Wading vehicle control system

Patent metadata

Field	Value
Publication number	US-9227479-B2
Application number	US-201214004937-A
Country	US
Kind code	B2
Filing date	Mar 15, 2012
Priority date	Mar 15, 2011
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A vehicle having a system for determining that there is a possibility that the vehicle has or is about to enter water at a vehicle wading depth. In response to determining that there is a possibility that the vehicle has or is about to enter water at a vehicle wading depth, the system is configured to implement one or more vehicle control strategies. The system comprises at least one remote sensor configured to remotely detect the presence of water about or ahead of the vehicle.

First claim

The invention claimed is:

1. A system for determining that there is a possibility that a land vehicle is about to travel through water at a vehicle wading depth wherein an exhaust tailpipe of the vehicle is submerged in water, the system comprising:
at least one remote sensor configured to remotely detect the presence of water about or ahead of the vehicle at a control threshold depth, wherein said control threshold depth is below said wading depth and said exhaust tailpipe is not submerged in water at said control threshold depth; and
a controller configured to, in response to said determining, implement one or more vehicle control strategies in dependence on said detection of the presence of water at said control threshold depth.

2. A system according to claim 1 wherein determining that there is a possibility that a land vehicle is about to travel through water at said vehicle wading depth comprises the system being configured to determine one or more of: a possibility that the vehicle is about to enter water of at least 200 mm in depth and that the vehicle body is about to be at least partially immersed in water; and in response to said determining the system is configured to implement one or more vehicle control strategies before the vehicle enters into water of at least 200 mm in depth and/or before the vehicle body is at least partially immersed in water.

3. A system according to claim 1 wherein said at least one remote sensor(s) comprises at least one ultrasonic transducer sensor.

4. A system according to claim 1 wherein the at least one remote sensor is configured to remotely detect the presence of water, by the sensor emitting a signal and by the same or another sensor receiving a reflection of that signal, and by the system being configured to analyze the reflected signal.

5. A system according to claim 4 wherein the system is configured to analyze the reflected signal by interrogating the amplitude and/or phase of the reflected signal and the presence of water is determined by the system identifying a defined change in the amplitude and/or phase of the reflected signal.

6. A system according to claim 5 wherein the defined change is indicative of a change in the dielectric constant of the medium from which the emitted signal was reflected.

7. A system according to claim 1 wherein the control threshold depth is between 100 mm and 200 mm.

8. A system according to claim 1 wherein the at least one remote sensor is configured to determine one of a depth of the water relative to the vehicle and an absolute depth of the water.

9. A system according to any claim 1 wherein said one or more vehicle control strategies comprises any one or more of:
(i) suspending a stop/start function of a powertrain to prevent automatic shut down of a combustion engine;
(ii) activating a stopped combustion engine;
(iii) preparing an actuator of a ride height adjustment mechanism so that ride height can be adjusted;
(iv) increasing the ride height of the vehicle;
(v) initiating 4WD transmission mode;
(vi) selecting low-range on a transfer box; and
(vii) preparing the vehicle for preventing ingress of water via the vehicle tail pipe by increasing the exhaust gas pressure or flow rate in the tail pipe to mitigate against or prevent ingress of water via the tail pipe.

10. A vehicle comprising a system according to claim 9 .

11. A vehicle according to claim 10 wherein the system comprises at least two remote sensors disposed on either side of the vehicle.

12. A vehicle according to claim 11 wherein the system comprises a first remote sensor located on a left side mirror of the vehicle and a second remote sensor located on a right side mirror of the vehicle.

13. A system as claimed in claim 11 , wherein the at least two remote sensors are disposed on a common lateral axis of the vehicle.

14. A system according to claim 1 wherein the control strategy comprises preparing the vehicle for preventing ingress of water via the vehicle tail pipe by any one or more of: increasing the exhaust gas pressure by increasing engine speed; activating a mechanism to increase the height of the tailpipe exhaust outlet; and switching a hybrid vehicle to electric drive mode only and sealing the tailpipe exhaust outlet.

15. A vehicle comprising a system according to claim 1 .

16. A system as claimed in claim 1 , further comprising at least one contact sensor configured to detect the presence of water by the sensor being in contact with the water.

17. A system as claimed in claim 1 , wherein the control threshold depth is at least 20 mm below the opening of the exhaust tailpipe outlet.

18. A system for controlling a land vehicle having a combustion engine, the system comprising:
at least one sensor located on each of two side mirrors arranged on opposite sides of a vehicle, said sensors configured to remotely and/or directly detect the presence of water substantially below and/or about the sensor at a control threshold depth, wherein said control threshold depth is a water depth below an exhaust tailpipe of the vehicle; and
a controller configured to, in dependence on said detection of the presence of water at said control threshold depth, suspend a stop/start function of the vehicle so as to prevent automatic shut down of the combustion engine.

19. A vehicle comprising two side mirrors, a combustion engine, and a system according to claim 18 .

20. A method of determining that there is a possibility that the vehicle is about to travel through water at a vehicle wading depth, wherein an exhaust tailpipe of the vehicle is submerged in water, and controlling a vehicle in response thereto, the method comprising:
(i) using at least one remote sensor configured to remotely detect the presence of water about or ahead of the vehicle at a control threshold depth wherein said control threshold depth is below the wading depth and said exhaust tailpipe is not submerged in water at said control threshold depth;
and in response thereto:
(ii) determining that there is a possibility that the vehicle is about to enter water at said vehicle wading depth; and
(iii) implementing one or more vehicle control strategies.

21. A method according to claim 20 wherein when it is determined that there is a possibility that the vehicle is about to enter water at said vehicle wading depth, the step of implementing one or more vehicle control strategies is carried out before the vehicle enters water at said wading depth.

22. A method according to claim 20 wherein said one or more vehicle control strategies comprises any one or more of:
(i) suspending a stop/start function of a powertrain to prevent automatic shut down of a combustion engine;
(ii) activating a stopped combustion engine;
(iii) preparing an actuator of a ride height adjustment mechanism so that ride height can be adjusted;
(iv) increasing the ride height of the vehicle;
(v) initiating 4WD transmission mode;
(vi) selecting low-range on a transfer box; and
(vii) preparing the vehicle for preventing ingress of water via the vehicle tail pipe by increasing the exhaust gas pressure or flow rate in the tail pipe to mitigate against or prevent ingress of water via the tail pipe.

23. A non-transitory computer readable medium having a computer program stored thereon for implementing the method of claim 20 .

Assignees

• Clarke Nigel
• Hoare Edward
• Tran Thuy-Yung
• Jaguar Land Rover Ltd

Inventors

• Clarke Nigel
• Hoare Edward
• Tran Thuy-Yung

Classifications

• B60W10/111

  with separate change-speed gear trains arranged in series · CPC title

• G01F23/2965

  Measuring attenuation of transmitted waves · CPC title

• B60W2552/00

  Input parameters relating to infrastructure · CPC title

• F02N11/0837

  Environmental conditions thereof, e.g. traffic, weather or road conditions · CPC title

• G01S7/539

  using analysis of echo signal for target characterisation; Target signature; Target cross-section · CPC title