Tire pressure monitoring system (TPMS), English Tire Pressure Monitor System. Its function is to monitor the tire pressure automatically in real time during the driving process of the car, and to alarm the tire leakage and low air pressure to ensure driving safety.
At present, tire pressure monitoring systems are mainly divided into two types:
One is the indirect (Wheel-Speed Based TPMS, WSB for short). This system uses the wheel speed sensor of the automobile ABS system to compare the speed difference between the tires to achieve the purpose of monitoring the tire pressure. ABS uses wheel speed sensors to determine whether the wheels are locked, and thus decides whether to activate the anti-lock brake system. When the tire pressure is reduced, the weight of the vehicle will make the tire diameter smaller, which will cause the vehicle speed to change. This change can be used to trigger an alarm system to warn the driver.
The picture above shows the direct tire pressure monitoring system
The other is a direct-type (Pressure-Sensor Based TPMS, referred to as PSB). This system uses the pressure sensor installed in each tire to directly measure the tire's air pressure, and uses a wireless transmitter to send the pressure information from inside the tire to The system on the central receiver module then displays the tire pressure data. When the tire pressure is too low or leaks, the system will automatically alarm.
China has introduced mandatory standards, and the TPMS market has great potential
According to statistics, 70% -80% of traffic accidents at home and abroad are caused by flat tires. TPMS has been recognized by the industry as an effective technology for preventing flat tires. Compared with ABS, EBD, EPS and other automotive safety system products, TPMS has "pre-emptive initiative". With the industry's emphasis on active and passive safety of automobiles in recent years, it has become the third largest safety system after ABS and airbags.
However, most of the TPMS assembly of passenger cars in China is concentrated on mid- to high-end models, and the assembly rate of small and micro vehicles is significantly lower. From 2011 to 2016, China's automobile industry developed rapidly, with a compound annual growth rate of 10.9%; in 2016, China's passenger car sales reached 25 million, but the TPMS assembly rate was only 20%. However, with the implementation of the mandatory national standard "Performance Requirements and Test Methods for Passenger Car Tire Pressure Monitoring System", only the mid-to-high-end models equipped with TPSM will greatly change the situation. The new policy stipulates that from January 1, 2019, the newly-applied type approval passenger cars will be forced to install TPMS; from January 1, 2020, passenger cars will be forced to install TPMS.
From the perspective of the development process of the TPMS industry, the main driving force of the TPMS industry is the laws and regulations of various countries and regions. The shipments of the TPMS industry are closely related to the policies issued by various countries. As China is currently the world's largest automobile market, the introduction of mandatory policies will bring about the outbreak of China's TPMS market, and the new car assembly rate will increase from the current 20% to 100% by 2021. In this way, it is only a new passenger car market In this area, China's annual demand for TPMS sensors will exceed 100 million.
In TPMS products, for safety and high performance considerations, devices that meet automotive standards must be selected. Let's take a look at the crystal oscillator that can meet their requirements.
Fox Electronics is a global leader in producing innovative frequency control technology. In the past 40 years, hundreds of the most advanced products have been developed, which can improve the performance, accuracy, reliability and stability of quartz crystals and clock oscillators. Fox takes pride in maintaining critical design and product requirements while reducing delivery time.
In the field of automotive applications: Fox provides a full range of quartz crystals and clock oscillators that meet the requirements of AEC-Q200, which can be used for long-range and short-range radar, forward-looking infrared, night vision, proximity detection, ECM, vehicle tracking, data recording, electronics Turn to assist and infotainment.
Let's take 2.0 x 1.6mm automotive grade crystal oscillator C1BA product as an example to introduce the product performance
FOX advantages:
• Minimum size of TPMS 2 x 1.6mm (part number: C1BA)
• Complies with AEC-Q200
• IATF-16949 quality management system
• Tolerances as low as ± 10 PPM
• Stability as low as ± 20 PPM
• Frequency range; 16.000 ~ 54.000 MHz
• FOX is an internationally renowned high-quality brand
In addition, the parameters of the 2 x 1.6mm automotive-grade crystal C2BA are as follows
ECS Inc., International was established in 1980. After 40 years of development, it has become the world's most reliable and recognized manufacturer of frequency control and power products.
Let's take a look at the introduction of ECX-53BQZ SMD CRYSTAL
Ultra-small and rugged ECX-53BQZ compact SMD crystal. The 5.0 x 3.2 x 0.9 mm ceramic package is ideal for harsh environments such as TPMS applications.
• Ultra-thin thickness
• 5.0 x 3.2 mm size
• Extended temperature range
• AEC-Q200 compliant
• Automotive / TPMS applications
In addition, ECX-33QZ SMD CRYSTAL, ultra-compact and compact SMD crystal ECX-33QZ is very suitable for harsh environment TPMS applications and other environments, its size is 3.2 x 2.5 x 0.8 mm.
For more details, please pay attention
