A compact fuel injection system designed specifically for small engines such as those in motorcycles and mopeds could cut emissions in half while being up to 70 cheaper than existing technologies.
The PicoSpray system, currently under development at U-M as part of TechArb, aims to dramatically reduce emissions while increasing the fuel efficiency of small engines in response to the growing problem of emissions created by small, low-cost vehicles around the world.
The system is meant to replace the carburetor in a small engine, which is the current system of delivering fuel to the engine.
“The carburetor is really old technology and it’s bad at delivering fuel, which means that it’s poor on fuel economy and pollutes a lot,” says Lihang Nong, a recent graduate of the Department of Mechanical Engineering and inventor of PicoSpray. “The fuel injection system makes the engine cleaner, run more efficiently and more reliable.”
While fuel injection technology is not new — it’s been installed on most passenger vehicles since the late 1980s — current fuel injection technology is not suitable for small engines. It involves numerous mechanical and electrical components and can raise the price of a small engine significantly.
“A typical motorcycle in Asia only costs about $500. So adding fuel injection to a motorcycle is just not feasible because it’s too costly,” says Nong, who says he “flipped the design on its head” to rethink how fuel injectors work.
A standard fuel injection system is built of three mechanical components: the injector, a pump and a regulator. In addition, there are many wires and sensors attached to different parts of the engine, which are then fed into a computer that controls everything. The PicoSpray product has been designed to simplify and condense that, reducing the number of components and packaging them into one box that can directly replace the carburetor.
“Our fuel injection system is a lot simpler and cheaper than a traditional one,” Nong says. “You literally just take the carburetor off the engine and bolt ours on — all the sensors and wires are installed in the unit.”
Nong plans to sell his product to small engine manufacturers, and hopes that upcoming changes in emissions regulations worldwide will help spur its success. He also sees a market in North America for manufacturers of utility engines such as lawnmowers and generators.
“In the past, the main driving factor in getting fuel injection installed in small engines was a competitive advantage for manufacturers,” Nong says. “In the future, within the next two years in fact, most of the countries in the world are going to start implementing stringent emissions standards, and that’s going to be the driving factor in the success of our product.”
The inspiration for PicoSpray came while Nong was visiting family in Beijing, where he was born. During one of his visits back to the region, he was struck by the amount of pollution being generated by the abundant use of single-passenger vehicles.
“In southeast Asia, in every intersection there are traffic jams of motorcycles. When you get to the street, you can just smell all the emissions. That had a pretty big impact on me,” Nong says.
He set out to solve the problem while pursuing his master’s degree in mechanical engineering at U-M. Working with other engineering students, he began to develop his product for use in the U-M Supermileage team’s competition car, which aimed to achieve 3,300 miles to the gallon in the 2012 SAE International Supermileage Challenge. The team didn’t reach their goal, but PicoSpray took off.
Nong is receiving help from U-M’s TechArb, a venture accelerator for students, and Ann Arbor SPARK. He also won $25,000 for a second-place finish in the 2011 Michigan Clean Energy Venture Challenge. Using those funds, and more resources provided to him by the College of Engineering’s Wilson Center, Nong and a handful of undergraduate engineering students are designing, machining and testing the product from scratch.
“It’s a lot harder for a hardware start-up to get working,” Nong says. “To actually design something, build it and test it you need materials, machines and testing equipment and it’s a lot more capital intensive than, say, a software startup. U-M has provided us with these resources, and I’m pretty thankful for that.”
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