| Summary: | Malfunction of motor starter traction relays cause the impossibility of the reliable start of internal combustion engines which, if the worst comes to the worst, can create the risk of traffic accident occurrence. Electric resistances of traction relay coils are structural and diagnostic parameters at the same time. Emergence and development of failures causes the change of magnetomotive force generated by the traction relay coils. Critical values of electric resistances correspond to failures of traction relay coils, i.e., inability to perform the built-in functions. The developed mathematical model of traction relay normal operation includes the amount of effort generated and voltage loss on contacts as controlled values for the drive mechanism and the starter electric motor, respectively. The results obtained contribute to the development of the method of motor-and-tractor starter diagnostics without removing it from the engine.
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