Hydrostatic drive system

1. A hydrostatic drive system, comprising:

a pump;

at least one consumer controlled by a control valve that can be actuated by control signals; and

a precharge device that generates a precharge pressure and is located in a reservoir line that leads from the control valve to the reservoir, which precharge device can be pressurized as a function of the control signals of the control valve,

wherein the precharge device can be pressurized in a direction of an elevation of the precharge pressure when there is a decreasing control signal of the control valve.

2. The hydrostatic drive system as claimed in claim 1 , wherein the precharge device has a control surface that acts in the direction of an elevation of the precharge pressure and is functionally connected to a control pressure line, and wherein an on-off valve that can be actuated by the control signal of the control valve is located in the control pressure line.

3. The hydrostatic drive system as claimed in claim 2 , wherein the on-off valve has a flow position and a shutoff position, wherein the on-off valve can be pushed toward the flow position by a spring and toward the shutoff position by the control signal of the control valve.

4. The hydrostatic drive system as claimed in claim 3 , wherein the consumer comprises a double-acting consumer, and a shuttle valve device is provided for selection of the control signal of the control valve.

5. The hydrostatic drive system as claimed in claim 3 , wherein the control pressure line is a brake line that carries a braking air pressure to a braking device.

6. The hydrostatic drive system as claimed in claim 3 , wherein the consumer comprises a slewing gear motor of a slewing gear of a mobile piece of equipment.

7. The hydrostatic drive system as claimed in claim 2 , wherein the control pressure line is a brake line that carries a braking air pressure to a braking device.

8. The hydrostatic drive system as claimed in claim 7 , wherein the consumer comprises a slewing gear motor of a slewing gear of a mobile piece of equipment.

9. The hydrostatic drive system as claimed in claim 2 , wherein the consumer comprises a double-acting consumer, and a shuttle valve device is provided for selection of the control signal of the control valve.

10. The hydrostatic drive system as claimed in claim 2 , wherein the consumer comprises a slewing gear motor of a slewing gear of a mobile piece of equipment.

11. The hydrostatic drive system as claimed in claim 1 , wherein the consumer comprises a double-acting consumer, and a shuffle valve device is provided for selection of the control signal of the control valve.

12. The hydrostatic drive system as claimed in claim 11 , wherein the consumer comprises a slewing gear motor of a slewing gear of a mobile piece of equipment.

13. The hydrostatic drive system as claimed in claim 1 , wherein the consumer comprises a slewing gear motor of a slewing gear of a mobile piece of equipment.

14. The hydrostatic drive system as claimed in claim 13 , wherein the equipment is an excavator.

15. A hydrostatic drive system, comprising:

a pump;

at least one consumer controlled by a control valve that can be actuated by control signals;

a precharge device that generates a precharge pressure and is located in a reservoir line that leads from the control valve to a reservoir, the precharge device being pressurized as a function of the control signals of the control valve; and

an on-off valve located in a control pressure line and actuated between a flow position and a shutoff position by the control signals of the control valve,

wherein the precharge device has a control surface that acts in the direction of an elevation of a precharge pressure, the control surface being functionally connected to the control pressure line, and wherein the on-off valve is in the flow position during a decreased control signal of the control valve.