New engine system boosts efficiency, cuts emissions

Wednesday, March 21, 2018

Researchers at Waterloo Engineering have developed technology to reliably and affordably increase the efficiency of internal combustion engines by more than 10 per cent.

The product of a decade of research, the patented system for opening and closing valves could significantly reduce fuel consumption in everything from ocean-going ships to compact cars.

Amir Khajepour, right, in his lab at Waterloo Engineering.

Mechanical and mechatronics professor Amir Khajepour, right, discusses a project in his vehicle lab at Waterloo Engineering.

“This method has the potential to bring the well-established benefits of a fully variable valve system out of the lab and into production engines because cost and complexity aren’t issues,” said Amir Khajepour, a professor of mechanical and mechatronics engineering at Waterloo.

Intake and exhaust valves in internal combustion engines are typically controlled by cam mechanisms that do not allow the timing of their opening and closing to be varied.

The technology developed by Waterloo Engineering researchers replaces cams with hydraulic cylinders and rotary hydraulic valves that enable fully variable timing as the speed and torque of an engine change.

That ability to specifically time the opening and closing of valves according to engine operation is a key to increasing fuel efficiency, reducing both costs and greenhouse gas emissions.

A view of the valve system developed by researchers at Waterloo Engineering to improve engine efficiecny.

A view of the valve system developed by researchers at the Mechatronic Vehicle Systems Lab to improve engine efficiency.

“If you think about an ideal solution, it is to make the motion of the valve completely controllable,” said Khajepour, a Canada Research Chair and director of the Mechatronic Vehicle Systems Lab. “That gives you infinite options to work with.”

Although other systems to vary valve timing already exist, they are limited to use in experimental engines in laboratories due to their high cost and complexity.

The technology developed and tested at Waterloo is much simpler and far less expensive, paving the way for its use in engines for power generation, mining vehicles, the trucking industry and a host of other applications, including the consumer automotive market.

Khajepour said an affordable, reliable method to vary valve timing in internal combustion engines could substantially reduce our carbon footprint during the transition to cleaner electric powertrains over the next few decades.

“We should be able to easily improve efficiency by over 10 per cent, which is significant,” he said.

A study on optimizing the hydraulic variable valve system, which builds on research that began in 2008, appears in the journal Mechatronics

The other contributors to the paper were Mohammad Pournazeri, a former PhD student, and post-doctoral researcher Yanjun Huang.

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