Many of today’s Perkins diesel engines are very different from previous generations largely due to the systems included to meet EU Stage V and U.S. EPA Tier 4 Final emission standards. We have created a short True or False quiz designed to help people who depend on those engines understand the changes and the technologies behind them.
Have fun, and see how many answers you already know.
True or False: Eliminating black smoke is the major focus of emission standards.
False. The unburned carbon particles, or Particulate Matter (PM), that cause black smoke are only one of the regulated emissions, and over the last 25 years they have reduced by up to 27 times. Equally important, however, are reductions in hydrocarbons, carbon monoxide (CO) and nitrogen oxides (NOx).
Hydrocarbons, carbon monoxide and particulate matter are all products of incomplete combustion which is addressed with technologies including common rail fuel systems and multiple valves per cylinder as well as Diesel Particulate Filter (DPF) aftertreatment.
True. Particulate matter is mainly carbon particles from unburned diesel fuel and lubrication oil. The DPF traps these particles to remove them from the exhaust stream. The emission control system periodically generates high temperatures in the DPF to completely oxidise the trapped particles and ‘regenerate’ the filter. Perkins technology makes this process transparent to the operator.
False. NOx is produced by the reaction of nitrogen and oxygen contained in the combustion air. More NOx is produced at the higher temperatures produced by today’s more efficient combustion processes.
Perkins emission control technologies, including Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR), are used to reduce the NOx produced in today’s more efficient engines.
False: EGR was one of the earliest technologies used for NOx reduction and it still has an important role. But today it works with Selective Catalytic Reduction (SCR) using Diesel Exhaust Fluid (DEF) as an integrated system to control NOx emissions.
EGR works by capturing and cooling a small amount of exhaust gas and then recirculating it back into the combustion chamber to dilute the oxygen level and lower combustion temperatures. Lower combustion temperatures increase hydrocarbons, carbon monoxide and particulate matter so the EGR system has to be carefully balanced with the other emissions control technologies in use. Adding SCR to reduce NOx outside the combustion chamber allows more efficient use of EGR within the combustion chamber.
DEF is used to generate ammonia within the SCR which catalyses a chemical process that reduced NOx to nitrogen and water. The entire system—EGR, SCR and DEF—is regulated and balanced by the engine’s emission control software and requires no operator attention beyond adding DEF periodically.
True. Actually, Perkins uses three different crankcase ventilation systems; open circuit, filtered open circuit and closed circuit. All remove gases that leak past the piston and build up in the crank case. They need to be removed to avoid pressure build up that could eventually escape past oil seals and gaskets. They are, however, considered to be emissions so crankcase ventilation systems have to be designed and serviced to meet standards.
Open circuit systems are simply vented to the atmosphere through a gauze filter in the valve cover and a hose running down the side of the engine.
Filtered open circuit systems add a filter/separator that route fluids back into the engine and allows gases to be vented to the atmosphere.
Closed circuit systems vent the gases directly into the air intake, so they are recirculated through the combustion system.
All three systems use a filter which needs to be maintained at regular intervals as recommended in the engine’s service manual.
Perkins Latin American agricultural initiative is breaking new ground.Read more
Secodi: providing quality power and end-to-end service for 45 years.Read more
PTTN has been the authorised Perkins distributor since 1976.Read more
We talk to the owner, founder and chairman of Supernova Engineers Limited.Read more
Providing full value and the most worry-free ownership experience possible.Read more
We talk to the founder and CEO of Captiva Energy Solutions.Read more
Listening to our customers creates better solutions.Read more
Part four of our 'Engines that made Perkins'.Read more
They're easier to control than you may think.Read more
Restoring the portrait of Frank PerkinsRead more
Interview with engine enthusiast Jeffrey Giblin.Read more
A distributor is more than a place to buy parts.Read more
Perkins heritage - part 3: focusing on the 1000 Series.Read more
Employees share their thoughts on the brand and how it supports its customers.Read more
Refurbishing, overhauling or rebuilding your Perkins engine just got easier.Read more
Perkins is committed to sustainable manufacturing at every one of its global facilities.Read more
The 4.236 and 3.152 engines cemented Perkins’ position as ‘the’ farming diesel engine.Read more
Meet Kajsa Mildén, a businesswoman with multi-industry experience, and the current CEO of Universal Power Nordic, our distributor for Sweden and Norway.Read more
Since 1932 over 22 million diesel engines have rolled off our production lines, initially from the Peterborough, UK, factory and now from facilities around the world.Read more
Your engine is in the capable hands of the Perkins distributor network, meaning access to trained technicians, genuine parts and a customer focused business approach.Read more
The basic principle of fuel injection is the right amount of fuel must be injected at the right time to satisfy horsepower demands.Read more
A diesel engine is an amazing piece of engineering.Read more
Our top tips to keep your engine running when it's cold.Read more
Get the most from your low-emission diesel engine.Read more
There's a lot more to coolant than water and antifreeze.Read more
Filtration - the key to protecting your engine investment.Read more
Perkins fluid sampling - delivering a new level of engine insight.Read more
There are no ordinary days for a Secodi technician.Read more
When a customer needs service, PTTN delivers - no matter what.Read more