Short round
Well-known member
Smarter Plugs
The spark plug is an intrinsic part of the gasoline internal combustion engine. It has been around in its various iterations ever since the early gasoline engineers figured out that gasoline would not combust on its own and that they needed a spark timed to go off when the piston is at the correct position. The modern spark plug is a superbly evolved piece of hardware that can fire a mixture 5000 times a minute and go without any adjustments for a hundred thousand miles.
Mark Cherry wants to make it obsolete. Cherry runs a company called Automotive Resources in Idaho and has invented a spark plug replacement that he calls the 'smart plug.' The smart plug is intended as a bolt-on replacement for the spark plug and is designed to do things that the spark plug can never do. The smart plug is a self-contained catalytic ignition unit that can be retrofitted to just about any engine and burn a number of fuels.
The smart plug takes the catalytic process out of the tail pipe and into the engine. It is a lot like a model aircraft glow plug, which Cherry says was the original inspiration. It has a prechamber with a catalytic heating element. Screwed into the spark plug hole, the smart plug has a cylindrical chamber with a catalytic rod in the middle. The tip heats up and ignites the small fraction of the air/ fuel mixture that is in the cylindrical chamber. The mixture then explodes out of the smart plug and ignites the rest of the combustion chamber gas. The flames enable a far more complete combustion than is possible with a conventional spark plug.
One of the major advantages of using the smart plug is that it can eliminate the rest of the conventional ignition circuit. It does not require distributors, coils, or points. Eliminating these items cuts out the radio frequency interference that a normal system throws out. In aircraft usage, this capability alone would be a significant advantage. Initial start up requires about 6 W of electric current for the heating element to come up to operating temperature. But after the initial warm up, the smart plug is self-contained, requiring no electricity to continue functioning. The heat of the combustion stays in the smart plug and enables it to combust additional combustion cycles continuously.
The smart plug enables combustion of a variety of fuels including a mixture of ethanol and water. Water-based fuels are a spark plug's nightmare, but the smart plug has no problems with combusting a water-rich mixture. In the future, as we shift to renewable fuels, this might be a significant enabler. The smart plug also enables combustion of fuels, such as diesel and kerosene, in low-compression gasoline engines. The smart plug can also be retrofitted to existing diesel engines by replacing the injectors with smart plugs and using conventional gasoline injection hardware.
Smart plugs have been tested out on a reconditioned Lycoming O-200 engine with the aircraft taking off, flying, and landing entirely without spark plugs. It has also been tested on a variety of engines including various two strokes, four strokes, and rotaries using a number of fuels. The only constraint is that leaded gas contaminates the platinum catalyst in the smart plug (as it does for platinum in catalytic converters), leading to deteriorated performance as the contamination increases.
Mark Cherry and his team in Sandpoint, Idaho, are currently pursuing military applications where the multifuel capabilities provide relief to fuel supply logistics issues. With the entire military standardizing on diesel fuel, this technology enables the military to also run its gasoline generators on diesel fuel.
Details:
Mark Cherry
Automotive Resources Inc., Idaho.
Phone: 208-265-2723
E-mail: markc@smartplugs.com
URL: http://www.smartplugs.com
To comment on this article, write to us at tiresearch@frost.com
To find out more about Technical Insights and our Alerts, subscriptions and research services, access http://ti.frost.com
Vern
The spark plug is an intrinsic part of the gasoline internal combustion engine. It has been around in its various iterations ever since the early gasoline engineers figured out that gasoline would not combust on its own and that they needed a spark timed to go off when the piston is at the correct position. The modern spark plug is a superbly evolved piece of hardware that can fire a mixture 5000 times a minute and go without any adjustments for a hundred thousand miles.
Mark Cherry wants to make it obsolete. Cherry runs a company called Automotive Resources in Idaho and has invented a spark plug replacement that he calls the 'smart plug.' The smart plug is intended as a bolt-on replacement for the spark plug and is designed to do things that the spark plug can never do. The smart plug is a self-contained catalytic ignition unit that can be retrofitted to just about any engine and burn a number of fuels.
The smart plug takes the catalytic process out of the tail pipe and into the engine. It is a lot like a model aircraft glow plug, which Cherry says was the original inspiration. It has a prechamber with a catalytic heating element. Screwed into the spark plug hole, the smart plug has a cylindrical chamber with a catalytic rod in the middle. The tip heats up and ignites the small fraction of the air/ fuel mixture that is in the cylindrical chamber. The mixture then explodes out of the smart plug and ignites the rest of the combustion chamber gas. The flames enable a far more complete combustion than is possible with a conventional spark plug.
One of the major advantages of using the smart plug is that it can eliminate the rest of the conventional ignition circuit. It does not require distributors, coils, or points. Eliminating these items cuts out the radio frequency interference that a normal system throws out. In aircraft usage, this capability alone would be a significant advantage. Initial start up requires about 6 W of electric current for the heating element to come up to operating temperature. But after the initial warm up, the smart plug is self-contained, requiring no electricity to continue functioning. The heat of the combustion stays in the smart plug and enables it to combust additional combustion cycles continuously.
The smart plug enables combustion of a variety of fuels including a mixture of ethanol and water. Water-based fuels are a spark plug's nightmare, but the smart plug has no problems with combusting a water-rich mixture. In the future, as we shift to renewable fuels, this might be a significant enabler. The smart plug also enables combustion of fuels, such as diesel and kerosene, in low-compression gasoline engines. The smart plug can also be retrofitted to existing diesel engines by replacing the injectors with smart plugs and using conventional gasoline injection hardware.
Smart plugs have been tested out on a reconditioned Lycoming O-200 engine with the aircraft taking off, flying, and landing entirely without spark plugs. It has also been tested on a variety of engines including various two strokes, four strokes, and rotaries using a number of fuels. The only constraint is that leaded gas contaminates the platinum catalyst in the smart plug (as it does for platinum in catalytic converters), leading to deteriorated performance as the contamination increases.
Mark Cherry and his team in Sandpoint, Idaho, are currently pursuing military applications where the multifuel capabilities provide relief to fuel supply logistics issues. With the entire military standardizing on diesel fuel, this technology enables the military to also run its gasoline generators on diesel fuel.
Details:
Mark Cherry
Automotive Resources Inc., Idaho.
Phone: 208-265-2723
E-mail: markc@smartplugs.com
URL: http://www.smartplugs.com
To comment on this article, write to us at tiresearch@frost.com
To find out more about Technical Insights and our Alerts, subscriptions and research services, access http://ti.frost.com
Vern