Control for passive wiper system

Patent metadata

Field	Value
Publication number	US-9855925-B2
Application number	US-201414529920-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	Oct 31, 2014
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A system includes a dome, a wiper assembly, a position sensor and a control device. The wiper assembly includes a wiper blade configured to rotate around the dome. The position sensor may be configured to send a signal to a control device when a wiper blade passes the position sensor. The control device may include one or more processors configured to receive the signal from the position sensor and determine a location of the wiper blade relative to the dome based on the received signal.

First claim

The invention claimed is:

1. A method of determining a position of a wiper blade as the wiper blade rotates around a dome, the method comprising:
receiving, by one or more processors, a signal from a position sensor indicating detection of the wiper blade at a first position relative to the dome;
accessing information, by the one or more processors, about a speed of the wiper blade as the wiper blade rotates around the base of the dome;
determining, by the one or more processors, a second position of the wiper blade relative to the dome based upon the speed;
based on the determined second position, causing, by the one or more processors, fluid to be dispensed through a spray nozzle when the wiper blade is at a pre-determined position.

2. The method of claim 1 , wherein the signal is a first signal, the method further comprising:
receiving, by the one or more processors, a second signal from a second position sensor indicating a position of a drive motor relative to the wiper blade; and
determining, by the one or more processors, the second position of the wiper blade based upon the second signal and the speed of the wiper blade.

3. The method of claim 1 further comprising:
accessing information, by the one or more processors, about a position of a spray nozzle relative to the dome;
accessing information, by the one or more processors, about the pre-determined position of the wiper blade relative to the spray nozzle; and
determining, by the one or more processors, when the wiper blade is at the pre-determined position based upon the position of the spray nozzle relative to a current position of the wiper blade.

4. The method of claim 1 further comprising activating, by the one or more processors, a fluid dispensing system, including the spray nozzle in order to cause the fluid to be dispensed through the spray nozzle.

5. The method of claim 1 , wherein the spray nozzle is a plurality of spray nozzles, including a first spray nozzle and a second spray nozzle, and the method further comprises:
accessing information about a first pre-determined position of the wiper blade relative to the first spray nozzle and a second pre-determined position of the wiper blade relative to the second spray nozzle;
causing, by the one or more processors, fluid to be dispensed through the first spray nozzle when the wiper blade is at the first pre-determined position; and
causing, by the one or more processors, fluid to be dispensed through the second spray nozzle when the wiper blade is at the second pre-determined position.

6. The method of claim 2 , further comprising controlling, by the one or more processors, speed of the wiper blade.

7. A method of controlling movement of a wiper blade assembly configured to move 360 degrees about a dome surface, the wiper blade assembly including a wiper blade, the method comprising:
receiving, by one or more processors, a signal indicating that optical deterrents are present on the dome surface;
in response to receiving the signal, causing, by the one or more processors, the wiper blade assembly to move in a first direction around the dome surface by rotating a bearing ring to which the wiper blade is attached in a first direction around the dome surface and thereby moving the wiper blade from a stowed condition to a deployed condition of the wiper blade, wherein the bearing ring extends around the dome surface; and
causing, by the one or more processors, the wiper blade assembly to move in a second direction around the dome surface by rotating the bearing ring in the second direction and thereby moving the wiper blade from the deployed condition to the stowed condition, and wherein the second direction is opposite of the first direction.

8. The method of claim 7 , wherein the first direction is a clockwise direction and the second direction is a counterclockwise direction.

9. The method of claim 7 , further comprising adjusting, by the one or more processors, a speed that the wiper blade assembly rotates about the dome surface.

10. The method of claim 7 , wherein the signal is a first signal, the method further comprising:
receiving, by the one or more processors, a second signal indicating that optical deterrents are cleared from the dome surface; and
wherein the one or more processors are further configured to causing the wiper blade assembly to move in the second direction in response to receiving the second signal.

11. The method of claim 7 , wherein rotating the bearing ring in a first direction includes rotating a drive motor in a third direction that corresponds to the first direction.

12. A system of determining a position of a wiper blade as the wiper blade rotates around a dome, the system comprising:
a position sensor;
the dome; and
one or more processors configured to:
receive a signal from the position sensor indicating detection of the wiper blade at a first position relative to the dome;
access information about a speed of the wiper blade as the wiper blade rotates around the base of the dome; and
determine a second position of the wiper blade relative to the dome based upon the speed; and
based on the determined second position, cause fluid to be dispensed through a spray nozzle when the wiper blade is at a pre-determined position.

13. The system of claim 12 , wherein the signal is a first signal, the one or more processors are further configured to:
receive a second signal from a second position sensor indicating a position of a drive motor relative to the wiper blade; and
determine the second position of the wiper blade based upon the second signal and the speed of the wiper blade.

14. The system of claim 12 , wherein the one or more processors are further configured to:
access information about a position of a spray nozzle relative to the dome;
access information about the pre-determined position of the wiper blade relative to the spray nozzle; and
determine when the wiper blade is at the pre-determined position based upon the position of the spray nozzle relative to a current position of the wiper blade.

15. The system of claim 12 , wherein the one or more processors are further configured to activate a fluid dispensing system, including the spray nozzle in order to cause fluid to be dispensed through the spray nozzle.

16. The system of claim 12 , wherein the spray nozzle is a plurality of spray nozzles, including a first spray nozzle and a second spray nozzle and the one or more processors are further configured to:
access information about a first pre-determined position of the wiper blade relative to the first spray nozzle and a second pre-determined position of the wiper blade relative to the second spray nozzle;
cause fluid to be dispensed through the first spray nozzle when the wiper blade is at the first pre-determined position; and
cause fluid to be dispensed through the second spray nozzle when the wiper blade is at the second pre-determined position.

17. The system of claim 12 , wherein the one or more processors are further configured to control the speed of the wiper blade.

18. The system of claim 12 further comprising a vehicle, wherein the dome is attached to the vehicle.

19. The system of claim 18 , wherein the dome is configured as a housing for at least one sensor configured to detect objects in an external environment of the vehicle.

Assignees

• Waymo Llc

Inventors

• Doorley Graham
• Karplus Paul Thomas Hansen
• Avram Peter

Classifications

• B08B1/34

  rotating about an axis parallel to the surface · CPC title

• B08B1/16

  Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers · CPC title

• B60S1/56 Primary

  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 title

• B60S1/08 Primary

  electrically driven {(conjoint control of windscreen wiper motor and liquid supply of windscreen washer B60S1/482; conjoint control of windscreen wiper motor and means for cleaning parts o parts other than windscreens or front windows B60S1/56, B60S1/58, B60S1/606)} · CPC title

• B08B1/00

  Cleaning by methods involving the use of tools (cleaning hollow articles by methods or apparatus specially adapted thereto B08B9/00) · CPC title