Control arrangement for at least two hydraulic loads fed by at least one pump

US4759183A · kind A · utility

Assignee

• Mannesmann Rexroth AG · DE

Inventors

• Norbert Kreth · Minden, DE
• Heinz Torkler · Lohr am Main, DE
• Eugen Hufnagel · Pflochsbach, DE

Key dates

• Filing date: Dec 19, 1986
• Grant date: Jul 26, 1988
• Expiry date: Dec 19, 2006

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E02F9/2296
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A pump supplies via in each case a directional valve with associated pressure balance fluid or pressure medium to a plurality of loads. When the pump power is not sufficient a proportional quantity reduction is achieved at all loads in that the control voltages of the control members for electrical actuation of the directional valves are supplied to a summation stage and the sum voltage is compared in a comparison stage with a limit value corresponding to the maximum pump displacement, whereupon when the limit value is exceeded a control signal is generated with which the stroke of the driven directional valves is reduced.