Patent ID: 7987940

Claim:
A hydraulic hybrid motor vehicle, comprising: a vehicle frame; drive wheels rotatably mounted on said vehicle frame; a high pressure hydraulic pressure accumulator mounted on said vehicle frame, for storing energy in the form of pressurized and compressed fire-suppressing gas against a pressurized fluid; a low pressure hydraulic pressure accumulator mounted on said vehicle frame, also storing pressurized and compressed fire-suppressing gas against a fluid, but at a pressure lower than in the high pressure hydraulic accumulator; a hydraulic motor mounted on said vehicle frame, said hydraulic motor being driven at times by pressurized fluid from the high pressure accumulator to provide motive power for operation of the vehicle; a thermal device, operating to prevent escape of pressurized and compressed fire-suppressing gas from the low pressure hydraulic pressure accumulator unless the temperature exceeds a determined level for safety, at which point the thermal device operates to allow fire-suppressing gas to escape from the low pressure hydraulic pressure accumulator.