1. the TPMS tire pressure monitoring system
effect TPMS (Tire Pressure Monitoring System) is a real-time automatic monitoring of tire pressure in the vehicle is in motion, and a flat tire and low pressure alarm, in order to ensure road safety.
Currently, the tire pressure monitoring system is mainly divided into two types:
An indirect formula (Wheel-Speed Based TPMS, referred WSB), such a system by the ABS. wheel speed sensor to compare the difference between the rotational speed of the tire, 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. Belong after the passive type.
Another formula is the direct (Pressure-Sensor Based TPMS, referred to the PSB), such a system is to directly measure the tire pressure, using a wireless transmitter to a pressure using a pressure sensor installed in each tire of sending information from inside the tire to a central receiver system on the module, then each of the tire pressure data is displayed. When the tire pressure is too low or leakage, the system will alarm. Belonging to advance the initiative defensive, such as driving Wei Tai TPMS.
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.
AnotherThe TPMS compound, which 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 indirect systems, where two or more coaxial or run flat tire can not be displayed; monitoring failure of the vehicle speed 100 km / 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.
in Europe and North America, more than 75 percentage automotive original equipment imported SCHRADER tire pressure monitoring system
TPMS works
installed on the tire tread dice a built-in sensor, the sensor comprising an electrical bridge electronic pressure sensing device sensing the pressure, it is converted to electrical pressure signal, via the wireless signal transmitting means transmit out.
TPMS by being mounted on each of the tires high sensitivity sensor in traffic or stationary state, the pressure in real-time monitoring of the tire, temperature and other data, and transmitted to the receiver through a wireless manner, displayed on the display various data variations or the like in the form of beep to alert motorists. And leak alarm when the tire pressure changes and exceeds the safety threshold (this threshold can be set through a display), in order to ensure traffic safety.
in time for the driver can be aerated or tire deflation based on display data leakage can be found in time, let the big surprise able to resolve in a small place.
the TPMS functions:
◆ full-time monitoring tire pressure;
◆ alternately displays the current tire pressure and temperature;
◆ a high pressure low pressure alarm, high temperature alarm;
◆ rapid leak alarm;
low battery alert ◆ host cell; automatically close the display
◆ parking;
the host may automatically enter a power saving mode stop ◆ battery;
◆ be set according to a corresponding standard pressure value of the tire and the vehicle position.
mounted tire pressure monitoring system (TPMS) What are the benefits:
(1) effectively prevent puncture;
(2) effectively prevent the tire caused by runflat damage;
(3) effectively avoiding an increase in fuel consumption;
(4) ensuring optimum handling performance of the vehicle;
(5) avoids abnormal wear of the vehicle component.
British imported SCHRADER wireless tire pressure monitoring system TPMS provides ultra-safe enjoyment away from the puncture hazards, enjoy the fun of driving for you and your family!
Direct TPMS advantages and disadvantages of the indirect TPMS is:
advantages
the direct TPMS: pressure and temperature of the tire is induced through an electrical bridge electronic sensing device in real time, the resulting data is accurate result of measurement, It is the industry mainstream, formal, professional approach.
disadvantages are: higher production costs, require professional installation and maintenance.
advantage
indirect TPMS are: low cost, you can just install a software analysis.
disadvantages are: 1) monitoring the accuracy is not enough, just an estimate of the results, only when a serious shortage of tire pressure in order to detect it. 2) when there is insufficient tire pressure warning system, which can not display specific tire problems, we will get four tires individually detected can be determined.3) the tire air pressure can not be displayed normally only in alarm, only the warning symbol appears. And can not do monitoring of high pressure and high temperature. 4) the vehicle in a stationary state, and at low speeds, or when the system is inoperative crater uneven road driving. 5) When the pressure is less than four tires at the same time, such as when the seasonal temperature changes, the system can not tell. 6) When put on the spare tire easily lead to false positives, because there is no spare tire wear, tire diameter is larger than the other. 7) changing snow tires easily cause false positives because of the large diameter snow tires and normal tire. 8) When turning at a faster rate, prone to false alarms, because the rotational speed is greater than the outside of the tire inside the tire. 9) Under certain weather or road conditions, tire may slip, causing several different speed tires, can easily lead to false positives.