New technology from Delphi estimated to reduce emissions by 15-20 percent could find its way into future GM trucks.

While Mazda is hard at work perfecting its HCCI technology in order to up the efficiency of internal combustion engines, GM could be looking at Delphi's Dynamic Skip Fire technology to replace the company's current Cylinder Deactivation fuel economy solution.

In conjunction with Silicon Valley-based Tula Technology, Delphi has created a system which manages engine output by continuously varying the number of cylinders firing depending on what the driver needs. For example, in a V8 application, DSF could shut down as many as six cylinders during steady state highway driving.

According to Delphi, the system "reduces fuel consumption by firing fewer cylinders at lower torque loads to reduce pumping and heat losses. It also reduces noise, vibration, and harshness by dynamically choosing firing sequences that avoid vehicle and driver resonance frequencies." It works by combining engine management software developed by Tula and mechanical components from Delphi.

Delphi is also hard at work on a 48V mild-hybrid system which the company says could and should be combined with DSF in order to replace the power and efficiency of diesel technology.

"You can spend $2,000 for the diesel system, with the appropriate after-treatment, or you can spend $1,500 and you can have a 48-volt mild hybrid with Dynamic Skip Fire," Delphi's vice president of engineering, Mary Gustanski, told Automotive News.

"When you do that, your CO2 performance is about equal, but you get enhanced performance."

Delphi says DSF would only cost automakers $350 per vehicle to implement when it launches in 2020, but there could be additional hidden costs as the technology would require modification of an engine's oil passages, which could necessitate a complete redesign of the cylinder heads.