Quantity Corrections.pdf
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Quantity Correction Functions
Quantity Correction Functions
1
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
ZFL Zero Fuel Calibrn @ Low Idle
2
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
ZFL Zero Fuel Calibrn @ Low Idle
3
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
Injector Quantity Adjustment (IQA) Concept Effect of IMA Advantages
4
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.
Quantity Correction Functions
Injector – Quantity – Adjustment (IQA/IMA)
5
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.
Quantity Correction Functions
Injector Quantity Adjustment (IQA)
6
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
Injector Quantity Adjustment (IQA/IMA)
7
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.
Quantity Correction Functions
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)
8
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
Injector Quantity Adjustment (IQA/IMA)
9
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.
Quantity Correction Functions
Injector Quantity Adjustment (IQA/IMA) Programming of the Control Unit (ECU)
10
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
Injector Quantity Adjustment (IQA/IMA) Processes for EOL-Programming
11
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
ZFL Zero Fuel Calibrn @ Low Idle
12
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
FBC – Fuel Balance Control FBC – Overview Benefit for Emission Application Boundary condition
13
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.
Quantity Correction Functions
FBC – Fuel Balance Control Features 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
14
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.
Quantity Correction Functions
FBC – Fuel Balance Control
15
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.
Quantity Correction Functions
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
16
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
FBC Evaluation FFT Analysis – Engine Speed 5 Ep m _ n En g _ w /o FBC Ep m _ n En g _ w i th FBC 4 .5
4
3 .5
3
2 .5
FBC benefit
2
1 .5
1
0 .5
0
0
5
10
15
20
25
30
35
Fre q u e n cy [H z]
FFT Analysis shows benefit of FBC at CaS, 2CaS and 3CaS 17
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.
Quantity Correction Functions
Evaluation of FBC 700 2
FBC Off
FBC Off
650 600 1 550 500 0 450 400 -1 350
FBC Quantity
300 -2
FBC On
350
703...
300 702... 701... 250 700... 200 699...
150
698...
100
697...
Engine Speed
18
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
FBC – Fuel Balance Control
19
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.
Quantity Correction Functions
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
20
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.
Quantity Correction Functions
ZFL Zero Fuel Calibrn @ Low Idle
21
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
ZFC - Zero Fuel Calibration Overview of ZFC Application Boundary condition Service Concept
22
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.
Quantity Correction Functions
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
23
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.
Quantity Correction Functions
ZFC –Zero Fuel Calibration
24
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.
Quantity Correction Functions
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)
25
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.
Quantity Correction Functions
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
26
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.
Quantity Correction Functions
ZFL Zero Fuel Calibrn @ Low Idle
27
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
ZFL – what does it mean?
ZFL Calibration during
Injected Qty
Zero Fuel
Low Idle Energizing Time
28
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 Overview
Function Overview Features
EDC Low Idle governor
I
Metering
shut off PI
qSet PIMI MI
qact,PI_on = qact,PI_off
Applications
Tolerances
∆qPI ~ (nPIMI – nMI)
Cylinder individual calibration of pilot injection quantity drift over lifetime Calibration by evaluation of low idle governor w/o cylinder balancing Calibration for SV injectors w/o plateau
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
Customer Benefit
29
Compliance with exhaust gas emission levels No additional sensor necessary Low calibration effort Fast learning cycle
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 Overview
30
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 Overview
31
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 Overview
Measurement Principle Energizing
1
2
Current engine speed
3
4
1
2
3
4
Signal indicating PiI-quantity too low
nlow idle
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 32
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.
Quantity Correction Functions
Filtering and storage of learning values ZFL calibration in low idle
ETZFL
pRail ∆ETZFL
ETBase
cyl
(ET-Map, IQA) correction map (EEPROM)
33
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.
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
ZFL Zero Fuel Calibrn @ Low Idle
34
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
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.
35
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.
Quantity Correction Functions
PWC – Pressure Wave Correction
36
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.
Quantity Correction Functions
37
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
38
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
1
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
ZFL Zero Fuel Calibrn @ Low Idle
2
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
ZFL Zero Fuel Calibrn @ Low Idle
3
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
Injector Quantity Adjustment (IQA) Concept Effect of IMA Advantages
4
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.
Quantity Correction Functions
Injector – Quantity – Adjustment (IQA/IMA)
5
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.
Quantity Correction Functions
Injector Quantity Adjustment (IQA)
6
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
Injector Quantity Adjustment (IQA/IMA)
7
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.
Quantity Correction Functions
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)
8
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
Injector Quantity Adjustment (IQA/IMA)
9
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.
Quantity Correction Functions
Injector Quantity Adjustment (IQA/IMA) Programming of the Control Unit (ECU)
10
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
Injector Quantity Adjustment (IQA/IMA) Processes for EOL-Programming
11
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
ZFL Zero Fuel Calibrn @ Low Idle
12
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
FBC – Fuel Balance Control FBC – Overview Benefit for Emission Application Boundary condition
13
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.
Quantity Correction Functions
FBC – Fuel Balance Control Features 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
14
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.
Quantity Correction Functions
FBC – Fuel Balance Control
15
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.
Quantity Correction Functions
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
16
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
FBC Evaluation FFT Analysis – Engine Speed 5 Ep m _ n En g _ w /o FBC Ep m _ n En g _ w i th FBC 4 .5
4
3 .5
3
2 .5
FBC benefit
2
1 .5
1
0 .5
0
0
5
10
15
20
25
30
35
Fre q u e n cy [H z]
FFT Analysis shows benefit of FBC at CaS, 2CaS and 3CaS 17
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.
Quantity Correction Functions
Evaluation of FBC 700 2
FBC Off
FBC Off
650 600 1 550 500 0 450 400 -1 350
FBC Quantity
300 -2
FBC On
350
703...
300 702... 701... 250 700... 200 699...
150
698...
100
697...
Engine Speed
18
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
FBC – Fuel Balance Control
19
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.
Quantity Correction Functions
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
20
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.
Quantity Correction Functions
ZFL Zero Fuel Calibrn @ Low Idle
21
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
ZFC - Zero Fuel Calibration Overview of ZFC Application Boundary condition Service Concept
22
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.
Quantity Correction Functions
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
23
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.
Quantity Correction Functions
ZFC –Zero Fuel Calibration
24
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.
Quantity Correction Functions
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)
25
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.
Quantity Correction Functions
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
26
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.
Quantity Correction Functions
ZFL Zero Fuel Calibrn @ Low Idle
27
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
ZFL – what does it mean?
ZFL Calibration during
Injected Qty
Zero Fuel
Low Idle Energizing Time
28
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 Overview
Function Overview Features
EDC Low Idle governor
I
Metering
shut off PI
qSet PIMI MI
qact,PI_on = qact,PI_off
Applications
Tolerances
∆qPI ~ (nPIMI – nMI)
Cylinder individual calibration of pilot injection quantity drift over lifetime Calibration by evaluation of low idle governor w/o cylinder balancing Calibration for SV injectors w/o plateau
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
Customer Benefit
29
Compliance with exhaust gas emission levels No additional sensor necessary Low calibration effort Fast learning cycle
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 Overview
30
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 Overview
31
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 Overview
Measurement Principle Energizing
1
2
Current engine speed
3
4
1
2
3
4
Signal indicating PiI-quantity too low
nlow idle
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 32
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.
Quantity Correction Functions
Filtering and storage of learning values ZFL calibration in low idle
ETZFL
pRail ∆ETZFL
ETBase
cyl
(ET-Map, IQA) correction map (EEPROM)
33
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.
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
ZFL Zero Fuel Calibrn @ Low Idle
34
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
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.
35
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.
Quantity Correction Functions
PWC – Pressure Wave Correction
36
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.
Quantity Correction Functions
37
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
38
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.
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