Arrangement for charging an accumulator
First Claim
1. An arrangement for charging an accumulator with hydraulic fluid, wherein the accumulator is used in a hydraulic boom suspension system for a lift arm of a vehicle, the arrangement comprisinga first hydraulic pump arranged to supply hydraulic fluid to a hydraulic cylinder system of the lift arm,a second hydraulic pump arranged to supply hydraulic fluid to a second hydraulic system, wherein the second hydraulic pump is further arranged to supply hydraulic fluid for charging the accumulator,a first charging function adapted to charge the accumulator to a first pressure using the second pump by ramping up the pressure in the second pump according to a predefined pressure ramp function to a first pressure when the boom suspension system is inactivated, anda second charging function adapted to charge the accumulator to a second pressure using the second pump by further ramping up the pressure in the second pump according to a second predefined pressure ramp function to a level which is greater than the first pressure and substantially equal to a current load pressure in the lift arm hydraulic cylinder system when a control signal indicates that the boom suspension system is to be activated.
1 Assignment
0 Petitions
Accused Products
Abstract
An arrangement for charging an accumulator with hydraulic fluid is provided. The accumulator is used in a hydraulic boom suspension system for a lift arm of a vehicle and the arrangement includes a first hydraulic pump arranged to supply hydraulic fluid to a hydraulic cylinder system of the lift arm, and a second hydraulic pump arranged to supply hydraulic fluid to a second hydraulic system. The second hydraulic pump is further arranged to supply hydraulic fluid for charging the accumulator.
13 Citations
19 Claims
-
1. An arrangement for charging an accumulator with hydraulic fluid, wherein the accumulator is used in a hydraulic boom suspension system for a lift arm of a vehicle, the arrangement comprising
a first hydraulic pump arranged to supply hydraulic fluid to a hydraulic cylinder system of the lift arm, a second hydraulic pump arranged to supply hydraulic fluid to a second hydraulic system, wherein the second hydraulic pump is further arranged to supply hydraulic fluid for charging the accumulator, a first charging function adapted to charge the accumulator to a first pressure using the second pump by ramping up the pressure in the second pump according to a predefined pressure ramp function to a first pressure when the boom suspension system is inactivated, and a second charging function adapted to charge the accumulator to a second pressure using the second pump by further ramping up the pressure in the second pump according to a second predefined pressure ramp function to a level which is greater than the first pressure and substantially equal to a current load pressure in the lift arm hydraulic cylinder system when a control signal indicates that the boom suspension system is to be activated.
-
11. A method for charging an accumulator with hydraulic fluid, wherein the accumulator is used in a hydraulic boom suspension system for a lift arm of a vehicle, the lift arm being provided with a hydraulic cylinder system including a first hydraulic pump arranged to supply hydraulic fluid to the hydraulic cylinder system and a second hydraulic pump arranged to supply hydraulic fluid to a second hydraulic system, wherein the second hydraulic pump is further arranged to supply hydraulic fluid for charging the accumulator, comprising:
-
charging the accumulator to a first pressure using the second pump by ramping up the pressure in the second pump according to a predefined pressure ramp function to a first pressure when the boom suspension system is inactivated, and charging the accumulator to a second pressure using the second pump by further ramping up the pressure in the second pump according to a second predefined pressure ramp function to a level which is greater than the first pressure and substantially equal to a current load pressure in the lift arm hydraulic cylinder system when a control signal indicates that the boom suspension system is to be activated. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
Specification