Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1978-07-06
1982-07-27
Lall, P. S.
Internal-combustion engines
Charge forming device
Fuel injection system
123446, 123516, 123541, 261 65, F02M 3900
Patent
active
043411932
ABSTRACT:
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 vaporization at the fuel injector.
REFERENCES:
patent: 3510112 (1970-05-01), Winquist et al.
patent: 3545948 (1970-12-01), Baverstock
patent: 3616782 (1971-11-01), Matsui et al.
patent: 3635201 (1972-01-01), High
patent: 3789819 (1974-02-01), Moulds
patent: 3877449 (1975-04-01), High
patent: 3943904 (1976-03-01), Byrne
patent: 3996906 (1976-12-01), Bubniak et al.
patent: 4066721 (1978-01-01), Graham
patent: 4104992 (1978-08-01), Fricker
General Motors Corporation
Krein A. N.
Lall P. S.
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