Research Single Drum Chassis Dynamometer Load Test Method Values

Automobile chassis dynamometer can detect the car’s power and also can detect the car’seconomy. As an important kind of laboratory testing equipment, accuracy and reliability of thetest results depends on the chassis dynamometer can accurately simulate the drag cars runningon an actual road surface.For chassis dynamometer can accurately simulate the resistance of cars traveling on anactual road surface, first we must be able to accurately measure the resistance of cars travelingon the actual roads. As driving the car on the chassis dynamometer does not exist airresistance, climbing resistance, rolling resistance of the driven wheel, as well as externalresistance caused by part acceleration resistance, So cars’ running resistance on the chassisdynamometer less than cars driving on the roads. Therefore, in order to better simulate the car’running resistance on the actual road surface, In order to make the car driving force with thesame situation on the actual road surface, Chassis dynamometer through its own loadingdevice to simulate the above air resistance, climbing resistance, rolling resistance of thedriven wheel, as well as external resistance caused by part acceleration resistance. ensure theaccuracy of the car during power performance test and fuel economy test. In this paper, asingle roller chassis dynamometer for the study, the use of mathematical models andassociated test were studied. The main contents and results are as follows:1、Worked out car glide gliding resistance in actual road through multi-speed taxiingmethod In JMC, And the sliding resistance of the sliding speed represented by the leastsquares method with a curvilinear relationship, The results showed no load, when loadedsliding correlation curve relationship between the resistance and the sliding speed were0.98,0.99268.2、Draw a single roller chassis dynamometer resistance by Single roller chassisdynamometer itself glide. Relationship will stand between the resistance and the sliding speedrepresented by curve, Curve shows the relationship between the correlation coefficient curvesand the internal resistance of the carriage between the sliding speed was0.99564.3、Through the establishment of a loaded slide, glide and other secondary load obtainedmathematical model of the car in the carriage rolling resistance, and then obtain a single rollerchassis dynamometer load resistance. The results showed that in the actual road car with thecar on a chassis dynamometer higher correlation coefficient of rolling resistance.4、Compared the calculation of the measured values of load resistance with ChinaAutomotive Engineering Research Institute Co., given the "theoretical" load resistance values, The results showed that: when the vehicle speed is below36km/h, the loading forcecalculation error is higher, but not more than5%, and when the vehicle speed is higher than36km/h, the low loading force calculation error, the error is less than3%, in line with therelevant Claim.This thesis shows that: seeking methods chassis dynamometer load resistance and glidethrough without loading method of secondary load glide feasible. The method of test resultswith high precision and accuracy through the relevant experimental verification.