Fuel estimation apparatus

Patent metadata

Field	Value
Publication number	US-9845761-B2
Application number	US-201615176540-A
Country	US
Kind code	B2
Filing date	Jun 8, 2016
Priority date	Jun 11, 2015
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A fuel estimation apparatus includes a combustion characteristic acquisition portion and a mixing ratio estimation portion. The combustion characteristic acquisition portion acquiring a combustion characteristic value indicating a physical amount relating to a combustion of an internal combustion engine acquires the combustion characteristic values of the combustions executed in different combustion conditions. The mixing ratio estimation portion estimates the mixing ratios of various components included in a fuel, based on the combustion characteristic values acquired by the combustion characteristic acquisition portion.

First claim

What is claimed is:

1. A fuel estimation apparatus comprising:
a combustion characteristic acquisition portion acquiring a combustion characteristic value indicating a parameter relating to a combustion of an internal combustion engine, the combustion characteristic acquisition portion acquiring the combustion characteristic values of the combustions executed in different combustion conditions; and
a mixing ratio estimation portion estimating mixing ratios of various components included in a fuel, based on the combustion characteristic values acquired by the combustion characteristic acquisition portion.

2. The fuel estimation apparatus according to claim 1 , wherein
the component that is an estimation object of the mixing ratio is a component that is divided by types of a molecular structure.

3. The fuel estimation apparatus according to claim 2 , wherein
the types of the molecular structure include at least one of a normal paraffin type, an isoparaffin type, a naphthenic type, or an aromatic type.

4. The fuel estimation apparatus according to claim 1 , wherein
the combustion condition is a condition specified by a combination of parameters of plural types.

5. The fuel estimation apparatus according to claim 4 , wherein
the parameters of plural types include at least one of a cylinder pressure, a cylinder temperature, an intake-gas oxygen concentration, or an injection pressure.

6. The fuel estimation apparatus according to claim 1 , wherein
the internal combustion engine is a compression self-ignition type, and
the combustion characteristic value is a time period from a time point that the fuel is injected into a combustion chamber of the internal combustion engine to a time point that the fuel is self-ignited, or is a time period from a time point that the fuel injection is instructed to the time point that the fuel is self-ignited.

7. The fuel estimation apparatus according to claim 1 , wherein
when a multiple injection that the fuel is injected for plural times is executed in one combustion cycle of the internal combustion engine, the combustion characteristic acquisition portion acquires the combustion characteristic value relating to the combustion of the fuel injected before or after a main injection that injects an injection amount with a maximum value.

8. The fuel estimation apparatus according to claim 1 , further comprising:
a fuel cut instruction portion instructing to temporarily stop an injection of the fuel in a case where a predetermined condition is met during an operation of the internal combustion engine; and
a cut acquisition portion executing a learning combustion to inject the fuel at a slight amount and controlling the combustion at a required combustion condition during an fuel cut instruction period that the fuel cut instruction portion instructs a fuel cut, and acquiring the combustion characteristic value.

9. A fuel estimation apparatus comprising:
a combustion characteristic acquisition portion acquiring a combustion characteristic value indicating a parameter relating to a combustion of an internal combustion engine, the combustion characteristic acquisition portion acquiring the combustion characteristic values of the combustions executed in different combustion conditions; and
a mixing ratio estimation portion estimating mixing ratios of various components included in a fuel, based on the combustion characteristic values acquired by the combustion characteristic acquisition portion;
the component that is an estimation object of the mixing ratio is a component that is divided by types of a molecular structure, and
the types of the molecular structure include at least two of a normal paraffin type, an isoparaffin type, a naphthenic type, or an aromatic type.

Assignees

• Denso Corp

Inventors

• Hoshi Shinya
• Okabayashi Atsunori

Classifications

• Y02T10/44

  Cross-Sectional Technologies · mapped topic

• F02D41/0025

  Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures · CPC title

• F02D35/025

  by determining temperatures inside the cylinder, e.g. combustion temperatures · CPC title

• F02D35/023

  by determining the cylinder pressure · CPC title

• F02D2250/38

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