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Reducing Engine Bearing Wear Of Hybrid Vehicles Disclosure Number: IPCOM000010920D
Publication Date: 2003-Jan-31

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The stop/start strategy of a hybrid electric vehicle can cause continuous crankshaft and connecting rod bearing wear that degrades the engine's durability. By pulsing high pressure oil to the crankshaft before starting, this wear is minimized. The high oil pressure can be stored in an accumulator that is charged by the standard oil pump. The oil pump typically pumps more oil than needed particularly at high speeds. The excess oil goes through a bypass valve, and, in a conventional engine, the energy is wasted. In this invention, the bypass line is redirected to an accumulator. This accumulator stores this maximum oil pressure from the pump and pressurizes it further with a diaphragm or piston.