US 10,208,699 B2Granted

Method and apparatus for controlling an internal combustion engine

AssigneeGM Global Technology Operations LLC

InventorsYiran Hu, Jun-mo Kang, Steven E. Muldoon, Chen-fang Chang

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Abstract

A direct-injection internal combustion engine is described and includes a pressure sensor that is disposed to monitor in-cylinder combustion pressure. A method, executed as a control routine in an attached controller, includes monitoring engine speed, engine load, temperature and combustion pressure. Combustion variation parameters are determined based upon the combustion pressure. A desired state for a combustion parameter can be determined based upon the engine speed, the engine load, and the temperature, and an adjustment to the desired state for the combustion parameter can be determined based upon the combustion variation parameters, wherein the adjustment to the desired state is selected to achieve acceptable states for the combustion variation parameters. Operation of the internal combustion engine is controlled based upon the desired state for the combustion parameter and the adjustment to the desired state for the combustion parameter.

Claims17

Dependent claims

A method for controlling operation of a direct-injection internal combustion engine, wherein the internal combustion engine includes a pressure sensor disposed to monitor in-cylinder pressure, the method comprising:

monitoring engine speed, engine load, temperature;
monitoring, via the pressure sensor, a combustion pressure;
determining desired states for combustion variation parameters based upon the combustion pressure, wherein the combustion variation parameters include a ringing index and a coefficient of variation (COV);
determining a desired state for a combustion parameter based upon the engine speed, the engine load, and the temperature;
determining an adjustment to the desired state for the combustion parameter based upon the combustion variation parameters, wherein the adjustment to the desired state for the combustion parameter is selected to achieve acceptable states for the combustion variation parameters, including:
determining a desired ringing index and a measured ringing index,
determining a first adjustment in the desired state for the combustion parameter based upon a difference between desired ringing index and a measured ringing index,
determining a desired COV and a measured COV,
determining a second adjustment in the desired state for the combustion parameter based upon a difference between the desired COV and the measured COV,
determining a delta combustion parameter based upon the first and second adjustments in the desired state for the combustion parameter, and
adjusting the desired state for the combustion parameter based upon the delta combustion parameter;
measuring the combustion parameter;
and
controlling, via a controller, operation of the internal combustion engine based upon the measured combustion parameter and the adjusted desired state for the combustion parameter.

11 more elements

A multi-cylinder direct-injection internal combustion engine, comprising:

a plurality of pistons disposed in a plurality of cylinders and coupled to a rotatable crankshaft;
a plurality of sensors disposed to monitor engine speed, engine load, and temperature;
a pressure sensor disposed to monitor an in-cylinder pressure;
a controller, operatively connected to the internal combustion engine and in communication with the plurality of sensors and the pressure sensor, the controller including an instruction set, the instruction set executable to:
monitor engine speed, engine load, temperature;
monitor, via the pressure sensor, a combustion pressure;
determine desired states for combustion variation parameters including a ringing index and a COV-IMEP based upon the combustion pressure;
determine a desired state for a combustion parameter based upon the engine speed, the engine load, and the temperature;
determine an adjustment to the desired state for the combustion parameter based upon the ringing index and the COV-IMEP, wherein the adjustment to the desired state for the combustion parameter is selected to minimize the ringing index and the COV-IMEP;
including
determine a desired ringing index and a measured ringing index,
determine a first adjustment in the desired state for the combustion parameter based upon a difference between desired ringing index and a measured ringing index,
determine a desired COV and a measured COV,
determine a second adjustment in the desired state for the combustion parameter based upon a difference between the desired COV and the measured COV,
determine a delta combustion parameter based upon the first and second adjustments in the desired state for the combustion parameter, and
adjust the desired state for the combustion parameter based upon the delta combustion parameter;
measure the combustion parameter;
and
control operation of the internal combustion engine based upon the measured combustion parameter and the adjusted desired state for the combustion parameter.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/641,944Filed 5 Jul 2017
Published: US 2019/0010890 A110 Jan 2019
Granted: 19 Feb 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

F02D 41/401
With means for controlling injection timing or duration: controlling injection timing
F02B 75/18
Engines characterised by number of cylinders, e.g. single-cylinder engines: multi-cylinder engines
F02D 35/023
On interior conditions: by determining the cylinder pressure
F02D 35/026
By determining temperatures inside the cylinder, e.g. combustion temperatures: using an estimation