| 摘要 |
<P>PROBLEM TO BE SOLVED: To determine an abnormal state certainly only when a cooling system has fallen in an abnormal state not functioning normally. <P>SOLUTION: The liquid circulation control device is provided with a pressure sensor 6 to detect pressure of a cooling liquid, a cooling liquid flow-rate increase part 14 which compares the pressure of the cooling liquid detected with a prescribed pressure diagnostic threshold and increases circulation flow-rate of the cooling liquid according to the comparison result, and a cooling liquid circulation abnormality diagnosing part 23 which determines whether or not the function of the cooling system is in an abnormality state of deterioration based on the comparison result. When the pressure of the cooling liquid detected by the pressure sensor 6 becomes a pressure diagnostic threshold or less, the circulation flow-rate of the cooling liquid is increased and then, the cooling liquid circulation abnormality diagnosing part 23 implements judgement to control. <P>COPYRIGHT: (C)2008,JPO&INPIT |
