REDUCING NOISE, VIBRATION, AND HARSHNESS IN A VARIABLE DISPLACEMENT ENGINE
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Abstract
A method for operating an engine of a vehicle, the engine having one or more deactivatable cylinders, the method including controlling the stability of a vehicle in response to vehicle acceleration, and reactivating or deactivating combustion in at least a cylinder in response to vehicle acceleration.
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Citations
35 Claims
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1-20. -20. (canceled)
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21. A vehicle control method, comprising:
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controlling vehicle operation to increase a vehicle stability in response to a lateral vehicle acceleration and a steering angle sensor; and reactivating and deactivating combustion in a cylinder of an engine in the vehicle in response to the lateral vehicle acceleration. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for a vehicle including an engine, the engine having one or more deactivatable cylinders, comprising:
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a vehicle lateral acceleration sensor coupled to the vehicle; a wheel speed sensor coupled to a wheel of the vehicle; a wheel brake mechanism coupled to the wheel of the vehicle; and a control system for adjusting the wheel brake mechanism in response to the vehicle lateral acceleration sensor and a steering angle to improve the stability of the vehicle during traveling conditions of the vehicle, the control system further filtering the vehicle lateral acceleration sensor to pass frequencies around a firing frequency of the engine, and reactivating one or more deactivated cylinders of the engine in response to whether a magnitude of the lateral acceleration at the passed frequencies is greater than a threshold magnitude, the threshold adjusted in response to a rough road indication, the rough road indication based on the wheel speed sensor. - View Dependent Claims (32, 33, 34)
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35. A system for a vehicle, comprising:
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a variable displacement engine configured to deactivate a plurality of cylinders of the engine by disabling fuel injection and/or holding intake and exhaust valves closed for at least a cycle of the engine; a vehicle lateral acceleration sensor coupled in the vehicle; a wheel speed sensor coupled to a wheel of the vehicle; a wheel brake mechanism coupled to the wheel of the vehicle; and a control system for adjusting the wheel brake mechanism in response to the vehicle lateral acceleration sensor and an intended course indicated by a steering angle to improve the stability of the vehicle during traveling conditions of the vehicle, the control system including a band-pass filter configured to filter the vehicle lateral acceleration sensor to pass frequencies at firing frequency of the engine, the control system further reactivating the plurality of deactivated cylinders of the engine when a magnitude of the lateral acceleration at the passed frequencies is greater than a threshold magnitude, the threshold magnitude adjusted in response to a rough road indication, the rough road indication based on the wheel speed sensor.
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Specification