VORRICHTUNG ZUR ZUFUEHRUNG VON GAS ALS ZWEITBRENNSTOFF FUER DIESELMOTOREN

A system for use of gas, like LPG, as secondary fuel in diesel engines is concerned. Normally aspirated and pressure charged engines with exhaust gas driven charging, with End-speed or All-speed governors or with common-rail-fuel injection systems are all included. A signal (24,25) proportional to the momentary effective fuel consumption controls the gas supply (20) to the engine (1). A valve (19) in the gas supply (18) is connected to the control lever (16) of the engine governor (12) to allow gas supply only in a load range above approximately 25% and up to a maximum of approximately 40% of the full load total fuel consumption. In the lower load range uncomplete combustion of the gas thus is avoided, in the higher load range both detonation and overload are avoided and the opacity of the exhaust is improved. The consumption of liquid fuel is reduced and the exhaust gas composition is improved. An adjustable stop (28,29) limits the maximum injectable liquid fuel quantity when the engine is operated in the dual-fuel-mode. The system is designed to be both retrofittable to existing engines and fittable to factory new engines.