Apparatus and method for controlling fuel injection

Patent metadata

Field	Value
Publication number	US-10113488-B2
Application number	US-201715710430-A
Country	US
Kind code	B2
Filing date	Sep 20, 2017
Priority date	Dec 14, 2016
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

An apparatus for controlling fuel injection according to an exemplary embodiment of the present disclosure may include a driving information detector for detecting driving information including a fresh air amount flowing into an intake manifold through a throttle valve, a recirculation gas amount supplied to the intake manifold through an exhaust gas recirculation apparatus, a fuel vapor amount supplied to the intake manifold through a canister purge system, a gas amount supplied to a cylinder from the intake manifold, an internal pressure of the intake manifold, an internal temperature of the intake manifold, a pressure of a recirculation gas and a temperature of the recirculation gas; an injector for injecting fuel into the cylinder; and a controller for calculating gas amount supplied to the cylinder at a next intake stroke from the driving information and controlling fuel amount injected by the injector at the next intake stroke to be a target air-fuel ratio.

First claim

What is claimed is:

1. An apparatus for controlling fuel injection comprising:
a driving information detector for detecting driving information including a fresh air amount flowing into an intake manifold through a throttle valve, a recirculation gas amount supplied to the intake manifold through an exhaust gas recirculation apparatus, a fuel vapor amount supplied to the intake manifold through a canister purge system, a gas amount supplied to a cylinder from the intake manifold, an internal pressure of the intake manifold, an internal temperature of the intake manifold, a pressure of a recirculation gas and a temperature of the recirculation gas;
an injector for injecting fuel into the cylinder; and
a controller for calculating a gas amount supplied to the cylinder at a next intake stroke from the driving information and controlling a fuel amount injected by the injector at the next intake stroke to be a target air-fuel ratio.

2. The apparatus of claim 1 , wherein
the controller calculates the fuel amount injected to the cylinder at the next intake stroke based on a gas amount flowing backward into the intake manifold at a previous compression stroke, a gas amount flowing backward into the intake manifold at a current compression stroke and a gas amount supplied to the cylinder at a current intake stroke.

3. The apparatus of claim 2 , wherein
the controller further calculates a pressure in the intake manifold from variation of an air amount passing through the intake manifold and variation of the recirculation gas amount, and
calculates the gas amount supplied to the cylinder at the next intake stroke from the pressure in the intake manifold.

4. The apparatus of claim 3 , wherein
the gas amount supplied to the cylinder in accordance with the pressure in the intake manifold is determined by experiments.

5. The apparatus of claim 3 , wherein
the pressure in the intake manifold and the pressure of the recirculation gas is calculated from the pressure in the intake manifold at the current intake stroke, the pressure of the recirculation at the current intake stroke, a pressure variation in the intake manifold at the current intake stroke, a pressure variation of the recirculation at the current intake stroke, the pressure variation in the intake manifold at a previous intake stroke, and the pressure variation of the recirculation flowing into the intake manifold at the previous intake stroke.

6. The apparatus of claim 5 , wherein
the pressure in the intake manifold is calculated from an equation of

[

P
IM

P
EGR

]

N
+
1

=

[

P
IM

P
EGR

]

N

+

Δ
⁢

⁢
t

2

⁢

(

[

P
.

IM

P
.

EGR

]

N
-
1

+

[

P
.

IM

P
.

EGR

]

N

)

,

wherein P IM is the pressure in the intake manifold, P EGR is the pressure of the recirculation gas, {dot over (P)} IM is a pressure variation in the intake manifold, and {dot over (P)} EGR is pressure variation of the recirculation gas.

7. The apparatus of claim 2 , wherein
the fuel amount injected to the cylinder at the next intake stroke is calculated from the gas amount supplied to the cylinder at the current intake stroke, the gas amount flowing backward into the intake manifold at the current compression stroke, the gas amount flowing backward into the intake manifold at the previous compression stroke, and the target air-fuel ratio.

8. The apparatus of claim 7 , wherein
the fuel amount injected to the cylinder at the next intake stroke is calculated from an equation of

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Han Dong Hee
• Hong Seungwoo
• Park Yeongseop
• Park Jong Il
• Lee Hyungbok

Classifications

• F02D41/30 Primary

  Controlling fuel injection {(F02D41/182, F02D41/24 take precedence)} · CPC title

• F02D41/18

  by measuring intake air flow · CPC title

• F02D2200/0408

  Estimation of intake manifold pressure · CPC title

• F02D35/02

  on interior conditions · CPC title

• F02D35/023

  by determining the cylinder pressure · CPC title