ENGINE TORQUE CONTROL WITH FUEL MASS
First Claim
1. An engine assembly comprising:
- an internal combustion engine including an engine block having at least one cylinder, at least one piston moveable within the at least one cylinder;
an intake manifold and an exhaust manifold, each fluidly connected to the at least one cylinder and defining an intake manifold pressure (pi) and exhaust manifold pressure (pe), respectively;
a controller operatively connected to the internal combustion engine and configured to receive a torque request (TR);
wherein the controller is programmed to determine a desired fuel mass (mf) for controlling a torque output of the internal combustion engine, the desired fuel mass (mf) being based at least partially on the torque request (TR), the intake manifold pressure (pi), the exhaust manifold pressure (pe) and a log-scaled pressure-volume (PV) diagram of the at least one cylinder.
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Accused Products
Abstract
An engine assembly includes an internal combustion engine with an engine block having at least one cylinder. An intake manifold and an exhaust manifold are each fluidly connected to the at least one cylinder and define an intake manifold pressure (pi) and an exhaust manifold pressure (pe), respectively. A controller is operatively connected to the internal combustion engine and configured to receive a torque request (TR). The controller is programmed to determine a desired fuel mass (mf) for controlling a torque output of the internal combustion engine. The desired fuel mass (mf) is based at least partially on the torque request (TR), the intake and exhaust manifold pressures and a pressure-volume (PV) diagram of the at least one cylinder.
25 Citations
18 Claims
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1. An engine assembly comprising:
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an internal combustion engine including an engine block having at least one cylinder, at least one piston moveable within the at least one cylinder; an intake manifold and an exhaust manifold, each fluidly connected to the at least one cylinder and defining an intake manifold pressure (pi) and exhaust manifold pressure (pe), respectively; a controller operatively connected to the internal combustion engine and configured to receive a torque request (TR); wherein the controller is programmed to determine a desired fuel mass (mf) for controlling a torque output of the internal combustion engine, the desired fuel mass (mf) being based at least partially on the torque request (TR), the intake manifold pressure (pi), the exhaust manifold pressure (pe) and a log-scaled pressure-volume (PV) diagram of the at least one cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling torque output in an engine assembly with a desired fuel mass (mf), the engine assembly including an internal combustion engine having an engine block with at least one cylinder, at least one piston moveable within the at least one cylinder;
- at least one intake valve and at least one exhaust valve each in fluid communication with the at least one cylinder and having respective open and closed positions, and a controller configured to receive a torque request (TR), the method comprising;
obtaining a first function (F1), via the controller, as a sum of respective geometrical areas of a plurality of geometrical shapes in a pressure-volume (PV) diagram such that (F1=AR+AT1+AT2); wherein AR is an area of a rectangle in the log-scaled pressure versus volume (PV) diagram of the at least one cylinder; and wherein AT1 and AT2 are respective areas of a first and a second triangle in the log-scaled pressure versus volume (PV) diagram. - View Dependent Claims (12, 13, 14, 15, 16, 17)
- at least one intake valve and at least one exhaust valve each in fluid communication with the at least one cylinder and having respective open and closed positions, and a controller configured to receive a torque request (TR), the method comprising;
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18. A method for controlling torque output in a vehicle with a desired fuel mass (mf), the vehicle including an internal combustion engine having an engine block with at least one cylinder, at least one piston moveable within the at least one cylinder;
- at least one intake valve and at least one exhaust valve each in fluid communication with the at least one cylinder and having respective open and closed positions, and a controller configured to receive a torque request (TR), the method comprising;
obtaining a first function (F1), via the controller, as a sum of respective geometrical areas of a plurality of geometrical shapes in a log-scaled pressure-volume (PV) diagram of the at least one cylinder; obtaining a second function (F2), via the controller, as a sum of the first function (F1) and a product of the torque request (TR) and pi (π
) such that F2=F1+(TR*π
);obtaining a third function (F3), via the controller, based at least partially on a cylinder clearance volume (Vc), a second cylinder volume (VEVO) when the exhaust valve is in an open position and a predefined first constant (γ
) such that F3=[1−
(VEVO/VC)1-γ
]; andobtaining the desired fuel mass (mf) for controlling the torque output of the vehicle, via the controller, based at least partially on the second function (F2), the third function (F3), a predefined second constant (η
) and a predefined third constant (QLHV) such that mf=F2/(F3*η
*QLHV).
- at least one intake valve and at least one exhaust valve each in fluid communication with the at least one cylinder and having respective open and closed positions, and a controller configured to receive a torque request (TR), the method comprising;
Specification