Portable Petrol Tools

Abstract

The invention discloses a portable gasoline tool. The portable gasoline tool comprises a machine body, a flywheel arranged on the machine body, a carburetor arranged in the machine body and an air inlet channel which is formed in the carburetor and provided with an air inlet. The portable gasoline tool further comprises an electronic ignition mechanism, an automatic throttle control mechanism and a controller which controls the electronic ignition mechanism and the automatic throttle control mechanism, wherein the electronic ignition mechanism comprises an ignition coil and a spark plug in output connection with the ignition coil; the automatic throttle control mechanism comprises a rotating shaft and a choke valve mounted on the rotating shaft, and the choke valve opens or closes the air inlet. The portable gasoline tool is easy and convenient to operate and can be started even in a start-up stage at a low rotating speed, so that the overall efficiency of a system is improved; moreover, the ignition angle and energy can be controlled accurately, and when the load of a gasoline engine changes sharply, the ignition angle can be adjusted timely by sensing changes of the rotating speed detected by a sensor, so that the gasoline engine can work more stably, the use experience of a user is better, and popularization of the product is facilitated.

Description

technical field [0001] The invention relates to a portable gasoline tool. Background technique [0002] Portable gasoline tools are often used in the landscaping industry, and its electronic ignition system is one of the key systems. The electronic ignition system mainly includes a flywheel, an ignition coil, and a spark plug. The spark ignites the combustible mixed gas, causing it to explode and release energy, and the electronic ignition system emits sufficient ignition energy at the most suitable ignition angle, which can make the gasoline engine of the portable gasoline tool run smoothly and improve efficiency. The electronic ignition system commonly used at present includes a magneto, an igniter, an induction coil installed on the cylinder, and a permanent magnet installed on the flywheel. The permanent magnet rotates with the flywheel when each revolution meets the induction coil fixed on the cylinder. When the speed is high, an induced current will be generated in th...

AI Technical Summary

Problems solved by technology

However, the electronic ignition system has the following disadvantages: its voltage is directly proportional to the rotational speed. When the rotational speed is relatively low, the induced current generated is small, and the ignition energy is also relatively low. Among them, the relationship between ignition time, ignition energy and rotational speed is as follows: figure 1 shown

However, the existing common method for reducing the amount of inhaled air is to manually close the choke valve by the operator according to the temperature of the use environment, so as to reduce the amount of inhaled air. At the same time, the choke valve must be opened again when the gasoline engine is working normally. The manual operation of the whole process is quite cumbersome, and requires certain skills for the operator, which is not conducive to the popularization and promotion of the product.

Images