Combustion injection and control method for rotary valve engine

Patent metadata

Field	Value
Publication number	US-12460563-B2
Application number	US-202519248574-A
Country	US
Kind code	B2
Filing date	Jun 25, 2025
Priority date	Apr 30, 2024
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A independent rotary valve engine and a method for controlling thereof includes an engine crankcase, a crankshaft located therein, a bidirectional servo motor connected to the engine crankcase, a cylinder block connected to the engine crankcase, and a cylinder head connected to the cylinder block, with a spark plug and a piston linked by a connecting rod to the crankshaft. An intake rotary valve is located within a first channel in the cylinder head, and an exhaust rotary valve is located within a parallel second channel. A pulley connects a servo motor shaft of the bidirectional servo motor to the intake rotary valve. An engine control device, operatively connected to the spark plug and the bidirectional servo motor, generates spark timing signals, receives an engine speed requirement, determines a wide-open throttle position and intake valve closing angle, and generates variable valve timing signals to rotate the servo motor shaft.

First claim

The invention claimed is:

1 . A combustion injection and control method for an independent rotary valve engine, comprising:
installing an intake rotary valve into a first channel of a cylinder head; installing an exhaust rotary valve into a second channel in the cylinder head, wherein the second channel is parallel to the first channel; connecting a bidirectional servo motor on an engine crankcase; connecting a pulley to a servo motor shaft of the bidirectional servo motor and a first end of an inner shaft of the intake rotary valve; connecting, by a sprocket and chain mechanism, a crankshaft located in a bore in the engine crankcase to an outer sleeve of the intake rotary valve and to the exhaust valve; connecting, by a connecting rod, a piston located within a combustion chamber of a cylinder block to the crankshaft; generating, by an engine control unit operatively connected to the spark plug and the servo motor, spark timing signals; injecting, with a fuel injector, a fuel mixture in the combustion chamber; combusting, with a spark plug located within the cylinder head and operatively connected to the combustion chamber, the fuel mixture in the combustion chamber, receiving, by the engine control unit, an engine speed requirement; determining, by the engine control unit, a wide-open throttle position and an intake valve closing angle based on the engine speed requirement, and generating, by the engine control unit, variable valve timing signals; receiving, by the servo motor, the variable valve timing signals; and rotating, by the servo motor, the servo motor shaft in one of a clockwise direction and a counterclockwise direction based on the variable valve timing signals.

2 . The method of claim 1 , further comprising:
rotating, by the sprocket and chain mechanism connected to the crankshaft, the exhaust rotary valve to one of: a position in which an exhaust rotary valve port is over an opening to the combustion chamber after the combustion of the fuel mixture in the combustion chamber and releasing an exhaust gas to an exhaust manifold, and a position in which the exhaust rotary valve port is not over the opening to the combustion chamber when an intake rotary valve port is open to the combustion chamber.

3 . The method of claim 2 , further comprising:
receiving, from an intake manifold connected to the inner shaft of the intake rotary valve and the fuel injector, the fuel mixture; rotating, by the pulley, the inner shaft of the intake rotary valve to the position in which the intake rotary valve port is open to the combustion chamber; and rotating, by the pulley, the inner shaft of the intake rotary valve to a position in which the intake rotary valve port is not open to the combustion chamber after injecting the fuel mixture into the combustion chamber.

4 . The method of claim 3 , further comprising:
rotating, based on the intake valve timing signals, the bidirectional servo motor shaft to turn the pulley; and rotating, by the pulley, the inner intake rotary valve port to one of a fully open position, a partially open position, an idling position and a fully closed position based on the wide-open throttle position and the intake valve closing angle.

5 . The method of claim 3 , further comprising:
installing a first inner intake rotary valve shaft bearing between the pulley and a first end of the inner intake rotary valve shaft; rotatably connecting, by a first outer sleeve bearing installed near the first inner intake rotary valve shaft bearing, the first inner intake rotary valve shaft to the outer sleeve; preventing loss of the fuel mixture from the first end of the intake rotary valve by installing a first intake rotary valve seal between the first inner intake rotary valve shaft bearing and the first outer sleeve bearing; preventing loss of the fuel mixture between the inner intake rotary valve port and the outer sleeve, by installing a second intake rotary valve seal between the first outer sleeve bearing and the intake rotary valve port; installing a second inner intake rotary valve shaft bearing on the second end to rotatably connect the second end of the inner intake rotary valve shaft to a connection pipe of the intake manifold; installing a second outer sleeve bearing between the intake rotary valve port and the second inner intake rotary valve shaft bearing; preventing loss of the fuel mixture between the second end of inner intake rotary valve shaft and the outer sleeve by installing a third intake rotary valve seal between the second inner intake rotary valve shaft bearing and the second outer sleeve bearing; and preventing loss of the fuel mixture from the intake rotary valve port to the outer sleeve by installing a fourth intake rotary valve seal adjacent to the second outer sleeve bearing.

6 . The method of claim 5 , further comprising:
installing a first exhaust rotary valve bearing adjacent the sealing cap of the exhaust rotary valve; preventing backflow of the exhaust towards the first end by installing a first exhaust rotary valve seal on the exhaust rotary valve between the first exhaust rotary valve bearing and the exhaust rotary valve port; rotatably connecting the second end of the exhaust rotary valve to a connection pipe of the exhaust manifold by installing a second exhaust rotary valve bearing on the second end of the exhaust rotary valve; and preventing loss of the exhaust from the second exhaust rotary valve bearing by installing a second exhaust rotary seal located adjacent to the second exhaust rotary valve bearing between the second exhaust rotary valve bearing and the exhaust rotary valve port.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Khan Sikandar
• Fayyaz
• Javed Hassan
• Waqas Muhammad
• Jazim Agha Muhammad

Classifications

• F01L1/34

  characterised by the provision of means for changing the timing of the valves without changing the duration of opening {and without affecting the magnitude of the valve lift} · CPC title

• F01L1/024 Primary

  Belt drive · CPC title

• F01L7/021

  with one rotary valve · CPC title

• F01L7/026 Primary

  with two or more rotary valves, their rotational axes being parallel, e.g. 4-stroke · CPC title