FUEL INJECTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE

摘要

With reference to FIG. 1, the present invention provides an internal combustion engine comprising a variable volume combustion chamber (10), an air intake passage (18), a throttle (23), a bypass passage (28) which bypasses the throttle (23) and via which air and/or recirculated exhaust gas is supplied to the intake passage (18) via a delivery nozzle (27) located downstream of the throttle (23). A fuel injector (20) delivers fuel to a mixing chamber and the bypass passage (28) is connected to the mixing chamber so that air or recirculated exhaust gas flowing through the bypass chamber entrains fuel present in the mixing chamber and a resulting mixture is delivered to the intake passage (18) via the delivery nozzle (28).

主权项

1. An internal combustion engine comprising:
a variable volume combustion chamber; an air intake passage supplying air to the combustion chamber via an air intake valve; a throttle provided in the air intake passage for throttling flow of air through the air intake passage; a venture formed in the air intake passage downstream of the throttle; a bypass passage which bypasses the throttle and via which air and/or recirculated exhaust gas is supplied to the venture of the intake passage via, a delivery outlet located in a throat of the venturi; a fuel injector; fuel and air mixing means comprising a bypass flow chamber, connected to the bypass passage, surrounding a mixing chamber, the mixing chamber being enclosed within the bypass flow chamber and arranged such that the fuel can accumulate in and fill up the mixing chamber for subsequent entrainment; and a control unit operatively associated with the injector and the intake valve to deliver fuel from the fuel injector to the mixing chamber while the air intake valve is closed; wherein the bypass passage is connected to the fuel and air mixing means so that air or recirculated exhaust gas flowing through the bypass passage passes through the mixing chamber, entrains fuel present in the mixing chamber and a resulting mixture is delivered from the mixing chamber means to the intake passage via the delivery outlet.