Vehicle Surveillance Solutions
Understanding Tire Pressure Monitoring Systems: Technology for Safer Driving
1. What is a Tire Pressure Monitoring System (TPMS)?
The standard GB 26149-2017, "Performance Requirements and Test Methods for Tire Pressure Monitoring Systems of Passenger Vehicles," was issued on October 14, 2017, and came into effect on January 1, 2018. According to the standard, for passenger vehicles with a mid-engine layout and a width-to-height ratio ≤ 0.9, new vehicle models must be equipped with TPMS starting from January 1, 2020, and approved models from January 1, 2021. For other M1 category vehicles, new models must be equipped with a Tire Pressure Monitoring System (TPMS) starting from January 1, 2019, and approved models from January 1, 2020.
What is a Tire Pressure Monitoring System?
A Tire Pressure Monitoring System, abbreviated as TPMS (Tire Pressure Monitoring System), is an active automotive safety system primarily used to monitor the air pressure and temperature of a vehicle's tires in real time. This system employs wireless transmission technology and utilizes highly sensitive miniature wireless sensing devices installed inside the vehicle’s tires. These sensors collect data such as tire pressure and temperature while the vehicle is in motion or stationary and transmit this information to a host unit located in the driver’s cabin. The data is then displayed digitally in real time, showing the tire pressure readings.
2. Classification of Tire Pressure Monitoring Systems
Tire Pressure Monitoring Systems can be divided into two types:
Direct TPMS and Indirect TPMS.
Direct TPMS (Direct Tire Pressure Monitoring System)
This type of system installs a pressure sensor inside each tire. These sensors use wireless transmitters to send tire pressure information to a central receiver. When the air pressure in a tire decreases, the sensor detects this change and transmits the information to the central receiver for processing. By analyzing this data, the central receiver can display the real-time pressure of each tire on the vehicle’s instrument cluster or display screen. If the pressure in any tire becomes abnormal, the system will sound an alarm and indicate which specific wheel is affected on the display.
Indirect TPMS (Indirect Tire Pressure Monitoring System)
This system relies on the signals from the vehicle’s wheel speed sensors to monitor tire pressure. When the air pressure in a tire decreases, the weight of the vehicle causes that tire's rolling radius to become smaller, resulting in it rotating faster than the other tires. Conversely, when the air pressure in a tire is too high, its rolling radius becomes larger, causing it to rotate more slowly than the others. By detecting these differences in wheel rotation speeds, the system can infer potential tire pressure issues.
The indirect TPMS (Indirect Tire Pressure Monitoring System) infers whether the tire pressure is normal by comparing the rotational speed differences between the tires. When the rotational speed difference between tires exceeds a certain threshold, the system determines that there may be an abnormality, such as low tire pressure, high tire pressure, or excessively high tire temperature. In such cases, the system will alert the driver through means such as a buzzer or voice warning.
3.1 Monitoring Accuracy and Display Method:
The direct TPMS can directly display the specific tire pressure values for each individual tire, offering higher accuracy. When tire pressure is too low or there is air leakage, the system will automatically trigger an alarm to remind the driver to take timely action.
In contrast, the indirect TPMS can only detect abnormal conditions of the tires—such as identifying potential tire pressure issues based on differences in wheel rotation speeds—but it cannot provide specific tire pressure values.
3.2 System Cost and Application Scope:
The direct TPMS requires a separate sensor to be installed in each tire, which increases the overall system cost. However, because it provides detailed and accurate tire pressure information for each tire, it is particularly valuable for high-end vehicles or special applications (such as commercial vehicles) where precise knowledge of tire status is essential.
The indirect TPMS, on the other hand, has lower costs and is suitable for standard or economy vehicles. Although it does not offer exact tire pressure readings, it is generally sufficient for routine driving scenarios to detect abnormal tire pressure situations.
Both the direct and indirect TPMS solutions have their own advantages and disadvantages. The choice between them depends on the specific needs of the vehicle and the intended application scenario.
4. Functions and Benefits of the Tire Pressure Monitoring System (TPMS)
Preventing Accidents:
By continuously monitoring the tire pressure and temperature in real time, the TPMS can promptly issue alerts when abnormal conditions are detected, reminding the driver to take appropriate measures. This helps effectively prevent traffic accidents caused by tire-related issues, such as blowouts or loss of vehicle control.
Extending Tire Lifespan:
Real-time monitoring of tire pressure and temperature allows drivers to adjust the tire condition in a timely manner, ensuring that the tires operate within safe pressure and temperature ranges. This reduces tire wear and damage, thereby extending their service life. Not only does this help save on repair and replacement costs, but it also contributes to improved driving safety by minimizing tire-related risks.
Improving Fuel Economy:
When tire pressure is too low, it increases the friction between the tires and the road surface, leading to greater rolling resistance and higher fuel consumption. A TPMS helps drivers maintain optimal tire pressure by providing timely alerts, allowing the tires to operate in their best condition. This reduces unnecessary fuel consumption and improves overall fuel efficiency.
Reducing Suspension System Wear:
Stable tire pressure helps reduce impact forces transmitted to the vehicle’s suspension system. By maintaining proper tire inflation, the TPMS indirectly contributes to less stress and wear on suspension components, helping prolong the lifespan of the suspension system as well.
5. Development Trends of Tire Pressure Monitoring Systems (TPMS)
The future development of Tire Pressure Monitoring Systems can be summarized in the following key directions:
1. Integration:
Future TPMS will become more compact and integrated. This mainly involves integrating various functional components—such as pressure sensors, temperature sensors, acceleration sensors, microprocessors, and RF (radio frequency) transmission circuits—into a single chip. This integration not only reduces the overall weight of the module but also maintains the dynamic balance of the tire without compromising its performance.
2. Passive Power Supply:
Currently, most TPMS rely on battery-powered sensors, which require periodic battery replacement—a maintenance challenge for users. The future direction is to adopt new energy supply methods, such as
piezoelectric effects or wireless electromagnetic energy harvesting, to reduce or even eliminate the need for battery replacements. This will greatly enhance user convenience and system reliability.
3. Higher Accuracy:
Improving the accuracy of alerts and measurements is a major focus in the evolution of TPMS. This depends on advancements in system algorithms, enhanced detection precision of pressure sensors, and better anti-interference capabilities of wireless communication. Additionally, the widespread adoption and continuous improvement of MEMS (Micro-Electro-Mechanical Systems) sensors are driving competition in the sensor market, further pushing the development of more accurate TPMS.
4. Intelligence:
With the advancement of connected vehicles (V2X), automation, and vehicle intelligence, TPMS is also becoming smarter. For example, TPMS components may be directly embedded in other vehicle parts—such as within the tire layers—for seamless and real-time monitoring. Furthermore, TPMS functions may be integrated into the vehicle’s ECU (Electronic Control Unit), enabling the vehicle to intelligently recognize its components. This ensures that replacing parts won’t negatively affect the TPMS functionality, improving overall system intelligence and adaptability.
5. Network Connectivity:
In the future, TPMS will be connected to vehicle networks, enabling real-time data transmission, comparison, and analysis. This allows the system to provide more accurate and personalized recommendations. In critical or hazardous situations, the system may also initiate protective measures automatically, further enhancing vehicle safety.
Conclusion:
The future development of TPMS is heading toward integration, passive operation, higher accuracy, intelligence, and network connectivity. These advancements will significantly improve vehicle safety, driving convenience, and user experience.
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