Intake device for internal combustion engine with supercharger

Patent metadata

Field	Value
Publication number	US-9228548-B2
Application number	US-201214128133-A
Country	US
Kind code	B2
Filing date	Feb 15, 2012
Priority date	Jun 22, 2011
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A compressor ( 5 ) of a turbo supercharger ( 3 ) is located between an air flow meter ( 12 ) and a throttle valve ( 13 ). An EGR passage ( 21 ) is connected to an intake passage ( 10 ) at a joint ( 22 ) upstream of the compressor ( 5 ). The following relationship (1) is satisfied between an intake passage volume (V 1 ) from the air flow meter ( 12 ) to the junction ( 22 ), an intake passage volume (V 2 ) from the compressor ( 5 ) to the throttle valve ( 13 ) and a maximum boost pressure (P b ) under operating conditions in which the introduction of EGR gas is performed, in order to prevent a mixed gas of fresh air and EGR gas from flowing back to the air flow meter ( 12 ) even under the maximum boost pressure (P b ).

V
1

>

V
2

×

(

P
b

-

P
1

P
1

)

×

(

P
1

P
b

)

κ
-
1

κ

(
1
)

First claim

The invention claimed is:

1. An intake device for an internal combustion engine with a supercharger, the intake device comprising an intake passage equipped with an air flow meter, a throttle valve and a recirculation valve, a compressor of the supercharger being located between the throttle valve and the air flow meter, the recirculation valve being adapted to release a pressure in the downstream of the compressor to the upstream of the compressor during closing of the throttle valve, an EGR passage of the internal combustion engine being connected to the intake passage at a junction upstream of the compressor so as to introduce EGR gas into an intake system through the EGR passage,
wherein either one of the following formulas (1) and (2) is satisfied between an intake passage capacity (V 1 ) from the air flow meter to the junction of the intake passage and the EGR passage, an intake passage capacity (V 2 ) from the compressor to the throttle valve and a maximum boost pressure (P b ) under operating conditions in which the introduction of the EGR gas is performed:

V
1

>

V
2

×

(

P
b

-

P
1

P
1

)

×

(

P
1

P
b

)

κ
-
1

κ

(
1
)

V
1

>

V
2

×

(

P
b

-

P
1

P
1

)

×

T
3

T
2

(
2
)

where P 1 is a pressure in the upstream of the compressor; κ is a specific heat ratio of a mixed gas of fresh air and EGR gas in the downstream of the compressor; T 2 is a temperature of gas in the downstream of the compressor under the maximum boost pressure (P b ); and T 3 is a temperature of gas released to the upstream of the compressor through the recirculation valve.

2. The intake device for the internal combustion engine with the supercharger according to claim 1 , wherein the gas temperature T 2 is given by the following formula based on an efficiency (η comp ) of the compressor,

T
2

=

T
1

+

T
2
′

-

T
1

η
comp

/
100

where T 1 is a temperature of the gas at the upstream of compressor; and T 2 ′ is a temperature of gas after theoretical isentropic compression by the compressor from the pressure (P 1 ) in the upstream of the compressor to the maximum boost pressure (P b ).

3. The intake device for the internal combustion engine with the supercharger according to claim 1 , wherein the gas temperature T 3 is determined by the following formula:

T
3

=

T
2

×

(

1

π
c

)

κ
-
1

κ

(
4
)

where π c is a pressure ratio (P b /P 1 ) of the compressor.

4. The intake device for the internal combustion engine with the supercharger according to claim 2 , wherei

Assignees

• Takaki Daisuke
• Nissan Motor

Inventors

• Takaki Daisuke

Classifications

• F02D41/18

  by measuring intake air flow · CPC title

• F02B37/00 Primary

  Engines characterised by provision of pumps driven at least for part of the time by exhaust · CPC title

• F02M25/0731

  Mechanical Engineering · mapped topic

• F02D41/0065

  Specific aspects of external EGR control (constructional details of EGR system F02M26/00) · CPC title

• F02M25/0709

  Mechanical Engineering · mapped topic