Detection method of surface output power of automobile drive wheel

Abstract

The method of detecting the output power of the surface of the driving wheel of the car is that the car is on the chassis dynamometer, and the rated power point or the maximum torque point of the engine corresponds to the speed of the car, and the constant speed loading control is used to detect the power of the car. The friction resistance power of the wheel roller can be obtained by weighing the tested vehicle Pfi, the bench resistance is a known quantity stored in the computer, and the bench resistance power Pti at the vehicle speed point can be obtained; the specified gear of the gearbox is at the maximum accelerator pedal position, and constant-speed loading control is used for steady-state detection at the corresponding vehicle speed point The loading power Pdi of the power absorbing device can be obtained from the surface output power of the driving wheel under the standard environmental state corresponding to the vehicle speed point Pwi=(Pdi+Pfi+Pti)×a, where a is the power correction coefficient, in order to reduce the influence of the maximum torque vehicle speed error, Torque ratios can be used instead of power ratios to compare limits.

Description

technical field [0001] The method of detecting the output power of the surface of the driving wheel of the car is to put the car on the chassis dynamometer, put the gearbox on the specified gear at the maximum accelerator pedal position, and use the rated power point or maximum torque point of the engine to correspond to the vehicle speed. A method of the invention belongs to the technical field of automobile performance detection methods. Background technique [0002] According to the national standard GB18565-2001 "Comprehensive Performance Requirements and Testing Methods for Commercial Vehicles", the existing technology uses the engine rated power speed point Ve or the maximum torque (rated torque) speed point Vm to detect the power performance. Usually: according to the model series, the gearbox is directly geared. To determine the vehicle speed Ve or Vm, use constant-speed loading control at this vehicle speed point to steadily detect the loading power of the power abs...

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) Since the frictional resistance between the wheel and the drum is proportional to the wheel weight (or axle load), the greater the wheel weight, the greater the frictional resistance. The driving axle load of the fender truck and the detection speed are very different, and the uniformity and comparability of the detection power are poor

(2) If Ve is greater than the actual rated power vehicle speed according to the vehicle model series, and the vehicle speed point falls in the speed regulation section of the engine, the measured power will be too small or very small, resulting in false detection and misjudgment

(3) The error of Vm according to the model series is relatively large. Since the torque near the maximum engine torque is not much different, the error of the vehicle speed is almost completely transmitted to the power error, thus causing the wrong detection and wrong judgment of the dynamic test.