1, the importance of tire pressure monitoring
Data showed that the proportion of a car accident caused by a puncture share of the vicious traffic accidents is very high, and all cause explosion when the tire factor in the lack of the primary causes of tire pressure. This is not sensational, even if you do not choose vehicles with tire pressure monitoring, but also increase the importance of vehicle tires, and the car to avoid serious damage occurs.
When the tire pressure is too high, it will reduce the contact area of the tire and the ground, and at this time the tire is subjected is relatively increased pressure, tire grip will be affected. In addition, when the vehicle passes Goukan or bumpy road, there is not enough space inside the tire to absorb shock, in addition to affecting driving stability and ride comfort, it will also impact the intensity of the suspension system increase, which will bring harm. Meanwhile, at a high temperature puncture hazard is increased accordingly.
2, tire pressure monitoring principle
1. Direct direct TPMS tire pressure monitoring means is a pressure sensor installed in each tire to direct measure the tire pressure, using a wireless transmitter to transmit pressure information from inside the tire to a central receiver module, and then each of the tire pressure data is displayed. When the tire pressure is too low or leakage, the system will alarm.
2. The operation principle of indirect tire pressure monitoring indirect tire pressure monitoring are: to reduce the pressure of a tire when the weight of the vehicle causes the rolling radius of the wheel will be smaller, which results in the other speed ratio wheels fast. By comparing the difference between the rotational speed of the tire, to achieve the purpose of monitoring tire pressure. Indirect tire alarm system is actually relies on computing the rolling radius of the tire air pressure monitoring.
3. Two features of the two pressure monitoring tire pressure monitoring devices have advantages and disadvantages. Direct tire pressure monitoring device may provide more advanced features, any time the actual instantaneous measurement of the internal pressure of each tire, a failure readily determinedTires. Indirect system cost is relatively low, it has been equipped with four ABS (each tire equipped with a wheel speed sensor) only automobiles software upgrade. However, indirect tire pressure monitoring system means there is no direct high accuracy, it does not determine tire failure, but an extremely complex system calibration, the system will not work in some cases, for example, two of the same axle tire air pressure is lower Time.
in Europe and North America, to improve people’s safety awareness through appropriate laws and regulations (such as: The European Commission will force the car to install tire pressure monitoring system). Tire pressure monitor manufacturers mainly in the United Kingdom schrader represented in terms of tire pressure monitoring has mastered the core of the world’s most high-end technology, its tire pressure monitoring products have occupied the European market vehicle original equipment tire pressure monitoring system more market share percentage TPMS75 . When
1, to prevent accidents
belongs to a tire pressure monitoring system active safety device, which can occur in the tire danger signs promptly alarm to alert the driver to take appropriate measures to avoid the occurrence of serious accidents.
2, extend tire life
With the tire pressure monitoring system, we can always make the tires are maintained at a predetermined pressure, the working temperature range, thereby reducing damage to tires, extend tire life. Data displayed with insufficient tire pressure, when the wheel 10 percentage pressure drop than normal, the life of the tire 15 is reduced percentage.
3, so that more economical driving
When the air pressure in the tires is too low, the tire will increase the contact area with the ground, thereby increasing the frictional resistance, when the tire pressure is lower than the standard pressure percentage value 30, fuel consumption will rise by 10 percentage.
4, can reduce the wear of the suspension system
When the tire pressure is too full, it will lead to reduced damping effect of the tire itself, increases the load on the damping system of the vehicle, the long-term use of the engine and the chassis suspension systems It will cause great harm; if uneven tire pressure, also easily lead to brake deviation, thereby increasing suspension system wear.
4, the type of tire pressure monitoring system
(Wheel-SpeedBasedTPMS, referred WSB), such systems are compared by the tire wheel speed sensors of ABS. the difference between the rotational speed, for the purpose of monitoring tire pressure. ABS determines whether locking of the wheels by the wheel speed sensor, to determine whether to start antilock brake systems. When the tire pressure decreases, the weight of the tire diameter of the vehicle will become smaller, which leads to the vehicle speed change, this change can be used to trigger an alarm system to warn the driver.
(Pressure-SensorBasedTPMS, referred to the PSB), such a system is to directly measure the tire pressure, using a wireless transmitter with a pressure sensor installed in each tire of the inside of the tire pressure information transmitted from the the central system to the receiver module, and then each of the tire pressure data is displayed. When the tire pressure is too low or leakage, the system will alarm.
Both systems have advantages and disadvantages. Direct systems can provide more advanced features, at any time determine the actual instantaneous pressure inside each tire, it is easy to determine the tire failure. Indirect system cost is relatively low, it has been equipped with four ABS (each tire equipped with a wheel speed sensor) only automobiles software upgrade. However, the indirect system there is no direct system with high accuracy, it does not determine tire failure, but an extremely complex system calibration, the system will not work in certain situations, such as the same axle 2 when tire pressure is lower.
It combines the advantages of both systems, it is equipped with sensors directly in two mutually diagonal tire, equipped with a four and indirect systems. Compared with all the direct system, such composite systems can reduce costs and overcome the indirect system can not simultaneously detect a plurality of tire pressure is too low disadvantages occur. However, it still can not provide real-time data for all four tire actual pressure within the system as well as direct.
Current tire pressure monitoring system still needs to improve there are many areas for improvement. For indirectSystems, where two or more coaxial or run flat tire can not be displayed; monitoring failure of the vehicle speed 100km / h or more. For the direct system life, stability and reliability of wireless signal transmission, the sensor, the accuracy of alarm (with or without false positives, false positives) and the like are pressure sensor needs to be improved.
tire pressure monitoring system has been installed in Audi, BMW, Mercedes, Ferrari, Porsche and Volkswagen of some models, it can be said TPMS is still a relatively high-end products, from the popularity and popularity there is still a long distance. According to statistics, in 2004 the United States, registered in the register of 35 percent of new cars are equipped with TPMS, 2005 is expected to reach 60 percentage. In attaches great importance to the future of vehicle safety, tire pressure monitoring system will sooner or later become standard on all cars, like the ABS from there to the popularity of the same, it requires a process.
5, the installation steps
1, the wheel mounting stem into the valve bore
2, on the hub
3, mounted to the valve stem Hex nuts.
4, use a wrench to the valve stem, and maintain the vertical, while the use of a torque wrench to tighten the hex nut.
5, the sensor mounting ,, so that the TPMS sensor adapted to the decrease of the wheel. Wrench valve stem, and maintain the vertical position, and then tighten the screws 4NM (+ – 0.5) torque.
tire pressure monitoring – the world’s first belt quot; tire pressure monitoring quot; GPS function
the world’s largest navigation device maker Garmin (Derek) in the fall of 2010 the new conference the released product with a tire pressure monitoring function: nuuml; vi1320. Aircraft in addition has Garmin (Derek) family of products many standard features, the wireless tire pressure monitoring system which can be described as a bright spot, it can fully monitor the vehicle tire pressure, temperature, and battery voltage data and the like through the wireless receiver, thereby improving the running safety, to provide users with basic navigation functionAt the same time can also on the insurance policy for the safety of users.
nuuml; vi1320 1355 is based on the integration of a wireless tire pressure monitoring system, with associated mounting hardware detection, the wireless data receiving comprehensive monitoring tire pressure, tire temperature, battery voltage. According to the test, the tire pressure monitoring system, can prolong the life of the tire 40 percentage, the percentage of fuel savings 5. Use GPS to make up for lack of cars without tire pressure monitoring systems, while providing basic navigation, but also reduces the cost of fuel consumption, extend the life of the tire, effectively avoid the risk of a puncture, described as threefold.