Robert Boschgmbh

Alfred Grassle

Thomas Wilfert

Heinrich Knapp

Klaus-Jurgen Peters

Hans Schnurle

Paul Fussner

A fuel injection apparatus for mixture-compressing, externally ignited internal combustion engines. An air flow rate member, arranged in the air intake manifold is moved against a return force by air flowing through it to adjust a control slide of a metering and distribution assembly arranged in the fuel supply line in order to effect the apportionment of a quantity of fuel which is proportional to the air quantity. The return force is produced by a pressure fluid acting upon the control slide, the pressure of the fluid being variable in accordance with operating characteristics of the internal combustion engine. The control slide has an actuation slide contacting the air flow rate member as well as an apportionment slide, which has a projection with a smaller diameter projecting into an axial throttle bore of the actuation slide and defining a damping space in the throttle bore. The damping space is in communication with the fuel supply line via a gap between the projection and the throttle bore, and there is a bimetallic spring arranged between the apportionment slide and the actuation slide. By this means a richer fuel-air mixture is controlled at the metering and distribution assembly in accordance with the starting temperature, during starting of the engine below a predetermined temperature; the enrichment is lessened after the start in accordance with both temperature and time.

Fuel injection apparatus

A control circuit for a fuel-injected internal combustion engine provides a substitute program for generation of fuel injection control pulses during engine starts at low temperatures. The substitute injection control pulses are made dependent on the ambient or engine temperature in the sense that, the lower the temperature, the greater is the length of the injection pulses, i.e., the larger is the quantity of initially injected fuel. The length of the injection pulses also depends on the elapsed duration of the engine starting attempt in the sense of gradually reducing the injected fuel quantity as the unsuccessful engine cranking proceeds. A fully opened throttle during engine cranking signals a flooded engine condition and completely interrupts fuel injection.

Method and apparatus for cold starting fuel injected internal combustion

A fuel injection system for continuous injection to an internal combustion engine has a pivoting air sensor plate with a correction lever that engages a fuel control plunger for metering out fuel in proportion to the air flow. The system also includes a bimetallic, temperature-dependent strip which exerts an opening force on the correction lever when the engine is cold. An electric heater is energized by the starter switch and begins to reduce the force due to the bimetallic strip even before the engine has actually warmed up. A second electric heater of reduced power maintains the strip in disengagement during normal engine operation.

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Ludwigsburg, Germany

Alfred Grassle