View source for MDKOG 14.70 (Torque Coordination for Overall Interventions)

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

  
mdkog-main Main function overview

 
mdkog-bbmdein Sub-function BBMDEIN: active torque
intervention conditions

 
mdkog-bbzwein Sub-function BBZWEIN: active ignition
angle intervention conditions

 
mdkog-mdbeg Sub-function MDBEG: limit of the
indicated torque

 
mdkog-mdbeg-diag Sub-function MDBEG_DIAG: connection of the
torque limit to the diagnosis

 
mdkog-mdabws Sub-function MDABWS: stalling

  
<u>MDKOG 14.70 Function Description</u>

  
<u>Coordination of the Requested Engine Torques</u>

  
Through the torque coordination calculation, the indexed desired engine torque (misol_w) is used to calculate the fade out stage and/or the ignition angle adjustment. The externally-requested indexed torques from the cruise control (miasrs_w) and transmission protection (migs_w) and the internal torque requirements (e.g. driver requested torque, maximum engine speed or maximum load) will be converted into an indexed desired engine torque (misolv_w) via either a minimum or maximum range.

  
The desired torque for the ignition path is dependent on the enable condition B_zwvz (cf. BBMDEIN):

  
- When ignition angle interventions are enabled, mizsolv_w is calculated as follows:

 
The upper limit of the desired torque, misolv_w, is given by the product of optimal internal torque
(including lambda influence) and ignition angle (miopt_w ´ etazwb), then the torque requirements of the idle control dmllr_w (only proportional and differential components) and the anti-judder feature, dmar_w are added.

  
- When ignition angle interventions are not required, the basic torque mibas_w is used as the desired torque which depends only on the stipulated ignition and mixture-application efficiencies. The anti-judder feature intervention is also considered in this case.

  
<u>Sub-function BBMDEIN: Active Torque Intervention Conditions</u>

  
In
addition, via the traction control torque intervention, the condition flag
B_msr is set so that overrun fuel cut-off is prohibited (see %MDRED). During
cruise control intervention, the condition flag B_asr to cylinder suppression
is possible (see %MDRED). The condition flag B_mdein is used to disable the
misfire detection (see %DASE) and enable the anti-judder feature or idle speed
control (for B_mdein = 0). The condition flags B_zwvz and B_zwvs are
responsible for enabling the torque adjustment through ignition.

  
-
B_zwvz is set when the time frame level detects the need for an intervention. This
is the case at all operating points which require a torque reserve, i.e. idle,
catalyst heating, short journeys and for the dashpot driveability functions,
load shock attenuation, filtering for overrun fuel cut-off and short journeys.
When the clutch is also immediately released to avoid revving the engine. All
external intervention is detected by comparing mifa_w and misol_w.

  
An
ignition angle enable can also be made via the code word CWMDKOG, when the
desired the cylinder charge corresponds to the minimum cylinder charge. In
addition, if the difference between the actual cylinder charge and the minimum
cylinder charge is less than the delta value to be applied, data input to the
code word for the ignition angle can be enabled.

  
-
B_zwvs is set when either a timeframe intervention is submitted or a torque
influence from the anti-judder feature is required. The desired value is not
then switched to misol_w in the function %MDZW (torque influence on ignition),
however, the influence is activated.

  
<u>Sub-function MDABWS: Stalling</u>

  
Should
the engine speed during torque reduction through cruise control or transmission
protection fall under NASNOTTM, miext is immediately set equal to MDIMX so that
the two operations are prohibited. NASNOTKL is a function of engine
temperature, tmot.

  
<u>Sub-function
BBZWEIN: Active Ignition Angle Intervention Conditions</u>

  
see
BBMDEIN

  
<u>Sub-function
MDBEG: limit of the indicated torque</u>

  
The
two torque variables and misolv_w mizsolv_w are limited to the maximum indicated
torque miszul_w (from %MDZUL). This is to ensure that monitoring in level 2
only becomes active when the desired (and possibly limited) torque is not
converted correctly into an actual torque. The data input to KFMIZU will be aligned
to the level 2 permitted torque. Particularly in the application phase this can
prevent an unwanted torque monitoring response. By noting the value of B_mibeg
it is possible to detect whether a limitation of the desired torque has been
made.

  
To
test the data monitoring, there is a counter cmibeg_w that counts the number of
active limitations. The counter cmibeg_w is incremented with each rising edge
of B_mibeg. The counter is not active when the driver releases the throttle
pedal or the maximum value is reached (MAXWORD = 65,535). The value is cached
and only an error path enable or a power failure resets it.

  
<u>Sub-function MDBEG_DIAG: Connection of the Torque Limit to the Diagnosis</u>

  
This function MDBEG_DIAG is part of the EGAS monitoring concept (level 1). The desired torque MDBEG is limited to a maximum permissible torque, miszul_w. If this limit is active, the bit B_mibeg is set. In certain operating conditions (e.g. very cold engine and idle), this level-1-limit will be active, but only for a short time. If the limit B_mibeg is active for a longer time (e.g. 10 minutes),
there might be a fault in the system and a diagnostic entry is made.

  
<u>MDKOG
14.70 Application Notes</u>

  
Typical values:

  
MDIMX = 99.6%;

  
NASNOTKL

                
{| border="1"
|-
| 
Engine temperature/°C
| 
-30
| 
0
| 
30
| 
60
|-
| 
NASNOT
| 
1500
| 
900
| 
600
| 
600
|}  
The engine speed threshold NASNOT must not be larger than 2550 rpm.

  
DELRL &lt; 2%

 
THDMB = 1 sec

 
CWMDKOG = 2

                         
{| border="1"
|-
| 
Bit
| 
7
| 
6
| 
5
| 
4
| 
3
| 
2
| 
1
| 
0
|-
| 
CWMDKOG
| 
*
| 
*
| 
*
| 
*
| 
Note 4
| 
Note 3
| 
Note 2
| 
Note 1
|}  
Note 1. Ignition angle enable with rlsol = rlmin
 
Note 2. Ignition angle enable with B_mibeg
 
Note 3. Ignition angle enable with rl - rlmin_w £ DELRL
 
Note 4. !B_mibegl kill data input

                                                                                                      
{| border="1"
|-
| 
Parameter
| 
Description
|-
| 
CDCMDB
| 
Codeword CARB: torque limitation desired torque
|-
| 
CDKMDB
| 
Codeword Client: torque limitation desired torque
|-
| 
CDTMDB
| 
Codeword Tester: torque limitation desired torque
|-
| 
CLAMDB
| 
Codeword Error Class: torque limitation desired torque
|-
| 
CWMDKOG
| 
Codeword: MDKOG: ignition angle retardation via vacuum limitation
|-
| 
CWTEZW
| 
Codeword: ignition angle intervention via fuel tank breather valve check
|-
| 
CWZWVMX
| 
Codeword: ignition angle intervention via speed limitation
|-
| 
DELRL
| 
Delta relative cylinder charge for enabling ignition angle intervention
|-
| 
FFTMDB
| 
Freeze frame table: torque limitation desired torque
|-
| 
MDIMX
| 
Maximum indexed engine torque
|-
| 
NASNOTKL
| 
Characteristic curve for stall protection speed threshold
|-
| 
THDMB
| 
Healing debounce time of the entry error in long-term torque limitation
|-
| 
TMVER
| 
Debounce time detection of a long-term torque limitation
|-
| 
TSFMDB
| 
Error summation period: torque limitation desired torque
|-
| 
TVLDSZW
| 
Duty cycle ignition angle enable via recharge effect
|-
| 
TVMIBEG
| 
Debounce time for ignition angle enable via torque limitation
|-
| 
BLOKNR
| 
DAMOS source for block number
|-
| 
B_ASR
| 
Condition flag: cruise control active
|-
| 
B_BEMDB
| 
Condition flag: tape end functions requirement torque limitation
|-
| 
B_BKMDB
| 
Condition flag: torque monitoring (long-term limitation) active
|-
| 
B_CLMDB
| 
Condition flag: cancellation of long-term torque limitation
|-
| 
B_DASH
| 
Condition flag: dashpot-adjustment limit active
|-
| 
B_FIL
| 
Condition flag: PT1-filter for overrun fuel cut-off/reinstatement active
|-
| 
B_FTMDB
| 
Condition flag: error input from tester for torque limitation
|-
| 
B_KH
| 
Condition flag: catalyst heating
|-
| 
B_KUPPLV
| 
Condition flag: delayed clutch actuation
|-
| 
B_KW
| 
Condition flag: catalyst keep warm
|-
| 
B_LDSUA
| 
Condition flag: charge air recirculation valve active (open)
|-
| 
B_LL
| 
Condition flag: idle
|-
| 
B_LLREIN
| 
Condition flag: idle control active
|-
| 
B_LSD
| 
Condition flag: positive load change damping active
|-
| 
B_MDEIN
| 
Condition flag: torque intervention active
|-
| 
B_MDMIN
| 
Condition flag: minimum achievable indexed torque achieved
|-
| 
B_MGBGET
| 
Condition flag: torque gradient limitation active
|-
| 
B_MIBEG
| 
Condition flag: torque limitation active
|-
| 
B_MIBEGL
| 
Condition flag: torque limitation cylinder charge path active
|-
| 
B_MNMDB
| 
Fehlertyp min.: torque monitoring long-term limitation
|-
| 
B MSR
| 
Condition flag for torque slip control
|-
| 
B_MXMDB
| 
Error type: maximum permissible desired torque is exceeded permanently
|-
| 
B_NPMDB
| 
Implausible error: torque monitoring long-term limitation
|-
| 
B_PWF
| 
Condition flag: power fail
|-
| 
B_SA
| 
Condition flag: overrun fuel cut-off
|-
| 
B_SIMDB
| 
Error type: torque monitoring long-term limitation
|-
| 
B_STEND
| 
Condition flag: end of start conditions achieved
|-
| 
B_ZWGET
| 
Ignition angle intervention through transmission intervention
|-
| 
B_ZWNGET
| 
Ignition angle intervention not through transmission intervention
|-
| 
B_ZWVS
| 
Condition flag: for quick exit of ignition angle intervention in the
torque interface
|-
| 
B_ZWVZ
| 
Condition flag: for ignition angle intervention in the torque interface
|-
| 
B_ZWVZVB
| 
Condition flag: for ignition angle intervention in the torque interface for
limitation
|-
| 
CMIBEG_W
| 
Counter for active limitations of the internal torques
|-
| 
DFP_MDB
| 
ECU internal error path number: torque monitoring long-term limitation
|-
| 
DMAR_W
| 
Delta engine speed (anti judder)
|-
| 
DMLLR_W
| 
Demanded torque change for idle control (P &amp; D components)
|-
| 
DMRKH
| 
Torque reserve for catalyst heating
|-
| 
DMRKT_W
| 
Torque reserve for short journeys
|-
| 
DMRLLR_W
| 
Torque reserve for idle control
|-
| 
DMZMS_W
| 
Difference between the indexed desired torque and the allowed desired
torque
|-
| 
ETAZWB
| 
Ignition angle efficiency of the basic ignition angles
|-
| 
E_MDB
| 
Error flag: torque monitoring long-term limitation
|-
| 
MIASRL_W
| 
Indexed desired engine torque (cruise control), slow intervention
|-
| 
MIASRS_W
| 
Indexed desired engine torque (cruise control), fast intervention
|-
| 
MIBAS W
| 
Indexed basic torque
|-
| 
MIBEG_W
| 
Torque limit
|-
| 
MIBGR_W
| 
Indexed desired torque for input-dependent clutch torque limitation
|-
| 
MIEXTV_W
| 
For external demanded torque for stall protection
|-
| 
MIEXT_W
| 
For external (cruise control, transmission protection, etc.) demanded
indexed engine torque
|-
| 
MIFAB_W
| 
Limited indexed driver’s desired torque
|-
| 
MIFA_W
| 
Indexed driver’s desired torque
|-
| 
MIGS_W
| 
Indexed desired engine torque for transmission protection, fast
intervention
|-
| 
MILRES_W
| 
Torque requirement for air path with all reserves
|-
| 
MIMAX_W
| 
Maximum achievable indexed torque
|-
| 
MIMSR W
| 
Indexed desired engine torque, traction control
|-
| 
MINMX_W
| 
Torque requirement of the speed limiter
|-
| 
MIOPT W
| 
Optimum indexed torque
|-
| 
MISOLP_W
| 
Indexed desired torque for torque limitation, local variable
|-
| 
MISOLV_W
| 
Indexed resulting torque for torque limitation
|-
| 
MISOL_W
| 
Indexed resulting desired torque
|-
| 
MISZUL_W
| 
Maximum possible indexed torque
|-
| 
MITEBG_W
| 
Torque target for minimum filling fuel tank breather
|-
| 
MIVMX_W
| 
Indexed desired torque for speed control
|-
| 
MIZSOLV_W
| 
Indexed resulting desired torque for ignition angle intervention for torque
limitation
|-
| 
MIZSOL_W
| 
Indexed resulting desired torque for ignition angle intervention
|-
| 
NASNOTTM
| 
Speed threshold for stall protection as a function of engine speed
|-
| 
NMOT
| 
Engine speed
|-
| 
RLMIN_W
| 
Minimum possible relative cylinder charge
|-
| 
RLSOL_W
| 
Desired cylinder charge
|-
| 
RL_W
| 
Relative cylinder charge (word)
|-
| 
SFPMDB
| 
Error path status: torque monitoring, long-term limitation
|-
| 
TMOT
| 
Engine temperature
|-
| 
WPED_W
| 
Normalised throttle pedal angle
|-
| 
Z_MDB
| 
Cycle flag: torque limitation, long-term limitation
|}

[[Category:ME7]]