How does vvt work video

Revision This is a preview of the paper, limited to some initial content. Full access requires DieselNet subscription. Please log in to view the complete version of this paper. And as the engine approaches its rpm climax, the entire process is compressed into a window that lasts roughly one-tenth as long as it does at idle.

The dwell translates to a total opening of 0. It can adjust intake-valve lift between 0. Exhaust-valve timing: By controlling the camshaft timing independently, the engine controller can adjust the amount of overlap—the period when both the exhaust and intake valves are open.

At low-load, steady-speed cruising, this overlap is increased to allow a portion of the inert exhaust gas to flow back into the cylinder during the intake stroke, reducing combustion temperatures and the formation of oxides of nitrogen.

For maximum power at redline, fully minimized valve overlap lasts just 0. This allows for more control over how much air-fuel mixture is in the cylinder less under light-load driving, more when power is needed , controlling temperature and emissions. But that's only a very basic explanation. Join Now. New Cars. Car Culture. Type keyword s to search.

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