Control device for regulating the exhaust gas recycling rate in an internal combustion engine with self-ignition
First Claim
1. A method of controlling a device for regulating the exhaust gas recycling rate in an internal combustion engine with self-ignition, the improvement comprising;
- detecting the combustion pressure in at least one cylinder of the engine and forming an actual-value number of occurrences which exceed a threshold value within a duration of a set time period of a timer;
generating a nominal value signal dependent on engine operating characteristics and forming a set-point number of times a threshold value is exceeded within a duration of a set time period of said timer; and
influencing an exhaust gas recirculation rate in accordance with the actual-value and set-point numbers.
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Accused Products
Abstract
A control device is proposed for regulating the exhaust gas recycling rate in an internal combustion engine with self-ignition in which combustion pressure signals are adjusted directly or indirectly to nominal values dependent on operating characteristics of the engine. In one particular embodiment the combustion pressure signal is differentiated and the frequency of certain occurring amplitude values is adjusted to a nominal value. Owing to the integration of specific combustion processes into the regulation, the device is capable of operating with relatively high precision. It is particularly well suited to compensate for drift phenomena.
16 Citations
12 Claims
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1. A method of controlling a device for regulating the exhaust gas recycling rate in an internal combustion engine with self-ignition, the improvement comprising;
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detecting the combustion pressure in at least one cylinder of the engine and forming an actual-value number of occurrences which exceed a threshold value within a duration of a set time period of a timer; generating a nominal value signal dependent on engine operating characteristics and forming a set-point number of times a threshold value is exceeded within a duration of a set time period of said timer; and influencing an exhaust gas recirculation rate in accordance with the actual-value and set-point numbers. - View Dependent Claims (2, 3)
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4. In a control device for regulatng an exhaust gas recycling rate in an internal combustion engine with self-ignition, the improvement comprising:
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means for detecting a combustion pressure in at least one cylinder of the engine within a duration of a set time period; means for forming an actual-value signal for each pressure occurrence which exceeds a threshold value within a set time period of a timer; means for generating a nominal value signal dependent on engine operating characteristics; means for forming set-point signals for a number of times a threshold value is exceeded within a duration of a set time period of a timer; and means for influencing an exhaust gas recirculation rate in accordance with a number of actual-value signals and a number of set-point signals occuring during said set time period. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification