Method for detecting dynamic performance of automobile based on loading and inertia

Abstract

The invention provides a method for detecting dynamic performance of an automobile based on loading and inertia. An automobile is arranged on a chassis power measurement machine with quite big equivalent inertia; a power absorption device loads with constant current or constant force; the loading force is smaller than the driving force of a driving wheel; and the equivalent inertia M of the chassis power measurement machine, the equivalent inertia m of a rotation piece of an automobile neutral position power transmission system and the rotation inertia Ie of an engine are combined to server as loading load, so instantaneous power Pca of the driving wheel and the inertia power Pja of the engine at the rated torque rotation point na of the engine are detected. When the automobile is idling, the resistance power Pha of a vehicle wheel roller system during idling sliding at the same speed point is measured, loss power Pf of engine accessories at the rotation speed point na is estimated, and the power at the standard environment state of the corrected Pca+Pja+Pha+Pf is the engine rated torque power.

Description

technical field [0001] Loading and inertia detection method of automobile dynamics is a method of testing various types of automobiles on a chassis dynamometer with a relatively large equivalent inertia, using the loading force of the power absorbing device and the inertia of the bench as the load, and testing the instantaneous power of the rated torque point of the engine in a bench test A method belongs to the technical field of automobile performance detection methods. Background technique [0002] Existing technology detects the power performance of automobile engine and usually adopts the bench test loading force method, and the automobile is on the chassis dynamometer, and the power absorbing device acts the loading force on the driving wheel of the automobile to detect the power in a steady state, which has the following disadvantages: (1) The rated torque and rotational speed of the gasoline engine are relatively high, and the power absorbing device will generate an ...

AI Technical Summary

Problems solved by technology

[0002] Existing technology detects the power performance of automobile engine and usually adopts the bench test loading force method, and the automobile is on the chassis dynamometer, and the power absorbing device acts the loading force on the driving wheel of the automobile to detect the power in a steady state, which has the following disadvantages: (1) The gasoline engine has a high rated torque and speed, and the power absorbing device will overload the driving wheels of the car, which is easy to damage or damage the car engine in use

(2) It is difficult to accurately find the rated torque speed of the engine on the chassis dynamometer for a car with a hydraulic transmission automatic transmission, and it is difficult to detect the constant speed or constant force in a steady state. The steady state detection takes a long time, and it is easy to damage or damage the car in use. engine