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CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual 175
Centrifugal governor The centrifugal governor is installed on and rotates along with the driven shaft. The governor is used to produce the oil pressure on the governor to provide an oil pressure varying with the vehicle speed for the control system.
Three-level governor
Condition I. The oil pressure provided by the main oil circuit from position 3-2 valve to position 1 valve does not change. The valve rotates together with the driven shaft. The slide valve and centrifugal block moves outwards under the centrifugal force and opens the oil inlet. Thus, the pressure of the main oil circuit comes into the governor to cause oil pressure on the governor. Meanwhile, the governor’s oil pressure acts on the slide valve and closes the oil inlet somewhat until the oil pressure of the governor is balanced with the centrifugal force on the slide valve.
Condition II. Since the centrifugal block integrated with the slide valve in the governor has a greater mass and centrifugal force and along with an increased vehicle speed, the oil pressure on the governor that is balanced with the centrifugal force is also increased dramatically until the centrifugal block stops to move outwards.
Condition III. When the centrifugal block stops to move outwards, the slide valve could not move outwards under its own centrifugal force. Due to the slide valve’s small mass, its centrifugal force increases slowly along the RPM changes. Hence, the oil pressure of the governor that is balanced with it also changes little. The governor’s oil pressure changes along with the vehicle speed’s changes so that
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