High-grade safety device based on double CPUs (Central Processing Unit) of pure electric vehicle

Abstract

The invention relates to a high-grade safety device based on double CPUs (Central Processing Unit) of a pure electric vehicle. The CPUs are the core of a vehicle control unit and comprise a master CPU and a slave CPU; the two CPUs are arranged on the same circuit board. The master CPU and the slave CPU collect and master control a key signal, are mutually communicated through an SPI (Serial Peripheral Interface), mutually detect whether abnormity occurs or not, and treat the normal condition in real time, so that the whole system can keep the normal work status. According to the high-grade safety device based on double CPUs of the pure electric vehicle, the safety and the reliability of the vehicle control unit are further improved, and the failure rate of parts of the pure electric vehicle is reduced. Two independent power chips are used to independently supply power to the master CPU and the slave CPU, and the slave CPU judges whether the master CPU meets the conditions of power up and down or not and sends power up and down commands, so that the power supply of the master CPU is not affected when a power supply of the slave CPU is abnormal. The failure and the function abnormity of the whole vehicle cannot be caused no matter which CPU has hardware or software fault.

Description

technical field [0001] The invention belongs to equipment in pure electric vehicles, in particular to safety devices in pure electric vehicles. Background technique [0002] A pure electric vehicle refers to a vehicle that is powered by a vehicle-mounted power supply, drives the wheels with a motor, and meets the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional cars, its prospects are widely optimistic, but the current technology is still immature. [0003] Under the dual pressure of depletion of oil resources and serious environmental pollution, the advantages of high energy saving and low pollution of pure electric vehicles have made them the main direction of contemporary automobile development. The three core electronic control technologies of pure electric vehicles: motor controller, battery management system and vehicle controller, undertake the comprehensive control of the entire pure electric vehicle,...

AI Technical Summary

Problems solved by technology

The disadvantage of this design scheme is that it cannot guarantee the accuracy of the energy management of the entire system and the coordinated control of each component. When the system data exchange volume is large, the core device CPU fails, and the entire system is paralyzed and unable to work. It is safe and reliable. The performance cannot meet the requirements, thus affecting the performance of the vehicle

[0007] There are also some designers who consider the risk of one CPU and use a dual-CPU architecture, but use a single power supply for the two CPUs. The disadvantage of this design scheme is that it only realizes the simple level of power supply for dual CPUs, and does not consider the relationship between the power supply and the chip. logical relationship between

Further research is needed on the in-depth logic of dual CPUs. The performance, safety and reliability of the entire control system cannot be guaranteed. The vehicle controller still needs to consider the power supply independently in terms of functional safety level.

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