How do you reduce NOx without EGR?

How do you reduce NOx without EGR?

Advances in urea-SCR aftertreatment systems have made it possible to produce low-NOx engines without EGR….Introduction

  1. reductions in lubricating oil consumption,
  2. increases in fuel injection pressure,
  3. increased use of diesel oxidation catalysts, and.
  4. increased intake manifold boost pressure.

What vehicle conditions cause high levels of NOx emissions?

High NOx levels are normally caused by high combustion temperatures and pressures, slightly lean AFR, and excessively advanced ignition timing.

  • Tailpipe emissions readings low in HC and CO levels with high NOx emissions are typically NOT caused by a defective converter.

    How do I lower my NOx levels?

    The best way to minimize NOx formation is to reduce flame temperature, reduce excess oxygen, and/or to burn low nitrogen-containing fuels.

    Why was my NOx too high on the smog test?

    The only emission that was above the limit during the smog test was NO, however both HC and CO measurements were about halfway between “average” and maximum. A 2nd website said, “High NOX emissions are almost always due to a defective EGR valve (or some component that controls the operation of the EGR valve).

    When does the EGR system cause high NOx?

    The EGR system’s job is to re-route a small amount of exhaust gas back into the intake manifold to help reduce combustion chamber temperatures. As mentioned above NOx is created when combustion chamber temperatures reach above 2500F.

    What causes high No ( Nox ) in a car?

    Nitrogen Oxide or NO is created when an engine’s combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitric oxide emissions. Below are common failures which may cause your car, truck, van, suv, or motorhome to produce high high nitric oxide. 1.

    Do you need a catalytic converter in a non EGR vehicle?

    Non-EGR equipped vehicles rely heavily on the Catalytic Converter to assist in the reduction of NO. These vehicles have tendencies to develop CAT problems sooner then those which are equipped. If you own a non-EGR equipped vehicle, and have failed the emissions test for high NOx, pay close attention to the Catalytic Converter.