High performance turbo-hydraulic compressor
Use of the hydraulically driven device in a series configuration with a minimally restrictive turbocharger is defined which will allow a very responsive and powerful boosting system to reach boost levels of 4-5 pressure ratio (PR) to support and enable OEM engine downsizing trends. An electric supercharger is also considered. A hydraulic drive assists to increase the acceleration rate of a turbocharger impeller/turbine shaft assembly and provide a secondary means of driving the compressor impeller at lower engine speeds where exhaust gases alone does not generate adequate shaft speeds to create significant induction boost. The hydraulic circuit includes a dual displacement motor, which provides high torque for acceleration yet converts to a single motor for high-speed operation. When the exhaust driven turbine function allows compressor speeds, beyond which the hydraulic system can contribute, a slip clutch allows disengagement of the hydraulic drive. In an alternative embodiment, the hydraulic drive provides means of forced induction air alone.
1. An automotive forced air induction system operative to boost inlet air pressure of an internal combustion engine comprising:
a turbocharger including an exhaust driven turbine and a centrifugal air compressor driven by said exhaust driven turbine;
hydraulically driven air compressor having an inlet and an outlet; and
a bypass for induction air arranged in parallel with said hydraulically driven air compressor and operative to open when air pressure at the outlet of the hydraulically driven compressor is less than at the inlet of the hydraulically driven compressor.
2. The system of claim 1 further comprising:
an intercooler disposed downstream of said hydraulically driven compressor,
wherein said bypass for induction air is configured to enable air movement parallel to the series combination of said hydraulically driven air compressor and said intercooler.
3. The system of claim 1 , wherein said bypass comprises a check ball assembly.
4. The system of claim 1 , wherein said bypass comprises a flapper check assembly.
5. The system of claim 1 , further comprising:
a hydraulic pump operative to drive said hydraulically driven air compressor in mechanical coupling to the engine; and
a controllable clutch operative to selectively disengage coupling of said pump from said engine.
6. The system of claim 5 , further comprising:
a control mechanism operating said controllable clutch dependent on a pressure drop measured across said bypass.