Deere’s new ‘green’ engine


Tier 4 emission compliant | New PowerTech engine adds diesel exhaust fluid to boost efficiency

NASHVILLE, Tenn. — John Deere’s solution to emissions involves a solution of urea.

Geoff Stigler of John Deere announced his company’s EPA Tier 4 final emissions solution during the Commodity Classic farm show in Nashville.

For the larger diesels, the company will combine its current-cooled exhaust gas recirculation and filtration with selective catalytic reduction by introducing diesel exhaust fluid to the exhaust stream.

Deere was the last of the big three implement manufacturers to confirm its plans for high horsepower agricultural and industrial engines.

Agco announced at the Agritechnica show in Germany last fall that its Finnish made Sisu engines, which are found in larger tractors and combines, would be using a limited amount of cooled exhaust gas recirculation to meet the Tier 4 final, European Union Stage 4 final standards.

In Nashville, Bill Preller, director of specialty business for Case IH, said his company plans to tweak its SCR system to meet the regulations.

“We don’t plan to add filtration,” he said.

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“Our relationship with (Fiat Powertrain Technologies) and the engines that we are using now to meet Tier 4 requirements will meet the 2014 requirements with just a little more work.”

Deere’s system will be based on the Powertech engine platform that meets the Tier 4 Interim, EU Stage 3B regulations.

The larger engines will use the current EGR system with a diesel oxidation catalyst, a diesel particulate filter and a SCR system.

The company said the engines will run higher fuel injection pressure to obtain better quality fuel atomization and combustion in the cylinders.

Stigler says the engines will be running higher fuel injection pressure to obtain a better quality fuel atomization and combustion in the cylinders.

“We feel our approach will let us use less diesel exhaust fluid than the competition to meet the regulations. That means our tanks can be smaller. They will need filling less often and it will mean we should have longer service intervals on our DEF filters,” Stigler said.

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“We are taking the approach that this will be about total fluid efficiency, not just fuel, but the whole package.”

The company said it learned a lot from the highway truck industry, which has had to conform to the new rules ahead of the off-road business.

Deere, along with the other manufacturers, will keep building Tier 2 and 3 powered machinery for India, China, Africa and South America, where emission rules don’t apply.

Stigler said there will likely be a cost associated with meeting the final emissions standard, but it would be competitive with other farm machinery companies.

The new engines will be rated for biodiesel blends up to B20.

The first of the Tier 4 final, ultra low emissions engines will be included in farm equipment in mid-2013 and 2014.

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