Map-scheduled gains for closed-loop control of fuel injection pressure
First Claim
1. An internal combustion engine comprising:
- a fuel system that applies injection control pressure (ICP) to fuel injectors to force fuel into combustion chambers; and
a control system for setting ICP in accordance with data developed by a processor of the control system wherein, the control system comprises a map that provides a schedule that correlates data values of closed-loop gain with data values for certain operating conditions, and the processor comprises a control strategy a) for processing data values of various parameters to develop a data value representing a desired ICP set-point, b) for processing the desired ICP set-point data value and a data value representing actual ICP to develop an ICP error data value for closed-loop control of actual ICP, c) for selecting a data value of closed-loop gain from the map based on the data values of certain operating conditions obtained from measurements of those operating conditions, d) for processing both the selected data value of closed-loop gain and the ICP error data value to create a data value for a closed-loop output, and e) and for using the data value for the closed-loop output to create a data value for a final output for forcing actual ICP to the desired ICP set-point.
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Accused Products
Abstract
A schedule (164, 166) correlates data values of closed-loop gain (KP, KI) with engine temperature values (EOT) and engine speed values (N). A control strategy develops a data value (ICPC_DES) representing desired injector control pressure (ICP) set-point, processes ICPC_DES and a data value (ICP_MPA) representing actual ICP to develop ICP error data value (ICP_ERR) for closed-loop P-I control (160, 162) of actual ICP. Data values for closed-loop proportional and integral gains are obtained from the schedule based on measured engine temperature and measured engine speed. ICP become less subject to undesirable fluctuations that might otherwise change fuel injection quantity in ways detrimental to attainment of desired tailpipe emission objectives.
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Citations
23 Claims
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1. An internal combustion engine comprising:
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a fuel system that applies injection control pressure (ICP) to fuel injectors to force fuel into combustion chambers; and
a control system for setting ICP in accordance with data developed by a processor of the control system wherein, the control system comprises a map that provides a schedule that correlates data values of closed-loop gain with data values for certain operating conditions, and the processor comprises a control strategy a) for processing data values of various parameters to develop a data value representing a desired ICP set-point, b) for processing the desired ICP set-point data value and a data value representing actual ICP to develop an ICP error data value for closed-loop control of actual ICP, c) for selecting a data value of closed-loop gain from the map based on the data values of certain operating conditions obtained from measurements of those operating conditions, d) for processing both the selected data value of closed-loop gain and the ICP error data value to create a data value for a closed-loop output, and e) and for using the data value for the closed-loop output to create a data value for a final output for forcing actual ICP to the desired ICP set-point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for control of injection control pressure (ICP) that is used to force the injection of fuel into an engine combustion chamber comprising:
a processor a) for processing data values of various parameters to develop a data value representing a desired ICP set-point, b) for processing the desired ICP set-point data value and a data value representing actual ICP to develop an ICP error data value for closed-loop control of actual ICP, c) for selecting, from a map that provides a schedule that correlates data values of closed-loop gain with data values for certain operating conditions, a data value of closed-loop gain based on the data values for those operating conditions, d) for processing both the selected data value of closed-loop gain and the ICP error data value to create a data value for a closed-loop output, and e) and for using the data value for the closed-loop output to create a data value for a final output for forcing actual ICP to the desired ICP set-point. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for control of injection control pressure (ICP) that is used to force the injection of fuel into an engine combustion chamber comprising:
a) processing data values of various parameters to develop a data value representing a desired ICP set-point, b) processing the desired ICP set-point data value and a data value representing actual ICP to develop an ICP error data value for closed-loop control of actual ICP, c) selecting, from a map that provides a schedule that correlates data values of closed-loop gain with data values for certain operating conditions, a data value of closed-loop gain based on the data values for those certain operating conditions, d) processing both the selected data value of closed-loop gain and the ICP error data value to create a data value for a closed-loop output, and e) and using the data value for the closed-loop output to create a data value for a final output for forcing actual ICP to the desired ICP set-point. - View Dependent Claims (18, 19, 20, 21, 22, 23)
Specification