Method and system for controlling idle speeds of engine

Abstract

The invention discloses a method and system for controlling the idle speeds of an engine. The method includes the steps that when an accelerator pedal is completely released, current parameter data for reflecting whole-vehicle practical operation conditions are obtained; the basic idle speed corresponding to the current temperature of water of the engine and a current altitude correction coefficient is obtained to serve as the first basic idle speed; the rotating speed needed by the engine at the current temperature of oil of a gearbox is obtained, and the larger value between the first basic idle speed and the rotating speed required by the engine serves as the second basic idle speed; the third basic idle speed, the fourth basic idle speed and the target idle speed are sequentially determined according to the conditions whether a vehicle is in the first-type experiment working condition or not, whether steering operation exists or not and whether the current vehicle speed is zero or not. By means of the method and system, the lowest rotating speed capable of reliably maintaining running of the engine under the whole-vehicle practical operation condition can be determined through the current parameter data to serve as the current target idle speed for outputting, and the problem that the idle speed is excessively high or excessively low can be further solved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an engine idle speed control method and system for an automobile equipped with a wet dual-clutch gearbox. Background technique [0002] For cars equipped with wet dual-clutch gearboxes, the existing engine idle speed adjustment method is usually to control the engine idle speed according to the engine water temperature, the dual clutch state of the gearbox, the gear information and the gearbox oil temperature. If the engine idle speed is too high, It will lead to high fuel consumption. If the engine idle speed is too low, it will lead to unstable idle speed or difficulty in starting. Therefore, the appropriate engine idle speed should be the lowest speed that can reliably maintain the engine running. The minimum speed directly depends on the current actual operating conditions of the vehicle. Controlling the engine idle speed based solely on the above four parameters obviousl...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiment of the present invention is to solve the problem of low control accuracy existing in the existing engine idle speed control method, and provide an engine idle speed control method and system with higher control accuracy based on the current actual operating conditions of the vehicle

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