F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/49
F02M 17/00 (2006.01) F02M 51/06 (2006.01) F02M 55/00 (2006.01) F02M 61/14 (2006.01) F02M 69/04 (2006.01) F02B 1/04 (2006.01) F02M 51/08 (2006.01)
Patent
CA 1102190
Abstract of the Disclosure A low pressure throttle body injection apparatus for a spark ignition internal combustion engine includes an injector mechanism mounted above a throttle body having at least one throttle bore with a throttle controlling flow therethrough. A valve controlled fuel injector is supported in a socket in the injector mechanism with its spray tip end positioned to inject fuel toward the throttle bore wall upstream of the throttle. An annular fuel well is defined by an internal socket wall and the exterior of the fuel injector, that is in communication with the valve end interior of the fuel injector via injector side ports. The injector mechanism defines a fuel inlet passage, including a fuel reservoir, opening into the fuel well and connectable to a source of low pressure fuel and a fuel return passage opening from the fuel well and connectable to the engine fuel supply tank. A pressure regulator connected in the fuel return passage is used to regulate the pressure of fuel in the fuel well. The injector mechanism further defines vapor flow passages for the flow of any fuel vapor from the fuel-inlet passage to the fuel return passage. The amount of fuel entering the injector mechanism is substantially greater than the fuel discharge into the throttle bore by an amount sufficient to effect cooling of the injector mechanism so as to avoid substantial fuel vapor- ization at the fuel injector.
316341
General Motors Corporation
Gowling Lafleur Henderson Llp
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