Views: 94 Author: Site Editor Publish Time: 2020-05-07 Origin: Site
Tire pressure monitor system refers to an auxiliary system that can be installed on a vehicle to monitor tire pressure in a certain way and report an alarm when tire pressure is abnormal. The following will continue to introduce two types of TPMS standard regulations.
This standard specifies the test method and performance requirements of tire pressure monitoring system installed in tubeless tire. It mainly specifies the specific test methods for the temperature resistance, thermal cycle, thermal shock, extreme temperature resistance, humidity resistance, frosting resistance, pressure resistance, rapid air leakage, altitude resistance, dirt resistance, salt spray corrosion resistance, drop resistance, mechanical shock resistance, electromagnetic compatibility of the tire pressure monitoring sensor module. In terms of performance, specific requirements are given for the display method of the alarm signal, the working conditions of the system, and the most basic performance. The standard stipulates that the system should monitor the tire pressure from 24km / h to the maximum speed. The standard does not require measurement accuracy, does not limit the service life of the product, and the response time of the undervoltage alarm is long, which is basically similar to FMVSS 138 in function.
The standard applies to tire pressure monitoring systems used for tubeless tires, and requires monitoring of all tires used and providing information to the driver. The standard specifies comprehensive performance requirements for systems and components. The standard specifies that the tire pressure should be monitored by the tire pressure sensor after the vehicle speed exceeds 25km/h. The system is divided into the following levels, and the qualitative requirements are given for the performance of each system.
The tire pressure alarm system refers to a system that measures tire inflation pressure and internal temperature or parameters corresponding to the pressure, and sends a message to remind the driver that the tire inflation pressure limit has reached the required measures.
The tire pressure warning system can provide useful information to the driver, including the actual pressure status of each tire. The purpose is to issue a warning when the tire requires corrective action.
When the tire leakage alarm system detects that a certain tire pressure in use has a significant change from other tire pressures and relative to its initial air pressure, TLAS will be required to take measures.
The above three standards impose requirements on TPMS from different sides, but for the product that requires extremely high safety and reliability, these standards and regulations still have some shortcomings in requirements. For example, how to ensure the reliability and stability of the system signal transmission, how to ensure that the system can reach a service life of more than 6 years, how to avoid false alarms and missed alarms, etc. These are the difficulties and key technologies in the TPMS system design, as well as the difficulties in formulating standards. This standard is more applicable than FMVSS 138 and SAE J 2657, but it does not require TPMS to work when the vehicle is stationary.
The development of automobile electrification and intelligence has made automotive safety systems more and more concerned. As an active early warning technology, the formulation of TPMS standard regulations will be more perfect in the future.
