# US 8,783,029 B2 · Supercharged internal combustion engine and method for operating an internal combustion engine of said type

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- Number: US 8,783,029 B2
- Document ID: US8783029B2
- Status: Granted
- Kind: B2
- Application number: 13/346,558
- Filed: 2012-01-09
- Published: 2012-07-12
- Granted: 2014-07-22
- Earliest claimed: 2011-01-12
- Assignees: Ford Global Technologies, LLC
- Applicants: Christian Winge Vigild; Andreas Kuske; Daniel Roettger; Juergen Karl Stief
- Inventors: Christian Winge Vigild; Andreas Kuske; Daniel Roettger; Juergen Karl Stief
- Web page: https://patentgrep.com/patent/US8783029B2

## CPC

- F02D 23/00: Controlling engines characterised by their being supercharged
- F02B 29/0475: {the intake air cooler being combined with another device, e.g. heater, valve, compressor, filter or EGR cooler, or being assembled on a special engine location}
- F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)}
- F02D 41/0052: {Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount}
- F02D 41/144: {Sensor in intake manifold}
- F02D 41/1455: {with sensor resistivity varying with oxygen concentration (F02D41/1456 takes precedence)}
- F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
- 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 26/46: for determining the characteristics of gases, e.g. composition
- F02M 35/10393: {for characterising a multi-component mixture, e.g. for the composition such as humidity, density or viscosity}
- F02M 26/15: in relation to engine exhaust purifying apparatus
- F02M 26/25: with coolers having bypasses
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A supercharged internal combustion engine is provided. The engine comprises a cylinder, an intake line in an intake system, for supplying charge air to the cylinder, an exhaust line for discharging exhaust gases, an exhaust-gas turbocharger including a turbine arranged in the exhaust line and a compressor arranged in the intake line, an exhaust-gas recirculation arrangement including a recirculation line which branches off from the exhaust line downstream of the turbine and opens into the intake line upstream of the compressor, and a sensor for detecting the concentration Ci,intake of a component i of the charge air in the intake system provided downstream of the opening of the recirculation line into the intake line. In this way, the exhaust-gas recirculation may be regulated based on feedback from the sensor to control emissions.

## Claims

### Claim 1

A method for operating an engine with a turbocharger having a compressor and high-pressure and low-pressure exhaust as recirculation, comprising:
adjusting a low-pressure recirculation rate in a low-pressure exhaust gas recirculation line via a shut-off element in the recirculation line based on a concentration Ci,intake of a component i in charge air detected by a sensor arranged between the compressor and a downstream charge-air cooler, the concentration determining a NOx concentration in exhaust gas.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the concentration Ci,intake is used to determine a proportion Fintake of a charge air fraction resulting from combustion, and wherein the proportion Fintake is used to determine a nitrogen oxide concentration CNOx,exhaust in the exhaust gas.

### Claim 3

A method for operating a supercharged internal combustion engine including both an LP-EGR and HP-EGR system, comprising:
adjusting an LP-EGR valve based on an oxygen concentration in charge air detected by an intake system sensor upstream of a charge-air cooler and downstream of a compressor, and adjusting an HP-EGR valve based on estimated HP-EGR flow when both the LP-EGR and HP-EGR systems are enabled.

### Claim 4 (depends on 3)

The method of claim 3, further comprising, if only the LP-EGR system is enabled, adjusting only the LP-EGR valve based on the oxygen concentration detected by the sensor.

### Claim 5 (depends on 3)

The method of claim 3, further comprising, if only the HP-EGR system is enabled, adjusting only the HP-EGR valve based on the oxygen concentration detected by the sensor.

### Claim 6

A supercharged internal combustion engine, comprising:
a cylinder;
an intake line in an intake system for supplying charge air to the cylinder;
an exhaust line for discharging exhaust gases;
an exhaust-gas turbocharger including a turbine arranged in the exhaust line and a compressor arranged in the intake line;
an exhaust-gas recirculation arrangement including a recirculation line which branches off from the exhaust line downstream of the turbine and opens into the intake line upstream of the compressor; and
a sensor for detecting a concentration Ci,intake of a component i of the charge air in the intake system provided downstream of an opening of the recirculation line into the intake line, wherein a charge-air cooler is provided in the intake line downstream of the compressor, wherein the cylinder has at least one inlet opening, and wherein in an installed position of the internal combustion engine, the charge-air cooler is arranged above the at least one inlet opening of the cylinder, wherein a geodetic height in the intake system decreases continuously in a flow direction proceeding from an inlet of the charge-air cooler into the charge-air cooler toward the at least one inlet opening of the cylinder, wherein the sensor is arranged between the compressor and the charge-air cooler.

### Claim 7 (depends on 6)

The supercharged internal combustion engine as claimed in claim 6, wherein a shut-off element for adjusting a recirculation rate is arranged in the recirculation line.

### Claim 8 (depends on 6)

The supercharged internal combustion engine as claimed in claim 6, wherein the sensor is arranged downstream of the compressor in the intake system.

### Claim 9 (depends on 6)

The supercharged internal combustion engine as claimed in claim 6, further comprising an additional exhaust-gas recirculation arrangement comprising a line which branches off from the exhaust line upstream of the turbine and opens into the intake system downstream of the compressor.

### Claim 10 (depends on 9)

The supercharged internal combustion engine as claimed in claim 9, in which the charge-air cooler is provided in the intake line downstream of the compressor, and wherein the intake line opens into the intake system downstream of the charge-air cooler.

### Claim 11 (depends on 10)

The supercharged internal combustion engine as claimed in claim 10, wherein the sensor is arranged downstream of an opening of the intake line into the intake system.

### Claim 12 (depends on 6)

The supercharged internal combustion engine as claimed in claim 6, wherein the sensor is an O2 sensor and wherein the component i is oxygen (O2) in the charge air.