Driving assistance system with short-distance ranging

Patent metadata

Field	Value
Publication number	US-10328843-B2
Application number	US-201815940674-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Apr 12, 2017
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A driving assistance system for a vehicle has a longer-distance sensor device for determining longer-distance information between a vehicle and an obstacle, and a shorter-distance sensor device for determining shorter-distance information between the vehicle and the obstacle. A dual-mode light emitting diode (LED module) can selectively emit both visible light and infrared light, and is part of the vehicle's driving-lights system, such as a headlight and/or a reversing light. The LED module emits infrared light when operating as part of the shorter-distance sensor device and an infrared receiver detects the reflected infrared light for distance determination. The longer-distance sensor device uses ultrasonic waves to determine distance information, and when it indicates that the distance has fallen below a threshold distance (below which the longer-distance sensing device is not reliable), a controller activates the shorter-distance sensing device.

First claim

What is claimed is:

1. Vehicle-mounted ranging apparatus comprising:
a driving-light having a light emitting diode (LED) module operable to emit visible light for vehicle exterior lighting, and to emit infrared light;
an infrared receiver;
a longer-distance sensing unit operable to detect a length of a parking gap; and
a controller directing, when the length of the parking gap is above a minimum maneuvering length dependent on a length of the vehicle and below a short-distance maneuvering length, the LED module to emit infrared light and determining distance to an object adjacent to the parking gap from infrared light reflected from the object and detected by the infrared receiver.

2. The apparatus of claim 1 , further wherein:
the longer-distance sensing unit comprises an ultrasonic sensor device.

3. The apparatus of claim 1 , wherein the driving-light is a headlight.

4. The apparatus of claim 1 , wherein the driving-light is a reversing light.

5. The apparatus of claim 1 , wherein the infrared receiver comprises a photosensor operative to control an automatic driving light circuit.

6. A method for operating a driving assistance system of a motor vehicle, comprising:
operating a dual-mode light emitting diode (LED) module to emit visible light as part of a driving-light system of the vehicle;
monitoring a distance between the vehicle and an object using a longer-distance sensing unit; and
operating a controller to, in response to a determination that the distance has fallen below a threshold value in a range of 20 cm to 40 cm, activate the LED module to emit infrared light, and activate a receiver to detect infrared light reflected from the object, and determine distance to the object therefrom.

7. The method of claim 6 , wherein the longer-distance sensing unit utilizes ultrasonic waves to measure distance.

8. The method of claim 6 , further comprising
in response to a determination that the vehicle is executing a parking maneuver, operating the controller to activate the LED module to emit infrared light, and activate the receiver to detect infrared light reflected from the object, and determine distance to the object therefrom.

9. The method of claim 8 , further comprising:
operating the longer-distance sensing unit to detect a length of a parking gap; and
activating the LED module to emit infrared light and the receiver to receive reflected infrared light if the length of the parking gap is above a minimum maneuvering length dependent on a length of the vehicle, and below a short-distance maneuvering length.

10. A method for operating a driving assistance system of a motor vehicle, comprising:
operating a dual-mode light emitting diode (LED) module to emit visible light as part of a driving-light system of the vehicle;
operating a longer-distance sensing unit to monitor a distance between the vehicle and an object, and to detect a length of a parking gap; and
operating a controller to, in response to a determination that a) the distance has fallen below a threshold value, b) the vehicle is executing a parking maneuver, and c) the length of the parking gap is above a minimum maneuvering length dependent on a length of the vehicle and below a short-distance maneuvering length, activate the LED module to emit infrared light, and activate a receiver to detect infrared light reflected from the object, and determine distance to the object therefrom.

11. The method of claim 10 , wherein the dual-mode LED is part of a headlight.

12. The method of claim 10 , wherein the dual-mode LED is part of a reversing light.

13. The method of claim 10 , wherein the infrared receiver comprises a photosensor providing an input to an automatic driving light circuit.

14. The method of claim 10 , wherein the longer-distance sensing unit comprises an ultrasonic sensor device.

15. A method for operating a driving assistance system of a motor vehicle, comprising:
operating a dual-mode light emitting diode (LED) module to emit visible light as part of a driving-light system of the vehicle;
operating a longer-distance sensing unit to detect a length of a parking gap; and
operating a controller to, in response to a determination that a) the vehicle is executing a parking maneuver, and b) the length of the parking gap is above a minimum maneuvering length dependent on a length of the vehicle and below a short-distance maneuvering length, activate the LED module to emit infrared light, and activate a receiver to detect infrared light reflected from an object adjacent to the parking gap, and utilizing distance information from the receiver to complete the parking maneuver.

Assignees

• Ford Global Tech Llc

Inventors

• Stefan Frederic
• Arndt Christoph
• Gussen Uwe

Classifications

• G01S15/931

  of land vehicles · CPC title

• B60Q1/0023 Primary

  the element being a sensor, e.g. distance sensor, camera · CPC title

• G01S17/86

  Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders · CPC title

• B60Q1/1423

  Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic · CPC title

• G01S2015/933

  for measuring the dimensions of the parking space when driving past · CPC title