CYLINDER CHARGE TEMPERATURE CONTROL FOR AN INTERNAL COMBUSTION ENGINE
1 Assignment
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Accused Products
Abstract
A method of operating an engine is provided. The engine includes operating a cylinder with net exhaust flow from the exhaust manifold, through the cylinder, to the intake manifold. Concurrently, another cylinder may operate to carry out combustion with net flow from the intake to the exhaust. In this way, exhaust in the intake manifold may be adjusted by varying valve operation of the first cylinder.
51 Citations
40 Claims
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1-20. -20. (canceled)
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21. A method for an engine having an intake and exhaust manifold, comprising:
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operating valves in a first cylinder to provide net gas flow from the exhaust to the intake manifold without combustion, while operating a second cylinder with combustion; and adjusting opening and closing timings of the valves to change torque pulsation timings from a first stroke to a second stroke of a 4-stroke-cycle and to change a number of torque pulsations in the 4-stroke-cycle. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A method of operating an engine including at least one cylinder communicating with an intake manifold via an intake manifold valve and an exhaust manifold via an exhaust manifold valve, the cylinder including a piston arranged within the cylinder, wherein the piston is coupled to a crankshaft of the engine, the method comprising:
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discontinuing combustion in the cylinder during a plurality of cycles of the engine; during said plurality of cycles, operating the exhaust manifold valve and the intake manifold valve to provide a net flow of gases from the exhaust manifold to the intake manifold via the cylinder and adjusting a torque signature provided to the crankshaft during each cycle by the piston responsive to an operating condition, wherein the torque signature produced during a cycle of said plurality of cycles includes net zero torque over the cycle. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for engine cylinders having intake and exhaust manifolds, comprising:
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operating valves in first and second cylinders to provide net gas flow from the exhaust to the intake via the first cylinder and from the intake to the exhaust via the second cylinder, the cylinders not combusting; and adjusting valve opening and closing timings to change a timing of torque pulsations from a first to a second stroke of a 4-stroke-cycle with net zero torque. - View Dependent Claims (39, 40)
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Specification