Drive system, in particular for a self-propelled construction machine, in particular a soil compactor
First Claim
1. A self-propelled construction machine having a drive system, said drive system comprising:
- a drive unit;
at least one hydraulic circuit with a hydraulic pump driven by the drive unit,a hydraulic drive support unit with a hydraulic pump/motor assembly and at least one pressure fluid reservoir, wherein the hydraulic pump/motor assembly is, or can be, drivingly coupled with the drive unit or/and at least one of the at least one hydraulic circuit, wherein the hydraulic pump/motor assembly can be driven in a charge operating mode by the drive unit and at least one of the at least one hydraulic circuit as a pump to charge at least one of the at least one pressure fluid reservoir to a maximum charge and can be operated in a drive support operating mode as a motor to provide a drive support torque for the hydraulic pump of at least one of the at least one hydraulic circuit;
at least one fluid reservoir;
wherein the hydraulic pump/motor assembly can be operated in a recirculation operating mode as a pump to convey fluid out of a fluid reservoir of the at least one fluid reservoir and into the same, or another fluid reservoir of the at least one fluid reservoir;
wherein the hydraulic pump/motor assembly is operated to provide the recirculation operating mode when the charging mode of at least one of the at least one pressure fluid reservoir is above a threshold charge below said maximum charge and a drive speed of the drive unit is below a threshold speed.
1 Assignment
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Accused Products
Abstract
A drive system, in particular for a self-propelled construction machine, in particular a soil compactor, comprises a drive unit, at least one hydraulic circuit with a hydraulic pump driven by the drive unit, a hydraulic drive support unit with a hydraulic pump/motor assembly, and at least one pressure fluid reservoir, wherein the hydraulic pump/motor assembly is, or can be, drivingly coupled with the drive unit and/or at least one hydraulic circuit, wherein the hydraulic pump/motor assembly can be operated in a charging operating mode by the drive unit and/or at least one hydraulic circuit as a pump to charge at least one pressure fluid reservoir, and be driven in a drive support operating mode as a motor to provide a drive support torque for the hydraulic pump of at least one hydraulic circuit, characterized in that the hydraulic pump/motor assembly is operated in a recirculation operating mode as a pump to convey fluid out of a fluid reservoir and into a fluid reservoir.
13 Citations
17 Claims
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1. A self-propelled construction machine having a drive system, said drive system comprising:
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a drive unit; at least one hydraulic circuit with a hydraulic pump driven by the drive unit, a hydraulic drive support unit with a hydraulic pump/motor assembly and at least one pressure fluid reservoir, wherein the hydraulic pump/motor assembly is, or can be, drivingly coupled with the drive unit or/and at least one of the at least one hydraulic circuit, wherein the hydraulic pump/motor assembly can be driven in a charge operating mode by the drive unit and at least one of the at least one hydraulic circuit as a pump to charge at least one of the at least one pressure fluid reservoir to a maximum charge and can be operated in a drive support operating mode as a motor to provide a drive support torque for the hydraulic pump of at least one of the at least one hydraulic circuit; at least one fluid reservoir; wherein the hydraulic pump/motor assembly can be operated in a recirculation operating mode as a pump to convey fluid out of a fluid reservoir of the at least one fluid reservoir and into the same, or another fluid reservoir of the at least one fluid reservoir; wherein the hydraulic pump/motor assembly is operated to provide the recirculation operating mode when the charging mode of at least one of the at least one pressure fluid reservoir is above a threshold charge below said maximum charge and a drive speed of the drive unit is below a threshold speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a self-propelled construction machine having a drive system, the drive system comprising:
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a drive unit; at least one hydraulic circuit with a hydraulic pump driven by the drive unit; a hydraulic-drive support unit with a hydraulic pump/motor assembly and at least one pressure fluid reservoir; at least one fluid reservoir; wherein the hydraulic pump/motor assembly is, or can be, drivingly coupled with the drive unit or/and at least one hydraulic circuit; wherein the hydraulic pump/motor assembly can be operated in a charging operating mode by the drive unit and at least one of the at least one hydraulic circuit as a pump to charge at least one of the at least one pressure fluid reservoir to a maximum charge and be operated in a drive support operating mode as a motor to provide a drive support torque for the hydraulic pump of at least one of the at least one hydraulic circuit, in which procedure the hydraulic pump/motor assembly can be operated in a recirculation operating mode as a pump to convey fluid out of a fluid reservoir of the at least one fluid reservoir and into the same or another fluid reservoir of the at least one fluid reservoir; wherein the hydraulic pump/motor assembly is operated in the recirculation operating mode when a charge state of at least one pressure fluid reservoir of the at least one pressure fluid reservoir is above a predetermined threshold charge and below said maximum charge and a speed of the drive unit is below a predetermined threshold speed. - View Dependent Claims (17)
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Specification