| 摘要 |
A six stroke high thermal efficiency engine and a method for operating such an engine are disclosed. Oxygen or oxygen-enriched air is used as the oxidizer, heat is recovered from the two exhaust strokes, superheated steam is used in the second power stroke, and high levels of exhaust gas from stroke four are recirculated. Lean burn combustion is utilized to produce an oxygen rich exhaust which results in very low levels of particulates, unburned hydrocarbons, and carbon monoxide. Due to high thermal efficiency, carbon dioxide emissions are reduced per unit of power output. Use of oxygen or oxygen-enriched air as the oxidizer produces an exhaust containing very low levels of nitrogen oxides. The engine is insulated to conserve heat, resulting in reduced engine noise. An engine with high thermal efficiency, quiet operation, and low emissions is the result. |
| 主权项 |
1. A six stroke internal combustion engine comprising:
(a) At least one combustion chamber bounded by a cylinder, a cylinder head, and a piston reciprocally connected to a crankshaft through a connecting rod, (b) a recirculated exhaust intake valve connected to a recirculated exhaust gas conduit, where the recirculated exhaust intake valve is configured for allowing exhaust gas to be recirculated to the combustion chamber, (c) an oxidizer injection valve connected to an oxidizer accumulator through an oxidizer conduit, where the oxidizer injection valve is configured for controlling the flow of oxidizer composed of greater than 80% to less than 98% oxygen by volume entering the combustion chamber, (d) a fuel injection valve connected to a fuel conduit, where the fuel injection valve is configured for controlling the flow of fuel entering the combustion chamber, (e) a means for igniting a mixture of fuel and oxidizer composed of greater than 80% to less than 98% oxygen by volume is provided within the combustion chamber proximate top dead center within the combustion chamber, (f) a combustion exhaust valve connecting the combustion chamber with a steam super heater exchanger through a combustion exhaust conduit, (g) a superheated steam valve connected to a superheated steam conduit, where the superheated steam valve is configured for controlling the flow of superheated steam to the combustion chamber from the steam super heater exchanger, (h) a steam exhaust valve connecting the combustion chamber with a heat recovery heat exchanger through a steam exhaust conduit, where the steam exhaust valve is configured for controlling the flow of steam exhaust from the combustion chamber, and (i) a heat recovery system configured for generating superheated steam for return to the combustion chamber through the superheated steam conduit and generating cooled combustion exhaust gas for return to the combustion chamber through the recirculated exhaust gas conduit. |
