Component vibration based cylinder deactivation control system and method
First Claim
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1. A method comprising:
- determining a vehicle vibration limit based upon at least one of a vehicle speed (KPH), a coolant temperature of the engine and a signal from a user actuated economy switch, wherein the vibration limit is increased by a correction factor based on the signal;
measuring a vehicle vibration level; and
modifying an active cylinder count based on the vehicle vibration limit and the vehicle vibration level;
wherein determining the vehicle vibration limit is based upon a signal from a user actuated economy switch, wherein the vibration limit is increased by a correction factor based on the signal.
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Abstract
A method of changing an active cylinder count of an engine may include determining a vehicle vibration limit and a vehicle vibration level. The cylinder count may be modified (increased or decreased) based upon the vehicle vibration limit and the vehicle vibration level. The vehicle vibration limit may be based upon a vehicle speed, and a coolant temperature of the engine. The vehicle vibration level may be based upon at least one of a desired torque of the engine and a number of active cylinders of the engine. According to other features, the vehicle vibration level may be based upon a measured vibration level of a vehicle component.
53 Citations
13 Claims
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1. A method comprising:
determining a vehicle vibration limit based upon at least one of a vehicle speed (KPH), a coolant temperature of the engine and a signal from a user actuated economy switch, wherein the vibration limit is increased by a correction factor based on the signal; measuring a vehicle vibration level; and modifying an active cylinder count based on the vehicle vibration limit and the vehicle vibration level; wherein determining the vehicle vibration limit is based upon a signal from a user actuated economy switch, wherein the vibration limit is increased by a correction factor based on the signal. - View Dependent Claims (2, 3, 4)
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5. A control module comprising:
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a vibration limit module that determines a vibration limit based upon a measured vehicle speed (KPH), a coolant temperature of an engine and an input from a user actuated economy switch; a vibration level module that determines a vibration level based upon a vibration signal from an accelerometer that measures a vibration level of a vehicle component; and a cylinder transition module that determines a desired activated cylinder count based upon the vibration limit and the vibration level and that modifies an activated cylinder count based on the desired activated cylinder count. - View Dependent Claims (6, 13)
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7. A control module comprising:
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a vibration limit module that determines a vibration limit based upon at least one of a measured vehicle speed (KPH), a coolant temperature of an engine and an input from a user actuated economy switch; a vibration level module that determines a vibration level based upon a measured vibration level of a vehicle component; and a cylinder transition module that determines a desired activated cylinder count based upon the vibration limit and the vibration level and that modifies an activated cylinder count based on the desired activated cylinder count. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification