This would be wasteful to do but it has occurred to me as means to provide rather high torque at a standstill or just at speeds too slow for normal operation.
1. Flood the cylinder with a pressurized fuel/air mix any time after top dead center.
2. Close the intake valve.
3. Ignite the mixture.
4. continue this (perhaps at a rate of several times per second) until the piston has no more useful travel (close to bottom dead center). On a multi-cylinder motor there'll be another one on the outward stroke ready to take over.
This is accomplished by first allowing the exhaust valve to be open at the same time as the intake valve is and long enough to vent out old gasses then closing the exhaust valve and allowing time for the cylinder to pressurize.
Done correctly, I think that this possibility can be a means to eliminate the need for a clutch and transmission in some cases thus offsetting the downsides of complexity and inefficiencies that come with it.
A cam belongs here consistant with a Lullen-cycle motor. I chose to use a crankshaft arrangement here for what I think makes for an easier visualization of what is taking place in this situation.
© 2010 - 2011 by Walter E. Parrish. All Rights Reserved