Loading patent…
AssigneeGM Global Technology Operations LLC
InventorsGoro Tamai, William L. Aldrich, III, Nathaniel S. Epperly
Estimating the term…
Provided is an intake manifold pressure control apparatus, or vacuum pump, for a hybrid propulsion system. The vacuum pump is operable to evacuate the intake manifold of an internal combustion engine, thereby lowering the Manifold Absolute Pressure, or MAP, to a predetermined level to enable a quick restart of the internal combustion engine. This vacuum pump may also be used to evacuate hydrocarbons, or HCs, from within the intake system to prevent evaporative emissions from the intake manifold upon engine shutdown. In the preferred embodiment, the vacuum pump is operated by a motor that can simultaneously operate an auxiliary transmission oil pump. Additionally, the present invention provides a method of controlling the hybrid propulsion system to enable the manifold pressure control apparatus to lower the MAP value within the intake manifold as well as a method of evacuating HCs from the intake manifold upon engine shutdown.
A method of controlling a hybrid propulsion system having a transmission, an internal combustion engine, an ignition switch operable to shut off the internal combustion engine, and an intake system in communication with the internal combustion engine, the intake system including an intake manifold, said method comprising:
Dependencies are inferred from the claim text.