IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0739190
(2007-04-24)
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등록번호 |
US-7669584
(2010-04-21)
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발명자
/ 주소 |
- Matekunas, Frederic Anton
- Battiston, Paul Anthony
- Szymkowicz, Patrick G.
- Gangopadhyay, Anupam
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출원인 / 주소 |
- GM Global Technology Operations, Inc.
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인용정보 |
피인용 횟수 :
2 인용 특허 :
12 |
초록
▼
The invention comprises a method to determine a position of a piston in a cylinder of an engine during ongoing operation, comprising adapting pressure sensing devices to monitor in-cylinder pressure, and, operating the engine. In-cylinder pressure is monitored along with a corresponding engine crank
The invention comprises a method to determine a position of a piston in a cylinder of an engine during ongoing operation, comprising adapting pressure sensing devices to monitor in-cylinder pressure, and, operating the engine. In-cylinder pressure is monitored along with a corresponding engine crank position. The engine is operated in a motoring mode and in a cylinder firing mode, and a plurality of instantaneous in-cylinder pressure states are determined during compression and expansion strokes. Pressure ratios are determined based upon the instantaneous in-cylinder pressure states, which are used to determine an engine crank angle and compression ratio error and, adjust the monitored engine crank position based upon the crank angle error and readjust engine operation according to these sensed errors.
대표청구항
▼
The invention claimed is: 1. Method for controlling operation of an internal combustion engine, the engine ongoingly operative in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising: monitoring in-cylinder pressure and a corresponding e
The invention claimed is: 1. Method for controlling operation of an internal combustion engine, the engine ongoingly operative in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising: monitoring in-cylinder pressure and a corresponding engine crank position; operating the engine in a motoring mode and determining a plurality of instantaneous in-cylinder pressure states and corresponding engine crank positions; operating the engine in a cylinder firing mode and determining a plurality of instantaneous in-cylinder pressure states at the corresponding engine crank positions; determining a plurality of pressure ratios during ongoing engine operation at the corresponding engine crank positions based upon the instantaneous in-cylinder pressure states, each pressure ratio comprising a ratio between the instantaneous in-cylinder pressure state at the engine crank position determined when operating the engine in the motoring mode and the corresponding instantaneous in-cylinder pressure state at the engine crank position determined when operating the engine in the firing mode; and, determining an instantaneous crank angle error associated with the pressure ratios determined during the ongoing engine operation. 2. The method of claim 1, wherein operating the engine in a motoring mode comprises deactivating fuel flow to the engine while the engine is spinning. 3. The method of claim 2, wherein deactivating fuel flow to the engine while the engine is spinning comprises deactivating the fuel during an engine deceleration event. 4. The method of claim 2, wherein deactivating fuel flow to the engine while the engine is spinning further comprises spinning the engine with an electric machine. 5. The method of claim 1, further comprising applying the instantaneous crank angle error as an offset to the monitored engine crank position to determine a corrected crank angle during the ongoing engine operation. 6. The method of claim 5, further comprising controlling an engine actuator based upon the corrected crank angle. 7. The method of claim 6, wherein controlling an engine actuator based upon the corrected crank angle further comprises controlling timing of fuel injection when the engine is operating in a compression-ignition mode. 8. The method of claim 6, wherein controlling an engine actuator based upon the corrected crank angle further comprises controlling spark ignition timing when the engine comprises a spark-ignition engine. 9. The method of claim 5, wherein controlling an engine actuator based upon the corrected crank error further comprises controlling phasing of an engine intake valve. 10. Method to determine a position of a piston in a cylinder of an engine, said engine comprising a direct-injection, four-stroke, internal combustion engine including a variable volume combustion chamber defined by the piston reciprocating within the cylinder between top-dead-center and bottom-dead-center points and a cylinder head; the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising: adapting a plurality of pressure sensing devices to monitor in-cylinder pressure during ongoing operation; monitoring in-cylinder pressure and a corresponding engine crank position; operating the engine in a motoring mode and determining a plurality of instantaneous in-cylinder pressure states and corresponding engine crank positions; operating the engine in a cylinder firing mode and determining a plurality of instantaneous in-cylinder pressure states at the corresponding engine crank positions; determining a plurality of pressure ratios at the corresponding engine crank positions based upon the instantaneous in-cylinder pressure states, each pressure ratio comprising a ratio between the instantaneous in-cylinder pressure state at the engine crank position determined when operating the engine in the motoring mode and the corresponding instantaneous in-cylinder pressure state at the engine crank position determined when operating the engine in the firing mode; determining an instantaneous crank angle error associated with the pressure ratios determined during the ongoing engine operation; and, adjusting the monitored engine crank position based upon the instantaneous crank angle error. 11. The method of claim 10, further comprising: determining a compression ratio error based upon the pressure ratios; and, monitoring cylinder integrity based upon the compression ratio error. 12. Method to determine a position of a piston in a cylinder of an engine, said engine comprising a direct-injection, four-stroke internal combustion engine including a variable volume combustion chamber defined by the piston reciprocating within the cylinder between top-dead-center and bottom-dead-center points and a cylinder head; the piston reciprocating in repetitive cycles each cycle comprising intake, compression, expansion, and exhaust strokes, the method comprising: adapting a plurality of pressure sensing devices to monitor in-cylinder pressure during ongoing operation; operating the engine lean of stoichiometry; monitoring in-cylinder pressure and a corresponding engine crank position; operating the engine in a motoring mode and determining a plurality of instantaneous in-cylinder pressure states and corresponding engine crank positions; operating the engine in a cylinder firing mode and determining a plurality of instantaneous in-cylinder pressure states at the corresponding engine crank positions; determining a plurality of pressure ratios at the corresponding engine crank positions based upon the instantaneous in-cylinder pressure states, each pressure ratio comprising a ratio between the instantaneous in-cylinder pressure state at the engine crank position determined when operating the engine in the motoring mode and the corresponding instantaneous in-cylinder pressure state at the engine crank position determined when operating the engine in the firing mode; determining an instantaneous crank angle error associated with the pressure ratios determined during the ongoing engine operation; and, adjusting the monitored engine crank position based upon the instantaneous crank angle error. 13. The method of claim 12, wherein operating the engine in the motoring mode comprises deactivating fuel flow to the engine while the engine is spinning. 14. The method of claim 13, wherein operating the engine in the cylinder firing mode comprises activating fuel flow to the engine. 15. The method of claim 12, further comprising: operating the engine in the motoring mode and in the cylinder firing mode during the ongoing engine operation; determining the plurality of pressure ratios based upon the instantaneous in-cylinder pressure states determined during the ongoing engine operation; determining the instantaneous crank angle error associated with the pressure ratios determined during the ongoing engine operation; and, adjusting the monitored engine crank position based upon the instantaneous crank angle error during the ongoing engine operation. 16. The method of claim 12, further comprising an engine and control module operative to execute the method.
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