I am converting an SUV to electric motor powered. When the transmission needs to shift I can cut the power to the motor, "disengaging" it from the transmission. Additionally, the motor doesn't idle, so I have no way to keep hydraulic pressure in the transmission at a standstill. I want to remove the torque converter and power the hydraulic pump externally. Is this possible, or can I use an external pump?|||The way an automobile engine with a automatic transmission works is essentially a hydrostatic hydraulic system. If you have for example, a 200 hp engine the engines output is connected to the automatic's transmission hydraulic pump. So that pump is actually consuming all the energy of that engine and the hydraulic flow is directed to the torque converter and gears to give motive power.
You could bypass the transmissions built in hydraulic pump, but it is difficult and a waste of a good pump. A better solution might be to keep the excellent efficient pump that is built into the transmission and come up with a diverter of the hydraulic flow so that when you don't need the flow it just loops around in a flow circuit.
This is similar to a power steering pump which doesn't consume power when it is on, but the moment you turn the wheel a hydraulic valve is opened and the hydraulic fluid is allowed to flow into a cylinder and turn the car wheels in the direction you point to
So if you can get a diagram of your SUV's automatic transmissions hydraulic circuitry, you can buy a hydraulic valve in between the hydraulic pump and the torque convertor. So when you don't want the transmission to add to the drag, just divert the flow away from the converter and loop it back to the pump.
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