Variable displacement engine operation with NVH management
First Claim
1. A system for operating a multiple cylinder internal combustion engine, the system comprising:
- a first mode wherein a device for closely coupling the engine to a drive train such that the drive train components generate a rotational inertia reaction torque in a direction opposite rotational inertia reaction torque generated by the engine to reduce transmission of vibration associated with combusting air-fuel mixtures in all cylinders of the engine;
a second mode wherein the device for closely coupling the engine to the drive train generates a rotational inertia reaction torque in a direction opposite rotational inertia reaction torque generated by the engine to reduce transmission of vibration associated with operating the engine in a reduced displacement mode; and
a controller to alternate operation between the first mode and the second mode in response to operating conditions.
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Accused Products
Abstract
A system and method for controlling an internal combustion engine operable with a first cylinder firing frequency and a second cylinder firing frequency to reduce or eliminate transmission of torsional vibrations associated with the second cylinder firing frequency to reduce or eliminate constraints on reduced displacement mode operation using a closely coupled drive train component rotating in an opposite direction relative to rotating components of the engine. A close coupling device allows the inertia of the counter-rotating elements to reduce or eliminate the torque reaction of the drivetrain associated with acceleration and deceleration of the engine crankshaft in response to the second cylinder firing frequency in the reduced displacement mode.
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Citations
20 Claims
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1. A system for operating a multiple cylinder internal combustion engine, the system comprising:
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a first mode wherein a device for closely coupling the engine to a drive train such that the drive train components generate a rotational inertia reaction torque in a direction opposite rotational inertia reaction torque generated by the engine to reduce transmission of vibration associated with combusting air-fuel mixtures in all cylinders of the engine; a second mode wherein the device for closely coupling the engine to the drive train generates a rotational inertia reaction torque in a direction opposite rotational inertia reaction torque generated by the engine to reduce transmission of vibration associated with operating the engine in a reduced displacement mode; and a controller to alternate operation between the first mode and the second mode in response to operating conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for reducing vibration associated with cylinder firing frequency when operating a multiple cylinder internal combustion engine in a reduced displacement mode with fewer than all cylinders combusting fuel, the system comprising:
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an engine controller in communication with the engine, the engine controller operating the engine in a first mode having a first cylinder firing frequency, and a second mode having a second cylinder firing frequency with at least one of the cylinders deactivated; a transmission having an input component; and a device for substantially non-compliantly coupling an output component of the engine to the input component of the transmission so that the input component rotates in a direction opposite to the output component of the engine and to reduce torsional vibration associated with the second cylinder firing frequency while operating in the reduced displacement mode. - View Dependent Claims (10)
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11. A method for controlling a multi-cylinder internal combustion engine operable in at least one reduced displacement mode with fewer than all of the cylinders combusting fuel, the method comprising:
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operating the engine with a first number of cylinders at a first cylinder firing frequency; deactivating at least one cylinder to operate in a reduced displacement mode at a second cylinder firing frequency; and rotating at least one closely-coupled drive train component in a direction opposite to rotating inertia created by operation of the engine to reduce torsional vibrations associated with the second cylinder firing frequency while operating in the reduced displacement mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification