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What is the role of the automatic transmission shift solenoid valve?

Time: 2018-08-03

自动变速箱换挡电磁阀

  

The role of the automatic transmission shift solenoid valve:

Solenoid valves N88, N89, N90, N92, N94 are on-off valves that act to open or close an oil passage; N88, N89, N90 are shift solenoid valves, controlled by the control unit, and then control the hydraulic on-off valve Change to a certain gear; N92, N94 is a shifting smoothing valve, the role is to ensure smooth shifting process.

The solenoid valves N91 and 93 are oil pressure regulating valves, which are used to adjust the pressure of the oil; N91 is the lock-up clutch hydraulic pressure regulating valve, the control unit adjusts the lock-up clutch pressure by N91; N93 is the clutch and brake oil pressure regulating valve. The control unit adjusts the clutch and brake oil pressure by N93.

If any of the solenoid valves fails, the control unit has no substitute function, but the transmission has a home function in the mechanical design. When the control unit does not work, the solenoid valve plug or the multi-function (gear) switch plug, component failure, etc., Both enter the emergency operation; that is, the shift lever is placed in the “D, 3, 2” position, regardless of starting and driving, the third gear; the shift lever is placed in the “1” position, driving in the first gear; the shift lever is placed in the “R” position. , driving in reverse gear.


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