# US 10,480,432 B2 · Exhaust gas recirculation valves for a forced-induction internal combustion engine with exhaust gas recirculation

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- Number: US 10,480,432 B2
- Document ID: US10480432B2
- Status: Granted
- Kind: B2
- Application number: 15/507,451
- Filed: 2015-08-10
- Published: 2017-10-05
- Granted: 2019-11-19
- Earliest claimed: 2014-09-03
- Assignees: Continental Automotive GmbH
- Applicants: Continental Automotive GmbH
- Inventors: Hong Zhang
- Web page: https://patentgrep.com/patent/US10480432B2

## CPC

- F02D 41/0047: {Controlling exhaust gas recirculation [EGR] (temperature control with cooler in recirculation circuit F02M26/33)}
- F02D 21/08: the other gas being the exhaust gas of engine
- F02D 23/00: Controlling engines characterised by their being supercharged
- F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)}
- F02D 41/10: for acceleration
- F02D 43/04: using only digital means
- F02D 2200/0406: Intake manifold pressure
- F02D 2200/602: Pedal position
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present disclosure relates to internal combustion engines. The teachings thereof may be embodied in methods and devices for actuating an exhaust gas recirculation valve of a forced-induction internal combustion engine with exhaust gas recirculation. A method for building up the charge pressure required to avoid a drop in torque may include: detecting an acceleration indicator; in response, providing an increased target value for an exhaust gas recirculation rate; measuring an instantaneous actual charge pressure; determining a setpoint exhaust gas recirculation rate based on the increased target value, the instantaneous setpoint charge pressure, and the instantaneous actual charge pressure; calculating a control signal using the determined setpoint exhaust gas recirculation rate; and delivering the control signal to the exhaust gas recirculation valve to change its opening state.

## Claims

### Claim 1

A method for building up the charge pressure required to avoid a drop in torque of an internal combustion engine having an exhaust gas turbocharger, which has a fresh air inlet duct, an exhaust gas recirculation duct with an exhaust gas recirculation valve, and a mixer, the method including:
detecting an actuation of an accelerator pedal;
determining a target value for an exhaust gas recirculation rate in response to the actuation of the accelerator pedal;
measuring an instantaneous actual charge pressure;
determining a setpoint exhaust gas recirculation rate based on the target value for the exhaust gas recirculation rate, a setpoint charge pressure corresponding to the target value for the exhaust gas recirculation rate, and the measured instantaneous actual charge pressure;
calculating a control signal corresponding to an actuating variable for the exhaust gas recirculation valve, using the determined setpoint exhaust gas recirculation rate; and
delivering the control signal to the exhaust gas recirculation valve to change an opening state of the exhaust gas recirculation valve;
wherein the target value for the exhaust gas recirculation rate is predefined in dependence on a setpoint air mass and an instantaneous rotation speed of a shaft of the exhaust gas turbocharger.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the setpoint exhaust gas recirculation rate is calculated according to the following relation:
eta_egr_soll=1−(1−eta_egr_soll_0)·(P_lade_soll/P_lade_ist), where
eta_egr_soll is the setpoint exhaust gas recirculation rate,
eta_egr_soll_0 is the target value for the exhaust gas recirculation rate,
P_lade_soll is the setpoint charge pressure, and
P_lade_ist is the measured instantaneous actual charge pressure.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the actuating variable for the exhaust gas recirculation valve depends at least in part on the determined setpoint exhaust gas recirculation rate and a stored characteristic curve for the exhaust gas recirculation valve.

### Claim 4 (depends on 2)

The method as claimed in claim 2, further comprising: determining the actuating variable for the exhaust gas recirculation valve if the target value for the exhaust gas recirculation rate exceeds an actual exhaust gas recirculation rate by a predefined difference value.

### Claim 5 (depends on 4)

The method as claimed in claim 4, wherein the setpoint exhaust gas recirculation rate is made equal to the target value for the setpoint exhaust gas recirculation rate when the target value for the exhaust gas recirculation rate does not exceed the instantaneous exhaust gas recirculation rate by the predefined difference value.

### Claim 6

A device for building up the charge pressure required to avoid a drop in torque of an internal combustion engine, the device comprising:
an exhaust gas turbocharger with a turbine and a compressor connected to the turbine by a shaft;
an exhaust gas duct connected to an outlet of the turbine;
an exhaust gas recirculation duct branching off from the exhaust gas duct with an exhaust gas recirculation duct outlet connected to a first inlet of a mixer with a mixer outlet connected to an inlet of the compressor;
an exhaust gas recirculation valve in the exhaust gas recirculation duct;
a fresh air inlet duct with an outlet connected to a second inlet of the mixer; and
a control unit to prepare actuation signals for the exhaust gas recirculation valve;
wherein the control unit:
detects an actuation of an accelerator pedal;
determines a target value for an exhaust gas recirculation rate in response to the actuation of the accelerator pedal;
measures an instantaneous actual charge pressure;
determines a setpoint exhaust gas recirculation rate based on the target value for the exhaust gas recirculation rate, a setpoint charge pressure corresponding to the target value for the exhaust gas recirculation rate, and the instantaneous actual charge pressure;
calculates a control signal corresponding to an actuating variable for the exhaust gas recirculation valve, using the determined setpoint exhaust gas recirculation rate; and
delivers the control signal to the exhaust gas recirculation valve to change an opening state of the exhaust gas recirculation valve;
wherein the setpoint exhaust gas recirculation rate is calculated according to the following relation:
eta_egr_soll=1−(1−eta_egr_soll_0)(P_lade_soll/P_lade_ist), where
eta_egr_soll is the setpoint exhaust gas recirculation rate,
eta_egr_soll_0 is the target value for the exhaust gas recirculation rate,
P_lade_soll is the setpoint charge pressure, and
P_lade_ist is the measured instantaneous actual charge pressure.

### Claim 7

A method for building up the charge pressure required to avoid a drop in torque of an internal combustion engine having an exhaust gas turbocharger, which has a fresh air inlet duct, an exhaust gas recirculation duct with an exhaust gas recirculation valve, and a mixer, the method including:
detecting an actuation of an accelerator pedal;
determining a target value for an exhaust gas recirculation rate in response to the actuation of the accelerator pedal;
measuring an instantaneous actual charge pressure;
determining a setpoint exhaust gas recirculation rate based on the target value for the exhaust gas recirculation rate, a setpoint charge pressure corresponding to the target value for the exhaust gas recirculation rate, and the measured instantaneous actual charge pressure;
calculating a control signal corresponding to an actuating variable for the exhaust gas recirculation valve, using the determined setpoint exhaust gas recirculation rate; and
delivering the control signal to the exhaust gas recirculation valve to change an opening state of the exhaust gas recirculation valve;
wherein the setpoint exhaust gas recirculation rate is calculated according to the following relation:
eta_egr_soll=1−(1−eta_egr_soll_0)(P_lade_soll/P_lade_ist), where
eta_egr_soll is the setpoint exhaust gas recirculation rate,
eta_egr_soll_0 is the target value for the exhaust gas recirculation rate,
P_lade_soll is the setpoint charge pressure, and
P_lade_ist is the measured instantaneous actual charge pressure.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein the actuating variable for the exhaust gas recirculation valve depends at least in part on the determined setpoint exhaust gas recirculation rate and a stored characteristic curve for the exhaust gas recirculation valve.

### Claim 9 (depends on 7)

The method as claimed in claim 7, further comprising determining the actuating variable for the exhaust gas recirculation valve if the target value for the exhaust gas recirculation rate exceeds an actual exhaust gas recirculation rate by a predefined difference value.

### Claim 10 (depends on 9)

The method as claimed in claim 9, wherein the setpoint exhaust gas recirculation rate is made equal to the target value for the setpoint exhaust gas recirculation rate when the exhaust gas recirculation rate does not exceed the instantaneous exhaust gas recirculation rate by the predefined difference value.