Procedure for adjusting an opening time calculation model or estimate table and an injection control system of a cylinder in an internal combustion engine

摘要

A method for adjusting an on-time calculation model or lookup table used for determining on-time values for an injector (11) of a cylinder in a combustion engine of a motor vehicle where the injector is connected to a fuel accumulator (12). The method comprises the steps of: - injecting a test fuel quantity exceeding the maximum allowed fuel injection quantity, under such conditions that no ignition of the injected fuel takes place; - measuring the pressure drop in the fuel accumulator during the test injection; - establishing the actual fuel quantity injected during said test injection based on said pressure drop; - performing a comparison based on said actual fuel quantity or the corresponding on-time value established with the aid of said on-time calculation model or lookup table; and - adjusting said on-time calculation model or lookup table in dependence on the result of said comparison.