IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0947997
(2007-11-30)
|
등록번호 |
US-7606651
(2009-11-10)
|
우선권정보 |
JP-2006-325288(2006-12-01) |
발명자
/ 주소 |
- Kojima, Kazuo
- Haraguchi, Hiroshi
- Morimoto, Youhei
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
11 |
초록
▼
A control apparatus for a multi-cylinder internal combustion engine includes pressure sensors used for acquiring combustion chamber pressure data for each engine cylinder, during each of a series of selection intervals respectively corresponding to that cylinder, with each selection interval corresp
A control apparatus for a multi-cylinder internal combustion engine includes pressure sensors used for acquiring combustion chamber pressure data for each engine cylinder, during each of a series of selection intervals respectively corresponding to that cylinder, with each selection interval corresponding to a specific angular displacement of the crankshaft and having a timing determined with respect to a reference piston position in the corresponding cylinder. The timing of the selection intervals is adjusted in accordance with current conditions of the engine, such as a fuel injection mode, to be appropriate for monitoring combustion conditions in the cylinders.
대표청구항
▼
What is claimed is: 1. A control apparatus for a multi-cylinder internal combustion engine, comprising at least two cylinder pressure sensors respectively coupled to corresponding cylinders of said multi-cylinder internal combustion engine, with each said cylinder pressure sensor adapted to detect
What is claimed is: 1. A control apparatus for a multi-cylinder internal combustion engine, comprising at least two cylinder pressure sensors respectively coupled to corresponding cylinders of said multi-cylinder internal combustion engine, with each said cylinder pressure sensor adapted to detect values of combustion chamber pressure of said corresponding cylinder, and processing circuitry adapted to acquire digital data as combustion chamber pressure data for each of said cylinders, from detection results of said corresponding cylinder pressure sensor, within each angular region of a specific series of angular regions that correspond to said cylinder and that are part of a continuous non-overlapping sequence of angular regions, each of said angular regions corresponding to a rotation of an output shaft of said multi-cylinder internal combustion engine through a specific angular displacement; wherein said control apparatus comprises timing adjustment circuitry adapted to set a timing of each of said angular regions in accordance with a current operating condition of said multi-cylinder internal combustion engine, said timing being determined for each of said angular regions with respect to a reference position of a piston of said corresponding cylinder. 2. A control apparatus as claimed in claim 1, wherein: said cylinder pressure sensors produce respective sensor signals as analog signals and said control apparatus comprises an A/D (analog to digital) converter circuit and a signal selector circuit controlled by said timing adjustment circuitry for selecting one of said sensor signals to be converted to digital signal form by said A/D converter circuit, with changeover of selection of successive sensor signals occurring at a sampling interval changeover timing; and said timing adjustment circuitry is adapted to set said timing of said angular regions as said sampling interval changeover timing, and to determine said sampling interval changeover timing in accordance with said current operating condition of said multi-cylinder internal combustion engine. 3. A control apparatus as claimed in claim 1, wherein: for each of said cylinders, said combustion chamber pressure data are acquired from said detection results in each of periodically occurring intervals, with a period corresponding to two rotations of said engine output shaft, and an extent of each of respective intervals in which said conversion is applied, for each of said sensor signals, corresponds to two complete rotations of said engine output shaft divided by a total number of said cylinders of said multi-cylinder internal combustion engine. 4. A control apparatus as claimed in claim 1, comprising a plurality of fuel injection devices coupled to respective ones of said cylinders, and fuel injection control circuitry adapted to control said fuel injection devices for supplying fuel to said combustion chambers, wherein said timing adjustment circuitry sets said timing of said angular regions in accordance with a fuel injection control mode that is currently applied by said fuel injection control circuitry. 5. A control apparatus as claimed in claim 4, wherein: said multi-cylinder internal combustion engine comprises an exhaust system, and an exhaust gas cleansing device installed in said exhaust system; said fuel injection control circuitry is operable for selectively establishing a normal fuel injection mode and a regeneration control mode, said regeneration control mode being appropriate for effecting regeneration of said exhaust gas cleansing device, and said timing adjustment circuitry is adapted to selectively set said timing of said angular regions in accordance with whether or not said regeneration control mode is established. 6. A control apparatus as claimed in claim 5, wherein while said regeneration control mode is established, said timing of said angular regions is adjusted to become delayed by comparison with a value of said timing during with operation in said normal fuel injection mode. 7. A control apparatus as claimed in claim 6, wherein when said regeneration control mode becomes established, said timing adjustment circuitry is adapted to set said timing of said angular regions at a first value, and to thereafter sporadically set said each timing at a second value that is delayed by comparison with said first value. 8. A control apparatus as claimed in claim 4, wherein when a change to a new fuel injection control mode and a corresponding change to a new value of timing of said angular regions are required to be made, said fuel injection control circuitry and said timing adjustment circuitry are adapted to apply said change to the new fuel injection control mode and said change to the new value of timing concurrently. 9. A control apparatus as claimed in claim 4, wherein under a condition that a change to a new fuel injection control mode, and a corresponding change to a new value of timing of said angular regions, are required to be made, while, said new value of said timing of the angular regions is more advanced than a currently established value of said timing, and a current angular position of said output shaft corresponds to a timing that is more advanced than said new value of timing of the angular regions, said fuel injection control circuitry and said timing adjustment circuitry are adapted to apply said change to said new fuel injection control mode and said change to said new value of timing of the angular regions concurrently, for a cylinder that is an immediately succeeding cylinder in a firing sequence of said multi-cylinder internal combustion engine. 10. A control apparatus as claimed in claim 4, wherein under a condition that a change to a new fuel injection control mode, and a corresponding change to a new value of timing of said angular regions, are required to be made, while, said new value of said timing of the angular regions is more advanced than a currently established value of said timing, and a current angular position of said output shaft corresponds to a timing that is not more advanced than said new value of timing of the angular regions, said fuel injection control circuitry and said timing adjustment circuitry are adapted to apply said change to said new fuel injection control mode and said change to said new value of timing of the angular regions concurrently, for a cylinder which follows an immediately succeeding cylinder in a firing sequence of said multi-cylinder internal combustion engine. 11. A control apparatus as claimed in claim 1, wherein: said control apparatus comprises learning processing circuitry adapted to perform processing for learning respective deviations of output characteristics of said cylinder pressure sensors, and said timing adjustment circuitry is adapted to selectively alter said timing of said angular regions in accordance with whether or not said learning processing is being performed. 12. A control apparatus as claimed in claim 11, wherein while said learning processing is being performed, said timing adjustment circuitry is adapted to delay said timing of said angular regions, by comparison with said timing while said learning processing is not being performed. 13. A control apparatus as claimed in claim 1, wherein: said cylinder pressure sensors produce respective sensor signals as analog signals and said control apparatus comprises a plurality of A/D (analog to digital) converter circuits each adapted to convert a corresponding one of said sensor signals to a digital signal, and a signal selector circuit controlled by said timing adjustment circuitry for selecting one of said digital signals produced from said A/D converter circuits; and said timing adjustment circuitry is adapted to determine said timing of said angular regions by setting a sampling interval changeover timing applied by said signal selector circuit, said sampling interval changeover timing being determined in accordance with said current operating condition of said multi-cylinder internal combustion engine.
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