Dual hydraulic machine transmission

A method of replacing an automatic transmission in a transmission well of an automobile having an engine, an engine drive shaft driven by the engine, and a wheel drive shaft for driving a plurality of wheels to move the automobile, the method comprising the steps of:

• a) disconnecting the automatic transmission from the engine drive shaft and the wheel drive shaft;
• b) removing the automatic transmission from the transmission well;
• c) placing a hydraulic transmission comprising a pump and a motor completely within the transmission well;
• d) attaching the engine drive shaft to the pump and the wheel drive shaft to the motor;
• and
• e) providing a computer control to control operation of the hydraulic transmission;
• wherein the hydraulic transmission replaces the automatic transmission and converts torque and power from the engine to provide enough torque and power to the wheel drive shaft to move the automobile from a stationary state to a highway speed.

A method of controlling power to a wheel drive shaft of an automobile having an engine, a drive mode selector, an accelerator pedal, a brake pedal, and a transmission comprising a pump swash plate having an adjustable swash plate angle and a motor swash plate having an adjustable swash plate angle, the method comprising the steps of:

• a) measuring a drive mode selector position, an accelerator pedal position, and a brake pedal position;
• b) measuring an engine speed and an automobile speed;
• and
• c) controlling the pump swash plate angle and the motor swash plate angle based on the drive mode selector position, the accelerator pedal position, the brake pedal position, the engine speed, and the automobile speed while maintaining a constant engine speed within predetermined values of the pump swash plate angle and the motor swash plate angle.

A method of controlling power to a wheel drive shaft of an automobile having an engine having an auxiliary drive shaft extending from the front of and driven by the engine and a main drive shaft extending from the rear of and driven by the engine, the method comprising the steps of:

• a) driving a hydraulic module, comprising a hydraulic pump in a closed loop with a hydraulic motor, using the auxiliary drive shaft to produce a hydraulic output from the hydraulic motor;
• b) mechanically coupling the hydraulic output to the wheel drive shaft to provide power to the wheel drive shaft;
• and
• c) infinitely varying the power to the wheel drive shaft by adjusting a pump swash plate angle and a motor swash plate angle.