An electric vehicle ground control system and vehicle approach control method thereof

Abstract

The present invention discloses a ground power supply system for an electric vehicle and a vehicle approach confirmation control method thereof. A magnetic signal covering strip is arranged at the bottom of the vehicle, and each power supply module on the line is evenly arranged with N magnetic field sensors in sequence along the direction of vehicle travel. When the n magnetic field sensors simultaneously detect the magnetic signal of the vehicle, the connection between the power supply module and the safety negative electrode is disconnected, and the connection between the power supply module and the power supply module is connected; otherwise, the connection between the power supply and the power supply module is disconnected, and the connection between the power supply module and the safety negative electrode is connected. The approaching state of the vehicle can be accurately confirmed, and the power supply or the connection between the safety negative electrode and the power supply module can be connected or disconnected in a timely and safe manner, completely eliminating the adverse effects of various mobile communication devices on the safe operation of the vehicle and the safe power supply on the ground. When n takes a value of 2 or more, it can further eliminate the influence of external factors, such as malfunctions caused by children playing with magnets.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle power supply, and in particular to a vehicle approach confirmation control method and device for an electric vehicle ground power supply system. Background Art

[0002] The ground power supply technology for electric vehicles is beginning to be favored by urban builders because of its advantages such as eliminating overhead network cables, convenient and safe access, and favorable urban landscape. This ground power supply technology initially used a contact switch circuit module to continuously supply power to the vehicle in sections. When the vehicle is approaching, the conductor element of the module is disconnected from the ground potential by means of the magnetic pickup device on the vehicle, and the positive feeder is connected to the conductor element of the module; when the vehicle is far away, the magnetic pickup device on the vehicle is lost, the feeder is disconnected from the conductor element of the module, and the conductor element of the module is restored to the ground potential. This method has many faults and short circuits often occur; the power supply module is directly connected to the power supply system, and the fault diagnosis in the system does not have the function of isolating the fault of the power supply module; when the module fails, the positive contact will stick, making the module positively charged, endangering personal safety; when there is no vehicle operation, a safe negative circuit is used to ground the surface of the module; because the safe negative line has multiple bolt connections, when the bolts are rusted or loose, the safe negative circuit will be open, causing protection failure.

[0003] The above problems have been well solved in Chinese patent application No. 201910804298.4. The patent application proposes a ground power supply device for electric vehicles, in which adjacent power supply rails are insulated and connected to form a power supply rail line. For each section of the power supply rail, there are: a power switch circuit connected between the positive pole of the power supply and the power supply rail; a safety grounding switch circuit connected between the power supply rail and the safety negative pole; a controller that receives the vehicle approach signal and the electrical signal of the power supply rail to control the on and off of the power switch circuit and the safety grounding switch circuit. A contactless electronic switch is used to lead the power supply to the power supply rail, and a safety negative pole safety grounding switch circuit is introduced, which solves the power supply safety problem and realizes that the power supply rail module only outputs power quickly within a certain distance near the vehicle current collector, so that the vehicle current collector continuously receives current, and the power supply rail modules at other positions automatically turn off the power supply and ensure safe grounding.

[0004] In the prior art, it is customary to confirm the approaching status of a vehicle based on the communication between the on-board communication equipment and the control beacon arranged on the extension line, so as to implement control over the vehicle. However, there are a large number of mobile communication devices both on the ground and on the vehicle, which interfere with the communication between the on-board communication equipment and the control beacon. Such interference can cause malfunction of the power supply system, affect the normal operation of the vehicle, and even endanger personal safety. Summary of the invention

[0005] In order to solve the above technical problems, the embodiments of the present invention provide a vehicle approach confirmation control method and device for an electric vehicle ground power supply system to solve the problems of the prior art.

[0006] On the one hand, an embodiment of the present invention discloses a vehicle approach confirmation control method for an electric vehicle ground power supply system, wherein a magnetic signal covering strip is arranged at the bottom of the vehicle, and each power supply module on the line is evenly arranged with N magnetic field sensors in sequence along the vehicle travel direction, 2≤N, and the control steps are as follows:

[0007] A. When the vehicle approaches the power supply module, its magnetic signal coverage strips cover the magnetic field sensors in sequence; when the vehicle moves away from the power supply module, its magnetic signal coverage strips leave the magnetic field sensors in sequence;

[0008] B. When the number of magnetic field sensors S that simultaneously measure the vehicle magnetic signal n ≥n, disconnect the power supply module from the safety negative pole, detect that the potential of the power supply module is in a suspended state, and then connect the power supply to the power supply module, 1≤n<N;

[0009] C. When the number of magnetic field sensors S that simultaneously measure the vehicle magnetic signal n When <n, disconnect the power supply from the power supply module, detect that the potential of the power supply module is in a floating state, and then connect the power supply module to the safety negative electrode.

[0010] Furthermore, a magnetic signal covering strip is set at the bottom of the vehicle, and each power supply module on the line is evenly set with N magnetic field sensors in sequence along the direction of vehicle travel, 2≤N, and the length of the magnetic signal covering strip is L MB ≥nL S , where 1≤n<N, L S is the distance between adjacent magnetic field sensors, the power switch is connected between the positive pole of the power supply and the power supply module, the safety grounding switch is connected between the power supply module and the safety negative pole, the input end of the surface potential detection circuit of the power supply module is connected to the power supply module, and the controller receives the vehicle magnetic signal detected by the magnetic field sensor and the output signal of the potential detection circuit to control the on and off of the power switch and the safety grounding switch.

[0011] Furthermore, adjacent power supply modules each have m magnetic field sensors arranged at the end position of the other party, n≤m<N.

[0012] Furthermore, said n=2.

[0013] Furthermore, in the potential detection circuit PD, resistors R1 and R2 are connected in series between the power supply module and the safe negative electrode, the junction between the resistors R1 and R2 is connected to the controller, the cathode of the diode D1 is connected to the power supply module, the anode is connected to a safe low-voltage DC power supply through the resistor R3, and the junction between the anode of the diode D1 and the resistor R3 is connected to the controller.

[0014] On the other hand, an embodiment of the present invention further discloses a ground power supply system for an electric vehicle, which adopts the above-mentioned control method and the device described in claims 2, 3, 4 and 5.

[0015] The embodiment of the present invention further discloses a controller, including:

[0016] processor;

[0017] Memory; and

[0018] Computer programs;

[0019] The computer program is stored in the memory and configured to be executed by the processor, wherein the computer program includes instructions for the control method according to claim 1.

[0020] The embodiment of the present invention further discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables a controller to execute the above control method.

[0021] By adopting the above technical solution, the present invention has at least the following beneficial effects:

[0022] It can accurately confirm the approaching status of the vehicle, timely and safely connect or disconnect the power supply or the connection between the safety negative pole and the power supply module, and completely eliminate the adverse effects of various mobile communication devices on the safe operation of the vehicle and the safe power supply on the ground. MB ≥nL S , it can ensure that when the magnetic signal covering strip and the power receiving shoe are lowered, they can cover at least n adjacent magnetic field sensors, so that the power supply module can be powered immediately; when n is 2 or above, it can further prevent external factors such as malfunction caused by children playing with magnets. Each adjacent power supply module has m magnetic field sensors arranged at the end of the other side. When the magnetic signal covering strip moves to the end of the current power supply module, the adjacent power supply module immediately enters the power supply state in advance, providing a reliable guarantee for smooth and continuous power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of a vehicle approach confirmation control device of an electric vehicle ground power supply system according to an embodiment of the present invention.

[0025] Figure 2 The present invention is a flow chart of a vehicle approach confirmation control method of an electric vehicle ground power supply system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1 In the vehicle approach confirmation control device of the electric vehicle ground power supply system of the embodiment of the present invention, the magnetic signal coverage MB is set at the bottom of the vehicle, each power supply module on the line is 3m long, 13 magnetic field sensors MS are evenly arranged in sequence along the direction of vehicle travel, and 2 magnetic field sensors are arranged at the end positions of adjacent power supply modules at each end. The spacing between adjacent magnetic field sensors is L S =33cm, the length of the magnetic signal covering strip is L MB =67cm.

[0028] The power switch PS is connected between the positive pole of the power supply and the power supply module PM, the safety grounding switch ES is connected between the power supply module PM and the safety negative pole, the potential detection circuit PD is connected to the power supply module PM, and the controller CONTROL receives the vehicle magnetic signal detected by the magnetic field sensor and the output signal of the potential detection circuit to control the on and off of the power switch and the safety grounding switch. In the potential detection circuit, the resistors R1 and R2 are connected in series between the power supply module and the safety negative pole, the junction between the resistors R1 and R2 is connected to the controller, the cathode of the diode D1 is connected to the power supply module, the anode is connected to a safety low-voltage DC power supply through the resistor R3, and the junction between the anode of the diode D1 and the resistor R3 is connected to the controller.

[0029] See attached Figure 2, the vehicle approach confirmation control method of the electric vehicle ground power supply system of the embodiment of the present invention starts initialization. Enter box 1 to detect the vehicle magnetic signal. Enter judgment box 2 to see whether the number of magnetic field sensors Sn≥2 of the vehicle magnetic signal is measured at the same time: if yes, enter box A1; otherwise, enter box B1. In box A1, disconnect the safety grounding switch, and the power supply module is no longer connected to the safety negative pole. Enter judgment box A2 to detect whether the potential of the power supply module is in a suspended state, that is, whether the potential of the contact between the anode of the diode D1 and the resistor R3 is a high potential: if yes, enter box A3, turn on the power switch, the power supply supplies power to the power supply module, and then enter judgment box 4; otherwise, enter box A5 to alarm that a fault has occurred. In judgment box A4, see whether the number of magnetic field sensors Sn≥2 of the vehicle magnetic signal is measured at the same time: if yes, cycle in place; otherwise, enter box B1. In box B1, disconnect the power switch, and the power supply is no longer connected to the power supply module. Enter box B2 to check whether the potential of the power supply module is suspended, that is, whether the potential of the contact between resistors R1 and R2 is low: if yes, enter box B3, turn on the safety grounding switch, connect the power supply module to the safety negative pole, and then enter judgment box B4; otherwise, enter box B5 and alarm a fault. In judgment box B4, check whether the number of magnetic field sensors Sn of the vehicle magnetic signal is measured at the same time ≥ 2: otherwise, loop in place; if yes, enter box A1.

[0030] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A vehicle approach confirmation control method for an electric vehicle ground power supply system, characterized in that A magnetic signal covering strip is set at the bottom of the vehicle. Each power supply module on the line is evenly set with N magnetic field sensors in sequence along the direction of vehicle travel, 2≤N. The control steps are as follows: A. When the vehicle approaches the power supply module, its magnetic signal coverage strips cover the magnetic field sensors in sequence; when the vehicle moves away from the power supply module, its magnetic signal coverage strips leave the magnetic field sensors in sequence; B. When the number of magnetic field sensors S that simultaneously measure the vehicle magnetic signal n ≥n, disconnect the power supply module from the safety negative pole, detect that the potential of the power supply module is in a suspended state, and then connect the power supply to the power supply module, 1≤n<N; C. When the number of magnetic field sensors S that simultaneously measure the vehicle magnetic signal n When <n, disconnect the power supply from the power supply module, detect that the potential of the power supply module is in a suspended state, and then connect the power supply module to the safety negative electrode; A magnetic signal covering strip is set at the bottom of the vehicle. Each power supply module on the line is evenly set with N magnetic field sensors in the direction of the vehicle. 2≤N, the length of the magnetic signal covering strip is L MB ≥nL S , where 1≤n<N, L S is the distance between adjacent magnetic field sensors, the power switch is connected between the positive pole of the power supply and the power supply module, the safety grounding switch is connected between the power supply module and the safety negative pole, the input end of the surface potential detection circuit of the power supply module is connected to the power supply module, and the controller receives the vehicle magnetic signal detected by the magnetic field sensor and the output signal of the potential detection circuit to control the on and off of the power switch and the safety grounding switch.

2. The control method according to claim 1, characterized in that Each adjacent power supply module has m magnetic field sensors arranged at the end position of the other party, n≤m<N.

3. The control method according to claim 1 or 2, characterized in that Said n=2.

4. The control method according to claim 1, characterized in that The potential detection circuit PD, resistors R1 and R2 are connected in series between the power supply module and the safety negative electrode, the junction between the resistors R1 and R2 is connected to the controller, the cathode of the diode D1 is connected to the power supply module, the anode is connected to a safe low-voltage DC power supply through the resistor R3, and the junction between the anode of the diode D1 and the resistor R3 is connected to the controller.

5. An electric vehicle ground power supply system, characterized in that The control method according to any one of claims 1 to 4 is adopted.

6. A controller, characterized in that include: processor; Memory; as well as Computer programs; The computer program is stored in the memory and is configured to be executed by the processor, and the computer program includes instructions for the control method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program enables the controller to execute the control method according to any one of claims 1 to 4.

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