Patent ID: 7779634

Claim:
A system comprising: a controller; an electrically assisted turbocharger that comprises an electric motor controllable by commands received from the controller; and a flow path that comprises a first opening to an air intake path of an engine, the first opening positioned downstream from a compressor of the turbocharger; a second opening to an exhaust path of an engine, the second opening positioned upstream from the turbine of the turbocharger; and a valve that regulates flow from the intake air path to the exhaust path, the valve controllable by commands received from the controller wherein the controller is configured to receive at least compressor outlet pressure information and to receive compressor wheel rotational speed information, wherein the controller includes control logic for controlling the valve and for controlling the electric motor of the electrically assisted turbocharger, based at least in part on received information, wherein the control logic acts to avoid compressor surge by coordinating control of the valve and the electric motor to increase compressor map width by controlling the valve to allow or increase flow from the air intake path to the exhaust path and by controlling the electric motor to maintain or increase compressor wheel rotational speed.