A control system for a work implement on a machine is disclosed including a first hydraulic circuit, a second hydraulic circuit, and a controller. The first hydraulic circuit includes a hydraulic cylinder assembly, a pressurized fluid source, and a fluid tank. The hydraulic cylinder assembly include
A control system for a work implement on a machine is disclosed including a first hydraulic circuit, a second hydraulic circuit, and a controller. The first hydraulic circuit includes a hydraulic cylinder assembly, a pressurized fluid source, and a fluid tank. The hydraulic cylinder assembly includes a head end, a rod end, a cylinder, and a rod. The pressurized fluid source and the fluid tank are selectively connected to the head end or the rod end. The second hydraulic circuit includes a valve configured to receive a connection to tank signal and selectively connect the head end or the rod end to the fluid tank. The controller is configured to generate the connection to tank signal.
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1. A control system for a work implement on a machine, comprising: a first hydraulic circuit including a hydraulic cylinder assembly, the hydraulic cylinder assembly including a head end, a rod end, a cylinder, a rod, and a first valve that selectively connects either the head end or the rod end to
1. A control system for a work implement on a machine, comprising: a first hydraulic circuit including a hydraulic cylinder assembly, the hydraulic cylinder assembly including a head end, a rod end, a cylinder, a rod, and a first valve that selectively connects either the head end or the rod end to a pressurized fluid source, and the other of the head end or the rod end to a fluid tank through a first path;a second hydraulic circuit including a second valve that selectively connects either the head end or the rod end to the fluid tank through a second path, the second valve being configured such that if the head end has a lower pressure relative to the rod end, the second valve connects the head end to the fluid tank and if the rod end has a lower pressure relative to the head end, the second valve connects the rod end to the fluid tank; anda controller configured to generate a connection to tank control signal as a function of one or more parameters indicative of a resistive load being applied to the work implement. 2. The control system of claim 1 further including: a head end pressure sensor configured to generate a head end pressure signal indicative of a fluid pressure on the head end, and a rod end pressure sensor configured to generate a rod end pressure signal indicative of a fluid pressure on the rod end, and wherein the controller is configured to generate the connection to tank control signal as a function of the head end pressure signal and the rod end pressure signal. 3. The control system of claim 2, wherein; the second hydraulic circuit includes a third valve that is a spring biased, normally closed, and electrically actuated that includes;an input port fluidly connected to the head end, and an output port fluidly connected to the fluid tank, and wherein the third valve is operatively connected to the controller to open in response to the connection to tank control signal when the rod end pressure is greater than the head end pressure. 4. The control system of claim 2, wherein; the second hydraulic circuit includes a third valve that is a spring biased, normally closed, and electrically actuated that includes;an input port fluidly connected to the rod end, and an output port fluidly connected to the fluid tank, and wherein the third valve is operatively connected to the controller to open in response to the connection to tank control signal when the rod end pressure is greater than the head end pressure. 5. The control system of claim 1 further including: an operator interface configured to generate a signal indicating an operator work implement command, and wherein the controller is configured to generate the connection to tank control signal as a function of operator work implement command. 6. The control system of claim 1, wherein; the second hydraulic circuit includes a third valve which is a spring biased, normally closed, and electrically actuated directional control valve including;an input port selectively fluidly connected to one of the head end or the rod end, and an output port fluidly connected to the fluid tank, andwherein the third valve is operatively connected to the controller to open in response to the connection to tank control signal. 7. The control system of claim 1, wherein the second valve is an inverse shuttle valve including; a rod end input port fluidly connected to the rod end, a head end input port fluidly connected to the head end, and an output port selectively fluidly connected to the fluid tank. 8. The control system of claim 7, wherein; the second hydraulic circuit includes a spring biased, normally closed, and electrically actuated third valve including;an input port fluidly connected to the inverse shuttle valve output port, and an output port fluidly connected to the fluid tank, and the first directional control valve is operatively connected to the controller to open in response to the connection to tank control signal. 9. The control system of claim 1, wherein the first valve is a metering control valve having; a closed position wherein the head end is not fluidly connected with the fluid source or the fluid tank, and the rod end is not fluidly connected with the fluid source or the fluid tank, a rod extension position wherein the head end is fluidly connected with the fluid source, and the rod end is fluidly connected with the fluid tank, and a rod retraction position wherein the head end is fluidly connected with the fluid tank, and the rod end is fluidly connected with the fluid source. 10. The control system of claim 9, wherein; the second hydraulic circuit includes a third valve that is a spring biased, normally closed, and electrically actuated directional control valve including;an input port fluidly connected to the head end, and an output port fluidly connected to the fluid tank, and wherein the third valve is operatively connected to the controller to open in response to the connection to tank control signal when the metering control valve is in the rod retraction position. 11. The control system of claim 9, wherein; the second hydraulic circuit includes a third valve that is a spring biased, normally closed, and electrically actuated that includes;an input port fluidly connected to the rod end, and an output port fluidly connected to the fluid tank, and wherein the third valve is operatively connected to the controller to open in response to the connection to tank control signal when the metering control valve is in the rod extension position. 12. The control system of claim 1, wherein; the second hydraulic circuit includes a third valve that is a spring biased, normally closed, and electrically actuated directional control valve including;an input port fluidly connected to the head end, and an output port fluidly connected to the fluid tank, and wherein the work implement is a bucket, the controller is configured to detect a dump function, and the third valve is operatively connected to the controller to open in response to the connection to tank control signal when the a dump function is detected. 13. The control system of claim 1, wherein; the second hydraulic circuit includes a third valve that is a spring biased, normally closed, and electrically actuated that includes;an input port fluidly connected to the rod end, and an output port fluidly connected to the fluid tank, and wherein the work implement is a bucket, the controller is configured to detect a dig function, and the third valve is operatively connected to the controller to open in response to the connection to tank control signal when the a dig function is detected. 14. A method of controlling a work implement operatively connected to a hydraulic cylinder assembly with a head end, and a rod end, on a machine, comprising: directing fluid from a pressurized fluid source to one of the head end or the rod end and from the other of the head end or the rod end to a tank through a first path using a first valve of a first hydraulic circuit;detecting fluid pressure on the rod end;detecting fluid pressure on the head end; andif the fluid pressure of the rod end is less than the fluid pressure of the head end, selectively directing fluid from the rod end to a tank through a second path using a second valve of a second hydraulic circuit and, if the fluid pressure of the head end is less than the fluid pressure of the rod end, selectively directing fluid from the head end to the tank through the second path using the second valve of the second hydraulic circuit. 15. The method of claim 14, wherein the work implement is a bucket, the function is a dig function, and a connection to tank control signal is generated as a function of the fluid pressure on the head end being greater than the fluid pressure on the rod end by a predetermined value. 16. The method of claim 14, wherein the work implement is a bucket, the function is a dump function, and a connection to tank control signal is generated as a function of the fluid pressure on the rod end being greater than the fluid pressure on the head end by a predetermined value. 17. The method of claim 14, wherein the work implement function is commanded through an operator interface. 18. The method of claim 14, wherein the work implement function is commanded through an automated control. 19. The method of claim 14, further comprising, opening a directional control valve by generating a connection to tank signal. 20. A machine comprising: a power source;a work implement control system including;a first hydraulic circuit including a hydraulic cylinder assembly, the hydraulic cylinder assembly including a head end, a rod end, a cylinder, a rod, and a first valve that selectively connects one of the head end or the rod end to a pressurized fluid source, and the other of the head end or the rod end to a fluid tank through a first path;a second hydraulic circuit including a second valve that selectively connects one of the head end or the rod end to the fluid tank through a second path, the second valve being configured such that if the head end has a lower pressure relative to the rod end, the second valve connects the head end to the fluid tank and if the rod end has a lower pressure relative to the head end, the second valve connects the rod end to the fluid tank; anda controller configured to generate a connection to tank control signal as a function of one or more parameters indicative of a resistive load being applied to the work implement.
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