CN108973544B - Device for detecting tire pressure by using current - Google Patents
Device for detecting tire pressure by using current Download PDFInfo
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- CN108973544B CN108973544B CN201810936027.XA CN201810936027A CN108973544B CN 108973544 B CN108973544 B CN 108973544B CN 201810936027 A CN201810936027 A CN 201810936027A CN 108973544 B CN108973544 B CN 108973544B
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- sound signal
- driving current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0479—Communicating with external units being not part of the vehicle, e.g. tools for diagnostic, mobile phones, electronic keys or service stations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
- B60C23/0488—Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The present invention discloses an apparatus for detecting tire pressure using current, the apparatus comprising: a current detection circuit, a rotation speed sensor and a controller, wherein the controller is used for sending a slip instruction to a battery management system, so that the battery management system outputs a driving current to drive the tire to change from a static state to a slipping state, the rotating speed sensor is used for detecting the rotating speed of the electric automobile and sending the rotating speed to the controller, the current detection circuit, used for detecting the driving current output by the battery management system and sending the detected driving current to the controller, the controller obtains the driving current at the tire slip moment according to the rotating speed, and obtains the tire air pressure corresponding to the driving current at the time of tire slip from the driving current-air pressure function, thereby replacing the traditional direct detection mode, realizing the intelligent detection of the air pressure of the electric vehicle tyre by using the current, the cost is reduced, the detection accuracy is improved, and a driver can know the air pressure of the tire in real time conveniently.
Description
Technical Field
The invention relates to the technical field of tire detection, in particular to a device for detecting tire pressure by using current.
Background
With scientific and technological progress and rapid development of new energy technology, electric vehicles are more and more widely applied in the field of transportation. For electric vehicles, especially for electric vehicles with less pollution mostly adopted in small-range logistics transportation, the driving mileage is large, the vehicles in the transportation process are dense, and in order to achieve transportation safety, the electric vehicles need to be monitored in real time so that drivers can know the states of all parts of the vehicles in time.
Among many parts, the tire pressure is equivalent to the blood pressure of the electric vehicle, and the tire pressure is important to the performance and power of the electric vehicle. Data indicate that accidents caused by tire burst account for a very high percentage of the serious accidents, and the tire pressure deficiency is the leading cause of all the factors causing the tire burst. This is not a shrunken hearing, and it is therefore necessary to increase the attention on the tires of the vehicle to avoid serious injury to people and vehicles.
In the prior art, for the detection of the air pressure of electric vehicle tires, the direct type tire pressure monitoring device mostly adopts a direct type to detect the tire pressure, the direct type tire pressure monitoring device directly measures the air pressure of the tires by using a pressure sensor installed in each tire, a wireless transmitter is used to transmit pressure information from the inside of the tires to a central receiver module, and then the air pressure data of each tire is displayed.
The pressure sensor is built in the tire, the installation is complicated, and the wheel rotates during the running of the vehicle, so the measurement by the pressure sensor has errors, and the measurement is inaccurate. And the pressure sensor needs the battery power supply when the work, it can not directly get the electricity from the car, consequently, when pressure sensor does not have the electricity, the process of changing the battery is very complicated. In addition, the pressure sensor is expensive and may often fail.
Therefore, how to use a more advanced technical method to replace the traditional direct detection method to realize the intelligent detection of the tire pressure of the electric vehicle has become a problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems in the prior art, embodiments of the present invention provide a device for detecting tire pressure by using current, which can realize intelligent detection of tire pressure of an electric vehicle, so that a driver can know the tire pressure in real time.
In a first aspect, the present invention provides an apparatus for detecting tire air pressure using current, which is applied to air pressure detection of a tire of an electric vehicle, the apparatus comprising: the device comprises a current detection circuit, a rotating speed sensor and a controller;
the controller is used for sending a slip instruction to the battery management system so that the battery management system outputs a driving current to drive the tire to change from a static state to a slip state;
the rotating speed sensor is used for detecting the rotating speed of the electric automobile and sending the rotating speed to the controller;
the current detection circuit is used for detecting the driving current output by the battery management system and sending the detected driving current to the controller;
the controller is further used for obtaining the driving current at the tire slipping moment according to the rotating speed, and obtaining the tire air pressure corresponding to the driving current at the tire slipping moment through a driving current-air pressure function; the driving current-air pressure function is obtained in advance; the tire slip time corresponds to a time at which the rotation speed changes from 0 to non-0.
Optionally, the controller, which obtains the driving current-air pressure function in advance, specifically is:
the controller is used for respectively obtaining the driving currents at the tire slip moments corresponding to at least two air pressures, and the driving current-air pressure function is obtained through curve fitting of the at least two air pressures and the driving currents at the tire slip moments corresponding to the air pressures.
Optionally, the apparatus for detecting tire air pressure using electric current further includes: an electric quantity detection circuit;
the electric quantity detection circuit is used for obtaining the electricity consumption of the electric automobile in a unit stroke and sending the electricity consumption to the controller;
the controller is used for obtaining the tire air pressure corresponding to the electricity consumption through an electricity consumption-air pressure function; the electricity consumption-air pressure function is obtained in advance; the tire air pressure obtained from the used amount of electricity and the tire air pressure obtained from the drive current are compared and verified against each other.
Optionally, the controller, which obtains the power consumption-air pressure function in advance, specifically is:
the controller is used for respectively obtaining the power consumption of the unit strokes corresponding to the at least two air pressures, and the power consumption-air pressure function is obtained through curve fitting of the at least two air pressures and the power consumption of the unit strokes corresponding to the at least two air pressures.
Optionally, the apparatus for detecting tire air pressure using electric current further includes: a microphone module;
the microphone module is used for acquiring a sound signal of friction between the tire and a road surface;
the controller is used for carrying out spectrum analysis on the sound signal to obtain the frequency of the sound signal, and obtaining the tire air pressure corresponding to the frequency of the sound signal through a frequency-air pressure function; the frequency-air pressure function is obtained in advance; the tire air pressure obtained from the drive current and the tire air pressure obtained from the frequency of the sound signal are compared to each other for mutual verification.
Optionally, the apparatus for detecting tire air pressure using electric current further includes: a microphone module;
the microphone module is used for acquiring a sound signal of friction between the tire and a road surface;
the controller is used for carrying out spectrum analysis on the sound signal to obtain the frequency of the sound signal, and obtaining the tire air pressure corresponding to the frequency of the sound signal through a frequency-air pressure function; the frequency-air pressure function is obtained in advance; comparing any two of the tire air pressure obtained from the electric power consumption, the tire air pressure obtained from the driving current, and the tire air pressure obtained from the frequency of the sound signal to perform mutual verification.
Optionally, the microphone module is used for obtaining an acoustic signal of friction between the tire and a road surface at the tire slip moment;
the controller is further configured to, before performing a spectral analysis on the sound signal to obtain a frequency of the sound signal,
and screening out an audio fragment signal from the audio signal between the moment when the controller sends the slippage instruction to the battery management system and the moment when the controller sends the slippage stopping instruction to the battery management system.
Optionally, the microphone module is further configured to obtain a background sound signal in advance when the tire does not slip;
the controller is further configured to subtract the background sound signal from the sound signal before performing a spectrum analysis on the sound signal to obtain a frequency of the sound signal.
Optionally, the obtaining a background sound signal when the tire does not slip in advance includes:
obtaining background sound signals when the tire does not slip for multiple times in advance, and taking an average value of the background sound signals obtained for multiple times as a final background sound signal;
the controller subtracts the background sound signal from the sound signal, specifically:
the controller subtracts the final background sound signal from the sound signal.
Optionally, the controller sets a unique ID for the battery management system;
and the controller sends the slip instruction to the battery management system through the ID of the battery management system.
Optionally, the controller is located in the electric vehicle or in a remote server.
Optionally, the apparatus for detecting tire air pressure using electric current further includes: a remote server;
the controller is further used for sending the driving current to a remote server;
and the remote server is used for analyzing the driving current through a neural network to obtain a change curve of the current and obtaining the air pressure of the automobile tire according to the change curve.
Compared with the prior art, the invention has at least the following advantages:
the device for detecting the tire pressure by using the current provided by the embodiment of the application is applied to detecting the tire pressure of the electric automobile, wherein the detecting device comprises a current detecting circuit, a rotating speed sensor and a controller, the controller is used for sending a slip instruction to a battery management system so that the battery management system outputs a driving current to drive the tire to change from a static state to a slip state, the rotating speed sensor is used for detecting the rotating speed of the electric automobile and sending the rotating speed to the controller, the current detecting circuit is used for detecting the driving current output by the battery management system and sending the detected driving current to the controller, the controller obtains the driving current at the tire slip moment according to the rotating speed, and obtains the tire pressure corresponding to the driving current at the tire slip moment by a driving current-air pressure function, thereby replacing the traditional direct detecting mode, the intelligent detection of the air pressure of the electric vehicle tire by using the current is realized, the cost is reduced, the detection accuracy is improved, and a driver can know the air pressure of the tire in real time conveniently.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is an exemplary diagram of a motor vehicle tire in contact with a ground surface provided in an embodiment of the present application;
FIG. 2 is a block diagram of an apparatus for detecting tire pressure using current according to an embodiment of the present disclosure;
FIG. 3 is a block diagram of another apparatus for detecting tire pressure using current according to an embodiment of the present disclosure;
fig. 4 is a top view of a microphone module mounting position structure according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to facilitate understanding of the technical solutions provided by the present invention, the following briefly describes the background art of the technical solutions of the present invention.
As is well known, the level of tire pressure plays a crucial role in the performance and power of electric vehicles, and as electric vehicles are more and more widely used in transportation, how to accurately detect tire pressure has become a research hotspot in the field of automobiles. The inventor finds in research that currently, for the detection of the air pressure of electric vehicle tires with less pollution adopted in small-scale logistics transportation, most of the direct type tire pressure monitoring devices are adopted to detect the air pressure of the tires, and the direct type tire pressure monitoring devices directly measure the air pressure of the tires by using pressure sensors installed in each tire.
Because the pressure sensor is built in the tire, the installation process is more tedious, and in the measurement process, along with the rotation of wheel, the pressure sensor often can appear measuring error and self go wrong scheduling problem. In addition, the cost of the pressure sensor is high, and the cost of a single pressure sensor is generally between 500 yuan and 1500 yuan. Therefore, the traditional mode of detecting the tire pressure by using the pressure sensor is complex in operation, high in cost, low in accuracy and poor in experience for a driver.
The application of the technical scheme of the electric vehicle transportation system is that in a small-range logistics transportation environment, electric vehicles with small pollution are mostly adopted, the driving mileage is large, and the electric vehicles are also dense in the transportation process. As shown in fig. 1, which shows an example of the contact between a tire of an electric vehicle and the ground, during the driving of the electric vehicle, the friction force generated between the tire and the ground is different according to the air pressure of the tire, and thus the driving current required by the tire is different, and when the air pressure of the tire is higher, the friction force generated between the tire and the ground is smaller, and thus the driving current required by the tire is smaller; correspondingly, when the tire pressure is low, the friction force between the tire and the ground is high, and the driving current required by the tire is high.
Furthermore, the inventor has found that a Battery Management System (BMS) has a functional relationship between the driving current output from the tire and the tire pressure, when the tire pressure is higher, the Battery Management System only needs to output a smaller driving current to drive the tire from the stationary state to the slipping state, and when the tire pressure is lower, the Battery Management System only needs to output a larger driving current to drive the tire from the stationary state to the slipping state, that is, the tire pressure and the driving current output from the Battery Management System correspond to each other one to one, and the two are in an inverse relationship, so the tire pressure can be obtained according to the driving current.
Based on this, the embodiment of the application provides a device for detecting tire pressure by using current, a controller sends a slip instruction to a battery management system, so that the battery management system outputs a driving current to drive a tire to change from a static state to a slip state, a rotation speed sensor detects the rotation speed of an electric vehicle and sends the rotation speed to the controller, a current detection circuit detects the driving current output by the battery management system and sends the detected driving current to the controller, the controller obtains the driving current at the tire slip moment according to the rotation speed, and obtains the tire pressure corresponding to the driving current at the tire slip moment by using a driving current-pressure function, so that the intelligent detection of the tire pressure by using the current can be realized, and a driver can know the tire pressure in real time when driving the electric vehicle to transport goods in a small-range logistics transportation environment, and can judge whether the goods can be delivered to the destination on time according to the air pressure of the tires.
Example one
Hereinafter, an apparatus for detecting tire air pressure using current shown in exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings.
Referring to fig. 2, a block diagram of an apparatus for detecting tire pressure using current according to an embodiment of the present disclosure is shown.
The device provided by the embodiment of the application is applied to air pressure detection of the tire 204 of the electric automobile, wherein the tire 204 of the electric automobile refers to a tire of an electric automobile which is used in small-range logistics transportation and has less pollution, the driving distance is large, and vehicles in the transportation process are dense.
As shown in fig. 2, the apparatus for detecting tire air pressure using current according to the embodiment of the present application includes a controller 202, a rotation speed sensor 203, a current detection circuit 201, and a battery management system BMS 205.
The controller 202 is configured to send a slip command to the battery management system BMS205 (or the motor) so that the battery management system BMS205 (or the motor) outputs a driving current to drive the tire from a stationary state to a slip state.
The rotation speed sensor 203 is used for detecting the rotation speed of the electric vehicle and sending the rotation speed to the controller 202.
The current detection circuit 201 is configured to detect a driving current output from the battery management system BMS205 (or the motor) and transmit the detected driving current to the controller 202.
And the battery management system BMS105 is used for connecting the vehicle-mounted power battery and the electric automobile and realizing the functions of real-time monitoring of physical parameters of the battery, estimation of the state of the battery, online diagnosis and early warning of parts of the vehicle and the like.
The controller 202 may further be configured to obtain a driving current at the tire slip time according to the rotation speed, and obtain a tire pressure corresponding to the driving current at the tire slip time according to a driving current-air pressure function; the driving current-air pressure function is obtained in advance; the tire slip time corresponds to a time when the rotation speed changes from 0 to non-0. Meanwhile, the controller 202 may be a vehicle controller of the vehicle, or may be a controller separately provided from the vehicle controller, and the controller 102 may be located in the vehicle or may be located in a remote server.
In practice, the air pressure of a tire is a function of the drive current to which the tire is subjected from a stationary condition to a slipping condition, the drive current being output by the battery management system to the tire. When the tire pressure is higher, the battery management system only needs to output a smaller driving current to drive the tire to change from the static state to the slipping state, when the tire pressure is lower, the battery management system needs to output a larger driving current to drive the tire to change from the static state to the slipping state, and when the tire pressure is different, the battery management system needs to output different driving currents to the tire management system, namely, the tire pressure and the driving currents are in one-to-one correspondence.
In a specific implementation process, the driving current-air pressure function may be obtained in advance through a plurality of tests and stored in the controller, and when the controller obtains the driving current which is output to the tire by the battery management system and enables the tire to change from a stationary state to a slipping state, the controller may obtain the voltage of the tire corresponding to the driving current at the current tire slipping time according to the driving current-air pressure function. Here, the driving current may be a driving current of the tire at the time of the slip, which is obtained by the controller based on the rotation speed transmitted from the rotation speed sensor, and is detected by the current detection circuit and transmitted to the controller.
In some possible implementations of the present application, the driving current-air pressure function obtained by the controller in advance is specifically:
the controller is used for respectively obtaining the driving currents of the tire slip moments corresponding to at least two air pressures, and the driving current-air pressure function is obtained through curve fitting of the at least two air pressures and the driving currents of the tire slip moments corresponding to the air pressures.
In practical applications, curve fitting refers to selecting an appropriate curve type to fit the observed data, and analyzing the relationship between the two variables using a fitted curve equation. That is, a data processing method that approximately describes or simulates the functional relationship between coordinates represented by discrete point groups on a plane by using a continuous curve.
In the specific implementation process, the tire pressure of the electric automobile which leaves the factory and the driving current which is output by the battery management system and used for driving the tire to change from a static state to a slipping state are tested for multiple times in advance to obtain multiple discrete test data, and curve fitting is carried out by utilizing the multiple discrete test data, so that the functional relation between the driving current and the tire pressure is obtained. For example, the discrete test data of the driving current I and the corresponding tire air pressure P is obtained in advance as (I)0，P0)、(I1，P1) Etc., then a more appropriate type of curve may be selected to fit the obtained discrete test data of drive current I and corresponding tire pressure P, and finally a corresponding function may be selected as a function of drive current and tire pressure, e.g., a cubic Hermite spline, i.e., a drive current-air pressure function, based on the type of curve fitted.
It can be understood that there are many various components mounted on the vehicle, and therefore, the controller may need to control the operations of multiple components on the vehicle at the same time, and in order to ensure that the slip command sent by the controller can be accurately received by the battery management system, the embodiment of the present application sets an ID for the battery management system, so that the controller sends the slip command to the battery management system according to the specified ID.
In some possible implementations of the present application, the controller sets a unique ID for the battery management system; and the controller sends the slip instruction to the battery management system through the ID of the battery management system.
In practical application, the ID of the battery management system can be stored in the controller in advance, when the controller needs to send a slip command to the battery management system, the ID of the battery management system is obtained, and the slip command is sent to the battery management system through the ID of the battery management system, so that the working efficiency and the accuracy of sending the slip command are improved.
In the apparatus for detecting tire air pressure using electric current provided in the embodiment of the present application, the controller is configured to send a slip command to the battery management system, so that the battery management system outputs a driving current to drive the tire to change from a static state to a slipping state, the rotating speed sensor is used for detecting the rotating speed of the electric automobile and sending the rotating speed to the controller, the current detection circuit, used for detecting the driving current output by the battery management system and sending the detected driving current to the controller, the controller obtains the driving current at the tire slip moment according to the rotating speed, and obtains the tire pressure corresponding to the driving current at the tire slipping moment through the driving current-air pressure function, thereby realizing the intelligent detection of the tire pressure of the electric vehicle by using the current, the cost is reduced, meanwhile, the detection accuracy is improved, and a driver can timely know the air pressure of the tire.
Example two
The components and functions of the apparatus for detecting tire pressure using current are described in the above embodiments, and the detailed function implementation of the apparatus will be described in detail with reference to the accompanying drawings.
Referring to fig. 3, a block diagram of another apparatus for detecting tire pressure using current according to an embodiment of the present application is shown.
The device provided by the embodiment of the present application is applied to air pressure detection of a tire 204 of an electric vehicle, and as shown in fig. 3, the device for detecting the air pressure of the tire by using current provided by the embodiment of the present application includes a controller 202, a rotation speed sensor 203, a current detection circuit 201, a microphone module 207, and an electric quantity detection circuit 206.
The functions of the rotation speed sensor 203 and the current detection circuit 201 are the same as those described in the above embodiment, and are not described again here.
The microphone module 207 is used for obtaining sound signals of the friction between the tire and the road surface and sending the sound signals to the controller 202.
The electric quantity detection circuit 206 is used for obtaining the electric quantity used by the electric vehicle in a unit journey and sending the electric quantity used to the controller 202;
the controller 202 is not only capable of implementing the functions described in the first embodiment, but also configured to obtain, from the power consumption-air pressure function, the tire air pressure corresponding to the power consumption of the electric vehicle in the unit trip, which is sent by the power consumption detection circuit 206; and the electricity consumption-air pressure function is obtained in advance; the tire air pressure obtained with electric power and the tire air pressure obtained from the drive current are compared and verified against each other.
In practical application, the power consumption of the electric automobile is inversely proportional to the air pressure of the automobile tire, because when the air pressure of the automobile tire is lower, the friction force between the tire and the ground is larger, and the normal running of the automobile on the ground can be ensured only by consuming more electric quantity; on the contrary, when the air pressure of the automobile tire is higher, the friction force between the tire and the ground is smaller, and the normal running of the automobile on the ground can be ensured only by consuming less electric quantity.
Further, the tire pressure can be obtained according to the power consumption-air pressure function and the power consumption of the unit journey of the electric automobile, then the tire pressure value is compared with the tire pressure value obtained by utilizing the driving current, if the difference value of the tire pressure value and the tire pressure value is within a preset and allowable error range, the battery management system is normal, and meanwhile, the fact that the tire pressure is accurately detected by utilizing the power consumption can be shown.
If the difference value of the two is not within the preset and allowable error range, selecting the larger air pressure value of the two as the tire air pressure, when the tire air pressure obtained according to the power consumption-air pressure function and the power consumption is larger than the tire air pressure obtained by using the driving current, indicating that the tire air pressure obtained by using the driving current has errors, and indicating that the driving current has problems due to the one-to-one correspondence between the driving current and the tire voltage, and further obtaining that the current detection circuit and/or the rotating speed sensor for determining the driving current has faults. Correspondingly, when the tire air pressure obtained according to the power consumption-air pressure function and the power consumption is smaller than the tire air pressure obtained by using the driving current, the fact that the tire air pressure obtained by using the power consumption has errors is indicated, and due to the fact that the power consumption and the tire voltage are in one-to-one correspondence, the fact that the power consumption of a unit mileage is calculated is indicated to be in a problem, and the fact that a power consumption detection circuit for determining the power consumption has faults can be further obtained.
In some possible implementations of the present application, the power consumption-air pressure function obtained in advance by the controller is specifically:
the controller is used for respectively obtaining the power consumption of the unit strokes corresponding to the at least two air pressures, and the power consumption-air pressure function is obtained through curve fitting of the at least two air pressures and the power consumption of the unit strokes corresponding to the at least two air pressures.
In the specific implementation process, the tire pressure of the electric automobile leaving the factory and the power consumption of the unit journey of the electric automobile are tested for multiple times in advance to obtain multiple discrete test data, and curve fitting is carried out by utilizing the multiple discrete test data, so that the functional relation between the power consumption and the tire pressure is obtained. For example, the discrete test data of the used amount of electricity T and the corresponding tire air pressure P is obtained in advance as (T)0，P0)、(T1，P1) And fitting the obtained discrete test data of the power consumption T and the corresponding tire pressure P by selecting a proper curve type, and finally selecting a corresponding function as a function of the power consumption and the tire pressure according to the fitted curve type, namely, a power-air pressure function.
In some possible implementations of the present application, the controller 202 is further configured to perform a spectrum analysis on the sound signal of the friction between the tire and the road surface sent by the microphone module 207 to obtain a frequency of the sound signal, and obtain a tire pressure corresponding to the frequency of the sound signal through a frequency-pressure function; and the frequency-pressure function is obtained in advance; the tire air pressure obtained by the drive current and the tire air pressure obtained by the frequency of the sound signal are compared and verified against each other.
In practical application, the microphone module 207 may be disposed on a vehicle tire, when the battery management system outputs a driving current to drive the tire to change from a stationary state to a slipping state, the sound signal of the friction between the tire and the road surface is obtained until the tire slipping stops, and the sound signal of the friction between the tire and the road surface obtained in the above time period is sent to the controller.
The number and the installation position of the microphone modules 207 may be set according to actual requirements, and the installation position of the microphone modules 207 shown in fig. 4 is only an example and is not limited to a specific position. If only one microphone module 207 is mounted on the vehicle, it can be mounted in the middle of the frame and communicate with the controller 202; if four microphone modules are installed, the four microphone modules can be installed at the four top corners of the vehicle frame and respectively establish communication connection with the controller 202, so that the controller 202 obtains sound signals through the four microphone modules 207. Of course, there may be other numbers of microphone modules 207, and the locations of the microphone modules 207 may be reasonably arranged according to the actual number of installations.
For better understanding of the installation position of the microphone module 207, refer to fig. 4, which shows a top view of the installation position structure of the microphone module provided by the embodiment of the present application. In fig. 4, four microphone modules are respectively installed at four corners of the top of the vehicle frame and are respectively in communication connection with the controller 202, the controller 202 is installed at the middle part of the vehicle frame, the four microphone modules 207 can simultaneously operate and send the obtained sound signals to the controller 202, and the controller 202 can distinguish the sound signals sent by the four different microphone modules 207 according to the receiving time delay.
In practical application, the air pressure of the automobile tire is a function of the frequency corresponding to the sound signal, and the frequency-air pressure function is obtained through a plurality of tests in advance. When the controller analyzes the frequency corresponding to the sound signal of the current tire, the corresponding tire air pressure can be obtained through the function.
Further, the tire pressure can be obtained according to the frequency-air pressure function and the frequency of the sound signal, then the tire pressure value is compared with the tire pressure value obtained by using the driving current, if the difference value of the tire pressure value and the tire pressure value is within a preset and allowable error range, the battery management system is normal, and meanwhile, the tire pressure detection accuracy by using the frequency of the sound signal can also be shown.
If the difference value of the two is not within the preset and allowable error range, selecting the larger air pressure value of the two as the tire air pressure, when the tire air pressure obtained according to the frequency-air pressure function and the frequency of the sound signal is larger than the tire air pressure obtained by using the driving current, indicating that the tire air pressure obtained by using the driving current has errors, and indicating that the driving current has problems due to the one-to-one correspondence between the driving current and the tire voltage, and further obtaining that the current detection circuit and/or the rotating speed sensor for determining the driving current has faults. Correspondingly, when the tire air pressure obtained by the frequency-air pressure function and the frequency of the sound signal is smaller than the tire air pressure obtained by the driving current, the tire air pressure obtained by the frequency of the sound signal is indicated to be wrong, and the frequency of the sound signal is indicated to be in a problem due to the one-to-one correspondence between the frequency of the sound signal and the tire voltage, so that the fault of the microphone module for obtaining the sound signal can be further obtained.
In some possible implementations, the frequency-air pressure function obtained by the controller in advance is specifically:
the controller is used for respectively obtaining the frequencies of the sound signals corresponding to the at least two air pressures during the slipping, and obtaining a frequency-air pressure function through curve fitting according to the at least two air pressures and the frequencies of the sound signals corresponding to the at least two air pressures during the slipping.
In the concrete implementation process, the tire pressure of the electric automobile leaving the factory and the frequency of the sound signal during slipping are tested for multiple times in advance to obtain multiple discrete testsAnd performing curve fitting using the plurality of discrete test data to obtain a functional relationship between frequency and tire pressure. For example, the discrete test data of the frequency f and the corresponding tire air pressure P is obtained in advance as (f)0，P0)、(f1，P1) And the like, then a more appropriate curve type may be selected to fit the discrete test data of frequency f and corresponding tire pressure P, and finally, a corresponding function may be selected as a function of frequency and tire pressure, i.e., a frequency-air pressure function, based on the fitted curve type.
In other possible implementations of the present application, the controller 202 is further configured to perform a spectrum analysis on the sound signal of the friction between the tire and the road surface sent by the microphone module 207 to obtain a frequency of the sound signal, and obtain a tire pressure corresponding to the frequency of the sound signal through a frequency-air pressure function; the frequency-air pressure function is obtained in advance; comparing any two of the tire air pressure obtained from the electric power consumption, the tire air pressure obtained from the driving current, and the tire air pressure obtained from the frequency of the sound signal to perform mutual verification.
In practical application, the tire pressure can be obtained according to the power consumption-air pressure function and the power consumption of the unit journey of the electric automobile; the tire pressure can be obtained according to the frequency-air pressure function and the frequency of the sound signal, the tire pressure can be obtained according to the driving current-air pressure function and the driving current, any two tire pressure values in the tire pressures obtained through the three modes can be compared, and if the difference value of any two values in the three modes is within a preset and allowable error range, the fact that the tire pressure is accurately detected by using the current, the power consumption or the frequency can be shown.
If the difference value between any two values is found to be not within the preset and allowable error range, the error of the tire pressure value is indicated, if the tire pressure is obtained by using the driving current, the error of the tire pressure obtained by using the driving current is indicated, and the driving current is indicated to have a problem due to the one-to-one correspondence between the driving current and the tire voltage, so that the fault of a current detection circuit and/or a rotating speed sensor for determining the driving current can be further obtained; correspondingly, if the tire pressure is obtained by using the electricity consumption, the error of the tire pressure obtained by using the electricity consumption is shown, and the electricity consumption and the tire voltage are in one-to-one correspondence, the problem of the electricity consumption of the mileage calculation unit is shown, so that the fault of an electricity quantity detection circuit for determining the electricity consumption can be further obtained; correspondingly, if the tire air pressure is obtained by using the frequency of the sound signal during the slipping, the tire air pressure obtained by using the frequency of the sound signal is indicated to be wrong, and the frequency of the sound signal is in one-to-one correspondence with the tire voltage, the problem of the frequency of the sound signal is indicated, and the fault of the microphone module for obtaining the sound signal can be further obtained.
In some other possible implementations of the present disclosure, the microphone module is configured to obtain an acoustic signal of friction between the tire and a road surface at a tire slip moment;
the controller is further configured to, before performing a spectral analysis on the sound signal to obtain a frequency of the sound signal,
and screening sound segment signals from the moment when the controller sends a slip instruction to the battery management system to the moment when the controller sends a slip stopping instruction to the battery management system.
In practical application, because the controller sends the slip command to the battery management system, the controller can store the time of sending the slip command, and screen out the sound signal of the friction between the tire slip time and the road surface from all the received sound signals, so that the controller performs spectrum analysis on the sound segment signal to obtain the frequency corresponding to the sound segment signal, and then obtains the tire air pressure corresponding to the frequency of the sound segment signal through the frequency-air pressure function.
It can be understood that, when the sound signal of tire and road surface friction is obtained by using the microphone module, the background sound signal generated by other parts is not collected, and in order to ensure that when the controller judges the sound signal, the judged sound signal is the sound signal of tire and road surface friction, the accuracy of subsequent judgment is improved.
In some possible implementations of the present application, the microphone module is further configured to obtain a background sound signal in advance when the tire does not slip;
the controller is further configured to subtract the background sound signal from the sound signal before performing a spectrum analysis on the sound signal to obtain a frequency of the sound signal.
The background sound signal may be a sound signal generated by other parts of the vehicle, and may also be a sound signal generated by other objects related to the vehicle.
In practical application, a pre-obtained background sound signal when the tire does not slip can be stored in the controller, and before the controller performs spectrum analysis on the sound signal, the pre-stored background sound signal is subtracted from the sound signal sent by the microphone module, so that the sound signal analyzed by the controller is the sound signal when the tire slips, the influence of the background sound signal on an analysis result is avoided, and the accuracy of detecting the tire pressure is improved.
In order to ensure that the interference of the background sound signal can be removed as much as possible, in some possible implementations of the present application, the obtaining the background sound signal when the tire does not slip in advance includes:
obtaining background sound signals when the tire does not slip for multiple times in advance, and averaging the background sound signals obtained for multiple times to obtain final background sound signals;
the controller subtracts the background sound signal from the sound signal, specifically:
the controller subtracts the final background sound signal from the sound signal.
In practical application, a final background sound signal obtained in advance can be stored in the controller, before the controller performs spectrum analysis on the sound signal, the final background sound signal is subtracted from the sound signal to obtain a final sound signal, so that the controller performs spectrum analysis on the final sound signal to obtain the frequency of the final sound signal, further the tire air pressure is obtained according to a frequency-air pressure function, and the background sound signal is removed more accurately, so that the accuracy of detecting the tire air pressure is further improved.
It can be understood that, when the microphone module is used for obtaining the sound signal of the tire friction with the road surface at the tire slipping time, in order to ensure that the controller judges the sound signal, the judged sound signal is the sound signal of the tire friction with the road surface at the tire slipping time, and the accuracy of subsequent judgment is improved.
However, it should be noted that the specific method for removing the background sound signal may adopt different filtering methods to perform the removal according to the characteristics of the background sound signal. For example, if the background sound signal exhibits high frequency characteristics, the background sound signal may be filtered by a low-pass filtering method; if the background sound signal exhibits low frequency characteristics, the background sound signal may be filtered using a corresponding high-pass filtering method. Of course, the removal may also be performed by adopting other corresponding methods according to other attributes of the background sound signal, which is not limited in this embodiment.
In some possible implementations of the present application, the present embodiment may further utilize a neural network to detect the air pressure of the tire, and specifically, the controller is further configured to send the driving current to the remote server; and the remote server is used for analyzing the driving current through a neural network to obtain a change curve of the sound signal and obtaining the air pressure of the automobile tire according to the change curve.
In practical application, the driving current at the time of automobile tire slipping can be obtained for multiple times, the neural network is trained by utilizing the multiple driving currents, and the trained neural network is obtained.
Based on the above, when the controller receives the driving current sent by the current detection circuit, the driving current is sent to the remote server, the remote server inputs the driving current into the trained neural network to obtain the characteristic of the change curve of the driving current, and the trained driving current obtains the air pressure of the automobile tire according to the characteristic of the change curve.
The scheme of the embodiment can more accurately detect the voltage of the tire, realize the intelligent detection of the air pressure of the electric vehicle tire by utilizing the driving current, the intelligent detection of the air pressure of the electric vehicle tire by utilizing the power consumption and the intelligent detection of the air pressure of the electric vehicle tire by utilizing the frequency, reduce the cost, improve the detection accuracy rate and enable a driver to know the air pressure of the tire in real time.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (11)
1. An apparatus for detecting tire air pressure using electric current, applied to air pressure detection of a tire of an electric vehicle, comprising: the device comprises a current detection circuit, a rotating speed sensor and a controller;
the controller is used for sending a slip instruction to the battery management system so that the battery management system outputs a driving current to drive the tire to change from a static state to a slip state;
the rotating speed sensor is used for detecting the rotating speed of the electric vehicle tire and sending the rotating speed to the controller;
the current detection circuit is used for detecting the driving current output by the battery management system and sending the detected driving current to the controller;
the controller is further used for obtaining the driving current at the tire slipping moment according to the rotating speed, and obtaining the tire air pressure corresponding to the driving current at the tire slipping moment through a driving current-air pressure function; the driving current-air pressure function is obtained in advance; the tire slip time corresponds to a time at which the rotation speed changes from 0 to non-0.
2. The apparatus for detecting tire air pressure using electric current according to claim 1, wherein said controller, previously obtaining said driving current-air pressure function, is specifically:
the controller is used for respectively obtaining the driving currents at the tire slip moments corresponding to at least two air pressures, and the driving current-air pressure function is obtained through curve fitting of the at least two air pressures and the driving currents at the tire slip moments corresponding to the air pressures.
3. The apparatus for detecting tire air pressure using electric current according to claim 1, further comprising: an electric quantity detection circuit;
the electric quantity detection circuit is used for obtaining the electricity consumption of the electric automobile in a unit stroke and sending the electricity consumption to the controller;
the controller is used for obtaining the tire air pressure corresponding to the electricity consumption through an electricity consumption-air pressure function; the electricity consumption-air pressure function is obtained in advance; the tire air pressure obtained from the used amount of electricity and the tire air pressure obtained from the drive current are compared and verified against each other.
4. The apparatus for detecting tire air pressure using electric current according to claim 3, wherein said controller, which previously obtains said power consumption-air pressure function, is specifically:
the controller is used for respectively obtaining the power consumption of the unit strokes corresponding to the at least two air pressures, and the power consumption-air pressure function is obtained through curve fitting of the at least two air pressures and the power consumption of the unit strokes corresponding to the at least two air pressures.
5. The apparatus for detecting tire air pressure using electric current according to claim 3, further comprising: a microphone module;
the microphone module is used for acquiring a sound signal of friction between the tire and a road surface;
the controller is used for carrying out spectrum analysis on the sound signal to obtain the frequency of the sound signal, and obtaining the tire air pressure corresponding to the frequency of the sound signal through a frequency-air pressure function; the frequency-air pressure function is obtained in advance; comparing any two of the tire air pressure obtained from the electric power consumption, the tire air pressure obtained from the driving current, and the tire air pressure obtained from the frequency of the sound signal to perform mutual verification.
6. The apparatus for detecting tire air pressure using electric current according to claim 5, wherein said microphone module for obtaining an acoustic signal of friction with a road surface at a tire slip time;
the controller is further configured to, before performing a spectral analysis on the sound signal to obtain a frequency of the sound signal,
and screening out an audio fragment signal from the audio signal between the moment when the controller sends the slippage instruction to the battery management system and the moment when the controller sends the slippage stopping instruction to the battery management system.
7. The apparatus for detecting tire air pressure using electric current according to claim 5, wherein said microphone module is further configured to obtain a background sound signal in advance when said tire does not slip;
the controller is further configured to subtract the background sound signal from the sound signal before performing a spectrum analysis on the sound signal to obtain a frequency of the sound signal.
8. The apparatus for detecting tire air pressure using electric current according to claim 7, wherein said previously obtained background sound signal when said tire is not slipping is specifically:
obtaining background sound signals when the tire does not slip for multiple times in advance, and taking an average value of the background sound signals obtained for multiple times as a final background sound signal;
the controller subtracts the background sound signal from the sound signal, specifically:
the controller subtracts the final background sound signal from the sound signal.
9. The apparatus for detecting tire air pressure using electric current according to claim 1, wherein said controller sets a unique ID for said battery management system;
and the controller sends the slip instruction to the battery management system through the ID of the battery management system.
10. The apparatus for sensing tire pressure using electric current according to claim 1, wherein said controller is located in an electric vehicle or in a remote server.
11. The apparatus for sensing tire pressure using electric current according to claim 1, further comprising a remote server;
the controller is further used for sending the driving current to a remote server;
and the remote server is used for analyzing the driving current through a neural network to obtain a change curve of the current and obtaining the air pressure of the tire according to the change curve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810936027.XA CN108973544B (en) | 2018-08-16 | 2018-08-16 | Device for detecting tire pressure by using current |
| PCT/CN2019/100313 WO2020034933A1 (en) | 2018-08-16 | 2019-08-13 | Device for detecting tire pressure by using current |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810936027.XA CN108973544B (en) | 2018-08-16 | 2018-08-16 | Device for detecting tire pressure by using current |
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| CN108973544B true CN108973544B (en) | 2020-09-08 |
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Cited By (1)
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| CN108973543A (en) * | 2018-08-16 | 2018-12-11 | 杭州容大智造科技有限公司 | A kind of equipment using electricity consumption detection tire pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109017166B (en) * | 2018-08-16 | 2020-09-08 | 杭州容大智造科技有限公司 | Device for detecting tire pressure by using sound |
| CN108973544B (en) * | 2018-08-16 | 2020-09-08 | 杭州容大智造科技有限公司 | Device for detecting tire pressure by using current |
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| CN108973544A (en) | 2018-12-11 |
| WO2020034933A1 (en) | 2020-02-20 |
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