IP Library › Granted Patent US 7,581,532
Granted Patent B2
US 7,581,532 · App. 10/568,407 · Granted Sep 1, 2009

Method for recirculating a partial exhaust gas flow to an internal combustion engine of a motor vehicle

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Quick Facts
Patent No.
US 7,581,532
App. No.
10/568,407
Granted
Sep 1, 2009
Kind
B2
Abstract

In the present method, a partial flow is guided through a partial flow line connected downstream of an exhaust gas outlet of an internal combustion engine, and is immediately thereafter supplied to an internal combustion engine either via a first valve, a bypass line which is connected directly downstream and a recirculation line. Alternatively, the partial exhaust gas flow can be supplied to the internal combustion engine via a second valve, a radiator which is connected directly downstream and a recirculation line. The first valve and the second valve are opened or closed as a function of the exhaust gas conditions, this being monitored by a sensor. A device for carrying out the method is also disclosed.

Claims (16)

1. A method for recirculating a partial exhaust gas flow to an internal combustion engine of a motor vehicle, comprising the steps of:

guiding the partial flow though a partial flow line connected downstream of an exhaust gas outlet of the internal combustion engine,

supplying the partial flow immediately thereafter to the internal combustion engine either via a first valve, a bypass line which is connected directly downstream and a recirculation line or via a second valve, a radiator which is connected directly downstream and a recirculation line,

opening or closing the first valve and the second valve as a function of the exhaust gas conditions, and

monitoring the opening and closing with a sensor.

2. The method according claim 1 , wherein the partial flow is guided through a valve unit which comprises the first valve, the second valve and the sensor.

3. The method according to claim 2 , wherein the partial flow downstream of the second valve is guided through a radiator, arranged as the radiator which is connected downstream, having liquid coolant, the liquid coolant being guided both through the radiator which is connected downstream and through the valve unit.

4. A device for recirculating a partial exhaust gas flow to an internal combustion engine of a motor vehicle,

a partial flow line;

a first and second valve connected to the partial flow line;

a recirculation line connected to the first valve by means of a bypass line;

a radiator arranged to connect the second valve directly downstream to the recirculation line, and

a sensor to monitor actuation of the first valve and of the second valve as a function of the exhaust gas conditions.

5. The device according to claim 4 , wherein the radiator includes liquid coolant and is arranged downstream.

6. The device according to claim 5 , further comprising a valve unit including the first valve, the second valve and the sensor.

7. The device according to claim 6 , wherein the radiator is connected downstream and comprises a coolant inlet and the valve unit comprises a coolant outlet.