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Regenerative Circuits
for Mobile
and Industrial Applications
Mark Anderson
20 Nov 2013
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Definition
Connecting the rod end to the base end of a single rod cylinder
during the extend cycle.
Fluid that exits the rod end is added (regend) to the base
end.
All regen circuits increase speed, and reduce force.
Toyota Prius Hydraulic Launch Assist
Regeneration
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Definition
Standard Regen
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Definition
Simplified #1 Regen Simplified #2
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Definition
Double Rod Regen
2:1 ratio
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Definition
Pros
Cons
Good for Press circuits: when a large portion of the cycle is
pushing air
Quicker cycle times with a smaller motor/pump/reservoir
Equal force and speed when used with a 2:1 cylinder
Cheaper, smaller, and fewer seals than a double rod cylinder
More complex plumbing and valving
More logic required when shifting from high speed to high
force
Difficult to build exactly a 2:1 cylinder
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Definition
2:1 ratio High Ratio
(Large Rod)
Low Ratio
(Small Rod)
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Examples
Power Steering
2:1 cylinder
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Examples
Full Time Regen
Internal External
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Examples
Solenoid Switched Regen
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Examples
Pressure Activated Regen
Externally piloted sequence valve
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Examples
Pressure Sensitive Regen
Sun circuit with counterbalance valve
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Examples
Regen logic near cylinder
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Examples
Regen with rotary flow divider
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Examples
Regen with logic elements
Control Logic
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Examples
Proportional Regen with internal switching
Parker Hannifin D91FB Z
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Examples
Proportional Regen (5 position spool) with External plumbing
Eaton Vickers 133C spool
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Examples
Proportional Regen (4 position spool) (internal)
Bosch Rexroth
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Examples
Proportional Regen symbols
Traditional Preferred
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Examples
Definition of Efficiency
More
Energy Level
Less
Meter In Control
Load
Meter Out Control
Efficiency = Work Out / Energy In
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Examples
Servo valve vs. Proportional valve
High Delta P = High System Stiffness
You pay for Good Control (stiffness) with less efficiency
Servo rated 70bar (1000psi) Proportional rated 10bar
(150psi)
Max
Min0% 33% 67% 100%
Powerto Load
System Delta P% across valve
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Examples
Accuracy vs. Precision
Precise.
Not Accurate
Precise and Accurate Accurate.
Not Precise
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Examples
Proportional Regen two valve solution
Q=100
Ext=150
Ret=200
Ext= 50
Ret=100
2:1 ratio
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Examples
Proportional Regen internals
Centered
P to B
P to A
Continental Hydraulics VED07M
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Examples
Proportional Regen internals
P to A B to P
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Examples
Proportional Regen two valve solution
Q=100
Ext=150
Ret=200
Ext= 50
Ret=100
2:1 ratio
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