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Tire pressure monitoring and early warning system and method based on absolute comparison method of wheel pulse numbers

A wheel pulse and tire pressure monitoring technology, which is applied in tire measurement, tire parts, vehicle parts, etc., can solve the problem of sensor being affected by vibration, high temperature, high pressure and centrifugal force, as well as wireless transmission of data, etc. Problems such as complex process, to achieve the effect of shortening the tire pressure discrimination time, reducing the misjudgment rate and missed judgment rate, and high reliability

Active Publication Date: 2019-04-26
清华大学苏州汽车研究院(吴江) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are two main types of tire pressure monitoring systems: direct type and indirect type: the direct type is to install a pressure sensor in the tire or on the valve to directly measure the tire pressure, and the measured tire pressure data is sent to the receiver through wireless means. It is displayed on the monitor, or displayed through sound, light, etc. It has the characteristics of fast response, high sensitivity, and real-time display of tire pressure. However, the installation process is complicated and the cost is high, and the sensor is subject to vibration, high temperature, and high pressure. Influenced by centrifugal force and wireless data transmission, etc., the reliability of the work is reduced. In addition, there is still no good solution for dealing with scrap batteries. For this reason, the research of indirect TPMS has been highly valued.

Method used

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  • Tire pressure monitoring and early warning system and method based on absolute comparison method of wheel pulse numbers
  • Tire pressure monitoring and early warning system and method based on absolute comparison method of wheel pulse numbers
  • Tire pressure monitoring and early warning system and method based on absolute comparison method of wheel pulse numbers

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Effect test

Embodiment

[0041]The tire pressure monitoring and early warning system of the present invention includes wheel speed sensors installed on the four wheels of the vehicle, a wheel pulse number receiving and processing unit that receives and processes the pulse signals output by the wheel speed sensors, and stores the pulse signals in the wheel pulse number calculation and judging unit , the operation discrimination unit can provide a certain amount of information storage function and can carry out the algorithm operation of corresponding rules to judge whether the tire pressure is abnormal, and output the judgment result information to the tire pressure information display unit or the designated information receiver, such as: CAN system or display screen etc.

[0042] A certain type of vehicle with standard tire pressure P 0 and a certain steady speed V 0 Travel a certain distance S 0 , record the standard pulse number of each wheel Respectively: the left front wheel is Right front w...

example 1

[0048] Since the rolling distance of the wheels is equal, according to the relationship between the vehicle speed and the rolling radius of the wheel: r=k v (v-v 0 )+r 0 And the relationship between tire pressure and wheel rolling radius: r=k p (p-p 0 )+r 0 , and the relationship between the wheel radius r, the pulse number N and the rolling distance S: r=ZS / (2πN), the corrected pulse number N of the No. 1 wheel can be deduced 1 Corresponding standard pulse number The difference Δ 1 for:

[0049]

[0050] In formula (1): k v is the variation coefficient of vehicle speed and wheel radius, k p is the variation coefficient of tire pressure and wheel radius; k 0 =N 0 / (2r 0 ), the rolling radius of the wheel in the standard state is r 0 , the rolling distance is S 0 The corresponding average number of pulses is N 0 ;

[0051] In formula (1): the number of pulses of the No. 1 wheel in the tth monitoring period due to the change of vehicle speed The amount of ch...

example 2

[0096] Use the fitting method to solve; Substitute (6)(7)(8) into (13), in the obtained common correction value ΔN expression of each wheel pulse number, it can be considered coefficients with different constants, so that:

[0097]

[0098] In (23), α 0 , α 1 , α 2 , α 3 , α 4 is a constant, according to (23) choose 5 different real conditions, carry out the corresponding test, according to the test data, the corresponding coefficient can be obtained, and the common correction value of the pulse number of each wheel can be obtained by fitting.

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Abstract

The invention discloses a tire pressure monitoring and early warning system based on a wheel pulse number absolute comparison method. The system comprises a wheel rotation pulse number monitoring unit used for generating and receiving rotation pulse number information of each wheel, and a wheel pulse number operation judgment unit used for establishing a wheel standard pulse number according to the obtained pulse number information of each wheel, comparing a corrected actually-measured pulse number of each wheel with a respective standard pulse number with the wheel standard pulse number as a comparison standard, judging whether the tire pressure is abnormal or not and sending judgment result information to a tire pressure information display unit. The system is low in cost, the situation that the tire pressures of two wheels are too low at the same time and the situation that the tire pressures of three wheels are too low at the same time can be judged, and the situation that the four wheels lack air at different degrees can be accurately judged as well; and the vehicle with the same standard tire pressure of the front wheels and the rear wheels and the vehicle with the different standard tire pressures of the front wheels and the rear wheels can be judged.

Description

technical field [0001] The invention relates to the technical field of automobile tire pressure monitoring and alarming systems, in particular to a system based on the number of wheel pulses [0002] A tire pressure monitoring and early warning system and method based on the absolute comparison method. Background technique [0003] A large amount of data shows that during the use of the car, the monthly tire air leakage rate reaches 1% to 4%, which will cause the tire to run at a condition lower than the normal tire pressure for a long time, increase the deformation of the tire, reduce the strength, and eventually burst. Tire accidents will cause serious personal and property losses; at the same time, the reduction of tire pressure will increase the rolling resistance of tires and increase the fuel consumption of vehicles. Therefore, the real-time monitoring of the tire pressure of the car, and timely alarm when abnormal tire pressure is found, will help the driver maintain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C23/00
CPCB60C23/00
Inventor 王俊昌韩宗奇韩霄王斌戴一凡王立强卢贤票
Owner 清华大学苏州汽车研究院(吴江)
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