Views: 185 Author: Site Editor Publish Time: 2020-05-07 Origin: Site
Status Of TPMS Standards And Regulations in Countries Around The World
The United States is the first country in the world to formulate and enforce TPMS regulations. Driven by US federal legislation and market opportunities, major automotive electronics enterprises have invested heavily in TPMS. At the same time, many well-known chip manufacturing enterprises have joined in to continuously launch a new generation of products with smaller size, lighter weight, more reliable performance and longer service life. At present, TPMS equipment has been very popular in the United States.
The International Organization for Standardization (ISO) formulated the international standard ISO 21750: 2006 for tire pressure monitor systems in March 2006. The American Society of Automotive Engineers also developed the SAE J 2657 standard for tire pressure monitoring systems for light vehicles in December 2004. The current international automobile regulations and standards items that can be referenced are: FMVSS 138 tire pressure monitoring system, SAE J 2657: 2004 light vehicle tire pressure monitoring system, ISO 21750: 2006 road vehicles tire pressure monitoring system for improving vehicle safety.
In addition, the Japanese Automobile Standardization Organization (JASO) has also developed a technical document for the TPMS real vehicle test method. Its technical content is basically a refinement of the US FMVSS 138 regulations. At the 62nd meeting held in September 2007, JASO was decided to establish an informal TPMS working group, with Germany as the chair country to promote the formulation of the regulation. In November 2007, February 2008 and September 2008, the informal working group meeting was held to explore the feasibility of formulating ECE regulations related to TPMS. From the contents of several meetings, the difficulty of this work was much greater than expected, and the progress is not fast.
This regulation is a mandatory safety standard. In terms of performance requirements, only the most basic functional requirements are specified. That is, when the tire pressure is lower than the specified air pressure value, the tire pressure sensor should issue an under-pressure visual alarm signal within 20 minutes. FMVSS 138 regulations stipulate the relevant requirements of visual alarm signals, and also stipulate the test conditions, test procedures and detailed implementation transition period. The specific requirements of the US FMVSS 138 regulations on the performance of the TPMS system are:
(1) The TPMS system must start when the car ignites and issue an alarm when the tire pressure drops by 25%.
(2) In case of TPMS system failure, an alarm must be given to the driver.
(3) The TPMS warning light must remain on until the tire is inflated to normal air pressure or the system is out of order.
(4) A self check must be carried out for the warning lamp on the instrument panel when the car is ignited.
(5) The owner's manual must include a warning that there may be a mismatch in tire replacement.
(6) Automobile manufacturers must gradually increase the proportion of assembled TPMS. The assembly rate of four-wheel passenger vehicles and commercial vehicles with a maximum design gross mass not exceeding 4536 kg sold in the United States after September 2007 must reach 100%.
(7) It stipulates that the TPMS performs air pressure monitoring when the vehicle speed is 50-100km / h.
Due to the restriction of the technical level at that time, American regulations only stipulate the most basic undervoltage alarm function, and take into account the indirect TPMS system (that is, the way of indirectly calculating the tire low pressure through the wheel speed sensor). However, due to the defects of the indirect TPMS system itself, the products meeting the regulations are not necessarily safe and reliable products, and in the specific application process, users complain about frequent false alarms of the products.
