TW201638839A - Calibration system and calibration method for induction key - Google Patents

Abstract

A calibration system applied for induction key can include a signal source and a computing device. The signal source can be configured to generate low-frequency signal and magnetic field. The induction key can be configured to receive and transmit the low-frequency signal and the magnetic field information to the computing device. The computing device can be configured to achieving a strength value of the magnetic field from the magnetic field information, and generate an error compensation algorithm via the strength value of the magnetic field and a standard strength value of the magnetic field. The computing device can be further configured to transmit the error compensation algorithm to the induction key. The induction key can be capable of correcting a new arriving strength value of the magnetic field via the error compensation algorithm, when the induction key receives the new arriving strength value of the magnetic field.

Description

Induction key correction system and correction method

The invention relates to an inductive key correction system and a calibration method.

Based on the improvement of people's requirements for car safety protection, PKE (Passive Keyless Entry) technology came into being. In the previous PEK system, the driver needed to remotely open and lock the door through buttons. With the new PKE system, the driver did not need to perform any operation, and only needed to carry a sensor key with him.

When the driver enters the specified range, the PEK sensor can sense the low-frequency low-frequency signal emitted by the car, and the low-frequency signal is authenticated and sent back to the car through the UHF high-frequency signal transmitter to realize the functions of opening and closing the door. In order to ensure that the battery life of the PKE sensor key is not excessively consumed in a short time, it can only be awakened when it receives a low frequency low frequency signal with sufficient magnetic field strength. Therefore, the sensing key is particularly important for the stability and accuracy of the low-frequency signal magnetic field. However, due to the influence of the hardware design structure, the magnetic field sensing of the PKE sensing key often deviates, resulting in unstable low-frequency signal to the car. , a misoperation occurred.

In view of the above, it is necessary to provide an inductive key correction system and a correction method to improve the accuracy and stability of the induction key to the signal.

An inductive key correction system is applied to an inductive key, a signal source, and an arithmetic device; the inductive key includes a first storage unit, a low frequency receiving unit, a high frequency transmitting unit, and a processing unit; and the signal source includes a second storage unit And the low-frequency transmitting unit; the computing device includes a third storage unit, a transmitting unit, and an arithmetic unit, wherein the third storage unit presets a first standard magnetic field strength and a second standard magnetic field strength; the inductive key correction system includes:

a low frequency transmission control module, configured to control the low frequency transmitting unit to sequentially transmit a first low frequency signal and a second low frequency signal, wherein the first low frequency signal includes the first standard magnetic field strength value, and the second low frequency signal includes the a second standard magnetic field strength value; the first standard magnetic field strength value is different from the second standard magnetic field strength value; the sensing key sequentially receives the first low frequency signal and the second low frequency signal, and identifies and receives The magnetic field strength of the first low frequency signal is the first received magnetic field strength value, and the magnetic field strength of the received second low frequency signal is the second received magnetic field strength value;

a high frequency emission control module, configured to control the high frequency transmitting unit to sequentially transmit the first high frequency signal and the second high frequency signal, wherein the first high frequency signal and the second high frequency signal respectively comprise the first Receiving a magnetic field strength value and the second received magnetic field strength value;

An analysis operation module, configured to control the operation unit to sequentially read the first standard magnetic field strength value and the first received magnetic field strength value, and the second standard magnetic field strength value and the second received magnetic field strength value And calculating an error compensation algorithm required to compensate for an error between the received magnetic field strength value received by the low frequency receiving unit and the standard magnetic field strength value emitted by the low frequency transmitting unit;

a correction module, configured to control the transmission unit to send the compensation algorithm to the induction key to allow the induction key to receive the received magnetic field strength by using the compensation algorithm when receiving the next low frequency signal The value is compensated;

The low frequency transmission control module is further configured to control the low frequency transmitting unit to continue transmitting another low frequency signal when determining that the error does not fall within a predetermined error range, to allow the inductive key correction system to The smart key is corrected until the error falls within the preset error range.

An inductive key correction method is applied to an inductive key, a signal source, and an arithmetic device; the inductive key includes a first storage unit, a low frequency receiving unit high frequency transmitting unit, and a processing unit; the signal source includes a second storage unit and a low frequency transmitting unit; the computing device includes a third storage unit, a transmitting unit, and an arithmetic unit, wherein the third storage unit presets a first standard magnetic field strength, a second standard magnetic field strength, and a third standard magnetic field strength; The key correction method includes the steps:

Controlling the low frequency transmitting unit to transmit a first low frequency signal, the first low frequency signal including the first standard magnetic field strength value; the sensing key receiving the first low frequency signal and identifying the first low frequency received The magnetic field strength of the signal is the first received magnetic field strength value;

Controlling the high frequency transmitting unit to transmit a first high frequency signal, the first high frequency signal including the first received magnetic field strength value;

Controlling the communication unit to receive the first high frequency signal;

Controlling the operation unit to read the first standard magnetic field strength value and the first received magnetic field strength value, and calculating a first difference between the first standard magnetic field strength value and the first received magnetic field strength value ;

Determining, if the first difference does not fall within a predetermined error range, controlling the low frequency transmitting unit to transmit a second low frequency signal, the second low frequency signal including the second standard magnetic field strength value; The second standard magnetic field strength value is different from the first standard magnetic field strength value; the induction key receives the second low frequency signal and identifies the received magnetic field strength of the second low frequency signal as a second received magnetic field strength value ;

Controlling the high frequency transmitting unit to transmit a second high frequency signal, the second high frequency signal including the second received magnetic field strength value;

Controlling the communication unit to receive the second high frequency signal;

Controlling, by the operation unit, the second standard magnetic field strength value and the second received magnetic field strength value, and calculating a compensation received magnetic field strength value received by the low frequency receiving unit and the low frequency transmitting unit The error compensation algorithm required for the error between the standard magnetic field strength values;

Controlling the transmission unit to send the compensation algorithm to the inductive key;

Controlling the low frequency transmitting unit to transmit a third low frequency signal, the third low frequency signal including the third standard magnetic field strength value; the sensing key receiving the third low frequency signal and identifying the received third low frequency signal The magnetic field strength is a third received magnetic field strength value;

Controlling, by the processing unit, recalculating the third received magnetic field strength value by using the mapping function relationship to obtain an approximate standard magnetic field strength value;

Controlling the high frequency transmitting unit to emit a third high frequency signal, the third high frequency signal including the scaled standard magnetic field strength value;

Controlling the operation unit to read the third standard magnetic field strength value and the approximate standard magnetic field strength value, and calculating a second difference between the third standard magnetic field strength value and the approximate standard magnetic field strength value;

Determining, if the second difference does not fall within the preset error tolerance range, continuing the correcting step until the first difference or the second difference falls within the preset error tolerance range.

The inductive key correction system and the calibration method of the invention use the signal source to sequentially transmit the second low frequency signal and simultaneously generate the magnetic field of the corresponding intensity, and the induction key sends the second received magnetic field information to the computing device to compare with the standard value of the magnetic field strength. The calculation results in a mapping function relationship for correction. When the signal source again emits a magnetic field, the correction system allows the sensing key to obtain the corrected magnetic field strength according to the mapping function relationship, thereby improving the accuracy and stability of the sensing key to the signal sensing. Sex.

1 is a functional block diagram of an inductive key correction system according to an embodiment of the present invention.

2 is a functional block diagram of an operating environment of a vehicle-sensing key correction system according to an embodiment of the present invention.

3 and 4 are flowcharts of a method for correcting an inductive key according to an embodiment of the present invention.

Referring to FIG. 1 and FIG. 2 together, FIG. 1 is a functional block diagram of an inductive key correction system S1. The inductive key correction system S1 operates in the signal source 10, the computing device 20, and the inductive key 300 shown in FIG. The sensor key 300 has a storage and calculation function. The sensor key correction system S1 is used to correct the external signal received by the sensor key 300 to improve the stability and accuracy of the sensor key 300 for magnetic field sensing.

Specifically, the inductive key 300 is capable of receiving an external signal transmitted by the signal source 10 and identifying the strength of the external signal, the signal strength and inductance of the signal source 10 being transmitted during transmission and reception. There may be a certain error value between the signal strengths received by the key 300. The inductive key correction system S1 controls the arithmetic device 20 to detect and calculate the error value, and compensates for the signal strength received by the inductive key 300. The inductive key 300 is capable of accurately sensing the strength of a signal transmitted by the signal source 10.

The inductive key correction system S1 includes a low frequency transmission control module 102, a high frequency emission control module 104, an analysis operation module 106, and a correction module 108.

The low frequency emission control module 102 is configured to control the signal source 10 to transmit a low frequency signal to the inductive key 300, the low frequency signal including magnetic field strength value information. The high frequency emission control module 104 is configured to control the inductive key 300 to transmit a high frequency signal to the computing device 20, the high frequency signal including magnetic field strength value information of the low frequency signal received by the inductive key 300. The analysis operation module 106 is configured to calculate an error value between the magnetic field strength of the low frequency signal emitted by the analysis signal source 10 and the magnetic field strength of the low frequency signal received by the induction key 300. The correction module 108 is configured to send the magnetic field strength error compensation algorithm or the magnetic field strength error compensation value required to cancel the error value to the induction key 300.

In the present embodiment, the inductive key 300 includes a first storage unit 302, a low frequency receiving unit 304, a high frequency transmitting unit 306, and a processing unit 308.

The processing unit 308 is configured to provide an arithmetic function for the inductive key 300. The first storage unit 302 is configured to provide a storage function for the inductive key 300 and to store the high frequency emission control module 104. The low frequency receiving unit 304 is configured to sense a low frequency signal around the inductive key 300 and activate the inductive key 300 to receive the low frequency signal, the low frequency signal including a magnetic field strength value. The high frequency transmitting unit 306 is configured to transmit a high frequency signal to the computing device 20, wherein the high frequency signal includes a magnetic field strength value of the low frequency signal received by the low frequency receiving unit 304.

The signal source 10 includes a second storage unit 11, a low frequency transmitting unit 13, and a Helmholtz coil 15 connected to the low frequency transmitting unit 13.

The second storage unit 11 is for providing a storage function for the signal source 10 and for storing the low frequency transmission control module 102. The low frequency transmitting unit 13 is for intermittently generating a low frequency signal and outputting a corresponding voltage to the Helmholtz coil 15. The Helmholtz coil 15 is connected to the low frequency transmitting unit 13 to produce a uniform standard magnetic field, so that the low frequency transmitting unit 13 emits a low frequency signal to the periphery to allow the low frequency receiving unit 304 of the inductive key 300 to receive. The low frequency signal comprises a standard magnetic field strength of the standard magnetic field. In the present embodiment, the inductive key 300 is placed near the center of the axis of the Helmholtz coil 15, and the low frequency signal and the magnetic field signal can be sensed by the inductive key 300 to activate the inductive key 300 to make the inductive key 300 low frequency. The receiving unit 304 receives the low frequency signal, thereby allowing the high frequency transmitting unit 306 to transmit the high frequency signal, wherein the high frequency signal includes a magnetic field strength value of the low frequency signal received by the low frequency receiving unit 304.

The arithmetic device 20 includes a third storage unit 201, a transmission unit 202, and an operation unit 204. The computing device 20 can be an electronic device such as a computer or a mobile phone, or can be an arithmetic program integrated in the inductive key 300.

The third storage unit 201 is configured to provide a storage function for the computing device 20 and to store the analysis computing module 106 and the calibration module 108. In the present embodiment, before the correction key 300 performs correction, the third storage unit 201 stores in advance the magnetic field strength standard value of the magnetic field generated by the signal source 10. The transmission unit 202 establishes wireless communication with the high frequency transmitting unit 306 of the inductive key 300 for receiving the high frequency signal transmitted by the inductive key 300, and is used for calculating the error compensation algorithm or error compensation value calculated by the computing device 20. Send to the sensor key 300. In the present embodiment, the transmission unit 202 is a UHF high frequency signal transmitter/receiver. The operation unit 204 is configured to obtain a magnetic field strength value of the low frequency signal received by the low frequency receiving unit 304 from the high frequency signal transmitted by the high frequency transmitting unit 306 of the inductive key 300, and prestore the magnetic field strength value in the third storage unit 201. The magnetic field strength standard value is compared to obtain an error compensation algorithm required to eliminate the error between the magnetic field strength value and the magnetic field strength standard value.

Referring again to FIG. 1, each module of the inductive key correction system S1 is stored in the first storage unit 302 or/and the second storage unit 11 or/and the third storage unit 201, and may be used by the first storage unit 302 or / And a programmable module executed by the second storage unit 11 or/and the third storage unit 201. In the present embodiment, the low frequency emission control module 102 is stored in the second storage unit 11 and can be executed by the low frequency transmitting unit 13; the high frequency emission control module 104 and the correction module 108 are stored in the first storage unit 302 and can be The high frequency transmitting unit 306 executes; the analysis operation module 106 is stored in the third storage unit 201 and can be executed by the arithmetic unit 204.

The program execution of each of the above modules is as follows:

The low frequency emission control module 102 controls the low frequency transmitting unit 13 of the signal source 10 to emit the first low frequency signal, while the Helmholtz coil 15 connected to the low frequency transmitting unit 13 emits a magnetic field, so that the first low frequency signal includes the first transmitting magnetic field strength. a value, the first transmitted magnetic field strength value being a first standard magnetic field strength value.

The low frequency receiving unit 304 of the inductive key 300 receives the first low frequency signal and identifies the magnetic field strength value of the first low frequency signal it receives. The magnetic field strength value of the first low frequency signal received by the low frequency receiving unit 304 is a first received magnetic field strength value.

The high frequency emission control module 104 controls the high frequency transmitting unit 306 of the inductive key 300 to transmit a first high frequency signal to the computing device 20, the first high frequency signal including the first received magnetic field strength value.

The first standard magnetic field strength value is prestored in the third storage unit 201 of the computing device 20. The transmission unit 202 of the computing device 20 receives the first high frequency signal and obtains the first received magnetic field strength value from the first high frequency signal. The analysis operation module 106 controls the operation unit 204 to read the first standard magnetic field strength value and the first received magnetic field strength value, and calculate a difference between the first received magnetic field strength value and the first standard magnetic field strength value value. If it is judged that the difference is zero or falls within the allowable error range, the sensing sensitivity of the sensing key 300 meets the requirements, and no correction is required, and the flow ends. If the difference does not fall within the tolerance of the error, then the sensor key 300 needs to continue to be corrected.

The low frequency emission control module 102 again controls the low frequency transmitting unit 13 of the signal source 10 to emit a second low frequency signal, while the Helmholtz coil 15 connected to the low frequency transmitting unit 13 emits a magnetic field, so that the second low frequency signal includes the second emission. a magnetic field strength value, the second emitted magnetic field strength value being a second standard magnetic field strength value, the second standard magnetic field strength value being different from the first standard magnetic field strength value.

The low frequency receiving unit 304 of the inductive key 300 receives the second low frequency signal and identifies the magnetic field strength value of the second low frequency signal it receives. The magnetic field strength value of the second low frequency signal received by the low frequency receiving unit 304 is a second received magnetic field strength value.

The high frequency emission control module 104 controls the high frequency transmitting unit 306 of the inductive key 300 to transmit a second high frequency signal to the computing device 20, the second high frequency signal including the second received magnetic field strength value.

The second standard magnetic field strength value is prestored in the third storage unit 201 of the computing device 20. The transmission unit 202 of the arithmetic device 20 receives the second high frequency signal and acquires the second received magnetic field strength value from the second high frequency signal. The analysis operation module 106 controls the operation unit 204 to read the second standard magnetic field strength value and the second received magnetic field strength value, and calculate a difference between the second received magnetic field strength value and the second standard magnetic field strength value value.

The analysis operation module 106 controls the operation unit 204 to establish a first functional relationship and a second functional relationship, wherein the first functional relationship is a linear function relationship between the first standard magnetic field strength value and the second standard magnetic field strength value. The second functional relationship is a linear function relationship between the first received magnetic field strength value and the second received magnetic field strength value.

The operation unit 204 continues the calculation to establish a mapping function relationship between the first functional relationship and the second functional relationship. When the mapping function relationship is applied to the second functional relationship, the first received magnetic field strength value and the second received magnetic field strength value may be converted to infinitely approximate the first standard magnetic field strength respectively after being converted. And a value of the second standard magnetic field strength. In other words, the first received magnetic field strength value can obtain a first approximate standard magnetic field strength value after applying the mapping function relationship, and the first approximate standard magnetic field strength value is compared with the first received magnetic field strength value. More similar to the first standard magnetic field strength value; the second received magnetic field strength value, after applying the mapping function relationship, can obtain a second approximate standard magnetic field strength value, and the second approximate standard magnetic field strength value The second standard magnetic field strength value is closer to the second received magnetic field strength value. It can be understood that the first approximate standard magnetic field strength value and the second approximate standard magnetic field strength value may respectively infinitely approach the first standard magnetic field strength value and the second standard magnetic field strength value. In this embodiment, the mapping function relationship is determined by an offset and a slope difference of the first functional relationship with respect to the second functional relationship.

The correction module 108 controls the transmission unit 202 to transmit and store the mapping function relationship into the first storage unit 302 of the inductive key 300.

The low frequency emission control module 102 again controls the low frequency transmitting unit 13 of the signal source 10 to emit a third low frequency signal, while the Helmholtz coil 15 connected to the low frequency transmitting unit 13 emits a magnetic field, so that the third low frequency signal includes the third emission. A magnetic field strength value, the third emission magnetic field strength value being a third standard magnetic field strength value.

The low frequency receiving unit 304 of the inductive key 300 receives the third low frequency signal and identifies the magnetic field strength value of the third low frequency signal it receives. The magnetic field strength value of the third low frequency signal received by the low frequency receiving unit 304 is a third received magnetic field strength value.

The processing unit 308 of the inductive key 300 recalculates the third received magnetic field strength value by applying the mapping function relationship to obtain a third approximate standard magnetic field strength value. The high frequency transmitting unit 306 transmits a third high frequency signal to the computing device 20, the third high frequency signal including the third approximate standard magnetic field strength value.

The third standard magnetic field strength value is prestored in the third storage unit 201 of the computing device 20. The transmission unit 202 of the computing device 20 receives the third high frequency signal and obtains the third approximate standard magnetic field strength value from the third high frequency signal. The analysis operation module 106 controls the operation unit 204 to read the third standard magnetic field strength value and the third approximate standard magnetic field strength value, and calculate the third approximate standard magnetic field strength value and the third standard magnetic field strength value The difference. If the difference is within the error tolerance range, the above-mentioned calibration process ends, and if the difference does not fall within the error tolerance range, the above-described inductive key correction process is repeated.

The inductive key correction system S1 of the embodiment of the present invention can be applied to the production of the inductive key 300, and the magnetic field strength compensation is performed on the signal received by the inductive key 300 by the mapping function relationship, thereby improving the sensitivity of the inductive key 300. It can be understood that the inductive key correction system S1 can also be applied to the quality detection or maintenance of the inductive key 300.

Even the inductive key correction system S1 can be applied to a vehicle control system. In particular, the signal source 10 can be disposed on a vehicle, and the computing device 20 can be integrated into the inductive key 300, can be disposed on the vehicle, or can be integrated into the signal source 10. When the user finds that the sensitivity of the inductive key 300 is degraded, the inductive key correction system S1 can be activated, and a new mapping function relationship is obtained by using the above correction process, and the inductive key 300 is recalibrated to improve the sensing sensitivity. After the sensor key 300 is corrected, the magnetic field strength of the received low frequency signal is first compensated and calculated, and then the next step is performed according to the compensated magnetic field strength. For example, if the compensated magnetic field strength falls within a predetermined range, the inductive key 300 can control the opening or closing of the vehicle door. Therefore, the sensitivity of the inductive key 300 using the inductive key correction system S1 is high, and it is possible to prevent erroneous operation due to the magnetic field strength error received.

Referring to FIG. 3 and FIG. 4, FIG. 3 and FIG. 4 are flowcharts showing an inductive key correction method according to an embodiment of the present invention. The method for correcting the sensing key includes the following steps:

Step S101: The signal source 10 transmits a first low frequency signal, the first low frequency signal includes a first standard magnetic field strength value, and the inductive key 300 receives the first low frequency signal. Specifically, the low frequency transmission control module 102 controls the low frequency transmitting unit 13 of the signal source 10 to transmit the first low frequency signal, the first low frequency signal includes a first standard magnetic field strength value; and the low frequency receiving unit 304 of the inductive key 300 receives the The first low frequency signal and identifying the magnetic field strength value of the first low frequency signal it receives. The magnetic field strength value of the first low frequency signal received by the low frequency receiving unit 304 is a first received magnetic field strength value.

Step S103: The induction key 300 transmits a first high frequency signal to the computing device 20, the first high frequency signal including the first received magnetic field strength value, and the computing device 20 receiving the first high frequency signal. Specifically, the high frequency emission control module 104 controls the high frequency transmitting unit 306 of the inductive key 300 to transmit the first high frequency signal to the computing device 20, the first high frequency signal including the first received magnetic field strength value. The transmission unit 202 of the computing device 20 receives the first high frequency signal and obtains the first received magnetic field strength value from the first high frequency signal.

Step S105: The first standard magnetic field strength value is prestored in the third storage unit 201 of the computing device 20. The computing device 20 calculates a difference between the first received magnetic field strength value and the first standard magnetic field strength value. Specifically, the analysis operation module 106 controls the operation unit 204 to read the first standard magnetic field strength value and the first received magnetic field strength value, and calculate the first received magnetic field strength value and the first standard magnetic field strength value. The difference between the two. If it is judged that the difference is zero or falls within the allowable error range, the sensing sensitivity of the sensing key 300 meets the requirements, and no correction is required, and the flow ends. If the difference does not fall within the allowable range of the error, the sensor key 300 is continuously corrected, and the process proceeds to step S107.

Step S107: The signal source 10 transmits a second low frequency signal, the second low frequency signal includes a second standard magnetic field strength value; and the induction key 300 receives the second low frequency signal. Specifically, the low frequency transmission control module 102 controls the low frequency transmitting unit 13 of the signal source 10 to transmit the second low frequency signal, and the second low frequency signal includes a second standard magnetic field strength different from the first standard magnetic field strength value. The low frequency receiving unit 304 of the inductive key 300 receives the second low frequency signal and identifies the magnetic field strength value of the second low frequency signal it receives. The magnetic field strength value of the second low frequency signal received by the low frequency receiving unit 304 is a second received magnetic field strength value.

Step S109: The induction key 300 transmits a second high frequency signal to the computing device 20, the second high frequency signal including the second received magnetic field strength value; and the computing device 20 receives the second high frequency signal. Specifically, the high frequency emission control module 104 controls the high frequency transmitting unit 306 of the inductive key 300 to transmit the second high frequency signal to the computing device 20, the second high frequency signal including the second received magnetic field strength value. The transmission unit 202 of the arithmetic device 20 receives the second high frequency signal and acquires the second received magnetic field strength value from the second high frequency signal.

Step S111: The second standard magnetic field strength value is prestored in the third storage unit 201 of the computing device 20. The arithmetic device 20 calculates a difference between the second received magnetic field strength value and the second standard magnetic field strength value. Specifically, the analysis operation module 106 controls the operation unit 204 to read the second standard magnetic field strength value and the second received magnetic field strength value, and calculate the second received magnetic field strength value and the second standard magnetic field strength value. The difference between the two.

Step S113: The computing device 20 calculates the difference between the first received magnetic field strength value and the first standard magnetic field strength value and the difference between the second received magnetic field strength value and the second standard magnetic field strength value. The sensor key 300 receives the error level of the magnetic field signal and the error compensation algorithm required to eliminate the error.

Specifically, the analysis operation module 106 controls the operation unit 204 to establish a first functional relationship between the first standard magnetic field strength value and the second standard magnetic field strength value, and the first received magnetic field strength value and the second Receiving a second functional relationship between the values of the magnetic field strengths, and establishing a mapping function relationship between the first functional relationship and the second functional relationship. The mapping function relationship is the error compensation algorithm required to eliminate the error. In the present embodiment, the mapping function relationship is determined by an offset and a slope difference of the first functional relationship with respect to the second functional relationship.

Step S115: The computing device 20 continues to transmit the error compensation algorithm back to the inductive key 300, and the inductive key 300 receives and stores the error compensation algorithm. Specifically, the correction module 108 controls the transmission unit 202 to transmit and store the mapping function relationship into the first storage unit 302 of the inductive key 300.

Step S117: The signal source 10 transmits a third low frequency signal, the third low frequency signal includes a third standard magnetic field strength value; and the inductive key 300 receives the third low frequency signal. Specifically, the low frequency emission control module 102 again controls the low frequency transmitting unit 13 of the signal source 10 to emit a third low frequency signal, while the Helmholtz coil 15 connected to the low frequency transmitting unit 13 emits a magnetic field, so that the third low frequency signal includes a third transmitted magnetic field strength value, the third transmitted magnetic field strength value being a third standard magnetic field strength value. The low frequency receiving unit 304 of the inductive key 300 receives the third low frequency signal and identifies the magnetic field strength value of the third low frequency signal it receives. The magnetic field strength value of the third low frequency signal received by the low frequency receiving unit 304 is a third received magnetic field strength value.

Step S119: The sensing key 300 applies the error compensation algorithm to compensate the third received magnetic field strength value to obtain a third approximate standard magnetic field strength value; the induction key 300 continues to send the third high frequency signal to the computing device 20 The third high frequency signal includes the third approximate standard magnetic field strength value. Specifically, the processing unit 308 of the inductive key 300 recalculates the third received magnetic field strength value by applying the mapping function relationship to obtain a third approximate standard magnetic field strength value. The high frequency transmitting unit 306 transmits a third high frequency signal to the computing device 20, the third high frequency signal including the third approximate standard magnetic field strength value.

Step S121: The third standard magnetic field strength value is pre-stored in the third storage unit 201 of the computing device 20. The arithmetic device 20 calculates a difference between the third approximate magnetic field strength value and the third standard magnetic field strength value. Specifically, the analysis operation module 106 controls the operation unit 204 to read the first standard magnetic field strength value and the third approximate magnetic field strength value, and calculate the third approximate magnetic field strength value and the third standard magnetic field strength value. The difference between the two. If it is determined that the difference is zero or falls within the allowable error range, the sensing sensitivity of the inductive key 300 meets the requirements, and the current calibration process ends. If the difference does not fall within the allowable range of the error, the sensor key 300 is continuously corrected, and steps S101-S121 are performed.

The inductive key correction system and the calibration method of the present invention use the signal source 10 to sequentially transmit the second low frequency signal and simultaneously generate the magnetic field of the corresponding intensity, and the induction key 300 transmits the second received magnetic field information to the computing device 20 to meet the magnetic field strength standard. The value is compared to obtain a mapping function relationship for correction. When the signal source 10 again emits a magnetic field, the correction system allows the sensing key 300 to obtain the corrected magnetic field strength according to the mapping function relationship, thereby improving the sensing key 300 pair signal. Sensing accuracy and stability.

It can be understood that the correction system 100 can simultaneously correct a plurality of sensing keys 300 having storage and computing functions.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

S1‧‧‧Induction Key Correction System

102‧‧‧Low Frequency Launch Control Module

104‧‧‧High frequency emission control module

106‧‧‧Analytical computing module

108‧‧‧Correction module

300‧‧‧Induction key

302‧‧‧First storage unit

304‧‧‧Low frequency receiving unit

306‧‧‧High frequency launch unit

308‧‧‧Processing unit

10‧‧‧Signal source

11‧‧‧Second storage unit

13‧‧‧Low frequency launch unit

15‧‧‧ Helmholtz coil

20‧‧‧ arithmetic device

201‧‧‧ third storage unit

202‧‧‧Transport unit

204‧‧‧ arithmetic unit

no

S1‧‧‧Induction Key Correction System

102‧‧‧Low Frequency Launch Control Module

104‧‧‧High frequency emission control module

106‧‧‧Analytical computing module

108‧‧‧Correction module

Claims (10)

An inductive key correction system is applied to an inductive key, a signal source, and an arithmetic device; the inductive key includes a first storage unit, a low frequency receiving unit, a high frequency transmitting unit, and a processing unit; and the signal source includes a second storage unit And the low-frequency transmitting unit; the computing device includes a third storage unit, a transmitting unit, and an arithmetic unit, wherein the third storage unit presets a first standard magnetic field strength and a second standard magnetic field strength; the inductive key correction system includes:
a low frequency transmission control module, configured to control the low frequency transmitting unit to sequentially transmit a first low frequency signal and a second low frequency signal, wherein the first low frequency signal includes the first standard magnetic field strength value, and the second low frequency signal includes the a second standard magnetic field strength value; the first standard magnetic field strength value is different from the second standard magnetic field strength value; the sensing key sequentially receives the first low frequency signal and the second low frequency signal, and identifies and receives The magnetic field strength of the first low frequency signal is the first received magnetic field strength value, and the magnetic field strength of the received second low frequency signal is the second received magnetic field strength value;
a high frequency emission control module, configured to control the high frequency transmitting unit to sequentially transmit the first high frequency signal and the second high frequency signal, wherein the first high frequency signal and the second high frequency signal respectively comprise the first Receiving a magnetic field strength value and the second received magnetic field strength value;
An analysis operation module, configured to control the operation unit to sequentially read the first standard magnetic field strength value and the first received magnetic field strength value, and the second standard magnetic field strength value and the second received magnetic field strength value And calculating an error compensation algorithm required to compensate for an error between the received magnetic field strength value received by the low frequency receiving unit and the standard magnetic field strength value emitted by the low frequency transmitting unit; and a correction module for controlling the Transmitting unit sends the compensation algorithm to the induction key to allow the induction key to perform compensation operation on the received magnetic field strength value received by the sensing key when receiving the next low frequency signal;
The low frequency transmission control module is further configured to control the low frequency transmitting unit to continue transmitting another low frequency signal when determining that the error does not fall within a predetermined error range, to allow the inductive key correction system to The smart key is corrected until the error falls within the preset error range. The improvement of the inductive key correction system of claim 1, wherein the analysis operation module is further configured to control the low frequency transmitting unit to stop when determining that the error falls within the preset error range. Send low frequency signals. The improved key correction system of claim 1, wherein the analysis operation module is configured to determine the first standard magnetic field strength value, the first received magnetic field strength value, and the second standard magnetic field strength And a value of the second received magnetic field strength, establishing a first functional relationship between the first standard magnetic field strength value and the second standard magnetic field strength value, and establishing the first received magnetic field strength value and the first And receiving a second functional relationship between the magnetic field strength values, and establishing a mapping function relationship between the first functional relationship and the second functional relationship, the mapping function relationship being the error compensation algorithm. The improvement of the inductive key correction system of claim 3, wherein the mapping function relationship is determined by an offset and a slope difference of the first functional relationship with respect to the second functional relationship. The improved key correction system of claim 1, wherein the high frequency emission control module and the correction module are stored in the first storage unit and can be stored by the first storage A modular module that the unit executes. The improved key correction system of claim 1, wherein the low frequency emission control module is programmable in the second storage unit and executable by the second storage unit Module. The improvement of the inductive key correction system described in claim 1 is an executable module that is executed by the element. An inductive key correction method is applied to an inductive key, a signal source, and an arithmetic device; the inductive key includes a first storage unit, a low frequency receiving unit high frequency transmitting unit, and a processing unit; the signal source includes a second storage unit and a low frequency transmitting unit; the computing device includes a third storage unit, a transmitting unit, and an arithmetic unit, wherein the third storage unit presets a first standard magnetic field strength, a second standard magnetic field strength, and a third standard magnetic field strength; The key correction method includes the steps:
Controlling the low frequency transmitting unit to transmit a first low frequency signal, the first low frequency signal including the first standard magnetic field strength value; the sensing key receiving the first low frequency signal and identifying the first low frequency received The magnetic field strength of the signal is the first received magnetic field strength value;
Controlling the high frequency transmitting unit to transmit a first high frequency signal, the first high frequency signal including the first received magnetic field strength value;
Controlling the communication unit to receive the first high frequency signal;
Controlling the operation unit to read the first standard magnetic field strength value and the first received magnetic field strength value, and calculating a first difference between the first standard magnetic field strength value and the first received magnetic field strength value ;
Determining, if the first difference does not fall within a predetermined error range, controlling the low frequency transmitting unit to transmit a second low frequency signal, the second low frequency signal including the second standard magnetic field strength value; The second standard magnetic field strength value is different from the first standard magnetic field strength value; the induction key receives the second low frequency signal and identifies the received magnetic field strength of the second low frequency signal as a second received magnetic field strength value ;
Controlling the high frequency transmitting unit to transmit a second high frequency signal, the second high frequency signal including the second received magnetic field strength value;
Controlling the communication unit to receive the second high frequency signal;
Controlling, by the operation unit, the second standard magnetic field strength value and the second received magnetic field strength value, and calculating a compensation received magnetic field strength value received by the low frequency receiving unit and the low frequency transmitting unit The error compensation algorithm required for the error between the standard magnetic field strength values;
Controlling the transmission unit to send the compensation algorithm to the inductive key;
Controlling the low frequency transmitting unit to transmit a third low frequency signal, the third low frequency signal including the third standard magnetic field strength value; the sensing key receiving the third low frequency signal and identifying the received third low frequency signal The magnetic field strength is a third received magnetic field strength value;
Controlling, by the processing unit, recalculating the third received magnetic field strength value by using the mapping function relationship to obtain an approximate standard magnetic field strength value;
Controlling the high frequency transmitting unit to emit a third high frequency signal, the third high frequency signal including the scaled standard magnetic field strength value;
Controlling the operation unit to read the third standard magnetic field strength value and the approximate standard magnetic field strength value, and calculating a second difference between the third standard magnetic field strength value and the approximate standard magnetic field strength value;
Determining, if the second difference does not fall within the preset error tolerance range, continuing the correcting step until the first difference or the second difference falls within the preset error tolerance range. The improvement of the inductive key correction system according to claim 8 is characterized in that it is judged that the correction step is ended if the first difference or the second difference falls within the preset error range. The improved key correction system of claim 8 is characterized in that the analysis operation module is based on the first standard magnetic field strength value, the first received magnetic field strength value, and the second standard magnetic field strength And a value of the second received magnetic field strength, establishing a first functional relationship between the first standard magnetic field strength value and the second standard magnetic field strength value, and establishing the first received magnetic field strength value and the first And receiving a second functional relationship between the magnetic field strength values, and establishing a mapping function relationship between the first functional relationship and the second functional relationship, the mapping function relationship being the error compensation algorithm.