Method and device for safe operation of a car-grade cellular communication module and storage medium

Abstract

The embodiment of the application provides a kind of vehicle regulation level cellular communication module's safe operation method, device and storage medium, the method comprises: collecting the power supply voltage when communication module is powered on during vehicle driving;According to the power supply voltage and the preset lower limit of power supply voltage, obtain the first voltage drop value;The current working frequency band of communication module is obtained, and the first preset corresponding relationship between the transmit power corresponding to the current working frequency band and the voltage drop value;According to the first preset corresponding relationship, the transmit power corresponding to the first voltage drop value is obtained, to obtain the first safe transmit power;Control communication module according to the first safe transmit power carries out limited power operation.According to the technical scheme of the embodiment of the application, vehicle regulation level cellular communication module can be controlled to carry out limited power operation according to the safe transmit power matched with current power supply environment, to ensure that communication module works within safe voltage range.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of Internet of Things communication, and particularly relates to a safe operation method and device of a vehicle-grade cellular communication module and a storage medium. BACKGROUND

[0002] With the development of the Internet of Vehicles, a cellular communication module is usually assembled in a vehicle system for public network communication to realize functions such as vehicle data uploading and analysis, audio and video entertainment, navigation, and auxiliary driving. Compared with a consumer-grade or industrial-grade communication module, the cellular communication module assembled in a vehicle has higher requirements for reliability.

[0003] For the cellular communication module, when a radio frequency signal is transmitted through an antenna, the working current of the module instantaneously increases, resulting in voltage drop of the power supply. If the voltage drop is below the minimum working voltage of the module, unpredictable damage to the module will occur. Therefore, when designing a circuit board, the user needs to perform special power supply design on the cellular communication module to ensure that the voltage drop is within a safe range.

[0004] However, in actual application environments, changes in the power supply environment or the network environment will cause uncontrollable voltage drop, affecting the safe operation of the module. SUMMARY

[0005] The embodiments of the application provide a safe operation method and device of a vehicle-grade cellular communication module and a storage medium, which can control the vehicle-grade cellular communication module to perform limited power operation according to a safe transmission power matched with a current power supply environment, and ensure that the communication module operates within a safe voltage range.

[0006] In a first aspect, the embodiments of the application provide a safe operation method of a vehicle-grade cellular communication module, which comprises the following steps.

[0007] Collecting a power supply voltage when the communication module is powered on and operated during vehicle driving;

[0008] Obtaining a first voltage drop value according to the power supply voltage and a preset lower limit of the power supply voltage;

[0009] Obtaining a current working frequency band of the communication module, and a first preset correspondence relationship between a transmission power corresponding to the current working frequency band and a voltage drop value;

[0010] Obtaining a transmission power corresponding to the first voltage drop value according to the first preset correspondence relationship, to obtain a first safe transmission power;

[0011] Controlling the communication module to perform limited power operation according to the first safe transmission power;

[0012] The first preset correspondence relation corresponding to the current working frequency band is determined by the communication module in the vehicle debugging process under the maximum safe transmission power of the current working frequency band and a plurality of sets of transmission power and corresponding voltage drop values.

[0013] In an implementable embodiment, the communication module is integrated with a storage chip and a radio frequency power amplification chip, and the method further comprises: obtaining the minimum supply voltage of the communication module, the minimum working voltage of the storage chip and the current transmission power of the radio frequency power amplification chip in the process of data transmission of the communication module; determining whether the minimum working voltage of the storage chip and the minimum supply voltage of the communication module both meet the corresponding safety requirements; in the case that the minimum supply voltage of the communication module and the minimum working voltage of the storage chip both meet the corresponding safety requirements, controlling the communication module to operate at the first safe transmission power; wherein the safety requirement corresponding to the minimum supply voltage of the communication module is used to indicate that the minimum supply voltage of the communication module is greater than or equal to the preset lower limit of the supply voltage; the safety requirement corresponding to the minimum working voltage of the storage chip is used to indicate that the absolute value of the difference between the minimum working voltage of the storage chip and the initial working voltage is less than or equal to the preset voltage fluctuation threshold, and the initial working voltage is used to indicate the working voltage of the storage chip when the communication module is powered on and operated in the vehicle debugging process.

[0014] In an implementable embodiment, the method further comprises: in the case that the minimum working voltage of the storage chip or the minimum supply voltage of the communication module does not meet the corresponding safety requirement, reducing the transmission power of the radio frequency power amplification chip; controlling the communication module to transmit data according to the reduced transmission power until the minimum supply voltage of the communication module and the minimum working voltage of the storage chip both meet the corresponding safety requirements, obtaining the current transmission power of the radio frequency power amplification chip to obtain the second safe transmission power; controlling the communication module to operate at the second safe transmission power.

[0015] In an implementable embodiment, the method further comprises: in the case that the minimum working voltage of the storage chip does not meet the corresponding safety requirement, prohibiting the communication module from performing write operation on the storage chip.

[0016] In an implementable embodiment, the radio frequency power amplification chip and the storage chip are integrated in the communication module, and before the current working frequency band of the communication module and the first preset correspondence between the corresponding transmission power and voltage drop value of the current working frequency band are acquired, the method further comprises: collecting an initial power supply voltage of the communication module and an initial working voltage of the storage chip during power-on operation of the communication module in the vehicle debugging process; controlling the radio frequency power amplification chip to transmit according to the maximum set power of each frequency band to obtain the minimum power supply voltage of the communication module and the minimum working voltage of the storage chip under each frequency band; determining the maximum safe transmission power of the communication module in each frequency band according to the minimum power supply voltage of the communication module, the minimum working voltage of the storage chip, the initial working voltage of the storage chip, and the preset lower limit of the power supply voltage; controlling the radio frequency power amplification chip to transmit according to the power gradient within the maximum safe transmission power of each frequency band to obtain the preset correspondence between the corresponding transmission power and voltage drop value of each frequency band, wherein the voltage drop value corresponding to the first transmission power of the first frequency band is equal to the difference between the initial power supply voltage of the communication module and the minimum power supply voltage of the communication module under the first frequency band based on the first transmission power.

[0017] In an implementable embodiment, the maximum safe transmission power of the communication module in each frequency band is determined according to the minimum power supply voltage of the communication module, the minimum working voltage of the storage chip, the initial working voltage of the storage chip, and the preset lower limit of the power supply voltage, comprising: respectively determining whether the minimum power supply voltage of the communication module and the minimum working voltage of the storage chip under each frequency band meet the corresponding safety requirements; for any frequency band, in the case that the minimum power supply voltage of the communication module and the minimum working voltage of the storage chip under the frequency band both meet the corresponding safety requirements, the maximum set transmission power of the frequency band is determined as the maximum safe transmission power thereof; wherein the safety requirement corresponding to the minimum power supply voltage of the communication module is used to indicate that the minimum power supply voltage of the communication module is greater than or equal to the preset lower limit of the power supply voltage; the safety requirement corresponding to the minimum working voltage of the storage chip is used to indicate that the absolute value of the difference between the minimum working voltage and the initial working voltage of the storage chip is less than or equal to the preset voltage fluctuation threshold.

[0018] In an implementable embodiment, the method further comprises: for any frequency band, in the case that the minimum power supply voltage of the communication module or the minimum working voltage of the storage chip under the frequency band does not meet the corresponding safety requirement, reducing the transmission power of the radio frequency power amplification chip; controlling the communication module to transmit according to the reduced transmission power until the minimum power supply voltage of the communication module and the minimum working voltage of the storage chip both meet the preset safety requirement, acquiring the current transmission power of the radio frequency power amplification chip to obtain the maximum safe transmission power of the frequency band.

[0019] In an implementable embodiment, the method further comprises: in response to a change in the operating frequency band of the communication module, obtaining a new current operating frequency band, and a second preset correspondence between the new current operating frequency band and a corresponding transmit power and voltage drop value; obtaining the transmit power corresponding to the first voltage drop value according to the second preset correspondence to obtain a third safe transmit power; and controlling the communication module to operate at a limited power according to the third safe transmit power.

[0020] In an implementable embodiment, the method further comprises: in a case where the first voltage drop value is less than a preset voltage drop threshold, outputting prompt information indicating that the supply voltage of the communication module is at risk.

[0021] In a second aspect, an embodiment of the present application provides a safe operation device of a vehicle-grade cellular communication module, which comprises:

[0022] a collection module configured to collect a supply voltage of the communication module during powered operation of the communication module during vehicle driving;

[0023] a calculation module configured to obtain a first voltage drop value according to the supply voltage and a preset lower limit of the supply voltage;

[0024] a first obtaining module configured to obtain a current operating frequency band of the communication module, and a first preset correspondence between the current operating frequency band and a corresponding transmit power and voltage drop value;

[0025] a second obtaining module configured to obtain the transmit power corresponding to the first voltage drop value according to the first preset correspondence to obtain a first safe transmit power;

[0026] a running control module configured to control the communication module to operate at a limited power according to the first safe transmit power;

[0027] The first preset correspondence corresponding to the current operating frequency band is determined by the communication module in a vehicle debugging process at a maximum safe transmit power of the current operating frequency band.

[0028] In a third aspect, an embodiment of the present application provides a controller, which comprises: at least one processor; and a storage chip in communication connection with the at least one processor; wherein the storage chip stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the safe operation method of the vehicle-grade cellular communication module of any one of the above embodiments.

[0029] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium storing computer instructions for causing a computer to execute the method for safe operation of a vehicle-grade cellular communication module according to any of the above.

[0030] In a fifth aspect, an embodiment of the present application provides a vehicle-grade cellular communication module, which is integrated with a baseband chip, a radio frequency power amplification chip and a controller as above. The baseband chip is integrated with a storage chip, a radio frequency transceiver chip and a power management chip. A VBAT pin of the communication module is connected to a VCC pin of the baseband chip. A first ADC pin of the baseband chip is connected to a line between the VBAT pin of the communication module and the VCC pin of the baseband chip, for collecting a supply voltage of the communication module. A second ADC pin of the baseband chip is connected to a first VDD pin of the baseband chip, for collecting a working voltage of the storage chip. A second VDD pin of the baseband chip is connected to a VCC pin of the radio frequency power amplification chip, for supplying power to the radio frequency power amplification chip. A MIPI interface of the baseband chip is electrically connected to the radio frequency power amplification chip, for controlling a transmission power of the radio frequency power amplification chip.

[0031] In an implementable embodiment of the fifth aspect, the communication module is further integrated with a protection circuit, which is arranged on the line between the VBAT pin of the communication module and the VCC pin of the baseband chip. The protection circuit is composed of one or more of the following devices in series: a Zener diode, a bidirectional TVS tube and a current-limiting mos tube.

[0032] In a sixth aspect, an embodiment of the present application provides a vehicle-grade cellular communication module, which is integrated with a baseband chip, a power management chip, a storage chip, a radio frequency transceiver chip, a radio frequency power amplification chip and a controller as above. A VBAT pin of the communication module is connected to a VCC pin of the power management chip. A first VDD pin of the power management chip is connected to a VCC pin of the baseband chip. A second VDD pin of the power management chip is connected to a VCC pin of the storage chip. A third VDD pin of the power management chip is connected to a VCC pin of the radio frequency transceiver chip. A fourth VDD pin of the power management chip is connected to a VCC pin of the radio frequency power amplification chip. A first ADC pin of the baseband chip is connected to a line between the VBAT pin of the communication module and the VCC pin of the power management chip, for collecting a supply voltage of the communication module. A second ADC pin of the baseband chip is connected to a line between the second VDD pin of the power management chip and the VCC pin of the storage chip, for collecting a working voltage of the storage chip. A first MIPI interface of the baseband chip is electrically connected to the radio frequency transceiver chip, and a second MIPI interface of the baseband chip is electrically connected to the radio frequency power amplification chip, for controlling a transmission power of the radio frequency power amplification chip.

[0033] In an implementable embodiment of the sixth aspect, the communication module further integrates a protection circuit, which is arranged on a line between a VBAT pin of the communication module and a VCC pin of the power management chip; the protection circuit is composed of one or more of the following devices in series: a Zener diode, a bidirectional TVS tube and a current-limiting mos tube.

[0034] The method, device, equipment and computer storage medium for safe operation of the vehicle-grade cellular communication module provided by the embodiments of the present application first collect the power supply voltage when the communication module is powered on during vehicle driving; then obtain a first voltage drop value according to the power supply voltage and a preset lower limit of the power supply voltage; then acquire the current working frequency band of the communication module, and a first preset correspondence relationship between the current working frequency band and the transmission power corresponding to the voltage drop value; and then obtain the transmission power corresponding to the first voltage drop value according to the first preset correspondence relationship, to obtain a first safe transmission power.

[0035] Since the first preset correspondence relationship corresponding to the current working frequency band is determined according to a plurality of sets of transmission power and corresponding voltage drop values under the maximum safe transmission power of the current working frequency band of the communication module during vehicle debugging, and the first voltage drop value is obtained according to the power supply voltage when the communication module is powered on during vehicle driving and the preset lower limit of the power supply voltage, the first safe transmission power obtained based on the first preset correspondence relationship and the first voltage drop value can be determined to be safe and adaptive to the current power supply environment, so that the communication module is controlled to perform power-limited operation according to the first safe transmission power, thereby solving the voltage drop problem in the vehicle-mounted environment in a targeted manner, enabling the communication module to work in a safe voltage range, and ensuring that the communication module can operate safely. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0037] Figure 1 is a structural schematic diagram of a vehicle-grade cellular communication module provided by an embodiment of the present application;

[0038] Figure 2 is a structural schematic diagram of a vehicle-grade cellular communication module provided by another embodiment of the present application;

[0039] Figure 3 is a flowchart of a safe operation method of a vehicle-grade cellular communication module provided by an embodiment of the present application;

[0040] Figure 4is a flowchart of a method for safe operation of a vehicle-grade cellular communication module according to another embodiment of the present application;

[0041] Figure 5 is a flowchart of a method for safe operation of a vehicle-grade cellular communication module according to another embodiment of the present application;

[0042] Figure 6 is a flowchart of a method for safe operation of a vehicle-grade cellular communication module according to another embodiment of the present application;

[0043] Figure 7 is a flowchart of a method for safe operation of a vehicle-grade cellular communication module according to another embodiment of the present application;

[0044] Figure 8 is a structural diagram of a device for safe operation of a vehicle-grade cellular communication module according to an embodiment of the present application;

[0045] Figure 9 is a structural diagram of a controller according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to explain the principles of the present application and are not intended to limit the present application. The present application can be implemented without some of the specific details, which are well known to those skilled in the art. The following description of the embodiments is merely provided to give a better understanding of the present application by showing examples of the present application.

[0047] It should be noted that, in this document, relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0048] To solve the existing problems, an embodiment of the present application provides a vehicle-grade cellular communication module, Figure 1 and Figure 2Two hardware configurations of the vehicle-grade cellular communication module are respectively shown, and compared with Figure 1 Figure 2 The functional chips integrated in the communication module are more discrete.

[0049] In the example of Figure 1 The vehicle-grade cellular communication module integrates a baseband chip, a radio frequency power amplification chip and a controller (not shown in the figure), the baseband chip integrates a storage chip (denoted by FLASH), a radio frequency transceiver chip (denoted by TRSANCEIVER) and a power management chip (denoted by PMU), and the baseband chip function is denoted by BB.

[0050] The VBAT pin of the communication module is connected to the VCC pin of the baseband chip; the first ADC pin (ADC0) of the baseband chip is connected to a line between the VBAT pin of the communication module and the VCC pin of the baseband chip, for collecting the power supply voltage (the VBAT voltage value) of the communication module; the second ADC pin (ADC1) of the baseband chip is connected to the first VDD pin (VDD_FLASH) of the baseband chip, for collecting the working voltage (the VDD_FLASH voltage value) of the storage chip; the second VDD pin (VDD_PA) of the baseband chip is connected to the VCC pin of the radio frequency power amplification chip, for supplying power to the radio frequency power amplification chip; the MIPI interface of the baseband chip is electrically connected to the radio frequency power amplification chip, and the baseband chip controls the radio frequency power amplification chip through the MIPI interface, for controlling the transmission power of each frequency band, and other circuits inside the module are designed according to the vehicle-grade module requirements.

[0051] In the example of Figure 2 The vehicle-grade cellular communication module integrates a baseband chip, a power management chip, a storage chip, a radio frequency transceiver chip, a radio frequency power amplification chip and a controller as above (not shown in the figure).

[0052] ​The VBAT pin of the communication module is connected to the VCC pin of the power management chip; the first VDD pin (VDD_BB) of the power management chip is connected to the VCC pin of the baseband chip; the second VDD pin (VDD_FLASH) of the power management chip is connected to the VCC pin of the storage chip; the third VDD pin (VDD_RF) of the power management chip is connected to the VCC pin of the radio frequency transceiver chip; the fourth VDD pin (VDD_PA) of the power management chip is connected to the VCC pin of the radio frequency power amplifier chip; the first ADC pin (ADC0) of the baseband chip is connected to a line between the VBAT pin of the communication module and the VCC pin of the power management chip, and is used to collect the power supply voltage (the VBAT voltage value) of the communication module; the second ADC pin (ADC1) of the baseband chip is connected to a line between the second VDD pin (VDD_FLASH) of the power management chip and the VCC pin of the storage chip, and is used to collect the working voltage (the VDD_FLASH voltage value) of the storage chip; the first MIPI interface (MIPI0) of the baseband chip is electrically connected to the radio frequency transceiver chip, and the second MIPI interface (MIPI1) of the baseband chip is electrically connected to the radio frequency power amplifier chip; the baseband chip controls the radio frequency power amplifier chip and the radio frequency transceiver chip through the MIPI interface, and is used to control the transmission power of each frequency band; other circuits inside the module are designed according to the requirements of the vehicle scale group.

[0053] In some embodiments, to cope with the power impact generated by the actual vehicle-mounted environment, referring to Figure 1 and Figure 2 , the vehicle-grade cellular communication module can also be integrated with a protection circuit.

[0054] Figure 1 The protection circuit in the above formula 1 is arranged on a line between the VBAT pin of the communication module and the VCC pin of the baseband chip. Figure 2 The protection circuit in the above formula 1 is arranged on a line between the VBAT pin of the communication module and the VCC pin of the power management chip. The protection circuit can be composed of one or more of the following devices in series: a Zener diode, a bidirectional TVS tube and a current-limiting mos tube.

[0055] Exemplarily, a three-stage protection circuit can be composed of a Zener diode, a bidirectional TVS tube and a current-limiting mos tube in series to protect the input power of the module; wherein the first-stage Zener diode is used to prevent surge impact, the second-stage bidirectional TVS tube is used to prevent instantaneous pulse impact, and the third-stage high-power MOS tube is used to limit current to resist the failure risk brought by the power impact and improve the reliability of the vehicle-grade communication module. Those skilled in the art can select the protection level and device composition of the protection circuit according to the actual situation, which is not limited here.

[0056] The application also provides a safe operation method of the vehicle regulation level cellular communication module, which is used for the controller in the vehicle regulation level cellular communication module to control the vehicle regulation level cellular communication module to operate in the limited power mode according to the safe transmission power matched with the current environment, so as to ensure that the communication module operates in the safe voltage range.

[0057] As shown in Figure 3 , the safe operation method of the vehicle regulation level cellular communication module provided by the application includes steps S301 to S305.

[0058] Step S301, collecting the power supply voltage when the communication module operates in the power-on mode during the vehicle driving process;

[0059] Step S302, obtaining a first voltage drop value according to the power supply voltage and a preset lower limit of the power supply voltage;

[0060] The first voltage drop value is equal to the difference between the power supply voltage and the preset lower limit of the power supply voltage.

[0061] Exemplarily, a voltage drop threshold value can be set, which can be a small value, for example, 0.2V. In the case that the first voltage drop value is less than the preset voltage drop threshold value, it indicates that the margin of the power supply voltage drop is small, which is easy to exceed the preset lower limit of the power supply voltage. In this case, the prompt information for indicating that the power supply voltage of the communication module has a safety risk can be output.

[0062] Step S303, obtaining the current working frequency band of the communication module, and a first preset correspondence relationship between the transmission power corresponding to the current working frequency band and the voltage drop value;

[0063] The first preset correspondence relationship corresponding to the current working frequency band is determined by a plurality of sets of transmission power and corresponding voltage drop values of the communication module at the maximum safe transmission power of the current working frequency band in the vehicle debugging process.

[0064] Step S304, obtaining the transmission power corresponding to the first voltage drop value according to the first preset correspondence relationship, to obtain a first safe transmission power;

[0065] Step S305, controlling the communication module to operate in the limited power mode according to the first safe transmission power.

[0066] The following will be illustrated by combining the hardware configuration of the vehicle regulation level cellular communication module in Figure 1 and Figure 2 , and the safe operation method in Figure 4 through steps a1-a4. Figure 3

[0067] ​Step a1, when the vehicle is running, the vehicle circuit board supplies power to the module VABT pin to start running;

[0068] Step a2, the module ADC0 interface detects and records the VBAT normal working voltage Vbat work, calculates the voltage drop value AV work = Vbat work-VBAT min, and VBAT min is the minimum value of the module voltage (i.e. the lower limit of the preset power supply voltage).

[0069] Step a3, if AV work <0.2V, the service provider is prompted by the vehicle platform that there is a voltage risk.

[0070] Step a4, according to the first preset corresponding relationship between the voltage drop value and the corresponding transmission power of the current working frequency band, the safe transmission power is calculated, which is set as the maximum transmission power P_BX_safe of the working frequency band; the module is controlled to run at the limited power according to P_BX_safe, so that the transmission power does not exceed P_BX_safe when the module runs at the current working frequency band.

[0071] In a specific implementation, the detection values are substituted into the above steps a1-a4, and the following results can be obtained:

[0072] Step a1, when the vehicle is running, the vehicle circuit board supplies power to the module VABT pin to start running;

[0073] Step a2, in the standby state, the VBAT voltage value Vbat work = 3.65V is detected, AV work = Vbat work-VBAT min = 3.65-3.4 = 0.25V is calculated.

[0074] Step a3, AV work >0.2V, no risk prompt.

[0075] Step a4, the network frequency band B39 is detected, P_B39_safe = 23dBm is initialized, the corresponding AVbat_B39 = 0.2V, which meets the working condition, and the module is controlled to run at the limited power according to 23dBm.

[0076] As described above, the safe running method of the vehicle-grade cellular communication module in the embodiment of the application first collects the power supply voltage when the communication module is powered on during the running of the vehicle; then obtains the first voltage drop value according to the power supply voltage and the preset lower limit of the power supply voltage; then obtains the current working frequency band of the communication module, and the first preset corresponding relationship between the corresponding transmission power and the voltage drop value of the current working frequency band; and then obtains the transmission power corresponding to the first voltage drop value according to the first preset corresponding relationship, to obtain the first safe transmission power.

[0077] Since the first preset correspondence relation corresponding to the current working frequency band is determined according to the multiple sets of transmission power and corresponding voltage drop values of the communication module under the maximum safe transmission power of the current working frequency band in the vehicle debugging process, and the first voltage drop value is obtained according to the supply voltage and the preset lower limit of the supply voltage when the communication module is powered on during the vehicle driving process, the first safe transmission power obtained based on the first preset correspondence relation and the first voltage drop value can be determined to be safe and adaptive to the current power supply environment, so that the control of the communication module to operate at the first safe transmission power can solve the voltage drop problem in the vehicle environment and enable the communication module to operate in a safe voltage range.

[0078] In some embodiments, in response to a change in the working frequency band of the communication module, a new current working frequency band can be obtained, as well as a second preset correspondence relation between the transmission power and the voltage drop value corresponding to the new current working frequency band; a transmission power corresponding to the first voltage drop value is obtained according to the second preset correspondence relation, to obtain a third safe transmission power; and the communication module is controlled to operate at the third safe transmission power.

[0079] For example, if the radio frequency working frequency band of the module is switched during the vehicle driving process, step a4 is returned to, the safe transmission power is calculated according to the current network camping frequency band, the second preset correspondence relation between the transmission power and the voltage drop value corresponding to the current network camping frequency band, and is set as the maximum transmission power of the current network camping frequency band; and the module is controlled to operate at the maximum transmission power of the current network camping frequency band, to ensure that the communication module operates in a safe voltage range.

[0080] In actual operation, the vehicle-mounted cellular communication module integrates a storage chip and a radio frequency power amplifier chip. For the vehicle-mounted cellular communication module, the module failure caused by memory loss is the most serious problem, and the cost of replacing the module is extremely high. The main reason for memory loss is unstable power supply of the storage chip.

[0081] Based on this, referring to Figure 5 , the embodiment of the application also provides a safe operation method of a vehicle-grade cellular communication module, Figure 5 and Figure 3 The difference lies in that, after step S305 in Figure 3 , steps S306 to S311 in Figure 5 are further included, which are used for corresponding risk protection of the more serious memory loss problem of the communication module.

[0082] Step S306, during the data transmission of the communication module, the lowest supply voltage of the communication module, the lowest working voltage of the storage chip, and the current transmission power of the radio frequency power amplifier chip are obtained.

[0083] Step S307, determine whether the minimum operating voltage of the storage chip and the minimum supply voltage of the communication module both meet the corresponding safety requirements.

[0084] The minimum operating voltage of the storage chip meeting the corresponding safety requirement means that the absolute value of the difference between the minimum operating voltage of the storage chip and the initial operating voltage is less than or equal to the preset voltage fluctuation threshold, where the initial operating voltage means the operating voltage of the storage chip when the communication module is powered on during the vehicle debugging process.

[0085] The minimum supply voltage of the communication module meeting the corresponding safety requirement means that the minimum supply voltage of the communication module is greater than or equal to the preset lower limit of the supply voltage.

[0086] Step S308, in the case that the minimum supply voltage of the communication module and the minimum operating voltage of the storage chip both meet the corresponding safety requirements, control the communication module to perform power-limited operation according to the first safety transmission power.

[0087] Here, the minimum supply voltage of the communication module and the minimum operating voltage of the storage chip both meet the corresponding safety requirements, which means that the communication module supply is normal and the storage chip operating voltage fluctuates within a safe range. At this time, when the storage chip is written, memory loss will not occur, so the maximum safety transmission power limit of the working frequency band can be maintained (see step S304), and the communication module is controlled to perform power-limited operation according to the first safety transmission power.

[0088] Step S309, in the case that the minimum operating voltage of the storage chip or the minimum supply voltage of the communication module does not meet the corresponding safety requirements, reduce the transmission power of the radio frequency power amplification chip.

[0089] Here, the minimum operating voltage of the storage chip or the minimum supply voltage of the communication module does not meet the corresponding safety requirements, which means that the communication module supply is low or the fluctuation amplitude of the storage chip operating voltage exceeds the safe range. At this time, writing to the storage chip is likely to cause memory loss, so as to avoid memory loss, the communication module can be prohibited from writing to the storage chip.

[0090] Further, the fluctuation amplitude of the storage chip operating voltage can be reduced by reducing the transmission power of the radio frequency power amplification chip and reducing the drop amplitude of the module supply voltage.

[0091] Step S310, control the communication module to perform data transmission according to the reduced transmission power until the minimum supply voltage of the communication module and the minimum operating voltage of the storage chip both meet the corresponding safety requirements, obtain the current transmission power of the radio frequency power amplification chip, and obtain the second safety transmission power.

[0092] Step S311, the control communication module according to the second safety transmission power for power limiting operation.

[0093] Next, the above example, the following hardware configuration of the vehicle-grade cellular communication module in Figure 1 and Figure 2 is illustrated by steps a5-a9 in Figure 4 safety operation method in Figure 5 .

[0094] Step a5, when the module transmits data, the module ADC0 interface detects and records the minimum VBAT voltage Vbat_tx (i.e. the minimum power supply voltage of the communication module), the module ADC1 interface detects and records the minimum voltage value Vmem_tx of each frequency band (i.e. the minimum operating voltage of the storage chip), and the radio frequency transmission power P_tx (i.e. the current transmission power of the radio frequency power amplifier chip) is recorded synchronously;

[0095] Step a6, if |Vmem_tx-Vmem_s|>Vmem_s×5%, it means that the voltage fluctuation is large at this time, then the FLASH write operation of the module is prohibited during data transmission, Vmem_s is the operating voltage of the storage chip during the power-on operation of the communication module during vehicle debugging;

[0096] Step a7, if Vbat_tx<VBAT_min, record the frequency band information, reduce the current transmission power P2 of the frequency band, update the maximum transmission power P_BX_safe=P_tx-P2 of the frequency band, and continue step a5;

[0097] Step a8, if Vbat_tx≥VBAT_min, the maximum transmission power P_BX_safe limit of the frequency band is maintained, and the module is controlled to operate according to P_BX_safe, so that the transmission power under the current operating frequency band during the operation of the module does not exceed P_BX_safe;

[0098] Step a9, during vehicle travel, if the radio frequency operating frequency band of the module is switched, return to step a4 and re-perform.

[0099] In a specific implementation, by substituting the detected values into the above steps a5-a9, we can get:

[0100] Step a5, due to changes in the external power supply environment, when transmitting data, it is detected that:

[0101] Vbat_tx=3.35V, Vmem_tx=1.7V, P_tx=23dBm,

[0102] Step a6, |Vmem_tx-Vmem_s|=|1.7-1.8|>Vmem_s×5%=0.09, which indicates that the fluctuation of the FLASH working voltage is too large, the program prohibits the module from performing FLASH write operation during data transmission, and the risk of memory loss is minimized;

[0103] Step a7, Vbat_tx=3.35V<VBAT_min=3.4V, the current transmission power is reduced from 23dBm to 22.5dBm, Vbat_tx=3.42V and Vmem_tx=1.72V are detected again, P_tx=22.5dBm, the judgment condition is met, the limit P_B39_safe=22.5dBm, and the module is controlled to operate in the power limit according to 22.5dBm in the B39 frequency band;

[0104] Step a9, when the network frequency band is switched to B40, return to step a4, the initialized P_B40_safe=22.5dBm after B40, and ΔVbat_B40=0.35V, which does not meet the working condition, P_B40_safe=21.5dBm is calculated according to ΔV_B40=A2×P+B3=ΔV_work=0.25V, data transmission is performed again, Vbat_tx=3.46V and Vmem_tx=1.75V are detected, P_tx=21.3dBm, which meets the module safe operation requirement, and the status is maintained, the module is controlled to operate in the power limit according to 21.3dBm in the B40 frequency band.

[0105] As described above, in the embodiment, in the process of data transmission of the communication module, when the minimum working voltage of the storage chip or the minimum supply voltage of the communication module does not meet the corresponding safety requirement, the transmission power of the radio frequency power amplifier chip is reduced, the drop amplitude of the module supply voltage is reduced, the fluctuation amplitude of the working voltage of the storage chip is reduced, and the minimum supply voltage of the communication module and the minimum working voltage of the storage chip meet the corresponding safety requirement. The current transmission power of the radio frequency power amplifier chip is obtained as the second safety transmission power, so that the communication module is controlled to operate in the power limit according to the second safety transmission power, and the voltage drop problem and the memory loss problem in the vehicle-mounted environment can be solved, and the communication module can work in the safe voltage range.

[0106] Referring to Figure 6 , the embodiment of the application also provides a safe operation method of a vehicle-grade cellular communication module, Figure 6 and Figure 3 The difference between the method and the method of the prior art is that, before step S303 in the method, Figure 3 , the method further includes Figure 6Steps S601 to S604 in the method are used for generating a specific preset correspondence relationship between the transmission power of each frequency band and the voltage drop value, which can also be understood as an initialization process of the communication module.

[0107] Step S601: Collect the initial supply voltage of the communication module and the initial working voltage of the storage chip when the communication module is powered on during the vehicle debugging process.

[0108] Step S602: Control the radio frequency power amplification chip to transmit according to the maximum set power of each frequency band, so as to obtain the minimum supply voltage of the communication module and the minimum working voltage of the storage chip under each frequency band.

[0109] Step S603: Determine the maximum safe transmission power of the communication module in each frequency band according to the minimum supply voltage of the communication module, the minimum working voltage of the storage chip, the initial working voltage of the storage chip and the preset lower limit of the supply voltage.

[0110] Specifically, it can be determined whether the minimum supply voltage of the communication module and the minimum working voltage of the storage chip under each frequency band meet the corresponding safety requirements (refer to the above), and for any frequency band: in the case that the minimum supply voltage of the communication module and the minimum working voltage of the storage chip under the frequency band both meet the corresponding safety requirements, the maximum set transmission power of the frequency band is determined as the maximum safe transmission power thereof; in the case that the minimum supply voltage of the communication module or the minimum working voltage of the storage chip under the frequency band does not meet the corresponding safety requirements, the transmission power of the radio frequency power amplification chip is reduced; control the communication module to transmit according to the reduced transmission power until the minimum supply voltage of the communication module and the minimum working voltage of the storage chip both meet the preset safety requirements, obtain the current transmission power of the radio frequency power amplification chip, and obtain the maximum safe transmission power of the frequency band.

[0111] Step S604: Control the radio frequency power amplification chip to transmit according to the power gradient within the maximum safe transmission power of each frequency band, so as to obtain the preset correspondence relationship between the transmission power of each frequency band and the voltage drop value.

[0112] The voltage drop value corresponding to the first transmission power of the first frequency band is equal to the difference between the initial supply voltage of the communication module and the minimum supply voltage of the communication module under the first frequency band based on the first transmission power.

[0113] The following is based on the hardware configuration of the automotive-grade cellular communication module in Figure 1 and Figure 2 , and the initialization process in Figure 7 is used as an example to illustrate the initialization process in Figure 6 .

[0114] Step b1, after the circuit board with the module is assembled in the vehicle environment, start the initialization;

[0115] Step b2, the vehicle circuit board supplies power to the communication module VABT pin, and starts running;

[0116] Step b3, the module ADC0 interface detects and records the VBAT voltage value Vbat_s (i.e. the initial power supply voltage of the module), and the ADC1 interface detects and records the VDD_FLASH voltage value Vmem_s (i.e. the initial working voltage of the storage chip);

[0117] Step b4, the module controls the radio frequency bands to transmit at the maximum set power at this time, the module ADC0 interface detects the VBAT voltage value, and records the minimum voltage value Vbat_BX_min of each frequency band, and the module ADC1 interface detects the VDD_FLASH voltage value, and records the minimum voltage value Vmem_BX_min of each frequency band;

[0118] Step b5, if Vbat_BX_min < VBAT_min (the minimum value of the module voltage, i.e. the lower limit of the preset power supply voltage), at this time the voltage drop caused by radio frequency transmission makes the module working voltage lower than the minimum value, then record the frequency band information, reduce the maximum transmission power P1 of the frequency band, return to step b4, and the module controls the radio frequency bands to transmit at the reduced power until Vbat_BX_min ≥ VBAT_min;

[0119] Step b6, if |Vmem_BX_min-Vmem_s|>Vmem_s×5% (5% fluctuation of the FLASH working voltage), at this time the FLASH working voltage fluctuation caused by radio frequency transmission is in the risk range, then record the frequency band information, reduce the maximum transmission power P1 of the frequency band, return to step b4, and the module controls the radio frequency bands to transmit at the reduced power until |Vmem_BX_min-Vmem_s|≤Vmem_s×5%;

[0120] Step b7, if Vbat_BX_min ≥ VBAT_min and |Vmem_BX_min-Vmem_s|≤Vmem_s×5%, calculate and store the voltage drop value ΔVbat_BX_safe = Vbat_s-Vbat_BX_min of each frequency band, and the maximum safe transmission power P_BX_safe;

[0121] Step b8, the module controls the radio frequency bands to transmit within the corresponding maximum safe transmission power range according to the power gradient, the module ADC0 interface detects the VBAT voltage value, and records the minimum voltage value Vbat_BX_min of each frequency band;

[0122] Step b9: Determine the fitting formula based on the actual transmit power and the corresponding VBAT voltage drop value. ΔV_BX = A × P + B, where ΔV_BX is the VBAT voltage drop value for each frequency band, P is the RF transmit power, and A and B are constants fitted from the test parameters of the current module.

[0123] In a specific implementation, substituting the values into the above steps b1 - b9, we can obtain:

[0124] Step b1: The vehicle circuit board equipped with the 4G vehicle-scale module enters the vehicle head unit and enters the debugging process.

[0125] Step b2: The vehicle circuit board supplies power to the communication module VABT and starts running.

[0126] Step b3: In the standby state, the detected VBAT voltage value is 3.8V, and the VDD_FLASH voltage value is 1.8V.

[0127] Step b4: The SIM card uses the eSIM chip of China Mobile, supporting frequency bands B3 / B39 / B40 / B41. Taking B39 as an example, control the transmission at the maximum power of 23dBm. The detected minimum VBAT voltage value is 3.6V, and the VDD_FLASH voltage value is 1.78V. Taking B40 as an example, control the transmission at the maximum power of 23dBm. The detected minimum VBAT voltage value is 3.3V, and the VDD_FLASH voltage value is 1.7V.

[0128] Steps b5 - b7:

[0129] For the B39 frequency band, Vbat_B39_min = 3.6V > VBAT_min = 3.4V and

[0130] |Vmem_BX_min - Vmem_s| = |1.78V - 1.8V| < Vmem_s × 5% = 0.09V, then the safe maximum transmit power for the B39 frequency band is P_B39_safe = 23dBm;

[0131] For the B40 frequency band, Vbat_B40_min = 3.3V < VBAT_min = 3.​​Step b8, for B39 frequency band, the module controls the transmission power below 23dBm to transmit according to 0.5dBm as the gradient, and records the transmission power and voltage drop value, such as P_B39=23dBm / ΔVbat_B39=0.2V, P_B39=22.5dBm / ΔVbat_B39=0.18V..., P_B39=10.5dBm / ΔVbat_B39=0.05V;

[0133] Step b9, the relationship between the actual transmission power and the voltage drop value is determined to determine the fitting formula ΔV_B39=A1×P+B1. For B3 / B40 / B41 frequency band, the same process is carried out.

[0134] As described above, in the initialization process of the vehicle-level cellular communication module in the embodiment, the maximum safe transmission power of the communication module in each frequency band is determined according to the minimum supply voltage of the communication module in each frequency band, the minimum working voltage of the storage chip, the initial working voltage of the storage chip and the preset lower limit of the supply voltage; then, within the maximum safe transmission power of each frequency band, the radio frequency power amplifier chip is controlled to transmit according to the power gradient, and the preset corresponding relationship between the transmission power and the voltage drop value corresponding to each frequency band is obtained. Therefore, any transmission power in the preset corresponding relationship between the transmission power and the voltage drop value corresponding to each frequency band is lower than or equal to the maximum safe transmission power in the frequency band.

[0135] As described above, the safe operation of the vehicle-level cellular communication module in the embodiment of the application combines the actual vehicle application scenario, and solves the problems of voltage drop, memory loss and power impact in the vehicle environment through the hardware circuit configuration and software process design inside the module, thereby improving the reliability of the operation of the vehicle-level cellular communication module.

[0136] Figure 8 is a structure diagram of a safe operation device of a vehicle-level cellular communication module provided by the embodiment of the application. As shown in Figure 8 the device can include a collection module 801, a calculation module 802, a first acquisition module 803, a second acquisition module 804 and a running control module 805.

[0137] The collection module 801 is configured to collect the supply voltage when the communication module is powered on and operated during vehicle driving;

[0138] The calculation module 802 is configured to obtain a first voltage drop value according to the supply voltage and a preset lower limit of the supply voltage;

[0139] The first acquisition module 803 is configured to acquire the current working frequency band of the communication module, and a first preset corresponding relationship between the transmission power and the voltage drop value corresponding to the current working frequency band;

[0140] The second obtaining module 804 is configured to obtain, according to the first preset correspondence relationship, a transmission power corresponding to the first voltage drop value, to obtain a first safe transmission power.

[0141] The running control module 805 is configured to control the communication module to perform power-limited running according to the first safe transmission power.

[0142] The first preset correspondence relationship corresponding to the current working frequency band is determined by the communication module in a vehicle-mounted debugging process at a plurality of sets of transmission powers and corresponding voltage drop values under the maximum safe transmission power of the current working frequency band.

[0143] Figure 9 A hardware structure schematic diagram of a controller provided by an embodiment of the application is shown, which can include a processor 901 and a memory 902 storing computer program instructions.

[0144] Specifically, the processor 901 can include a central processing unit (CPU), or a specific integrated circuit (ASIC), or can be configured to implement one or more integrated circuits of the embodiment of the application.

[0145] The memory 902 can include a mass storage for data or instructions. By way of example and not limitation, the memory 902 can include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In one example, the memory 902 can include a removable or non-removable (or fixed) medium, or the memory 902 is a non-volatile solid-state memory. The memory 902 can be internal or external to the integrated gateway disaster recovery device.

[0146] In one example, the memory 902 can be a read-only memory (ROM). In one example, the ROM can be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0147] The memory 902 can include read-only memory (ROM), random-access memory (RAM), magnetic disk storage mediums, optical storage mediums, flash memory devices, electrical, optical, or other physical / tangible memory storage devices. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software that, when executed (by one or more processors), is operable to perform the operations described with reference to the methods according to an aspect of the present disclosure.

[0148] The processor 901 implements functions by reading and executing computer program instructions stored in the memory 902. Figures 3-7 The method for safe operation of the car-grade cellular communication module in the illustrated embodiment.

[0149] In one example, the controller can also include a communication interface 903 and a bus 904. Wherein, as shown, the processor 901, the memory 902, the communication interface 903 are connected through the bus 904 and complete the communication between each other. Figure 9 As shown, the processor 901, the memory 902, the communication interface 903 are connected through the bus 904 and complete the communication between each other.

[0150] The communication interface 903 is mainly used to realize the communication between each module, device, unit and / or equipment in the embodiment of the present application.

[0151] The bus 904 includes hardware, software or both to couple components of the online data traffic billing device to each other. By way of example, and not limitation, the bus can include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association local (VLB) bus, or another suitable bus or a combination of two or more of these. Where suitable, the bus 304 can include one or more buses. Although specific buses are described and illustrated, the present application contemplates any suitable bus or interconnect.

[0152] The controller can be integrated in Figure 1 and Figure 2In the baseband chip shown in the figure, the safe operation method of the automotive-grade cellular communication module in the embodiment of the application is performed in combination with Figure 1 and Figure 2 The hardware configuration implements the safe operation method of the automotive-grade cellular communication module.

[0153] In addition, in combination with the safe operation method of the automotive-grade cellular communication module in the above embodiment, the embodiment of the application can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; the computer program instructions are executed by a processor to implement any one of the safe operation methods of the automotive-grade cellular communication module in the above embodiments.

[0154] It should be clear that the application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of well-known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after understanding the spirit of the application.

[0155] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, etc. When implemented in software, the elements of the application are program or code segments used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted on a transmission medium or communication link through a data signal carried in a carrier wave. The "machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, read-only memory (ROM), flash memory, erasable read-only memory (EROM), floppy disks, compact discs (CD-ROM), optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. Code segments can be downloaded via a computer network such as the Internet, an intranet, etc.

[0156] It is also important to note that the examples mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the examples, or in an order different from the examples, or several steps can be performed simultaneously.

[0157] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0158] The above only describes specific implementation of the present application. For the convenience and brevity of description, the specific working processes of the above-described system, module and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein. It should be understood that the protection scope of the present application is not limited in this way. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A method for secure operation of an automotive-grade cellular communication module, the method comprising: The method comprises: ​ collecting a supply voltage when the communication module is powered on during vehicle driving; obtaining a first voltage drop value according to the supply voltage and a preset lower limit of the supply voltage; obtaining a first preset correspondence relationship between a current working frequency band of the communication module and a first preset correspondence relationship between a corresponding transmission power and a voltage drop value corresponding to the current working frequency band; obtaining a first safe transmission power corresponding to the first voltage drop value according to the first preset correspondence relationship; controlling the communication module to perform power-limited operation according to the first safe transmission power; wherein the first preset correspondence relationship corresponding to the current working frequency band is determined by a plurality of sets of transmission power and corresponding voltage drop values of the communication module at the maximum safe transmission power of the current working frequency band during vehicle debugging.

2. The method of claim 1, wherein, The communication module is integrated with a storage chip and a radio frequency power amplification chip, and the method further comprises: during data transmission of the communication module, obtaining a minimum supply voltage of the communication module, a minimum working voltage of the storage chip and a current transmission power of the radio frequency power amplification chip; determining whether the minimum working voltage of the storage chip and the minimum supply voltage of the communication module both meet corresponding safety requirements; in the case that the minimum supply voltage of the communication module and the minimum working voltage of the storage chip both meet corresponding safety requirements, controlling the communication module to perform power-limited operation according to the first safe transmission power; wherein the safety requirement corresponding to the minimum supply voltage of the communication module is used to indicate that the minimum supply voltage of the communication module is greater than or equal to the preset lower limit of the supply voltage; the safety requirement corresponding to the minimum working voltage of the storage chip is used to indicate that the absolute value of the difference between the minimum working voltage of the storage chip and an initial working voltage is less than or equal to a preset voltage fluctuation threshold, and the initial working voltage is used to indicate the working voltage of the storage chip when the communication module is powered on during vehicle debugging.

3. The method of claim 2, wherein, The method further comprises: in the case that the minimum working voltage of the storage chip or the minimum supply voltage of the communication module does not meet the corresponding safety requirement, reducing the transmission power of the radio frequency power amplification chip; controlling the communication module to perform data transmission according to the reduced transmission power until the minimum supply voltage of the communication module and the minimum working voltage of the storage chip both meet the corresponding safety requirements, obtaining the current transmission power of the radio frequency power amplification chip to obtain a second safe transmission power; controlling the communication module to perform power-limited operation according to the second safe transmission power.

4. The method of claim 2, wherein, The method further comprises: in the case that the minimum working voltage of the storage chip does not meet the corresponding safety requirement, prohibiting the communication module from performing write operation on the storage chip.

5. The method of claim 1, wherein, The communication module is integrated with a radio frequency power amplification chip and a storage chip, and before the obtaining of the first preset correspondence relationship between the current working frequency band of the communication module and the corresponding transmission power and voltage drop value corresponding to the current working frequency band, the method further comprises: Collect the initial supply voltage of the communication module and the initial working voltage of the storage chip when the communication module is powered on during the vehicle debugging process; Control the radio frequency power amplifier chip to transmit according to the maximum set power of each frequency band, and obtain the minimum supply voltage of the communication module and the minimum working voltage of the storage chip under each frequency band; Determine the maximum safe transmission power of the communication module in each frequency band according to the minimum supply voltage of the communication module, the minimum working voltage of the storage chip, the initial working voltage of the storage chip, and the preset lower limit of the supply voltage. Within the maximum safe transmission power of each frequency band, control the radio frequency power amplifier chip to transmit according to the power gradient, and obtain the preset corresponding relationship between the transmission power and the voltage drop value corresponding to each frequency band, wherein the voltage drop value corresponding to the first transmission power of the first frequency band is equal to the difference between the initial supply voltage of the communication module and the minimum supply voltage of the communication module based on the first transmission power in the first frequency band.

6. The method of claim 5, wherein, The method further comprises: Determine whether the minimum supply voltage of the communication module and the minimum working voltage of the storage chip in each frequency band meet the corresponding safety requirements respectively; For any frequency band, if the minimum supply voltage of the communication module and the minimum working voltage of the storage chip in the frequency band both meet the corresponding safety requirements, determine the maximum set transmission power of the frequency band as its maximum safe transmission power; The safety requirement corresponding to the minimum supply voltage of the communication module is used to indicate that the minimum supply voltage of the communication module is greater than or equal to the preset lower limit of the supply voltage; The safety requirement corresponding to the minimum working voltage of the storage chip is used to indicate that the absolute value of the difference between the minimum working voltage and the initial working voltage of the storage chip is less than or equal to the preset voltage fluctuation threshold.

7. The method of claim 6, wherein, The method further comprises: For any frequency band, if the minimum supply voltage of the communication module or the minimum working voltage of the storage chip in the frequency band does not meet the corresponding safety requirement, reduce the transmission power of the radio frequency power amplifier chip; Control the communication module to transmit according to the reduced transmission power until the minimum supply voltage of the communication module and the minimum working voltage of the storage chip both meet the preset safety requirement, obtain the current transmission power of the radio frequency power amplifier chip, and obtain the maximum safe transmission power of the frequency band.

8. The method of claim 1, wherein, The method further comprises: In response to a change in the working frequency band of the communication module, obtain a new current working frequency band and a second preset corresponding relationship between the transmission power and the voltage drop value corresponding to the new current working frequency band; Obtain the transmission power corresponding to the first voltage drop value according to the second preset corresponding relationship, and obtain a third safe transmission power; Control the communication module to operate at limited power according to the third safe transmission power.

9. The method of claim 1, wherein, The method further comprises: In a case where the first voltage drop value is less than a preset voltage drop threshold, output prompt information indicating that the supply voltage of the communication module is at risk.

10. A secure operation apparatus of a car-grade cellular communication module, characterized by, The method comprises: a collection module configured to collect a supply voltage of the communication module when the communication module is powered on during vehicle driving; a calculation module configured to obtain a first voltage drop value according to the supply voltage and a preset lower limit of the supply voltage; a first acquisition module configured to acquire a current operating frequency band of the communication module, and a first preset correspondence relationship between a transmission power and a voltage drop value corresponding to the current operating frequency band; a second acquisition module configured to acquire a transmission power corresponding to the first voltage drop value according to the first preset correspondence relationship, and obtain a first safe transmission power; a running control module configured to control the communication module to perform power-limited running according to the first safe transmission power. The first preset correspondence relationship corresponding to the current operating frequency band is determined by a plurality of sets of transmission powers and corresponding voltage drop values of the communication module at a maximum safe transmission power of the current operating frequency band during vehicle debugging.

11. A controller characterized by comprising: The method comprises: at least one processor; and a storage chip in communication connection with the at least one processor; wherein the storage chip stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the safety running method of the automotive-grade cellular communication module according to any one of claims 1-9.

12. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for causing a computer to execute the safety running method of the automotive-grade cellular communication module according to any one of claims 1-9.

13. A car-grade cellular communication module, characterized by, The communication module integrates a baseband chip, a radio frequency power amplification chip and the controller according to claim 11; the baseband chip integrates a storage chip, a radio frequency transceiver chip and a power management chip; a VBAT pin of the communication module is connected to a VCC pin of the baseband chip; a first ADC pin of the baseband chip is connected to a line between the VBAT pin of the communication module and the VCC pin of the baseband chip, for collecting a supply voltage of the communication module; a second ADC pin of the baseband chip is connected to a first VDD pin of the baseband chip, for collecting an operating voltage of the storage chip; a second VDD pin of the baseband chip is connected to a VCC pin of the radio frequency power amplification chip, for supplying power to the radio frequency power amplification chip; a MIPI interface of the baseband chip is electrically connected to the radio frequency power amplification chip, for controlling a transmission power of the radio frequency power amplification chip.

14. The automotive-grade cellular communication module of claim 13, wherein, The communication module further integrates a protection circuit, which is arranged on a line between the VBAT pin of the communication module and the VCC pin of the baseband chip; the protection circuit is composed of one or more of the following devices in series: a Zener diode, a bidirectional TVS tube and a current-limiting mos tube.

15. A car-grade cellular communication module, characterized by, The communication module is integrated with a baseband chip, a power management chip, a storage chip, a radio frequency transceiver chip, a radio frequency power amplifier chip and the controller of claim 11. A VBAT pin of the communication module is connected to a VCC pin of the power management chip. A first VDD pin of the power management chip is connected to a VCC pin of the baseband chip. A second VDD pin of the power management chip is connected to a VCC pin of the storage chip. A third VDD pin of the power management chip is connected to a VCC pin of the radio frequency transceiver chip. A fourth VDD pin of the power management chip is connected to a VCC pin of the radio frequency power amplifier chip. A first ADC pin of the baseband chip is connected to a line between the VBAT pin of the communication module and the VCC pin of the power management chip, for collecting the supply voltage of the communication module. A second ADC pin of the baseband chip is connected to a line between the second VDD pin of the power management chip and the VCC pin of the storage chip, for collecting the working voltage of the storage chip. A first MIPI interface of the baseband chip is electrically connected to the radio frequency transceiver chip, and a second MIPI interface of the baseband chip is electrically connected to the radio frequency power amplifier chip, for controlling the transmission power of the radio frequency power amplifier chip.

16. The automotive-grade cellular communication module of claim 15, wherein, The communication module is further integrated with a protection circuit, which is arranged on a line between the VBAT pin of the communication module and the VCC pin of the power management chip; the protection circuit is composed of one or more of the following devices in series: a Zener diode, a bidirectional TVS tube and a current-limiting mos tube.

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