| 摘要 |
<p>Device for the intelligent control of a venturi-type carburettor unit for a gaseous fuel, including a pressure regulator (11), a main throttle valve (5) in the airsuction pipe for control of the engine output and a regulating valve (17) in the gassupply pipe (13) between the pressure regulator (11) and the venturi (15), said 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 minor adjustments of the mixture are necessary to provide the engine with the correct mixture required for each load/speed condition. Said requirements are stored in a processor (40), 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 (31) is placed in the gaspipe (13), the gasflow sucking the diluting air through a mixing air regulating valve (35), which valve is controlled by the processor (40) in a continuous, analogues intelligent way. Optionally an O2-sensor (47) placed in the exhaust gases may send feed-backsignals to the processor for last corrections.</p> |
