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With the rapid development of automobile industry, bring convenience to people, but also the survival of the human environment more and more significant negative impact. People gradually realize that adverse environment, the ultimate victims will eventually be human. Therefor, new non-polluting, less pollution in fuel are being studied. In recent years, LPG Auto technology to mature, particularly in advanced mechanical and electrical technology and the use of computer technology, security and control to guarantee well. Without changing the original structure and dynamic vehicle based on the device by simply adding an LPG gas can be dual-fuel vehicles. Hybrid system from the carburetor fuel switching to a single point EFI-based development and multi-point EFI, fuel consumption is lower than other similar vehicles, pollutant emission levels at or better than the United States has been low emission vehicle standards.State Environmental Protection Administration issued in 2005.04.17《GB 18352.3-2005 light vehicle emission limits and measurement methods (ChinaⅢ,Ⅳstage)》, this standard specifies the implementation of the National State in 2010.07.01 IV emissions regulations,2010.07.01 from the all new production of light vehicles have to be assembled (OBD) system. In the car must also be implemented in the country one year after the installation of four emission regulations and OBD, that has been submitted to the directory for the sale of dual-fuel vehicles, to be implemented in the country since 2011.07.01 EuⅣemission regulations and the installation of OBD systems.By references, combined with years of experience in research and LPG vehicles, carried out on the upgrade JETTA LPG vehicles. To meet this standard, we have done a lot of research and experimental work, through building LPG engine bench test, emissions test combined with the method of transfer hub Preparation limit catalytic converter. Diagnostic development on the fire, through the rough degree method diagnostics, calibration Limits LPG engine rough to complete the development of the diagnosis of fire. Diagnostic part of the circuit re-design of LPG makes LPG electronic control system more responsive, fault detection rate significantly increased, when the fault produces excessive emissions, the vehicle can and enter an alarm message.At the same time high-quality product in the market to pursue, we did run for the vehicle OBD system Naijiu experiments, allowing for greatly improved reliability, consistency checks on the vehicle market, we are confident.
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