A neutral idle speed control method and device for an automatic transmission

Abstract

The invention provides an automatic gearbox neutral gear idle speed control method and an automatic gearbox neutral gear idle speed control device, and belongs to the technical field of automobiles. The problem of poor driving experience in the prior art is solved. The automatic gearbox neutral gear idle speed control method comprises the steps that a gear where a gear shifting rod is located at present is detected; a master cylinder pressure value of a brake pedal is detected; current vehicle speed is detected; a vehicle accelerator pedal signal is detected; when brake master cylinder pressure, the gear where the gear shifting rod is located at present, the accelerator pedal signal and the current vehicle speed are met a preset condition, neutral gear idle speed control is carried out, and an automatic clutch is controlled to a sliding and grinding state from a joint state; and after the neutral gear idle speed control is carried out, when the brake master cylinder pressure is less than a preset pressure threshold value, the accelerator pedal signal is stepping on the gas or the gear where the gear shifting rod is located at present is N gear or P gear, the neutral gear idle speedcontrol is quit. According to the automatic gearbox neutral gear idle speed control method and the automatic gearbox neutral gear idle speed control device, the driving experience can be improved when the vehicle waits red lights or in traffic jam.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and relates to a method and a device for controlling the neutral idle speed of an automatic transmission. Background technique [0002] With more and more vehicles, in urban road conditions, traffic jams or waiting for red lights are often encountered. In the above situations, drivers often put the vehicle's gear in D gear and keep stepping on the brakes. Waiting for the red light, the clutch is engaged at this time, the hydraulic rheostat is always working, and the car does not move for a long time, the vibration of the whole vehicle increases, which affects the driver's experience, and may also affect the durability of the gearbox, the shifting quality and the vehicle. It will have adverse effects on the handling performance of the gearbox and greatly affect the service life of the gearbox. [0003] In view of the above-mentioned problems, the existing Chinese patent literature discloses a...

AI Technical Summary

Problems solved by technology

Although this control method can automatically switch the gear from D gear to N gear when the vehicle is waiting for a red light or in a traffic jam, to achieve the effect of saving fuel consumption, but this control method will produce vibration when the D gear is stepped on the brake and enters neutral gear, and when stepping on When the accelerator is started, the clutch should be combined with gear shifting. At this time, the vehicle has already started, and the starting response will be very slow, and the starting feeling will be poor. There is a problem of poor driving experience.

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