Internal-combustion engines – Cooling – Parallel flow
Reexamination Certificate
1999-06-07
2001-11-27
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Cooling
Parallel flow
C123S563000, C123S568120
Reexamination Certificate
active
06321697
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cooling apparatus for a vehicular engine, and in particular to cooling technology for an automobile engine which incorporates at least one of an exhaust gas recirculation unit and an intercooler.
2. Description of the Related Art
With an automobile engine, there are those where an EGR (Exhaust Gas Recirculation) unit is provided for reintroducing a part of the exhaust gas back into the engine to thereby reduce the NOx in the exhaust gas, and those where an intercooler is provided between the turbo charger and the intake manifold for cooling the intake and exhaust gas. Since the EGR and intercooler are each exposed to high temperature exhaust gas, a liquid cooling system is employed where a coolant is circulated by the engine pump, and the heat from the intercooler and the EGR is carried to the radiator, to thereby to cool the intercooler and the EGR.
With the above, since the engine pump is used in the cooling of the EGR and the intercooler, when the engine stops, then the engine pump also inevitably stops. In this case, the temperature of the EGR and the intercooler increases, and hence immediately after stopping, the coolant therein boils and the metal parts are exposed to high temperature, with the result that there is a reduction in life.
SUMMARY OF THE INVENTION
It is an object of the present invention to address the problems with the conventional technology, and provide a cooling apparatus for a vehicular engine which can improve the life of at least one of the exhaust gas recirculation unit and the intercooler.
The cooling apparatus for a vehicular engine of the present invention for achieving the above object incorporates; a vehicular engine provided with at least one of an exhaust gas recirculation unit and a turbo charger intercooler, a radiator, and an electric pump for circulating coolant to carry heat generated by at least one of the intercooler and the exhaust gas recirculation unit to the radiator.
With the present invention, when the vehicular engine is stopped, the operation of the electric pump after stopping continues on for a fixed period so that coolant cooled by the radiator is introduced to at least one of the EGR and the intercooler to provide cooling to thus rapidly reduce the temperature. Then when a low temperature is reached the electric pump is stopped.
According to a second aspect of the present invention, the radiator, the electric pump, the intercooler and the exhaust gas recirculation unit are arranged in order in the coolant circulation circuit, and the coolant is supplied by the electric pump sequentially to the intercooler and the exhaust gas recirculation unit to thereby cool both the intercooler and the exhaust gas recirculation unit.
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Bian June
Major Gregory A.
Matsuda Kenji
Mizutani Hiroshi
Huynh Hai
Mitsubishi Heavy Industries Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Wolfe Willis R.
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