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US 4,917,054 AGranted
Six-stroke internal combustion engine
OwnerGerhard B. Schmitzinventor
Life of this patent
Estimating the term…
Abstract
A six-stroke internal combustion engine with reciprocating pistons wherein the six strokes are the admission of air, the first compression accompanied or followed by a possible cooling, a second compression followed by a combustion, the first expansion producing a usable work, the second expansion producing also a usable work and finally the discharge of the combustion gases, this engine, whose combustion is either with spark-ignition (gasoline version) or with auto-ignition (diesel version), will include preferably a multiple of five non-uniform cylinders, and will have an energy efficiency of up to 30% higher than that of a four-stroke internal combustion engine.
Claims14
An internal combustion engine comprising
- at least one cylinder which includes one working chamber having a volume which is rendered variable by displacement inside the cylinder of a piston between a high dead point position and a low dead point position, under effect of pressure forces periodically produced inside said chamber;
- and
- valve means for admission and discharge of a gaseous fluid associated with said at least one cylinder, the piston and cylinder being connected to a crankshaft of the engine;
- wherein the engine comprises at least four cylinders disposed to form two pairs, one cylinder of each pair being a high pressure combustion cylinder and the other cylinder being adapted to work as a low pressure admission cylinder, the working chamber of each low pressure admission cylinder being adapted to communicate:
- (a) with an air intake manifold through at least one admission valve, for producing a precompression of admitted air;
- (b) with the working chamber of the combustion cylinder of the other pair via communication passageway means for discharging into this combustion cylinder the precompressed air, through at least one discharge valve associated with the admission cylinder and through at least one admission valve associated with the combustion cylinder for producing a compression and combustion at a high pressure of the air to which fuel has been added and a first expansion of combustion gases in said combustion cylinder;
- (c) with the working chamber of the associated combustion cylinder through at least one transfer valve for transferring the high pressure combustion gases produced in said associated combustion cylinder into the admission cylinder, to produce a second expansion;
- and
- (d) with a discharge manifold for the combustion gases which have undergone said second expansion, through at least one discharge valve,
- said valves being controlled such that the engine operates as a six-stroke internal combustion engine.
7 more elements
An internal combustion engine comprising
- at least one cylinder which includes a working chamber having a volume which is rendered variable by displacement inside the cylinder of a piston between a high dead point position and a low dead point position, under effect of pressure forces periodically produced inside said chamber;
- and
- valve means for admission and discharge of a gaseous fluid associated with said at least one cylinder, the piston being connected to a crankshaft of the engine;
- said engine comprising at least two cylinders disposed so as to form a pair, one cylinder being a high pressure combustion cylinder, and the other cylinder arranged to work as a low pressure admission cylinder,
- the working chamber of the low pressure admission cylinder being adapted to communicate with
- (a) an air intake manifold through at least one admission valve, for producing a precompression of admitted air;
- and
- (b) with a tank for discharging to said tank the precompressed air through at least one discharge valve associated with the admission cylinder;
- the working chamber of the combustion cylinder being adapted to communicate;
- (a) with said tank through at least one admission valve for the precompressed air to which fuel has been added, for compression and combustion of the admitted air to which the fuel has been added at a high pressure and a first expansion of combustion gases;
- and
- (b) with the working chamber of the low pressure cylinder through at least one transfer valve for transferring the high pressure combustion gases from the combustion cylinder into the admission cylinder to produce a second expansion;
- the low pressure cylinder being adapted to communicate with a discharge manifold for the combustion gases which have been subjected to said second expansion, through at least one discharge valve;
- said valves being controlled in such a manner that the engine operates as a six-stroke internal combustion engine.
11 more elements
Dependencies are inferred from the claim text.