Patent ID: 7458364
Filing Date: 2008-12-02
Classification: F02M

Abstract:
1. An internal combustion engine having a fuel injection system which delivers fuel directly into a combustion chamber for mixing with charge air delivered separately to the combustion chamber via an inlet valve, the fuel injection system comprising: a fuel injector which functions as a positive displacement pump and dispenses in each operation thereof a set quantity of fuel; a mixing chamber into which the fuel injector dispenses fuel; and a gas supply passage for supplying gas to the mixing chamber to entrain the fuel dispensed into the mixing chamber in a flow of gas which passes through the mixing chamber into the charge air; wherein: the mixing chamber is connected to the combustion chamber to deliver fuel and gas into the combustion chamber separately from the charge air and a depression in the combustion chamber is used to draw gas through the gas supply passage into the combustion chamber; and the inlet valve controls flow of charge air into the combustion chamber and the inlet valve is kept closed for an initial part of an intake stroke of the engine so that the depression is created in the combustion chamber; and an electrically-operated valve is provided to control flow of gas from the gas supply passage through the mixing chamber.