Vehicle camera cleaning system

• US 10,479,327 B2
• Filed: 12/01/2016
• Issued: 11/19/2019
• Est. Priority Date: 03/16/2015
• Status: Active Grant

• Current Assignee: Thunder Power New Energy Vehicle Development Company Limited
• Original Assignee: Thunder Power New Energy Vehicle Development Company Limited
• Inventors: Hsiao, Jen-Chieh, Wu, Tai-Te, Chen, Yen-An
• Primary Examiner(s): Fuller, Rodney E
• Application Number:
  US15/366,751
• Publication Number:
  US 20170080904A1
• Time in Patent Office: 1,083 Days
• Field of Search: 396429
• CPC Class Codes: B08B 3/02 Cleaning by the force of jets or sprays
• CPC Class Codes: B08B 3/10 with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
• CPC Class Codes: B08B 5/02 Cleaning by the force of jets, e.g. blowing-out cavities airguns or nozzles per se B05B1/005
• CPC Class Codes: B60S 1/0862 including additional sensors vehicle speed sensors B60S1/0896
• CPC Class Codes: B60S 1/485 including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
• CPC Class Codes: B60S 1/52 Arrangement of nozzles; Liquid spreading meansnozzles per se B05B
• CPC Class Codes: B60S 1/54 using gas, e.g. hot air
• CPC Class Codes: B60S 1/56 specially adapted for cleaning other parts or devices than front windows or windscreens rear-view mirror arrangements mounted on vehicle exterior including cleaning devices B60R1/0602
• CPC Class Codes: B60S 1/566 including wiping devices B60S1/563, B60S1/583 take precedence
• CPC Class Codes: G02B 27/0006 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation G02B1/18 takes precedence; cleaning in general B08B
• CPC Class Codes: H04N 23/811 by dust removal, e.g. from surfaces of the image sensor or processing of the image signal output by the electronic image sensor

Abstract

Embodiments provide vehicle camera cleaning systems used for cleaning foreign matter off of a camera lens, including, for example, a water flow nozzle arranged to eject water flow, an air nozzle arranged to eject air, and a central controller used to control the water flow nozzle and air nozzle. In certain embodiments, a plurality of sensing devices are used for sensing the conditions of the camera lens, such as an infrared water drop sensor, a temperature sensor, a camera sensing sensor, and the like. The central controller may determine whether there are water drops, ice, snow, or other foreign matter on the lens based on signals received from the plurality of sensing devices, and may control the air nozzle and the water flow nozzle to clean the camera lens based on the foreign matter present.

Claims

1. A vehicle camera cleaning system, comprising:

an air nozzle arranged proximate to a camera lens, the air nozzle being configured to expel air onto the camera lens; and

a central controller comprising a processing unit including one or more processors, the central controller configured to control the operation of the air nozzle, wherein the central controller is further configured to;

determine whether there are water drops on the camera lens;

in response to determining there are water drops on the camera lens, generate a first instruction to activate the air nozzle to expel air onto the camera lens to remove the water drops;

in response to the air nozzle having expelled air onto the camera lens, determine whether there are residual water drops remaining on the camera lens; and

in response to determining there are residual water drops on the camera lens, performing the following;

determining a temperature of the camera lens;

comparing the temperature of the camera lens with a threshold temperature value;

generating a second instruction to remove the residual water drops using a heated water flow based on a result of the comparison; and

generating a third instruction to activate the air nozzle to expel air onto the camera lens to further remove the residual water drops; and

after the third instruction is generated, determining whether there are residual water residual water drops on the camera lens, and in response to determining there are residual water drops on the camera lens,

generating a fourth instruction to remove the residual water drops using the heated water flow; and

generating a fifth instruction to activate the air nozzle to expel air onto the camera lens to further remove the residual water drops.

2. The vehicle camera cleaning system of claim 1, further comprising:

a foreign matter image sensor communicatively connected to the central controller, the foreign matter image sensor comprising a sensor camera, and wherein the foreign matter image sensor is configured to detect foreign matter on the camera lens using the sensor camera, and to transmit a foreign matter detection signal to the central controller in response to detecting foreign matter on the camera lens; and

, wherein

the central controller is further configured such that the determination whether there are water drops on the camera lens is based on receiving the foreign matter detection signal.

3. The vehicle camera cleaning system of claim 2, wherein the foreign matter image sensor is configured to detect foreign matter on the camera lens based on a determination of whether a set of images captured by the sensor camera is continuous.

4. The vehicle camera cleaning system of claim 2, further comprising:

a heater configured to heat a water flow sprayed by a water flow nozzle;

a temperature sensor communicatively connected to the central controller, the temperature sensor being configured to determine the environment temperature and transmit information indicating the environment temperature to the central controller; and

wherein the central controller is further configured to;

determine whether the environment temperature is lower than the threshold temperature value in response to receiving the environment temperate information; and

generate an activation instruction to activate the heater to heat the water flow sprayed by the water flow nozzle in response to determining the environment temperature is lower than the threshold temperature value.

5. The vehicle camera cleaning system of claim 1, further comprising a water drop sensor comprising an infrared emitter and an infrared receiver, wherein the water drop sensor is configured to generate and transmit water drop sensor information indicating a percentage of infrared rays emitted by the infrared emitter that are received by the infrared receiver and wherein the water drop sensor is arranged on the inner side of the camera lens.

6. The vehicle camera cleaning system of claim 5, wherein

the infrared emitter is configured to emit infrared rays onto the camera lens;

the infrared receiver is configured to receive infrared rays reflected by the camera lens; and

the water drop sensor information is generated by comparing the amount of infrared rays received by the infrared receiver in comparison to the amount of the infrared rays emitted by the infrared emitter.

7. The vehicle camera cleaning system of claim 1, further comprising:

a rubber airbag connected to the air nozzle, such that when the rubber airbag is compressed, air is expelled by the air nozzle.

8. The vehicle camera cleaning system of claim 7, further comprising:

an air blowing motor connected to a first end of a crank, wherein a second end of the crank is connected to a piston configured to compress the rubber airbag,

wherein the air blowing motor is communicatively connected to the central controller and configured to receive activation instructions from the central controller, and wherein upon activation the air blowing motor is configured to drive rotation of the crank, thereby driving the piston back and forth to enable the piston to compress and release the rubber airbag to expel or take in air.

9. The vehicle camera cleaning system of claim 1, further comprising:

a water pump connected with the water flow nozzle; and

a windshield wiper water tank,

wherein the water pump is communicatively connected to the central controller and configured to receive activation instructions from the central controller, and wherein upon activation the water pump is configured to pump water from the windshield wiper water tank to the water flow nozzle.

10. The vehicle camera cleaning system of claim 9, the central controller comprising one or more machine-readable storage medium, storing therein instructions configured to cause the processing unit of the central controller to:

receive an environment temperature of the camera lens from the temperature sensor;

determine whether the environment temperature of the camera lens is lower than a temperature threshold; and

in response to determining that the environment temperature of the camera lens is lower than the temperature threshold, activate the heater to heat a water flowing through the water flow nozzle.

11. The method of claim 1, wherein the vehicle further comprises:

a water pump connected with the water flow nozzle; and

a windshield wiper water tank,

wherein the water pump is communicatively connected to the central controller and configured to receive activation instructions from the central controller, and wherein upon activation the water pump is configured to pump water from the windshield wiper water tank to the water flow nozzle.

12. The method of claim 11, further comprising

receiving an environment temperature of the camera lens from the temperature sensor;

determining whether the environment temperature of the camera lens is lower than a temperature threshold; and

in response to determining that the environment temperature of the camera lens is lower than the temperature threshold, activate the heater to heat a water flowing through the water flow nozzle.

13. A method for a clearing a camera lens in a vehicle, the vehicle comprising an air nozzle arranged proximate to the camera lens, the air nozzle being configured to expel air onto the camera lens, the method being implemented by a central controller, the method comprising:

determining whether there are water drops on the camera lens;

in response to determining there are water drops on the camera lens, generating a first instruction to activate the air nozzle to expel air onto the camera lens to remove the water drops;

in response to the air nozzle having expelled air onto the camera lens, determining whether there are residual water drops remaining on the camera lens; and

in response to determining there are residual water drops on the camera lens, performing the following;

determining a temperature of the camera lens;

comparing the temperature of the camera lens with a threshold temperature value;

generating a second instruction to remove the residual water drops using a heated water flow based on a result of the comparison; and

generating a third instruction to activate the air nozzle to expel air onto the camera lens to further remove the residual water drops; and

after the third instruction is generated, determining whether there are residual water residual water drops on the camera lens, and in response to determining there are residual water drops on the camera lens,

generating a fourth instruction to remove the residual water drops using the heated water flow; and

generating a fifth instruction to activate the air nozzle to expel air onto the camera lens to further remove the residual water drops.

14. The method of claim 13, wherein the vehicle further comprises a foreign matter image sensor communicatively connected to the central controller, the foreign matter image sensor comprising a sensor camera, and wherein the foreign matter image sensor is configured to detect foreign matter on the camera lens using the sensor camera, and to transmit a foreign matter detection signal to the central controller in response to detecting foreign matter on the camera lens, and wherein the determination whether there are water drops on the camera lens is based on receiving the foreign matter detection signal.

15. The method of claim 14, wherein the foreign matter image sensor is configured to detect foreign matter on the camera lens based on a determination of whether a set of images captured by the sensor camera is continuous.

16. The method claim 14, wherein the vehicle further comprises:

a heater configured to heat a water flow sprayed by a water flow nozzle; and

a temperature sensor communicatively connected to the central controller, the temperature sensor being configured to determine the environment temperature and transmit information indicating the environment temperature to the central controller; and

wherein the method further comprises;

determining whether the environment temperature is lower than the threshold temperature value in response to receiving the environment temperate information; and

generating an activation instruction to activate the heater to heat the water flow sprayed by the water flow nozzle in response to determining the environment temperature is lower than the threshold temperature value.

17. The method of claim 13, wherein the vehicle further comprises a water drop sensor comprising an infrared emitter and an infrared receiver, wherein the water drop sensor is configured to generate and transmit water drop sensor information indicating a percentage of infrared rays emitted by the infrared emitter that are received by the infrared receiver and wherein the water drop sensor is arranged on the inner side of the camera lens.

18. The method of claim 17, wherein:

the infrared emitter is configured to emit infrared rays onto the camera lens;

the infrared receiver is configured to receive infrared rays reflected by the camera lens; and

the water drop sensor information is generated by comparing the amount of infrared rays received by the infrared receiver in comparison to the amount of the infrared rays emitted by the infrared emitter.

19. The method of claim 13, wherein the vehicle further comprises:

a rubber airbag connected to the air nozzle, such that when the rubber airbag is compressed, air is expelled by the air nozzle.

20. The method of claim 19, wherein the vehicle further comprises:

an air blowing motor connected to a first end of a crank, wherein a second end of the crank is connected to a piston configured to compress the rubber airbag,

wherein the air blowing motor is communicatively connected to the central controller and configured to receive activation instructions from the central controller, and wherein upon activation the air blowing motor is configured to drive rotation of the crank, thereby driving the piston back and forth to enable the piston to compress and release the rubber airbag to expel or take in air.