FIELD: automotive industry.
SUBSTANCE: invention can be used in internal combustion engines with end gas recycling (EGR) systems. Method for engine (10) consists in the fact that EGR valve (121), (210), is installed downstream of EGR cooler (113), (212), to the open position and a first pressure reading from the sensor downstream of the EGR valve and the first differential pressure reading on the EGR valve from differential pressure sensor (125), (216) on the EGR valve are obtained. First pressure reading and the first differential pressure reading are taken off the EGR flow. Set EGR valve (121), (210) to the closed position and obtain a second pressure reading from the sensor downstream of the EGR valve and a second differential pressure reading on the EGR valve from differential pressure sensor (125), (216). Second pressure reading and the second pressure drop reading are taken without the EGR flow. Downstream pressure of EGR cooler (113), (212) is determined based on a comparison between the second differential pressure reading on EGR valve (121), (210) and the second pressure reading downstream of EGR valve. Downstream pressure of EGR cooler (113), (212) is determined based on a comparison between the first differential pressure measurement on EGR valve (121), (210) and the first indication of the downstream pressure from EGR valve. Pressure drop across EGR cooler (113), (212) is determined based on a comparison between the upstream and downstream EGR cooler pressures. Degradation of the characteristics of EGR cooler (113), (212) is determined based on the differential pressure on EGR cooler. Engine does not include a differential pressure sensor for EGR cooler (113), (212). Variant of the method for the engine is disclosed.
EFFECT: reduced size of the EGR cooler.
11 cl, 7 dwg
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