Rotating speed detection circuit of gasoline engine

Abstract

The invention discloses a rotating speed detection circuit of a gasoline engine, which belongs to the field of engine control. The rotating speed detection circuit of the gasoline engine is characterized by comprising an engine shutdown wire pulse voltage division circuit, a signal filter circuit, a signal amplifying circuit and a shutdown circuit, wherein the engine shutdown wire pulse voltage division circuit is used for reducing voltage of a high-voltage pulse signal of an engine shutdown wire; the signal filter circuit is used for filtering the voltage-reduced signal; the signal amplifying circuit is used for amplifying the filtered signal into a signal (0 to 5V) which can be received by a rotating speed controller of the engine; and the shutdown circuit is used for receiving an outside high-level control signal to shut down the engine. The rotating speed detection circuit of the gasoline engine can convert the signal of the rotating speed in the shutdown wire of the gasoline engine into the level signal which can be received by the rotating speed controller of a common model engine such as Futaba GV-1, and does not affect the function of the engine shutdown wire.

Description

technical field [0001] The invention is a speed detection circuit for a gasoline engine, which can utilize the signal in the flameout line of a gasoline engine and convert it into a common model engine speed controller (such as Futaba GV) without using magnets and Hall elements. -1) The level signal can be detected, so as to realize the speed control of the engine conveniently. Mainly used in aerospace, robotics and other technical fields. Background technique [0002] A steady engine speed is critical to many jobs. Generally, a speed controller (such as Futaba GV-1) easily available on the market can be used to control the speed of the engine. This type of speed controller is designed for small methanol engines. Its principle is to use the Hall sensor to detect the rotation of a magnet installed on the engine shaft or fan blades, so as to obtain the engine speed data and control it to achieve the engine speed. control. In fact, in many occasions, especially gasoline-pow...

AI Technical Summary

Problems solved by technology

In fact, in many occasions, especially gasoline-powered unmanned helicopters, it is difficult to install magnets on the engine shaft or fan

In addition, the traditional magnet / Hall sensor detection method will loosen due to the strong vibration of the engine, which will cause serious consequences of Hall element detection failure in severe cases

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