公开(公告)号：US10119887B2

公开(公告)日：2018-11-06

申请号：US15392308

申请日：2016-12-28

申请人： FUJI JUKOGYO KABUSHIKI KAISHA

发明人： Masaki Kuhara

IPC分类号： G01M15/04 ,  F01P11/16

摘要： A thermostat malfunction detection device that detects a stuck open state of a thermostat includes: an estimated water temperature calculation module that calculates an estimated water temperature of a cooling water based on an operation state of an engine; an actual water temperature detection unit that detects an actual water temperature of the cooling water; a first determination module that establishes preliminary determination when an amount of change of a difference between the estimated water temperature and the actual water temperature within a determined period is equal to or larger than a first threshold value; a passing air amount control module that increases a passing air amount, when the preliminary determination is established; and a second determination module that establishes malfunction determination, when the difference is equal to or larger than a second threshold value, after the passing air amount has been increased.