CN117162712A - Failure strategy control method based on failure of direct tire pressure monitoring sensor - Google Patents
Failure strategy control method based on failure of direct tire pressure monitoring sensor Download PDFInfo
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- CN117162712A CN117162712A CN202311162357.5A CN202311162357A CN117162712A CN 117162712 A CN117162712 A CN 117162712A CN 202311162357 A CN202311162357 A CN 202311162357A CN 117162712 A CN117162712 A CN 117162712A
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Abstract
The invention discloses a failure strategy control method based on failure of a direct tire pressure monitoring sensor, which comprises the following steps: step S101, a CAN signal and a LIN signal of a vehicle are obtained through a vehicle OBD interface; step S102, reading a wheel speed pulse signal and a tire pressure signal from a CAN signal and a LIN signal of a vehicle; and step 103, judging whether the direct tire pressure monitoring sensor fails according to the wheel speed pulse signals and the tire pressure signals, and if the direct tire pressure monitoring sensor fails, adopting a failure strategy to monitor the tire pressure. The invention provides a failure strategy control method based on the failure of a direct tire pressure monitoring sensor, which can flexibly select the most matched strategy for tire pressure monitoring according to the failure condition of the direct tire pressure monitoring sensor.
Description
Technical Field
The invention relates to a failure strategy control method based on failure of a direct tire pressure monitoring sensor.
Background
At present, with the continuous development of the automobile industry in China and the increase of automobile stock, the safety performance of automobiles is also receiving more and more attention. During running of the car, the faults related to the tires are the most difficult to prevent, which is also an important cause of occurrence of sudden traffic accidents. In the field of safety related to tires, a burst can have irreparable serious consequences, and most burst has a direct relationship with insufficient tire pressure. It is counted that 70% of traffic accidents on the expressway in china are caused by tire burst, and this proportion is as high as 80% in the united states. When the tire pressure is insufficient, the side surface of the tire is extruded and bent to raise the temperature, the impact resistance is reduced, and the probability of tire burst is greatly increased. How to prevent tire burst has become an important subject of safe driving, and according to the analysis of related articles of the national rubber tire quality supervision center, maintaining standard tire pressure and timely finding out a flat tire during running are key to preventing tire burst. While the Tire Pressure Monitoring System (TPMS) of an automobile is certainly an ideal tool.
As automobile electronics technology is rapidly developed, automobile tire pressure detection systems, which detect the pressure of the four-wheel tires of an automobile in real time, are increasingly demanded today as basic configurations for ensuring running safety, but if tire pressure sensors are provided on each tire, cost increases and benefit is affected, so that a detection system capable of detecting the tire pressure and having lower production cost is now required.
Currently, a common tire pressure monitoring system obtains the tire pressure by installing a sensor with a wireless transmitting function in the tire, which is called a direct type tire pressure monitoring system, and is divided into an external type and an internal type, and part of the direct type tire pressure monitoring system also supports obtaining the temperature information inside the tire. However, the existing direct tire pressure monitoring sensor has the defect of failure to cause the failure to work normally, and the failure mode of the direct tire pressure monitoring sensor mainly comprises the following steps: failure of self-positioning, hardware failure and display or alarm misplacement. With a purely direct tire pressure monitoring system, however, a pressure sensor needs to be provided in each tire, which can result in excessive costs.
Therefore, it is necessary to design a method and a system thereof which are low in cost, good in monitoring effect, suitable for various vehicle types, and capable of stably coping with tire pressure sensor failure.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art, and provides a failure strategy control method based on the failure of a direct tire pressure monitoring sensor, which can flexibly select the most matched strategy for tire pressure monitoring according to the failure condition of the direct tire pressure monitoring sensor.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a failure strategy control method based on the failure of a direct tire pressure monitoring sensor comprises the following steps:
step S101, a CAN signal and a LIN signal of a vehicle are obtained through a vehicle OBD interface;
step S102, reading a wheel speed pulse signal and a tire pressure signal from a CAN signal and a LIN signal of a vehicle;
and step 103, judging whether the direct tire pressure monitoring sensor fails according to the wheel speed pulse signals and the tire pressure signals, and if the direct tire pressure monitoring sensor fails, adopting a failure strategy to monitor the tire pressure.
Further, the case where the direct tire pressure monitoring sensor fails in step S103 includes:
the direct tire pressure monitoring sensor fails to self-locate;
the direct tire pressure monitoring sensor displays or alarms to be misplaced;
hardware failure of the direct tire pressure monitoring sensor of a single tire;
the direct tire pressure monitoring sensors of two tires have hardware faults at the same time;
the direct tire pressure monitoring sensors of three tires have hardware faults at the same time;
the direct tire pressure monitoring sensors of four tires simultaneously fail in hardware.
Further, the hardware failure includes a low power and the signal is masked.
Further, the failure policy of step S103 includes:
and if the direct tire pressure monitoring sensor fails to perform self-positioning, the direct tire pressure monitoring sensor signal is subjected to self-positioning again.
Further, the failure policy of step S103 includes:
if the direct tire pressure monitoring sensor displays or alarms to be misplaced, the wheel speed comparison method is adopted to monitor the tire pressure.
Further, the failure policy of step S103 includes:
if the direct tire pressure monitoring sensor of a single tire has hardware faults or the direct tire pressure monitoring sensors of two tires have hardware faults at the same time or the direct tire pressure monitoring sensors of three tires have hardware faults at the same time, adopting a wheel speed comparison method to monitor the tire pressure of the tires.
Further, the failure policy of step S103 includes:
if the direct tire pressure monitoring sensors of the four tires have hardware faults at the same time, the natural frequency comparison method is adopted to monitor the tire pressure of the tires.
Further, the direct tire pressure monitoring sensor signal is repositioned, and the method specifically comprises the following steps:
acquiring a LIN signal and a CAN signal of a vehicle;
the position of a gear ring in a wheel speed signal in the CAN signal corresponding to the time stamp is obtained according to the tire pressure LIN signal push-back time stamp; obtaining a wheel speed pulse according to a wheel speed CAN signal, and obtaining the position of a gear ring in the wheel speed signal corresponding to the wheel speed pulse;
calculating to obtain the coordinates of all the corresponding gear ring positions, and calculating the distance from the coordinates of the mean position to the origin according to the coordinates of the mean position;
if the distance from the coordinate of the mean position to the origin is the smallest, the positioning is successful.
By adopting the technical scheme, the invention integrates the CAN data signal and the LIN data signal, and selects different failure strategies for tire pressure monitoring aiming at various failure conditions of the direct tire pressure monitoring sensor. The updating frequency of the tire pressure monitoring sensor is reduced and the service life of the sensor battery is prolonged by a wheel speed comparison method. And correcting the position of the corresponding tire when alarming by utilizing a wheel speed comparison strategy. The method integrates the wheel speed method and the tire pressure signal which can normally work to estimate the tire pressure of the lost position, and realizes the intellectualization and systemization of the TPMS system. The natural frequency comparison method obtains four-wheel speed signals through CAN communication, and judges whether the tire pressure is normal or not through the frequency method and the wheel speed method. According to the invention, the most matched strategy can be flexibly selected for tire pressure monitoring according to the failure condition of the direct tire pressure monitoring sensor, and the monitoring effect is more accurate and stable.
Drawings
FIG. 1 is a flow chart of a failure strategy control when a direct tire pressure monitoring sensor of the present invention fails;
FIG. 2 is a logic diagram of the direct tire pressure monitoring failure handling strategy of the present invention;
FIG. 3 is a flow chart of the direct tire pressure monitoring sensor relocation according to the present invention;
FIG. 4 is a left front gear tooth bitmap in sensor repositioning of the present invention;
FIG. 5 is a bitmap of the front right tooth in sensor repositioning of the present invention;
FIG. 6 is a left rear gear tooth bitmap in sensor repositioning of the present invention;
FIG. 7 is a right rear gear tooth bitmap in sensor repositioning of the present invention.
Detailed Description
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, the present embodiment provides a failure policy control method based on the failure of a direct tire pressure monitoring sensor, which includes:
step S101, a CAN signal and a LIN signal of a vehicle are obtained through a vehicle OBD interface;
step S102, reading a wheel speed pulse signal and a tire pressure signal from a CAN signal and a LIN signal of a vehicle;
and step 103, judging whether the direct tire pressure monitoring sensor fails according to the wheel speed pulse signals and the tire pressure signals, and if the direct tire pressure monitoring sensor fails, adopting a failure strategy to monitor the tire pressure.
As shown in fig. 2, the case where the direct tire pressure monitoring sensor fails in step S103 of the present embodiment includes:
the direct tire pressure monitoring sensor fails to self-locate;
the direct tire pressure monitoring sensor displays or alarms to be misplaced;
the direct tire pressure monitoring sensor of the single tire has hardware faults;
the direct tire pressure monitoring sensors of two tires have hardware faults at the same time;
the direct tire pressure monitoring sensors of three tires have hardware faults at the same time;
the direct tire pressure monitoring sensors of the four tires have hardware faults at the same time;
the hardware faults include low power and signal shielding of the direct tire pressure monitoring sensor.
As shown in fig. 2, the failure policy of step S103 of the present embodiment is divided into the following cases:
1. if the direct tire pressure monitoring sensor fails in self-positioning, the signal of the direct tire pressure monitoring sensor is subjected to self-positioning again.
2. If the direct tire pressure monitoring sensor displays or alarms with dislocation, the tire pressure monitoring is carried out by adopting a wheel speed comparison method, the position of the corresponding tire is corrected when the alarm is given by utilizing a wheel speed comparison strategy, and the national standard alarm requirement is met.
3. If the direct tire pressure monitoring sensor of a single tire has hardware faults or the direct tire pressure monitoring sensors of two tires have hardware faults at the same time or the direct tire pressure monitoring sensors of three tires have hardware faults at the same time, adopting a wheel speed comparison method to monitor the tire pressure of the tires.
4. If the direct tyre pressure monitoring sensors of four tyres have hardware faults at the same time, adopting a natural frequency comparison method to monitor the tyre pressure.
The wheel speed comparison method is to obtain four-wheel speed signals through CAN communication, estimate the tire pressure at the lost position by utilizing the wheel speed method and the tire pressure signals which CAN normally work, and support national standard alarm. The natural frequency comparison method is to obtain four-wheel speed signals through CAN communication, judge whether the tire pressure is normal or not through a frequency method and a wheel speed method, and support national standard alarm.
As shown in fig. 3 to 7, the method for repositioning the direct tire pressure monitoring sensor signal of the present embodiment specifically includes the following steps:
acquiring a LIN signal and a CAN signal of a vehicle;
the position of a gear ring in a wheel speed signal in the CAN signal corresponding to the time stamp is obtained according to the tire pressure LIN signal push-back time stamp; obtaining a wheel speed pulse according to a wheel speed CAN signal, and obtaining the position of a gear ring in the wheel speed signal corresponding to the wheel speed pulse;
calculating to obtain the coordinates of all the corresponding gear ring positions, and calculating the distance from the coordinates of the mean position to the origin according to the coordinates of the mean position;
the direct tire pressure is relative to a wheel speed signal in the CAN signal, the corresponding gear ring position is relatively concentrated, and the coordinate of the obtained mean value position is far from the origin; therefore, if the distance from the coordinate of the mean position to the origin is the smallest, the positioning is successful; if the distance from the coordinate of the mean position to the origin is the maximum, the wheel is a non-corresponding wheel.
The technical problems, technical solutions and advantageous effects solved by the present invention have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of protection of the present invention.
Claims (8)
1. The failure strategy control method based on the failure of the direct tire pressure monitoring sensor is characterized by comprising the following steps:
step S101, a CAN signal and a LIN signal of a vehicle are obtained through a vehicle OBD interface;
step S102, reading a wheel speed pulse signal and a tire pressure signal from a CAN signal and a LIN signal of a vehicle;
and step 103, judging whether the direct tire pressure monitoring sensor fails according to the wheel speed pulse signals and the tire pressure signals, and if the direct tire pressure monitoring sensor fails, adopting a failure strategy to monitor the tire pressure.
2. The method according to claim 1, wherein the failure policy control method based on the failure of the direct tire pressure monitoring sensor in step S103 includes:
the direct tire pressure monitoring sensor fails to self-locate;
the direct tire pressure monitoring sensor displays or alarms to be misplaced;
hardware failure of the direct tire pressure monitoring sensor of a single tire;
the direct tire pressure monitoring sensors of two tires have hardware faults at the same time;
the direct tire pressure monitoring sensors of three tires have hardware faults at the same time;
the direct tire pressure monitoring sensors of four tires simultaneously fail in hardware.
3. The failure policy control method based on the failure of the direct tire pressure monitoring sensor according to claim 2, wherein: the hardware failure includes a low power and the signal being masked.
4. The method according to claim 2, wherein the failure policy control method in step S103 includes:
and if the direct tire pressure monitoring sensor fails to perform self-positioning, the direct tire pressure monitoring sensor signal is subjected to self-positioning again.
5. The method according to claim 2, wherein the failure policy control method in step S103 includes:
if the direct tire pressure monitoring sensor displays or alarms to be misplaced, the wheel speed comparison method is adopted to monitor the tire pressure.
6. The method according to claim 2, wherein the failure policy control method in step S103 includes:
if the direct tire pressure monitoring sensor of a single tire has hardware faults or the direct tire pressure monitoring sensors of two tires have hardware faults at the same time or the direct tire pressure monitoring sensors of three tires have hardware faults at the same time, adopting a wheel speed comparison method to monitor the tire pressure of the tires.
7. The method according to claim 2, wherein the failure policy control method in step S103 includes:
if the direct tire pressure monitoring sensors of the four tires have hardware faults at the same time, the natural frequency comparison method is adopted to monitor the tire pressure of the tires.
8. The method for controlling the failure strategy when the direct tire pressure monitoring sensor fails according to claim 4, wherein the method comprises the following steps: the direct tire pressure monitoring sensor signal is repositioned by self, and specifically comprises the following steps:
acquiring a LIN signal and a CAN signal of a vehicle;
the position of a gear ring in a wheel speed signal in the CAN signal corresponding to the time stamp is obtained according to the tire pressure LIN signal push-back time stamp; obtaining a wheel speed pulse according to a wheel speed CAN signal, and obtaining the position of a gear ring in the wheel speed signal corresponding to the wheel speed pulse;
calculating to obtain the coordinates of all the corresponding gear ring positions, and calculating the distance from the coordinates of the mean position to the origin according to the coordinates of the mean position;
if the distance from the coordinate of the mean position to the origin is the smallest, the positioning is successful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311162357.5A CN117162712A (en) | 2023-09-09 | 2023-09-09 | Failure strategy control method based on failure of direct tire pressure monitoring sensor |
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| CN202311162357.5A CN117162712A (en) | 2023-09-09 | 2023-09-09 | Failure strategy control method based on failure of direct tire pressure monitoring sensor |
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