CN208035867U - tire pressure monitoring device and system - Google Patents
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Abstract
Disclose a kind of tire pressure monitoring device and system, the variable quantity that the technical solution of the utility model embodiment measures the magnetic field intensity detected in axis direction by two axial magnetic sensors at two is used as the basis for estimation of change of magnetic field strength, so as to not limited by setting angle, more accurately acquire the rotary state of tire, and the state of tire pressure monitoring device is accurately controlled based on this, power consumption is being reduced, while improving service life, is improving the performance of system for monitoring pressure in tyre.
Description
Technical Field
The utility model relates to an automotive electronics technique, concretely relates to tire pressure monitoring devices and system.
Background
The Tire Pressure Monitoring System (TPMS) refers to a device for Monitoring the Pressure of a Tire and maintaining an appropriate Pressure. The use of a tire pressure monitoring system is important to ensure the driving safety of a vehicle. In a tire pressure monitoring system, a sensor for detecting pressure is generally provided in a tire, and the detected tire pressure is transmitted to a data processing device of a vehicle to realize monitoring and prompting.
As shown in fig. 1, the tire pressure monitoring system includes a tire pressure monitoring device 1 provided in a tire and a data processing device 2 provided in a vehicle control system. Since the tire pressure monitoring device 1 needs to be powered by a battery, it is necessary to reduce the power consumption of the tire pressure monitoring device 1 as much as possible in order to avoid the need to frequently replace the battery to remove the tire. In the prior art, the tire pressure monitoring device 1 is controlled to be in a low-power-consumption dormant state when the tire is static, and the tire pressure monitoring device 1 is started when the tire rotates, so that the power consumption can be reduced, and the safety of an automobile in a motion state can be ensured.
However, if the rotation state of the tire is detected by the acceleration sensor, the acceleration sensor may be out of order due to a severe impact that the tire encounters during running, because it includes a movable element. However, the technology of detecting the rotation state of the tire by the magnetic sensor in the prior art is limited by the accuracy of the magnetic sensor and the installation direction, so that the state of the tire pressure monitoring device cannot be accurately controlled.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a tire pressure monitoring device and system to monitor the rotation state of the tire more accurately, thereby controlling the state of the tire pressure monitoring device accurately.
In a first aspect, there is provided a tire pressure monitoring device comprising:
the magnetic sensor is used for measuring a first magnetic field intensity in a first direction and a second magnetic field intensity in a second direction, and the first direction and the second direction form a preset included angle with each other; and
a controller configured to control a state of the tire pressure monitoring device according to the first magnetic-field-strength variation amount and the second magnetic-field-strength variation amount.
Preferably, the predetermined included angle is an angle equal to or greater than 30 degrees and equal to or less than 90 degrees.
Preferably, the controller is configured to acquire a parameter indicating an amount of change in magnetic field strength in the tire circumferential direction from the first amount of change in magnetic field strength and the second amount of change in magnetic field strength, and to control the state of the tire pressure monitoring device in accordance with the parameter indicating the amount of change in magnetic field strength in the tire circumferential direction.
Preferably, the parameter indicating the amount of change in magnetic field strength in the tire circumferential direction is the sum of absolute values of the first amount of change in magnetic field strength and the second amount of change in magnetic field strength; or,
the parameter representing the magnetic field intensity variation in the tire circumferential direction is the sum of squares of the first magnetic field intensity variation and the second magnetic field intensity variation.
Preferably, the controller is configured to control the tire pressure monitoring device to switch to an operating state when the sum of the absolute values or the sum of squares is greater than a threshold value, and to control the tire pressure monitoring device to switch to a sleep state when the sum of the absolute values or the sum of squares is less than the threshold value over a determination period.
Preferably, the tire pressure monitoring device further includes:
a plurality of parameter sensors for collecting tire parameter information; and
a communication means for transmitting the tire parameter information;
wherein the controller is configured to control the communication means to transmit the tire parameter information at a first cycle in an operating state, and to control the communication means to transmit the tire parameter information at a second cycle in a sleep state; the first period is less than the second period.
Preferably, the controller is further configured to control the parameter sensor to acquire the tire parameter information according to a third period in an operating state, and control the parameter sensor to acquire the tire parameter information according to a fourth period in a dormant state; the third period is less than the fourth period.
Preferably, the controller is configured to control the communication means to transmit the tire parameter information when any one of the tire parameter information is detected as abnormal.
Preferably, the first direction and the second direction are any two directions located on a tangential plane of the tire circumferential surface at a predetermined angle to each other.
Preferably, the magnetic sensor is a two-axis anisotropic magnetoresistive magnetic sensor.
In a second aspect, there is provided a tire pressure monitoring system for monitoring a tire condition, the system comprising:
the tire pressure monitoring device according to the first aspect, which is mounted on a circumferential surface of a corresponding tire at random angles such that a first direction and a second direction detected by a magnetic sensor of the tire pressure monitoring device are located on a tangential plane of the circumferential surface; and
and the data processing device is in communication connection with the tire pressure monitoring device.
The utility model discloses technical scheme comes as the judgement foundation that magnetic field intensity changes through the variation of the magnetic field intensity of diaxon magnetic sensor detection in two measuring spindle directions to can not receive installation angle's restriction, acquire the rotation state of tire comparatively accurately, and based on this accurate control tire pressure monitoring devices's state, reduce the consumption, when improving life, improve tire pressure monitoring system's performance.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a prior art tire pressure monitoring system;
FIG. 2 is a block diagram of a tire pressure monitoring system in accordance with an embodiment of the present invention;
fig. 3 is a schematic view of the installation of the tire pressure monitoring device according to the embodiment of the present invention;
FIG. 4 is a schematic view of the tire rotation direction of an embodiment of the present invention;
fig. 5 is a schematic view of the magnetic field detection direction of the tire pressure monitoring apparatus according to the embodiment of the present invention;
fig. 6 is an operation waveform diagram of the tire pressure monitoring device according to the embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 2 is a block diagram of a tire pressure monitoring system according to an embodiment of the present invention. As shown in fig. 2, the tire pressure monitoring system of the present embodiment includes at least one tire pressure monitoring device 3 and a data processing device 4. Each tire pressure monitoring device 3 is mounted in a corresponding tire. Preferably, the tire pressure monitoring device 3 is mounted on the hub peripheral surface of the tire (as shown in fig. 3), whereby it can be stably fixed and in good contact with the inflated portion of the tire to detect the parameter information of the portion. The data processing device 4 is in communication connection with each tire pressure monitoring device 3, so that the uploaded pressure information and other tire parameter information (e.g., temperature, battery voltage, etc.) can be received from the tire pressure monitoring devices 3, and can be further processed and then presented to the driver through the human-machine interface.
The tire pressure monitoring device 3 of the present embodiment includes a magnetic sensor 31 and a controller 32, and may further include a plurality of parameter sensors for detecting tire parameters, such as a pressure sensor 33 and a temperature sensor 34, as well as a communication unit 35 and a power management circuit 36. The magnetic sensor 31, the pressure sensor 33, and the temperature sensor 34 are connected to the controller 32 via independent signal lines or a common signal bus. The controller 32 may be implemented in various manners, such as an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and a single chip microcomputer. The communication component 35 may include a wireless communication component.
The magnetic sensor 31, which may be referred to as a magnetometer, may be configured as a coil with a magnetic core disposed in a particular direction that generates a signal proportional to the amount of magnetic flux passing therethrough according to lenz's law. The greater and faster the change in magnetic flux through the coil, the greater the signal produced. Alternatively, the magnetic sensor may be made of anisotropic hysteresis (AMR) material, the Resistance of which changes with the change of the induced magnetic field. The earth's magnetic field is like a bar magnet with magnetic south poles pointing towards magnetic north poles. The magnetic field is perpendicular to the local horizontal plane at the magnetic pole point and parallel to the local horizontal plane at the equator, so that the magnetic field is obliquely directed to the ground in the northern hemisphere direction. The earth magnetic field is a vector that can be decomposed into two components parallel to the local horizontal plane and one component perpendicular to the local horizontal plane for a fixed location. The magnetic sensor is simultaneously in the geomagnetic field and the environmental magnetic field formed by the electronic circuit of the automobile, ferromagnet and the like. When the magnetic sensor 31 rotates with the tire to different positions (as shown in fig. 4), its relative orientation to the external magnetic field is different, so that the magnetic field strength measured in a specific direction is also changed accordingly, which is detected by the magnetic sensor, thereby generating a changed magnetic field strength measurement. By detecting the change of the magnetic field intensity, whether the tire rotates or not can be sensed.
However, in the related art, since the hall magnetic sensor has a poor accuracy of about 0.5mV/V/G, and when a voltage of 1V is applied to the hall magnetic sensor, the magnetic variation at 180 degrees rotation is about 0.35 gauss per gauss variation of 0.05mV, and the noise value of a general circuit is close to this variation, the tire pressure monitoring apparatus using the hall magnetic sensor cannot detect a sufficient variation in magnetic field induction intensity due to the rotation of the tire during the running of the vehicle, and thus cannot switch the operating state of the tire pressure monitoring apparatus in time. In the process of tire rotation, the variation of the magnetic field intensity component in the radial direction of the tire and the variation of the magnetic field intensity component in the circumferential direction of the tire are large, and the magnetic field intensity in the axial direction of the tire basically does not change. Meanwhile, because it is desirable to design the tire pressure monitoring device as flat as possible, some sensors with higher accuracy, such as Z-axis AMR magnetic sensors, have a larger dimension in the direction of the measuring axis, and because of their special manufacturing process, it is necessary to fabricate a trench with a depth of hundreds of micrometers and a certain angle on a silicon wafer, or to erect the silicon wafer during packaging, the magnetic sensor formed by this manufacturing process will have reliability problems due to the high-speed rotation of the tire, and therefore, it is not suitable for being disposed in the tire to measure the radial magnetic field change. Thus, a single axis planar magnetic sensor, with a sensitivity of about 0.5mV/V/G, is often arranged with the measurement axis aligned with the circumferential and axial directions, respectively. However, this arrangement makes it possible to determine whether the tire is rotating only by relying mainly on the change in the magnetic field strength measured in the circumferential direction. Further, due to the difference in the mounting process of the tire pressure monitoring device, it cannot be guaranteed that the measuring shaft of the magnetic sensor is accurately aligned in the circumferential direction and the axial direction after the mounting is completed. In particular, a tire pressure monitoring device which is partially external and is fixed on an inflating nozzle of a tire by screws needs to be rotated to a completely airtight position, and the final pointing direction of the tire pressure monitoring device has certain randomness. The control device 32 cannot adjust the difference in the magnetic field variation amplitude due to the randomness after the completion of the mounting, and therefore, the rotation state of the tire cannot be normally detected, and the operating state cannot be normally switched.
In a preferred embodiment of the present embodiment, the magnetic sensor 31 is a two-axis planar sensor that can measure the magnetic field strengths B1 and B2 in two directions (the first direction X and the second direction Y) perpendicular to each other plane. Wherein the first direction X and the second direction Y are located on a tangential plane to the tyre circumferential plane. As shown in fig. 5, when the tire pressure monitoring device is mounted on the tire in such a manner that there is some randomness, the first direction X and the second direction Y of the measurement axis of the magnetic sensor 31 may be directed to any direction of the tangential plane. In fig. 3, the first direction X makes an angle a with the circumferential direction Y '(the direction of rotation of the tire), and the second direction Y makes an angle 90-a with the circumferential direction Y'. Thus, the change in the magnetic field strength in the tire rotational direction can be represented By the sum of the projection value of the amount of change in the magnetic field strength measured in the first direction X in the circumferential direction Y ' and the projection value of the amount of change in the magnetic field strength measured in the second direction Y in the circumferential direction Y ', that is, By ' ═ B1 × cosa + B2 × cos (90-a). Considering the magnetic field strength Bx' in the axial direction, the magnetic field strength B1 detected by the magnetic sensor 31 in the first direction X can be expressed as:
B1＝By’*cosa+Bx’*sina
the magnetic field strength B2 detected by the magnetic sensor 31 in the second direction Y can be expressed as:
B2＝By’*sina-Bx’*cosa
when the tire rotates, By ' changes and increases By ' while the magnetic field intensity Bx ' in the axial direction remains substantially unchanged, the magnetic field intensities B1 and B2 detected By the magnetic sensor 31 satisfy:
B1＝(By’+ΔBy’)*cosa+Bx’*sina
B2＝(By’+ΔBy’)*sina-Bx’*cosa
the variation of both can be expressed as:
ΔB1＝ΔBy’*cosa
ΔB2＝ΔBy’*sina
thus, the amount of change in the magnetic field strength in the circumferential direction can be obtained by the amount of change in the magnetic field strengths B1 and B2, or can be approximated. In the present embodiment, the controller 32 is configured to control the state of the tire pressure monitoring apparatus in accordance with the variation Δ B1 of the magnetic field strength B1 and the variation Δ B2 of the magnetic field strength B2. Therefore, no matter how the installation angle changes, a relatively accurate representation value of the circumferential magnetic field change can be obtained, the working state detection of the tire pressure monitoring device is not influenced by the installation angle, and high accuracy is kept.
Specifically, the controller 32 acquires a parameter indicating the amount of change in the magnetic field strength in the circumferential direction from the amount of change Δ B1 in the magnetic field strength B1 and the amount of change Δ B2 in the magnetic field strength B2, and controls the state of the tire pressure monitoring device based on the parameter indicating the amount of change in the magnetic field strength in the circumferential direction.
In an alternative implementation, since | sina | + | cosa | is a number having a minimum value of 1 and a maximum value of not more than 1.5, the sum of the absolute values of the magnetic-field-strength variations Δ B1 and Δ B2 is used as a parameter approximately representing the variation of the magnetic-field strength By'. Since the error does not exceed 0.5 regardless of the change in the angle a, since the difference between the maximum value and the minimum value of the magnetic field strength during one rotation of the tire is greater than 50%, the rotation of the tire can be effectively detected by the sum of the absolute values of the magnetic field strength changes Δ B1 and Δ B2. Although the variation of the magnetic field intensity is approximately characterized by adopting the summing mode, a certain accuracy is lost, and the summing calculation consumes less calculation resources, so that a controller with lower cost can be adopted, and the real-time performance of the tire rotation state monitoring is better.
In another alternative implementation, the result is (sina)2+(cosa)21. Therefore, the sum of squares of the magnetic-field-strength variations Δ B1 and Δ B2 is used to accurately characterize the variation in the magnetic-field strength By'. Therefore, the magnetic field change can be detected more accurately, the tire rotation state can be detected more accurately, and the negative influence of the installation angle on the detection is completely eliminated.
It will be appreciated that, in addition to the above-described implementations, the circumferential field strength variations may be characterized using, for example, a weighted sum, a sum of squares, and an evolution of the field strength variations Δ B1 and Δ B2, or other means.
Alternatively, the pointing directions (the first direction and the second direction) of the two measurement axes of the magnetic sensor 31 are not necessarily perpendicular, and it is possible to obtain a parameter representing the amount of change in the magnetic field strength in the tire circumferential direction by the amount of change in the magnetic field strength in the two directions, as long as the parameter is a fixed predetermined angle. Therefore, in other embodiments, the measurement axes of the magnetic sensor 31 are at a predetermined angle different from zero with respect to each other. Preferably, the predetermined angle is an angle of 30 degrees or more and 90 degrees or less.
Specifically, the controller 32 controls the tire pressure monitoring device to switch to the operating state when the sum of the absolute values or the sum of squares is greater than a threshold value, and controls the tire pressure monitoring device to switch to the sleep state when the sum of the absolute values or the sum of squares is less than the threshold value over a determination period. In the operating state, the controller 32 controls the communication component 35 to report the tire parameter information to the data processing device 4 every short first period (for example, 3 minutes) to ensure continuous monitoring of the tire condition and safety of the vehicle running. In the sleep state, the controller 33 controls the reporting period of the communication unit 35 to be extended, and reports the tire parameter information to the data processing device 4 at a second longer period (for example, 30 minutes), so as to reduce the number of reports, reduce the power consumption of the tire pressure monitoring device, and improve the service life. Therefore, the controller 32 can accurately start or sleep the tire pressure monitoring device according to the magnetic field intensity variation in two directions detected by the two-axis magnetic sensor 31, and the working performance is improved on the premise of not influencing the power consumption.
Further, the controller 32 further reduces the power consumption in the sleep state by adjusting the detection period of each parameter sensor in different states. The controller 32 may be configured to control the parameter sensor to collect tire parameter information at a third, shorter period (e.g., 5 seconds) during the operating state and at a fourth, longer period (e.g., 10 seconds) during the sleep state.
Of course, the controller 32 may also report the tire parameter information directly in real time at the time when the tire pressure or other parameter abnormality is found, and report the abnormality information in real time.
Fig. 6 is a diagram of a magnetic field intensity waveform obtained by simulation in the case where the measurement axis of the magnetic sensor 31 is at 45 degrees to the tire circumferential direction. As shown in fig. 6, until time t1, the tire is at rest and both magnetic field strengths B1 and B2 are maintained at about a constant value. Meanwhile, the sum Δ B of the absolute values of the amounts of change in the magnetic field strengths B1 and B2 is lower than a predetermined threshold value. Between time t1 and time t2, the tire continues to rotate. The magnetic field strengths B1 and B2 exhibit a periodic fluctuation. As mentioned above, since the magnetic field in the axial direction is substantially constant, the changing trends of the magnetic field strengths B1 and B2 are substantially the same. The sum Δ B of the absolute values of the amounts of change corresponding to the magnetic field strengths B1 and B2 also changes with the change in the magnetic field strength. After time t2, the tire returns to a standstill, and the magnetic field strengths B1 and B2 are constant around a new constant value (determined for the position of the tire). At the same time, the sum Δ B of the absolute values of the changes in the magnetic field strengths B1 and B2 also returns below a predetermined threshold. Therefore, the sum value and the threshold value are compared to judge whether the tire rotates or not more accurately, and further judge whether the state of the tire pressure monitoring device is switched or not.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (11)
1. A tire pressure monitoring device comprising:
the magnetic sensor is used for measuring a first magnetic field intensity in a first direction and a second magnetic field intensity in a second direction, and the first direction and the second direction form a preset included angle with each other; and
a controller configured to control a state of the tire pressure monitoring device according to the first magnetic-field-strength variation amount and the second magnetic-field-strength variation amount.
2. The tire pressure monitoring device according to claim 1, wherein the predetermined angle is an angle of 30 degrees or more and 90 degrees or less.
3. The tire pressure monitoring device according to claim 1, wherein the controller is configured to acquire a parameter indicating an amount of change in magnetic field strength in the tire circumferential direction from the first amount of change in magnetic field strength and the second amount of change in magnetic field strength, and to control the state of the tire pressure monitoring device according to the parameter indicating the amount of change in magnetic field strength in the tire circumferential direction.
4. A tire pressure monitoring device according to claim 3, wherein said parameter indicative of the amount of change in magnetic field strength in the circumferential direction of the tire is the sum of the absolute values of said first amount of change in magnetic field strength and said second amount of change in magnetic field strength; or
The parameter representing the magnetic field intensity variation in the tire circumferential direction is the sum of squares of the first magnetic field intensity variation and the second magnetic field intensity variation.
5. The tire pressure monitoring device according to claim 3, wherein the controller is configured to control the tire pressure monitoring device to switch to an operating state when the sum of the absolute values or the sum of squares is greater than a threshold value, and to control the tire pressure monitoring device to switch to a sleep state when the sum of the absolute values or the sum of squares has an average value in a determination period that is less than the threshold value.
6. The tire pressure monitoring device according to claim 5, further comprising:
a plurality of parameter sensors for collecting tire parameter information; and
a communication means for transmitting the tire parameter information;
wherein the controller is configured to control the communication means to transmit the tire parameter information at a first cycle in an operating state, and to control the communication means to transmit the tire parameter information at a second cycle in a sleep state; the first period is less than the second period.
7. The tire pressure monitoring device of claim 6, wherein the controller is further configured to control the parameter sensor to collect tire parameter information for a third period in an operating state and to control the parameter sensor to collect tire parameter information for a fourth period in a resting state; the third period is less than the fourth period.
8. The tire pressure monitoring device according to claim 7, wherein the controller is configured to control the communication component to transmit the tire parameter information when any abnormality of the tire parameter information is detected.
9. The tire pressure monitoring device according to claim 1, wherein the first direction and the second direction are any two directions lying on a tangential plane of the tire circumferential surface at a predetermined angle.
10. The tire pressure monitoring device of claim 1, wherein the magnetic sensor is a two-axis anisotropic magnetoresistive magnetic sensor.
11. A tire pressure monitoring system for monitoring a tire condition, the system comprising:
the tire pressure monitoring device according to any one of claims 1 to 10, which is mounted on a circumferential surface of a corresponding tire at a random angle such that a first direction and a second direction detected by a magnetic sensor of the tire pressure monitoring device are located on a tangential plane of the circumferential surface; and
and the data processing device is in communication connection with the tire pressure monitoring device.
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| CN201820440442.1U CN208035867U (en) | 2018-03-29 | 2018-03-29 | tire pressure monitoring device and system |
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| CN201820440442.1U CN208035867U (en) | 2018-03-29 | 2018-03-29 | tire pressure monitoring device and system |
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