Pump torque control system

Details Pump torque control system Pump torque control system

1996-12-20

1999-08-10

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

With control of pump drive transmission

4172221, F04B 4900

Patent

active

059348798

ABSTRACT:
An engine torque, which corresponds to a target engine speed inputted in a controller, is determined by a functional computing function unit. A torque correction value is added to the engine torque, followed by the multiplication with a constant. The product is divided by a pump delivery pressure to determine a pump displacement. A target tilting corresponding to this value is determined by another functional computing function unit, and is then compared with another target tilting which has been determined from a negative control pressure. The smaller one is selected and is outputted as a target tilting. The torque correction value is set at an EEPROM through an input device as desired. Selection of a negative value as the torque correction value makes it possible to prevent occurrence of stalling.

REFERENCES:
patent: 4637781 (1987-01-01), Akiyama et al.
patent: 5307631 (1994-05-01), Tatsumi et al.
patent: 5540554 (1996-07-01), Masuzawa
patent: 5628188 (1997-05-01), Kordak
patent: 5630317 (1997-05-01), Takamura

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