METHODOLOGY FOR EXTENDING THE HIGH LOAD LIMIT OF HCCI OPERATION BY ADJUSTING INJECTION TIMING AND SPARK TIMING
First Claim
1. Method for controlling an internal combustion engine capable of operating in a homogeneous charge compression ignition mode, including extended operation in the homogeneous charge compression ignition mode at high loads by reducing occurrence of ringing within the engine, said method comprising:
- operating the engine in the homogeneous charge compression ignition mode including spark-assisted ignition;
monitoring an engine load;
monitoring an engine speed;
determining when the engine is in a high ringing range based upon the engine load and the engine speed; and
when the engine load is in the high ringing range, operating the engine in a reduced ringing mode, comprisingmodulating a fuel injection timing according to a calibrated maximum combustion chamber cooling fuel injection timing,determining a preferred combustion phasing value, andmodulating a spark timing based upon the modulated fuel injection timing and the preferred combustion phasing value.
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Accused Products
Abstract
A method for operating an internal combustion engine including extended operation in a homogeneous charge compression ignition mode at high loads includes operating the engine in the homogeneous charge compression ignition mode including spark-assisted ignition, monitoring an engine load, monitoring an engine speed, determining the engine to be in a high ringing range based upon the engine load and the engine speed, and when the engine load is in the high ringing range, operating the engine in a reduced ringing mode. The reduced ringing mode includes modulating a fuel injection timing according to a calibrated maximum combustion chamber cooling fuel injection timing, determining a preferred combustion phasing value, and modulating a spark timing based upon the modulated fuel injection timing and the preferred combustion phasing value.
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Citations
14 Claims
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1. Method for controlling an internal combustion engine capable of operating in a homogeneous charge compression ignition mode, including extended operation in the homogeneous charge compression ignition mode at high loads by reducing occurrence of ringing within the engine, said method comprising:
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operating the engine in the homogeneous charge compression ignition mode including spark-assisted ignition; monitoring an engine load; monitoring an engine speed; determining when the engine is in a high ringing range based upon the engine load and the engine speed; and when the engine load is in the high ringing range, operating the engine in a reduced ringing mode, comprising modulating a fuel injection timing according to a calibrated maximum combustion chamber cooling fuel injection timing, determining a preferred combustion phasing value, and modulating a spark timing based upon the modulated fuel injection timing and the preferred combustion phasing value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Method for controlling an internal combustion engine operable in a homogeneous charge compression ignition mode, including operation in a high ringing range, the method comprising:
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monitoring an engine speed; monitoring an engine load; monitoring a preferred combustion phasing value; determining a pre-assigned negative valve overlap based upon the engine speed and the engine load; determining a maximum combustion chamber cooling fuel injection timing based upon the engine load; determining a desired exhaust gas recirculation percentage based upon the maximum combustion chamber cooling fuel injection timing; determining a desired spark timing based upon balancing the preferred combustion phasing value and the maximum combustion chamber cooling fuel injection timing; and operating the engine based upon the desired spark timing. - View Dependent Claims (8)
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9. Internal combustion engine system, comprising:
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an internal combustion engine, configured for selective operation in a homogeneous charge compression ignition combustion mode; a control module configured to monitor engine operating states and control engine operation; and an engine control subsystem configured to control engine operation based upon the monitored engine operating states, comprising operating the engine in the homogeneous charge compression ignition mode including spark-assisted ignition, monitoring an engine load, monitoring an engine speed, determining the engine to be in a high ringing range based upon the engine load and the engine speed, and when the engine load is in the high ringing range, operating the engine in a reduced ringing mode comprising modulating a fuel injection timing according to a calibrated maximum combustion chamber cooling fuel injection timing, determining a preferred combustion phasing value, and modulating a spark timing based upon the modulated fuel injection timing and the preferred combustion phasing value. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification