Hardware implementation of the diagnostic system of a car electric drive

Abstract

Operational monitoring of vehicle diagnostic parameters allows you to timely establish the fact of a malfunction, localize the location of damage and affect the drive system to avoid an emergency situation. The purpose of research at this stage is the selection of traction electronic devices and the synthesis of the design of an information-measuring complex for monitoring the diagnostic parameters of a car traction electric drive system. The hardware implementation of the measuring complex, in general, involves the solution of several problems: the choice of the type of current sensor; integration of the sensor into the battery; building a spectrum analyzer structure; selection of digital signal processing system configuration; constructive and electrical binding of the complex to the object of diagnosis. As a diagnostic parameter to assess the technical condition of the traction electric drive, the spectral composition of the periodic function of the battery current is considered. To measure the current at the stage of a physical experiment in the power supply circuit, it is necessary to determine the type of the non-contact current sensor. For technological reasons, annular sensor designs are appropriate to use in integrated measuring channels, the clamped ones - in external connection systems. In the first case, the requirements for the design and technical characteristics, an analog current sensor type CSLA2DG ring design was selected. In the second case, universal current meters of industrial designs with analog, digital or radio frequency output can be used. For linking the current sensor to the power supply circuit of the traction electric drive, the proposed designs of the technological jumper of the battery are proposed. The choice of the type of spectrum analyzer is determined by the method of its application (development stage, system configuration). At the stage of building the knowledge base of an expert system, several options (hardware, software, hardware and software) of low-frequency spectrum analyzers for various purposes, such as equalizers, sound level meters, vibration analyzers, were considered. Based on the selected devices of the measuring channel, two configurations of the diagnostic system were synthesized – integrated into the traction electric drive and external connection. Several options of connection (models) of current meters with an expert system, which is implemented in the environment of universal computer facilities, are determined.Keywords: electric drive; Hall sensor; high-voltage battery; spectrum analyzer; diagnostic system.