Method for determination of composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation and correspondingly configured control system for an internal combustion engine
First Claim
1. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
- mixing fresh air with the exhaust of an internal combustion engine wherein the exhaust is recirculated via the exhaust gas recirculation at a mixing site,feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, anddetermining the filling of the combustion chamber of the internal combustion engine by simulation which determines a total mass of the gas mixture in the combustion chamber of the internal combustion engine as a function of the pressure and temperature of the gas mixture in front of the internal combustion engine using coefficients that are dependent on the speed of the internal combustion engine wherein the coefficients are determined by quadratic polynomials as a function of the speed of the internal combustion engine.
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Accused Products
Abstract
An engine management system uses physically based models to determine the composition and mass of the fresh air/exhaust gas mixture suctioned by an internal combustion engine. The models are closely coupled to each other in a partial manner and are used to simulate the filling of the combustion chamber with the suctioned fresh air/waste gas mixture in order to simulate the flow of the mass of re-circulating exhaust gas, the behavior of the exhaust gas manifold upstream and downstream from a turbine, the storage behavior of the intake manifold, and the behavior of the intake pipe or inlet manifold whereby the fresh air/exhaust gas mixture is fed to the combustion engine from a corresponding mixing point where the suctioned fresh air is mixed with the exhaust gas re-circulated via the exhaust gas re-circulation line. As a result, a plurality of additional state variables can be determined without additional sensors.
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Citations
72 Claims
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1. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine wherein the exhaust is recirculated via the exhaust gas recirculation at a mixing site, feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determining the filling of the combustion chamber of the internal combustion engine by simulation which determines a total mass of the gas mixture in the combustion chamber of the internal combustion engine as a function of the pressure and temperature of the gas mixture in front of the internal combustion engine using coefficients that are dependent on the speed of the internal combustion engine wherein the coefficients are determined by quadratic polynomials as a function of the speed of the internal combustion engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine wherein the exhaust is recirculated via the exhaust gas recirculation at a mixing site, feeding the gas mixture resulting from the mixing to the combustion chamber of the internal combustion engine, and simulating a behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine by determining an exhaust gas temperature in front of the turbine as a function of the fuel mass injected in the combustion chamber of the internal combustion engine and the speed of the internal combustion engine, wherein, for determination of the exhaust gas temperature in front of the turbine, a temperature change, referred to the temperature of the gas mixture between the mixing site and the internal combustion engine, is determined as a function of the injected fuel mass and the speed of the internal combustion engine. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine wherein the exhaust is recirculated via the exhaust gas recirculation at a mixing site, feeding the gas mixture resulting from the mixing to the combustion chamber of the internal combustion engine, and simulating a behavior of a connection leading from the mixing site to the internal combustion engine, which supplies the combustion chamber of the internal combustion engine with the gas mixture from the mixing site wherein a fresh air mass and an exhaust gas mass in the connection is determined by time integration of the difference between a fresh air mass flow fed to the connection and a fresh air mass steam fed from the connection to the internal combustion engine or by time integration of a difference between an exhaust gas mass flow fed to the connection via the exhaust gas recirculation and an exhaust gas mass flow fed from the connection to the internal combustion engine, wherein the fresh air mass in the connection and the exhaust gas mass in the connection are determined as follows as a function of the fresh air mass flow fed to the connection, the exhaust gas mass flow fed to the connection, the fresh air mass steam fed from the connection to the internal combustion engine and the exhaust gas mass flow fed from the connection to the internal combustion engine; - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determining the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate the behavior of the internal combustion engine with reference to the state quantity being determined, wherein the filling of the combustion chamber of the internal combustion engine is simulated with a model by the gas mixture fed from the mixing site, by the model, a total mass of the gas mixture in the combustion chamber of the internal combustion engine is determined as a function of the pressure and temperature of the gas mixture in front of the internal combustion engine, the total mass of the gas mixture in the combustion chamber of the internal combustion engine is determined by a linear approach as a function of the pressure and temperature of the gas mixture in front of the internal combustion engine, and during determination of the total mass as a function of the pressure and the temperature in front of the internal combustion engine, a correction factor is used in the linear approach for adaptation models to the actual behavior of internal combustion engine.
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61. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determining the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate a behavior of the internal combustion engine with reference to the state quantity being determined, wherein by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, by a model, a speed of an exhaust gas turbo-supercharger shaft connected to the turbine and a compressor connected to the internal combustion engine are determined as a function of a fresh air mass flow flowing through the compressor and a pressure ratio over the compressor, and for determination of the pressure ratio over the compressor, a pressure in front of the compressor is determined from the atmospheric pressure, a measured fresh air mass flow and an atmospheric temperature, as well as a pressure after the compressor from a charge pressure, with which the fresh air is fed to the mixing site from the compressor, the measured fresh air mass flow and a charge temperature, with which the fresh air is fed to the mixing site from the compressor.
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62. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determining the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate a behavior of the internal combustion engine with reference to the state quantity being determined, wherein, by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, an exhaust gas counterpressure behind the turbine is derived by a model from a pressure difference value that denotes the difference between the exhaust gas counterpressure behind the turbine and an atmospheric pressure, the pressure difference value is determined as a function of exhaust gas mass flow through turbine, and the pressure difference value is determined as a function of the exhaust gas mass flow through the turbine which has been corrected by multiplication by a factor that corresponds to the square root of exhaust gas temperature after turbine.
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63. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determining the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate a behavior of the internal combustion engine with reference to the state quantity being determined, wherein by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, an exhaust gas counterpressure in front of the turbine is determined from an exhaust gas counterpressure after the turbine, an exhaust gas mass flow flowing through the turbine, a blade path of the turbine and a speed of an exhaust gas turbo-supercharger shaft coupled to the turbine, and the exhaust gas counterpressure in front of the turbine is determined from the exhaust gas counterpressure after the turbine, the exhaust gas mass flow through the turbine, the blade path of the turbine and the speed of the exhaust gas turbo-supercharger shaft, as follows;
pvT=Z·
pnT with
Z=b0+b1·
dmT+b2·
(s−
0,5)
+b3·
s2+b4·
(nATL−
0,5)2
+b5·
(dmT+0,5)·
(s+0,5)
+b6·
(dmT−
0,5)·
s2
+b7·
(s−
1)·
(nATL−
0,5)2
+b8·
(s−
1)·
(s−
0,5)2
+b9·
(dmT−
1)2
+b10·
(dmT−
1)·
(dmT+0,5)2·
dmT
+b11·
[(dmT−
1)·
(s−
0,5)3−
0,5]·
b12
+b13,in which b0–
b13 denotes coefficients.
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64. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determining the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate a behavior of the internal combustion engine with reference to the state quantity being determined, wherein by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, by a model, an exhaust gas counterpressure of the exhaust recirculated via the exhaust gas recirculation is determined as a function of an exhaust gas recirculation mass flow flowing through the exhaust gas recirculation, an exhaust gas temperature in front of the turbine and an exhaust gas counterpressure of the exhaust ejected by the internal combustion engine in front of the turbine.
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65. A method for determination of the composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation, comprising the steps of:
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mixing fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feeding the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determining the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate a behavior of the internal combustion engine with reference to the state quantity being determined wherein by a model, the behavior of a connection leading from mixing site to the internal combustion engine, which supplies the combustion chamber of internal combustion engine with the gas mixture from mixing site, is simulated, by a model, a temperature of the gas mixture fed via the connection to the combustion chamber of internal combustion engine is determined, a fresh air mass and an exhaust gas mass in the connection is determined by time integration of the difference between a fresh air mass flow fed to the connection and a fresh air mass steam fed from the connection to the internal combustion engine or by time integration of a difference between an exhaust gas mass flow fed to the connection via the exhaust gas recirculation and an exhaust gas mass flow fed from the connection to the internal combustion engine, and wherein, by a model, the temperature of the gas mixture fed via the connection to the combustion chamber of internal combustion engine is determined as a function of the exhaust gas mass in the connection, a temperature of the exhaust gas recirculation mass flow fed via the exhaust gas recirculation, the fresh air mass in the connection and a temperature of the fresh air mass flow fed to the connection, and the temperature of the gas mixture in the connection is determined as follows as a function of the exhaust gas recirculation mass in the connection, the temperature of the exhaust gas recirculation mass flow, the fresh air mass in the connection and the temperature of the supplied fresh air mass flow;
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66. A control system for an internal combustion engine with exhaust gas recirculation, comprising:
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means for mixing fresh air with an exhaust of the internal combustion engine at a mixing site, an exhaust gas recirculation for recirculating the exhaust, and means for feeding a resulting gas mixture to a combustion chamber of internal combustion engine, wherein the control system automatically determines the filling of the combustion chamber of the internal combustion engine by simulation which determines a total mass of the gas mixture in the combustion chamber of the internal combustion engine as a function of the pressure and temperature of the gas mixture in front of the internal combustion engine using coefficients that are dependent on the speed of the internal combustion engine wherein the coefficients are determined by quadratic polynomials as a function of the speed of the internal combustion engine.
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67. A control system for an internal combustion engine with exhaust gas recirculation, comprising:
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means for mixing fresh air with an exhaust of the internal combustion engine at a mixing site, an exhaust gas recirculation for recirculating the exhaust, and means for feeding a resulting gas mixture to a combustion chamber of internal combustion engine, wherein the control system controls the internal combustion engine to; mix fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at the mixing site, feed the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determines the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate the behavior of the internal combustion engine with reference to the state quantity being determined, further comprising a physically based model, which simulates the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, and model means, which determine a speed of an exhaust gas turbo-supercharger shaft connected to the turbine and a compressor connected to the internal combustion engine as a function of a fresh air mass flow flowing through the compressor and a pressure ratio over the compressor, and wherein the control system for determination of the pressure ratio over the compressor, determines a pressure in front of the compressor from the atmospheric pressure, a measured fresh air mass flow and an atmospheric temperature, as well as a pressure after the compressor from a charge pressure, with which the fresh air is fed to the mixing site from the compressor, the measured fresh air mass flow and a charge temperature, with which the fresh air is fed to the mixing site from the compressor.
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68. A control system for an internal combustion engine with exhaust gas recirculation, comprising:
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means for mixing fresh air with an exhaust of the internal combustion engine at a mixing site, an exhaust gas recirculation for recirculating the exhaust, and means for feeding a resulting gas mixture to a combustion chamber of internal combustion engine, wherein the control system controls the internal combustion engine to; mix fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feed the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determines the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate the behavior of the internal combustion engine with reference to the state quantity being determined, wherein by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, by a model, a speed of an exhaust gas turbo-supercharger shaft connected to the turbine and a compressor connected to the internal combustion engine are determined as a function of a fresh air mass flow flowing through the compressor and a pressure ratio over the compressor, and for determination of the pressure ratio over the compressor, a pressure in front of the compressor is determined from the atmospheric pressure, a measured fresh air mass flow and an atmospheric temperature, as well as a pressure after the compressor from a charge pressure, with which the fresh air is fed to the mixing site from the compressor, the measured fresh air mass flow and a charge temperature, with which the fresh air is fed to the mixing site from the compressor.
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69. A control system for an internal combustion engine with exhaust gas recirculation, comprising:
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means for mixing fresh air with an exhaust of the internal combustion engine at a mixing site, an exhaust gas recirculation for recirculating the exhaust, and means for feeding a resulting gas mixture to a combustion chamber of internal combustion engine, wherein the control system controls the internal combustion engine to mix fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feed the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determines the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate a behavior of the internal combustion engine with reference to the state quantity being determined, wherein by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, derives an exhaust gas counterpressure behind the turbine by a model from a pressure difference value that denotes the difference between the exhaust gas counterpressure behind the turbine and an atmospheric pressure, determines the pressure difference value as a function of exhaust gas mass flow through turbine, and determines the pressure difference value as a function of the exhaust gas mass flow through the turbine which has been corrected by multiplication by a factor that corresponds to the square root of exhaust gas temperature after turbine.
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70. A control system for an internal combustion engine with exhaust gas recirculation, comprising:
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means for mixing fresh air with an exhaust of the internal combustion engine at a mixing site, an exhaust gas recirculation for recirculating the exhaust, and means for feeding a resulting gas mixture to a combustion chamber of internal combustion engine, wherein the control system controls the internal combustion engine to; mix fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feed the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determines the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate the behavior of the internal combustion engine with reference to the state quantity being determined, wherein by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, an exhaust gas counterpressure in front of the turbine is determined from an exhaust gas counterpressure after the turbine, an exhaust gas mass flow flowing through the turbine, a blade path of the turbine and a speed of an exhaust gas turbo-supercharger shaft coupled to the turbine, and the exhaust gas counterpressure in front of the turbine is determined from the exhaust gas counterpressure after the turbine, the exhaust gas mass flow through the turbine, the blade path of the turbine and the speed of the exhaust gas turbo-supercharger shaft, as follows;
pvT=Z·
pnT with
Z=b0+b1·
dmT+b2·
(s−
0,5)
+b3·
s2+b4·
(nATL−
0,5)2
+b5·
(dmT+0,5)·
(s+0,5)
+b6·
(dmT−
0,5)·
s2
+b7·
(s−
1)·
(nATL−
0,5)2
+b8·
(s−
1)·
(s−
0,5)2
+b9·
(dmT−
1)2
+b10·
(dmT−
1)·
(dmT+0,5)2·
dmT
+b11·
[(dmT−
1)·
(s−
0,5)3−
0,5]·
b12
+b13,in which b0–
b13 denotes coefficients.
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71. A control system for an internal combustion engine with exhaust gas recirculation, comprising:
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means for mixing fresh air with an exhaust of the internal combustion engine at a mixing site, an exhaust gas recirculation for recirculating the exhaust, and means for feeding a resulting gas mixture to a combustion chamber of internal combustion engine, wherein the control system controls the internal combustion engine to; mix fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feed the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determines the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate the behavior of the internal combustion engine with reference to the state quantity being determined, wherein by a physically based model, the behavior of an exhaust line of the internal combustion engine, before and after a turbine connected to the internal combustion engine, is simulated, by a model, an exhaust gas counterpressure of the exhaust recirculated via the exhaust gas recirculation is determined as a function of an exhaust gas recirculation mass flow flowing through the exhaust gas recirculation, an exhaust gas temperature in front of the turbine and an exhaust gas counterpressure of the exhaust ejected by the internal combustion engine in front of the turbine.
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72. A control system for an internal combustion engine with exhaust gas recirculation, comprising:
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means for mixing fresh air with an exhaust of the internal combustion engine at a mixing site, an exhaust gas recirculation for recirculating the exhaust, and means for feeding a resulting gas mixture to a combustion chamber of internal combustion engine, wherein the control system controls the internal combustion engine to; mix fresh air with the exhaust of an internal combustion engine recirculated via the exhaust gas recirculation and at a mixing site, feed the gas mixture resulting from the mixing site to the combustion chamber of the internal combustion engine, and determines the composition of the gas mixture in the combustion chamber of the internal combustion engine by determination of corresponding state quantities of the internal combustion engine by using corresponding physically based models that simulate the behavior of the internal combustion engine with reference to the state quantity being determined wherein by a model, the behavior of a connection leading from mixing site to the internal combustion engine, which supplies the combustion chamber of internal combustion engine with the gas mixture from mixing site, is simulated, by a model, a temperature of the gas mixture fed via the connection to the combustion chamber of internal combustion engine is determined, a fresh air mass and an exhaust gas mass in the connection is determined by time integration of the difference between a fresh air mass flow fed to the connection and a fresh air mass steam fed from the connection to the internal combustion engine or by time integration of a difference between an exhaust gas mass flow fed to the connection via the exhaust gas recirculation and an exhaust gas mass flow fed from the connection to the internal combustion engine, and wherein, by a model, the temperature of the gas mixture fed via the connection to the combustion chamber of internal combustion engine is determined as a function of the exhaust gas mass in the connection, a temperature of the exhaust gas recirculation mass flow fed via the exhaust gas recirculation, the fresh air mass in the connection and a temperature of the fresh air mass flow fed to the connection, and the temperature of the gas mixture in the connection is determined as follows as a function of the exhaust gas recirculation mass in the connection, the temperature of the exhaust gas recirculation mass flow, the fresh air mass in the connection and the temperature of the supplied fresh air mass flow;
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Specification