Engine idle speed control method based on wet dual clutch automatic transmission

Abstract

The invention discloses an engine idle speed controlling method based on wet-type double clutch automatic transmission box The controlling method includes the steps that according to the vehicle speedand opening of an accelerator pedal, whether a transmission box is in a peristalsis state or not is determined; and combining with the clutch state, modificatory marking bits in different idle speedsare arranged to make an engine controller control the engine to carry out idle running according to different idle speed values. According to the engine idle speed controlling method based on wet-type double clutch automatic transmission box, based on a vehicle by using the wet-type double-clutch automatic transmission box, and through improvement of a controlling method for a transmission box controller and an engine controller of the vehicle, the engine of the vehicle can stably implement idle requests and obtain suitable idle speed values selectively so that driveability of the whole vehicle in a peristalsis and idle speed working condition is improved. Furthermore, a solution for saving whole vehicle fuel consumption on a steady idle speed basis is further provided.

Description

technical field [0001] The invention relates to the field of engine idle speed control, in particular to an engine idle speed control method based on a wet double clutch automatic transmission. Background technique [0002] In urban traffic jams, climbing or turning, etc., the wet dual-clutch automatic transmission will often be in creeping conditions. At this time, the vehicle needs to overcome a large resistance, resulting in a large The higher the vehicle speed, the higher the clutch pressure will be. Therefore, under this kind of industrial control, it is easy to cause the engine to be dragged or even stalled. At this time, the transmission controller can make an idle speed control request to the engine controller, for example, control the engine idle speed through the calibrated idle speed target value (or called idle speed reference value), so that the engine speed can be maintained within the required reference idle speed range. [0003] In actual application, becaus...

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Problems solved by technology

[0003] In actual application, because the load on the engine end from the transmission end may be too large, it is difficult for the engine to stabilize the speed within the reference idle speed range, resulting in obvious fluctuations in the engine speed and poor drivability of the vehicle. The idle speed target value may not be suitable, but for wet dual clutch automatic transmission, there is no effective solution

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