Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1990-09-13
1992-01-21
Bennet, Henry A.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
237 123A, 16510411, G05D 2300
Patent
active
050821741
ABSTRACT:
In a heating apparatus for an automotive vehicle including an evaporator disposed within an engine exhaust pipe; a condenser disposed within a heat core; and a looped heat pipe for feeding medium vapor (e.g. steam) from the evaporator to the condenser and medium liquid (e.g. water) from the condenser to the evaporator, the heating system comprises, in particular, a vapor pressure sensor; a vapor temperature sensor; a controller for detecting abnormal heat cycle condition on the basis of detected vapor pressure and temperature sensors; at least one exhaust gas bypass flapper; and a flapper actuator for actuating the flapper at such a position that exhaust gas is bypassed away from the evaporator in response to a presence of the stop signal from the controller. In case cracks are formed on both the evaporator and condenser sides, since there exists such a danger that exhaust gas is introduced into the vehicle room, when heat cycle condition is detected as being abnormal on the basis of detected vapor pressure and temperature, the flapper is so actuated that the evaporator will not be heated by exhaust gas to disable the heating system. Further, it is preferable to immediately discharge exhaust gas introduced into the heat pipe to the engine intake manifold in response to the stop signal.
REFERENCES:
patent: 4667876 (1987-05-01), Negishi
patent: 4775102 (1988-10-01), Negishi
Bennet Henry A.
Nissan Motor Co,. Ltd.
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