Method and device for operating an internal combustion engine

Details Method and device for operating an internal combustion engine Method and device for operating an internal combustion engine

2011-07-19

2011-07-19

Wolfe, Jr., Willis R (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C701S108000, C123S568120, C123S568160, C060S605200, C073S114690, C073S114740, C165S011100, C165S052000

Reexamination Certificate

active

07983834

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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