Method for improving card recognition stability of vehicle-mounted NFC device and control system

Abstract

This invention discloses a method for improving the stability of card recognition in vehicle-mounted NFC devices, comprising the following steps: the vehicle-mounted NFC device is periodically woken up by an external signal source when entering sleep mode; the current ambient temperature is acquired in real time, and a card recognition threshold for the vehicle-mounted NFC device is selected based on the current ambient temperature; when the vehicle-mounted NFC device is working, card recognition is performed using the aforementioned card recognition threshold; wherein, the correspondence between ambient temperature and the card recognition threshold is obtained through calibration. This invention dynamically sets the card recognition threshold based on the surrounding ambient temperature, thereby improving the stability of NFC device card recognition and avoiding problems caused by significant temperature changes. Furthermore, the wake-up cycle is dynamically modified based on the magnitude of changes in the card recognition threshold, ensuring that the NFC device can adapt to changing surrounding environments while reducing device power consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobiles, in particular to a method and control system for improving the card recognition stability of a vehicle-mounted NFC device. BACKGROUND

[0002] NFC, which stands for Near Field Communication, is a short-range high frequency wireless communication technology. Devices using NFC technology (such as mobile phones) can exchange data when they are in close proximity. This emerging technology is derived from the integration of contactless radio frequency identification (RFID) and interconnection technology. It integrates the functions of inductive card readers, inductive cards and point-to-point communication on a single chip, and uses mobile terminals to achieve mobile payment and other functions. NFC technology has the advantages of fast operation, support for black screen wake-up and high security.

[0003] NFC devices periodically emit a probe carrier wave and receive a response carrier wave, and then calculate the response carrier wave with the probe carrier wave. When the calculation result reaches the card recognition threshold, the NFC device considers that a card has entered and starts the card recognition process. However, the response carrier wave fluctuates with changes in the surrounding environment (such as temperature, NFC device location, etc.). When the surrounding environment changes greatly compared to the initial preset card recognition threshold, the read response carrier wave may not reach the card recognition threshold, resulting in a failure to recognize the card.

[0004] Chinese patent CN201510998951.7 discloses a method and system for improving the stability of NFC communication. The method includes the following steps: when the NFC device is performing NFC communication, determining whether the NFC device is in active mode; if so, obtaining the distance between the NFC device and the NFC target device; and adjusting the radio frequency field power of the NFC device according to the distance. The present application can detect the distance between the NFC device and the NFC target device by means of laser ranging, etc. When the NFC device is working in active mode, the radio frequency field power is adjusted according to the distance. It strengthens NFC communication by increasing the radio frequency strength according to the distance. When the environmental temperature changes greatly, the card recognition may still fail.

[0005] The Chinese patent CN201810292000.1 discloses a near field communication method, device and computer readable storage medium, and relates to the technical field of communication. In one aspect, the embodiment of the present application obtains basic information of a first NFC card, the first NFC card being an NFC card within a specified range from the NFC reader; thereby, according to the basic information of the first NFC card, it is judged whether the first NFC card is an NFC card for which the NFC reader performs an operation; if it is judged that the first NFC card is an NFC card for which the NFC reader performs an operation, the data of the first NFC card is obtained; and then, according to the basic information and the data, a read data operation or a write data operation is performed on the first NFC card. It can improve the stability of data communication connection and the efficiency of data transmission, and when the environmental temperature changes greatly, the situation of being unable to identify the card still occurs. SUMMARY

[0006] In the part of the summary, a series of simplified concepts are introduced, which are simplifications of the prior art in the field, which will be described in detail in the specific embodiment part. The summary part of the present application does not mean to try to limit the key features and necessary technical features of the claimed technical solution, nor does it mean to try to determine the protection scope of the claimed technical solution.

[0007] The technical problem to be solved by the present application is to provide a method for improving the card recognition stability of a vehicle-mounted NFC device, which can avoid the situation of being unable to identify the card caused by environmental changes.

[0008] And a vehicle-mounted NFC device control system which can avoid the situation of being unable to identify the card caused by environmental changes.

[0009] To solve the above technical problems, the present application provides a method for improving the card recognition stability of a vehicle-mounted NFC device, comprising the following steps:

[0010] The vehicle-mounted NFC device is periodically awakened by an external signal source when it is in a sleep state;

[0011] That is, in order to reduce the power consumption of the NFC device, the NFC device is usually in a sleep state, and the NFC device is only awakened when the card recognition threshold is dynamically set;

[0012] The current environmental temperature is obtained from the outside in real time, and the card recognition threshold of the vehicle-mounted NFC device is selected according to the current environmental temperature;

[0013] The current environmental temperature can be obtained by a separately set sensor or through a vehicle network;

[0014] When the vehicle-mounted NFC device is working, the card recognition threshold of the vehicle-mounted NFC device is used to identify the card;

[0015] The correspondence between the ambient temperature and the card recognition threshold of the vehicle-mounted NFC device is obtained through calibration.

[0016] Alternatively, the method for improving the card recognition stability of the vehicle-mounted NFC device is further improved, and the wake-up period and the card recognition threshold change rate of the vehicle-mounted NFC device are in inverse relationship.

[0017] Alternatively, the method for improving the card recognition stability of the vehicle-mounted NFC device is further improved, and the wake-up period and the card recognition threshold change rate of the vehicle-mounted NFC device are in inverse relationship.

[0018] Alternatively, the method for improving the card recognition stability of the vehicle-mounted NFC device is further improved, and the wake-up period and the card recognition threshold change rate of the vehicle-mounted NFC device are in inverse relationship.

[0019] If the newly set card recognition threshold of the vehicle-mounted NFC device changes by more than 100% compared with the last set card recognition threshold of the vehicle-mounted NFC device, the external signal source adjusts the wake-up period to 1 / 3 of the original wake-up period.

[0020] If the newly set card recognition threshold of the vehicle-mounted NFC device changes by more than 100% compared with the last set card recognition threshold of the vehicle-mounted NFC device, the external signal source adjusts the wake-up period to 1 / 3 of the original wake-up period.

[0021] If the newly set card recognition threshold of the vehicle-mounted NFC device changes by more than 80% and less than or equal to 100% compared with the last set card recognition threshold of the vehicle-mounted NFC device, the external signal source does not change the wake-up period.

[0022] If the newly set card recognition threshold of the vehicle-mounted NFC device changes by more than 60% and less than or equal to 80% compared with the last set card recognition threshold of the vehicle-mounted NFC device, the external signal source adjusts the wake-up period to 5 / 3 of the original wake-up period.

[0023] If the newly set card recognition threshold of the vehicle-mounted NFC device changes by more than 40% and less than or equal to 60% compared with the last set card recognition threshold of the vehicle-mounted NFC device, the external signal source adjusts the wake-up period to 10 / 3 of the original wake-up period.

[0024] If the newly set card recognition threshold of the vehicle-mounted NFC device changes by more than 20% and less than or equal to 40% compared with the last set card recognition threshold of the vehicle-mounted NFC device, the external signal source adjusts the wake-up period to 20 / 3 of the original wake-up period.

[0025] If the newly set card recognition threshold of the vehicle-mounted NFC device changes by more than 10% and less than or equal to 20% compared with the last set card recognition threshold of the vehicle-mounted NFC device, the external signal source adjusts the wake-up period to 10 times the original wake-up period.

[0026] To solve the above technical problems, the present application provides a vehicle-mounted NFC device control system, comprising:

[0027] MCU, which is used to set the card recognition threshold of the vehicle NFC device according to the front environment temperature;

[0028] a wake-up unit, which is connected with the interrupt pin of the MCU in the vehicle NFC device, and is used to wake up the vehicle NFC device which has been in sleep;

[0029] The correspondence between the environment temperature and the card recognition threshold of the vehicle NFC device is obtained through calibration.

[0030] Optionally, the vehicle NFC device control system is further improved, and the wake-up period of the wake-up unit and the change rate of the card recognition threshold of the vehicle NFC device are in inverse relationship.

[0031] Optionally, the vehicle NFC device control system is further improved, and when the vehicle NFC device is working, the wake-up unit stops the periodic wake-up timing.

[0032] Optionally, the vehicle NFC device control system is further improved, and the wake-up unit adjusts the wake-up period in the following way:

[0033] If the change amplitude of the newly set card recognition threshold of the vehicle NFC device to the last set card recognition threshold of the vehicle NFC device exceeds 100%, the external signal source adjusts the wake-up period to 1 / 3 of the original wake-up period.

[0034] If the change amplitude of the newly set card recognition threshold of the vehicle NFC device to the last set card recognition threshold of the vehicle NFC device exceeds 100%, the external signal source adjusts the wake-up period to 1 / 3 of the original wake-up period.

[0035] If the change amplitude of the newly set card recognition threshold of the vehicle NFC device to the last set card recognition threshold of the vehicle NFC device is greater than 80% and less than or equal to 100%, the external signal source keeps the wake-up period unchanged.

[0036] If the change amplitude of the newly set card recognition threshold of the vehicle NFC device to the last set card recognition threshold of the vehicle NFC device is greater than 60% and less than or equal to 80%, the external signal source adjusts the wake-up period to 5 / 3 of the original wake-up period.

[0037] If the change amplitude of the newly set card recognition threshold of the vehicle NFC device to the last set card recognition threshold of the vehicle NFC device exceeds 40% and is less than or equal to 60%, the external signal source adjusts the wake-up period to 10 / 3 of the original wake-up period.

[0038] If the change amplitude of the newly set card recognition threshold of the vehicle NFC device to the last set card recognition threshold of the vehicle NFC device exceeds 20% and is less than or equal to 40%, the external signal source adjusts the wake-up period to 20 / 3 of the original wake-up period.

[0039] If the re-set vehicle NFC device card recognition threshold changes more than 10% and less than or equal to 20% compared with the last set vehicle NFC device card recognition threshold, the external signal source will adjust the wake-up period to 10 times the original wake-up period.

[0040] The application selects the vehicle NFC device card recognition threshold according to the ambient temperature, which can avoid the technical problem that the NFC device cannot recognize the card due to large temperature changes.

[0041] If the surrounding environment when the user swipes the card has changed greatly compared with the surrounding environment when the initial preset card recognition threshold, the re-selected card recognition threshold can meet the demand of the response carrier read under the temperature condition after the change, thereby avoiding the situation that the card cannot be recognized.

[0042] The application dynamically sets the card recognition threshold according to the ambient temperature, thereby improving the stability of the NFC device card recognition and avoiding the problem that the card cannot be recognized due to large temperature changes. Further, the wake-up period is dynamically modified according to the change range of the card recognition threshold, which not only ensures that the NFC device can adapt to the changing surrounding environment, but also reduces the device power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0043] The drawings of the application are intended to show the general characteristics of the methods, structures and / or materials used in the specific exemplary embodiments according to the application, and to supplement the description in the specification. However, the drawings of the application are schematic drawings that are not drawn to scale, so they can not accurately reflect the precise structure or performance characteristics of any given embodiment. The drawings of the application should not be interpreted as limiting or restricting the scope of values or properties covered by the exemplary embodiments according to the application. The application is further described in detail below in conjunction with the specific embodiments and the drawings:

[0044] Figure 1 is a schematic diagram of the control system structure of the application. DETAILED DESCRIPTION

[0045] The present application is further illustrated by the following specific embodiments, and other advantages and effects of the present application can be fully understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied in different specific embodiments, and the details in the present application can be applied based on different views, and various modifications or changes can be made without departing from the general design idea of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. The following exemplary embodiments of the present application can be implemented in various forms, and should not be interpreted as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present application complete and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0046] First embodiment

[0047] The present application provides a method for improving the card recognition stability of a vehicle-mounted NFC device, comprising the following steps:

[0048] The vehicle-mounted NFC device is periodically awakened by an external signal source when it enters hibernation;

[0049] The current ambient temperature is obtained from the outside in real time, and the card recognition threshold of the vehicle-mounted NFC device is selected according to the current ambient temperature;

[0050] When the vehicle-mounted NFC device is working, the card recognition threshold of the vehicle-mounted NFC device is used for card recognition;

[0051] The corresponding relationship between the ambient temperature and the card recognition threshold of the vehicle-mounted NFC device is obtained by calibration, the wake-up period and the change rate of the card recognition threshold of the vehicle-mounted NFC device are in inverse relationship, and the periodic wake-up timing is stopped when the vehicle-mounted NFC device is working.

[0052] Second embodiment

[0053] The present application provides a method for improving the card recognition stability of a vehicle-mounted NFC device, comprising the following steps:

[0054] The vehicle-mounted NFC device is periodically awakened by an external signal source when it enters hibernation;

[0055] The current ambient temperature is obtained from the outside in real time, and the card recognition threshold of the vehicle-mounted NFC device is selected according to the current ambient temperature;

[0056] When the vehicle-mounted NFC device is working, the card recognition threshold of the vehicle-mounted NFC device is used for card recognition;

[0057] The corresponding relationship between the ambient temperature and the card recognition threshold of the vehicle-mounted NFC device is obtained by calibration, the wake-up period and the change rate of the card recognition threshold of the vehicle-mounted NFC device are in inverse relationship, and the periodic wake-up timing is stopped when the vehicle-mounted NFC device is working.

[0058] In resetting the card recognition threshold of the vehicle NFC device, the following options are provided;

[0059] If the card recognition threshold of the vehicle NFC device is reset by more than 100% of the last set card recognition threshold of the vehicle NFC device, the external signal source adjusts the wake-up period to 1 / 3 of the original wake-up period;

[0060] If the card recognition threshold of the vehicle NFC device is reset by more than 100% of the last set card recognition threshold of the vehicle NFC device, the external signal source adjusts the wake-up period to 1 / 3 of the original wake-up period;

[0061] If the card recognition threshold of the vehicle NFC device is reset by more than 80% and less than or equal to 100% of the last set card recognition threshold of the vehicle NFC device, the external signal source does not change the wake-up period;

[0062] If the card recognition threshold of the vehicle NFC device is reset by more than 60% and less than or equal to 80% of the last set card recognition threshold of the vehicle NFC device, the external signal source adjusts the wake-up period to 5 / 3 of the original wake-up period;

[0063] If the card recognition threshold of the vehicle NFC device is reset by more than 40% and less than or equal to 60% of the last set card recognition threshold of the vehicle NFC device, the external signal source adjusts the wake-up period to 10 / 3 of the original wake-up period;

[0064] If the card recognition threshold of the vehicle NFC device is reset by more than 20% and less than or equal to 40% of the last set card recognition threshold of the vehicle NFC device, the external signal source adjusts the wake-up period to 20 / 3 of the original wake-up period;

[0065] If the card recognition threshold of the vehicle NFC device is reset by more than 10% and less than or equal to 20% of the last set card recognition threshold of the vehicle NFC device, the external signal source adjusts the wake-up period to 10 times the original wake-up period.

[0066] Third embodiment;

[0067] Reference Figure 1 As shown, the present application provides a vehicle NFC device control system, comprising:

[0068] MCU, for setting the card recognition threshold of the vehicle NFC device according to the front environment temperature;

[0069] Wake-up unit RTC, which can adopt a wake-up source device, the wake-up pin of which is connected to the MCU interrupt pin in the vehicle NFC device, for waking up the vehicle NFC device which has been in sleep;

[0070] NFC card reader, emitting a probe carrier and receiving a response carrier, starting a card reading process, reading NFC card data;

[0071] NFC card, storing NFC key data;

[0072] Vehicle actuator, receiving NFC device data, performing vehicle operations, such as unlocking the vehicle door;

[0073] Wherein, the corresponding relationship between the ambient temperature and the card recognition threshold of the vehicle NFC device is obtained by calibration.

[0074] Fourth embodiment;

[0075] With reference to Figure 1 As shown, the present application provides a vehicle NFC device control system, comprising:

[0076] MCU, for setting the card recognition threshold of the vehicle NFC device according to the previous ambient temperature;

[0077] Wake-up unit RTC, which can adopt a wake-up source device, the wake-up pin of which is connected to the MCU interrupt pin in the vehicle NFC device, for waking up the vehicle NFC device that has been in sleep;

[0078] NFC card reader, emitting a probe carrier and receiving a response carrier, starting a card reading process, reading NFC card data;

[0079] NFC card, storing NFC key data;

[0080] Vehicle actuator, receiving NFC device data, performing vehicle operations, such as unlocking the vehicle door;

[0081] Wherein, the corresponding relationship between the ambient temperature and the card recognition threshold of the vehicle NFC device is obtained by calibration, and the wake-up unit stops the periodic wake-up timing when the vehicle NFC device is working;

[0082] When resetting the card recognition threshold of the vehicle NFC device, the following options are exemplarily provided;

[0083] If the reset card recognition threshold of the vehicle NFC device changes by more than 100% compared with the last set card recognition threshold of the vehicle NFC device, the external signal source will adjust the wake-up period to 1 / 3 of the original wake-up period;

[0084] If the reset card recognition threshold of the vehicle NFC device changes by more than 100% compared with the last set card recognition threshold of the vehicle NFC device, the external signal source will adjust the wake-up period to 1 / 3 of the original wake-up period;

[0085] If the newly set vehicle NFC device card recognition threshold value changes more than 80% and less than or equal to 100% than the last set vehicle NFC device card recognition threshold value, the external signal source wakeup period is unchanged;

[0086] If the newly set vehicle NFC device card recognition threshold value changes more than 60% and less than or equal to 80% than the last set vehicle NFC device card recognition threshold value, the external signal source will adjust the wakeup period to 5 / 3 of the original wakeup period;

[0087] If the newly set vehicle NFC device card recognition threshold value changes more than 40% and less than or equal to 60% than the last set vehicle NFC device card recognition threshold value, the external signal source will adjust the wakeup period to 10 / 3 of the original wakeup period;

[0088] If the newly set vehicle NFC device card recognition threshold value changes more than 20% and less than or equal to 40% than the last set vehicle NFC device card recognition threshold value, the external signal source will adjust the wakeup period to 20 / 3 of the original wakeup period;

[0089] If the newly set vehicle NFC device card recognition threshold value changes more than 10% and less than or equal to 20% than the last set vehicle NFC device card recognition threshold value, the external signal source will adjust the wakeup period to 10 times of the original wakeup period.

[0090] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0091] The application has been described in detail by specific implementation and examples, but these do not constitute a limitation on the application. Those skilled in the art can also make many modifications and improvements without departing from the principles of the application, and these should also be considered as within the scope of protection of the application.

Claims

1. A method for improving the stability of card recognition in vehicle-mounted NFC devices, characterized in that, Includes the following steps: When the in-vehicle NFC device enters sleep mode, it is periodically woken up by an external signal source. The system obtains the current ambient temperature from the outside in real time and selects the card recognition threshold for the in-vehicle NFC device based on the current ambient temperature. When the vehicle-mounted NFC device is working, it uses the vehicle-mounted NFC device card recognition threshold to recognize the card; The relationship between ambient temperature and the card recognition threshold of the vehicle NFC device is obtained through calibration.

2. The method for improving the stability of card recognition in vehicle-mounted NFC devices as described in claim 1, characterized in that: The wake-up cycle and the rate of change of the card recognition threshold of the vehicle NFC device are inversely related.

3. The method for improving the stability of card recognition in vehicle-mounted NFC devices as described in claim 1, characterized in that: When the in-vehicle NFC device is working, the stop cycle wake-up timer is activated.

4. The method for improving the stability of card recognition in vehicle-mounted NFC devices as described in claim 1, characterized in that, Also includes: If the reset threshold for card recognition of the vehicle NFC device changes by more than 100% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 1 / 3 of the original wake-up cycle. If the reset threshold for vehicle NFC device card recognition changes by more than 80% but less than or equal to 100% compared to the previously set threshold, the external signal source wake-up cycle remains unchanged. If the reset threshold for card recognition of the vehicle NFC device changes by more than 60% but less than or equal to 80% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 5 / 3 of the original wake-up cycle. If the reset threshold for card recognition of the vehicle NFC device changes by more than 40% but less than or equal to 60% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 10 / 3 of the original wake-up cycle. If the reset threshold for card recognition of the vehicle NFC device changes by more than 20% but less than or equal to 40% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 20 / 3 of the original wake-up cycle. If the reset threshold for card recognition of the vehicle NFC device changes by more than 10% but less than or equal to 20% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 10 times the original wake-up cycle.

5. A vehicle-mounted NFC device control system, characterized in that, include: MCU, which is used to set the card recognition threshold of the vehicle NFC device according to the current ambient temperature; The wake-up unit has a wake-up pin connected to the MCU interrupt pin in the vehicle NFC device, which is used to periodically wake up the vehicle NFC device that has been in a dormant state. The relationship between ambient temperature and the card recognition threshold of the vehicle NFC device is obtained through calibration.

6. The vehicle-mounted NFC device control system as described in claim 5, characterized in that: The wake-up cycle of the wake-up unit is inversely related to the rate of change of the card recognition threshold of the vehicle NFC device.

7. The vehicle-mounted NFC device control system as described in claim 5, characterized in that: When the in-vehicle NFC device is working, the wake-up unit stops the periodic wake-up timer.

8. The vehicle-mounted NFC device control system as described in claim 5, characterized in that: The wake-up unit adjusts the wake-up cycle in the following ways; If the reset threshold for card recognition of the vehicle NFC device changes by more than 100% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 1 / 3 of the original wake-up cycle. If the reset threshold for vehicle NFC device card recognition changes by more than 80% but less than or equal to 100% compared to the previously set threshold, the external signal source wake-up cycle remains unchanged. If the reset threshold for card recognition of the vehicle NFC device changes by more than 60% but less than or equal to 80% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 5 / 3 of the original wake-up cycle. If the reset threshold for card recognition of the vehicle NFC device changes by more than 40% but less than or equal to 60% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 10 / 3 of the original wake-up cycle. If the reset threshold for card recognition of the vehicle NFC device changes by more than 20% but less than or equal to 40% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 20 / 3 of the original wake-up cycle. If the reset threshold for card recognition of the vehicle NFC device changes by more than 10% but less than or equal to 20% compared to the previously set threshold, the external signal source will adjust the wake-up cycle to 10 times the original wake-up cycle.

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