Method and apparatus for diagnosing a coolant pump for an internal combustion engine
AssigneeAudi AG
InventorJohann Graf
Life of this patent
Estimating the term…
Abstract
In a method and a device for diagnosing a switchable coolant pump for circulating a coolant in a coolant circuit of an internal combustion engine, an actual value of the cylinder head temperature of the internal combustion engine is measured and the actual value of the cylinder head temperature is compared with a model value of the cylinder head temperature. The functionality of the coolant pump is assessed according to the comparison result.
Claims12
1-11. (canceled)
A method for diagnosing a switchable coolant pump for circulating a coolant in a coolant circuit of an internal combustion engine, comprising:
- measuring an actual value of a cylinder head temperature of the internal combustion engine,
- comparing the actual value of the cylinder head temperature with a model value of the cylinder head temperature which is computed based on at least one operating variable of the internal combustion engine either continuously from an actual value of the coolant temperature of the internal combustion engine or from a stored characteristic curve commensurate with the at least one operating variable, and
- assessing the functionality of the coolant pump based on a result of the comparison.
An apparatus for diagnosing a switchable coolant pump for circulating a coolant in a coolant circuit of an internal combustion engine, comprising:
- a first temperature sensor for measuring an actual value of a cylinder head temperature of the internal combustion engine,
- a second temperature sensor for measuring a coolant temperature of the internal combustion engine,
- an evaluation device configured to compare the measured actual value of the cylinder head temperature with a model value of the cylinder head temperature that is computed from an actual value of the coolant temperature measured with the second temperature sensor and from at least one operating variable of the internal combustion engine determined with an engine management unit, and to assess the functionality of the coolant pump based on a result of the comparison.
Dependencies are inferred from the claim text.