FIELD: machine building.
SUBSTANCE: invention can be used in exhaust gas cleaning systems for internal combustion engines. Method for exhaust system of the engine. Under the chosen conditions, the output signal of the upstream sensor of oxygen content in exhaust gases and downstream sensor of oxygen content in exhaust gases are matched to the pressure drop in the particulate filter. Said particulate filter is installed in the exhaust system. Under selected conditions, the oxygen concentration in the exhaust gas on the particulate filter is essentially constant. Selected conditions: the load on the diesel particulate filter is less than the threshold value, the exhaust gas flow is above the threshold value and the engine is operating in steady state. Further, the output signal is the output voltage. In the method, the matching process involves the following steps. Averaging the output voltage of the upstream and downstream sensors for a given interval. Adjusting the average output voltage of the upstream sensor, depending on the estimated pressure data of a serviceable gasoline particulate filter, which depend on the exhaust gas flow. Estimating the pressure drop across the filter depending on the ratio of the matched average output voltage of the upstream sensor to the downstream sensor output voltage. Indicating the deterioration of the performance of the particulate filter on the basis of the pressure drop data. Disclosed is a method for engine exhaust system and engine exhaust system.
EFFECT: improved accuracy and reliability of indicating the quality of the performance of a particulate filter.
16 cl, 12 dwg
