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The mini automobile becomes to one of the fastest develop types in the Chinese automobile in recent years, for the reason of its small output volume and low price. The engine takes as the power heart of the mini automobile, the quality of its running status direct affects the powerful and economical performance of mini automobile. Therefore, the engine is needed to carry on the repeated test before leaving the factory, examine and confirm its performance, guarantee that the engine is safe、stable and reliable in the process of working. In process of the bench test, it inevitably will have some accidents, like the connecting rod has the break for its insufficient rigidity, and so on, these accidents not only will create the harm to the engine itself, also will create the serious damage to the test bench, what will be more serious is to pose the serious threaten on the personal safety of the experiment person, therefore, it needs to research a monitoring system, which will carry on the real-time monitor for the conditioning of the test engine, and the warning will occur before the accident happen, as a result, it will have the effect of preventing accident and the protecting experiment person. This article mainly research on the following four parts:(1) The engine bench test of mini automobile is introduced, and through the analysis of this paper’s research background and domestic and foreign present situations, this article’s research content, goal and significance is proposed.(2) The research on monitoring method of the engine bench test process is introduced. The main pattern of manifestation when the engine main movement vice and the gear box have faults is the vibration characteristics change, through analyzing the mechanics mechanism which the engine main movement vice and the gear box vibration produces, the feasibility that using the vibration signal carry on the engine test process monitoring is proposed.(3) The overall hardware design of the signal acquisition system and the design of the early warning system are introduced. Through the analysis of data acquisition’s basic principle, based on the DSP technology, the hardware system of data acquisition system is designed, besides, the function of the early warning system the circuit diagram is proposed.(4) The realization of software function, based on virtual instrument, is introduced. First, the virtual instrument technology and the LabVIEW software development platform is introduced, then the hierarchical structure of software system of engine test process monitoring system is proposed, and each submodule’s design and function realized is introduced in detail, finally, the system function is validated.
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