Control system for an internal combustion engine operating with multiple combustion modes
First Claim
1. A method of controlling a turbocharged diesel engine, capable of multiple combustion modes, such as conventional diesel combustion and at least one alternate combustion mode in which the intake manifold pressure may fall below atmospheric pressure, comprising:
- using a supervisory controller to track an intake manifold pressure value;
defining a switching pressure as being substantially the same as atmospheric pressure;
defining a switching surface value as a function of engine operating conditions;
comparing the intake manifold pressure to the switching pressure value less the switching surface thickness value; and
adjusting the turbocharger output in response to the comparing step.
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Abstract
A method of controlling a diesel engine that is capable of multiple combustion modes and equipped with a turbocharger and EGR loop. The control method avoids a singularity condition inherent in turbocharged diesel engine having multiple combustion modes. For different combustion modes, different system states, control variables, and actuators are carefully chosen for different controllers based on the characteristics of the corresponding combustion mode as well as sensor and measurement limitations.
31 Citations
17 Claims
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1. A method of controlling a turbocharged diesel engine, capable of multiple combustion modes, such as conventional diesel combustion and at least one alternate combustion mode in which the intake manifold pressure may fall below atmospheric pressure, comprising:
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using a supervisory controller to track an intake manifold pressure value; defining a switching pressure as being substantially the same as atmospheric pressure; defining a switching surface value as a function of engine operating conditions; comparing the intake manifold pressure to the switching pressure value less the switching surface thickness value; and adjusting the turbocharger output in response to the comparing step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling a diesel engine, capable of multiple combustion modes, such as conventional diesel combustion and at least one alternate combustion mode, the engine having a turbocharger and an exhaust gas recirculation (EGR) loop, comprising:
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defining a system state for each combustion mode; defining system output variables for each combustion mode; defining actuators for each combustion mode; wherein the output variables and actuators are based on the characteristics of the associated combustion mode; and wherein one of the system states is a conventional combustion mode state, having output variables of intake manifold pressure, the fresh air flow rate through the compressor of the turbocharger, and the exhaust manifold pressure, and having actuators of a high pressure throttle between the compressor and the intake manifold, an EGR throttle, and a variable output turbocharger. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification