METHOD AND DEVICE FOR MONITORING ERRORS IN AN EXHAUST GAS RECIRCULATION SYSTEM
First Claim
1. A method for monitoring errors in a low-pressure exhaust gas recirculation line of an internal combustion engine, the internal combustion engine being supplied with fresh air via an air supply duct with a compressor of a turbocharger, exhaust gas of the internal combustion engine being discharged via an exhaust duct with an exhaust gas turbine of the turbocharger, a subflow of the exhaust gas being supplied from an exhaust gas low-pressure area of the exhaust duct downstream from the exhaust gas turbine of the turbocharger, via the low-pressure exhaust gas recirculation line, to an intake air low-pressure area of the air supply duct upstream from the compressor of the turbocharger, the method comprising:
- setting an exhaust gas mass flow of the subflow of the exhaust gas in the low-pressure exhaust gas recirculation line via a low-pressure exhaust gas recirculation valve, setting a fresh air mass flow being set by a fresh air throttle provided in the air supply duct, or an exhaust gas mass flow via an exhaust flap in the exhaust duct;
in operating points of the internal combustion engine in which the fresh air throttle or the exhaust flap is opened when the low-pressure exhaust gas recirculation line is free of errors, deducing an error in the low-pressure exhaust gas recirculation line if the fresh air throttle or the exhaust flap is at least partially closed.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and device for monitoring errors in an exhaust gas recirculation line, including supplying an engine with fresh air via a supply duct using a compressor, discharging exhaust gas via an exhaust duct using a gas turbine, a subflow of the gas being supplied from a low-pressure area of the exhaust duct downstream from the turbine, via the recirculation line, to an intake air low-pressure area of the supply duct upstream from the compressor, an exhaust gas mass flow of the subflow in the recirculation line is set via a valve, a fresh air mass flow being set by a fresh air throttle, or via an exhaust flap in the exhaust duct. Where the fresh air throttle or the exhaust flap is opened when the recirculation line is free of errors, an error in the recirculation line is deduced if the throttle or flap is at least partially closed.
22 Citations
8 Claims
-
1. A method for monitoring errors in a low-pressure exhaust gas recirculation line of an internal combustion engine, the internal combustion engine being supplied with fresh air via an air supply duct with a compressor of a turbocharger, exhaust gas of the internal combustion engine being discharged via an exhaust duct with an exhaust gas turbine of the turbocharger, a subflow of the exhaust gas being supplied from an exhaust gas low-pressure area of the exhaust duct downstream from the exhaust gas turbine of the turbocharger, via the low-pressure exhaust gas recirculation line, to an intake air low-pressure area of the air supply duct upstream from the compressor of the turbocharger, the method comprising:
-
setting an exhaust gas mass flow of the subflow of the exhaust gas in the low-pressure exhaust gas recirculation line via a low-pressure exhaust gas recirculation valve, setting a fresh air mass flow being set by a fresh air throttle provided in the air supply duct, or an exhaust gas mass flow via an exhaust flap in the exhaust duct; in operating points of the internal combustion engine in which the fresh air throttle or the exhaust flap is opened when the low-pressure exhaust gas recirculation line is free of errors, deducing an error in the low-pressure exhaust gas recirculation line if the fresh air throttle or the exhaust flap is at least partially closed. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A device for monitoring errors in a low-pressure exhaust gas recirculation line of an internal combustion engine, an air supply duct having a compressor of a turbocharger for supplying fresh air to the internal combustion engine, an exhaust duct being provided with an exhaust gas turbine of the turbocharger for discharging exhaust gas of the internal combustion engine, the low-pressure exhaust gas recirculation line being provided downstream from the exhaust gas turbine of the turbocharger for withdrawing a subflow of the exhaust gas from an exhaust gas low-pressure area of the exhaust duct and for supplying the subflow of the exhaust gas to an intake air low-pressure area of the air supply duct upstream from the compressor of the turbocharger, a low-pressure exhaust gas recirculation valve being provided in the low-pressure exhaust gas recirculation line for setting an exhaust gas mass flow of the subflow of the exhaust gas, a fresh air throttle being provided in the air supply duct for setting a fresh air mass flow, or an exhaust flap being provided in the exhaust duct for setting an exhaust gas mass flow, comprising:
a control device, for monitoring errors, having a unit for generating an error display, wherein in operating points of the internal combustion engine in which the fresh air throttle or the exhaust flap is open when the low-pressure exhaust gas recirculation line is free of errors, the unit outputs the error display when the fresh air throttle or the exhaust flap is at least partially closed. - View Dependent Claims (8)
Specification