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A monitoring method and watchdog module for a vehicle body control system

A body control and watchdog technology, applied to the generation of response errors, etc., can solve the problems of abnormal state machine, unable to switch states, and no way to detect abnormal function areas, etc., to eliminate suspended animation, avoid invalid actions, and avoid failures Effect

Active Publication Date: 2017-11-14
HELLA SHANGHAI ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A monitoring method and watchdog module for a vehicle body control system
  • A monitoring method and watchdog module for a vehicle body control system
  • A monitoring method and watchdog module for a vehicle body control system

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Embodiment Construction

[0029] The features of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] First, see figure 1 , is a schematic diagram of the present invention. The present invention consists of two modules, a vehicle body control system 100 and a watchdog module 200. The system 100 includes at least two state machine modules (not shown), and the watchdog module 200 includes watchdog logic. The watchdog module 200 is configured to count when it does not receive the dog feeding signal from the state machine module, and send an abnormal signal to the body control system 100 when the count value exceeds a preset threshold, and the body control system 100 then according to The abnormal signal resets the state machine module; when the watchdog module 200 receives the feeding signal, the count value will be cleared, and the watchdog module is reset.

[0031] In order to further explain the working principle of the...

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Abstract

The present invention relates to a monitoring method of a vehicle body control system and a watchdog module, wherein the watchdog module judges whether a dog feeding signal from the state machine module is received; if not, the watchdog module starts Counting, when the count value exceeds a preset threshold, an abnormal signal is sent to the body control system, and the body control system resets the state machine module according to the abnormal signal; if so, clears the count value and resets the Watchdog module.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/07
Inventor 毛文龙
Owner HELLA SHANGHAI ELECTRONICS
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