Engine control method and system

Abstract

The invention discloses an engine control method and system. The engine control method includes the steps that the starting time points of an engine are recorded, and the duration between latest two times of starting time points are calculated; if the duration is smaller than a threshold value of the duration, the sliding stopping function is shielded; if the duration is larger than or equal to the threshold value of the duration, the present vehicle speed is obtained; if the present vehicle speed is smaller than a first vehicle-speed threshold value, the sliding stopping function is shielded; if the present vehicle speed is larger than or equal to the first vehicle-speed threshold value, whether the highest vehicle speed after a vehicle in the latest one time is started is smaller than a second vehicle-speed threshold value or not is judged; if the highest vehicle speed after the vehicle in the latest one time is started is larger than or equal to the second vehicle-speed threshold value, it is judged that the present vehicle starting period is non-low-speed driving, and the time of continuous low-speed driving returns to zero; if the highest vehicle speed after the vehicle in the latest one time is started is smaller than the second vehicle-speed threshold value, it is judged that the present vehicle starting period is low-speed driving, and the time of continuous low-speed driving accumulates 1; when the time of continuous low-speed driving reaches the set value, the sliding stopping function is shielded. By means of the engine control method and system, the problems that as the engine is frequently started, the service life of a starting system is shortened, and as the engine is started again in the sliding process, the driving performance of the whole vehicle is influenced are solved.

Description

technical field [0001] The invention relates to the technical field of electronic control, in particular to an engine control method and system. Background technique [0002] Due to the increasingly stringent requirements on the fuel consumption limit of the vehicle, various vehicle manufacturers have an increasingly strong demand for new fuel-saving technologies. The low-speed coasting stop fuel-saving technology has a very obvious fuel-saving effect in the actual driving process. The so-called low-speed coasting to stop fuel-saving technology means that when the vehicle speed drops to a safe speed during deceleration and parking, the vehicle turns off the engine and coasts to stop in neutral gear. During this period, the engine does not need to consume fuel and the vehicle slows down and stops by itself. [0003] However, the current urban traffic conditions are becoming more and more congested, there are more and more traffic jams, the average waiting time for red lights ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an engine control method and system, which solves the problem that using the low-speed coasting shutdown fuel-saving technology in the prior art will cause the engine to start too frequently and affect the life of the starting system, and will also affect the driving of the whole vehicle due to restarting the engine during coasting sexual problems

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