| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a failure determination device of a variable water pump that can improve the failure determination precision of the variable water pump. <P>SOLUTION: When the variable water pump is temporarily decided as failed by the difference between the water temperature at the part which easily receives heat from an engine and the water temperature at the part which does not easily receive heat from the engine, the failure determination device controls the clutch part of the variable water pump so that the variable water pump repeats operations and stops under the normal condition of the engine. Then, the failure determination device determines whether there is no engine rotational variation when the variable water pump operation is controlled and the stop is controlled on the basis of the engine rotational frequency. If there is no engine rotational variation, the variable water pump is finally determined as failed. If there is an engine rotational variation, a cooling device component other than the variable water pump is determined as failed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
