A multi-rail wireless power supply mode electric vehicle identification method

Abstract

The invention belongs to the field of multi-guide-rail wireless power supply of electric vehicles, and specifically relates to a method for recognizing an electric vehicle in a multi-guide-rail wireless power supply mode. The method comprises the steps of (1) positioning a secondary side coil, and determining the current load state by detecting the input voltage Udc of an inverter circuit; (2) detecting the voltage of an emission guide rail end, comparing with the given preset voltage value delta, namely, detecting the end voltage Up (i-1) and Up (i+1) of the guide rail sections Lp (i-1) and Lp (i+1) when the electric vehicle runs on the sectional guide rail Lpi; if the Up (i+1) is not less than delta, turning the electric vehicle to the guide rail section Lp (i+1), conversely, Up(i+1) is not less than lt, and turning the electric vehicle to the guide rail section Lp (i-1). According to the method, the current and voltage of the guide rail are detected, the running position and direction of the electric vehicle are determined, and the method is simple, reliable, and high in accuracy and stability.

Description

technical field [0001] The invention belongs to the field of multi-rail wireless power supply for electric vehicles, and in particular relates to an identification method for electric vehicles in a multi-rail wireless power supply mode. Background technique [0002] The non-contact power transmission (CPT) technology based on the principle of electromagnetic induction coupling increases the flexibility of electrical equipment and makes up for the defects of device wear, carbon deposition and electric sparks in the traditional contact power transmission method, so it is a safe , Reliable and flexible power access new technology, however, because CPT technology is still in its infancy, the energy efficiency (transmission power and efficiency) of the system is still low, which affects its promotion and application. [0003] The centralized power supply guide rail mode is usually coupled by one or more pick-up mechanisms with the same long guide rail coil. The primary guide rail...

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Problems solved by technology

[0002] The non-contact power transmission (CPT) technology based on the principle of electromagnetic induction coupling increases the flexibility of electrical equipment and makes up for the defects of device wear, carbon deposition and electric sparks in the traditional contact power transmission method, so it is a safe , reliable and flexible power access new technology, however, because CPT technology is still in its infancy, the energy efficiency (transmission power and efficiency) of the system is still low, which affects its promotion and application

[0003] The centralized power supply guide rail mode is usually coupled by one or more pick-up mechanisms with the same long guide rail coil. The primary guide rail is a long straight wire, and the secondary side is a group of concentrated winding wires. Only a part of the primary guide rail participates in the coupling; In the automotive wireless power supply system, in order to provide sufficient power supply for electric vehicles, the energy emission guide rail is generally several kilometers or tens of kilometers long, and the current is usually tens of kilohertz, tens or even hundreds of amperes of high-frequency AC, increasing The leakage inductance of the primary and secondary sides is reduced, resulting in a large potential drop on the leakage inductance of the primary and secondary sides, which reduces the efficiency of the system and makes the system sensitive to changes in parameters, that is, a small change in any parameter may destroy the system. stability

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