Automatic Transmission Idling Center Control Method

Abstract

The invention discloses a method for controlling the neutral position of the idle speed of an automatic transmission, which comprises: a transmission controller receives the parameters of the current working condition, and judges whether the current working condition satisfies the enabling condition of the neutral position control of the idle speed; if the current working condition If the parameters meet the enabling conditions of the idle neutral control, the idle neutral control is triggered; the pressure of the neutral control clutch is released to the first threshold; when the vehicle speed drops to the set target value, the brake is precharged When the vehicle speed drops to zero, continue to release the pressure of the neutral control clutch and disconnect the power transmission system; when the pressure of the neutral control clutch is completely released, increase the pressure of the brake to the first The second threshold is used to brake the output shaft of the gearbox. The invention further reduces the fuel consumption of the vehicle through the design of the control strategy, enhances the power and comfort of the vehicle at the starting stage, and avoids the risk of the vehicle rolling back during the application of the idling neutral position control function.

Description

technical field [0001] The invention relates to the technical field of automatic transmission control of automobiles, in particular to an idle neutral control method of an automatic transmission. Background technique [0002] An automatic transmission is a transmission device that can automatically shift gears according to the vehicle speed and engine speed relative to the manual transmission. At present, there are four common types of automotive automatic transmissions, namely hydraulic automatic transmission (AT), mechanical continuously variable automatic transmission (CVT), electronically controlled mechanical automatic transmission (AMT) and dual-clutch automatic transmission. [0003] For hydraulic automatic transmissions, the idle center control function plays an important role in improving vehicle fuel economy and comfort. And the existing idling middle position control method is as follows: when the vehicle is in the forward gear (D gear) idling stop, the gear posi...

AI Technical Summary

Problems solved by technology

[0004] However, the idle neutral control function is only activated when the vehicle is completely stationary, that is, when the vehicle speed is zero. The transmission system vibrates, which affects driving comfort; and the idle speed control process is entered after the vehicle stops, and the time to enter the actual neutral position is relatively long, the actual load of the engine is large, and the fuel consumption is relatively large

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