain function value at a lower vacuum level. The electronic control unit will inform the lock-up solenoid valve to de-energize, so as to ensure that from the premise of not locking the hydraulic torque converter, it will occur from four to three. The downshift of the gears is in order to obtain the best shift smoothness and softness.
In addition, in any case, as long as the electrical signal from the brake switch indicates that the driver is braking, the control unit of the electronic control system will also inform the lock-up solenoid valve to be de-energized to prevent damage to the engine during sudden braking.
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