Method of evaluating integrated running energy of vehicle in wind tunnel

Patent metadata

Field	Value
Publication number	US-11536626-B2
Application number	US-202117306405-A
Country	US
Kind code	B2
Filing date	May 3, 2021
Priority date	Sep 16, 2020
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A method of evaluating integrated running energy of a vehicle in a wind tunnel may include estimating change in fuel efficiency according to change of vehicle parts thereby facilitating precise measurement of running energy.

First claim

What is claimed is:

1. A method of evaluating integrated running energy of a vehicle in a wind tunnel, the method comprising:
placing the vehicle in the wind tunnel;
changing vehicle speeds by rotating wheels of the vehicle to obtain a plurality of constant speed sections and a plurality of speed change sections, wherein the vehicle speeds are held constant in each constant speed section, the plurality of constant speed sections have different constant speeds with each other, and the vehicle speeds are increased or decreased between adjoining constant speed sections in the plurality of speed change sections;
measuring and collecting exerted forces for rotating the wheels in each of the plurality of constant speed sections and exerted forces for rotating the wheels in each of the plurality of speed change sections;
separating the exerted forces in each of the plurality of constant speed sections from the exerted forces in each of the plurality of speed change sections;
determining running energy of the plurality of constant speed sections according to the separated exerted forces in each of the plurality of constant speed sections and determining running energy of the plurality of speed change sections according to the separated exerted forces in each of the plurality of speed change sections; and
acquiring the integrated running energy of the vehicle according to the running energy of the plurality of constant speed sections and the running energy of the plurality of speed change sections.

2. The method of claim 1 , wherein the wind tunnel includes:
a wheel rotating device configured to rotate the wheels of the vehicle; and
a force measurement portion configured to measure driving force by which the wheel rotating device rotates the wheels to measure the exerted forces.

3. The method of claim 1 , further including:
before obtaining the plurality of constant speed sections and the plurality of speed change sections, performing a warm-up of the wheels where the wheels of the vehicle are rotated at a constant speed for a predetermined time period and the exerted forces for rotating the wheels are measured and collected.

4. The method of claim 3 , wherein, in performing the warm-up of the wheels, a wind speed in the wind tunnel is set to zero and the wheels are rotated at the constant speed.

5. The method of claim 3 , wherein, when change in the measured forces is kept within a predetermined range for a preset time period, the warm-up is terminated.

6. The method of claim 1 , wherein each of the plurality of constant speed sections is arranged to be spaced apart by a preset speed interval, and a speed of the wheels maintained in each of the plurality of constant speed sections is measured for a preset time or longer than the preset time.

7. The method of claim 6 , wherein the exerted forces in each of the plurality of constant speed sections are separated from the exerted forces in each of the plurality of speed change sections according to a preset force difference value.

8. The method of claim 7 , wherein the plurality of constant speed sections includes:
a first constant speed section, wherein a first speed of the wheels is maintained and a first force is exerted to rotate the wheels;
a second constant speed section, wherein a second speed smaller than the first speed by a first speed interval is maintained and a second force smaller than the first force is exerted to rotate the wheels; and
a first speed change section, wherein the first speed is decelerated to the second speed,
wherein a magnitude of force measured in the first speed change section has a range between the first force and the second force and includes a magnitude which is smaller than a magnitude of the second force.

9. The method of claim 8 , wherein measured force values falling in a range of the first force and a preset lower limit force are excluded from forces in the first speed change section, and the preset lower limit force is obtained by subtracting the preset force difference value from the first force.

10. The method of claim 9 , wherein, when a speed at a time of measuring one of the measured force values excluded from the first speed change section is greater than the second speed, the measured force value is included in the forces in the first speed change section.

11. The method of claim 1 , wherein in the determining of the running energy in the plurality of constant speed sections, the running energy in each constant speed section is obtained by multiplying an exerted force in each constant speed section, an average of wheel speeds, and a time.

12. The method of claim 1 , wherein in the determining the running energy in the speed change section, the running energy is determined by multiplying an exerted force of each speed change section by an average of wheel speeds for each time and a time.

13. The method of claim 1 , wherein the integrated running energy is determined by adding running energy used during deceleration or acceleration to the running energy in the constant speed section.

14. A non-transitory computer readable storage medium on which a program for performing the method of claim 1 is recorded.

15. A method of evaluating integrated running energy of a vehicle in a wind tunnel, wherein a test vehicle is positioned in the wind tunnel provided with a wheel rotating device and wheels of the test vehicle are rotated by the wheel rotating device, the method comprising:
performing a warm-up of the test vehicle;
evaluating deceleration of the test vehicle;
separating data obtained from the evaluating of the deceleration of the test vehicle, into a plurality of constant speed sections and a speed change section;
determining running energy of the plurality of constant speed sections and running energy of the speed change section; and
acquiring the integrated running energy of the vehicle according to the determined running energy of the plurality of constant speed sections and the determined running energy of the speed change section.

16. The method of claim 15 , wherein, in performing the warm-up of the wheels, a wind speed in the wind tunnel is set to zero and the wheels are rotated at a constant rotation speed.

17. The method of claim 15 , further including:
before or after the evaluating of the deceleration of the test vehicle, evaluating acceleration of the test vehicle.

18. The method of claim 15 , wherein the evaluating of the deceleration of the test vehicle includes:
arranging the plurality of constant speed sections where a constant speed of the wheels is maintained for a predetermined time period for each preset speed section and the speed change section where a speed of the wheels is reduced between the plurality of constant speed sections; and
measuring forces exerted in each of the constant speed sections and the speed change section.

19. The method of claim 18 , wherein, in the separating of the data obtained from the evaluating of the deceleration of the test vehicle, into the plurality of constant speed sections and the speed change section, the force exerted in each of the constant speed sections and the force exerted in the speed change section are classified according to a preset criterion.

20. A non-transitory computer readable storage medium on which a program for performing the method of claim 15 is recorded.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Jeong Ji Min
• Chang Jin Hyuck
• Chung Min Sik

Classifications

• G01M17/0072

  the wheels of the vehicle co-operating with rotatable rolls (G01M17/022, G01M17/045, G01M17/065 take precedence) · CPC title

• G01M17/0074

  Details, e.g. roller construction, vehicle restraining devices · CPC title

• G01M9/06 Primary

  Measuring arrangements specially adapted for aerodynamic testing · CPC title

• G01M9/02

  Wind tunnels · CPC title

• G01M9/062 Primary

  Wind tunnel balances; Holding devices combined with measuring arrangements · CPC title