Method and device for controlling the exhaust gas recirculation in an internal-combustion engine based on the measurement of the oxygen concentration in the gaseous mixture taken in by the engine
First Claim
1. A device for controlling the exhaust gas recirculation in an internal-combustion engine (1), said engine (1) being provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5);
- said device being characterized in that it comprises measuring means (25) for measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine; and
control means (29) connected to said measuring means (25) and to the exhaust-gas-recirculation system (5) for controlling the exhaust gas recirculation on the basis of the oxygen concentration in the mixture taken in by the engine (1).
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Accused Products
Abstract
A method and a device for controlling the exhaust gas recirculation in an internal-combustion engine (1) are described herein. The engine (1) is provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5). A linear oxygen sensor (25) is arranged along the air-intake system (2) in a section traversed, in use, by the air/recirculated-exhaust-gas mixture, for measuring the oxygen concentration in the mixture itself. An electronic control unit is connected to the oxygen sensor (25) and to the exhaust-gas-recirculation system (5) for controlling the flow rate of recirculated exhaust gases on the basis of the oxygen concentration in the mixture taken in by the engine (1). In particular, the oxygen sensor is a UHEGO probe (25).
42 Citations
50 Claims
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1. A device for controlling the exhaust gas recirculation in an internal-combustion engine (1), said engine (1) being provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5);
- said device being characterized in that it comprises measuring means (25) for measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine; and
control means (29) connected to said measuring means (25) and to the exhaust-gas-recirculation system (5) for controlling the exhaust gas recirculation on the basis of the oxygen concentration in the mixture taken in by the engine (1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- said device being characterized in that it comprises measuring means (25) for measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine; and
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13. A method for controlling the exhaust gas recirculation in an internal-combustion engine (1), said engine (1) being provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5);
- said method being characterized by comprising the steps of;
measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine; and
controlling the exhaust gas recirculation on the basis of the oxygen concentration in the mixture taken in by the engine (1). - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
- said method being characterized by comprising the steps of;
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22. A device for determining the oxygen concentration in the mixture taken in by an internal-combustion engine (1), said engine (1) being provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5);
- characterized in that it comprises measuring means (25) for measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine.
- View Dependent Claims (23, 24, 25, 47, 48, 49, 50)
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26. A method for determining the oxygen concentration in an internal-combustion engine (1), said engine (1) being provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5);
- characterized in that it comprises the step of;
measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine. - View Dependent Claims (27, 28, 29)
- characterized in that it comprises the step of;
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30. A device for determining the flow rate of air taken into an internal-combustion engine (1), said engine (1) being provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5), characterized in that it comprises:
- measuring means (25) for measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine; and
determining means (29) for determining the flow rate ({dot over (M)}fresh— air) of air taken in by the engine connected to said measuring means (25) for calculating the flow rate ({dot over (M)}fresh— air) of air taken in by the engine as a function of the oxygen concentration in the mixture taken in by the engine (1). - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39)
- measuring means (25) for measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine; and
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40. A method for determining the flow rate of air taken into an internal-combustion engine (1), said engine (1) being provided with an air-intake system (2), a gas-exhaust system (4), and an exhaust-gas-recirculation system (5);
- characterized in that it comprises the steps of;
measuring the oxygen concentration in the air/recirculated-exhaust-gas mixture taken in by the engine; and
determining the flow rate ({dot over (M)}fresh — air) of air taken in by the engine (1) as a function of the oxygen concentration in the mixture taken in by the engine. - View Dependent Claims (41, 42, 43, 44, 45, 46)
- characterized in that it comprises the steps of;
Specification