Method for controlling sudden acceleration tyre slipping gear shifting for AMT (automatic manual transmission) vehicle

Abstract

The invention relates to a method for controlling sudden acceleration tyre slipping gear shifting for an AMT (automatic manual transmission) vehicle. The method is characterized in that wheel speed signals of four wheels of a vehicle and output shaft rotation speed gradient signals are collected and are respectively transmitted to a TCU (transmission control unit) for analyzing; when wheel speed difference V or output shaft rotation speed gradient NTG is greater than calibration entry conditions Vin or NTGout, a system instantly enters the sudden acceleration tyre slipping gear shifting control, no matter what gear is sent out by Gp_new, the system keeps the existing gear Gp; when the wheel speed difference V or the output shaft rotation speed gradient NTG is less than calibration exit conditions Vout or NTGout, the system record is less the time T of a calibration value, if T is less than Tout, the system does not exit the sudden acceleration tyre slipping gear shifting control; and if T equals to Tout, the system exits the sudden acceleration tyre slipping gear shifting control instantly and enters a normal gear shifting control, namely Gp equals to Gp_new. Through implementing the control method above by an AMT, the conditions of gear lifting and motive power interruption of the vehicle caused by the sudden acceleration tyre slipping are avoided, thus the vehicle gear shifting satisfies the intention of a driver, the safety of starting acceleration and side overtaking is ensured, and simultaneously the normal gear lifting function is not influenced.

Description

technical field [0001] The invention belongs to the shifting control technology of automobile transmission, in particular to a method for controlling a vehicle equipped with a mechanical automatic transmission under the condition of rapid acceleration. technical background [0002] AMT transmission (abbreviation for Automatic Manual Transmission) is based on the original manual transmission with the addition of gear selection and clutch execution motors to replace the manually operated gear selection handle and clutch pedal. Its cost is about higher than that of manual transmission. The cost of automatic transmission (AT) is much lower, so it has the advantages of high transmission efficiency and economical benefits like manual transmission. AMT transmission has been favored by major automobile manufacturers since the 1980s due to its advantages of high transmission efficiency, compact mechanism, reliable operation and low price, and its research is also heating up year by y...

AI Technical Summary

Problems solved by technology

In this case, if no corresponding treatment is taken, the transmission control unit mistakenly believes that the vehicle speed calculated from the wheel speed signal or the output shaft speed signal has increased, so according to the shift map (such as figure 1 ) takes an unexpected upshift action, the clutch is disengaged in order to cooperate with the shift, resulting in a loss of vehicle power

This kind of power interruption is inconsistent with the driver's intention, which is likely to cause safety accidents

If such a situation occurs when the vehicle is overtaking, the driver suddenly accelerates in the overtaking lane, and then suddenly encounters the drive wheel slipping, the vehicle upshifts and the power is interrupted, resulting in the vehicle losing power unexpectedly, and rear-end collisions are likely to occur

At the same time, when the vehicle returns through the slippery road surface, the actual speed of the vehicle does not change compared with that before the upshift. However, due to the lack of power of the upshift vehicle, this situation is unpredictable. If a vehicle is followed behind the overtaking lane It is very dangerous to overtake and the unexpected power interruption of the vehicle in front

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