Shutdown and fuel-cutoff control device and method of single-cylinder carburetor type engine

Abstract

The invention relates to a shutdown and fuel-cutoff control device and method of a single-cylinder carburetor type engine. The device comprises an air supplementing assembly, a fuel-cutoff switch (1), an idling contact switch (2), an engine rotating speed sensor (6), a driving wheel speed sensor (7), a gear switch (8) and a control unit (3), wherein the air supplementing assembly comprises an air supplementing solenoid valve (5); the control unit (3) is correspondingly connected to the air supplementing solenoid valve (5), the fuel-cutoff switch (1), the idling contact switch (2), the engine rotating speed sensor (6), the driving wheel speed sensor (7) and the gear switch (8) through a first signal wire, a second signal wire, a third signal wire, a fourth signal wire, a fifth signal wire and a sixth signal wire. Compared with the prior art, the device has the beneficial effects that the mounting is convenient; the energy conservation and the safety are ensured; that fuel in a float chamber of the carburetor is injected into a throat-shaped port under the high vacuum degree in case of engine idling or shutdown can be effectively prevented, so that the fuel consumption can be greatly saved.

Description

technical field [0001] The invention relates to an engine flameout and fuel cutoff control device and a control method thereof, in particular to a single-cylinder carburetor type engine flameout and fuel cutoff control device and a control method thereof. Background technique [0002] Usually, when the throttle valve of the carburetor engine is suddenly closed (turn off or forced idle), the air pressure at the throat of the carburetor and the idle nozzle will decrease due to the increase of vacuum in the intake manifold, resulting in The fuel in the float chamber of the carburetor is ejected from the idle nozzle and the main nozzle and enters the cylinder under the action of vacuum. Obviously, this part of the extremely dense fuel cannot be completely burned, resulting in waste of fuel. Therefore urgently need to improve. [0003] The Chinese invention patent with the patent number ZL200710075108.7 discloses a new complete set of electronically controlled air supply system ...

AI Technical Summary

Problems solved by technology

But the electronic controller described in this invention is not provided with the control device to flameout switch, idle contact switch, engine speed, drive wheel speed and gear switch, can't realize carburetor type engine when engine throttle suddenly closes. Control the engine to shut off the fuel, so there are still the following technical defects: At this time, due to the instantaneous increase of the vacuum degree of the intake manifold, the pressure of the airflow at the throat of the carburetor and the idle nozzle is reduced, resulting in the float chamber of the carburetor The fuel is ejected from the idle nozzle and the main nozzle and enters the cylinder under the action of vacuum, and this part of the extremely dense fuel cannot be completely burned, resulting in waste of fuel

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