Patent EP1091113A2 successfully refreshed from Google Patents.
EP1091113A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
High-temperature coolant loop for cooled exhaust gas recirculation for internal combustion engines
Assignee: Mahle Behr GmbH and Co KG
•
Filing: 2000-09-18
•
Granted: —
•
Expires: 2020-09-18
Abstract
Abstract An EGR system for an internal combustion engine has a separate, secondary high-temperature cooling loop, in addition to a primary cooling loop. In the secondary cooling loop, coolant flows through a secondary high-temperature exhaust gas cooler, which is located upstream of the primary exhaust gas cooler. A large amount of heat is transferred from the exhaust gases to the coolant in the secondary high-temperature cooling loop. The heat absorbed by the high-temperature coolant is rejected in a secondary high-temperature radiator. Heat absorbed by the primary coolant is rejected in a primary radiator. The two radiators occupy the same amount of frontal area as a single radiator used in a conventional single-stage EGR cooling system, but overall reject more heat to the ambient. In an alternate arrangement, the EGR system for a liquid-cooled internal combustion engine has a single exhaust gas cooler which is cooled by an EGR cooling loop that is independent of the engine cooling system. The EGR cooling loop includes a secondary radiator located adjacent the primary engine cooling radiator, and the two radiators together occupy the same frontal area as a single radiator used in a conventional single-stage EGR cooling system, but overall reject more heat to the ambient.
Inventors
- 👤 John C. Wall
- 👤 Markus Flik
- 👤 Hans Lange
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
F; F02; F02B; F02B29/00; F02B29/04; F02B29/0406; F02B29/0425; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/28; F02M26/02; F02M26/04; F02M26/05; F02M26/14; F02M26/16; F02M26/24; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
159 words
An exhaust gas cooling system for cooling exhaust gas in the exhaust
gas recirculation system of an internal combustion engine prior to admixing with charge
air for the engine, the exhaust gas cooling system comprising: a primary cooling loop including: a primary radiator; a primary exhaust gas cooler in fluid communication with the
primary radiator; and a primary pump, that circulates coolant through the primary
cooling loop from the primary exhaust gas cooler to the primary radiator and
back to the primary exhaust gas cooler; and
a secondary cooling loop including: a secondary radiator; a secondary exhaust gas cooler in fluid communication with the
secondary radiator; and a secondary pump that circulates coolant through the secondary
cooling loop from the secondary exhaust gas cooler to the secondary radiator and
back to the secondary exhaust gas cooler; whereby recirculating exhaust gas is cooled first in the secondary exhaust
gas cooler, and then is cooled in the primary exhaust gas cooler.
Claim 2
Dependent Claim
25 words
A cooling system as claimed in claim 1, wherein the engine is liquid-cooled,
and the primary cooling loop is part of the engine cooling system.
Claim 3
Dependent Claim
20 words
A cooling system as claimed in claim 2, wherein the primary radiator
is the radiator of the engine cooling system.
Claim 4
Dependent Claim
25 words
A cooling system as claimed in any one of the preceding claims,
wherein the secondary radiator has a smaller frontal area than the
primary radiator.
Claim 5
Dependent Claim
19 words
A cooling system as claimed in any one of the preceding claims,
wherein the engine is a diesel engine.
Claim 6
Dependent Claim
148 words
In an exhaust gas recirculation system for an internal combustion
engine, the system comprising an EGR valve for controlling the flow of exhaust gas
diverted from the engine exhaust gas stream and recirculated to the engine intake, and a
primary cooling loop including a primary exhaust gas cooler located downstream of the
EGR valve in the direction of recirculated exhaust gas flow, a primary radiator and a
primary pump for circulating coolant through the primary cooling loop, the
improvement comprising: a secondary cooling loop comprising: a secondary exhaust gas cooler located upstream of
the primary exhaust gas cooler in the direction of recirculated exhaust gas flow; a secondary radiator having a smaller frontal area
than the primary radiator; and a secondary pump for circulating coolant through
the secondary cooling loop from the secondary exhaust gas cooler to the
secondary radiator and back to the secondary exhaust gas cooler.
Claim 7
Dependent Claim
27 words
An exhaust gas recirculation system as claimed in claim 6, wherein the
engine is liquid-cooled, and the primary cooling loop is part of the engine cooling
system.
Claim 8
Dependent Claim
22 words
An exhaust gas recirculation system as claimed in claim 7, wherein the
primary radiator is the radiator of the engine cooling system.
Claim 9
Dependent Claim
145 words
In an internal combustion engine having an exhaust gas recirculation
system comprising an EGR valve for controlling the flow of exhaust gas diverted from
the engine exhaust gas stream and recirculated to the engine intake, a primary cooling
loop including a primary exhaust gas cooler located downstream of the EGR valve in the
direction of recirculated exhaust gas flow, a primary radiator and a primary pump for
circulating coolant through the primary cooling loop, the improvement comprising: a secondary cooling loop comprising: a secondary exhaust gas cooler located upstream of
the primary exhaust gas cooler in the direction of recirculated exhaust gas flow; a secondary radiator having a smaller frontal area
than the primary radiator; and a secondary pump for circulating coolant through
the secondary cooling loop from the secondary exhaust gas cooler to the
secondary radiator and back to the secondary exhaust gas cooler.
Claim 10
Dependent Claim
26 words
An internal combustion engine as claimed in claim 9, wherein the
engine is liquid-cooled, and the primary cooling loop is part of the engine cooling
system.
Claim 11
Dependent Claim
21 words
An internal combustion engine as claimed in claim 10, wherein the
primary radiator is the radiator of the engine cooling system.
Claim 12
Dependent Claim
174 words
In a motor vehicle having an internal combustion engine with an
exhaust gas recirculation system for the engine, the system comprising an EGR valve
for controlling the flow of exhaust gas diverted from the engine exhaust gas stream and
recirculated to the engine intake, and a primary cooling loop including a primary
exhaust gas cooler located downstream of the EGR valve in the direction of recirculated
exhaust gas flow, a primary radiator at the front of the vehicle, and a primary pump for
circulating coolant through the primary cooling loop, the improvement comprising: a secondary cooling loop for the exhaust gas recirculation system
comprising: a secondary exhaust gas cooler located upstream of
the primary exhaust gas cooler in the direction of recirculated exhaust gas flow; a secondary radiator adjacent the primary radiator,
the secondary radiator having a smaller frontal area than the primary radiator;
and a secondary pump for circulating coolant through
the secondary cooling loop from the secondary exhaust gas cooler to the
secondary radiator and back to the secondary exhaust gas cooler.
Claim 13
Dependent Claim
25 words
A motor vehicle as claimed in claim 12, wherein the engine is liquid-cooled,
and the primary cooling loop is part of the engine cooling system.
Claim 14
Dependent Claim
20 words
A motor vehicle as claimed in claim 13 ,wherein the primary radiator
is the radiator of the engine cooling system.
Claim 15
Dependent Claim
20 words
A motor vehicle as claimed in any one of claims 12 to 14,
wherein the engine is a diesel engine.
Claim 16
Dependent Claim
34 words
A motor vehicle as claimed in any one of claims 12 to 15, wherein the primary radiator
and the secondary radiator together occupy the entire frontal area of the vehicle
available for radiator cooling.
Claim 17
Dependent Claim
137 words
In a motor vehicle having a liquid-cooled internal combustion engine
comprising: an engine cooling system having an engine cooling loop including a
primary radiator at the front of the vehicle, and an exhaust gas recirculation system having an EGR valve for controlling
the flow of exhaust gas diverted from the engine exhaust gas stream and recirculated to
the engine intake, and an exhaust gas cooler located downstream of the EGR valve in
the direction of recirculated exhaust gas flow, the improvement comprising: an EGR cooling loop for the exhaust gas cooler which is
independent of the engine cooling loop and comprises: a secondary radiator adjacent the primary radiator; and an EGR coolant pump for circulating coolant through the
EGR cooling loop from the exhaust gas cooler to the secondary radiator and back
to the exhaust gas cooler.
Claim 18
Dependent Claim
15 words
A motor vehicle as claimed in claim 17, wherein the engine is a
diesel engine.
Claim 19
Dependent Claim
31 words
A motor vehicle as claimed in claim 17 or 18, wherein the primary radiator
and the secondary radiator together occupy the entire frontal area of the vehicle
available for radiator cooling.
Claim 20
Dependent Claim
127 words
In a liquid-cooled internal combustion engine comprising: an engine cooling system having an engine cooling loop including a
primary radiator, and an exhaust gas recirculation system having an EGR valve for controlling
the flow of exhaust gas diverted from the engine exhaust gas stream and recirculated to
the engine intake, and an exhaust gas cooler located downstream of the EGR valve in
the direction of recirculated exhaust gas flow, the improvement comprising: an EGR cooling loop for the exhaust gas cooler which is
independent of the engine cooling loop and comprises: a secondary radiator adjacent the primary radiator; and an EGR coolant pump for circulating coolant through the
EGR cooling loop from the exhaust gas cooler to the secondary radiator and back
to the exhaust gas cooler.
Claim 21
Dependent Claim
14 words
An engine as claimed in claim 20, wherein the engine is a diesel
engine.
References Cited (Backward Citations)
US5607010A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.