Monitoring method and watchdog module for car body control system

Abstract

The invention relates to a monitoring method and a watchdog module for a car body control system. The monitoring method for the car body control system includes that the watchdog module judges whether a dog feeding signal from a state machine module is received; if not, the watchdog module begins to count, when the count value is higher than a preset threshold, the watchdog module sends an abnormality signal to the car body control system, and the car body control system resets the state machine module according to the abnormality signal; if so, the count value is reset, and the watchdog module is reset.

Description

technical field [0001] The invention relates to a monitoring method and a watchdog module used in a vehicle body control system to prevent the system from being in an abnormal working state. Background technique [0002] In the design of electronic products, when the system runs abnormally, the system may be in a stagnant state without any response to external input and trigger. At this time, it is necessary to introduce a watchdog technology, which can monitor whether the watchdog module in real time in normal operating condition. The basic technical principle of the watchdog is that when the system is in a normal state, the system must periodically traverse a certain process, and send a signal to the watchdog module during this process. If the watchdog module does not receive the signal for a certain number of cycles When the signal is received, the watchdog module will think that the system is abnormal. At this time, the watchdog module will send a system abnormal signal...

AI Technical Summary

Problems solved by technology

[0004] In some complex systems, if there is a state machine in its software design, the external watchdog circuit cannot monitor the working state of the state machine, then the following situation may occur, the state machine is abnormal and cannot switch states, but the monitoring The watchdog circuit of the whole system can normally receive the dog feeding signal, because the state machine is only a functional area in the system. Although the system can traverse the functional area, it has no way to detect the abnormality inside the functional area.

In this way, the system will be in a state of suspended animation, and the main function will fail, but it cannot be recovered by the traditional hardware watchdog

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