CN113834949B - Speed measuring method, device and equipment for wireless charging electric automobile and storage medium - Google Patents

Speed measuring method, device and equipment for wireless charging electric automobile and storage medium Download PDF

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Publication number
CN113834949B
CN113834949B CN202010514118.1A CN202010514118A CN113834949B CN 113834949 B CN113834949 B CN 113834949B CN 202010514118 A CN202010514118 A CN 202010514118A CN 113834949 B CN113834949 B CN 113834949B
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China
Prior art keywords
stress
wireless charging
electric automobile
micro
magnetic force
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CN202010514118.1A
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CN113834949A (en
Inventor
吴鹏飞
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The disclosure relates to a speed measuring method, device and equipment for a wireless charging electric automobile and a storage medium. A stress detection device and a magnetic force induction device are arranged on a coil of a wireless charging receiving end of the electric automobile; the method comprises the following steps: the stress detection device is utilized to obtain the stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end, and the wireless charging transmitting end is arranged on a road surface; the magnetic force induction device is utilized to acquire the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end; and determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end. The system can reduce the cost of the system on the basis of realizing accurate speed measurement of the electric automobile.

Description

Speed measuring method, device and equipment for wireless charging electric automobile and storage medium
Technical Field
The disclosure relates to the technical field of charging, and in particular relates to a speed measuring method, device and equipment for a wireless charging electric automobile and a storage medium.
Background
With the rise of new energy electric automobile technology, electric car charging has become a technology development hot spot instead of automobile refueling. At present, the battery charging mode of the electric automobile is mainly charging by a charging pile, but the charging mode is limited by the placement position of the charging pile, so that the problem of more and less vehicles is more and more obvious. For this reason, a scheme of charging an electric vehicle based on a wireless charging mode is also proposed in the related art, that is, the electric vehicle can be charged by using a charging pile and also can be charged by using a wireless charging receiving coil which is installed in advance.
On the basis, how to provide an effective way for measuring the speed of the new energy electric automobile becomes one of the technical problems to be solved in the related art.
Disclosure of Invention
In order to overcome the problems in the related art, embodiments of the present disclosure provide a method, an apparatus, a device, and a storage medium for measuring a speed of a wireless charging electric vehicle, so as to solve the defects in the related art.
According to a first aspect of embodiments of the present disclosure, a method for measuring a speed of a wireless charging electric vehicle is provided, where a stress detection device and a magnetic force induction device are disposed on a coil of a wireless charging receiving end of the electric vehicle;
The method comprises the following steps:
The stress detection device is utilized to obtain the stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end, and the wireless charging transmitting end is arranged on a road surface;
The magnetic force induction device is utilized to acquire the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end;
and determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end.
In an embodiment, the magnetic induction device comprises a first magnetometer and a second magnetometer, wherein the installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the coil center of the wireless charging receiving end;
the method for acquiring the field intensity of the magnetic field of the electric automobile by using the magnetic induction device when the wireless charging receiving end is connected with the wireless charging transmitting end comprises the following steps:
Acquiring a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
And determining the field intensity of the magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value.
In an embodiment, the determining the field strength of the magnetic field where the electric vehicle is located based on the first magnetic force value and the second magnetic force value includes:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located.
In an embodiment, the stress detection device comprises a first micro stress sensor and a second micro stress sensor;
The step of obtaining the stress suffered by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end by using the stress detection device comprises the following steps:
acquiring first micro stress detected by the first micro stress sensor and second micro stress detected by the second micro stress sensor;
And determining the stress suffered by the electric automobile based on the first micro stress and the second micro stress.
In an embodiment, the method further comprises:
calculating a difference between the first micro-stress and the second micro-stress;
and executing the operation of determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress under the condition that the difference value is smaller than a set threshold value.
In an embodiment, the determining the speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress, and the field strength by the wireless charging receiving terminal includes:
acquiring acceleration of the electric automobile;
And determining the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the acceleration.
In an embodiment, the determining the speed of the electric vehicle based on the effective cutting length, the stress, the field strength, the mass of the coil of the wireless charging receiver, and the acceleration includes:
Calculating a correction value of acceleration of the electric vehicle based on a first speed of the electric vehicle at a current time and a second speed of the electric vehicle at a previous time;
and determining a correction value of the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the correction value of the acceleration.
In an embodiment, the method further comprises:
And sending the speed of the electric automobile to a service end of a traffic management department based on a wireless charging protocol.
According to a second aspect of the embodiments of the present disclosure, a speed measuring device of a wireless charging electric automobile is provided, wherein a stress detecting device and a magnetic force sensing device are arranged on a coil of a wireless charging receiving end of the electric automobile;
The device comprises:
The stress acquisition module is used for acquiring stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end by using the stress detection device, and the wireless charging transmitting end is arranged on a road surface;
the field intensity acquisition module is used for acquiring the field intensity of the magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end by utilizing the magnetic force induction device;
And the speed determining module is used for determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end.
In an embodiment, the magnetic induction device comprises a first magnetometer and a second magnetometer, wherein the installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the coil center of the wireless charging receiving end;
The field intensity acquisition module comprises:
The magnetic force value acquisition unit is used for acquiring a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
the field intensity determining unit is used for determining the field intensity of the magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value.
In an embodiment, the field strength determination unit is further configured to:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located.
In an embodiment, the stress detection device comprises a first micro stress sensor and a second micro stress sensor;
the stress acquisition module comprises:
The micro stress acquisition unit is used for acquiring the first micro stress detected by the first micro stress sensor and the second micro stress detected by the second micro stress sensor;
and the stress determining unit is used for determining the stress born by the electric automobile based on the first micro stress and the second micro stress.
In an embodiment, the stress acquisition module further comprises:
A difference calculating unit for calculating a difference between the first micro stress and the second micro stress;
The stress determination unit is further configured to perform the operation of determining the stress to which the electric vehicle is subjected based on the first micro stress and the second micro stress, in a case where the difference is smaller than a set threshold.
In one embodiment, the speed determination module includes:
An acceleration acquisition unit for acquiring the acceleration of the electric automobile;
And the speed determining unit is used for determining the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the acceleration.
In an embodiment, the speed determining unit is further configured to:
Calculating a correction value of acceleration of the electric vehicle based on a first speed of the electric vehicle at a current time and a second speed of the electric vehicle at a previous time;
and determining a correction value of the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the correction value of the acceleration.
In an embodiment, the device further comprises:
And the speed sending module is used for sending the speed of the electric automobile to a service end of a traffic management department based on a wireless charging protocol.
According to a third aspect of embodiments of the present disclosure, a speed measurement system of a wireless charging electric vehicle is provided, the system including a wireless charging transmitting end disposed on a road surface and a wireless charging receiving end disposed on the electric vehicle; the electric automobile comprises a speed determining device, and a stress detecting device and a magnetic force sensing device are arranged on a coil of the wireless charging receiving end;
The stress detection device is used for acquiring stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end;
The magnetic force induction device is used for acquiring the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end;
the speed determining device is used for determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end.
According to a fourth aspect of the embodiments of the present disclosure, a speed measuring device for a wireless charging electric automobile is provided, where a stress detecting device and a magnetic force sensing device are disposed on a coil of a wireless charging receiving end of the electric automobile;
The speed measuring apparatus includes:
A processor and a memory for storing processor-executable instructions;
wherein the processor is configured to:
The stress detection device is utilized to obtain the stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end, and the wireless charging transmitting end is arranged on a road surface;
The magnetic force induction device is utilized to acquire the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end;
and determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end.
According to a fifth aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
the method comprises the steps that stress on an electric automobile is obtained when a wireless charging receiving end is connected with a wireless charging sending end by using a stress detection device, and the wireless charging sending end is arranged on a road surface;
acquiring the field intensity of a magnetic field where the electric automobile is positioned when the wireless charging receiving end is connected with the wireless charging transmitting end by utilizing a magnetic induction device;
and determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
According to the method, the stress born by the electric automobile is acquired when the wireless charging receiving end is connected with the wireless charging sending end by using the stress detection device, and the field intensity of the magnetic field where the electric automobile is positioned is acquired when the wireless charging receiving end is connected with the wireless charging sending end by using the magnetic force induction device, so that the speed of the electric automobile is determined based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the magnetic induction line cut by the wireless charging receiving end, the speed of the electric automobile can be accurately determined, and the stress born by the electric automobile and the field intensity of the magnetic field where the electric automobile is positioned are acquired only by depending on the stress detection device and the magnetic force induction device arranged on the coil of the wireless charging receiving end, so that the structure of a wireless charging system in related technology is not required to be greatly changed, and only the stress detection device and the magnetic force induction device are required to be increased, and the cost of the system can be reduced on the basis of realizing accurate speed measurement of the electric automobile.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a flowchart illustrating a method of measuring a speed of a wireless charging electric car according to an exemplary embodiment;
FIG. 2A is a flow chart illustrating how to obtain the field strength of a magnetic field in which the electric vehicle is located, according to an exemplary embodiment;
FIG. 2B is a schematic diagram of a wireless charging system of an electric vehicle, shown according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating how the field strength of a magnetic field in which the electric vehicle is located may be determined based on the first magnetic force value and the second magnetic force value, according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating how the stresses experienced by the electric vehicle are obtained, according to an exemplary embodiment;
fig. 5A is a flowchart showing how to obtain the stress to which the electric automobile is subjected according to still another exemplary embodiment;
FIG. 5B is a schematic diagram illustrating magnetometer sensing magnitudes and microstress magnitudes, according to an exemplary embodiment;
FIG. 6A is a flowchart illustrating how to determine the speed of the electric vehicle, according to an example embodiment;
FIG. 6B is a simplified model schematic diagram illustrating a speed measurement of an electric vehicle, according to an example embodiment;
fig. 7 is a flowchart showing how to determine the speed of the electric vehicle according to still another exemplary embodiment;
fig. 8 is a flowchart illustrating a method of measuring a speed of a wireless charging electric car according to still another exemplary embodiment;
Fig. 9 is a schematic diagram of an application scenario of a speed measurement method of a wireless charging electric vehicle according to an exemplary embodiment;
fig. 10 is a block diagram illustrating a speed measuring device of a wireless charging electric car according to an exemplary embodiment;
fig. 11 is a block diagram illustrating a speed measuring device of a wireless charging electric car according to still another exemplary embodiment;
Fig. 12 is a block diagram of an electronic device, according to an example embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
Fig. 1 is a flowchart illustrating a speed measuring method of a wireless charging electric car according to a first exemplary embodiment. The speed measuring method of the wireless charging electric automobile can be applied to wireless charging electric automobiles (such as new energy electric automobiles and the like). The coil of the wireless charging receiving end of the electric automobile is provided with a stress detection device and a magnetic force induction device. As shown in fig. 1, the method includes the following steps S101-S103:
in step S101, the stress applied to the electric automobile is obtained by using the stress detection device when the wireless charging receiving end is connected with the wireless charging transmitting end.
Wherein, wireless charging transmitting terminal sets up on the road surface.
In this embodiment, the stress detection device may be set by a developer based on actual service requirements, for example, a micro stress sensor, which is not limited in this embodiment.
For example, after the electric automobile travels in a speed measuring area provided with a wireless charging transmitting end, a wireless charging receiving end on the electric automobile is connected with a wireless charging transmitting end on the ground, and then stress born by the electric automobile can be obtained by using a stress detection device.
In step S102, the magnetic induction device is used to obtain the field strength of the magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end.
In this embodiment, the magnetic force sensing device may be set by a developer based on actual service needs, for example, set as a magnetometer, which is not limited in this embodiment.
For example, after the electric automobile travels in a speed measuring area provided with a wireless charging transmitting end, a wireless charging receiving end on the electric automobile is connected with a wireless charging transmitting end on the ground, so that the magnetic force induction device can be used for acquiring the field intensity of a magnetic field where the electric automobile is located.
In step S103, the speed of the electric vehicle is determined based on the effective cutting length of the magnetic induction line in the magnetic field, the stress, and the field intensity of the wireless charging receiving terminal.
In this embodiment, after the stress suffered by the electric automobile and the field intensity of the magnetic field where the electric automobile is located are obtained, the speed of the electric automobile may be determined based on the effective cutting length of the magnetic induction line in the magnetic field cut by the wireless charging receiving end, the stress and the field intensity.
The effective cutting length of the magnetic induction wire in the magnetic field by the wireless charging receiving end can be the coil length of the wireless charging receiving end.
For example, when an electric vehicle runs in a test area at a constant speed, the stress suffered by the electric vehicle and the field strength of the magnetic field where the electric vehicle is located can be obtained, and then the speed of the electric vehicle can be determined based on the stress, the field strength, the effective cutting length and the following formula (1) according to lenz's law:
V＝F/(B·L) (1)。
v is the speed of the electric automobile, F is the stress to which the electric automobile is subjected, B is the field intensity of a magnetic field where the electric automobile is located, and L is the effective cutting length of a magnetic induction line in the magnetic field by a wireless charging receiving end.
In another embodiment, the above manner of determining the speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field strength of the wireless charging receiving terminal may be referred to as an embodiment shown in fig. 6A, which is not described in detail herein.
As can be seen from the above description, in this embodiment, the stress on the electric vehicle is obtained when the wireless charging receiving end is connected to the wireless charging transmitting end by using the stress detection device, and the field intensity of the magnetic field where the electric vehicle is located is obtained when the wireless charging receiving end is connected to the wireless charging transmitting end by using the magnetic force sensing device, so that the speed of the electric vehicle is determined based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the magnetic induction line cut by the wireless charging receiving end, and the speed of the electric vehicle can be accurately determined.
FIG. 2A is a flow chart illustrating how to obtain the field strength of a magnetic field in which the electric vehicle is located, according to an exemplary embodiment; the present embodiment is exemplified by how to obtain the field strength of the magnetic field where the electric vehicle is located on the basis of the above embodiments. For example, fig. 2B is a schematic diagram of a wireless charging system of an electric vehicle, according to an exemplary embodiment. Wherein the magnetic induction device comprises a first magnetometer and a second magnetometer (two magnetometers shown as 130 in fig. 2B), the mounting positions of the first magnetometer and the second magnetometer are symmetrical with respect to the center of the coil of the wireless charging receiving terminal 100.
As shown in fig. 2A, in the step 102, the step of obtaining, by using the magnetic induction device, the field strength of the magnetic field where the electric vehicle is located when the wireless charging receiving end is connected to the wireless charging transmitting end may include the following steps S201 to S202:
In step S201, a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer are acquired.
For example, as shown in fig. 2B, when the wireless charging receiving end 100 is connected to the wireless charging transmitting end 200, the first magnetic force value and the second magnetic force value can be detected by the two magnetometers 130.
In step S202, the field strength of the magnetic field where the electric vehicle is located is determined based on the first magnetic force value and the second magnetic force value.
In this embodiment, after the first magnetic force value detected by the first magnetometer and the second magnetic force value detected by the second magnetometer are obtained, the field strength of the magnetic field where the electric automobile is located may be determined based on the first magnetic force value and the second magnetic force value.
In an embodiment, after the first magnetic force value and the second magnetic force value are obtained, the field strength of the magnetic field where the electric vehicle is located may be determined based on the first magnetic force value, the second magnetic force value, and the positional relationship between the first magnetometer and the second magnetometer.
In another embodiment, the above manner of determining the field strength of the magnetic field where the electric vehicle is located based on the first magnetic force value and the second magnetic force value may be referred to as an embodiment shown in fig. 3, which is not described in detail herein.
It should be noted that, the coil shape of the wireless charging transmitting end in fig. 2B is not necessarily circular, and in practical application, the coil shape may be set to be square based on practical requirements and cover the whole road width, so that wireless charging can be performed on the electric automobile on the parking spaces on two sides of the road. In an embodiment, the area of the coil of the transmitting end may be larger than the area of the coil of the receiving end, so that the electric vehicle can be flexibly parked in the wireless charging area (i.e. can be charged without being aligned intentionally), and the accuracy of speed measurement can be increased.
As can be seen from the above description, in this embodiment, by obtaining the first magnetic force value detected by the first magnetometer and the second magnetic force value detected by the second magnetometer, and determining the field strength of the magnetic field where the electric vehicle is located based on the first magnetic force value and the second magnetic force value, the field strength of the magnetic field where the electric vehicle is located can be accurately determined, so that the basis for determining the speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field strength of the magnetic induction line in the magnetic field by the wireless charging receiving end is laid, the speed of the electric vehicle can be accurately determined, and the field strength of the magnetic field where the electric vehicle is located is determined by adopting two magnetometers, which is more beneficial to coping with the field strength change of the magnetic field, and improving the accuracy of determining the field strength.
FIG. 3 is a flow chart illustrating how the field strength of a magnetic field in which the electric vehicle is located may be determined based on the first magnetic force value and the second magnetic force value, according to an exemplary embodiment; the present embodiment is exemplified by how the field strength of the magnetic field where the electric vehicle is located is determined based on the first magnetic force value and the second magnetic force value on the basis of the above embodiments. As shown in fig. 3, the determining the field strength of the magnetic field where the electric vehicle is located in the step 202 based on the first magnetic force value and the second magnetic force value may include the following steps S301 to S302:
In step S301, a spacing between the first magnetometer and the second magnetometer is acquired.
In this embodiment, the distance between the first magnetometer and the second magnetometer may be obtained in advance based on a set distance detection mode.
It should be noted that, the above-mentioned set distance detection manner may be set by a developer based on actual service requirements, which is not limited in this embodiment.
In step S302, substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located.
In this embodiment, after the distance between the first magnetometer and the second magnetometer is obtained, the first magnetic force value, the second magnetic force value and the distance may be substituted into a predetermined field intensity calculation function, so as to obtain the field intensity of the magnetic field where the electric automobile is located.
For the distance, after the magnetic force values B1 and B2 detected by the first magnetometer and the second magnetometer are obtained, corresponding weights can be allocated to the magnetic force values B1 and B2, and then the field intensity B of the magnetic field where the electric automobile is located is determined based on the function shown in the following formula (2):
B＝f(B1，B2，x) (2)
where x is the separation between the first magnetometer and the second magnetometer, which is a constant value.
It should be noted that the function f (·) may depend on the specific wireless charging transmitting terminal, the wireless charging receiving terminal, the installation location, and the type of the magnetometer selected, and different functions may be used by different automobile manufacturers, which is not limited in this embodiment.
As can be seen from the above description, in this embodiment, by obtaining the distance between the first magnetometer and the second magnetometer, and substituting the first magnetic force value, the second magnetic force value, and the distance into a predetermined field strength calculation function, the field strength of the magnetic field where the electric vehicle is located is obtained, so that the accuracy of determining the field strength of the magnetic field where the electric vehicle is located can be improved, and the accuracy of determining the speed of the electric vehicle based on the field strength can be improved, and since the stress detection device and the magnetic induction device which are only set on the coil of the wireless charging receiving end are relied on to obtain the stress suffered by the electric vehicle and the field strength of the magnetic field where the electric vehicle is located, the structure of the wireless charging system in the related art is not required to be greatly changed, and only the stress detection device and the magnetic induction device are required to be increased, so that the cost of the system can be reduced on the basis of realizing accurate speed measurement of the electric vehicle.
FIG. 4 is a flow chart illustrating how the stresses experienced by the electric vehicle are obtained, according to an exemplary embodiment; the present embodiment is exemplified by how to obtain the stress to which the electric vehicle is subjected on the basis of the above-described embodiments. For example, fig. 2B is a schematic diagram of a wireless charging system of an electric vehicle, according to an exemplary embodiment. Wherein the stress detection means comprises a first micro-stress sensor and a second micro-stress sensor (two micro-stress sensors as shown at 120 in fig. 2B).
As shown in fig. 4, the step 101 of obtaining the stress suffered by the electric vehicle when the wireless charging receiving end is connected to the wireless charging transmitting end by using the stress detection device may include the following steps S401 to S402:
In step S401, a first micro stress detected by the first micro stress sensor and a second micro stress detected by the second micro stress sensor are obtained.
For example, as shown in fig. 2B, when the wireless charging receiving end 100 is connected to the wireless charging transmitting end 200, the first micro stress and the second micro stress can be detected by the two micro stress sensors 120.
In step S402, a stress to which the electric vehicle is subjected is determined based on the first micro stress and the second micro stress.
In this embodiment, after the first micro stress detected by the first micro stress sensor and the second micro stress detected by the second micro stress sensor are obtained, the stress to which the electric automobile is subjected may be determined based on the first micro stress and the second micro stress.
For example, after the first micro stress and the second micro stress are obtained, the stress to which the electric vehicle is subjected may be determined based on the sum of the first micro stress and the second micro stress.
As can be seen from the above description, in this embodiment, by acquiring the first micro stress detected by the first micro stress sensor and the second micro stress detected by the second micro stress sensor, and determining the stress suffered by the electric vehicle based on the first micro stress and the second micro stress, the accuracy of determining the stress received by the electric vehicle can be improved, and the accuracy of determining the speed of the electric vehicle based on the stress can be improved, and since the stress detection device and the magnetic induction device arranged on the coil of the wireless charging receiving end are only relied on to acquire the stress suffered by the electric vehicle and the field intensity of the magnetic field where the electric vehicle is located, the structure of the wireless charging system in the related art is not required to be greatly changed, and only the stress detection device and the magnetic induction device are required to be increased, so that the cost of the system can be reduced on the basis of realizing accurate speed measurement of the electric vehicle.
Fig. 5A is a flowchart showing how to obtain the stress to which the electric automobile is subjected according to still another exemplary embodiment; the present embodiment is exemplified by how to obtain the stress to which the electric vehicle is subjected on the basis of the above-described embodiments. In this embodiment, the stress detection device includes a first micro stress sensor and a second micro stress sensor.
As shown in fig. 5A, the step 101 of using the stress detection device to obtain the stress suffered by the electric vehicle when the wireless charging receiving end is connected to the wireless charging transmitting end may include the following steps S501 to S503:
In step S501, a first micro stress detected by the first micro stress sensor and a second micro stress detected by the second micro stress sensor are obtained.
The explanation and explanation of steps S501 and S503 may be referred to the above embodiments, and are not repeated here.
In step S502, a difference between the first micro stress and the second micro stress is calculated.
In this embodiment, after the first micro stress F 1 detected by the first micro stress sensor and the second micro stress F 2 detected by the second micro stress sensor are obtained, a difference between the first micro stress F 1 and the second micro stress F 2 may be calculated.
It is worth noting that FIG. 5B is a schematic diagram illustrating magnetometer induced and microstress levels, according to an exemplary embodiment. As shown in fig. 5B, in the constant-speed running state of the vehicle, F 1 or F 2 is a spike signal, as shown in the right diagram in fig. 5B, the difference (F 1-F2) between the first micro stress F 1 and the second micro stress F 2 is a signal approximately 0, because the micro deformation amount generated by the fixing device at the left end and the right end of the coil is the same no matter the electric vehicle is in constant speed, acceleration or deceleration through the speed measurement region, F 1＝F2 is always true (because the data acquisition frequency of the sensor is high, the vehicle can be regarded as moving at constant speed in a short time, such as ms, and thus F 1＝F2), because the chassis fixing device at the wireless charging receiving end (such as 110 in fig. 2B) is made of the same material, and therefore the fixing device at the left end and the right end of the coil is affected by the magnetic field, and the micro deformation amount generated by the magnetic field should be the same, so that F 1-F2 =0.
In step S503, in a case where the difference is smaller than a set threshold, a stress to which the electric vehicle is subjected is determined based on the first micro stress and the second micro stress.
It will be appreciated that in practical applications, the difference between the first micro-stress and the second micro-stress is not necessarily 0, but there is an error due to measurement errors or the like. Therefore, in this embodiment, a threshold value (i.e. the set threshold value) may be preset, and after calculating the difference between the first micro-stress and the second micro-stress, the difference may be compared with the set threshold value, so as to determine the stress to which the electric vehicle is subjected based on the first micro-stress and the second micro-stress if the difference is smaller than the set threshold value.
It should be noted that, before the first micro-stress sensor and the second micro-stress sensor are used, the first micro-stress sensor and the second micro-stress sensor may be calibrated in advance, that is, when the automobile leaves the factory, the forces of the first micro-stress sensor and the second micro-stress sensor are equal, that is, the difference value of the micro-stress measured by the first micro-stress sensor and the second micro-stress sensor is approximately 0.
As can be seen from the foregoing description, in this embodiment, by acquiring the first micro stress detected by the first micro stress sensor and the second micro stress detected by the second micro stress sensor, and calculating the difference between the first micro stress and the second micro stress, and then determining the stress suffered by the electric vehicle based on the first micro stress and the second micro stress when the difference is smaller than the set threshold, it is possible to determine whether the wireless charging device is abnormal based on the difference between the first micro stress and the second micro stress, and further determine the stress suffered by the electric vehicle when it is determined that there is no abnormality, it is possible to improve accuracy in determining the stress received by the electric vehicle, and further improve accuracy in determining the speed of the electric vehicle based on the stress, and reduce the cost of the system based on realizing accurate speed measurement of the electric vehicle.
FIG. 6A is a flowchart illustrating how to determine the speed of the electric vehicle, according to an example embodiment; the present embodiment is exemplified on the basis of the above-described embodiments by taking as an example how the speed of the electric vehicle is determined. As shown in fig. 6A, the determining the speed of the electric vehicle based on the effective cutting length of the induction line in the magnetic field, the stress, and the field strength in the step 103 may include the following steps S601-S602:
in step S601, an acceleration of the electric vehicle is acquired.
In this embodiment, the acceleration of the electric vehicle may be detected by an accelerometer or other device mounted on the electric vehicle.
It should be noted that, in addition to the method of acquiring the acceleration of the electric vehicle by using the accelerometer, a person skilled in the art may also use other acceleration detection methods in the related art, and the obtained result is also applicable to the subsequent steps of the present embodiment, which is not limited in this embodiment.
In step S602, a speed of the electric vehicle is determined based on the effective cutting length, the stress, the field strength, a mass of the coil of the wireless charging receiving end, and the acceleration.
In this embodiment, after the acceleration of the electric vehicle is obtained, the speed of the electric vehicle may be determined based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end, and the acceleration.
For example, fig. 6B is a simplified model schematic diagram illustrating a speed measurement of an electric vehicle according to an exemplary embodiment. As shown in fig. 6B, the coil 601 of the wireless charging receiving end in the magnetic field with the field strength B moves leftwards on the metal guide rail 602, and the coil 601 performs the cutting magnetic induction line motion, so that the magnetic flux of the closed loop formed by the coil 601 and the metal guide rail 602 changes (the closed loop formed by the coil of the wireless charging receiving end and the conductor slide rail is equivalent to the wireless charging receiving closed loop), and the rightward force generated on the coil 601 prevents the movement of the coil of the wireless charging receiving end in order to prevent the magnetic flux from changing.
Assuming that the effective cut length of the coil 601 is L, a rightward force of BLV is generated, where V is the current vehicle speed. Specifically, according to the different driving states of the current automobile, the following cases may be corresponded:
First kind: f 1+F2 = BLV and F 1＝F2 when the current car passes through the speed measurement region at a constant speed;
Second kind: if the current automobile accelerates through the speed measuring area, F 1+F2 -BLV=ma, F 1＝F2, m are the mass of the coil associated with the microstress sensor, and a is the current automobile acceleration;
Third kind: when the current automobile is decelerated through the speed measuring region, F 1+F2 +blv=ma, and F 1＝F2, m is the mass of a coil associated with the microstress sensor, and a is the current automobile acceleration;
Wherein, F 1 and F 2 are respectively the pulling force or the pressure sensed by two micro stress sensors, and a is the acceleration of the automobile. It should be noted that, after the acceleration a of the automobile is obtained, it may be determined that the current automobile is at a constant speed, accelerating or decelerating based on the value of a, and then the current vehicle speed V may be estimated based on the above relational expression.
As can be seen from the above description, in this embodiment, by acquiring the acceleration of the electric vehicle and determining the speed of the electric vehicle based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end, and the acceleration, the speed of the electric vehicle can be determined based on the stress and the field intensity of the electric vehicle, and the speed measurement accuracy of the electric vehicle can be further improved by considering the current running state of the electric vehicle.
Fig. 7 is a flowchart showing how to determine the speed of the electric vehicle according to still another exemplary embodiment; the present embodiment is exemplified on the basis of the above-described embodiments by taking as an example how the speed of the electric vehicle is determined. As shown in fig. 7, the determining the speed of the electric vehicle in the step 602 based on the effective cutting length, the stress, the field strength, the mass of the coil of the wireless charging receiving end, and the acceleration may include the following steps S701-S702:
In step S701, a correction value of the acceleration of the electric vehicle is calculated based on the first speed of the electric vehicle at the present time and the second speed at the previous time.
It will be appreciated that the speed of the electric vehicle at each time may be determined by the method in the above embodiment, and thus the correction value of the acceleration of the electric vehicle may be calculated in the present embodiment based on the first speed of the electric vehicle at the current time and the second speed of the electric vehicle at the previous time.
In this embodiment, after determining the first speed of the electric vehicle at the current time, the correction value a School and school of the acceleration of the electric vehicle may be calculated using the following formula (3) based on the first speed and the second speed at the previous time:
a School and school ＝(V1-V2)/t (3)
Where V 1 and V 2 are the speeds at the current time and the previous time, respectively, and t is the interval between these two times (i.e., the interval of the system calculation cycle).
In step S702, a correction value for the speed of the electric vehicle is determined based on the effective cutting length, the stress, the field strength, the mass of the coil of the wireless charging receiving end, and the correction value for the acceleration.
In this embodiment, after calculating the correction value of the acceleration of the electric vehicle based on the first speed of the electric vehicle at the present time and the second speed of the electric vehicle at the previous time, the correction value of the speed of the electric vehicle may be determined based on the effective cutting length, the stress, the field strength, the mass of the coil of the wireless charging receiving end, and the correction value of the acceleration.
For example, after calculating the correction value a School and school of the acceleration of the electric vehicle, the correction value of the speed of the electric vehicle may be determined based on the formula (3) or the formula (4) in the embodiment shown in fig. 6A.
As can be seen from the foregoing description, in this embodiment, by calculating the correction value of the acceleration of the electric vehicle based on the first speed of the electric vehicle at the current time and the second speed of the electric vehicle at the previous time, and determining the correction value of the speed of the electric vehicle based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the correction value of the acceleration, the correction of the speed of the electric vehicle based on the correction value of the acceleration of the electric vehicle can be achieved, a more accurate speed is obtained, and the accuracy of the speed measurement of the electric vehicle can be further improved.
Fig. 8 is a flowchart illustrating a method of measuring a speed of a wireless charging electric car according to still another exemplary embodiment; the speed measuring method of the wireless charging electric automobile can be applied to wireless charging electric automobiles (such as new energy electric automobiles and the like). The coil of the wireless charging receiving end of the electric automobile is provided with a stress detection device and a magnetic force induction device. As shown in fig. 8, the method includes the following steps S801 to S804:
in step S801, the stress applied to the electric vehicle is obtained by using the stress detection device when the wireless charging receiving end is connected to the wireless charging transmitting end.
Wherein, wireless charging transmitting terminal sets up on the road surface.
In step S802, the magnetic induction device is used to obtain the field strength of the magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end.
In step S803, the speed of the electric vehicle is determined based on the effective cutting length of the magnetic induction line in the magnetic field, the stress, and the field strength.
The explanation and explanation of steps S801 to S803 can be referred to the above embodiments, and are not repeated here.
In step S804, the speed of the electric vehicle is sent to the service end of the traffic management department based on the wireless charging protocol.
In this embodiment, after determining the speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress, and the field intensity, the speed of the electric vehicle may be sent to a service end of a traffic management department based on a wireless charging protocol.
In an embodiment, the above wireless charging protocol may be set by a developer based on actual service requirements, which is not limited in this embodiment.
It should be noted that, in the related art, the speed measurement of the vehicle is measured by using a velocimeter on the road surface, and the traffic management department cannot directly obtain the speed measurement displayed by the automobile instrument panel from the vehicle, so the speed measurement displayed by the automobile instrument panel and the speed measurement during overspeed inspection of the traffic management department are two different sets of devices, and the embodiment can inform the road surface transmitting device of the current speed in real time through the wireless charging protocol packet, so that the road surface transmitting device can demodulate the speed information for the traffic management department, and further, the speed measurement result obtained by the traffic management department is the same as the speed measurement result displayed by the automobile instrument panel.
As can be seen from the above description, in this embodiment, the stress on the electric vehicle is obtained when the wireless charging receiving end is connected to the wireless charging transmitting end by using the stress detecting device, and the field intensity of the magnetic field where the electric vehicle is located is obtained when the wireless charging receiving end is connected to the wireless charging transmitting end by using the magnetic force sensing device, so that the speed of the electric vehicle is accurately determined based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the magnetic induction line cut by the wireless charging receiving end, the speed of the electric vehicle can be accurately determined, the cost of the system can be reduced, and not only the current speed of the electric vehicle per se can be obtained, but also the speed can be notified to the traffic management department for the traffic management department to better monitor and control the running of the vehicle based on the speed measurement.
Fig. 9 is a schematic diagram of an application scenario of a speed measurement method of a wireless charging electric vehicle according to an exemplary embodiment; as shown in fig. 9, a wireless charging transmitting end (not shown in the drawing) is paved in a testing area 300 on a road surface, and a wireless charging receiving end (not shown in the drawing) is installed on a chassis of an electric vehicle 400 to be tested, so that a wireless charging system of the electric vehicle is formed by the wireless charging transmitting end and the wireless charging receiving end. The wireless charging system can be used for charging a battery of the electric automobile and detecting the speed of the electric automobile. Specifically, when the electric automobile 400 travels in the speed measurement area, the wireless charging receiving end and the wireless charging transmitting end are relatively displaced, so that the magnetic flux passing through the wireless charging receiving end is changed, and a force obstructing the movement of the electric automobile 400 is generated on the coil of the wireless charging receiving end, namely, the electric automobile 400 is stressed, the stress borne by the electric automobile 400 is obtained by using the stress detection device, the field intensity of the magnetic field where the electric automobile 400 is located is obtained by using the magnetic force induction device, and the speed of the electric automobile 400 can be determined based on the effective cutting length (namely, the length of the coil of the wireless charging receiving end) of the magnetic induction line in the cutting magnetic field of the wireless charging receiving end, the stress and the field intensity.
Fig. 10 is a block diagram illustrating a speed measuring device of a wireless charging electric car according to an exemplary embodiment; the speed measuring device of the wireless charging electric automobile of the embodiment can be applied to wireless charging electric automobiles (such as new energy electric automobiles and the like). The coil of the wireless charging receiving end of the electric automobile is provided with a stress detection device and a magnetic force induction device. As shown in fig. 10, the apparatus includes: a stress acquisition module 110, a field strength acquisition module 120, and a speed determination module 130, wherein:
The stress acquisition module 110 is configured to acquire stress applied to the electric vehicle when the wireless charging receiving end is connected to a wireless charging transmitting end by using the stress detection device, where the wireless charging transmitting end is disposed on a road surface;
The field intensity obtaining module 120 is configured to obtain, by using the magnetic induction device, a field intensity of a magnetic field where the electric vehicle is located when the wireless charging receiving end is connected to the wireless charging transmitting end;
The speed determining module 130 is configured to determine a speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress, and the field intensity of the wireless charging receiving end.
As can be seen from the above description, in this embodiment, the stress on the electric vehicle is obtained when the wireless charging receiving end is connected to the wireless charging transmitting end by using the stress detection device, and the field intensity of the magnetic field where the electric vehicle is located is obtained when the wireless charging receiving end is connected to the wireless charging transmitting end by using the magnetic force sensing device, so that the speed of the electric vehicle is determined based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the magnetic induction line cut by the wireless charging receiving end, and the speed of the electric vehicle can be accurately determined.
Fig. 11 is a block diagram illustrating a speed measuring device of a wireless charging electric car according to still another exemplary embodiment; the speed measuring device of the wireless charging electric automobile of the embodiment can be applied to wireless charging electric automobiles (such as new energy electric automobiles and the like). A stress detection device and a magnetic force induction device are arranged on a coil of a wireless charging receiving end of the electric automobile. The functions of the stress obtaining module 210, the field strength obtaining module 220, and the speed determining module 230 are the same as those of the stress obtaining module 110, the field strength obtaining module 120, and the speed determining module 130 in the embodiment shown in fig. 10, and are not described herein.
As shown in fig. 11, the magnetic induction device may include a first magnetometer and a second magnetometer, where the installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the coil center of the wireless charging receiving terminal;
the field strength acquisition module 220 may include:
a magnetic force value obtaining unit 221, configured to obtain a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
The field strength determining unit 222 is configured to determine the field strength of the magnetic field where the electric vehicle is located based on the first magnetic force value and the second magnetic force value.
In an embodiment, the field strength determination unit 222 may be further configured to:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located.
In one embodiment, the stress detection device comprises a first micro stress sensor and a second micro stress sensor;
The stress acquisition module 210 includes:
A micro stress acquisition unit 211, configured to acquire a first micro stress detected by the first micro stress sensor and a second micro stress detected by the second micro stress sensor;
The stress determining unit 212 is configured to determine a stress to which the electric vehicle is subjected based on the first micro stress and the second micro stress.
In an embodiment, the stress acquisition module 210 may further include:
a difference calculating unit 213 for calculating a difference between the first micro stress and the second micro stress;
The stress determining unit 212 may be further configured to perform the operation of determining the stress to which the electric vehicle is subjected based on the first micro stress and the second micro stress, in a case where the difference is smaller than a set threshold.
In one embodiment, the speed determination module 230 may include:
an acceleration acquisition unit 231 for acquiring an acceleration of the electric vehicle;
A speed determining unit 232, configured to determine a speed of the electric vehicle based on the effective cutting length, the stress, the field strength, a mass of the coil of the wireless charging receiving end, and the acceleration.
In an embodiment, the speed determining unit 232 may be further configured to:
Calculating a correction value of acceleration of the electric vehicle based on a first speed of the electric vehicle at a current time and a second speed of the electric vehicle at a previous time;
and determining a correction value of the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the correction value of the acceleration.
In an embodiment, the apparatus may further include:
The speed sending module 240 is configured to send the speed of the electric vehicle to a service end of a traffic management department based on a wireless charging protocol.
On the other hand, the embodiment also provides a speed measuring system of the wireless charging electric automobile, which comprises a wireless charging transmitting end arranged on a road surface and a wireless charging receiving end arranged on the electric automobile; the electric automobile comprises a speed determining device, and a stress detecting device and a magnetic force sensing device are arranged on a coil of the wireless charging receiving end;
The stress detection device is used for acquiring stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end;
The magnetic force induction device is used for acquiring the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end;
the speed determining device is used for determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 12 is a block diagram of an electronic device, according to an example embodiment. For example, device 900 may be a mobile phone, computer, digital broadcast terminal, messaging device, game console, tablet device, medical device, exercise device, personal digital assistant, and the like.
Referring to fig. 12, device 900 may include one or more of the following components: a processing component 902, a memory 904, a power component 906, a multimedia component 908, an audio component 910, an input/output (I/O) interface 912, a sensor component 914, and a communication component 916.
The processing component 902 generally controls overall operation of the device 900, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing element 902 may include one or more processors 920 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 902 can include one or more modules that facilitate interaction between the processing component 902 and other components. For example, the processing component 902 can include a multimedia module to facilitate interaction between the multimedia component 908 and the processing component 902.
The memory 904 is configured to store various types of data to support operations at the device 900. Examples of such data include instructions for any application or method operating on device 900, contact data, phonebook data, messages, pictures, videos, and the like. The memory 904 may be implemented by any type of volatile or nonvolatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power component 906 provides power to the various components of the device 900. Power components 906 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for device 900.
The multimedia component 908 comprises a screen between the device 900 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 908 includes a front-facing camera and/or a rear-facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 900 is in an operational mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 910 is configured to output and/or input audio signals. For example, the audio component 910 includes a Microphone (MIC) configured to receive external audio signals when the device 900 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 904 or transmitted via the communication component 916. In some embodiments, the audio component 910 further includes a speaker for outputting audio signals.
The I/O interface 912 provides an interface between the processing component 902 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 914 includes one or more sensors for providing status assessment of various aspects of the device 900. For example, the sensor assembly 914 may detect the on/off state of the device 900, the relative positioning of the components, such as the display and keypad of the device 900, the sensor assembly 914 may also detect the change in position of the device 900 or one component of the device 900, the presence or absence of user contact with the device 900, the orientation or acceleration/deceleration of the device 900, and the change in temperature of the device 900. The sensor assembly 914 may also include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 914 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 914 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 916 is configured to facilitate communication between the device 900 and other devices, either wired or wireless. The device 900 may access a wireless network based on a communication standard, such as WiFi,2G or 3G,4G or 5G, or a combination thereof. In one exemplary embodiment, the communication part 916 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 916 further includes a Near Field Communication (NFC) module to facilitate short range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 900 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for performing the above-described speed measurement method for a wireless charging electric vehicle.
In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as a memory 904 including instructions executable by the processor 920 of the device 900 to perform the above-described method of speed measurement of a wirelessly charged electric vehicle. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (11)

1. The speed measuring method of the wireless charging electric automobile is characterized in that a stress detection device and a magnetic force induction device are arranged on a coil of a wireless charging receiving end of the electric automobile, the stress detection device comprises a first micro stress sensor and a second micro stress sensor, the magnetic force induction device comprises a first magnetometer and a second magnetometer, and installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the center of the coil of the wireless charging receiving end;
The method comprises the following steps:
The stress detection device is utilized to obtain the stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end, and the wireless charging transmitting end is arranged on a road surface;
The magnetic force induction device is utilized to acquire the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end;
Determining the speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end;
the method for acquiring the field intensity of the magnetic field of the electric automobile by using the magnetic induction device when the wireless charging receiving end is connected with the wireless charging transmitting end comprises the following steps:
Acquiring a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
determining the field intensity of a magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value;
the determining the field intensity of the magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value comprises the following steps:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located;
The step of obtaining the stress suffered by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end by using the stress detection device comprises the following steps:
acquiring first micro stress detected by the first micro stress sensor and second micro stress detected by the second micro stress sensor;
determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress;
The method further comprises the steps of:
calculating a difference between the first micro-stress and the second micro-stress;
and executing the operation of determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress under the condition that the difference value is smaller than a set threshold value.
2. The method of claim 1, wherein the determining the speed of the electric vehicle based on the effective cutting length of the line of magnetic induction in the magnetic field, the stress, and the field strength of the wireless charging receiver comprises:
acquiring acceleration of the electric automobile;
And determining the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the acceleration.
3. The method of claim 2, wherein the determining the speed of the electric vehicle based on the effective cutting length, the stress, the field strength, the mass of the coil of the wireless charging receiver, and the acceleration comprises:
Calculating a correction value of acceleration of the electric vehicle based on a first speed of the electric vehicle at a current time and a second speed of the electric vehicle at a previous time;
and determining a correction value of the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the correction value of the acceleration.
4. The method according to claim 1, wherein the method further comprises:
And sending the speed of the electric automobile to a service end of a traffic management department based on a wireless charging protocol.
5. The device is characterized in that a stress detection device and a magnetic force induction device are arranged on a coil of a wireless charging receiving end of the electric automobile, the magnetic force induction device comprises a first magnetometer and a second magnetometer, the stress detection device comprises a first micro stress sensor and a second micro stress sensor, and the installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the center of the coil of the wireless charging receiving end;
The device comprises:
The stress acquisition module is used for acquiring stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end by using the stress detection device, and the wireless charging transmitting end is arranged on a road surface;
the field intensity acquisition module is used for acquiring the field intensity of the magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end by utilizing the magnetic force induction device;
the speed determining module is used for determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end;
The field intensity acquisition module comprises:
The magnetic force value acquisition unit is used for acquiring a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
The field intensity determining unit is used for determining the field intensity of the magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value;
the field strength determination unit is further configured to:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located;
the stress acquisition module comprises:
The micro stress acquisition unit is used for acquiring the first micro stress detected by the first micro stress sensor and the second micro stress detected by the second micro stress sensor;
The stress determining unit is used for determining the stress born by the electric automobile based on the first micro stress and the second micro stress;
the stress acquisition module further comprises:
A difference calculating unit for calculating a difference between the first micro stress and the second micro stress;
The stress determination unit is further configured to perform the operation of determining the stress to which the electric vehicle is subjected based on the first micro stress and the second micro stress, in a case where the difference is smaller than a set threshold.
6. The apparatus of claim 5, wherein the speed determination module comprises:
An acceleration acquisition unit for acquiring the acceleration of the electric automobile;
And the speed determining unit is used for determining the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the acceleration.
7. The apparatus of claim 6, wherein the speed determination unit is further configured to:
Calculating a correction value of acceleration of the electric vehicle based on a first speed of the electric vehicle at a current time and a second speed of the electric vehicle at a previous time;
and determining a correction value of the speed of the electric automobile based on the effective cutting length, the stress, the field intensity, the mass of the coil of the wireless charging receiving end and the correction value of the acceleration.
8. The apparatus of claim 5, wherein the apparatus further comprises:
And the speed sending module is used for sending the speed of the electric automobile to a service end of a traffic management department based on a wireless charging protocol.
9. The speed measuring system of the wireless charging electric automobile is characterized by comprising a wireless charging transmitting end arranged on a road surface and a wireless charging receiving end arranged on the electric automobile; the electric automobile comprises a speed determining device, wherein a stress detecting device and a magnetic force sensing device are arranged on a coil of the wireless charging receiving end, the magnetic force sensing device comprises a first magnetometer and a second magnetometer, the stress detecting device comprises a first micro stress sensor and a second micro stress sensor, and the installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the center of the coil of the wireless charging receiving end;
The stress detection device is used for acquiring stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end;
The magnetic force induction device is used for acquiring the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end;
the speed determining device is used for determining the speed of the electric automobile based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end;
the magnetic force induction device is also used for:
Acquiring a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
determining the field intensity of a magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value;
the magnetic force induction device is also used for:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located;
the stress detection device is also used for:
acquiring first micro stress detected by the first micro stress sensor and second micro stress detected by the second micro stress sensor;
determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress;
the stress detection device is also used for:
calculating a difference between the first micro-stress and the second micro-stress;
and executing the operation of determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress under the condition that the difference value is smaller than a set threshold value.
10. The speed measuring equipment of the wireless charging electric automobile is characterized in that a stress detection device and a magnetic force induction device are arranged on a coil of a wireless charging receiving end of the electric automobile, the magnetic force induction device comprises a first magnetometer and a second magnetometer, the stress detection device comprises a first micro stress sensor and a second micro stress sensor, and the installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the center of the coil of the wireless charging receiving end;
The speed measuring apparatus includes:
A processor and a memory for storing processor-executable instructions;
wherein the processor is configured to:
The stress detection device is utilized to obtain the stress born by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end, and the wireless charging transmitting end is arranged on a road surface;
The magnetic force induction device is utilized to acquire the field intensity of a magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end;
Determining the speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end;
the method for acquiring the field intensity of the magnetic field of the electric automobile by using the magnetic induction device when the wireless charging receiving end is connected with the wireless charging transmitting end comprises the following steps:
Acquiring a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
determining the field intensity of a magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value;
the determining the field intensity of the magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value comprises the following steps:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located;
The step of obtaining the stress suffered by the electric automobile when the wireless charging receiving end is connected with the wireless charging transmitting end by using the stress detection device comprises the following steps:
acquiring first micro stress detected by the first micro stress sensor and second micro stress detected by the second micro stress sensor;
determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress;
Further comprises:
calculating a difference between the first micro-stress and the second micro-stress;
and executing the operation of determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress under the condition that the difference value is smaller than a set threshold value.
11. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor performs the steps of:
The method comprises the steps that stress born by an electric automobile is obtained when a wireless charging receiving end is connected with a wireless charging transmitting end by using a stress detection device, the wireless charging transmitting end is arranged on a road surface, and the stress detection device comprises a first micro stress sensor and a second micro stress sensor;
The method comprises the steps that when a wireless charging receiving end is connected with a wireless charging sending end, the magnetic induction device is used for obtaining the field intensity of a magnetic field where an electric automobile is located, the magnetic induction device comprises a first magnetometer and a second magnetometer, and the installation positions of the first magnetometer and the second magnetometer are symmetrical with respect to the center of a coil of the wireless charging receiving end;
Determining the speed of the electric vehicle based on the effective cutting length of the magnetic induction line in the magnetic field, the stress and the field intensity of the wireless charging receiving end;
The magnetic induction device is used for acquiring the field intensity of the magnetic field where the electric automobile is located when the wireless charging receiving end is connected with the wireless charging transmitting end, and the magnetic induction device comprises:
Acquiring a first magnetic force value detected by the first magnetometer and a second magnetic force value detected by the second magnetometer;
determining the field intensity of a magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value;
the determining the field intensity of the magnetic field where the electric automobile is located based on the first magnetic force value and the second magnetic force value comprises the following steps:
acquiring a distance between the first magnetometer and the second magnetometer;
substituting the first magnetic force value, the second magnetic force value and the distance into a predetermined field intensity calculation function to obtain the field intensity of the magnetic field where the electric automobile is located;
The stress that utilizes stress detection device to obtain electric automobile when wireless receiving end and wireless sending end that charges link to each other includes:
acquiring first micro stress detected by the first micro stress sensor and second micro stress detected by the second micro stress sensor;
determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress;
Further comprises:
calculating a difference between the first micro-stress and the second micro-stress;
and executing the operation of determining the stress to which the electric automobile is subjected based on the first micro stress and the second micro stress under the condition that the difference value is smaller than a set threshold value.
CN202010514118.1A 2020-06-08 2020-06-08 Speed measuring method, device and equipment for wireless charging electric automobile and storage medium Active CN113834949B (en)

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