High Efficiency rotary piston combustion engine

• US 20040244765A1
• Filed: 06/06/2003
• Published: 12/09/2004
• Est. Priority Date: 06/06/2003
• Status: Active Grant

• Current Assignee: Brent Warren Elmer
• Original Assignee: Brent Warren Elmer
• Inventors: Elmer, Brent Warren
• Granted Patent: US 6,978,758 B2
• Time in Patent Office: Days
• US Class Current: 123/244
• CPC Class Codes: F01C 1/3446 the inner and outer member being in contact along more than one line or surface
• CPC Class Codes: F01C 11/002 of similar working principle

Abstract

A computer controlled rotary piston engine includes a blower housing containing a rotatable impeller assembly, for pushing ambient air into the housing, and forcing the air to pass through a normally open valve mechanism into a combustion chamber. A plurality of fuel injectors are selectively operable for injecting fuel into the combustion chamber, followed by selective operation of at least one spark plug for igniting the fuel/air mixture, thereby causing the valve mechanism to close, and the combustion gases to pass through a plurality of spaced apart intake manifolds into always open intake ports of a piston chamber for rotating a vaned or bladed rotary piston therein, followed by spent combustion gases being forced out of a plurality of spaced always open exhaust ports into an exhaust manifold. The distance the piston travels during a power cycle is adjustable, and inversely proportional to the frequency of combustion or number of combustion cycles within a given period of time.

Claims

1. A rotary piston combustion engine including at least one engine module comprising:

a drive shaft;

a fan including;

a fan housing, said drive shaft being at least partially contained within said fan housing an opening in a front portion of said fan housing permitting air to be drawn therein;

a plurality of spaced apart fan blades rotationally mounted within said fan housing; and

means for rotating said plurality of spaced apart fan blades;

a combustion chamber connected at one end to said fan housing, said drive shaft being mounted for rotationally passing through said combustion chamber;

valve means located between said fan housing and said combustion chamber, for permitting air to flow from said fan housing into said piston chamber, whenever the air pressure in said fan housing is greater than that in said combustion chamber, and for sealing off said combustion chamber from said fan housing, whenever the combustion gas pressure in said combustion chamber is greater than the air pressure in said fan housing;

a piston chamber connected at one end to another end of said combustion chamber, said piston chamber including;

a radially directed convoluted interior wall surface providing a cam track for the length of said chamber;

a plurality of equally spaced apart intake ports successively arrange around the circumference of said piston chamber; and

a plurality of equally spaced apart exhaust ports successively arranged around the circumference of said piston chamber inbetween each successive two of said plurality of intake ports, respectively;

a cylindrical piston rigidly mounted on said drive shaft within said piston chamber, said cylindrical piston including a plurality of spaced apart slots radially oriented and penetrating equally into the circumferential surface of said piston;

a plurality of spring biased vanes partially retained in respective ones of said plurality of slots of said piston, whereby as said piston rotates said vanes follow the contours of the cam track of said piston chamber, causing each of said vanes to reciprocate between extreme extended and retracted positions in rotating between successive exhaust and input ports, a vane being fully extended between successive input and output ports, and fully retracted between successive output and input ports;

a plurality of intake manifolds connected between said plurality of intake ports of said piston chamber, respectively, and said combustion chamber, for conveying combustion gases, from said combustion chamber into said piston chamber;

at least one spark plug installed in a wall of said combustion chamber;

at least one fuel injector installed in a wall of said combustion chamber;

a shaft speed sensor mounted proximate said drive shaft, for providing electrical signals indicative of the rotational speed of said drive shaft, and the distance traveled by said piston during given measurement periods; and

computerized control means for operating said engine, said computerized control means being programmed for responding to signals from said shaft speed sensor, and to a speed or torque command signal requesting a desired drive shaft RPM or torque, for operating said at least one fuel injector and spark plug to run said engine as required.

2. The rotary piston engine of claim 1, wherein said means for rotating said plurality of spaced apart fan blades includes securing said fan blades to said drive shaft.

3. The rotary piston engine of claim 1, wherein said rotating means includes an electric motor connected to said plurality of fan blades.

4. The rotary piston engine of claim 1, further including:

an exhaust manifold ring;

a plurality of exhaust manifolds connected respectively between said plurality of exhaust ports and said exhaust manifold ring, for conveying exhaust gases from said plurality of exhaust ports into said exhaust manifold ring, respectively; and

an exhaust duct connected to said exhaust manifold ring, for exhausting gases therefrom into the atmosphere.

5. The rotary piston engine of claim 1, further including:

a guide shield mounted in said combustion chamber for directing combustion gases from said combustion chamber into said plurality of intake manifolds, respectively.

6. The rotary piston engine of claim 1, further including:

a guide shield rigidly attached to said drive shaft within said combustion chamber for rotation to both enhance mixing of injected fuel with air, and direct combustion gases from said combustion chamber into said plurality of intake manifolds.

7. The rotary piston engine of claim 1, further including:

a combustion pressure sensor mounted in said combustion chamber, for providing combustion pressure signals to said computerized control means;

a fan pressure sensor mounted in said fan housing, for providing fan pressure signals to said computerized control means; and

said computerized control means being further programmed to respond to said combustion pressure and fan pressure signals in controlling the operation of said engine.

8. The rotary piston engine of claim 7, further including:

a first temperature transducer mounted in said fan housing, for providing input air temperature signals to said computerized control means;

a second temperature transducer mounted in said combustion chamber, for providing combustion temperature signals to said computerized control means; and

said computerized control means being further programmed to respond to said input air and combustion temperature signals in controlling the operation of said engine.

9. The rotary piston engine of claim 1, further including:

at least one purge valve mounted through a wall of said combustion chamber;

said computerized control means being further programmed to operate said purge valve(s) between combustion cycles to purge gases from said combustion chamber, preparatory for a next combustion cycle to enhance high speed operation or high torque operation of said engine.

10. The rotary piston engine of claim 1, further including:

a pair of spaced apart countersunk holes in the bottom of each one of said plurality of slots, respectively, in said piston;

a plurality of springs each one of which is individually installed in the bottom portion of said countersunk holes in said plurality of slots, respectively; and

said plurality of spring biased vanes each having a top edge portion for sealing against and following said cam track, and a pair of spaced apart spring guide arms configured to slidably fit into associated one of said plurality of slots of said piston, said spring guide arms having bottom portions in constant contact with top portions of associated ones of said plurality of springs, for spring biasing said plurality of vanes in a manner permitting each vane to reciprocate in following said cam track as said piston rotates.

11. The rotary piston engine of claim 5, further including:

said guide shield being funnel shaped with a centrally located through hole in an otherwise closed relatively wide top portion through which said drive shaft passes, and having a relatively narrow bottom portion, the top portion being proximate to and opposing a portion of an outside wall of said piston chamber;

a first seal bearing through which said drive shaft rotatably passes, said first seal bearing being rigidly attached both via one facial portion to said valve means, and via an opposing facial portion to a bottom end of the narrow bottom portion of said guide shield; and

a second seal bearing through which said drive shaft rotatably passes, said second seal bearing being rigidly attached via one facial portion to a central portion of an outer wall of said piston chamber about a through hole thereof, and rigidly attached via a circumferential wall portion in the hole in the top of said guide shield, said guide being held stationary via said first and second seal bearings as said drive shaft rotates.

12. The rotary piston engine of claim 6, further including:

said guide shield being funnel shaped with a centrally located through hole in an otherwise closed relatively wide top portion through which said drive shaft passes and is rigidly attached, and having a relatively narrow bottom portion through which said drive shaft passes, and is rigidly secured thereto.

13. The rotary piston engine of claim 12, further including:

a first seal bearing having a central hole through which said drive shaft rotatably passes, said first seal bearing being rigidly mounted upon and with its central hole concentric with a centrally located hole in an interior wall of said piston chamber, for preventing the passing of combustion gases from said combustion chamber into said piston chamber.

14. The rotary piston engine of claim 13, further including:

said guide shield further including a partial countersunk hole in said top portion for enclosing a portion of said first seal bearing in a non-contacting manner, thereby permitting other portions of said top portion to be in close proximity to an opposing portion of an interior wall of said piston chamber.

15. The rotary piston engine of claim 1, further including

a plurality of datum marks permanently placed on said drive shaft;

and

said shaft speed sensor being positioned relative to said drive shaft for detecting the passage of said plurality of datum marks 5, respectively, for providing signals to said computerized control means for counting the number of datum marks detected over a given measuring period for determining the distance the piston travels during the measurement period relative to the termination of a combustion or power cycle, whereafter a new combustion or power cycle can be initiated.

16. The rotary piston of claim 1, wherein said valve means includes:

a valve plate rigidly connected between an open interior end portion of said fan housing, and an open end of said combustion chamber, said valve plate including a plurality of through holes for passing air from said fan housing into said combustion chamber; and

a shutter disk rigidly mounted in said combustion chamber proximate said valve plate, said shutter disk including a plurality of shutter flaps opposing each of said plurality of air passage holes in said valve plate, respectively, whereby whenever the air pressure in said combustion chamber exceeds the air pressure in said fan housing, said shutter flaps move in a manner to close off said plurality of air passage holes, thereby preventing the flow of air and combustion gases between said combustion chamber and fan housing, said plurality of shutter flaps being positioned away from said plurality of air passage holes at other times.

17. The rotary piston of claim 1, wherein said valve means includes

a cage valve plate rigidly connected between an open interior end of said fan housing, and an open end of said combustion chamber;

and

a plurality of cage ball valves arranged on said cage ball valve plate, operative for permitting the passage of air from said fan housing into said combustion chamber whenever the air pressure in said fan housing exceeds the pressure in said combustion chamber, and for blocking such passage of air and combustion gases therebetween whenever the combustion gas pressure in said combustion chamber exceeds the air pressure in said fan housing.

18. The rotary piston engine of claim 15, further including:

said plurality of spring biased vanes being sixteen in number, and equally spaced apart;

said plurality of intake ports being four in number;

said plurality of exhaust ports being four in number; and

said cam track including;

four equally spaced apart first lobes each bearing a relative maximum radial length from the center of said piston chamber midway between each successive intake port and exhaust port, at which points opposing ones of said plurality of spring biased vanes will be in their fully extended positions; and

four equally spaced apart second lobes inbetween said first lobes, said second lobes each having a relative minimum radial length from the center of said piston chamber midway between each successive exhaust port and intake port, at which point opposing ones of said plurality of spring biased vanes will be in their fully retracted positions.

19. The rotary piston engine of claim 1, wherein said computerized control means is further programmed to utilize templates of a look-up table for deriving from sensed signals necessary control signals to run said engine.

20. The rotary piston engine of claim 1, further including:

a plurality of said engine modules ganged together on a common drive shaft; and

each being controlled by a common computerized control means programmed to operate ganged array of engine modules.

21. The rotary piston engine of claim 19, wherein said computerized control means is further programmed to sense a malfunctioning engine module, and respond by terminating its operation while continuing operation of the other ones of said plurality of said engine modules.

22. A rotary piston engine comprising:

a drive shaft;

a fan enclosed within a fan housing;

a plurality of engine modules ganged together on said drive shaft;

a shaft speed sensor mounted proximate said drive shaft, for providing electrical signals indicative of the rotational speed of said drive shaft;

each one of said plurality of engine modules including;

a combustion chamber connected at one end to said fan housing, said drive shaft being mounted for rotationally passing through said combustion chamber;

valve means located between said fan housing and said combustion chamber, for permitting air to flow from said fan housing into said piston chamber, whenever the air pressure in said fan housing is greater than that in said combustion chamber, and for sealing off said combustion chamber from said fan housing, whenever the combustion gas pressure in said combustion chamber is greater than the air pressure in said fan housing;

a piston chamber connected at one end to another end of said combustion chamber, said piston chamber including;

a radially directed convoluted interior wall surface providing a cam track for the length of said chamber;

a plurality of equally spaced apart intake ports successively arrange around the circumference of said piston chamber; and

a plurality of equally spaced apart exhaust ports successively arranged around the circumference of said piston chamber inbetween each successive two of said plurality of intake ports, respectively;

a cylindrical piston rigidly mounted on said drive shaft within said piston chamber, said cylindrical piston including a plurality of spaced apart slots radially oriented and penetrating equally into the circumferential surface of said piston;

a plurality of spring biased vanes partially retained in respective ones of said plurality of slots of said piston, whereby as said piston rotates said vanes follow the contours of the cam track of said piston chamber, causing each of said vanes to reciprocate between extreme extended and retracted positions in rotating between successive exhaust and input ports, a vane being fully extended between successive input and output ports, and fully retracted between successive output and input ports;

a plurality of intake manifolds connected between said plurality of intake ports of said piston chamber, respectively, and said combustion chamber, for conveying combustion gases, from said combustion chamber into said piston chamber;

at least one spark plug installed in a wall of said combustion chamber;

at least one fuel injector installed in a wall of said combustion chamber;

a shaft speed sensor mounted proximate said drive shaft, for providing electrical signals indicative of the rotational speed of said drive shaft, and the distance traveled by said piston during given measurement periods; and

computerized control means for operating said engine, said computerized control means being programmed for responding to signals from said shaft speed sensor, and to a speed or torque command signal requesting a desired drive shaft RPM or torque, for operating said at least one fuel injector and spark plug of each one of said plurality of engine modules to run said engine as required.

23. The rotary piston engine of claim 22, wherein said computerized control means is further programmed to sense a malfunctioning engine module, and respond by terminating its operation while continuing operation of the other ones of said plurality of said engine modules.