METHOD OF DETECTING A VEHICLE SPEED AND RELATED ELECTRONIC DEVICE

• US 20130332040A1
• Filed: 09/10/2012
• Published: 12/12/2013
• Est. Priority Date: 06/11/2012
• Status: Active Grant

• Current Assignee: Wistron Corporation
• Original Assignee: Meng-Kai Lin, Tung-Ming Wu
• Inventors: Wu, Tung-Ming, Lin, Meng-Kai
• Granted Patent: US 8,738,263 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60K 2031/0033 Detecting longitudinal speed or acceleration of target vehicle
• CPC Class Codes: G01S 13/60 wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track G01S13/64 takes precedence

Abstract

A method of detecting a vehicle speed is disclosed in the present invention. The method includes outputting a detecting wave, receiving a reflecting wave from an external object when the external object passes through a covering range of the detecting wave, calculating a variation between the detecting wave and the reflecting wave, and reading a table for executing an application program according to information of the table.

Claims

1. A method of detecting a vehicle'"'"'s speed, the method comprising:

outputting a detecting wave;

receiving a reflecting wave from an external object when the external object passes through a covering range of the detecting wave;

calculating a frequency variation between the detecting wave and the reflecting wave; and

reading a table for executing an application program according to the frequency variation and information of the table.

2. The method of claim 1, wherein executing the application program according to the frequency variation and the information of the table comprises:

outputting a warning signal when the frequency variation is positive.

3. The method of claim 2, wherein executing the application program according to the frequency variation and the information of the table further comprises:

calculating a speed variation between the external object and an emitter outputting the detecting wave by a Doppler formula;

reading a moving speed of the emitter from a processor of the emitter; and

calculating and displaying a moving speed of the external object according to the speed variation and the moving speed of the emitter.

4. The method of claim 2, wherein outputting the warning signal comprises:

driving the emitter to generate an acoustic wave or an optical wave when the frequency variation is greater than a first threshold value and smaller than a second threshold value; and

decelerating a moving speed of the emitter when the frequency variation is greater than the second threshold value;

wherein the second threshold value is substantially greater than the first threshold value.

5. The method of claim 4, wherein a frequency or an intensity of the acoustic wave and the optical wave is adjusted according to a value of the frequency variation.

6. The method of claim 1, wherein executing the application program according to the frequency variation and the information of the table comprises:

calculating a speed variation between the external object and an emitter outputting the detecting wave by a Doppler formula when the frequency variation is negative;

reading a moving speed of the emitter from a processor of the emitter; and

calculating and displaying a moving speed of the external object according to the speed variation and the moving speed of the emitter.

7. The method of claim 1, wherein the table comprises a plurality of threshold values and a plurality of application programs, each application program is executed when the frequency variation is within a range of the corresponding threshold value.

8. The method of claim 7, wherein the plurality of application programs comprises functions of generating an acoustic wave or an optical wave by an emitter with detecting wave transmission, and decelerating a moving speed of the emitter.

9. An electronic device disposed on an emitter, the electronic device being capable of detecting a moving speed of an external object, the electronic device comprising:

a wireless signal transceiver for outputting a detecting wave and for receiving a reflecting wave from an external object when the external object passes through a covering range of the detecting wave;

a memory module for storing a table, the table comprising a plurality of threshold values and a plurality of application programs; and

a control unit electrically connected to the wireless signal transceiver and the memory module, and further coupled to the emitter in an external connection, the control unit calculating a frequency variation between the detecting wave and the reflecting wave, reading the table and executing the corresponding application program according to the frequency variation and the threshold value;

wherein each application program is executed when the frequency variation is within a range of the corresponding threshold value, and the electronic device is a vehicle operation recorder.

10. The electronic device of claim 9, wherein the control unit drives the emitter to output a warning signal when the frequency variation is positive, or reads a moving speed of the emitter from a processor of the emitter for calculating the moving speed of the external object by a Doppler formula.

11. The electronic device of claim 10, wherein the control unit drives the emitter to generate an acoustic wave or an optical wave and to decelerate a moving speed of the emitter according to the frequency variation and the threshold value when the frequency variation is positive.

12. The electronic device of claim 10, wherein a frequency or an intensity of the acoustic wave and the optical wave is adjusted according to a value of the frequency variation.

13. The electronic device of claim 9, wherein the control unit reads a moving speed of the emitter from a processor of the emitter for calculating the moving speed of the external object by a Doppler formula when the frequency variation is negative.

14. The electronic device of claim 9, wherein the control unit further drives a panel of the emitter to display the moving speed of the external object.

15. An electronic device disposed on an emitter, the electronic device being capable of detecting a moving speed of an external object, the electronic device comprising:

a wireless signal transceiver for outputting a detecting wave and for receiving a reflecting wave from an external object when the external object passes through a covering range of the detecting wave;

a memory module for storing a table, the table comprising a plurality of threshold values and a plurality of application programs; and

a control unit electrically connected to the wireless signal transceiver and the memory module, and further coupled to the emitter in a built-in manner, the control unit calculating a frequency variation between the detecting wave and the reflecting wave, reading the table and executing the corresponding application program according to the frequency variation and the threshold value;

wherein each application program is executed when the frequency variation is within a range of the corresponding threshold value, and the electronic device is a vehicle operation recorder.

16. The electronic device of claim 15, wherein the control unit drives the emitter to output a warning signal when the frequency variation is positive, or reads a moving speed of the emitter from a processor of the emitter for calculating the moving speed of the external object by a Doppler formula.

17. The electronic device of claim 16, wherein the control unit drives the emitter to generate an acoustic wave or an optical wave and to decelerate a moving speed of the emitter according to the frequency variation and the threshold value when the frequency variation is positive.

18. The electronic device of claim 16, wherein a frequency or an intensity of the acoustic wave and the optical wave is adjusted according to a value of the frequency variation.

19. The electronic device of claim 15, wherein the control unit reads a moving speed of the emitter from a processor of the emitter for calculating the moving speed of the external object by a Doppler formula when the frequency variation is negative.

20. The electronic device of claim 15, wherein the control unit further drives a panel of the emitter to display the moving speed of the external object.