Method and device for operating an internal combustion engine
First Claim
1. A method for operating an internal combustion engine which has at least one cylinder with a combustion chamber, the at least one cylinder driving a dual-mass flywheel in rotation, the method comprising:
- injecting fuel into the at least one cylinder;
receiving a measurement signal of a rotational speed of the internal combustion engine, the measurement signal of the rotational speed defining a series of increases and decreases in the rotational speed;
determining, based on the series of increases and decreases in the rotational speed, a local maximum value and a corresponding local minimum value of a rotational speed of the internal combustion engine;
determining a rotational speed difference between the local maximum value and the local minimum value of the rotational speed;
comparing the rotational speed difference to a resonance vibration frequency associated with the dual-mass flywheel; and
controlling a supply of fuel to the at least one cylinder based on the comparison of the rotational speed difference and the resonance vibration frequency.
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Accused Products
Abstract
In a method and a device for operating an internal combustion engine, with at least one cylinder (Z1-Z4) having a combustion chamber (26), fuel is injected into the cylinder and a logic value (LV_FCUT) is set, in particular for stopping the injection of fuel into the cylinder, The method furthermore has the following steps: depending on a course of the highly time-resolved measurement signal of a rotational speed (N_FAST) of the internal combustion engine, a local maximum value (N_FAST_MAX) of the rotational speed is determined, a rotational speed difference (N_FAST_DIF) between the local maximum value (N_FAST_MAX) and a current measured value (N_FAST_MES) of the rotational speed is determined, and, depending on the determined rotational speed difference (N_FAST_DIF), the logic value (LV_FCUT) is set.
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Citations
7 Claims
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1. A method for operating an internal combustion engine which has at least one cylinder with a combustion chamber, the at least one cylinder driving a dual-mass flywheel in rotation, the method comprising:
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injecting fuel into the at least one cylinder; receiving a measurement signal of a rotational speed of the internal combustion engine, the measurement signal of the rotational speed defining a series of increases and decreases in the rotational speed; determining, based on the series of increases and decreases in the rotational speed, a local maximum value and a corresponding local minimum value of a rotational speed of the internal combustion engine; determining a rotational speed difference between the local maximum value and the local minimum value of the rotational speed; comparing the rotational speed difference to a resonance vibration frequency associated with the dual-mass flywheel; and controlling a supply of fuel to the at least one cylinder based on the comparison of the rotational speed difference and the resonance vibration frequency. - View Dependent Claims (2, 3)
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4. A controller for operating an internal combustion engine having at least one cylinder with a combustion chamber into which fuel is injected, the at least one cylinder driving a dual-mass flywheel in rotation, wherein the controller is configured to:
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receive a measurement signal of a rotational speed of the internal combustion engine, the measurement signal of the rotational speed defining a series of increases and decreases in the rotational speed; determine, based on the series of increases and decreases in the rotational speed, a local maximum value and a corresponding local minimum value of a rotational speed of the internal combustion engine; determine a rotational speed difference between the local maximum value and the local minimum value of the rotational speed; compare the rotational speed difference to a resonance vibration frequency associated with the dual-mass flywheel; and control a supply of fuel to the at least one cylinder based on the comparison of the rotational speed difference and the resonance vibration frequency. - View Dependent Claims (5)
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6. An internal combustion engine, comprising:
- at least one cylinder having a combustion chamber into which fuel is injected;
the at least one cylinder driving a dual-mass flywheel in rotation; and a controller configured to; receive a measurement signal of a rotational speed of the internal combustion engine, the measurement signal of the rotational speed defining a series of increases and decreases in the rotational speed; determine, based on the series of increases and decreases in the rotational speed, a local maximum value and a corresponding local minimum value of a rotational speed of the internal combustion engine; determine a rotational speed difference between the local maximum value and the local minimum value of the rotational speed; compare the rotational speed difference to a resonance vibration frequency associated with the dual-mass flywheel; and control a supply of fuel to the at least one cylinder based on the comparison of the rotational speed difference and the resonance vibration frequency. - View Dependent Claims (7)
- at least one cylinder having a combustion chamber into which fuel is injected;
Specification