Gm Global Technolgoy Operations, Inc.

Guy E La Falce

James R Yurgil

Kulwinder Singh

Werner K Baumgartner

Joel J Anderson

An extended engine off passenger climate control system utilizes an advanced temperature control module in combination with modifications to the conventional heating/ventilation/air conditioning (HVAC) system to provide occupants in the passenger cabin of a hybrid electric motor vehicle with adequate heat or air conditioning for up to two minutes after the gasoline engine is turned off. A two stage orifice between the condenser and the evaporator of the air conditioning system slows the equilibration of the pressures on the high pressure side and low pressure side of the air conditioning system when the air conditioner compressor is turned off, allowing the passenger cabin to continue receiving cooling air even when the gasoline engine, and thus the compressor, is off. An auxiliary engine coolant pump circulates heated engine coolant through the heater core when the gasoline engine is turned off, thus providing heat when conditions require passenger cabin heating.

Extended engine off passenger climate control system and method

A radiator includes a neck including a pair of openings and a plurality of threads configured to engage a plurality of threads disposed within a radiator cap. The neck threads and the radiator cap threads each include a thread stop and a clearance and permit the radiator cap to rotate to a fully closed position. The clearance permits the radiator cap to move in an axial direction when not in the fully closed position without rotating from the fully closed position. The thread stops are configured prevent the radiator cap from rotating after moving axially.

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Sterling Heights, MI, United States of America

Guy E La Falce