Patent ID: 6971364

Claim:
A fuel injection system for an internal combustion engine which operates with gasoline direct injection, the system comprising; a high-pressure fuel pump, a control unit ( 18 ), an intake tube ( 7 ) a first injection valve ( 9 ) for each cylinder ( 3 ) of the engine, and at least one second injection valve ( 15 ), the second injection valve ( 15 ) being operable to inject fuel into the intake tube ( 7 ), and further comprising an exhaust recirculation tube ( 13 ) feeding into the intake tube ( 7 ), and wherein the second injection valve ( 15 ) injects fuel into the intake tube ( 7 ) between the point at which the exhaust recirculation tube ( 13 ) feeds into the intake tube ( 7 ) and a combustion chamber ( 4 ) of the engine, the control unit being operable to selectively operate the second injection valve ( 15 ) in a manner such that fuel is injected into the intake tube ( 7 ) only when such injection is needed to keep the intake tube ( 7 ) clean.