operation of one speed control valve. transmission control valve n-range operation transmission...

Operation of One Speed Control valve

Transmission control valve N-range operation

Transmission Control valve

Once the engine has been started the transmission oil pump will begin to supply the control valve with hydraulic oil.

From Pump


The oil will follow the path of least resistance.


Regulator


Accumulator


Inching Spool


Filter


The oil has now filled all of the open channels in the control valve.

DirectionalSolenoid


The accumulator is now the point of least resistance and absorbs the pressure from the oil.

Accumulator


The oil will continue to compress the accumulator fully.


Once the accumulator is fully compressed, the oil will continue to the next location of least resistance.


The regulator now begins to open.


Regulator

Once the regulator is open the oil is sent to the torque converter.

Torque Converter Supply


As the oil heads to the torque converter the pressure in the control valve will drop.


The accumulator will compensate for this pressure loss.


The control valve is now ready for directional operations.


Reverse gear has been selected.


The directional solenoid moves the spool and directs the oil to the reverse clutch pack.


DirectionalSolenoid

The pressure drops when the oil is sent to the R clutch pack.


The accumulator enters operation.


The clutch pack will not be fully engaged until the accumulator has completed its operation.


The clutch pack is now fully engaged.


Inching pedal has been pressed.


Inching Spool

This will move the inching spool which will cut off oil supply to the clutch pack.


The oil will be returned back to tank via the tank port.


There is no oil pressure in the R clutch pack now. The clutch is disengaged.


Inching pedal released. Oil will be sent to the clutch pack again.


Once again the pressure drops when the oil is sent to the R clutch pack.


The accumulator enters operation.


The clutch pack is fully engaged.


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