BYD DM-i technical analysis: achieving decoupling of engine and wheels and emission control meeting standards

News on May 29. According to the editor’s understanding, Great Wall Motors recently issued a statement saying that they have reported problems with two BYD hybrid models to three government agencies. These two models use atmospheric fuel tanks instead of high-pressure fuel tanks, which may release volatile organic compounds that do not meet emission standards.

BYD responded, stating that its products and related tests comply with national standards and have been certified by national authorities. Today, BYD stated on the interactive platform that BYD DM-i adopts a dual-motor series-parallel architecture based on the electric vehicle platform design to achieve decoupling of the engine and wheels, allowing the engine to flexibly start in pure electric mode and allowing Fuel vapor can desorb freely. BYD said they conducted in-depth research on the characteristics of the carbon canister and independently developed fuel vapor emission control technology for atmospheric fuel tanks to make it comply with evaporative emission regulations.

According to BYD, this technology can enable PHEV vehicles to automatically start the engine before the carbon canister is saturated, thereby solving the emission problem. They said that this process only takes about 4 minutes, will not increase fuel consumption or noise, and can simultaneously complete functions such as fuel vapor desorption, vehicle power generation and engine maintenance. BYD emphasized that this technology is reasonable and meets legal requirements.

Currently, the controversy over the use of atmospheric fuel tanks in BYD hybrid models is still ongoing. As a result of Great Wall Motor's report, the public began to pay attention to the emission performance issues of BYD models, although BYD insisted that the technology and emission control of its products complied with relevant standards. Government agencies will investigate and evaluate the issue to determine whether the vehicles have substandard emissions. We will continue to pay attention to the progress of this matter and report to readers in a timely manner.

According to the editor’s understanding, Great Wall Motors recently reported to three government agencies that two of BYD’s hybrid models use atmospheric fuel tanks instead of high-pressure fuel tanks, which is suspected of substandard emissions. BYD responded that its products and testing comply with national standards, and it has independently developed fuel vapor emission control technology for atmospheric fuel tanks, which can meet regulatory standards. The two sides have different views on this issue, and relevant government agencies will investigate and evaluate this issue.

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