- 专利标题: Thermostat malfunction detecting system for engine cooling system
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申请号: US10100039申请日: 2002-03-19
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公开(公告)号: US06679110B2公开(公告)日: 2004-01-20
- 发明人: Tatsuya Oka , Keiji Wakahara , Akira Ichikawa
- 申请人: Tatsuya Oka , Keiji Wakahara , Akira Ichikawa
- 优先权: JP8-336579 19961217; JP8-344749 19961225; JP9-283208 19971016
- 主分类号: G01M1500
- IPC分类号: G01M1500
摘要:
A malfunction of a thermostat in a coolant circulating path is detected from an engine side coolant temperature in consideration of the following behavior of the coolant temperature. When an open-malfunction occurs, the coolant temperature becomes different considerably from that in the normal time in the temperature range in which the thermostat is to be normally closed. When a closure-malfunction occurs, the coolant temperature becomes different considerably from that during the normal time in the temperature range in which the thermostat is to be normally opened. Alternatively, the malfunction may be detected from a difference between the engine side coolant temperature and a radiator side coolant temperature.