Combined-cycle combustion control type three-cylinder engine and method for controlling the same
AssigneeHyundai Motor Company
InventorMin-Kyu Park
Life of this patent
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Abstract
A combined-cycle combustion control type three-cylinder engine includes: a cylinder block; and cylinders arranged in a row in the cylinder block and consisting of first, second, and third cylinders so that four-cycle combustion is performed in two of the first, second, and third cylinders and two-cycle combustion is performed in the remaining cylinder. A crankshaft is provided in first, second, and third pistons and converting reciprocating motions of the respective first, second, and third cylinders into rotational motions. A camshaft receives a rotational force from the crankshaft to control intake and exhaust timings for each of the first, second, and third cylinders.
Claims18
A combined-cycle combustion control type three-cylinder engine comprising:
- a cylinder block;
- cylinders arranged in a row in the cylinder block and consisting of first, second, and third cylinders so that four-cycle combustion is performed in two of the first, second, and third cylinders and two-cycle combustion is performed in the remaining cylinder;
- a crankshaft connected to first, second, and third pistons and rotating by reciprocating motions of the respective first, second, and third cylinders;
- and
- a camshaft receiving a rotational force from the crankshaft to control intake and exhaust timings for each of the first, second, and third cylinders,
- wherein the camshaft comprises two four-cycle cams for controlling the intake and exhaust timings of the first and third cylinders, and one two-cycle cam for controlling the intake and exhaust timings of the second cylinder;
- and
- the two-cycle cam has an elliptical shape and is bilaterally symmetrical about an axis of rotation of the camshaft.
A method for controlling a combined-cycle combustion control type three-cylinder engine, comprising:
- performing combined-cycle combustion consisting of four-cycle combustion performed in first and third cylinders of first, second, and third cylinders, and two-cycle combustion performed in the second cylinder, when an engine ECU recognizes ignition of the engine;
- and
- performing combined-cycle combustion control in which, when the engine ECU controls the four-cycle combustion in the first and third cylinders and the two-cycle combustion in the second cylinder, intake valve open (IVO) of the second cylinder is controlled before or after a piston of the first or third cylinder reaches a BDC, and intake valve close (IVC) of the second cylinder is controlled when the piston of the first or third cylinder reaches the BDC.
A method of controlling a combined-cycle combustion control type three-cylinder engine, comprising:
- performing combined-cycle combustion consisting of four-cycle combustion performed in first and third cylinders of first, second, and third cylinders, and two-cycle combustion performed in the second cylinder, when an engine ECU recognizes ignition of the engine;
- and
- performing combined-cycle combustion control in which, when the engine ECU controls the four-cycle combustion in the first and third cylinders and the two-cycle combustion in the second cylinder, IVO of the second cylinder is controlled when a piston of the first or third cylinder reaches a BDC, exhaust valve open (EVO) of the second cylinder is controlled after the control of the IVO, and IVC and exhaust valve close (EVC) of the second cylinder are simultaneously controlled before or after the piston of the first or third cylinder reaches the BDC.
A method of controlling a combined-cycle combustion control type three-cylinder engine, comprising:
- performing combined-cycle combustion consisting of four-cycle combustion performed in first and third cylinders of first, second, and third cylinders, and two-cycle combustion performed in the second cylinder, when an engine ECU recognizes ignition of the engine;
- performing two-cycle cylinder determination in which the engine ECU determines whether the second cylinder has a two-cycle cylinder exhaust valve;
- performing first type combined-cycle combustion control in which, when the engine ECU controls the four-cycle combustion in the first and third cylinders and the two-cycle combustion in the second cylinder without having the two-cycle cylinder exhaust valve, IVO of the second cylinder is controlled before or after a piston of the first or third cylinder reaches a BDC, and IVC of the second cylinder is controlled when the piston of the first or third cylinder reaches the BDC;
- and
- performing second type combined-cycle combustion control in which, when the engine ECU controls the four-cycle combustion in the first and third cylinders and the two-cycle combustion in the second cylinder having the two-cycle cylinder exhaust valve, IVO of the second cylinder is controlled when a piston of the first or third cylinder reaches a BDC, EVO of the second cylinder is controlled after the control of the IVO, and IVC and EVC of the second cylinder are simultaneously controlled before or after the piston of the first or third cylinder reaches the BDC.
Dependencies are inferred from the claim text.