Method for synchronizing cylinders in terms of quantities of fuel injected in an internal combustion engine
First Claim
1. A method for synchronizing, between the cylinders of an internal combustion engine, the differences in the quantity of fuel injected, comprising the steps of:
- determining the differences in the quantity of fuel injected which exist at a low operating point in the lower engine-speed range with the injection parameter values valid at that point under normal operating conditions by means of a method of measuring individual cylinders to record irregularities in the running of the internal combustion engine,assigning the differences to the low operating point,for operating ranges with higher loads and engine speeds, adapting the differences in the quantity of fuel injected for a chosen injection parameter,at the low operating point, setting the chosen injection parameter for adaptation to a value which deviates from the value applicable at that point under normal operating conditions,for the set value, determining the differences in the quantity of fuel injected by means of measurement of the irregularities in the running of the engine, andstoring the differences as adaptation values which are assigned to the respective injection parameter value, wherein during the adaptation the movement of the operating point, which changes with the injection parameter value set, respectively, is limited, wherein, in order to limit the movement of low operating point during adaptation, at least one second injection parameter is set such that the operating point remains at least approximately stationary.
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Accused Products
Abstract
In an adaptation (4, 5, 6, 7) of differences in injected quantities within high operating ranges, the differences are based on an injection parameter and are determined by regulating an irregular operation in an operating point within the lower operating ranges. The injection parameter which determines the differences in injected quantities in the lower operating point is set on a value different from the normal operating value in this point. The dynamics of the operating point varying with the corresponding parametric value of injection is limited during adaptation (4, 5, 6, 7).
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Citations
18 Claims
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1. A method for synchronizing, between the cylinders of an internal combustion engine, the differences in the quantity of fuel injected, comprising the steps of:
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determining the differences in the quantity of fuel injected which exist at a low operating point in the lower engine-speed range with the injection parameter values valid at that point under normal operating conditions by means of a method of measuring individual cylinders to record irregularities in the running of the internal combustion engine, assigning the differences to the low operating point, for operating ranges with higher loads and engine speeds, adapting the differences in the quantity of fuel injected for a chosen injection parameter, at the low operating point, setting the chosen injection parameter for adaptation to a value which deviates from the value applicable at that point under normal operating conditions, for the set value, determining the differences in the quantity of fuel injected by means of measurement of the irregularities in the running of the engine, and storing the differences as adaptation values which are assigned to the respective injection parameter value, wherein during the adaptation the movement of the operating point, which changes with the injection parameter value set, respectively, is limited, wherein, in order to limit the movement of low operating point during adaptation, at least one second injection parameter is set such that the operating point remains at least approximately stationary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for synchronizing, between the cylinders of an internal combustion engine, the differences in the quantity of fuel injected, comprising:
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measurement means for recording irregularities in the running of the internal combustion engine and for determining the differences in the quantity of fuel injected which exist at a low operating point in the lower engine-speed range with the injection parameter values valid at that point under normal operating conditions, means for assigning the differences to the low operating point, means for adapting the differences in the quantity of fuel injected for a chosen injection parameter, means for setting the chosen injection parameter for adaptation to a value which deviates from the value applicable at that point under normal operating conditions, and memory means for storing the differences in the quantity of fuel as adaptation values which are assigned to the respective injection parameter value, wherein during the adaptation the movement of the operating point, which changes with the injection parameter value set, respectively, is limited, wherein, in order to limit the movement of the low operating point during adaptation, at least one second injection parameter is set such that the operating point remains at least approximately stationary. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification