EGR differential pressure sensor icing diagnosis processing method

The invention relates to the technical field of automobile engine electronic control, in particular to an EGR differential pressure sensor icing diagnosis processing method which comprises the following steps that firstly, a diagnosis mode is entered, and the diagnosis mode comprises the steps that the cooling liquid temperature T1 and the environment temperature T2 are obtained; whether the cooling liquid temperature T1 is smaller than or equal to T01 or the environment temperature T2 is smaller than or equal to T02 or not is judged, the T01 is a first temperature threshold value, and the T02 is a second temperature threshold value; if the cooling liquid temperature T1 is smaller than or equal to T01, or the environment temperature T2 is smaller than or equal to T02, the physical value delta P of the EGR differential pressure sensor is obtained; whether the physical value delta P of the EGR differential pressure sensor meets the condition that delta P is larger than delta P01 or not is judged, wherein delta