一、前言为精确测定拖拉机驱动轮或履带滑转率,国内外农机测试工作者曾提出滑转率的各种测定方法。由滑转率定义可得,滑转率的测定实际上可转换为拖拉机行驶速度的测量。但这些方法都是用与路面接触的车轮作传感器源,在测量前均需标定,且假定空载和负荷时动力半径均不变,所以有相当的测量误差。且不可避免地受到与地面条件等因素变化的影响,特别对水田土壤等田 I. INTRODUCTION In order to accurately measure the tractor drive wheel or track slip, domestic and foreign agricultural test workers have proposed various measurement methods for slip rates. As defined by the slip rate, the determination of the slip rate can in fact be converted into a measurement of the tractor travel speed. However, all of these methods use the wheel in contact with the road as a sensor source, and are calibrated before the measurement. Assuming no change in the dynamic radius at no-load and load, there is considerable measurement error. And inevitably affected by changes in the ground conditions and other factors, especially paddy soil and other fields