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1Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Quantity Correction Functions
2Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFLZFL
ZeroFuel Calibrn @ Low Idle
3Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFLZFL
ZeroFuel Calibrn @ Low Idle
4Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA)
Concept
Effect of IMA
Advantages
5Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA/IMA)
6Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA)
7Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA/IMA)
8Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA/IMA)
Operating Principle
The deviation of the individual injector quantity to the nominal qty at the test point is used
ECU adjustment values represent the difference to the specified values of the respective test point Encoded on Injector
EOL programming to the ECU
IQA helps
To have better control on emission values
Equal Injection quantity for each cylinder
Increase of the injector first pass yield (FPY)
9Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA/IMA)
10
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA/IMA)
Programming of the Control Unit (ECU)
11
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Injector Quantity Adjustment (IQA/IMA)
Processes for EOL-Programming
12
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFLZFL
ZeroFuel Calibrn @ Low Idle
13
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
FBC Fuel Balance Control
FBC Overview
Benefit for Emission
Application Boundary condition
14
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
FBC Fuel Balance ControlFeatures
Correction of Cylinder to cylinder quantity deviations over lifetime
Reconstruction of fuel quantity deviations using engine speed signal
Smooth running control fulfils this task at low engine speeds
Fuel quantity control fulfils this task at all the speed ranges, using
Precise engine speed evaluation
Filtering of crankshaft oscillations
Pulse generator wheel correction in overrun
Benefits
Smooth running of engine
Lower exhaust emissions
15
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
FBC Fuel Balance Control
16
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
FBC Overview FBC uses information from the speed sensor to calculate correction
quantities in order to :
- Maintain a smooth engine speed for higher comfort and
- Less deviations from mean fuel quantity value for better emission results
FBC equals injection quantities between cylinders
17
0000 5555 10101010 15151515 20202020 25252525 30303030 353535350000
0.50.50.50.5
1111
1.51.51.51.5
2222
2.52.52.52.5
3333
3.53.53.53.5
4444
4.54.54.54.5
5555
Frequency [Hz]Frequency [Hz]Frequency [Hz]Frequency [Hz]
Epm _nEng_w/o FBCEpm _nEng_w/o FBCEpm _nEng_w/o FBCEpm _nEng_w/o FBC
Epm _nEng_wi th FBCEpm _nEng_wi th FBCEpm _nEng_wi th FBCEpm _nEng_wi th FBC
Quantity Correction Functions
Confidential | ENA32 | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
FBC Evaluation
FBC benefit
FFT Analysis Engine Speed
FFT Analysis shows benefit of FBC at CaS, 2CaS and 3CaS
18
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
Evaluation of FBC
350
300
250
200
150
100
703...
702...
701...
700...
699...
698...
697...
700
650
600
550
500
450
400
350
300
2
1
0
-1
-2
FBC Off
FBC On
FBC Off
FBC Quantity
Engine Speed
19
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
FBC Fuel Balance Control
20
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
FBC Fuel Balance Control
FBC Calibration is dependent on engine and drive train behaviour
Change in engine/drive train mechanics requires new calibration or a
validation of the calibration
Typical changes are Flywheel, drive train, engine mounting
Change in drive train concept like manual to automatic gearbox
Often same engine on different vehicle requires validation
FBC cannot be calibrated on engine test bench
FBC is calibrated at the beginning of the vehicle calibration phase
FBC has to be validated on series intended vehicle
21
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFLZFL
ZeroFuel Calibrn @ Low Idle
22
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFC - Zero Fuel Calibration
Overview of ZFC
Application Boundary condition
Service Concept
23
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFC Zero Fuel Calibration
Goal
Compensation of pilot injection quantity drift over lifetime to comply with emissions in the long run
Function
Calibration of pilot injection quantity by engine speed signal by variation of energising time in overrun ( learning time upto 3000Km)
Pilot injection corrections are based on the learning
24
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFC Zero Fuel Calibration
25
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFC Zero Fuel Calibration
Application Boundary Conditions
ZFC should be Calibrated for
Each variant of engine / gearbox (PP batch vehicle with final hardware)
Application of each variant on roller test bench
Exact quantity should be measured, as basis for calibration
( eg.C-balance or Weighing method)
26
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFC Zero Fuel Calibration
Service Concept
ECU changed
- Read out of ZFC value from EEPROM of old ECU and copy to new ECU
All injectors changed
- Reset EEPROM ZFC value
One / more injector changed
- Reset EEPROM ZFC value of individual cylinder
27
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFLZFL
ZeroFuel Calibrn @ Low Idle
28
Quantity Correction Functions
Confidential | ENA32/Stk | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction,
editing, distribution, as well as in the event of applications for industrial property rights.
ZFL what does it mean?
Z F L
Zero Fuel
Energizing Time
Inje
cte
d Q
ty
Calibration
during
Low Idle
29
ZFL Overview
Confidential | ENA32/Stk | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction,
editing, distribution, as well as in the event of applications for industrial property rights.
Function Overview
Cylinder individual calibration of pilot injection quantity drift over lifetime
Calibration by evaluation of low idle governorw/o cylinder balancing
Calibration for SV injectors w/o plateau
Customer Benefit
Applications
Off highway (no overrun mode required)
1- and 2-cylinder engines (no cylinder balancing)
Open market business (no drive train dependency)
Due to noise during calibration not for PC
I
Low Idle governor
qact,PI_on = qact,PI_off
shut off PI
Tolerances
EDCMetering
qPI ~ (nPIMI nMI)
qSetPIMI MI
Compliance with exhaust gas emission levels
No additional sensor necessary
Low calibration effort
Fast learning cycle
Features
30
ZFL Overview
Confidential | ENA32\Stk | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction,
editing, distribution, as well as in the event of applications for industrial property rights.
31
ZFL Overview
Confidential | ENA32\Stk | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction,
editing, distribution, as well as in the event of applications for industrial property rights.
32
ZFL Overview
Confidential | ENA32\Stk | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction,
editing, distribution, as well as in the event of applications for industrial property rights.
Measurement Principle
Signal indicating PiI-quantity too low
nlow idle
1 2 3 4 1 2 3 4
Energizing
Current engine speed
Calibration Procedure:
Pilot Injection (PiI) is switched off every second camshaft revolution
Engine Speed Signal indicated PiI too low or PiI too high
Energising time of PiI is increased/decreased until correct PiI quantity
is reached
33
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
correction map (EEPROM)
ZFL calibration
in low idle
ETZFL
ETZFL
ETBase
(ET-Map, IQA)cyl
pRail
The difference between ET found by ZFL and base ET is filtered and
stored in a correction map.
Filtering is done to minimize noise influences.
The stored learning values are used to correct the energizing times in the
low quantity range.
Filtering and storage of learning values
34
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
ZFLZFL
ZeroFuel Calibrn @ Low Idle
35
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
PWC Pressure Wave Correction
Pressure in the line from the rail to the injector (HP line) is a function of the fuel quantity
It takes certain time for pressure to be stable.
Pline varies as a waveform during this period.
36
Quantity Correction Functions
Confidential | DS\ NE | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
PWC Pressure Wave Correction
37
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.
38
Quantity Correction Functions
Confidential | DS/ENA | 19/08/2010 | Bosch Limited 2010. All rights reserved, also regarding any disposal, exploitation, reproduction, editing,
distribution, as well as in the event of applications for industrial property rights.