Patent ID: 8069845
Filing Date: 2011-12-06
Classification: F01N,F01P,F02B,F02D,F02M,Y02T

Abstract:
1. A gasoline direct injection engine, comprising: a fuel rail; fuel injectors coupled to the fuel rail and supplying fuel into engine cylinders; an engine coolant circuit including a coolant pump to circulate coolant through a coolant jacket in the engine wherein a fuel rail branch from the coolant circuit is provided to the fuel rail and the fuel rail branch is coupled to a portion of the coolant circuit proximate an exhaust duct; an electronic control unit (ECU) electronically coupled to the engine and the coolant pump; and an auxiliary coolant pump coupled to the engine coolant circuit and electronically coupled to the ECU, the ECU commanding the auxiliary coolant pump to circulate flow in the engine coolant circuit based on temperature of engine coolant within the engine being above a first threshold temperature and below a second threshold temperature.