Perkins tames complexity

  • 20-Oct-2014 11:06 EDT
1206F-E70TTA.jpg

The twin turbo 1206F-E70TTA delivers 320 hp (240 kW). Perkins states this gives OEMs the choice of a smaller engine with power equivalent to a larger displacement engine. An example of the added complexity needed to deliver that power, it features twin turbochargers—one small, one large—mounted in series in a smaller package.

The good news is that heavy-duty diesel engine providers like Perkins have met the challenge of meeting Tier 4 Final and Stage IV regulations. But there was a price in engine complexity.

“For example the level of maps and control systems have increased by a factor of 10 since EPA Tier 3 [and the introduction of Tier 4 Final],” said Mike Cullen, Product Marketing Manager, Perkins. To meet the emissions, engine makers chose differing combinations of DOC, DPF, and SCR for engines at different rated powers, along with more complex turbocharging and EGR.

One way of dealing with added complexity in one part of the system is to reduce complexity in another—in particular the operator interactions.

“To effectively deal with complexity [of the engine] while improving ease of use for the customer/operator, we have worked to minimize the users’ engine interaction, such as switches and dials, and servicing intervals. We also introduced hydraulic tappets, multi-vee belts, and single side access, which reduce workshop time and service costs,” explained Cullen. To further simplify the package, they combined a DOC/DPF canister and SCR system into one integrated module. This can be positioned remotely in a machine chassis or directly on top of the engine, according to the company.

While engine systems have more components and elements, there is an upside. “We also now have more information about how the engine is performing and what its capability is at any given moment, which has enabled the powertrain to be more highly optimized,” said Cullen. This means better machine fuel consumption, he said, along with cleaner tail-pipe emissions.

As engines have evolved, so has calibration. “These new emissions standards have increased the challenge, but as calibration and control are interlinked, the more advanced the control system it generates, the more opportunity to minimize the calibration effort,” he said.

Cullen also noted that to support engine development, Perkins developed "significant" simulation capability to support engine development and reduce development effort. “Much of our calibration is developed virtually and then validated on the engine,” he said. Gone are the days of brute-force engine dyno work.

One of the results of this work is an engine in the Perkins 1200 series. “In the off-highway machinery world, the 1206F-E70TTA delivers an estimated 5% better cycle fluid consumption over previous models—that incorporates the diesel and the DEF necessary for the SCR technology,” said Cullen.


Share
HTML for Linking to Page
Page URL
Grade
Rate It
5.00 Avg. Rating

Read More Articles On

2016-12-07
Christopher Grundler, the Director of OTAQ for the U.S. EPA, answered questions about Phase 2 rule-making for heavy trucks, global harmonization of emissions regulations, and his outlook for a new national NOx standard. Grundler will be the featured speaker on opening day of the SAE 2017 Government/Industry Meeting taking place January 25-27 in Washington D.C.
2017-03-03
Making off-highway equipment, such as construction or agriculture machines, more efficient continues to be a priority after the final phase-in of the U.S. EPA Tier 4 Final emissions regulations. “Some of the companies we work with are running out of credits and unfortunately still struggling with Tier 4,” explained Tristan Donley, Technical Director, Off-Highway Heavy Vehicles North American for Exa, a supplier of software for computational fluid dynamics (CFD).
2017-01-03
With the new SCALEXIO LabBox, dSPACE offers a compact high-performance system for hardware-in-the-loop tests.
2017-09-06
The MTEK Subsystem (Marvin Test Expansion Kit) from Marvin Test Solutions (MTS), Inc. adds test capabilities to legacy semiconductor test systems that lack the ability to meet the test requirements of current devices.

Related Items

Technical Paper / Journal Article
2011-04-12
Article
2017-02-22
Training / Education
2011-04-12
Training / Education
2013-02-20
Standard
2013-05-03
Standard
2015-10-15