Automatic speed changing and gear shifting amending method according to recognition of vehicle mass and ramp slope

Abstract

The invention discloses an automatic speed changing and gear shifting amending method according to recognition of vehicle mass and ramp slope. The automatic speed changing and gear shifting amending method is characterized by comprising the following steps of performing recognition on vehicle mass, a rolling resistance coefficient and an air resistance coefficient when a vehicle is on a flat road surface, and providing calibrating quantity and known quantity for the recognition of the vehicle mass and the ramp slope when the vehicle drives on a ramp, so that the recognizing accuracy of the vehicle mass and the recognizing accuracy of the ramp slope are improved; and according to the vehicle mass and the ramp, performing the ramp gear shifting amending control, so that the situation that gear shifting is frequently performed when the vehicle drives on the ramp is avoided, and the gear shifting smoothness and the intelligent level of the automatic speed changing of the vehicle are improved.

Description

technical field [0001] The invention relates to a vehicle automatic transmission control method, in particular to a vehicle mass and slope recognition and automatic transmission shift correction method. Background technique [0002] The shift schedule of the vehicle's automatic transmission is formulated based on a good level road surface. When the vehicle is on a slope, the dynamic shift schedule is generally adopted. The change of the slope of the vehicle driving the road surface will cause the change of the driving resistance, resulting in the best performance of the vehicle. The shift point will also change, but in the traditional shift schedule, due to the change of the load weight and the number of passengers, the vehicle quality often changes, and there are large differences in the optimal shift point under different vehicle quality conditions. There is a significant difference between the gear shift schedules between no-load and full-load, and the change of vehicle q...

AI Technical Summary

Problems solved by technology

The sensor-based identification method uses a large number of sensors to measure vehicle parameters. The sensors require high precision and high cost, which is not conducive to the promotion and use of products; the identification method based on the vehicle dynamics model requires the support of an accurate vehicle dynamics model. It is difficult to obtain in the middle of the road, and it is only used in simulation; the recognition method based on the least squares algorithm cannot obtain the accurate time-varying characteristics of the system, and the recognition accuracy of the changing vehicle mass and road slope is low

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