Automobile driving wheel surface output power detection method

Abstract

The invention relates to an automobile driving wheel surface output power detection method. According to the method, on a chassis dynamometer of an automobile, constant speed loading control detection is performed on the dynamic performance of the automobile based on a speed point corresponding to the rated power point or maximum torque point of an engine; the detected automobile can be weighed, so that frictional resistance power Pfi of the roller of the wheel of the automobile can be obtained, and bench resistance is known quantity stored in a computer, and therefore, the bench resistance power Pti of the speed point can be obtained; when a gearbox is shifted to a specified gear where a maximum accelerator pedal position is located, constant speed loading control steady state is adopted to detect the loading power of Pdi of a power absorption device at a corresponding speed point, and therefore, the driving wheel surface output power Pwi of the corresponding speed point under a standard environmental state can be expressed by the equation that Pwi=(Pdi+Pfi+Pti)*a, wherein a is a power correction coefficient; and in order to reduce the influence of maximum torque speed errors, a torque ratio can be adopted to replace a power ratio to be compared with a limit value.

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.