Method and device for controlling idle speed of vehicle carrying electrically controlled throttle valve

Abstract

The invention relates to a method and a device for controlling the idle speed of a vehicle carrying an electrically controlled throttle valve, which are applicable to an idle speed control device respectively provided with the electrically controlled throttle valve and an electrically controlled idle speed bypass-valve. The idle speed control method includes an idle speed judgment step, a main adjustment step, a detection step, a throttle valve judgment step, an auxiliary adjustment step and an end step. The invention utilizes the idle speed control device provided with the electrically controlled idle speed bypass-valve and the electrically controlled throttle valve to control the rotating speed of an engine in an idling process, and a control mode adopting the electrically controlled idle speed bypass-valve as a main part and the electrically controlled throttle valve as an auxiliary part is used for adjusting the integral air input of the engine in the idling process, so that the rotating speed of the engine can be controlled within the preset target range value of the idle speed and the rotating speed. The invention has the advantages of accurate control of idle speed and rotating speed, stable system voltage, prolonged service life of drive IC, etc.

Description

technical field [0001] The present invention relates to an idle speed control method, in particular to an idle speed control method and a device thereof for a vehicle equipped with an electronically controlled throttle valve. Background technique [0002] Generally, the idle speed control method of vehicles (cars) equipped with an electronically controlled throttle valve is: the difference between the actual engine speed detected by the crankshaft position sensor and the target idle speed engine speed is used to determine the opening degree of the electronically controlled throttle valve. Increase or decrease to adjust the intake air volume, so as to keep the idle engine speed stable and meet the target value. [0003] For automobiles, due to the large displacement of the automobile engine and the large inertial mass of its flywheel, the slight change in air intake caused by the throttle valve will not affect the idle state (that is, the driver does not step on the accelerat...

AI Technical Summary

Problems solved by technology

[0004] However, currently on the market for two-wheeled motorcycles (Bike, Scooter) and multi-purpose vehicles (ATV, UV), etc., there is no design equipped with an electronically controlled throttle valve.

[0005] As far as the application of the electronically controlled throttle valve is concerned, since the exhaust volume of the above-mentioned models is not as good as that of ordinary cars, and the inertia of the flywheel is also small, if it is necessary to use the electronically controlled throttle valve to control two-wheeled motorcycles or multi-function When the speed of the engine of the type vehicle is high, it is very likely that when the opening of the electronically controlled throttle valve changes slightly, the engine speed has a large change compared with the change in the intake air volume caused by the throat diameter of the throttle valve. Variations and cause engine speed instability during idling

[0006] In addition, there is also a design for using an electronically controlled idle bypass valve to control the engine speed at idle on general two-wheeled motorcycles and multifunctional vehicles. The overall air flow is small, that is to say, the range of engine speed control is relatively small, so it is easy to cause the vehicle to idle when the electronically controlled idle bypass valve reaches the maximum or minimum airflow throughput. , it is still impossible to effectively adjust the engine speed to the target range of the preset idle speed value, resulting in the inability to effectively control the engine speed of the vehicle at idle

[0007] For general two-wheel motorcycles and multi-purpose vehicles, the engine is usually maintained at a preset speed (about 1200rpm) during idling. If the speed is lower than the preset speed, the engine will stall and cause traffic accidents. is not smooth, but if it is higher than the preset speed, it will cause waste of fuel

Images