CN117871967A - Method for representing PEPS key low-frequency field intensity - Google Patents
Method for representing PEPS key low-frequency field intensity Download PDFInfo
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- CN117871967A CN117871967A CN202311808044.2A CN202311808044A CN117871967A CN 117871967 A CN117871967 A CN 117871967A CN 202311808044 A CN202311808044 A CN 202311808044A CN 117871967 A CN117871967 A CN 117871967A
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Abstract
The invention discloses a method for representing the low-frequency field intensity of a PEPS key, which comprises the following steps: the method comprises the steps of collecting low-frequency data sent by a vehicle-mounted low-frequency base station, calculating a corresponding field intensity value, converting the field intensity value into a voltage value, and sending the voltage value corresponding to the key field intensity value in a high-frequency data mode through a high-frequency frame. The invention has the advantages that: the field intensity expressed by the voltage is adopted, so that the data length of the high-frequency frame is shortened, the transmitting time of the high-frequency frame is saved, and the static power consumption of the whole vehicle is reduced. Meanwhile, the voltage precision can reach microvolts, the field intensity precision is higher, the key positioning is more accurate, and the user experience is better.
Description
Technical Field
The invention relates to the field of PEPS keys of automobiles, in particular to a PEPS key low-frequency field intensity representation method and a PEPS interaction method.
Background
At present, the development trend of automobile control is that from the previous more common key keys, the key is developed towards the more convenient PEPS intelligent key, and the key is positioned by using the field intensity value of the low-frequency antenna, but the static power consumption of the key is increased, the field intensity precision requirement on the key is increased, so that the service life of a key battery is shortened, and the static power consumption of the whole automobile is increased. Under the background, the precision of the low-frequency field intensity is improved, the emission length of high-frequency data of the key is reduced, and the power consumption of the key is especially important.
In the traditional key low-frequency field intensity method, the field intensity of one antenna is represented by floating point type, and the field intensity of one antenna needs to be represented by 3 bytes. If the vehicle uses 5 antennas, 15 bytes are needed to represent, which causes the data length of the high-frequency reply frame of the key to be increased, thereby causing the time of the high-frequency reply frame to be increased, and simultaneously, the time of the receiving end for receiving the data also correspondingly becomes longer, thereby causing the function response time of the PEPS to become longer and the user experience to be poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for representing the low-frequency field intensity of a PEPS key and a PEPS interaction method, wherein the field intensity is represented in a voltage mode and PEPS interaction is carried out, so that response time is shortened and accuracy is improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a method for indicating a PEPS key low frequency field strength, comprising: the method comprises the steps of collecting low-frequency data sent by a vehicle-mounted low-frequency base station, calculating a corresponding field intensity value, converting the field intensity value into a voltage value, and sending the voltage value corresponding to the key field intensity value in a high-frequency data mode through a high-frequency frame.
After the low-frequency data is received, waiting for the low-frequency field intensity to be stable, firstly collecting the field intensity of background noise, respectively collecting the field intensity values of X/Y/Z3 channels, and finally calculating the total field intensity value and removing the noise field intensity to obtain the field intensity value corresponding to the PEPS system.
And converting the field intensity value of the floating point type into a voltage value by using a voltage conversion formula.
And the receiving end of the vehicle receives the corresponding field intensity value expressed by the voltage, judges the PEPS key position and executes the corresponding control function.
The low-frequency field intensity data is converted by adopting AD sampling to obtain an AD value after AD adoption.
And amplifying the low-voltage field intensity data by a set multiple, then carrying out AD sampling, dividing the low-voltage field intensity data by the amplification multiple after sampling is completed to obtain an AD sampling value, and taking an average value based on multiple AD sampling as an AD value.
And each antenna is provided with X, Y, Z low-frequency data acquisition of three channels, and the field intensity value corresponding to the antenna is obtained based on the square sum of the data of the three channels and then the root number is taken.
The field intensity value is converted into a voltage value by adopting a voltage conversion formula, wherein the office voltage conversion formula is as follows:
wherein: RSSIRAW is the AD value of the sampling corresponding to the low-frequency field intensity value; offset: an AD value corresponding to the background noise field intensity value; VREF is the reference voltage and GRSSI is the amplification factor.
The high frequency signal of the voltage value representing the field intensity value transmitted by the PEPS key is received by the vehicle-mounted device, the key position is judged according to the voltage value, and whether the PEPS function is executed or not is determined based on the position.
The invention has the advantages that: the field intensity expressed by the voltage is adopted, so that the data length of the high-frequency frame is shortened, the transmitting time of the high-frequency frame is saved, and the static power consumption of the whole vehicle is reduced. Meanwhile, the voltage precision can reach microvolts, the field intensity precision is higher, the key positioning is more accurate, and the user experience is better.
Drawings
The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:
FIG. 1 is a schematic diagram of a low frequency carrier signal with a low frequency carrier field strength sampling timing;
FIG. 2 is a flow chart of an AD sampling method of background noise field intensity;
FIG. 3 is a flow chart of the field strength value sampling principle of a single channel;
Detailed Description
The following detailed description of the invention refers to the accompanying drawings, which illustrate preferred embodiments of the invention in further detail.
The invention relates to the PEPS interaction field, which is characterized in that a built-in antenna is used for collecting low-frequency signals in PEPS, a built-in AD chip is used for sampling low-frequency field intensity, an MCU in the PEPS is used for converting field intensity values, and then an MCU controller is used for controlling a high-frequency antenna in a PEPS key to send data to a vehicle for execution, wherein the core point of the PEPS interaction field is that the field intensity values are converted into voltage values for representation, and the specific principle comprises the following steps:
the invention discloses a voltage representation method based on PEPS key low-frequency field intensity. The low-frequency field intensity representation method mainly comprises background noise field intensity collection of low-frequency field intensity, field intensity collection of X/Y/Z3 channels and how to calculate the value of key field intensity. The method is mainly used for identifying the position of the key, realizes the position judgment of the inside and the outside of the vehicle, and better reflects the low-frequency field intensity precision of the key, thereby identifying the position of the key more accurately.
The voltage representation method of the low-frequency field intensity mainly comprises data acquisition of the low-frequency field intensity and conversion from a low-frequency field intensity value to a voltage value. Because the traditional low-frequency field intensity is represented by floating point, software floating point operation is longer in time for calculating the field intensity for the MCU of the key. The floating point data occupy too many bytes, the data length of the high-frequency frame replied by the key is longer, and the power consumption of the high-frequency transmission of the single-frame data of the key is increased, so that the service life of the battery is shortened. The number of occupied bytes is reduced by the voltage representation method, the data length of the high-frequency frame recovered by the key is correspondingly reduced, the transmitting power consumption of the high-frequency frame of the single-frame data is correspondingly reduced, and the service life of the battery is prolonged.
The method comprises the steps of collecting field intensity background noise on software, calculating AD values of X/Y/Z3 channels, calculating field intensity to eliminate the influence of the background noise, calculating the field intensity value of each channel, calculating the total field intensity value, and converting the total field intensity value into a voltage value for representation through a formula.
Aiming at the increasingly popular demands of the intelligent keys of the current automobiles, the static power consumption of the keys and the whole automobile needs to be reduced, and the precision of the positioning of the low-frequency field intensity needs to be improved. The voltage is used for representing the field intensity value from software, the content length of the high-frequency reply of the key is reduced, the transmitting power consumption of the high-frequency frame is reduced, and the service life of the battery is prolonged. The specific scheme is implemented as follows:
firstly, after the low-frequency data is received, waiting for the low-frequency field intensity to be stable, firstly collecting the field intensity of background noise, respectively collecting the field intensity values of X/Y/Z3 channels, and finally calculating the total field intensity value. Converting the floating point type field intensity value into a voltage value by using a voltage conversion formula, and then sequentially collecting the field intensity values of other antennas. The key software feeds back the collected field intensity values of all channels to the vehicle body receiving end through the high-frequency frame, and the vehicle body receiving end judges the position of the key after receiving the high-frequency data and executes corresponding functions. The field intensity method of the voltage representation shortens the data length of the high-frequency frame, saves the transmitting time of the high-frequency frame and reduces the static power consumption of the whole vehicle.
Secondly, the traditional floating point representation method has small low-frequency field intensity value beyond 2 meters and is close to 0, and has great influence on the guest-welcoming area and PE unlocking function judgment. Based on the voltage representation method, the voltage precision can reach microvolts, the field intensity precision is higher, the key positioning is more accurate, and the user experience is better.
A low frequency carrier signal schematic diagram of a low frequency carrier field strength sampling timing is shown in fig. 1; wherein T1 is waiting for field intensity stabilization time; t2, starting sampling waiting time; t3, collecting background field intensity; and T4 is that the field intensity of the channel 1 is acquired T5, the field intensity of the channel 2 is acquired T5, and the field intensity of the channel 3 is acquired.
The AD is used for sampling the value of the low-frequency field intensity, the voltage value of the actual low-frequency field intensity is very small, and software needs to select different amplification factors of-18 dB to 54dB according to the actual low-frequency field intensity.
The low-frequency field intensity is larger in the field intensity value acquired when the low-frequency field intensity is closer to the low-frequency antenna, the amplitude of the decrease of the low-frequency field intensity value along with the increase of the distance is larger, and the decrease amplitude is close to 1/x3. The software needs to amplify the low-frequency field intensity signal by a certain multiple before collecting, and divide the signal by the amplified multiple after the collection is completed. Software typically selects a method of sampling multiple times to average to reduce sampling errors.
The voltage value of the low frequency field strength is calculated by the following formula,
wherein: RSSIRAW: sampled AD value; offset: AD value of background noise;
VREF:1.25V, GRSSI: coefficients of-18 Db to 54Db, as shown in the table below.
| Range | Nominal gain | GRSSI |
| 54dB | +54dB | 543.25 |
| 36dB | +36dB | 66.069 |
| 18dB | +18dB | 8.128 |
| 0dB | 0dB | 0.861 |
| -18dB | -18dB | 0.122 |
Voltage conversion represents:
each antenna is represented by 10 bits (bits), 2 bits are units, and 8 bits are numerical values.
The unit values correspond to the following:
the maximum field strength voltage value that can be represented by the 10-bit value is as follows:
0x3FF, unit: 11, 1280 μv, numerical: 1111 1111, 255.
The field strength voltage value is calculated as follows:
255x 4864μV＝1240320μV＝1240.32mV＝1.24032V。
fig. 2 is a method for sampling background noise low-frequency field intensity, comprising the following steps: firstly, collecting a low-frequency carrier background field intensity signal, then checking whether a voltage value is normal, initializing an AD function and a field intensity module when the voltage value is normal, waiting for the initialization to be completed, taking an average value after adopting the AD value for a plurality of times, and returning to the background noise low-frequency field intensity.
FIG. 3 is a flow chart of a principle of sampling field intensity values of a single channel, collecting field intensity data of a single channel of a low-frequency carrier wave, setting field intensity gain to be a maximum value of 54db, selecting a sampling channel, waiting for the completion of channel setting, performing field intensity gain range selection attempt, setting gain values according to range return values of the gain, waiting for the completion of gain setting, collecting field intensity AD values of the channel, sampling for a plurality of times to obtain an average value, and then converting the average value into a voltage value of the field intensity by a formula and returning.
It is obvious that the specific implementation of the present invention is not limited by the above-mentioned modes, and that it is within the scope of protection of the present invention only to adopt various insubstantial modifications made by the method conception and technical scheme of the present invention.
Claims (9)
1. A method for representing the low-frequency field intensity of a PEPS key is characterized by comprising the following steps of: comprising the following steps: the method comprises the steps of collecting low-frequency data sent by a vehicle-mounted low-frequency base station, calculating a corresponding field intensity value, converting the field intensity value into a voltage value, and sending the voltage value corresponding to the key field intensity value in a high-frequency data mode through a high-frequency frame.
2. The method for indicating the low-frequency field strength of the PEPS key according to claim 1, wherein: after the low-frequency data is received, waiting for the low-frequency field intensity to be stable, firstly collecting the field intensity of background noise, respectively collecting the field intensity values of X/Y/Z3 channels, and finally calculating the total field intensity value and removing the noise field intensity to obtain the field intensity value corresponding to the PEPS system.
3. The method for indicating the low-frequency field strength of the PEPS key according to claim 2, wherein: and converting the field intensity value of the floating point type into a voltage value by using a voltage conversion formula.
4. The method for indicating the low-frequency field strength of the PEPS key according to claim 3, wherein: and the receiving end of the vehicle receives the corresponding field intensity value expressed by the voltage, judges the PEPS key position and executes the corresponding control function.
5. A method for indicating a PEPS key low frequency field strength according to any of claims 1-4, wherein: the low-frequency field intensity data is converted by adopting AD sampling to obtain an AD value after AD adoption.
6. The method for indicating the low-frequency field strength of the PEPS key according to claim 5, wherein: and amplifying the low-voltage field intensity data by a set multiple, then carrying out AD sampling, dividing the low-voltage field intensity data by the amplification multiple after sampling is completed to obtain an AD sampling value, and taking an average value based on multiple AD sampling as an AD value.
7. A method for indicating a PEPS key low frequency field strength according to any of claims 1-4, wherein: and each antenna is provided with X, Y, Z low-frequency data acquisition of three channels, and the field intensity value corresponding to the antenna is obtained based on the square sum of the data of the three channels and then the root number is taken.
8. A method for indicating a PEPS key low frequency field strength according to any of claims 1-7, wherein:
the field intensity value is converted into a voltage value by adopting a voltage conversion formula, wherein the office voltage conversion formula is as follows:
wherein: RSSIRAW is the AD value of the sampling corresponding to the low-frequency field intensity value; offset: an AD value corresponding to the background noise field intensity value; VREF is the reference voltage and GRSSI is the amplification factor.
9. A method for indicating a PEPS key low frequency field strength according to any of claims 1-7, wherein: the high frequency signal of the voltage value representing the field intensity value transmitted by the PEPS key is received by the vehicle-mounted device, the key position is judged according to the voltage value, and whether the PEPS function is executed or not is determined based on the position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311808044.2A CN117871967A (en) | 2023-12-26 | 2023-12-26 | Method for representing PEPS key low-frequency field intensity |
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| CN202311808044.2A CN117871967A (en) | 2023-12-26 | 2023-12-26 | Method for representing PEPS key low-frequency field intensity |
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