Pzev how does it work

The dual-filtration air-intake system has been updated in the PZEV to remove the gap in the dual-filtration air-intake system that can allow for emissions to escape when the engine is off. By adjusting the programming in the Engine Control Module they were able to delay ignition timing, which makes the exhaust gas warmer, which helps everything else warm up faster including the converter , which helps reduce emissions.

Why do I need it? How does it work? And it reveals how much our customers love their cars! With no special equipment needed — such as a secondary power source — the Subaru PZEV is virtually identical in design to its stable mates within the Subaru line-up.

This means that cargo capacity and interior space are not affected at all. The Subaru PZEV runs on regular unleaded fuel — something that is readily available and easy to access at filling stations across North America. For many years now, all Subaru vehicles are built in manufacturing facilities that achieve zero landfill status.

With Subaru PZEV vehicles, the remarkable reduction of smog-forming emissions is achieved through modifications in four key areas:. A larger and finer mesh of catalyst-lined passageways within a Subaru PZEV catalytic converter greatly contributes to its ability to reduce emissions.

Along the entire length of the mesh are precious metals catalysts whose role is to change the molecular structure of the offensive emissions that try to pass through. In fact, the contact area is almost twice that of a traditional catalytic converter, producing a much more effective conversion of pollutants. The fuel injectors on Subaru PZEV vehicles close tighter than conventional injectors to prevent evaporative emissions from fuel leakage into the intake manifold.

To prevent this, Subaru PZEVs are equipped with a charcoal canister in the air intake that absorbs these evaporative hydrocarbon emissions. Vehicle emissions are worst in cold start conditions. Subaru addresses this problem by altering the programming in the Engine Control Module to delay ignition timing, making the exhaust gasses hotter, which helps the catalytic converter heat up sooner, reducing emissions.

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You may withdraw your consent at any time by clicking the unsubscribe link contained within all of our commercial electronic messages or by updating your preferences with us. Submit Form. After you shut off an engine, fuel vapor remains in the combustion chamber and intake manifold.

That vapor evaporates, and like with the carbon canister, a filter of activated carbon grabs outgoing hydrocarbons before they can make it into the surrounding air. Newer designs are using a metal honeycomb filter spread with zeolite, another porous filter mineral. Close-Coupled Catalytic Converters. Catalytic converters are part of any fuel-powered passenger vehicle sold today. Exhaust gases pass from the engine through the converter, which is lined with precious metals such as platinum, palladium, and rhodium.

These convert much of the pollution gases into less harmful gases. PZEVs mount two catalytic converters closer to the engine than a conventional design does. Emissions are dirtier when a car first starts up and the converters are cold; the engine's radiating heat brings close-coupled converters up to operating temperature more quickly. After the converters the two pipes converge into one, and exhaust passes into a third catalytic converter under the passenger cabin.

This third converter cleans up nitric oxide and nitrogen dioxide, two building blocks of smog and acid rain. To be clear, PZEVs reduce emissions that lead to problems like smog. You're still burning gasoline that contributes to woes like the greenhouse effect. With Subaru PZEV vehicles, smog-forming emissions are significantly reduced through modifications to four key mechanical components. This is made of a large sieve of ultra-fine cells and coated with a thin layer of metal catalysts.

In the end, its contact surface is twice as large as that of a conventional catalytic converter, allowing it to better reduce emissions. Subaru PZEV fuel injectors are significantly more airtight than conventional injectors. This allows them to better retain fuel vapor emissions that can be caused during gasoline combustion. On a conventional car, unburned fuel vapors escape through the air intake when the engine is turned off. The Subaru PZEV counters this phenomenon by adopting an activated carbon tank in the air intake to absorb these vapors.

Once again, the result is a drastic reduction in emissions. October 23 , Tremblay Auto Groupe.