System and method for reducing vehicle acceleration during engine transitions
First Claim
1. A method for controlling an engine having multiple cylinders, each with at least one electrically actuated valve, the engine operating in a first mode having a first number of firing cylinders and a second mode having a second number of firing cylinders, the method comprising:
- transitioning the engine from operating in the first mode to the second mode;
adjusting at least a valve timing or lift of one of a last cylinder to be fired in said first mode and a first cylinder to be fired in said second mode to temporarily adjust a cylinder torque and thereby reduce vehicle shuffle mode vibration.
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Accused Products
Abstract
A method for controlling an engine to reduce vehicle shuffle mode vibration during mode transition. The engine includes multiple cylinders, each with at least one electrically actuated valve, and the engine operates in a first mode having a first number of firing cylinders and a second mode having a second number of firing cylinders. The method comprises transitioning the engine from operating in the first mode to the second mode; adjusting at least a valve timing or lift of one of a last cylinder to be fired in said first mode and a first cylinder to be fired in said second mode to temporarily adjust a cylinder torque and thereby reduce vehicle shuffle mode vibration.
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Citations
23 Claims
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1. A method for controlling an engine having multiple cylinders, each with at least one electrically actuated valve, the engine operating in a first mode having a first number of firing cylinders and a second mode having a second number of firing cylinders, the method comprising:
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transitioning the engine from operating in the first mode to the second mode;
adjusting at least a valve timing or lift of one of a last cylinder to be fired in said first mode and a first cylinder to be fired in said second mode to temporarily adjust a cylinder torque and thereby reduce vehicle shuffle mode vibration. - View Dependent Claims (2, 3, 4, 5, 6, 17)
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7. A method for controlling an engine of a vehicle traveling on a road, the engine having multiple cylinders with electromechanical valve actuator and an operating mode being changed from a first mode having a first number of firing cylinders to a second mode having a second number of firing cylinders, the method for controlling output torque during a transition from the first mode to the second mode, comprising:
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adjusting the output torque of the last cylinder in the first mode;
adjusting the torque output of a preselected cylinder in the second mode to reduce a shuffle mode excitation and longitudinal acceleration of the vehicle. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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18. A method for controlling an engine having multiple cylinders, each with at least one electrically actuated valve, the engine operating in a first mode having a first number of firing cylinders and a second mode having a second number of firing cylinders greater than said first mode, the method comprising:
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when transitioning the engine from operating in the first mode to the second mode and maintaining average torque substantially constant;
operating a last cylinder in said first mode provide a reduced torque output relative to the average torque output;
operating a first cylinder in said second mode to be a firing cylinder with an increased torque relative to the average torque output; and
when transitioning the engine from operating in the second mode to the first mode and maintaining average torque substantially constant;
operating a last cylinder in said second mode to be a firing cylinder;
operating a first cylinder in said first mode to be a firing cylinder, where a torque output of said first cylinder in said first mode is reduced relative to the average torque output. - View Dependent Claims (19)
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20. A method for controlling an engine having multiple cylinders, each with at least one electrically actuated valve, the engine operating in a first mode having a first number of firing cylinders and a second mode having a second number of firing cylinders, the method comprising:
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transitioning the engine from operating in the first mode to the second mode;
adjusting an output torque of a last cylinder in said first mode; and
adjusting an output torque of a first cylinder in said second mode to temporarily adjust cylinder torques and thereby reduce vehicle shuffle mode vibration. - View Dependent Claims (21, 22, 23)
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Specification