Idle speed control method for stopping process of engine with starting and stopping functions

Abstract

The present invention proposes a method for controlling idle speed during shutdown of an engine with a start-stop function, which includes the following steps: judging whether the engine is in an idle state, and when it is confirmed that the engine is in an idle state, performing an idle speed timer, and comparing the idle speed timer DT1 with the preset value DT, and perform corresponding stop control according to the comparison result; when it is confirmed that the engine is not in the idling state, judge whether the engine meets the engine stop condition; information, and perform different idle timings according to different states of the engine; after the idle timing is over, it is judged again whether the engine shutdown condition is met, and corresponding processing is carried out. The invention can be widely applied to vehicles with start-stop function, effectively solves engine and turbocharger failures caused by rapid and heavy-load engine shutdown and unlimited frequent start-stop, reduces engine failure rate, and improves vehicle fuel economy at the same time.

Description

technical field [0001] The invention relates to the field of new energy sources, in particular to an idle speed control method for an engine with a start-stop function during shutdown. Background technique [0002] At present, vehicles with start-stop function are prone to heavy load and rapid shutdown after reaching the flameout condition, which is not conducive to the lubrication and cooling of the engine and supercharger, resulting in damage and failure. Under certain special working conditions, the engine starts and stops frequently, which increases the fuel consumption and the loss of the engine and supercharger. [0003] Publication No. 105235679A, "Automobile Engine Shutdown Control Method and Device", proposes an automobile engine shutdown control method, which adopts a suitable fuel-cut shutdown strategy for the engine in coasting or braking conditions, and reduces the engine's high-speed shutdown process. Impact on the vehicle drive train. Specifically, after the...

AI Technical Summary

Problems solved by technology

The idle speed threshold setting is only determined according to the engine water temperature, without considering comprehensive considerations such as engine speed and supercharger status, the idle speed may be too long or too short, which affects economy or cannot fully protect the engine

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