Patent Application
20190381892
This disclosure generally relates to a positioning system, and more particularly relates to vehicle positioning system for directing an electric vehicle into a charging-zone.
The present invention will now be described, by way of example with reference to the accompanying drawings, in which:
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the various described embodiments. However, it will be apparent to one of ordinary skill in the art that the various described embodiments may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and networks have not been described in detail so as not to unnecessarily obscure aspects of the embodiments.
The system 10 includes a positioning-device 16 that determines a position 18 of the vehicle 12 moving proximate the power-transfer-zone 14. In the example illustrated in
The power-transfer-zone 14 includes the base-coil disposed within the power-transfer-zone 14 configured to emit a magnetic-field in response to electrical power applied to the base-coil. The base-coil (also referred to as a ground-coil or ground-assembly), may be any base-coil suitable for transferring energy to the vehicle 12 and preferably conforms to an SAE Recommended Practice J2954 NOV2017 specification. In general, a strength of the magnetic-field increases with increasing electrical power applied to the base-coil. Additionally, the strength of the magnetic-field is greatest proximate to the base-coil, and generally varies inversely with the third-power of distance away from the base-coil. An exposed base-coil (i.e. the base-coil not covered or not overlaid by the vehicle 12) is typically limited to a magnetic-field with a maximum strength of 15 microteslas (15 μT), based on an International Commission on Non-Ionizing Radiation Protection 2010 (ICNIRP 2010) safety limit for implanted electronic pacemakers. Prior art power transfer systems typically require the vehicle-coil to be aligned (i.e. positioned above, etc.) with the base-coil for optimum power transfer before increasing the strength of the magnetic-field of the base-coil. This requirement to limit the strength of the magnetic-field results in the vehicle-coil initially coupling with base-coil for short-range alignment at a distance less than approximately 300 mm, due to the relatively low strength of magnetic-field of 15 μT. This relatively short range (i.e., 300 mm) leaves little distance for maneuvering the vehicle 12 into and/or within the power-transfer-zone 14. By increasing a guidance-distance 22 for the vehicle 12 beyond the boundary 20 of the power-transfer-zone 14, the system 10 enables the vehicle 12 to maneuver for optimum alignment between the base-coil and the vehicle-coil.
The positioning-device 16 includes a first-transceiver 24 transmitting signals 26 indicative of the position 18 of the vehicle 12 relative to the power-transfer-zone 14. That is, the first-transceiver 24, which is capable of both transmitting and receiving, transmits signals 26 wirelessly (e.g., using IEEE 802.11, cellular, dedicated short range communication (DSRC), BLUETOOTH®, and/or infrared, etc. protocols) to the vehicle 12 based on the information received from the positioning-device 16. In the example illustrated in
The system 10 also includes a second-transceiver 28 installed on the vehicle 12 that receives the signals 26 from the first-transceiver 24. The second-transceiver 28 is also capable of both transmitting and receiving signals 26 wirelessly.
The system 10 also includes one or more controller-circuits 30 in communication with the positioning-device 16, the first-transceiver 24, the second-transceiver 28, and the vehicle 12. As illustrated in
The positioning-device 16 associates 32 with the vehicle 12 when the second-transceiver 28 is within a sensing-range 34 of the first-transceiver 24. As used herein, the term “associates” includes the positioning-device 16 establishing an exclusive bi-directional communication with the vehicle 12 via the first-transceiver 24 and the second-transceiver 28 when the second-transceiver 28 is within the sensing-range 34 of the first-transceiver 24. An IP address of the charging-station, and/or other information related to the charging-station, may be communicated to the vehicle 12 once the positioning-device 16 associates 32 with the vehicle 12. The sensing-range 34 varies with the type of signal 26 transmitted, and for the infrared signal 26 is up to about 20 meters (m) along a line-of-sight, and may be greater than 20 m for other wireless signals 26 (e.g. IEEE 802.11, cellular, DSRC, BLUETOOTH®, etc.).
Step 102, DETERMINE POSITION, includes determining a position 18 of a vehicle 12 moving proximate a power-transfer-zone 14 with a positioning-device 16, as described above. The positioning-device 16 includes a first-transceiver 24 capable of both transmitting and receiving signals 26 wirelessly as described above.
Step 104, TRANSMIT SIGNALS, includes wirelessly transmitting signals 26 indicative of the position 18 of the vehicle 12 relative to the power-transfer-zone 14 with the first-transceiver 24. In the example illustrated in
Step 106, RECEIVE SIGNALS, includes receiving the signals 26 from the first-transceiver 24 with a second-transceiver 28 installed on the vehicle 12, as described above.
Step 108, ASSOCIATE VEHICLE, includes associating 32 the positioning-device 16 with the vehicle 12, with one or more controller-circuits 30 in communication with the positioning-device 16, the first-transceiver 24, the second-transceiver 28, and the vehicle 12, when the second-transceiver 28 is within a sensing-range 34 of the first-transceiver 24 as described above. Associating 32 includes the positioning-device 16 establishing an exclusive bi-directional communication with the vehicle 12 via the first-transceiver 24 and the second-transceiver 28 when the second-transceiver 28 is within the sensing-range 34 of the first-transceiver 24.
Step 110, DIRECT VEHICLE, includes directing 36 the vehicle 12 into the power-transfer-zone 14. In one embodiment, the system 10 further includes vehicle-controls 38 in communication with the one or more controller-circuits 30, and the one or more controller-circuits 30 steer the vehicle 12 into the power-transfer-zone 14. In another embodiment, the system 10 further includes a visual-display 40 installed in the vehicle 12 in communication with the one or more controller-circuits 30, and the one or more controller-circuits 30 displays the directions 36 to an operator (not shown) of the vehicle 12 on the visual-display 40.
Accordingly, a positioning system 10 (the system 10), and a method 100 of operating the system 10 are provided. The system 10 is an improvement over prior art positioning systems because the system 10 increases the guidance-distance 22 for the vehicle 12 beyond the boundary 20 of the power-transfer-zone 14.
While this invention has been described in terms of the preferred embodiments thereof, it is not intended to be so limited, but rather only to the extent set forth in the claims that follow. “One or more” includes a function being performed by one element, a function being performed by more than one element, e.g., in a distributed fashion, several functions being performed by one element, several functions being performed by several elements, or any combination of the above. It will also be understood that, although the terms first, second, etc. are, in some instances, used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first contact could be termed a second contact, and, similarly, a second contact could be termed a first contact, without departing from the scope of the various described embodiments. The first contact and the second contact are both contacts, but they are not the same contact. The terminology used in the description of the various described embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various described embodiments and the appended claims, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term “and/or” as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms “includes,” “including,” “comprises,” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “if” is, optionally, construed to mean “when” or “upon” or “in response to determining” or “in response to detecting,” depending on the context. Similarly, the phrase “if it is determined” or “if [a stated condition or event] is detected” is, optionally, construed to mean “upon determining” or “in response to determining” or “upon detecting [the stated condition or event]” or “in response to detecting [the stated condition or event],”depending on the context. Directional terms such as top, bottom, upper, lower, left, right, front, rear, etc. do not denote any particular orientation, but rather these directional terms are used to distinguish one element from another and establish a relationship between the various elements.
