A method of operating an internal combustion emgine

摘要

The method comprises the steps of measuring (605, figure 4) an air-to-fuel (a/f) ratio in the engine exhaust gas; es­timating 600 a value (Texh) of the exhaust gas temperature on the basis of the meas­ured value (a/f) of the air-to-fuel ratio; calculating 700 an error between the estimated value (Texh) of the exhaust gas temperature and a target value (Ttar) thereof; adjusting 800 a parameter (ET, FQ) affecting an injected fuel quantity on the basis of the calculated error. An electronic control unit (ECU), in an automotive system, is also configured to perform the above method. These methods can also improve the accuracy of the estimation by including other engine operating parameters such as engine coolant temperature, or manifold pressure, and applying these dedicated factors toe the final temperature estimate (as seen in figure 4). This method allows for a strategy for keeping the temperature of the exhaust gases under control, helping to prevent the exhaust manifold and/or turbine failures while also increasing engine performance. This also allows for a system with fewer sensors as only a lambda sensor can be used instead of a lambda and temperature sensor.