Patent ID: 8015810

Claim:
A method of supplying a supplemental oil flow to a turbocharger in an electric hybrid vehicle including an electric machine and a turbocharged engine, the method comprising: delivering oil to an accumulator from an engine oil pump through an inlet line; storing oil in said accumulator at a first pressure greater than atmospheric pressure when said engine oil pump is stopped; controlling operation of the electric machine and the turbocharged engine with at least one control module; monitoring an operating condition of the engine; and opening and closing a control valve disposed in an outlet line between said accumulator and said turbocharger to selectively allow oil stored in said accumulator to flow to the turbocharger through said outlet line without flowing through said turbocharged engine to selectively supply stored oil at said first pressure to the turbocharger based upon said operating condition of the engine, wherein said outlet line is separate from said inlet line and said operating condition is at least one of an engine shutdown, an impending engine shutdown, an impending engine startup, and an oil pressure produced by operation of said engine oil pump driven by operation of said engine.