Controller for a variable displacement feed pump
First Claim
1. A variable delivery feed pump for hydraulic media, comprising an input and an output, at the output a feed pressure (P1) being present, a pressure-reducing element that is connected to the output, at an output of the pressure-reducing element the system pressure (P2) being present and the output of the pressure-reducing element being connected to a consumer, wherein the output of the variable delivery pump is connected to a first input of a pump controller, and a second input of the pump controller is connected to the output of the pressure-reducing element, and wherein the pump controller adjusts the feed pump toward maximum delivery if the system pressure (P2) is smaller than a minimum pressure or if the system pressure (P2) is smaller than the pressure present at the first input, and wherein parallel to the pump controller a pressure limiter is switched such that at a first input thereof the pressure present at the first input of the pump controller is present and that at a control input the system pressure (P2) is present, the pressure limiter opening if the system pressure (P2) is greater than a desired value.
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Accused Products
Abstract
The disclosure relates to a feed pump for hydraulic media having an input and an output. A pressure-reducing element is connected to the output, at the output of the element the system pressure being present and the output being connected to a consumer, wherein the output is connected to the first input of a pump controller, the second input being connected to the output of the pressure-reducing element, and wherein the pump controller adjusts the feed pump toward maximum delivery if the system pressure is smaller than a minimum pressure or if the system pressure is smaller than the feed pressure, and wherein parallel to the pump controller a pressure limiter is switched such that at the first input thereof the feed pressure is present and at the control input the system pressure is present, wherein the pressure limiter opens if the feed pressure is greater than a desired value.
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Citations
17 Claims
- 1. A variable delivery feed pump for hydraulic media, comprising an input and an output, at the output a feed pressure (P1) being present, a pressure-reducing element that is connected to the output, at an output of the pressure-reducing element the system pressure (P2) being present and the output of the pressure-reducing element being connected to a consumer, wherein the output of the variable delivery pump is connected to a first input of a pump controller, and a second input of the pump controller is connected to the output of the pressure-reducing element, and wherein the pump controller adjusts the feed pump toward maximum delivery if the system pressure (P2) is smaller than a minimum pressure or if the system pressure (P2) is smaller than the pressure present at the first input, and wherein parallel to the pump controller a pressure limiter is switched such that at a first input thereof the pressure present at the first input of the pump controller is present and that at a control input the system pressure (P2) is present, the pressure limiter opening if the system pressure (P2) is greater than a desired value.
Specification