Exhaust Heat Recovery System Abnormality Detection Device
First Claim
1. An abnormality detection device detecting whether an exhaust heat recovery system recovering exhaust heat from exhaust gas exhausted from an engine has abnormality, said exhaust heat recovery system including a bypass connected parallel to an exhaust path passing said exhaust gas, an exhaust heat recovery unit provided at said bypass to recover said exhaust heat, and a switching valve switched to pass said exhaust gas through said bypass the abnormality detection device comprising:
- gas temperature detection means disposed at least one of said bypass and said exhaust path for detecting said exhaust gas'"'"'s temperature; and
determination means for determining from said temperature whether said switching valve has abnormality; and
means for detecting said engine'"'"'s rate of rotation, wherein said determination means determines whether said switching valve has abnormality from whether said temperature and said rate of rotation have a relationship corresponding to a predetermined relationship.
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Accused Products
Abstract
An ECU executes a program including the steps of: when a switching valve is controlled to be closed, comparing exhaust gas'"'"'s temperature, as detected, with a map value; if the exhaust gas'"'"'s temperature is larger than the map value, determining that the switching valve normally operates; and if the exhaust gas'"'"'s temperature is smaller than the map value, determining that the switching valve has abnormality.
36 Citations
34 Claims
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1. An abnormality detection device detecting whether an exhaust heat recovery system recovering exhaust heat from exhaust gas exhausted from an engine has abnormality, said exhaust heat recovery system including a bypass connected parallel to an exhaust path passing said exhaust gas, an exhaust heat recovery unit provided at said bypass to recover said exhaust heat, and a switching valve switched to pass said exhaust gas through said bypass the abnormality detection device comprising:
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gas temperature detection means disposed at least one of said bypass and said exhaust path for detecting said exhaust gas'"'"'s temperature; and determination means for determining from said temperature whether said switching valve has abnormality; and means for detecting said engine'"'"'s rate of rotation, wherein said determination means determines whether said switching valve has abnormality from whether said temperature and said rate of rotation have a relationship corresponding to a predetermined relationship.
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2. An abnormality detection device detecting whether an exhaust heat recovery system recovering exhaust heat from exhaust gas exhausted from an engine has abnormality, said exhaust heat recovery system including a bypass connected parallel to an exhaust path passing said exhaust gas, an exhaust heat recovery unit provided at said bypass to recover said exhaust heat, and a switching valve switched to pass said exhaust gas through said bypass, the abnormality detection device comprising:
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gas temperature detection means disposed at least one of said bypass and said exhaust path for detecting said exhaust gas'"'"'s temperature; and determination means for determining from said temperature whether said switching valve has abnormality, wherein said determination means includes means for determining whether said switching valve has abnormality from said temperature'"'"'s variation with time.
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3. (canceled)
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4. An abnormality detection device of an exhaust heat recovery system detecting whether an exhaust heat recovery system recovering exhaust heat from exhaust gas exhausted from an engine has abnormality, said exhaust heat recovery system including a bypass connected parallel to an exhaust path passing said exhaust gas, an exhaust heat recovery unit provided at said bypass to recover said exhaust heat, and a switching valve switched to pass said exhaust gas through said bypass, the abnormality detection device comprising:
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recovery detection means for detecting exhaust heat recovery done by said exhaust heat recovery unit; and determination means for determining from said exhaust heat recovery whether said switching valve has abnormality. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An abnormality detection device detecting whether an exhaust heat recovery system recovering exhaust heat from exhaust gas exhausted from an engine has abnormality, said exhaust heat recovery system including a bypass connected parallel to an exhaust path passing said exhaust gas, an exhaust heat recovery unit provided at said bypass to recover said exhaust heat, and a switching valve switched to pass said exhaust gas through said bypass, the abnormality detection device comprising:
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a gas temperature detector disposed at least one of said bypass and said exhaust path to detect said exhaust gas'"'"'s temperature; and a determinator determining from said temperature whether said switching valve has abnormality; and a rotation rate detector detecting said engine'"'"'s rate of rotation, wherein said determinator determines whether said switching valve has abnormality from whether said temperature and said rate of rotation have a relationship corresponding to a predetermined relationship.
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19. An abnormality detection device detecting whether an exhaust heat recovery system recovering exhaust heat from exhaust gas exhausted from an engine has abnormality, said exhaust heat recovery system including a bypass connected parallel to an exhaust path passing said exhaust gas, an exhaust heat recovery unit provided at said bypass to recover said exhaust heat, and a switching valve switched to pass said exhaust gas through said bypass, the abnormality detection device comprising:
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a gas temperature detector disposed at least one of said bypass and said exhaust path to detect said exhaust gas'"'"'s temperature; and a determinator determining from said temperature whether said switching valve has abnormality, wherein said determinator determines whether said switching valve has abnormality from said temperature'"'"'s variation with time.
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20. (canceled)
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21. An abnormality detection device of an exhaust heat recovery system detecting whether an exhaust heat recovery system recovering exhaust heat from exhaust gas exhausted from an engine has abnormality, said exhaust heat recovery system including a bypass connected parallel to an exhaust path passing said exhaust gas, an exhaust heat recovery unit provided at said bypass to recover said exhaust heat, and a switching valve switched to pass said exhaust gas through said bypass, the abnormality detection device comprising:
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a recovery detector detecting exhaust heat recovery done by said exhaust heat recovery unit; and a determinator determining from said exhaust heat recovery whether said switching valve has abnormality. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification