Methods and systems for controlling imbalance with an exhaust tuning valve
AssigneeFord Global Technologies, LLC
InventorsSumanth Reddy Dadam, Hani Ayesh, Vinod Ravi, Di Zhu, Vivek Kumar
Life of this patent
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Abstract
Methods and systems are provided for controlling imbalance with an exhaust tuning valve. In one example, a method may include adjusting a first exhaust tuning valve in response to combustion torque imbalance in a first and second group of cylinders. Additionally or alternatively, the position of the second exhaust tuning valve may be adjusted in response to an imbalance generated by the same group of cylinders.
Claims18
A method for controlling a vehicle with an engine and an active exhaust tuning valve, comprising:
- generating exhaust from a first group of cylinders and a second group of cylinders, the exhaust delivered in a first exhaust passage and a second exhaust passage to a first tailpipe and a second tailpipe, respectively;
- and
- adjusting a first position of an exhaust tuning valve in the first exhaust passage to reduce an imbalance vibration generated by combustion torque imbalances between the first group of cylinders and the second group of cylinders, wherein adjusting the exhaust tuning valve is further based on a vehicle moving direction and a vibration dose value based on a root-mean-square vehicle acceleration.
A method for controlling a vehicle with an engine and an active exhaust tuning valve, comprising:
- generating exhaust from a first group of cylinders and a second group of cylinders, the exhaust delivered in a first exhaust passage and a second exhaust passage to a first tailpipe and a second tailpipe, respectively;
- and
- adjusting a first position of an exhaust tuning valve in the first exhaust passage differentially from a second position of an exhaust tuning valve in the second exhaust passage to reduce an imbalance vibration generated by combustion torque imbalances between the first group of cylinders and the second group of cylinders, including at a first imbalance vibration level, the first and second positions are open, at a second imbalance vibration level higher than the first imbalance vibration level, the first position is still open and the second position more closed, and at a third imbalance vibration level higher than the second imbalance vibration level, the first position and second position are more closed, wherein adjusting the exhaust tuning valve in the first exhaust passage is further responsive to a vehicle moving direction including forward and reverse.
A system, comprising:
- an engine with a first group of cylinders and a second group of cylinders,
- a first exhaust passage coupled to the first group of cylinders and a second exhaust passage coupled to the second group of cylinders, the first exhaust passage terminating at a first tailpipe and the second exhaust passage terminating at a second tailpipe;
- a first exhaust tuning valve in the first exhaust passage;
- a second exhaust tuning valve in the second exhaust passage;
- and
- a control for during a first condition, adjusting a first position of the first exhaust tuning valve differentially from a second position of the second exhaust tuning valve responsive to imbalance vibration generated by combustion torque imbalances between the first group of cylinders and the second group of cylinders, and during a second condition with less imbalance vibration, adjusting the first position and the second position to a common position.
Dependencies are inferred from the claim text.