1. Dept. of Agricultural & Biological Engineering University of Illinois
ABE 223: ABE Principles – Machine Systems Regenerative Circuits Tony Grift
Dept. of Agricultural & Biological Engineering University of Illinois

2. Differential area cylinder: Flow and displacement
Force Equilibrium
Velocity of piston
Dept. of Agricultural Engineering
University of Illinois

3. Conventional advance in circuit
Dept. of Agricultural Engineering
University of Illinois

4. Force equilibrium during Regenerative advance
Dept. of Agricultural Engineering
University of Illinois

5. Velocity during Regenerative advance
KCL in node N
Velocity of piston (differential area cylinder)
Dept. of Agricultural Engineering
University of Illinois

6. Velocity during Regenerative advance
Dept. of Agricultural Engineering
University of Illinois

7. Velocity during Regenerative advance
Dept. of Agricultural Engineering
University of Illinois

8. Summary Conventional Regenerative Force: Velocity:
Conventional
Regenerative
Force:
Velocity:
Dept. of Agricultural Engineering
University of Illinois

9. Summary cont.
In other words, during regenerative advance, the cylinder behaves as if its cap end area is equal to the rod area which is equal to
Cap end Area
Rod end Area
(Annular)
Rod Area
Dept. of Agricultural Engineering
University of Illinois

10. Regenerative advance in circuit
Dept. of Agricultural Engineering
University of Illinois

11. Regenerative advance in circuit with switchover
(pressurize cap
and rod end)
Conventional
(rod end to tank)
Dept. of Agricultural Engineering
University of Illinois

12. Conventional advance (v = 0.17 ms^-1)
Dept. of Agricultural Engineering
University of Illinois

13. Regenerative advance (v=0.43 ms^-1)
Dept. of Agricultural Engineering
University of Illinois

14. Why Regenerative Circuits
Benefit of fast advance
Example Press a workpiece
Advance (extend) cylinder rapidly (regeneratively) with reduced force, using rod area (not annular)
Detect increased pressure when press makes contact
Switch automatically to conventional advance
Press the work piece with full force (using cap end area)
There is only regenerative advance (extension), no retraction
Dept. of Agricultural Engineering
University of Illinois

15. Dept. of Agricultural Engineering University of Illinois

16. Dept. of Agricultural & Biological Engineering University of Illinois
ABE 223 Agricultural & Biological Engineering I OREE section Regenerative Circuits The End
Dept. of Agricultural & Biological Engineering University of Illinois