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DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.1
Hydraulic Systems DigitalizationEnrique BusquetsEngineering Manager – Mobile Systems and Electronics
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Hydraulic Systems DigitalizationUnleashing Hydraulics Through Electronics
2
Hydraulic Systems
Digitalization
Hydraulics
Controls
Model-based
engineering
Robotics
Connectivity
& Services
Sensors & HMI
Computer Vision
Artificial
Intelligence
Rexroth
Bosch
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
T
ABa1 b1
P
T pST
Hydraulic
Joystick
4TH6
Hydraulic Pilot Control (Non-EH System) Electro-Hydraulic Pilot Control (EH System)
vs.
Hydraulic Systems DigitalizationUnleashing Hydraulics Through Electronics
3
Driver demand is given by hydraulic pilot pressure
No electronics, no software
Driver demand is given by electronic joystick
Software computes the actuation currents for DREs
T
AB
DRE a1 DRE b1P
CAN
Joystick
THE5
ECU
RC28-14/30CAN
Driver demand can be manipulated by softwareNo possibility to manipulate driver demand
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Traditional Load Sensing HydraulicsWorking Principle
4
Pump operates in a closed-loop control with reference on the highest load pressure
dp
1 2
consumer
psys
pLS
pre
ssure
consumer 1
consumer 2
pLS
psys
LS valve stack
A fixed setting of the pump’s control parameters must be a
compromise across all operating conditions
This load pressure generally exhibits large changes
Additional uncertainties exist in the system (i.e. changes in temperature, natural frequencies and damping).
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Traditional Load Sensing HydraulicsWorking Principle
5
In tractor applications, one setting has to cover:
dp
1 2
consumer
psys
pLS
pre
ssure
consumer 1
consumer 2
pLS
psys
LS valve stack
• Multiple different implements
• Varying working conditions & processes
• Individual driver preferences
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Load Sensing Hydraulics
6
consumer 1
consumer 2
pLS
psys
LS valve stackconsumer 1
consumer 2
pLS
psys
LS valve stack
β∩
Architecture Comparison
Electronic Load SensingHydraulic Load Sensing (traditional)
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
e-LS Advances Load-Sensing Systems
7
e-LS+++ Efficiency
++ Controllability
++ Oil-flow
+ Operating Modes
+ Machine management
+ Performance
+ Diagnostics
Closed CenterLoad Sensing
++ Efficiency
+ Controllability
+ Oil-flow
+++ Efficiency
++ Controllability
++ Oil-flow
Open CenterLoad Sensing
Open CenterMultiplepumps
+ Oil-flow
+ Energy
Open CenterOne pump
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Load Sensing Hydraulics
8
Hydraulic Load Sensing (traditional) Electronic Load Sensing
Pump Pressure Settings Comparison
Not usable
Fixed pressure cut-off
Fixed standby pressure
time
pre
ss
ure Limited pump
pressure range
Maximum allowable pump pressure
Not usable
Minimum needed pump pressure
Variable pressure cut-off
Variable standby pressure
time
pre
ss
ure
Extended pump
pressure range
Maximum allowable pump pressure
Minimum needed pump pressure
+ Maximum system pressure is defined by software
+ Possibility of pressure/force limitation for single machine
functions (e.g. gripper force limitation)
+ Lower standby pressure
- No possibility to vary pump settings on demand
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Load Sensing Hydraulics
9
Hydraulic Load Sensing (traditional) Electronic Load Sensing
Pump Dynamic Behavior Comparison
Not usable
time
pre
ss
ure Fixed pump
dynamic response
Maximum allowable pump pressure
Not usable
Minimum needed pump pressure
- No possibility to vary pump settings on demand
+ Avoid oscillations
+ Smooth reaction for high controllability
+ Fast reaction for aggressive maneuvers
time
pre
ss
ure
Variable
dynamic response
Maximum allowable pump pressure
Minimum needed pump pressure
fastmedium
slow
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Load Sensing Hydraulics
10
Hydraulic Load Sensing (traditional) Electronic Load Sensing
Pressure Behavior Comparison
Not usable
time
pre
ss
ure
Unfiltered pressure
Maximum allowable pump pressure
Not usable
Minimum needed pump pressure
- No possibility to vary pump settings on demand
+ Avoid oscillations
+ Smooth reaction for high controllability
+ Fast reaction for aggressive maneuvers
time
pre
ss
ure
Electronic filtering
Maximum allowable pump pressure
Minimum needed pump pressure
pump pressure
load pressure
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS)Various Operation Modes for Different Use Cases
11
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
oil flow
pre
ss
ure
load pressure
pump pressure
Variable Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
implement
Energy saving
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Pressure Control
pstb
pmax
control signal
pre
ss
ure
pump pressure
Active Pressure Control
pstb
pmax
e.g.
ctrl sig= alpha drive pedal
Mode 4
Mode 2
Mode 3
Mode 1
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS)Various Operation Modes for Different Use Cases
12
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
oil flow
pre
ss
ure
load pressure
pump pressure
Variable Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
implement
Energy saving
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Pressure Control
pstb
pmax
control signal
pre
ss
ure
pump pressure
Active Pressure Control
pstb
pmax
e.g.
ctrl sig= alpha drive pedal
Mode 4
Mode 2
Mode 3
Mode 1
Enhanced implement performance due to
optimal compensation of pressure losses
Higher stability
Energy saving
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS)Various Operation Modes for Different Use Cases
13
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
oil flow
pre
ss
ure
load pressure
pump pressure
Variable Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
implement
Energy saving
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Pressure Control
pstb
pmax
control signal
pre
ss
ure
pump pressure
Active Pressure Control
pstb
pmax
e.g.
ctrl sig= alpha drive pedal
Mode 4
Mode 2
Mode 3
Mode 1
Fast reaction and increased stability for
certain implements
Working point optimization with adjustable
constant pressure for secondary controlled
implements
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS)Various Operation Modes for Different Use Cases
14
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
oil flow
pre
ss
ure
load pressure
pump pressure
Variable Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
implement
Energy saving
oil flow
pre
ss
ure
load pressure
pump pressure
Constant Pressure Control
pstb
pmax
control signal
pre
ss
ure
pump pressure
Active Pressure Control
pstb
pmax
e.g.
ctrl sig= alpha drive pedal
Mode 4
Mode 2
Mode 3
Mode 1
Possibility of torque based driving
(additional driven axle on trailer, etc.)
Pressure on demand
(front axle activation)
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Load Sensing Hydraulics
15
Selecting the Optimized Settings for Each Individual Implement
Manual
Automatic
consumer 1
consumer 2
pLS
psys
LS valve stack
Electronic Load Sensing
β∩
Remote
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Load Sensing Hydraulics
16
eLS with Steering
STEERING
consumer 2
pLS
psys
LS valve stack
Electronic Load Sensing
β∩
***
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.17
Practical Examples
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS) Hydraulics
18
control signal
pre
ss
ure
pump pressure
Active Pressure Control
pstb
pmax
e.g.
ctrl sig= alpha drive pedal
Griper Control
Pressure Too Low Pressure Too HighOptimal and repeatable
pressure setting
Electronic Load Sensing
(eLS)
Hydraulic Load Sensing
(LS)
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS) Hydraulics
19
oil flow
pre
ss
ure
load pressure
pump pressure
Variable Differential Pressure
dp
variable
pstb
pmax
system(Pressure losses)
implement
Energy saving
Electronic Load Sensing (eLS)Hydraulic Load Sensing (LS)
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS) Hydraulics
20
time
pre
ss
ure
Variable
dynamic response
Maximum allowable pump pressure
Minimum needed pump pressure
fastmedium
slow
Front-loader Lifting Control
Electronic Load Sensing (eLS)
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS) Hydraulics
21
time
pre
ss
ure
Electronic filtering
Maximum allowable pump pressure
Minimum needed pump pressure
Fan Control
Electronic Load Sensing (eLS)Hydraulic Load Sensing (LS)
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
Electronic Load Sensing (eLS)
22
Enhanced Benefits for Most Efficient Working Results
Improved Efficiency due to optimized differential pressure
Increased power and improved response of the implement,
due to variable pressure limits
Individual system adaption
Easy to use with predefined modes
High flexibility, software-based variant handling
Less installation space
Connectivity option for system monitoring
Saves
energy
Ease
of use
Increased
power
Highly
flexible
More
precise
Saves
time
Adaptive
Less
space
DC-MH/ENG5-NA | 29/05/2019
© Bosch Rexroth AG 2019. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.23
Thank You!Enrique Busquets