Method and device for determining automobile drag coefficient

Abstract

The embodiment of the invention provides a method and a device for determining an automobile drag coefficient. The method comprises the following steps: in a determined automobile model, intercepting an automobile section along the length direction of the automobile, wherein the automobile section is vertical to the axis direction of the automobile; according to the intercepted automobile section and the automobile model, determining the contour line of the automobile section; according to the contour line of the automobile section, determining a discrete type model corresponding to the automobile model; and according to the discrete type model and the set physical condition and boundary condition of the model, determining the automobile drag coefficient. When the embodiment of the invention is applied, one automobile section is intercepted along the length direction of the automobile, the contour line of the automobile section is determined according to the automobile section, and the discrete type model corresponding to the automobile model is determined according to the contour line of the automobile section so as to determine the automobile drag coefficient. The method greatly reduces computation data, simplifies computation processes and improves automobile development efficiency.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to a method and a device for determining the drag coefficient of an automobile. Background technique [0002] The drag coefficient of a car is an important coefficient for calculating the air resistance of a car. It can be used to calculate the air resistance of a car while driving. The smaller the drag coefficient, the less affected it is by air resistance; otherwise, the greater the impact of air resistance. The drag coefficient is directly proportional to the fuel consumption of the car, so reducing the air drag coefficient has important practical significance for reducing the fuel consumption of the car. [0003] The size of the drag coefficient depends on the shape of the car. Generally speaking, the drag coefficient of most cars we see on the road is between 0.28 and 0.4. There are some cars that reach around 0.15. [0004] At present, the method of verifying the...

AI Technical Summary

Problems solved by technology

However, due to the large amount of data of the vehicle model and the complex calculation process, the period for determining the drag coefficient is relatively long, which affects the efficiency of vehicle development

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