COMBUSTION ENGINE SYSTEM

The control device in the internal combustion engine system stabilizes pressure control by limiting flow rate and incorporating anti-windup processing, addressing responsiveness and stability issues in conventional systems.

DE112023006676T5Pending Publication Date: 2026-06-18ASTEMO LTD
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-25
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Conventional internal combustion engine systems face issues with responsiveness and stability of pressure control due to sudden changes in pressure setpoints and deviations, leading to potential pressure oscillations.

Method used

The system employs a control device that calculates a target flow rate for the high-pressure fuel pump based on pressure deviation and its rate of change, limits the flow rate control value, and incorporates anti-windup processing to stabilize pressure control, using a combination of integral and proportional gains to adjust the flow rate setpoint.

Benefits of technology

This approach enhances the responsiveness and stability of pressure control by preventing overshoot and oscillations, ensuring stable fuel pressure delivery to the internal combustion engine.

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Abstract

An internal combustion engine system is provided that is capable of improving the responsiveness and stability of the control system with respect to the downstream pressure of a high-pressure fuel pump. A control unit of the internal combustion engine system calculates a target flow rate for the high-pressure fuel pump based on a pressure deviation between a target fuel pressure and a pressure sensor reading, calculates a limit flow rate based on the pressure deviation and its rate of change, selects a lower flow rate control value from the target flow rate and limit flow rate values, and controls an open / close valve of the high-pressure fuel pump according to the flow rate control value.The control device calculates the setting value by multiplying the reciprocal of the proportional gain by the difference between the flow rate setpoint and the flow rate control value, limits the setting value by the limiting value, calculates the pressure deviation setting value by subtracting the limited setting value from the pressure deviation, and calculates the flow rate setpoint by adding an integral term obtained by integrating the pressure deviation setting value and multiplying the integral value by an integral gain and a proportional term obtained by multiplying the pressure deviation and the proportional gain.
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Citation Information

Patent Citations

  • Controller of internal combustion engine

    JP2007032322A