Editing CVCC (section)

== History ==
Following the establishment of an "[[Air pollution|Air Pollution]] Research Group" by Honda in 1965, its collection of emissions data from [[Automotive industry in the United States|American automakers]], and subsequent research into emissions control and [[Indirect injection|prechambers]], the first mention of CVCC technology was by [[Soichiro Honda]] on February 12, 1971, at the Federation of Economic Organizations Hall in Otemachi, Chiyoda-ku, Tokyo.<ref name=":0" />

On the advice of [[University of Tokyo]] professor Tsuyoshi Asanuma, then-Honda [[Research and development|R&D]] Director Tasuku Date, Engine-performance Research Block head Shizuo Yagi, and then-Engineering Design Chief Engineer Kazuo Nakagawa began research into [[Air–fuel ratio|lean combustion]]. After Date suggested the use of a prechamber, which some diesel engines utilized, the first engine to be installed with the CVCC approach for testing was a single-cylinder, 300&nbsp;cc version of [[Honda E engine#EA|Honda's EA engine]] installed in a modified [[Honda N360|Honda N600]] hatchback in January 1970.<ref name=":0" /> This technology allowed Honda's cars to meet [[Japan]]ese and [[United States|American]] [[Vehicle emission standard|emissions standards]] in the 1970s without the need for a [[catalytic converter]].

A type of [[stratified charge engine|stratified charge]] technology, it was publicized on October 11, 1972 and licensed to [[Toyota]] (as [[Toyota TTC|TTC-V]]), [[Ford Motor Company|Ford]], [[Chrysler]], and [[Isuzu]] before making its production debut in the 1975 ''[[Honda E engine#ED|ED1]]'' engine. As emission laws advanced and required more stringent admissible levels, CVCC was abandoned in favour of [[Programmed fuel injection|PGM-FI]] (Programmed Fuel Injection) on all Honda vehicles. Some Honda vehicles in Japan used electronically controlled "PGM-Carb" carburetors on transitional Honda D, E and ZC engines.

The 1981 amendments to the Clean Air Act made it increasingly difficult for CVCC to meet emissions and Honda joined the wider industry in using 3-way Catalysts.

In 2007, the Honda CVCC technology was added to Japan's [[Mechanical Engineering Heritage (Japan)|Mechanical Engineering Heritage]] list.