The fuel supply part of the car includes a filter, an oil supply pump, a main pressure regulating valve, a second pressure regulating valve, an oil cooler, and the like. Among them, the main regulator valve is based on the throttle opening and the position of the selector lever, the oil pump output pressure is adjusted to the specified value, resulting in a stable working hydraulic pressure. The role of the second pressure regulating valve is to regulate the hydraulic pressure supplied to the torque converter and the lubricating oil circuit. When the engine stops rotating, the hydraulic circuit of the torque converter is closed to maintain a certain work in the torque converter. Liquid volume, so that the torque can be normally transmitted during the restart work.
Hydraulic automatic control system usually consists of oil supply, manual gear selection, parameter adjustment, shift timing control, shift quality control and other components. In the hydraulically controlled hydraulic automatic transmission, the throttle valve pressure regulating valve (referred to as a throttle valve) and the speed control pressure regulating valve (also referred to as a governor) are mainly included in the parameter adjustment section. Throttle pressure control valve makes the output hydraulic pressure can reflect the throttle opening; speed control pressure regulator makes the output hydraulic pressure can reflect the size of the speed. The above two hydraulic pressures are used as the control hydraulic pressure respectively at both ends of the shift valve (transmission valve) to play a role in controlling the shift of the shift valve.
The role of the shift quality control part is to make the shift process more smooth and soft, generally including an accumulator damper, a buffer valve, a reverse quick oil valve, a timing valve, and an execution force adjustment valve on the hydraulic passage.
The shift timing control section is mainly a shift valve for shifting the oil path leading to each shift actuator (clutch and brake) to achieve shift control. The lock signal valve is controlled by the solenoid valve and can output a hydraulic signal to control the lock relay valve . The lock relay valve changes the flow direction of the working fluid to the torque converter according to the lock signal of the lock signal valve, so that the torque converter can be The lockup clutch is timely engaged and disengaged.
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