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US 2006/0124086 A1Published application
Controlled auto-ignition two-stroke engine
OwnerJuana Fabregainventor
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OwnerJuana Fabregainventor
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A controlled auto-ignition or spark ignition two stroke piston engine, fed by homogeneous air-fuel mixture, with crankcase scavenging, in which the amount of air-fuel mixture transferred from the crankcase to the cylinder is not greater than the 50% of the cylinder volume; said engine has reed valves in the transfer ports that connect the crankcase to the cylinder to control the internal dynamics of the air-fuel mixture, limiting the instantaneous maximum flow that is transferred to the cylinder in order to achieve the best stratification level among the air-fuel mixture and the exhaust residual gases, getting this way the thermo chemical activation of part of the fuel contained in the mixture. Said engine also has a rotary valve adjacent to the cylinder exhaust port that rotates in synchronism with the crankshaft, which closes the exhaust port a few degrees after the piston reaches the bottom dead center, thus preventing the leakage of the thermo chemically activated mixture and holding part of the burnt gases inside the cylinder. Then, during the compression stroke, more heat is given to the thermo chemically activated mixture decomposing part of the fuel contained in it into activated radicals which act as igniters when close to the top dead center firing the mixture in a simultaneous and complete way, thus obtaining very low levels of CO, HC and Nox emissions, as well as low fuel and oil consumption.
A controlled auto-ignition or spark ignition two-stroke piston engine, having a reed valve between the crankcase and the carburetor, fed with homogeneous mixture, by means of carburetor or fuel injector, with crankcase scavenging, in which the air-fuel mixture transferred from the crankcase to the cylinder during the scavenging stroke is 50% maximum of the cylinder volume, characterized by having at least one reed valve in each one of the transfer ports that connect the crankcase to the cylinder and a rotary valve that rotates in synchronism with the crankshaft at a 1 to 1 ratio, or integral to it, which is adjacent to the cylinder exhaust port/s and closes said port/s during the upward movement of the piston a few degrees after it reaches the bottom dead center and before it closes the intake ports.
A two stroke piston engine as in claims I and 2, characterized by having any mechanism as long as it modifies the homogeneous mixture air/gasoline ratio, enriching it or making it poorer according to the changes in the engine charge and revolutions per minute conditions in order to control the engine power output and the moment in which the mixture auto-ignition begins during the compression stroke, advancing or delaying it in relationship to the top dead center.
A control system of the fluid internal dynamics for auto-ignition or spark ignition two stroke piston engines, with crankcase scavenging, having al least one exhaust port and at least one transfer port between the crankcase and the cylinder, characterized by having at least one reed valve in the transfer ports between the intake port/s and the crankcase to control the flow and pressure among them and to prevent the fluid from being drawn back to the crankcase.
An exhaust system for controlled auto-ignition or spark ignition two stroke piston engines, which are fed by homogeneous mixture and have crankcase scavenging and exhaust port/s, with the characteristic of having two chambers connected by a hole and by reed valves which are moved by the difference of pressure among both chambers, which enable the fluid to flow in only one way, being this towards the cylinder this way enlarging the exhaust gases passage area to the cylinder making their withdrawal to be easier to achieve.
Dependencies are inferred from the claim text.