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US 6,588,380 B2Granted
Cooling system for a motor vehicle comprising a closing unit for the cooling airflow
AssigneeRobert Bosch GmbH
InventorKlaus Ries-Mueller
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AssigneeRobert Bosch GmbH
InventorKlaus Ries-Mueller
Estimating the term…
The invention proposes a cooling system of a motor vehicle, in which a closure unit for the cooling air stream, in order to optimize the operating parameters of the internal combustion engine, is monitored as to its function. This closure unit, preferably a flap or louver for controlling the cooling air stream, is monitored as to its function in order to prevent a temperature buildup or a failure to reach the operating temperature. In order to monitor the position of the closure unit (1), the invention therefore proposes using a temperature sensor that is as a rule present, to compare the progression of the cooling water temperature to a stored model progression of the temperature. If the cooling water temperature lies within a predetermined tolerance range, then the closure unit is functioning properly. Otherwise, it is assumed that the closure unit is jammed.
A cooling system of a motor vehicle, with a closure unit (1) for the cooling air stream (K) in order to optimize the operating parameters of the internal combustion engine (3), having a sensor (6) for detecting the engine temperature (tmot) and a control unit (7) for actuating the closure unit (1) as a function of the engine temperature (tmot), characterized in that the control unit (7) is designed to detect the chronological temperature progression for the cooling water and to compare it to a predetermined model progression, and that the control unit (7) detects a misadjustment of the closure unit (1) from the chronological change of the temperature difference (dt) between the model progression (tmod) and the cooling water temperature progression (tmot).
The cooling system according to one of the preceding claims, characterized in that the closure unit (1) is actuated during a favorable, quasi-stationary operation of the engine.
Dependencies are inferred from the claim text.