Jim Miller was trying to make cars go faster,
“That’s the nature of innovation. You start down one path, and you end up down another avenue that you
In 2011, Dayco launched Miller’s group as an in-house startup focused on expanding product offerings. The 112-year-old parts supplier focuses on belts and powertrain components, but corporate leaders saw the need for advanced actuation systems and created the team to explore technologies in that arena. One of the group’s first projects was a valve to manage turbocharger airflow.
Ford engineers saw the technology and had a different thought – brakes.
Boosting brake performance
When Ford put the 3.5L EcoBoost V-6 engine in the F-150 in 2010, it made a huge bet that truck buyers would be willing to choose a turbocharged V-6 instead of a naturally aspirated V-8 in its most popular vehicle. The market response was huge, and in the years since launch, the twin-turbo engine has become the truck’s most popular engine option.
However, downsizing and boosting creates some engineering challenges. Shrinking the engine means creating less vacuum to power secondary systems. Each system that draws engine power creates a parasitic loss to the vehicle, so the more load that can be removed from the engine, the lower the likelihood of the truck activating its turbochargers, and the higher the fuel efficiency.
For the second-generation 3.5L EcoBoost launched in the 2017 F-150, Ford engineers wanted to get rid of another source of parasitic loss – the brake system’s mechanical vacuum pump.
Paul DiLisio, vice president of program and product management, says downsizing engines forces companies to power brake systems by “adding either a parasitic mechanical vacuum pump or a costly electric vacuum pump to supply enough vacuum to the brake booster. Our system allows you to eliminate the vacuum pump, which will help either cost or improve efficiency.”
“We take a portion of the air naturally coming into the engine and flow it through an aspirator,” Miller explains. “The Venturi effect creates a low-pressure zone at the throat of the device, and we connect that low-pressure zone to the brake-boost canister.”
The low pressure in the aspirator pulls air from the brake-boost canister, supplying more vacuum to the braking system than the engine alone could provide in certain conditions – amplifying engine vacuum. When the brake-boost canister has sufficient vacuum to fully apply the brakes, a signal to the engine control system redirects engine air away from the
Miller adds that the system generates enough vacuum from natural engine airflow to eliminate the need for mechanical or electrical boost systems. It’s also lighter, less expensive, offers more vacuum than pumps, and has fewer moving parts.
“We solve a lot of problems without creating new ones,” Miller says. “We check a lot of boxes – lower weight, higher efficiency, eliminating auxiliary pumps, and we improve brake performance.”
While the target application had been powertrain, Ford engineers saw the potential vacuum that could be produced and adapted Dayco’s technology for the brake system. So even though Dayco’s team developed the basic technology, the first application was based on Ford’s interpretation of that work.
“They came to us with the concept of the system, and they outlined the valve and aspirator that would be needed to make the system work, and we developed those components,” Miller says.
Going from concept to finished product required new skills. Dayco’s long history in auto industry supply wasn’t much help. Working with vacuums is very different than working with belts, Miller says.
“We’re not considering airflow when we’re developing belts. So, we had to develop new expertise to work on this project,” Miller says. “Before it was a physical model, we did quite a bit of computational fluid dynamics (CFD). We went through thousands of iterations of the design, optimizing it through computer modeling before we moved forward to physical models with 3D printing.”
Additive manufacturing allowed Dayco to produce several versions of
DiLisio says while it has been great for the technology’s first application to be in the best-selling vehicle in the United States, he hopes to apply Activac to the powertrain systems for which it was designed.
“Lots of vehicle systems need