Electric vehicle pick-up position control

• US 5,595,271 A
• Filed: 08/07/1995
• Issued: 01/21/1997
• Est. Priority Date: 08/07/1995
• Status: Expired due to Fees

• Current Assignee: Ling-Yuan Tseng
• Original Assignee: Ling-Yuan Tseng
• Inventors: Tseng, Ling-Yuan
• Primary Examiner(s): Merritt, Karen B.
• Assistant Examiner(s): LOWE, SCOTT
• Application Number:
  US08/511,991
• Time in Patent Office: 533 Days
• Field of Search: 191/3, 191/4, 191/6, 191/10, 191/14, 191/15, 191/22 C, 180/2.1, 104/288, 104/289, 104/291, 104/293, 104/304, 307/9.1, 307/10.1
• US Class Current: 191/4
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/37 using optical position determination, e.g. using cameras
• CPC Class Codes: B60L 53/38 specially adapted for charging by inductive energy transfer
• CPC Class Codes: B60L 8/003 Converting light into electric energy, e.g. by using photo-voltaic systems
• CPC Class Codes: B60M 7/006 for auto-scooters or the like, the power being supplied over a broad surface
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

In an electrically powered vehicle having an inductive pick-up configured to couple electrical power from a series of aligned and spaced-apart charging pads associated with a road surface, methods and apparatus are disclosed for controlling the lateral positioning of the pick-up as well as the gap between the pick-up and the charging pads as the vehicle moves along a road surface. Control of the lateral positioning and gap may be provided either separately or in combination. In the preferred embodiment, the pick-up is pivotally connected to the vehicle through an extension arm, the pivotal connection including a first position wherein vertical positioning of the pick-up is power controlled toward and away from the road surface, and a second position wherein airflow past the pick-up maintains the positioning of the pick-up relative to the road surface. In terms of lateral positioning, the apparatus further includes a camera capable of sensing the charging pads as the vehicle moves, and apparatus in operative communication with the camera for moving the pick-up side-to-side as the vehicle moves in response to the position of the charging pads as sensed by the camera.

Claims

1. An inductive pick-up apparatus for an electrically powered vehicle comprising:

an inductive pick-up configurated for use with a series of aligned and spaced-apart charging pads associated with a road surface; and

a device for automatically controlling a relative position between the pick-up and the charging pads while the vehicle moves along the road surface, the device including an extension arm connected to the vehicle, the pick-up being pivotally attached to the extension arm, and wherein the shape of the pick-up enables the pick-up to maintain a consistent air gap between the pick-up and the charging pads solely due to the airflow acting on the pick-up, while said device is in a first mode of operation.

2. The apparatus of claim 1, wherein the pivotal facilitates a second mode of operation of the device wherein the vertical positioning of the pick-up is power controlled.

3. The apparatus of claim 1, wherein the pick-up is airfoil-shaped.

4. The apparatus of claim 3, wherein the airfoil-shaped pick-up includes a hollow cavity with one or more air intakes and with one or more air output ports, the output ports expelling air so as to create a pressure operative to help maintain the air gap.

5. The apparatus of claim 1, further including means for controlling the lateral positioning of the pick-up relative to the vehicle as the vehicle moves along the road surface.

6. The apparatus of claim 5, wherein the means for controlling the lateral positioning of the pick-up relative to the vehicle as the vehicle moves along the road surface further includes:

a camera mounted at a forward end of the vehicle, the camera being capable of sensing the charging pads as the vehicle moves; and

means in operative communication with the camera for moving the pick-up from side-to-side, relative to the vehicle, in response to the position of the charging pads as sensed by the camera.

7. The apparatus of claim 6, wherein the pick-up and vehicle both having a longitudinal axis, and the means for moving the pick-up from side-to-side includes means for maintaining a parallel relationship between the two axes as the pick-up is moved side-to-side.

8. In an electrically powered vehicle having an inductive pick-up configured for use with a series of aligned and spaced-apart charging pads associated with a road surface, the improvement comprising:

an apparatus for controlling the lateral positioning of the pick-up relative to the vehicle as the vehicle moves along the road surface, the apparatus including;

a camera mounted at a forward end of the vehicle, the camera being capable of sensing the charging pads as the vehicle moves; and

means in operative communication with the camera for moving the pick-up side-to-side, relative to the vehicle, in response to the position of the charging pads as sensed by the camera.

9. The improvement of claim 8, wherein the pick-up and vehicle both have a longitudinal axis, and wherein the means for moving the pick-up from side-to-side includes means for maintaining a parallel relationship between the two axes as the pick-up is moved side-to-side.

10. In an electrically powered vehicle having an inductive pick-up configured to couple electrical power from a series of aligned and spaced-apart charging pads associated with a road surface, the improvement comprising:

lateral positioning means for automatically controlling the lateral positioning of the pick-up relative to the vehicle as the vehicle moves along the road surface; and

vertical positioning means for automatically controlling a gap between the pick-up and the charging pads as the vehicle moves along the road surface.

11. The improvement of claim 10, further including pattern-recognition electronics on-board the vehicle which sense images of the charging pads as the vehicle moves along the road surface and which generate signals in response to a position of the images sensed, and wherein the lateral positioning means is controlled by the signals and moves the pick-up from side to side with respect to the vehicle in accordance with the signals.

12. The improvement of claim 10, wherein the vertical positioning means uses air flow, which contacts the pick-up as the vehicle moves along the road surface, to automatically control the gap between the pick-up and the charging pads.

13. A system for charging a battery on-board a vehicle as it travels along a road surface, comprising:

a series of aligned and spaced-apart charging pads associated with the road surface;

an inductive pick-up associated with the vehicle to couple electrical power from the pads to the battery; and

apparatus on-board the vehicle for controlling the physical relationship between the pick-up and the charging pads as the vehicle moves to increase coupling efficiency therebetween, including means for sensing the position of the charging pads and outputting a signal representative of the relative alignment between the charging pads and the inductive pick-up; and

means for orienting the inductive pick-up with respect to the charging pads in response to the signal.

14. The system of claim 13, wherein the means for sensing the position of the charging pads includes a camera mounted at a forward end of the vehicle having a field of view with which to visually perceive one or more oncoming charging pads.

15. The system of claim 14, further including a power-adjustable mount for the camera operative to modify the field of view as a function of the relative alignment between the charging pads and the inductive pick-up.

16. The system of claim 14, further including means for improving the ability of the camera to visually perceive one or more oncoming charging pads.

17. The system of claim 16, wherein the means for improving the ability of the camera to visually perceive one or more oncoming charging pads includes the addition of visual indicia to enhance the visibility of the pads relative to the surrounding road surface.

18. The system of claim 17, wherein the visual indicia includes reflective paint.

19. The system of claim 16, wherein the means for improving the ability of the camera to visually perceive one or more oncoming charging pads includes means for heating the charging pads and a camera which senses in the infrared region of the spectrum.

20. The system of claim 19, wherein the means for heating the charging pads are electrically powered.

21. The system of claim 19, wherein the means for heating the charging pads are solar powered.