Controller for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10119491-B2
Application number	US-201514744787-A
Country	US
Kind code	B2
Filing date	Jun 19, 2015
Priority date	Jun 23, 2014
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A controller for an internal combustion engine, the internal combustion engine including a fuel injection valve configured to supply fuel into a cylinder. The controller includes an electronic control unit configured to acquire an actual heat generation rate at time of combustion; and correct at least one of fuel injection pressure or amount of fuel injected when deviation amount between reference heat generation rate gradient and actual heat generation rate gradient is equal to or greater than predetermined value such that the deviation decreases. The reference heat generation rate gradient is a gradient of a predetermined reference heat generation rate at which a predetermined time elapses after a heat generation rate begins to rise. The actual heat generation rate gradient being a gradient of an actual heat generation rate acquired by the electronic control unit at which the predetermined time elapses after the heat generation rate begins to rise.

First claim

What is claimed is:

1. A controller for an internal combustion engine, the internal combustion engine including a fuel injection valve configured to supply fuel into a plurality of cylinders and swirl control valves provided in the respective cylinders, the controller comprising
an electronic control unit configured to
i) acquire an actual heat generation rate at a time of combustion, and
ii) correct at least one of a fuel injection pressure or an amount of fuel injected when a deviation amount between a reference heat generation rate gradient and an actual heat generation rate gradient is equal to or greater than a predetermined value such that the deviation amount decreases, iii) obtain, for the respective cylinders, deviation timings at which the deviation amounts between the reference heat generation rate gradient and the actual heat generation rate gradient become equal to or greater than the predetermined value when the deviation amounts between the reference heat generation rate gradient and the actual heat generation rate gradient are equal to or greater than the predetermined value, and
iv) correct at least one of openings of the swirl control valves such that the deviation timings of the respective cylinders become the same timing,
the reference heat generation rate gradient being a gradient of a predetermined reference heat generation rate at which a predetermined time elapses after a heat generation rate begins to rise, and
the actual heat generation rate gradient being a gradient of an actual heat generation rate acquired by the electronic control unit at which the predetermined time elapses after the heat generation rate begins to rise.

2. The controller according to claim 1 ,
wherein the electronic control unit is configured to
i) obtain an average value of the deviation timings of the plurality of cylinders,
ii) correct at least one of the openings of the swirl control valves of the respective cylinders such that the deviation timings of the respective cylinders become the average value, and
iii) set a correction amount for at least one of the fuel injection pressure or the amount of fuel injected to be greater as the average value of the deviation timings separates farther from a reference peak timing at which the reference heat generation rate becomes maximum.

3. The controller according to claim 1 ,
wherein the electronic control unit is configured to
i) obtain an average value of the deviation timings of the plurality of cylinders,
ii) correct at least one of the openings of the swirl control valves of the respective cylinders such that the deviation timings of the respective cylinders become the average value, and
iii) set a correction amount for at least one of the fuel injection pressure or the amount of fuel injected to be greater as the average value of the deviation timings is closer to a timing at which the reference heat generation rate begins to rise.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nagano Shota

Classifications

• F02D35/028

  by determining the combustion timing or phasing · CPC title

• F02D2200/0602

  Fuel pressure · CPC title

• F02D2250/38

  Control for minimising smoke emissions, e.g. by applying smoke limitations on the fuel injection amount · CPC title

• F02D41/008

  Controlling each cylinder individually · CPC title

• F02D41/40 Primary

  with means for controlling injection timing or duration · CPC title