Electro-hydraulic propulsion system combined power module

A vehicle drive system, comprising

• a battery;
• a main power unit in a housing, comprising:
• two independent electric motor/generator, capable of being driven as a motor by the battery or of charging the battery as a generator;
• at least one hydraulic motor/pump, capable of being driven by the electric motor/generator to pressurize hydraulic fluid, or of being driven by pressurized hydraulic fluid to power the motor generator as a generator;
• a hydraulic rail communicating the pump;
• and
• directional control valves communicating with the hydraulic rail;
• two independent electric motor/generators, each electric motor/generator capable of being driven as a motor by the battery or of charging the battery as a generator, each electric motor/generator connected to a separate hydraulic motor/pump, the independent electric motor/generators and their connected hydraulic motor/pumps capable of acting independently;
• two hydraulic motor/pumps, each coupled to a respective electric motor/generator, capable of being driven by the respective electric motor/generator to pressurize hydraulic fluid, or of being driven by pressurized hydraulic fluid to power the motor/generator as a generator;
• a hydraulic rail communicating with the hydraulic motor/pumps directional control valves;
• at least one accumulator for storing pressurized hydraulic fluid;
• wheel drives capable of being driven by pressurized hydraulic fluid;
• a hydraulic circuit connecting the directional control valves of the motor housing to the accumulator and wheel drives;
• and
• a control system for controlling the operation of the battery, power unit and wheel drives.