Ford Motor Company’s Lock-up Clutch Electronic Control
The electronically controlled lock-up clutch used by Ford Motor Company can be divided into two types according to the working mode. Each is represented by the system on the AXOD type automatic transmission and the A4I-D type automatic transmission, which are introduced below.
Electronic control of the lock-up clutch of the AXOD type automatic transaxle. In the 4-speed AXOD type automatic transaxle, the lock-up clutch of the hydraulic transmission can be locked when driving in the third or fourth gear, and the lock-up solenoid valve is controlled by this It is controlled by the company’s fourth-generation engine electronic control system (EEC-IV). The lock input signal used by the control system comes from the engine cooling water temperature sensor, the throttle position sensor, the vehicle speed sensor, the atmospheric pressure sensor, the brake switch, the third and second gear pressure switch, the fourth and third gear pressure switch and the neutral gear. Pressure Switch.
Among the above sensors and switches, the throttle position sensor provides the electronic control unit with an electrical signal that changes according to the percentage change of the throttle opening; the atmospheric pressure sensor is located in the engine compartment, and the electrical signal it provides varies depending on the atmospheric pressure. ; The brake switch is located at the brake pedal. When the foot brake is used, it will provide the electronic control unit with a switch signal indicating that the foot brake is in use.
In addition, there are several pressure switches in the electronic control system. Their function is to provide the electronic control unit with a switch signal for a given gear shift situation. The lock-up solenoid valve is installed on the valve body of the automatic transmission bridge. When the solenoid valve is not energized, it will release the oil pressure that could be used to make the lock-up clutch work, thereby preventing the clutch from being locked; After energizing, the drain port is closed, forcing the main oil line pressure to act on the lock-up plunger valve, and then the lock-up clutch is locked.
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