Title:
内燃機関の自着火時期推定装置
Document Type and Number:
Japanese Patent JP6740915
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To further exactly estimate self-ignition timing at ignition assist self-ignition combustion.SOLUTION: Main fuel for forming a premixed gas in a cylinder is injected by a fuel injection valve, next, assist fuel is injected into the cylinder, the assist fuel is ignited by a spark plug, and after that, ignition assist self-ignition combustion at which the premixed gas is compressively self-ignition combusted is performed. A heat generation rate ROHR with respect to a crank angle is calculated on the basis of in-cylinder pressure. In a crank angle range RCA which is set closer to a retardation side than a maximum heat generation rate crank angle CAmax, a crank angle at which the heat generation rate becomes maximum, an approximation formula APL in which the heat generation rate is made to approximate by a linear line is determined, and a zero heat generation rate crank angle CA0, a crank angle at which the heat generation rate becomes zero in the approximation formula, is determined. A difference dif between the maximum heat generation rate crank angle and the zero heat generation rate crank angle is calculated. A crank angle which is advanced by the difference from the maximum heat generation rate crank angle is estimated as self-ignition timing CAig.SELECTED DRAWING: Figure 9
Inventors:
Satoshi Tsuda
Application Number:
JP2017008984A
Publication Date:
August 19, 2020
Filing Date:
January 20, 2017
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02D45/00; F02B11/00; F02B23/10; F02D41/04; F02D41/38
Domestic Patent References:
| JP2007262926A | ||||
| JP2016211420A | ||||
| JP2007126997A |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Shinji Mitsuhashi
Yuichi Morimoto
Koichi Ito
Jun Tsuruta
Tetsuro Shimada
Shinji Mitsuhashi
Yuichi Morimoto
Koichi Ito