At present, most large machinery and vehicle engines are electronically controlled but their electronic control systems are too expensive to be popularised and applied in small gasoline engines with relatively low prices. Therefore, small gasoline engines still use mechanical speed regulators. Mechanical speed regulators not only have the defects of inertia lag, friction resistance, inherent speed regulation and the like, but also have the disadvantage that dynamic performance and steady performance cannot be combined, which is not suitable for the increasingly improved speed regulation performance of gasoline engines. This paper describes the design of an electronically controlled intelligent governor for small gasoline engines. Starting from a low cost, it adopts the idea of "replacing part of the hardware with an intelligent sensing algorithm" and proposes an intelligent sensing algorithm scheme. It combines the "coarse tuning" of MAP and the "fine tuning" of adaptive expert PID. The system is proved experimentally and it not only overcomes the inherent defects of a mechanical governor and realises programmable speed regulation, but it also obtains good dynamic and steady performance, improves the power output of the engine, relieves the trouble of engine travelling and improves the freedom of carburetor matching.

Among the shortcomings of the existing pipette cartoning technology, first, it needs a lot of manpower and time to complete by hand; second, it is based on a semi-automatic equipment for loading the suction heads, which cannot ensure that the suction head is upright (bottom tip down) or avoid the phenomenon of suction head overlapping. Based on this, an automatic system for packing pipette suction heads is proposed. Firstly, the research status of pipette cartoning is analyzed; secondly, the mechanical design of the automatic cartoning system for pipette suction heads is given; thirdly, the hardware structure diagram and software flow of the automatic cartoning system are given. Finally, the system is applied to a pipette suction head box in a school laboratory. After many times of practice, it is proved that the system can realize the automatic pipette suction head box, and has the advantages of stable performance, accurate positioning and intuitive display, which improves the efficiency of the pipette suction head box in the laboratory.

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