Design And Experimental Verification Of Light Vehicle Electric Chassis Dynamometer

The fast development of science and technology led to the rapid development of theautomotive industry. Now China’s automobile demand in quantity and performance areconstantly improving, the accuracy of auto test equipment required to increase. Advancedtesting equipment for automotive have brought great convenience to performance testing,fault diagnosis and maintenance which prolonged the service life of the automobile andpromoted the healthy development of the automotive industry. The vehicle chassisdynamometer test platform is transferred from testing yard to indoor. The computer systemcontrol chassis dynamometer based on the sensor signals. The vehicle performance such aspower, fuel economy, exhaust can be precisely detected by chassis dynamometer and notaffected by external factors such as weather. The test accuracy and situation were better thanever. The chassis dynamometer designed in this paper is applied to light vehicles. It uses moreadvanced control technology in the world and gets more convincing data. The AC motor isarranged at middle of two rollers. The mid-set type chassis dynamometer can save occupationarea and installation cost. Asynchronous AC motor can not only be used as motor but alsogenerator which have a less energy cost.There is a clear design idea in this paper. The mechanical structure of chassisdynamometer was designed at first. According to basic principle of chassis dynamometer,aequivalent between road resistance load stress model and the load force model is be found.A2D diagrammatic sketch and a3D one of the chassis dynamometer were drawn by CATIA.Dynamometer’s control system is divided into software part and hardware part.The Siemenscontrol cabinet and local area network field bus (CAN) is used to control hardware system.The direct torque control technology improve the precision and stability of the system. In the part of software system, modular design method was used and the system has a goodportability. In addition, PID feedback control can improve testing accuracy. Finally theparameters on the performance of chassis dynamometer, such as sensor, moment of inertia,sliding test, drum parasitic resistance had been calibrated by experiment. By comparing theroad test data with actual vehicle data, the chassis dynamometer have a high accuracy.