Suzhou diesel exhaust treatment liquid wholesale Suzhou automobile exhaust treatment liquid that has to sell on the basis of analysis of current situation of vehicle exhaust testing technology at home and abroad on the proposed optical platform, the need for speed RPM module developed for gas detection core modules, exhaust gas analysis . By using the new electromechanical integration infrared analysis technology, with embedded software and hardware systems, we have developed an integrated optical gas detection platform. Based on vibration and noise analysis principles and DSP signal analysis and processing technology, developed a new type of speed sensor. These two exhaust testing mode supporting the development of domestic, greatly reducing the foreign country in accordance with the core components of patience, will further promote the development of China's automobile inspection and maintenance techniques. Introduction In recent years, with the rapid development of automobile industry and the rapid increase in car ownership, vehicle emission pollution has become a major source of pollution, especially in large cities, has become the primary vehicle emission pollution pollution control vehicle exhaust voice increasingly intense. China's current emission standards in car idling law. Since only requires measuring emission concentration HC, CO, and has been unable to meet the current needs of automotive technology and environmental requirements. In 1999 the State Environmental Protection Administration began requiring the installation of vehicle exhaust measurements closed-loop control and three-way catalyst system with dual idling method, and gradually implement BASM. In 2003 Beijing launched BASM. July 1, 2005 related to automobile exhaust emission limits and measurement methods GB18285-2005 release, provides two-speed idle test equipment and technical conditions the exhaust gas and the steady-state operating conditions, transient conditions and Simple Transient France and other measurements. While the development of the automobile industry led to the development of China's auto repair industry. In order to regulate its development, the transportation departments began to manage comprehensive auto repair industry, started in 1997, "industry of vehicle maintenance conditions" national standards maintenance market has brought a positive role. 2004 automotive new form of service business development, a new "auto repair industry of" standards, and on January 1, 2005 came into effect. The new standards require that two or more classes of service companies must have allowed the opening of the exhaust gas analyzers, thus stimulating demand for maintenance exhaust analyzers. Exhaust gas analyzer in the past there are a number of testing stations and the state environmental protection departments to purchase, is a "fine tool." General maintenance companies have very little. But the new industry of vehicle maintenance conditions exhaust gas analyzer as a "repair tool." Exhaust gas analyzer previous purchase amount required is generally borne by the administration, since the test has a quick profit may, therefore exhaust gas analyzer price is not very sensitive. But for auto repair business, a lot of companies are private nature, small scale enterprises, in the case of maintenance technology is not developed, the maintenance staff also far from exhaust gas analysis considered as a service means, contrary to its own gas detection may bring disputes concerning the quality of maintenance. So the exhaust gas analyzer for service enterprises, is not a voluntary demand. High price of exhaust gas analyzer is difficult in our service business has been promoted. China's current exhaust gas analyzer manufacturers have more than 10, mostly using imported core optical platform (NDIR three gas sensors) assembly. Major international platform suppliers Adros, Sensors, Horiba, City Tech and other. Although China also has companies have developed over the exhaust optical platform, due to China's infrared gas analysis technology depends mainly on the 1980s and the introduction of foreign joint ventures, entering the 1990s, especially with the development of IT technology, international infrared gas analysis technology has been rapid development, the price plummeted, domestic conventional technology in product performance and production costs do not have a competitive advantage. Domestic product publicity in the "imported advanced optical bench" advantage is that the enterprises actually a last resort option. Imported off learning platform not only greatly increases the overall cost of the instrument, while the maintenance is difficult. Therefore exhaust testing core optical platform localization is necessary. Further supporting the speed and the exhaust gas detection sensor (RPM) as well as with the development of two-speed idle mode inspection technology demand. China is currently widely used way to measure the speed clamp engine speed. Speed ??clamp mode measurements need to open the hood, but also easy to damage, for compression-ignition engines can not adapt. From an international point of view the use of gas detection line, mostly inclined to adopt the principles of speed sensor vibration and noise production. Noise and vibration measurement principle in theory the speed is very mature, but as a dedicated module engine speed measurement domestic product has not yet mature. Internationally, Austria AVL company launched 490 products is to use the principle of speed sensor production line in our gas detection has been widely used. To control motor vehicle emissions, China in recent years has increased the construction of gas detection stations, regardless of speed idle or other conditions were detected, exhaust gas analyzer RPM sensor and speed are the basic configuration. Therefore, the development of new speed sensor (RPM) is also very necessary. 1. The exhaust gas analysis sensors (optical bench) NDIR (NDIR) gas analysis technology is the key technology of exhaust gas component detection. Conventional NDIR gas sensors using nickel Nuo wire as an infrared light source, the use of electrical machinery modulated infrared light, the use of thin-film capacitor microphone or InSb like as sensors. As a result of motor mechanical modulation, equipment power consumption, and poor stability, instrument cost is also high. While using film as a capacitor microphone sensor makes the instrument very sensitive to vibration, and therefore not suitable for portable measuring exhaust, production costs are high. With the development of infrared light, infrared detectors and electronic technology, NDIR infrared gas sensor in overseas development has been rapid. Mainly in the use of new infrared sensor and electrical modulation light on the instrument circuit uses a low-power embedded systems, making the instrument has a conventional instrument incomparable advantages in size, power, performance and price. 1.1 NDIR principle when exhaust gas analysis when the infrared light through the test gas, the gas molecules to specific wavelengths of infrared light absorption, the absorption relations obey Beer - Lambert (Lambert-Beer) absorption laws. Provided the incident light is parallel light, its intensity I0, the intensity of the emitted light is I, the thickness of the gaseous medium is L. When light is absorbed by the gas medium number of molecules dN caused by the intensity decreases when dI, according to Lambert - Beer Absorption Law: dI / I = -KdN, where K is a proportional constant.