NASHVILLE, Tenn. — The Cummins X15 Efficiency Series diesel engine has won the Truck Writers of North America’s Jim Winsor 2016 Technical Achievement Award.
The presentation was made on Wednesday during an awards luncheon at the American Trucking Associations Technology & Maintenance Council’s (TMC) annual meeting here.
“The engine won for its advanced combustion design that includes a little-used Atkinson Cycle, and other features,” said Jim Park, chairman of the TWNA awards committee.
“Cummins is honored to receive the Technical Achievement Award for our 2017 X15 Efficiency series, and it is especially relevant to us that this recognition comes from truck industry writers, many of whom have experienced the enhanced drivability and responsive performance of the X15 engine first hand,” said Tim Proctor, Cummins X15 engine system technical leader.
The 14.9-liter diesel gains 3 percent in fuel efficiency over the preceding model, the ISX15, through improvements to air-handling, combustion efficiency, reduced parasitic losses and advanced electronics, Proctor said, adding that maintenance should cost 40 percent less than previous engines over five years.
Cummins redesigned its ISX15 to meet 2017 federal greenhouse gas and fuel economy requirements, and introduced two models called X15 Performance and X15 Efficiency, Proctor said.
The efficiency version employs an Atkinson Cycle in its valve action that adds fuel efficiency important to fleet managers, said John Baxter, a freelance technical writer, former mechanic and a member of the TWNA panel. That caught the attention of his colleagues in the voting.
“The engine’s valve events are modified so that compression is slightly limited, allowing for greater-than-normal expansion during the power stroke that follows,” he said. “That means that the gases expand to 20 times their volume at the pistons’ top center by the time they are released, as opposed to standard expansion factors in the range of 15-17 to 1. Allowing the burning gases more room to expand captures energy that is normally thrown away when the exhaust valve opens.
“The engine also features a new piston design that conducts heat more effectively away from the combustion bowl and into the cooling system. This takes considerable heat stress off the oil, allowing longer change intervals, and allows use of a smaller oil pump, reducing the parasitic loss associated with driving it.”
The Cummins product won out over four other finalists, all of whom had previously topped a pool of 15 candidates for the award.
A panel of industry journalists from Canada and the U.S. debated and voted over a period of several weeks.”
The panelists nominated candidates from the products and services they observed over the previous year, Park said. To be eligible, a candidate must show technical innovation, have a wide applicability and availability in trucking, and offer significant operating benefits.
For the first time this year, the award was named after Winsor, a 50-year truck journalist and TWNA member who was active in TMC and a predecessor organization. Winsor passed away in 2015.
The other four finalists were Accuride’s EverSteel wheel with a special anti-corrosion treatment; Mack and Volvo “wave” piston, part of engine upgrades to comply with new greenhouse gas and fuel economy regulations; SAF-Holland’s P89 disc brake, a high-performance, lightweight and moderate-cost braking product; and Volvo’s iSee and Mack’s Predictive cruise control, which respectively “learns” routes and operates a truck’s powertrain to gain maximum efficiency.
Park writes for Heavy Duty Trucking and Today’s Trucking. Other members of the award committee were Paul Abelson, of Land Line; Tom Berg, Heavy Duty Trucking and Construction Equipment; Jason Cannon, CCJ; David Kolman, Fleet Maintenance; James Menzies, Truck News; Jason Morgan, Fleet Equipment; Jack Roberts, Heavy Duty Trucking; and John G. Smith, Today’s Trucking.