Internal-combustion engines – Cooling – Devices for cooling liquid by air flow
Reexamination Certificate
2006-07-06
2010-12-28
Kamen, Noah (Department: 3741)
Internal-combustion engines
Cooling
Devices for cooling liquid by air flow
C123S041110, C123S041120, C060S493000
Reexamination Certificate
active
07856951
ABSTRACT:
An invention relating to a control apparatus and a control method for a hydraulically driven cooling fan for reducing the peak pressure produced upon reversing the switch position of a switching valve, without stopping an engine, and without greatly modifying existing hydraulic circuitry or increasing the apparatus cost. In the invention, in the case that a reversing switch has been operated so as to output a reversal processing commencement instruction signal, control is carried out such that, under the condition that the rotational speed of the engine has decreased to not more than a stipulated rotational speed, capacity adjusting means is controlled, so as to reduce the capacity of a hydraulic pump, and thus reduce the fan rotational speed, and then the switch position of the switching valve is reversed.
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Japanese Office Action for related patent No. 2005-197936.
Kamado Mitsuhiko
Nakagawa Tomohiro
Yamamoto Shigeru
Husch Blackwell Welsh & Katz
Kamen Noah
Komatsu Ltd.
Nguyen Hung Q
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