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Wireless Power Transfer for Light-Duty Plug-In/ Electric Vehicles and Alignment Methodology
- Ground Vehicle Standard
- J2954_201605
- Issued
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
SAE TIR J2954 establishes an industry-wide specification guideline that defines acceptable criteria for interoperability, electromagnetic compatibility, minimum performance, safety and testing for wireless charging of light duty electric and plug-in electric vehicles. The current version addresses unidirectional charging, from grid to vehicle, but bidirectional energy transfer may be evaluated for a future standard. The specification defines various charging levels that are based on the levels defined for SAE J1772 conductive AC charge levels 1, 2 and 3, with some variations. A standard for wireless power transfer (WPT) based on these charge levels will enable selection of a charging rate based on vehicle requirements, thus allowing for better vehicle packaging, and ease of customer use. The specification supports home (private) charging and public wireless charging.
It is anticipated, that, in the near term, vehicles that are capable to be charged wirelessly under this Technical Information Report (TIR) should also be able to be charged by SAE J1772 plug in chargers.
This TIR is planned to be standardized after the 2016 timeframe after receiving field data. The contents, including frequency, parameters, specifications, procedures and other contents of this TIR are to be re-evaluated at that time to allow for additional developments and future innovations.
SAE TIR J2954 is intended to be used for stationary applications (charging while vehicle is not in motion). Dynamic applications may be considered in the future based on industry feedback.
SAE TIR J2954 is meant to be used for interoperability testing, where a single master coil has been chosen for the WPT Power Class 1, per Z classes (1 and 2), however, there are two reference options for WPT 2 per Z-classes (1 through 3). In the future standard SAE J2954, the majority of team members believe there should be only one Master Vehicle Assembly Coil per each WPT Class and per Z-Class.
Rationale
Electrified powertrains, specifically Battery Electric and Plug-In Electric (BEV/ PHEV) vehicles are projected internationally to become more prevalent in production due to environmental factors (such as CO2 emissions), regulations (such as the Greenhouse Gas and the California ZEV Mandate) and the increasing price of fossil fuels. The main benefits of electrified powertrains are eliminating or significantly reducing local emissions while increasing the overall well-to-wheels efficiency.
Standardized Wireless Power Transfer (WPT) through wireless charging allows the BEV/ PHEV customer an automated and more convenient and alternative to plug-in (conductive) charging. Essentially the customer simply needs to park into a SAE J2954 compatible parking space (e.g., residential garage or parking structure) in order to charge the vehicle.
Recommended Content
Ground Vehicle Standard | Use Cases for Plug-In Vehicle Communication as a Distributed Energy Resource |
Ground Vehicle Standard | Recommended Practice for General Fuel Cell Vehicle Safety |
Ground Vehicle Standard | Use Cases for Customer Communication for Plug-in Electric Vehicles |
Topic
Data Sets - Support Documents
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Table 1 | WPT power classifications for L.D. vehicles | |
Table 2 | Interoperability by Power Class | |
Table 3 | Specification of the Z-classes | |
Table 4 | Compatibility between Z class GAs and VAs. | |
Table 6 | Positioning tolerance requirements for M-VAs | |
Table 11 | List of M-VA’s. | |
Table 12 | Reference-GA’s | |
Table 7 | Component Level EMC | |
Table 8 | EMF exposure standard: Reference levels | |
Table 10 | Pacemaker/IMD limits | |
Table 11 | EMF exposure measurement standards | |
Table 12 | Example worksheet for worst case operating condition search | |
Table 13 | Combined EMF and pacemaker limits for laboratory use | |
Table 14 | Measurements of fields | |
Table 15 | Minimum recommended requirements of coil positioning device | |
Table 15 | Physical properties of system under test | |
Table 16 | Charge Power Test Levels | |
Table 17 | Metrics vs X-Y Offset | |
Table 18 | Table of roll tolerance | |
Table 19 | Table of pitch tolerance | |
Table 20 | Table of yaw tolerance | |
Table 21 | Interoperability | |
Table 21 | Table of Test Objects | |
Table D1 | Secondary coil inductance L and impedance matching values | |
Table D3 | Secondary coil inductance L2 and secondary tuning capacitor C | |
Table E1 | Secondary coil inductance L and impedance matching values. | |
Table E3 | Secondary coil inductance L2 and secondary tuning capacitor C | |
Table F1 | Secondary coil inductance L and impedance matching values. | |
Table F3 | Secondary coil inductance L2 and secondary tuning capacitor C. | |
Table G1 | Primary coil inductance L1 depending on the Z class | |
Table G2 | Coupling k between primary and secondary coil depending on the Z class | |
Table H1 | Primary coil inductance L depending on the Z class | |
Table H2 | Coupling k between primary and secondary coil depending on the Z class | |
Table H4 | Primary coil inductance L1 depending on the Z class | |
Table H5 | Coupling k between primary and secondary coil depending on the Z class. | |
Table L1 | Approximate impact on VA of varying k based on design and chosen operation. | |
Table L2 | Approximate pad losses assuming , with two values of k and variations in primary and secondary operating Q | |
Table M2 | Methods of measurement | |
Unnamed Dataset 45 | ||
Unnamed Dataset 46 | ||
Table P1 | ||
Unnamed Dataset 48 | ||
Unnamed Dataset 49 |
Issuing Committee
The Hybrid Technical Standards Committee reports to the Powertrain Systems Group of the Motor Vehicle Council. The Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports related to the field of hybrid vehicle technology. The following topics are within the scope of this committee's work: safety aspects of hybrid systems in vehicles, test procedures to establish the performance of hybrid systems and components, nomenclature, as well as vehicle interface and serviceability requirements Participants in the SAE Hybrid Technical Standards Committee include OEMs, suppliers, consulting firms, government, and other interested parties.
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