Method of model-based multivariable control of EGR and boost for internal combustion engines
AssigneeGM Global Technology Operations LLC
InventorsYue-Yun Wang, Ibrahim Haskara, Donald Terry French
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Abstract
A method to control an exhaust gas recirculation and a manifold air pressure in an engine includes utilizing a decoupling matrix within a multiple input and multiple output controller to determine an exhaust gas recirculation command and a manifold air pressure command, wherein the decoupling matrix is configured based upon a diagonally dominant model of the engine compensated by the determined exhaust gas recirculation command and the manifold air pressure command. The exhaust gas recirculation and manifold air pressure are controlled based upon the determined exhaust gas recirculation command and the determined manifold air pressure command.
Claims15
Method to control an exhaust gas recirculation and a manifold air pressure in an engine, the method comprising:
- monitoring parameters describing a desired engine state;
- determining an uncorrected exhaust gas recirculation command and an uncorrected manifold air pressure command based on the monitored parameters;
- utilizing a feed forward module to generate a feed forward exhaust gas recirculation command and a feed forward manifold air pressure command based upon the uncorrected exhaust gas recirculation command and the uncorrected manifold air pressure command;
- determining an exhaust gas recirculation error term from a comparison of the uncorrected exhaust gas recirculation command and an exhaust gas recirculation feedback term;
- determining a manifold air pressure error term from a comparison of the uncorrected manifold air pressure command with a manifold air pressure feedback term;
- utilizing a decoupling matrix within a multiple input and multiple output (MIMO) controller to determine a MIMO exhaust gas recirculation command and a MIMO manifold air pressure command, said decoupling matrix configured based upon a diagonally dominant model of the engine compensated by the exhaust gas recirculation error term and the manifold air pressure error term;
- generating an exhaust gas recirculation command based on combining the MIMO exhaust gas recirculation command with the feed forward exhaust gas recirculation command, wherein the feed forward exhaust gas recirculation command bypasses the MIMO controller;
- generating a manifold air pressure command based upon combining the MIMO manifold air pressure command with the feed forward manifold air pressure command, wherein the feed forward manifold air pressure command bypasses the MIMO controller;
- controlling the exhaust gas recirculation and the manifold air pressure based upon the determined exhaust gas recirculation command and the determined manifold air pressure command.
Method to control an air handling system for an engine comprising an exhaust gas recirculation system controllably delivering exhaust gas recirculation to the engine and a charging device controllably affecting a manifold air pressure, the method comprising:
- monitoring uncorrected parameters describing a desired engine state;
- determining a feed forward exhaust gas recirculation command based upon the uncorrected monitored parameters;
- determining a feed forward manifold air pressure command based upon the uncorrected monitored parameters;
- within a multiple input and multiple output (MIMO) controller, determining a MIMO exhaust gas recirculation command based upon the monitored uncorrected parameters and a decoupling matrix;
- within the MIMO controller, determining a MIMO manifold air pressure command based upon the monitored uncorrected parameters and the decoupling matrix;
- comparing the MIMO exhaust gas recirculation command with the feed forward exhaust gas circulation command to determine a corrected exhaust gas recirculation command;
- comparing the MIMO manifold air pressure command with the feed forward manifold air pressure command to determine a corrected manifold air pressure command;
- controlling the air handling system based upon the corrected exhaust gas recirculation and the manifold air pressure commands;
- wherein the decoupling matrix is configured based upon a diagonally dominant model of the engine compensated by the determined exhaust gas recirculation command and the manifold air pressure command.
Method to control exhaust gas recirculation system and a variable geometry turbocharger in an engine, the method comprising:
- determining a decoupling matrix for the engine through system identification, comprising:
- identifying a plurality of operating points throughout an operating range of the engine defined by engine speed and engine load;
- at each operating point, monitoring an engine speed;
- at each operating point, monitoring a boost ratio;
- at each operating point, identifying a static gain describing an uncompensated model of the engine;
- at each operating point, identifying a data point for the decoupling matrix based upon an inverse of the uncompensated model of the engine;
- for each operating point, determining a feed forward exhaust gas recirculation command based upon uncorrected monitored parameters describing a desired engine state;
- for each operating point, determining a feed forward manifold air pressure command based upon the uncorrected monitored parameters describing the desired engine state;
- within a multiple input and multiple output (MIMO) controller, determining a MIMO exhaust gas recirculation command based upon the monitored uncorrected parameters and a decoupling matrix;
- within the MIMO controller, determining a MIMO manifold air pressure command based upon the monitored uncorrected parameters and the decoupling matrix;
- comparing the MIMO exhaust gas recirculation command with the feed forward exhaust gas circulation command to determine a corrected exhaust gas recirculation command;
- comparing the MIMO manifold air pressure command with the feed forward manifold air pressure command to determine a corrected manifold air pressure command;
- and
- controlling the exhaust gas recirculation system and variable geometry turbocharger based upon the corrected exhaust gas recirculation and the manifold air pressure commands.
Dependencies are inferred from the claim text.