Vehicle camera cleaning system

Patent metadata

Field	Value
Publication number	US-9604601-B2
Application number	US-201514967366-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Mar 16, 2015
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

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.

First claim

What is claimed is:

1. A vehicle camera cleaning system, comprising:
an air nozzle arranged proximate to a camera lens of the camera cleaning system, the air nozzle being configured to expel air onto the camera lens;
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;
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:
receive the water drop sensor information from the water drop sensor;
determine whether there are water drops on the camera lens based on the water drop sensor information; and
in response to determining there are water drops on the camera lens, generate an instruction to activate the air nozzle to expel air onto the camera lens to remove the 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 such that the determination whether there are water drops on the camera lens is further based on receiving the foreign matter detection signal.

3. The vehicle camera cleaning system of claim 2 , wherein the water drop sensor is arranged on the inner side of the camera lens.

4. The vehicle camera cleaning system of claim 3 , wherein the water drop sensor is configured such that:
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.

5. 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.

6. The vehicle camera cleaning system of claim 1 , further comprising:
a heater configured to heat a water flow;
a temperature sensor communicatively connected to the central controller, the temperature sensor being configured to generate environment temperature information indicating an environment temperature of the camera lens and transmit the environment temperature information to the central controller; and wherein the central controller is further configured to:
determine whether the environment temperature is lower than a threshold temperature value in response to receiving the environment temperate information; and
generate an activation instruction to activate the heater in response to determining the environment temperature is lower than a threshold temperature value.

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 heater communicatively connected to the central controller, the heater communicatively connected to the central controller and configured to receive activation instructions from the central controller.

10. A method of using a vehicle camera cleaning system to clean a camera lens in the vehicle, the camera cleaning system comprising an air nozzle arranged proximate to the camera lens, the air nozzle being configured to expel air onto the camera lens, a water drop sensor comprising an infrared emitter and an infrared receiver, the water drop sensor being 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 a central controller comprising a processing unit including one or more processors, the central controller configured to control the operation of the air nozzle, the method comprising:
receiving, by the controller of a vehicle camera cleaning system, the water drop sensor information from the water drop sensor;
determining, by the controller of the vehicle camera cleaning system, whether there are water drops on the camera lens based on the water drop sensor information;
in response to determining there are water drops on the camera lens, generating an instruction to activate the air nozzle to expel air onto the camera lens to remove the water drops.

11. The method of claim 10 , wherein the vehicle camera cleaning system 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 further based on receiving the foreign matter detection signal.

12. The method of claim 10 , wherein determining whether there are water drops on the camera lens comprises:
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.

13. The method of claim 10 , wherein detecting foreign matter on the camera lens, by the foreign matter image sensor, is based on a determination of whether a set of images captured by the sensor camera is continuous.

14. The method of claim 13 , wherein the vehicle cleaning system further comprises a heater configured to heat a water flow, and a temperature sensor communicatively connected to the central controller, the temperature sensor being configured to generate environment temperature information indicating an environment temperature of the camera lens and transmit the environment temperature information to the central controller, and wherein the method further comprises:
determining, by the controller, whether the environment temperature is lower than a threshold temperature value in response to receiving the environment temperate information; and
generating, by the controller, an activation instruction to activate the heater in response to determining the environment temperature is lower than a threshold temperature value.

Assignees

• Thunder Power Hong Kong Ltd

Inventors

• Hsiao Jen-Chieh
• Wu Tai-Te
• Chen Yen-An

Classifications

• H04N23/811

  by dust removal, e.g. from surfaces of the image sensor or processing of the image signal output by the electronic image sensor · CPC title

• B60S1/52

  Arrangement of nozzles; {Liquid spreading means}(nozzles per se B05B) · CPC title

• G02B27/0006

  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 title

• B60S1/566 Primary

  including wiping devices (B60S1/563, B60S1/583 take precedence) · CPC title

• B08B5/02

  Cleaning by the force of jets, e.g. blowing-out cavities {(airguns or nozzles per se B05B1/005)} · CPC title