Gear shifting control method for automatic transmission without rotating speed sensor

Abstract

The invention relates to an automatic transmission control method without a speed sensor, which is used for controlling an automatic transmission of a vehicle, and the vehicle comprises a left front wheel, a left rear wheel, a right front wheel, a right rear wheel and wheel speed sensors used for measuring the rotating speeds of the left front wheel, the left rear wheel, the right front wheel and the right rear wheel respectively. The method comprises the following steps: acquiring wheel speed data of four wheels measured by a wheel speed sensor of a vehicle; and when the wheel speed data is valid and the vehicle is in a normal driving state, calculating the driving speed of the vehicle by using the wheel speed data, calculating the rotating speed of each element of the transmission according to the driving speed of the vehicle, and controlling the automatic transmission by using the obtained rotating speed of each element of the transmission. The rotating speed of each shaft of the transmission can be reliably calculated by utilizing the existing wheel speed sensor on the vehicle, so that corresponding control is realized, a special rotating speed sensor does not need to be arranged, the cost is reduced, and the defects caused by the arrangement of the rotating speed sensor are avoided.

Description

technical field [0001] The invention belongs to the technical field of vehicles, and in particular relates to a shift control method of an automatic transmission without a rotational speed sensor. Background technique [0002] For multi-speed transmissions with two or more gears, there are one or more speed sensors. The speed sensors are mainly used to measure the speed of the transmission input shaft, output shaft or other internal gears. These speeds are used to judge the work of the transmission. state. For example, comparing transmission ratios can determine whether slippage occurs and calculate transmission shift points. [0003] Speed ​​sensors used in transmissions measure the speed of the tooth tips of the gears. However, due to the existence of many iron parts inside the transmission, iron impurities will gradually increase with the increase of the use time of the transmission. These impurities will gradually adsorb to the measuring surface of the speed sensor, wh...

AI Technical Summary

Problems solved by technology

However, due to the many iron parts inside the transmission, the iron impurities will gradually increase with the increase of the transmission time, and these impurities will gradually adsorb to the measurement surface of the speed sensor, directly affecting the accuracy of the sensor

In addition, if enough impurities are adsorbed, it may cause sensor failure and cause transmission failure

In addition, due to the influence of the installation position, the sensor's low speed accuracy will be different

The distance from the bottom surface of the sensor to the tooth top of the gear is called the installation clearance. The smaller the clearance, the higher the accuracy of the low speed will be, but a little magazine or poor coaxiality of the gear will cause the sensor to fail; The better the pollution resistance, but the accuracy of the speed will be worse, the speed sensor has strict requirements on the installation clearance

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