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22-wheel truck external tire pressure monitoring system-Truck 22 External sensors TPMS
1. Air pressure range: 0--1300kpa;
2. Temperature range: -30℃--120℃;
3. Air pressure unit kpa, psi, bar optional
4. Temperature unit: ℃, F optional;
5. Cycle display of air pressure and temperature of each wheel;
6. The car body arrangement is 2×4x4x4x4x4;
7. Repeater (signal amplifier）Installed in the middle of the bottom of the car, see the subsequent installation diagram;
Brief introduction of wireless tire pressure monitoring system:
The wireless tire pressure monitoring system (TPMS in English) is composed of a central processing unit (display) and multiple sensors. The sensors are respectively installed in the corresponding tires or on the outer valves of the tires to collect the pressure and temperature of the tires, and send the pressure and temperature data to the central processing unit installed in the vehicle compartment through wireless electromagnetic wave signals. The central processing unit judges the received temperature and pressure and displays it on the display screen. When the tire is flat, the pressure is too high or too low, the tire temperature exceeds the warning value, or the sensor fails, the driver will be alerted in the form of buzzer, graphics, etc., to effectively warn the hidden danger of tire accidents and ensure safe driving.
Abnormal tire pressure is recognized as the number one car killer in the world, and it is mandatory to install tire pressure monitoring systems in developed countries such as Europe and the United States. Information from the traffic control department shows that 70-80% of traffic accidents on highways in China are caused by tire pressure, 46% are caused by punctures, and major traffic accidents caused by punctures account for 35% of all traffic accidents. In the United States, traffic accidents are The proportion of tire pressure problems is as high as 80%, and the proportion of causes that cause punctures are: 20% of tire pressure is too high, 57% of tire pressure is insufficient, and only 23% of others. A puncture occurs when the driving speed is above 160 kilometers. The mortality rate is close to 100%, and a puncture is one of the major killers of automobile traffic accidents, so a tire pressure monitoring system is needed.
The prevalence of abnormal tire pressure: in the recent“3.15”The safety test of Chinese automobile consumer tires showed that 91% of the tested car tires have potential safety hazards. Among them, 60% of the tires have abnormal tire pressure, which can easily lead to uneven wear of the tire crown. Slowly. When the tire pressure is less than 60% of the standard value, it may be detected by the naked eye. The actual life of a camel tire is often less than 60% of its normal life.
“Tire pressure monitoring system”Legislation implementation: Following the seat belt and the third brake light, the United States, Europe, Japan and South Korea have adopted legislation to promote the application of tire pressure detection systems and mandatory installation to reduce frequent traffic accidents due to abnormal tire pressure. At present, the tire pressure monitoring system has become the standard configuration of most automobile brands in developed countries.
There are three reasons for a puncture: one is a flat tire. The tire is punctured by nails or sharp objects, causing air leakage and causing a puncture. The second is that the air pressure is too high. Due to the high speed of the car, the tire temperature rises, the air pressure rises, the tire deforms, the carcass elasticity decreases, and the dynamic load on the car also increases. If it encounters an impact, it will cause internal cracks or punctures. The third is insufficient tire pressure. When the car is driving at high speed（Speed ??exceeds 120Km／H）, Insufficient tire pressure can easily cause the carcass“Harmonic motion”This causes a huge resonance force. If the tire is not strong enough or already has“hurt”, It is easy to puncture. In addition, the lack of air pressure increases the amount of tire sinking, and it is easy to cause the sidewall to land on sharp corners, and the sidewall is the weakest part of the tire. Landing on the sidewall can also cause a puncture. Of these three reasons, the third is the most common. When the vehicle is running flat, as the tire pressure decreases, the friction between the tire and the ground increases exponentially, the tire temperature rises sharply, the tire becomes softer, and the strength drops sharply. In this case, if the vehicle is running at a high speed, it is likely to cause a puncture. If the vehicle is running at a low speed, it will also cause serious damage to the tires. This kind of damage has a long incubation period, high concealment, and its harm cannot be ignored. It also lays down the hidden danger of tire puncture when driving at high speed in the future.
The tire pressure is low, and the sidewall of the wheel has to bend once for every turn of the wheel. Suppose you run at a speed of 108 kilometers/hour and you run 1800 meters per minute, which is equivalent to 600 laps/minute = 10 laps/second = 10 sidewall bends/second. Even if the wire is bent back and forth at this speed, it will break!
The three major economic benefits of the tire pressure monitoring system: fuel saving, tire saving, and maintenance of vehicle conditions!
When the tire pressure is insufficient, the contact area between the tire and the ground increases, and the frictional resistance increases accordingly, which in turn leads to an increase in automobile fuel consumption. The tire pressure meets the standard and saves fuel by 8%-12%.
If the tire pressure is too high or too low, it will shorten the life of the tire. If the tire is short of air by 20%, its life will be reduced by 20-30%; if the tire is short of air by 30%, its life will be reduced by 45%; if the tire is overinflated by 20%, its life will be reduced by 45%. Life expectancy will also be reduced by 10%.
Insufficient or high tire pressure will also affect the optimal handling performance of the vehicle, increase the abnormal wear of the vehicle suspension system and other components, thereby increasing the use and maintenance costs of the vehicle.