CN102485513B - Method for detecting tire leakage - Google Patents

Abstract

The invention discloses a method for detecting tire leakage, comprising the following steps: detecting the pressure value and temperature value of a tire every a predetermined interval of T; judging whether the pressure values of the tire of N times consecutive detections are continuously reduced at every time, and judging whether the accumulated pressure reduction of the tire in the N times consecutive detections is larger than a predetermined threshold; marking the temperature value and pressure value of the last time before the pressure value of the tire of the first detection is reduced as T0 and P0, respectively marking the temperature value and the pressure value of the Nth detection as TN and PN, and judging whether a value of TN-(T0*PN/P0) is larger than or equal to 5. According to the invention, if the pressure values of the tire of N times consecutive detections are continuously reduced at every time, and in the N times detections, the pressure reduction of the tire is larger than the predetermined threshold, and simultaneously the value of TN-(T0*PN/P0) is larger than or equal to 5, the tire leakage happens. The method can effectively solve the problem of false alarm of tire leakage sent by a tire pressure monitoring system, and makes the alarms accurate.

Description

Detect the method for tire flat

Technical field

The present invention relates to the tire inflation pressure determining system of vehicle electric field, particularly relate to a kind of method that detects tire flat.

Background technology

Automobile is the modern vehicle, has become the essential vehicle of people's daily life.Along with the development of automobile industry, people are also more and more higher for the attention of safety, and TPMS (tire pressure monitoring system) is exactly the product of this safe revolution, and a lot of countries have passed through the means of law with the standard fitting of TPMS as automobile.

Be the important component part of automobile chassis due to tire, not only carrying the all-mass of automobile, also will advance to automobile provides propulsive force, and plays the effect that relaxes ground shock.TPMS can monitor tire in real time, and reminding driver is noted the potential safety hazard that may occur, and plays to shift to an earlier date trouble-saving effect.

But TPMS can not have the situation of flase alarm in situation in bad order often yet when carrying out Normal Alarm, finds by long test, and flase alarm occurs mainly due to more extraneous unexpected situations, is mainly the variation of situation and the temperature on road surface.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of method that detects tire flat, can effectively solve tire pressure monitoring system for the flase alarm problem of tire flat, makes warning more accurate.

For solving the problems of the technologies described above, the method for detection tire flat of the present invention comprises the steps:

Step 1, detect force value and the temperature value of a tire every the interval time T that sets;

Step 2, whether judge tire pressure value that N continuous time detects at every turn all in continuous reduction, and in described N time was detected, the Pressure Drop low value of this tire accumulative total was greater than the threshold value of setting;

The force value minimizing last temperature and pressure value before that tire detected is for the first time remembered respectively be T ₀, P ₀, the temperature and pressure value of this tire of detecting for the N time is remembered respectively is T _N, P _N, judgement T _N-(T ₀* P _N/ P ₀) whether more than or equal to 5; Wherein, the unit of temperature is degree Kelvin, and the unit of pressure is handkerchief;

If the tire pressure value of N continuous time detection is at every turn all in continuous reduction, and in described N time was detected, the Pressure Drop low value of this tire accumulative total was greater than the threshold value of setting, T simultaneously _N-(T ₀* P _N/ P ₀) 〉=5 are judged as tire flat.

Find through long checking, if at the high temperature storm that attacks suddenly in summer, if it is improper to detect so strategy, flase alarm easily occurs; Directly go the car carwash carwash flase alarm also easily to occur at vehicle through after long-time high-speed cruising in addition; Also have other similar situations, for example move on the road surface of jolting very much, tire pressure all can constantly change.

Adopt method of the present invention, by carrying out repeatedly force samples and just can getting rid of the interference of road surface and temperature to the analysis of temperature traverse, make warning more genuine and believable; Can solve the flase alarm problem that tire pressure monitoring system occurs in judgement gas leakage, make vehicle the truer of reflection of reporting to the police in the process of operation, the trouble of the examination of getting off when removing flase alarm from.

Description of drawings

The present invention is further detailed explanation below in conjunction with accompanying drawing and the specific embodiment:

Fig. 1 is the scheme of installation of sensor;

Fig. 2 is the schematic diagram that receives telltale;

Fig. 3 is method overhaul flow chart of the present invention.

The specific embodiment

Tire pressure monitoring system mainly is comprised of two parts, and referring to Fig. 1, first is sensor 1, and it is contained in the inside of tire 2, is fixed on wheel hub by tire tube valve, temperature that can Real-Time Monitoring tire 2, pressure, acceleration/accel situation.Again in conjunction with shown in Figure 2, second portion is arranged on for receiving telltale 3 position (what have is directly shown by instrument) that in driving compartment, chaufeur is easily observed, and can show current tire pressure, temperature and failure condition allow chaufeur understand the situation of tire.Sensor 1 and to receive between telltale 3 be that wireless signal by high frequency carries out the signal transmission.

The sensor 1 that is arranged on tire 2 the insides can constantly be measured the pressure and temperature of tire, can judge by analyzing whether tire leaks gas; If find tire 2 rapid air leakages the wireless signal by high frequency sends to and receives telltale 3 with result, receive telltale 3 and note tire fault by mode (the leakage alarm sign 7 as shown in Figure 2) reminding driver of sound and light alarm.

As shown in Figure 2, receive telltale 3 and be provided with acknowledgement key 4, temperature, pressure switch key 5 and tire switch key 6.

In conjunction with shown in Figure 3, in one embodiment of this invention, detect the method for tire flat, comprise the steps:

Step 1, detect force value and the temperature value of a tire every 6 seconds.

Step 2, judge that whether the continuous tire pressure value that detects for 8 times is all constantly reducing (that time that the pressure of the tire that namely collects each time collects before all than 6 seconds is low) at every turn, and in described 8 times were detected, the Pressure Drop low value of this tire accumulative total was greater than 0.24bar.

The force value minimizing last temperature and pressure value before that tire detected is for the first time remembered respectively be T ₀, P ₀, the temperature and pressure value of this tire of detecting for the 8th time is remembered respectively is T ₈, P ₈, judgement T ₈-(T ₀* P ₈/ P ₀) whether more than or equal to 5; Wherein, the unit of temperature is degree Kelvin, and the unit of pressure is handkerchief;

If the continuous tire pressure value that detects for 8 times is at every turn all in continuous reduction, and in described 8 times are detected, the Pressure Drop low value of this tire accumulative total is greater than 0.24bar, simultaneously T ₈-(T ₀* P ₈/ P ₀) 〉=5 are judged as tire flat.

In superincumbent description, describedly whether judge the continuous tire pressure value that detects for 8 times at every turn all in continuous reduction, the temporary tire pressure fluctuation that cause on the road surface of can avoiding jolting.Judgement T ₈-(T ₀* P ₈/ P ₀) whether more than or equal to 5, the tire pressure that can avoid causing because temperature reduces reduces.

The employing said method can be so that TPMS can carry out leakage alarm accurately in the process of using.

The interval time that detects in step 1 is not limited to and detected once 6 seconds, can change to other times according to the needs of real-time, and for example 2 seconds, 3 seconds ... 10 seconds etc.

In step 2, the number of times of continuous detecting also can be adjusted as required, and for example 3 times, 4 times ... .10 time etc.The Pressure Drop low value of tire accumulative total can suitably be adjusted according to the regulation of rules, for example can be 0.1bar, 0.2bar, 0.3bar etc.

Abovely by the specific embodiment, the present invention is had been described in detail, but these are not to be construed as limiting the invention.In the situation that do not break away from the principle of the invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.

Claims (3)

1. a method that detects tire flat, is characterized in that, comprises the steps:

Step 1, detect force value and the temperature value of a tire every the interval time T that sets;

Step 2, whether judge tire pressure value that N continuous time detects at every turn all in continuous reduction, and in described N time was detected, the Pressure Drop low value of this tire accumulative total was greater than the threshold value of setting; N is the positive integer greater than 1;

The force value minimizing last temperature and pressure value before that tire detected is for the first time remembered respectively be T ₀, P ₀, the temperature and pressure value of this tire of detecting for the N time is remembered respectively is T _N, P _N, judgement T _N-(T ₀* P _N/ P ₀) whether more than or equal to 5; Wherein, the unit of temperature is degree Kelvin, and the unit of pressure is bar;

If the tire pressure value of N continuous time detection is at every turn all in continuous reduction, and in described N time was detected, the Pressure Drop low value of this tire accumulative total was greater than the threshold value of setting, T simultaneously _N-(T ₀* P _N/ P ₀) 〉=5 are judged as tire flat.

2. the method for claim 1, it is characterized in that: N equals 8.

3. the method for claim 1, it is characterized in that: the threshold value of described setting is 0.24bar.

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