Method and device for operating an internal combustion engine
First Claim
1. A method for detecting an error in a mass flow system of an internal combustion engine, the internal combustion engine having at least one mass flow line, a cooling device adapted to cool a mass flow in the mass flow line, a bypass that bypasses the cooling device, and a bypass valve, the mass flow being conducted at least partly through the bypass when the bypass valve is open, and the mass flow being conducted through the cooling device when the bypass valve is closed, the method comprising:
- determining a temperature of the mass flow in the mass flow line downstream from the cooling device and from the bypass in the mass flow line;
determining in at least one operating state of the internal combustion engine a first temporal temperature gradient with the bypass valve closed;
determining in the at least one operating state of the internal combustion engine a second temporal temperature gradient with the bypass valve in an open position; and
detecting an error as a function of a deviation between the first temporal temperature gradient and the second temporal temperature gradient.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and a device for operating an internal combustion engine having at least one mass flow line and a cooling device for cooling the mass flow in the mass flow line, as well as a bypass, having a bypass valve, that bypasses the cooling device. When the bypass valve is opened, the mass flow is conducted at least partly through the bypass. When the bypass valve is closed, the mass flow is conducted through the cooling device. Downstream from the cooling device and from the bypass in the mass flow line, a temperature of the mass flow in the mass flow line is determined. In at least one operating state of the internal combustion engine, a first temporal temperature gradient is determined with closed bypass valve. In the at least one operating state of the internal combustion engine, a second temporal temperature gradient is determined with closed position of the bypass valve. An error is recognized as a function of a deviation between the first temporal temperature gradient and the second temporal temperature gradient.
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Citations
11 Claims
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1. A method for detecting an error in a mass flow system of an internal combustion engine, the internal combustion engine having at least one mass flow line, a cooling device adapted to cool a mass flow in the mass flow line, a bypass that bypasses the cooling device, and a bypass valve, the mass flow being conducted at least partly through the bypass when the bypass valve is open, and the mass flow being conducted through the cooling device when the bypass valve is closed, the method comprising:
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determining a temperature of the mass flow in the mass flow line downstream from the cooling device and from the bypass in the mass flow line; determining in at least one operating state of the internal combustion engine a first temporal temperature gradient with the bypass valve closed; determining in the at least one operating state of the internal combustion engine a second temporal temperature gradient with the bypass valve in an open position; and detecting an error as a function of a deviation between the first temporal temperature gradient and the second temporal temperature gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for detecting an error in a mass flow system of an internal combustion engine, the internal combustion engine having at least one mass flow line, a cooling device adapted to cool a mass flow in the mass flow line, a bypass that bypasses the cooling device, and a bypass valve, the mass flow being conducted at least partly through the bypass when the bypass valve is open, and the mass flow being conducted through the cooling device when the bypass valve is closed, the device comprising:
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a first determining arrangement adapted to determine, downstream from the cooling device and from the bypass in the mass flow line, a temperature of the mass flow in the mass flow line; a second determining arrangement adapted to determine, in at least one operating state of the internal combustion engine, a first temporal temperature gradient with the bypass valve closed, and to determine, in the at least one operating state of the internal combustion engine, a second temporal temperature gradient with open position of the bypass valve; and a recognition arrangement adapted to recognize an error as a function of a deviation between the first temporal temperature gradient and the second temporal temperature gradient.
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Specification