Method and device for controlling the operation of an exhaust gas recirculation valve recycling exhaust gases into the gas intake of a motor vehicle engine

摘要

This device, in which the valve (5) is connected between the outlet (2) for the exhaust gases and the intake (3) for fresh gases into the engine, via a gas recirculation pipe (4) and is driven, in terms of opening and in terms of closing by a control computer (6), is characterised in that it includes means (7, 8) for measuring the pressure head at which gas is taken into the engine (1) upstream and downstream of the outlet of the recirculation pipe (4) before and after the valve has been driven in terms of opening or in terms of closing, means (6) for comparing the pressure head measurements upstream of the outlet from the recirculation pipe (4) before and after the valve (5) has been driven in order to determine an unstable operating condition for the engine (1) and not to validate control in the event of a difference between the measurements, and means for comparison (6) in the event of equality between the pressure head measurements upstream of the outlet of the pipe, pressure head measurements downstream of the recirculation pipe outlet (4) before and after the valve is driven, in order to determine correct operation of the valve in the event of differences between these measurements, and an operational defect in this valve in the event of these measurements being equal. IMAGE