Internal-combustion engines – Charge forming device – Gaseous fuel and air mixer
Patent
1989-06-12
1990-09-04
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Gaseous fuel and air mixer
123442, F02M 2102
Patent
active
049535161
ABSTRACT:
Device for the intelligent control of a venturi-type carburettor unit for a gaseous fuel, including a pressure regulator, a main throttle valve in the airsuction pipe for control of the engine output and a regulating valve in the gas supply pipe between the pressure regulator and the venturi, this valve being coupled to the main throttle valve. By adjusting this mechanical system for providing a too rich air-fuel-mixture under all conditions, only mirror adjustments of the mixture are necessary to provide the engine with the correct mixture required for each load/speed condition. These requirements are stored in a processor, and the latter controls the necessary corrections of the mixture by diluting the gasflow to the main venturi with some air. To this end a small venturi is placed in the gaspipe, the gasflow sucking the diluting air through a mixing air regulating valve, which valve is controlled by the processor in a continuous, analogic intelligent way. Optionally an O.sub.2 -sensor placed in the exhaust gases may send feed-back signals to the processor.
REFERENCES:
patent: 4489700 (1984-12-01), van der Weide
patent: 4513728 (1985-04-01), Ullman et al.
patent: 4541397 (1985-09-01), Young
patent: 4545356 (1985-10-01), Casey
patent: 4617904 (1986-10-01), Pagdin
Hoogeboom Adrianus J. T.
van der Weide Jouke
Cross E. Rollins
Necam B.V.
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