单滚筒底盘测功机主要参数测定方法研究

Study on main parameter determination of single cylinder chassis dynamometers

针对单滚筒底盘测功机在测量过程中出现测量精度降低的问题,运用实验法对单滚筒底盘测功机的测力系统、测速系统分别提出校准方法,利用惯性原理对基础惯量、寄生阻力和加载阻力分别进行测定。试验数据表明:测力系统最大偏差处的误差仅为0.02%,测速系统最大偏差<0.01%,测得的基础惯量值偏差小、稳定性高,测得的测功机寄生阻力最大偏差值仅为-1.41N,汽车在道路上的行驶阻力与校准后的底盘测功机上的行驶阻力的最大偏差均<5%,证明该校准方法精度高、可靠,为单滚筒底盘测功机的校准提供理论依据和参考价值。

Calibration methods for force-measuring system and velocity-measuring system are separately proposed on the basis of experimentation to enhance the measurement accuracy of single cylinder chassis dynamometers. The basic inertia,parasite drag and load resistance are determined via the principle of inertia. According to experimental data,the error at the max deviation of the force-measuring system is merely 0.02% and the max deviation of the velocity-measuring system is less than 0.01%. Moreover,the basic inertia value is small in deviation and high in stability,whereas the max. deviation of the parasite drag is only-1.41 N. The max deviations in the running resistance of vehicle and the corrected running resistance of the chassis dynamometer are both lower than 5%. Experimental data show that this new calibration method is accurate and reliable and has provided theoretical basis and reference value for calibrating single-cylinder chassis dynamometers.