Method of controlling an engine with an EGR system
AssigneeDetroit Diesel Corporation
InventorsSteve Miller Weisman, II, Admir Kreso, Andrew May
Life of this patent
Estimating the term…
Abstract
A method of controlling an internal combustion engine includes determining an exhaust gas recirculation (EGR) command signal based on at least one engine condition, and determining a variable geometry turbocharger (VGT) command signal based on at least one engine condition and at least partially based on the EGR command signal. Advantageously, the EGR system and VGT system may be continuously and simultaneously controlled, taking into account the effects of each system on the other, to provide improved and more precise control over engine air flow. In an alternative embodiment, an engine may be controlled with a feedback control system where engine intake chemical composition is the feedback variable.
Claims24
A method of controlling an internal combustion engine, the engine including a variable geometry turbocharger (VGT) driven in response to a VGT command signal, the engine further including a variable flow exhaust gas recirculation (EGR) system driven in response to an EGR command signal to recirculate exhaust to an engine intake mixture, the method comprising:
- determining the EGR command signal based on at least one engine condition;
- determining a desired oxygen quantity of the intake mixture;
- estimating an actual oxygen quantity of the intake mixture;
- determining an engine torque demand;
- determining an engine speed;
- determining a feedforward term based on the torque demand and the engine speed;
- and
- determining the VGT command signal based on the desired oxygen quantity, the estimated actual oxygen quantity, the EGR command signal, and the feedforward term.
A method of controlling an internal combustion engine, the engine including a variable geometry turbocharger (VGT) driven in response to a VGT command signal, the engine further including a variable flow exhaust gas recirculation (EGR) system driven in response to an EGR command signal to recirculate exhaust to an engine intake mixture, the method comprising:
- determining a desired carbon dioxide quantity of the intake mixture;
- estimating an actual carbon dioxide quantity of the intake mixture;
- comparing the desired carbon dioxide quantity to the estimated actual carbon dioxide quantity to determine an error signal;
- determining the EGR command signal based on the error signal;
- and
- determining the VGT command signal based on at least one engine condition and at least partially based on the EGR command signal.
A method of controlling an internal combustion engine, the engine including a variable geometry turbocharger (VGT) driven in response to a VGT command signal, the engine further including a variable flow exhaust gas recirculation (EGR) system driven in response to an EGR command signal to recirculate exhaust to an engine intake mixture, the method comprising:
- determining the EGR command signal based on at least one engine condition;
- determining a lead compensated signal based on the EGR command signal;
- determining a desired oxygen quantity of the intake mixture;
- estimating an actual oxygen quantity of the intake mixture;
- determining a feedforward term based on at least one engine condition;
- and
- determining the VGT command signal based on the desired oxygen quantity, the estimated actual oxygen quantity, the EGR command signal, the lead compensated signal, and the feedforward term.
A method of controlling an internal combustion engine, the engine including a variable flow exhaust gas recirculation (EGR) system driven in response to an EGR command signal to recirculate exhaust to an engine intake mixture, the method comprising:
- determining a desired engine intake mixture composition composed of a plurality of different components;
- estimating an actual engine intake mixture composition;
- comparing the desired engine intake mixture composition to the estimated actual engine intake mixture composition;
- and
- controlling the engine based on the comparison such that the actual engine intake mixture composition tracks the desired engine intake mixture composition.
A computer readable storage medium having instructions stored thereon that are executable by a controller to perform a method of controlling an internal combustion engine, the engine including a variable geometry turbocharger (VGT) driven in response to a VGT command signal, the engine further including a variable flow exhaust gas recirculation (EGR) system driven in response to an EGR command signal to recirculate exhaust to an engine intake mixture, the medium further comprising:
- instructions for determining a desired carbon dioxide quantity of the intake mixture;
- instructions for estimating an actual carbon dioxide quantity of the intake mixture;
- instructions for comparing the desired carbon dioxide quantity to the actual carbon dioxide quantity to determine an error signal;
- instructions for determining the EGR command signal based on the error signal;
- and
- instructions for determining the VGT command signal based on at least one engine condition and at least partially based on the EGR command signal.
Dependencies are inferred from the claim text.