Determining fuel vapor retention system regeneration valve control characteristic involves starting stepwise increase in pulse width at value greater than null, smaller than value corresponding to previously determined minimum pulse width

摘要

The control characteristic (17) describes the relationship between a pulse width modulated control signal and a valve setting (Q). The method involves determining the minimum pulse width (PWmin) necessary for opening the valve by increasing the pulse width (PW) in steps until a deviation of the current behavior of the engine is detected relative to its static behavior. The stepwise increase in the pulse width starts at a given value of the pulse width that is greater than null and smaller than a value corresponding to a previously determined minimum pulse width.