# US 11,306,688 B2 · Low-pressure EGR system with turbo bypass

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- Number: US 11,306,688 B2
- Document ID: US11306688B2
- Status: Granted
- Kind: B2
- Application number: 16/976,365
- Filed: 2019-02-28
- Published: 2021-05-13
- Granted: 2022-04-19
- Earliest claimed: 2018-02-28
- Assignees: Tenneco Inc.
- Applicants: Tenneco GmbH
- Inventors: Philipp Kreutziger; Michael Fischer; Jaroslaw Kierat
- Web page: https://patentgrep.com/patent/US11306688B2

## CPC

- F02M 26/07: Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
- B01D 46/0087: {Bypass or safety valves}
- B01D 46/71: with pressurised gas, e.g. pulsed air
- B01D 53/9454: {characterised by a specific device}
- F01N 3/021: by means of filters
- F01N 3/031: having means for by-passing filters, e.g. when clogged or during cold engine start
- F01N 3/035: with catalytic reactors
- F01N 3/101: {Three-way catalysts}
- F01N 3/2053: {By-passing catalytic reactors, e.g. to prevent overheating}
- F01N 3/28: Construction of catalytic reactors
- F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere}
- F02B 37/183: {Arrangements of bypass valves or actuators therefor}
- F02M 26/06: Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
- F02M 26/14: in relation to the exhaust system
- F02M 26/15: in relation to engine exhaust purifying apparatus
- F02M 26/17: in relation to the intake system
- F02M 26/23: Layout, e.g. schematics
- F02M 26/35: with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
- F02M 35/10157: {Supercharged engines}
- F02M 35/10222: {Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission}
- B01D 2255/915: Catalyst supported on particulate filters
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- F01N 2370/02: used in catalytic reactors
- F01N 2410/02: in case of high temperature, e.g. overheating of catalytic reactor
- Y02T 10/12: Improving ICE efficiencies
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The disclosure relates to a gasoline engine comprising an exhaust gas line which can be connected to an exhaust manifold of the gasoline engine, an intake line which can be connected to an intake manifold of the gasoline engine, a charge air compressor which is arranged in the intake line, and a turbine which is arranged in the exhaust gas line. The exhaust gas line has at least one bypass line with a bypass throttle valve, said line branching off from the exhaust gas line at a branch upstream of the turbine and branching back into the exhaust gas line at an opening downstream of the turbine. At least one exhaust gas recirculation line with an EGR throttle valve is provided, said line branching off from the exhaust gas line at a branch and opening into the intake line at an opening, wherein a coupling line with a first node point and a second node point is provided, the bypass line and the EGR line being combined in some sections in said coupling line; at least one particle filter is arranged in the coupling line; and the first node point is arranged downstream of the branch and downstream of the branch.

## Claims

### Claim 1

An exhaust gas conduction system for a gasoline engine comprising an exhaust gas line which can be connected to an exhaust manifold of the gasoline engine, an intake line which can be connected to an intake manifold of the gasoline engine, a charge air compressor, which is arranged in the intake line, and a turbine, which is arranged in the exhaust gas line, wherein the exhaust gas line has a bypass line with a bypass throttle valve, said bypass line branching off at a branch and branching back into the exhaust gas line at an opening, and wherein an exhaust gas recirculation line with an EGR throttle valve is provided, said recirculation line branching off from the exhaust gas line at a branch and opening into the intake line at an opening, wherein a coupling line with a first node point and a downstream second node point is provided, the bypass line and the EGR line being combined in some sections in said coupling line, wherein a particle filter is arranged in the coupling line, wherein the bypass line additionally has a bypass valve, which is positioned downstream of the first node point and upstream of the opening of the bypass line, wherein said bypass line branching off from the exhaust gas line upstream of the turbine wherein the first node point is positioned downstream of the branch of the exhaust gas recirculation line and downstream of the branch of the bypass line and in that the bypass throttle valve is positioned upstream of the first node point wherein an exhaust gas valve is provided in the exhaust gas line downstream of the branch of the exhaust gas recirculation line and upstream of the opening of the bypass line.

### Claim 2 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
the particle filter has a catalytically active 3-way coating for converting CO, HC and NOx.

### Claim 3 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
an EGR cooler is provided within the exhaust gas recirculation line upstream of the EGR throttle valve and downstream of the second node point.

### Claim 4 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
a 3-way exhaust gas catalytic converter and/or another particle filter is provided in the exhaust gas line downstream of the opening of the bypass line.

### Claim 5 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
the exhaust gas recirculation line is free of exhaust gas valves or exhaust gas flaps between the branch of the recirculation line and the first node point.

### Claim 6 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
when the EGR throttle valve is closed and when the bypass valve is closed, a first portion of the exhaust gas recirculation line, which extends between the branch of the recirculation line and the first node point can be used as a bypass.

### Claim 7 (depends on 6)

The exhaust gas conduction system according to claim 6, wherein
an exhaust gas valve is provided in the first portion of the exhaust gas recirculation line.

### Claim 8 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
an HP exhaust gas recirculation line is provided which has a branch downstream of the EGR cooler and an opening downstream of a charge air cooler.

### Claim 9 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
another particle filter is positioned in the exhaust gas line downstream of the branch of the exhaust gas recirculation line and upstream of the opening of the bypass line.

### Claim 10 (depends on 1)

The exhaust gas conduction system according to claim 1, wherein
an exhaust gas diversion is provided, which branches off at the second node point downstream of the particle filter and branches back into the exhaust gas line in an opening downstream of a 3-way catalytic converter and/or downstream of another particle filter, wherein a first diversion valve is positioned in the exhaust gas diversion.

### Claim 11 (depends on 10)

The exhaust gas conduction system according to claim 10, wherein
a diversion section is provided which branches off at a branch after the first diversion valve and branches back at an opening between the another particle filter and the 3-way catalytic converter, wherein a second diversion valve is provided in the diversion section and a third diversion valve is provided in the exhaust gas diversion downstream of the branch of the diversion section.

### Claim 12 (depends on 1)

An exhaust gas system and/or gasoline engine comprising an exhaust gas conduction system according to claim 1.

### Claim 13 (depends on 1)

A method for operating a gasoline engine with an exhaust gas conduction system or an exhaust gas system according to claim 1, wherein
a) in response to the gasoline engine being in cold starting mode, the bypass throttle valve and the bypass valve are open and the EGR throttle valve and the exhaust gas valve are closed, so that the exhaust gas flow is guided past the turbine through the bypass line and the particle filter,
b) in response to the gasoline engine being in partial load mode, the bypass throttle valve and the bypass valve are closed and the exhaust gas valve is open, wherein depending on the operating point of the engine, an exhaust gas mass flow within the exhaust gas recirculation line is adjusted via the EGR throttle valve, and
c) in response to the gasoline engine being in full load mode, the EGR throttle valve and the bypass valve are closed and the exhaust gas valve is open, wherein an exhaust gas mass flow that is designed to bypass the turbine is guided to the exhaust gas line via the bypass line and the first portion of the exhaust gas recirculation line, wherein the exhaust gas mass flow designed to bypass is adjusted via the bypass throttle valve depending on the operating point of the engine.

### Claim 14 (depends on 13)

The method according to claim 13, wherein
charge air is introduced into the exhaust gas line via a HPR-EGR line and a LP-EGR line and the particle filter is regenerated.