Automatic speed adjusting device for small-size two-stroke gasoline engine

Abstract

The invention discloses an automatic speed adjusting device for a small-size two-stroke gasoline engine. The device comprises a carburetor (1), an adjustable-speed motor (3), a circuit controller (4), the engine (5), a flywheel and magnet motor (6) and an engine high pressure pack (7), the adjustable-speed motor (3) is fixed on the carburetor (1) through a mounting bracket (2), engine speed signals of the flywheel and magnet motor (6) which is installed on a crankshaft of the engine (5) are transmitted to the circuit controller (4), after making comparison with a set revolving speed, the circuit controller (4) outputs an adjustable-speed motor revolution signal, the adjustable-speed motor (3) is made to revolve forward or reversely, the accelerator opening of the carburetor (1) is driven by the adjustable-speed motor (3) to be opened or closed for a certain angle, the accelerator opening variation of the carburetor (1) controls the revolving speed of the engine (5), and the engine (5) is made to work at a constant speed under the set revolving speed. By means of the structure, the device has the advantages that the structure is simple and reasonable, the operation and use are convenient, the engine speed is adjusted automatically according to the set revolving speed, the operation is safe and reliable, and the device is capable of meeting emission requirements of the United States and the European Union.

Description

technical field [0001] The invention relates to a small two-stroke gasoline engine, in particular to an automatic speed control device for a small two-stroke gasoline engine that uses the power generated by the high-pressure package of the engine to automatically control the throttle opening of the carburetor to achieve automatic speed regulation. Background technique [0002] As a power device, a small two-stroke gasoline engine is widely used in lawn mowers, brush cutters, trimmers, tillers, scarifiers, planters, It has been widely used in gasoline saws and other equipment. However, due to the limitation of its own structure, the fuel utilization rate of the small two-stroke gasoline engine is low, and a considerable part of the oil gas is discharged without combustion or insufficient combustion, resulting in a considerable part of HC (hydrocarbons) in the exhaust gas. [0003] With the step-by-step improvement of emission regulations in the United States and the European...

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