Abstract
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.
Highlights
IntroductionA car, as a complex system of interacting elements, aggregates and mechanisms, provides its functioning due to the in-built reliability and overhaul ability, on the one hand, and improving the methods of technical impact on wheeled transport, on the other part
A car, as a complex system of interacting elements, aggregates and mechanisms, provides its functioning due to the in-built reliability and overhaul ability, on the one hand, and improving the methods of technical impact on wheeled transport, on the other part.Despite the high reliability, the technical condition of vehicle aggregates, systems, units, and parts changes in operation conditions, and failures occur from time to time.The large share of electric equipment failures is explained by permanently enhancing nomenclature of products, the increase of their technical complexity, and is coordinated with the data of other researchers
Malfunctions of motor starter traction relays cause the impossibility to perform reliable startup of internal combustion engines which can cause the risk of traffic accident occurrence if the worst comes to the worst
Summary
A car, as a complex system of interacting elements, aggregates and mechanisms, provides its functioning due to the in-built reliability and overhaul ability, on the one hand, and improving the methods of technical impact on wheeled transport, on the other part. A motor starter, serving for communicating the initial rotation frequency to an internal combustion engine, is a rather reliable device with the service life comparable to that or a car. In the composition of motor-and-tractor starters, the following components are usually distinguished: an electric motor serving for communicating the driving torque to the internal combustion engine (ICE) flywheel;. The main motor-and-tractor starter malfunctions are: breakages and short circuits of electric motor coils (13%), free-wheeling clutch slipping (10%), starter drive mechanism gumming (12%), wear of bushing and brush barrels (21%), failure of the cushioning spring (5%) and the in-built reducer (9%), damage of the gear teeth (7%), traction relay malfunction (18%) and others [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17]. The structure of malfunctions of automobile starter traction relays is given in Figure 1 [18]
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