Internal-combustion engines – With heating means
Reexamination Certificate
1999-07-28
2001-03-13
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
With heating means
Reexamination Certificate
active
06199528
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cooling device for internal combustion engines wherein cooling water is circulated through a radiator and the internal combustion engine. More particularly, the present invention relates to a cooling device of the type in which a shorter time period of engine warm-up mode can be established.
2. Prior Art
A need has existed to shorten the time period for an engine to warm up. U.S. Pat. No. 5,435,277 proposes a device to address this concern, wherein an amount of high temperature water is injected into an engine whenever the engine is started, thereby accelerating the warming-up operation of the engine. Thus, the time period for an engine warm-up mode can be shortened.
However, for establishing such an injection of high temperature water, a tank for storing the water has to be prepared. In addition, an additional water passage has to be connected to the existing water circulation line, and the resultant complexity thereof in structure makes it cumbersome to assemble.
SUMMARY OF THE INVENTION
In light of the foregoing, a cooling device for internal combustion engines is desired which is free from the foregoing drawbacks.
In order to attain the foregoing objects, a first embodiment of the present invention provides a cooling device for an internal combustion engine which includes:
an electrically operated motor having a housing, an output shaft, a magnet rotor fixedly mounted on the output shaft, and a stator positioned in the housing;
an impeller connected at an outside of the housing to one end of the output shaft of the motor and circulating a cooling liquid through the engine and a radiator while the output shaft is being rotated; and
means for generating a heat at the phase windings for warming-up the cooling liquid if a temperature thereof is below a set value.
A second embodiment of the present invention provides a cooling device for an internal combustion engine which includes:
an electrically operated motor having an output shaft and rotating the output shaft upon energization of the motor;
an impeller connected to one end of the output shaft for circulating a cooling liquid through the engine and a radiator while the output shaft of the motor is being rotated; and
means for stopping the rotation of the output shaft of the motor without interrupting the energization of the motor when a temperature of the cooling liquid is below a set value.
A third embodiment of the present invention provides a cooling device for an internal combustion engine comprising:
a brushless DC motor having an output shaft, a magnetic rotor fixedly mounted on the output shaft, and a stator having three phase windings which are circumferentially arranged around the output shaft;
an impeller connected to one end of the output shaft for circulating a cooling liquid through the engine and a radiator while the output shaft of the motor is being rotated; and
means for energizing the stator so that current supplied to each of the phase windings is supplied based on an angular position of the output shaft.
REFERENCES:
patent: 4516915 (1985-05-01), Jensen et al.
patent: 4728268 (1988-03-01), Laing
patent: 5079488 (1992-01-01), Harms et al.
patent: 5435277 (1995-07-01), Takahashi
patent: 5616973 (1997-04-01), Khazanov et al.
patent: 5785013 (1998-07-01), Sinn et al.
patent: 5909072 (1999-06-01), Muller
Hotta Takayuki
Ozawa Yasuo
Aisin Seiki Kabushiki Kaisha
Ali Hyder
Burns Doane , Swecker, Mathis LLP
Wolfe Willis R.
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