Failure detection method for air conditioning system

A fault detection method for an air conditioning system, wherein the air conditioning system has an injector and a liquid pump for providing pressure compensation;

• the fault detection method comprising:
• S100, learning to obtain a monotonically decreasing fault detection characteristic curve Y=K(X−Xmax)+A by using an electrical power consumption of the liquid pump and a high-pressure-side pressure of the injector;
• where Y is the electrical power consumption of the liquid pump, X is the high-pressure-side pressure of the injector, K is a slope of the fault detection characteristic curve obtained by learning, A is a set fault tolerance value, which is not less than 0, and Xmax corresponds to a maximum high-pressure-side pressure of the injector;
• and
• S200, when the current pressure of the injector Xcurrent≤Xmax:
• if the current electrical power consumption Ycurrent<K(Xcurrent−Xmax)+A, then a probability of the injector state of the air conditioning system being normal is greater than a first preset value;
• and if the current electrical power consumption Ycurrent>K(Xcurrent−Xmax)+A, a probability of the injector of the air conditioning system having a fault is greater than a second preset value.