View source for ZUE 282.130 (Fundamental Function - Ignition)

See the ''funktionsrahmen'' for the following diagrams:

zue-zue

zue- dzwll

  
<u>ZUE 282.130 Function Description</u>

The ignition angle (zwgru) from the fundamental ignition angle calculation is corrected by the warm-up angle (dzwwl) and the cylinder-specific knock control angle (dwkrz), and it follows that the basic ignition angle (zwbas) is identical with the earliest possible ignition angle. This ignition angle now forms the route in to the ignition engine torque implementation (MDZW), which provides the output ignition angle (zwsol). This ignition angle is now limited to the earliest or latest possible ignition angle. The resulting ignition angle (zwist) is corrected by the phase error which gives the output ignition angle (zwout).

  
For back-up protection of the ignition angles, the one’s complement (i.e. inverse binary value) of zwout is calculated which forms zwoutcpl. This then becomes the input variable of the function monitor.

  
The cylinder bank selective ignition angle adjustment is activated via the codeword CWDZWLL = 1.

The delta ignition angle (dzwll) corresponding to B_bankl2 is added to, or subtracted from zwsol.

<u>ZUE 282.130 Application Notes</u>

Three interfaces are provided for the application; the RAM cell vszw and the fixed value ZWAPPL ZW enable adjustment of application tools. Engagement of the torque functions can be disabled using the codeword CWMDAPP (bit 0), so that the applied ignition angle (zwbas) can be driven directly.


<u>Abbreviations</u>
                                                                  
{| border="1"
|-
| 
Parameter
| 
Description
|-
| 
CWZWBANK
| 
Codeword for enabling cylinder-specific ignition angle offsets
|-
| 
FZIZWV
| 
Factor for torque correction via cylinder-specific ignition angle
adjustment
|-
| 
KFDZWLL
| 
Map for delta ignition angle during idle
|-
| 
KLZWBSMN
| 
Latest possible basic ignition angle
|-
| 
TMZIZWV
| 
Engine temperature threshold for enabling cylinder-specific ignition
angle adjustment
|-
| 
VZIZWV
| 
Vehicle speed threshold for disabling cylinder-specific ignition angle
adjustment
|-
| 
WPHN
| 
Phase response
|-
| 
ZWAPPL
| 
Application interface: ignition angle adjustment
|-
| 
Variable
| 
Description
|-
| 
B_BANK2
| 
Condition flag for cylinder bank 2
|-
| 
B_LL
| 
Condition flag for idle
|-
| 
B_LLREIN
| 
Condition flag for idle control active
|-
| 
B_NOZWE
| 
Condition flag for no ignition angle intervention in the torque structure
|-
| 
B_SA
| 
Condition flag for overrun fuel cut-off
|-
| 
B_ZWAPPL
| 
Condition flag for ignition angle application without torque intervention
|-
| 
B_ZWKRA
| 
Condition flag for ignition angle output during knock regulation
|-
| 
CWDZWLL
| 
Codeword for delta ignition angle during idle active
|-
| 
DWKR
| 
Cylinder-specific ignition angle retardation during knock control
|-
| 
DZWBANK
| 
Cylinder bank-specific ignition angle offset
|-
| 
DZWOB
| 
Delta ignition angle during overboost
|-
| 
DZWWL
| 
Delta ignition angle during warm-up
|-
| 
DZWZK
| 
Delta ignition angle during knock
|-
| 
MISOLZ_W
| 
Indicated resulting desired torque for ignition angle intervention
|-
| 
MIZSOL_W
| 
Indicated resulting desired torque for ignition angle intervention
|-
| 
NMOT
| 
Engine speed
|-
| 
NSOL
| 
Desired idle speed
|-
| 
REDIST
| 
Actual reduction stage
|-
| 
RL
| 
Relative cylinder charge
|-
| 
SY_REDMX
| 
System constant: maximum reduction stage
|-
| 
SY_TDZW
| 
System constant: additive ignition angle adaptation active
|-
| 
SY TURBO
| 
System constant: turbocharger
|-
| 
SY_WMAX
| 
System constant: earliest outputtable ignition angle
|-
| 
SY_WMIN
| 
System constant: latest outputtable ignition angle
|-
| 
SY_ZIZWV
| 
''Text must be provided by Mrs
Sauer''
|-
| 
SZOUT_W
| 
Closing time output
|-
| 
TMOT
| 
Engine temperature
|-
| 
VFZG
| 
Vehicle speed
|-
| 
VSTDZW
| 
Additive ignition angle adaption
|-
| 
VSZW
| 
Ignition angle correction adjusting system
|-
| 
WKRDY
| 
Ignition angle retardation via dynamic knock regulation
|-
| 
WPHG
| 
Ignition angle speed sensor phase correction
|-
| 
ZNACHANZ
| 
Number of ignitions in overrun
|-
| 
ZWBAS
| 
Basic ignition angle
|-
| 
ZWDLLPRT
| 
Ignition angle pointer with delta idle ignition angle
|-
| 
ZWGRU
| 
Fundamental ignition angle
|-
| 
ZWIST
| 
Actual ignition angle
|-
| 
ZWOUT
| 
Ignition angle output
|-
| 
ZWOUTCPL
| 
One’s complement of the ignition angles for function monitoring
|-
| 
ZWOUTPRT
| 
Ignition angle pointer
|-
| 
ZWSOL
| 
Desired ignition angle for torque intervention
|-
| 
ZWSPAE
| 
Latest ignition angle
|-
| 
ZWSTT
| 
Ignition angle during start
|-
| 
ZWZYL1
| 
Ignition angle for cylinder 1
|-
| 
ZZYLZUE
| 
Dwell angle-cylinder counter for calculating ignitions
|}

[[Category:ME7]]