Electric power steering safety monitoring system
The invention discloses an electric power steering safety monitoring system, which is characterized in that a main control chip and an auxiliary control chip of the safety monitoring system are connected through an SPI communication system, and the auxiliary control chip is connected with an SPI chi...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The invention discloses an electric power steering safety monitoring system, which is characterized in that a main control chip and an auxiliary control chip of the safety monitoring system are connected through an SPI communication system, and the auxiliary control chip is connected with an SPI chip selection signal line through an edge capture pin, captures a rising edge or a falling edge of an SPI chip selection signal, and calculates the pull-down time width of the corresponding SPI chip selection signal; the calculated pull-down time width of the SPI chip selection signal is compared with a normal value thereof so as to diagnose whether the system frequency of the main control chip is normal or not; and a main relay and a digital communication driver are turned off respectively when the system frequency is abnormal. According to the invention, the operating state of the system frequency can be diagnosed on the basis of not increasing output pins of the main control chip and occupying a low load rate of the auxiliary control chip, thus safety protection operations are carried out on an EPS (electric power steering) system, and risks brought about by abnormity in system frequency of the main control chip for the safety of a complete vehicle are eliminated. |
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