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Patent Searching and Data


Title:
CONTROL DEVICE, CONTROL METHOD, SHAPING DEVICE, AND SHAPING METHOD FOR FIXED DISPLACEMENT PUMP
Document Type and Number:
Japanese Patent JPH08303353
Kind Code:
A
Abstract:

PURPOSE: To reduce delivery pressure changes of a fixed displacement pump despite of a simple and inexpensive structure, by amplifying output signals of a filter circuit which passes only frequency signal components of the delivery pressure changes originated from the fixed displacement pump, converting the amplified output signals into binary values, and selecting a voltage value according to the binary signals.

CONSTITUTION: A pressure gage 3 is provided downstream from the delivery opening of a fixed displacement pump 2 which is driven by a motor 1 and only frequency signal components of delivery pressure changes originated from the fixed displacement pump 2 out of its output signals are made to pass through a filter circuit 4. The signals passed through the filter circuit are amplified 5 and then compared with a prescribed reference voltage in a comparison circuit 6 so as to be converted into binary values and voltage values (b), (c) (b>c), which are set in an additional value set circuit 8, are selected and output according to the binary signals by a selector 9. Next, the output voltage of the selector 9 and the output voltage (a) of a rotation speed set circuit 7 are added 10, and the output after addition is output 11 to a motor 1 by converted into a voltage value or a current value drivable of the motor.


Inventors:
FUKUDA ZENPEI
AMAKAWA TAKEAKI
OKAMOTO MASAJI
NAKAMURA KAZUMI
MURO MAKOTO
Application Number:
JP5188296A
Publication Date:
November 19, 1996
Filing Date:
March 08, 1996
Export Citation:
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Assignee:
MITSUBISHI RAYON CO
International Classes:
F04C14/00; F04B11/00; F04B13/00; F04B49/06; F04C14/08; (IPC1-7): F04B49/06; F04B11/00; F04B13/00