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Protecting control box is an important part of the self-protection module of certain special vehicle. In the process of usage, it is difficult to find and test when the protecting control box breaks down. And when the operator makes misoperation, the vehicle can’t come to self-protection and will occur catastrophe failures which will influence equipment using life. An intelligent detecting system based on PLC is promoted in this paper. It can achieve intelligent detecting for protecting control box and will improve work efficiency and reduce the risk of maintenance and misoperation. Introduction In the process of vehicle usage, when the operator makes misoperation, the special vehicle couldn’t come to self-protection which will make structural component damage and influence equipment using life, because of the absence of detecting device for protecting control box. To improve the vehicle detecting efficiency and prevent catastrophe failures, an intelligent detecting system for protecting control box is badly needed. Basic Principle of Protecting control box The protecting control box is a device for certain special vehicle to prevent unnecessary damage by its protecting control mechanism. It has two main protecting functions: one is to ensure the effective protection of the tri-proof device by shutting down the aerator and ventilating device. Another one is to judge whether the 40kw electric generator is allowed to be engaged and prevent engagement to protect vehicle’s safety when not allowed. Fig.1 Construction drawing of protecting control box The 1-th pin: this pin connects DC +24V input, while the 7-th pin is the negative of power source which is grounded. The functions of the pins are as follows: The 2-th pin: this pin is connected to the 7-th pin of voltage regulator Plug and transport the signal of engine speed. When this pin is power supplied, the engine works and the 40kW electric generator can’t be engaged. The 3-th pin: this pin stands for the allowing turning on the 40kW electric generator. The protecting control box makes the latch-up control of 40kW jointing switch and judge the next action. The 4-th pin: the 40kW electric generator engagement controls the magnetic valve acting. When the 40kW electric generator is allowed engaging, this pin gives a signal to engage the 40kW electric © 2016. The authors Published by Atlantis Press 574 6th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2016)

Design of Intelligent Detecting System Based on PLC for Protecting Control Box of Certain Special Vehicle