Arrangement for controlling the metering of fuel to an internal combustion engine

Claim 1

An arrangement for controlling fuel metered to an internal combustion engine, the arrangement comprising: first full-load limiting means for generating a limit signal (QK4) to limit the quantity of fuel metered to the engine during full-load operation in dependence upon at least the rotational speed of the engine and only during predetermined operating conditions thereof; substitute full-load limiting means for generating a limit signal (QK3) to limit the quantity of fuel metered to the engine during idle and the values of said limit signal (QK3) being dependent solely upon the operating temperature of the engine and the temperature of the fuel thereby preventing the engine from stalling when cold; idle-speed controller means for generating an output signal (QK1); minimum selector means for receiving said output signal (QK1) and said limit signal (QK3) for generating an output signal (QK5) in dependence upon said signals (QK1 and QK3); driving characteristic field means for generating an output signal (QK2); summing means for combining said output signal (QK5) and said output signal (QK2) to generate signal (QKN); means for comparing said signal (QKN) to said limit signal (QK3) and permitting said limit signal (QK4) to be generated only when said signal QKN is equal to or greater than said signal (QK3); and, means for applying said substitute full-load limiting means for limiting the quantity of fuel when the engine is in an operating condition for which the fuel to be metered to the engine is above the lower limit (Q K3MIN ) of the substitute full-load limit and below the upper limit (Q K3MAX )of the substitute full-load limit.