Lambda component protection (LAMBTS)

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This is a translation from the Funktionsrahmen


LAMBTS Abbreviations

Parameter Source-X Source-Y Type Designation
CWLAMBTS FW Code word: Lambda component protection
DTBTS FW Temperature hysteresis for component protection
DTWILABTS FW Charger temperature hysteresis for component protection
DTWISBTS FW Temperature hysteresis for bridge component protection
ETADZW DZWG KL ZW-efficiency as a function of delta ZW
FBSTABGM TABGBTS_W KL Factor component protection depending on model. Exhaust gas temperature
KFDLBTS DETAZWBS NMOT KF Delta Lambda set for component protection
KFFDLBTS NMOT RL_W KF Delta Lambda factor set for component protection
KFLBTS NMOT RL_W KF Lambda set for component protection
KFLBTS2 NMOT RL_W KF Lambda set for component protection
SNM16GKUB NMOT SV Interpolation points distribution mixture control 16 nmot Interpolation points
SRL12GKUW RL_W SV Interpolation points distribution mixture control 12 rl_w Interpolation points
SY_ATMLA SYS (REF) SYStem constant exhaust gas temperature model loaders available
SY_ATMST SYS (REF) SYStem constant exhaust gas temperature model available bridge
SY_STERBTS SYS (REF) Constant exhaust SYStem component protection bank Selective
SY_TURBO SYS (REF) Turbocharger SYStem constant
TABGBTS FW Exhaust temperature threshold for component protection
TDLAMBTS FW off delay time for release lambda component protection
TIKATBTS FW Temperature threshold in the cat for component protection
TKATBTS FW Kat-temperature threshold for component protection
TVLBTS FW Lag time lambda desired component protection
TWILABTS FW Charger temperature threshold for component protection
TWISTBTS FW bridge temperature threshold for component protection
ZDLBTS FW Time constant lambda delta component protection
ZLBTS FW Time constant lambda component protection
Variable Source Type Designation
B_DASH MDFAW EIN Condition: dashpot-change limit active
B_GSAF CAN EIN Condition transmission shift operation request
B_TABGBTS LAMBTS LOK Exhaust temperature condition for component protection exceeded
B_TATMBTS LAMBTS LOK Condition: Temperature from ATM exceeded for component protection
B_TIKATBTS LAMBTS LOK Temperature condition in the cat exceeded for component protection
B_TKATBTS LAMBTS LOK Catalyst temperature condition for component protection exceeded
B_TWILABTS LAMBTS LOK Temperature condition loader for component protection exceeded
B_TWISTBTS LAMBTS LOK bridge condition temperature for component protection exceeded
DETAZWBS LAMBTS LOK Delta ZW efficiency for component protection
DLAMBTS_W LAMBTS LOK Delta Lambda for component protection
DZWG LAMBTS AUS Delta ignition due to Optimal-ZW-ZW
ETAZWG LAMBTS LOK Efficiency in the basic ignition
ETAZWIM LAMBTS LOK Mean efficiency in the actual firing angle
ETAZWIST MDIST EIN Actual ignition angle
FLBTS_W LAMBTS LOK Lambda factor component protection
LAMBTS2_W LAMBTS AUS Lambda for component protection Bank2
LAMBTS_W LAMBTS AUS Lambda for component protection
LBTS2_W LAMBTS LOK Lambda for component protection from stationary map Bank2
LBTS_W LAMBTS LOK Lambda for component protection from stationary map
RL_W EGFE EIN relative air charge (Word)
SY_LAMBTS PROKONAL EIN SYStem constant component protection available
TABGBTS_W LAMBTS LOK Exhaust gas temperature for component protection
TABGKRM_W ATM EIN Exhaust gas temperature in the manifold of model
TABGM_W ATM EIN Exhaust temperature before the catalytic converter from model (Word)
TIKATM_W ATM EIN Exhaust gas temperature in the catalyst of model
TKATM_W ATM EIN Catalyst temperature from model (Word)
TWILAM_W EIN Wall temperature from model loaders
TWISTM_W EIN Cylinder head temperature model from [K] in VS100 visible in [deg C]
ZWGRU ZWGRU EIN Basic ignition
ZWOPT MDBAS EIN optimum firing angle

LAMBTS Functional Description


Protection of components (manifold, supercharger turbine, etc.) by mixture enrichment.


Excessive exhaust gas temperature (EGT) can be reduced by enriching the air-fuel mixture. This provides more highly enriched fuel into the cylinder than for a true stoichiometric mix. Combustion of the mixture is therefore incomplete due to insufficient oxygen. The unburned fuel condenses on the cylinder walls and transfers exhaust energy with it, thereby the exhaust gas temperature decreases.

LAMBTS: Description

Via the map KFLBTS can be dependent on the function of speed nmot and charge rl rich a lambda setpoint shift to make. The enrichment is only effective when the modeled temperatures tabgm_w, tkatm_w, tikatm_w or twistm_w in Partial function LAMBTSENABLE exceeds its applicable threshold and the switch delay time expired TDLAMBTS + TVLBTS is. Via the SYStem constant SY_ATMST can be defined whether the function exists twistm_w% ATMST and about the SY_ATMLA SYStem constant can be defined, whether twilam_w available from the function is ATMLA%. The map describes the stationary KFLBTS necessary enrichment, whereas the curves of the model temperatures, the dynamics describe.

This avoids that is enriched in short-term approach to a stationary critical operating point too early. The temperature hysteresis DTBTS DTWISBTS or prevent a periodic switching on and off of enrichment if, in the enrichment A temperature occurs which is below the cut-in. For projects with Stereo exhaust SYStem, where the exhaust temperatures of the two banks within the same operating point very strongly can differ, via the SYStem constant SY_STERBTS = true protection of the components over the maps KFLBTS, KFLBTS2 separated for both banks will be applied.

When deterioration of the ignition angle efficiency leads to an increase in the exhaust gas temperature. This increase can be with a mixture enrichment counteract (see Part DLAMBTSZW function). For this, the ignition angle efficiency etazwg the basic ignition angle and the ignition point ZWGRU average efficiency ignition angle when etazwim Actual ignition calculated firing angle. The difference of etazwg and etazwim results in the degradation efficiency detazwbs. Dependent on detazwbs can now via the map KFDLBTS an additive enrichment be carried out. The enrichment can be used in the desired range by means of the characteristic KFFDLBTS (nmot, rl) attenuated or eliminated. Again, this enrichment is only effective if one of the modeled exhaust temperatures below their corresponding threshold over. With the time delay TVLBTS, a short-term exceeding of the critical temperature components are allowed. Must first be However, the time TDLAMBTS have expired. With the low-pass filter ZDLBTS one has the possibility that otherwise abrupt enrichment to be ground upon reaching the critical component temperature.

Special thanks to phila_dot for translating this section.

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