Abstract: An engine includes at least one spark plug, an ignition advance management device to determine and to apply an optimum ignition advance of the spark plug, and an exhaust gas recirculation device equipped with a gas recirculation control valve. A control device for the internal combustion engine includes a first actuator to force opening and closing of the control valve, a map in which are stored theoretical ignition advance values as a function of engine speed and engine load, a first calculator to calculate a diagnostic criterion as a function of the theoretical ignition advance determined from the map and the optimum ignition advance, and a comparator to compare the diagnostic criterion to a control valve failure threshold.

Abstract: An engine includes at least one spark plug, an ignition advance management device to determine and to apply an optimum ignition advance of the spark plug, and an exhaust gas recirculation device equipped with a gas recirculation control valve. A control device for the internal combustion engine includes a first actuator to force opening and closing of the control valve, a map in which are stored theoretical ignition advance values as a function of engine speed and engine load, a first calculator to calculate a diagnostic criterion as a function of the theoretical ignition advance determined from the map and the optimum ignition advance, and a comparator to compare the diagnostic criterion to a control valve failure threshold.

Abstract: A diagnostics method for a supercharged internal combustion engine including a fixed-geometry turbocharger, including a compressor through which air admitted into an intake circuit passes, and a turbine rotationally connected to the compressor and through which exhaust gases pass, the method including: calculating a first integral with respect to time of a measurement of atmospheric pressure; calculating an integral with respect to time of a measurement of boost pressure; calculating a second integral with respect to time of a measurement of atmospheric pressure; calculating two diagnostics criteria dependent on the first integral of atmospheric pressure, on the integral of the boost pressure and on the second integral of the atmospheric pressure; comparing the first diagnostics criterion with a first diagnostics threshold and comparing the second diagnostics criterion with a second diagnostics threshold; and diagnosing a fault when at least one of the diagnostics criteria is below its associated diagnostics

Abstract: A diagnostics method for a supercharged internal combustion engine including a fixed-geometry turbocharger, including a compressor through which air admitted into an intake circuit passes, and a turbine rotationally connected to the compressor and through which exhaust gases pass, the method including: calculating a first integral with respect to time of a measurement of atmospheric pressure; calculating an integral with respect to time of a measurement of boost pressure; calculating a second integral with respect to time of a measurement of atmospheric pressure; calculating two diagnostics criteria dependent on the first integral of atmospheric pressure, on the integral of the boost pressure and on the second integral of the atmospheric pressure; comparing the first diagnostics criterion with a first diagnostics threshold and comparing the second diagnostics criterion with a second diagnostics threshold; and diagnosing a fault when at least one of the diagnostics criteria is below its associated diagnostics