Revision as of 05:54, 2 June 2011

This is a translation from the Funktionsrahmen

LAMFAW Abbreviations

LAMFAW Functional Description

The function LAMFAW lamfa_w implemented by way of an "enrichment" of the mixture when the driver calls for maximum torque by way of mrfa_w. This corresponds to the full-load enrichment since then. Can over the delay time of the engagement by way of TLAFA lamfa_w on the Mixture may be delayed. While the turbocharger boost over an additives has additionally "enrichment" is a Delta-Lambda from the characteristic DLAMOB. For the time TLAMFAS can as a function of height (LAMFAS) an enrichment by way of driver's request to be prevented (see sub-function LAMFADISABLE. The trigger this time will be lost if B_kh = true, LAMFA <1.0 and as defined in LAMFAS High barrier applies. This may also at greater height of a reproducible driving cycle can be maintained. When torque reduction e.g. ASR intervention, nmax .. can about CWMFAW Bit1 = true, the enrichment by way of the map LAMFAW locked be. In the partial function LAMKR intervened in an enrichment ignition angle can be realized. The partial function can be used for enrichment LAMWL whereas the warm-up can be used. If this procedure is used, the Tanks with air cooling over the function LAMKO not switched off. In the partial function is LAMRLMIN with small loads (rl) an enrichment by way of LAMRLMN active. This serves to improve the Flammability of small loads. If CWLAMFAW Bit2 set, then whereas lamrlmn-intervention of the limp mode canister ventilation closed.

LAMFAW Application Notes

The delay time is only TLAFA> 0 to apply when the intervention should be delayed mixture of lamfa_w.

LAMFA map:

Interpolation points for nmot: 1000, 1400, 1800, 2200, 2600, 3000, 3400, 3800, 4200, 4600, 5000, 5400, 5800, 6200, 6600, 7000 1/min Interpolation points for mrfa_w 70, 80, 90, 100, 110, 120% Map values 1.0

DLAMOB contains the delta-lambda, to which shall be implemented in overboost mode an extra mixture enrichment. Interpolation points nmot for: implements as a group characteristic SNM06GKUB

Neutralization of the function by data:

LAMFA DLAMOB = 1.0 and = 0.0 ---> lamfa_w is then 1.0

The time TLAMFAS is to be applied so that when the "big climbs" the driver's enrichment is not active (typically 240s)

The characteristic LAMFAS contains values ??from 0 .. 1. A value of 0 no enrichment is effectively banned on the air. Values other than 0 bring about a ban on the enrichment of LAMFA, when are B_kh = true and values ??in LAMFA <1.0 The characteristic LAMFAS is not interpolated, which means that the characteristic initial value remains constant until a reference point exceeded.

For fho-support points of the curve LAMFAS following relationship: fho = 1 - height [m] / 10000m Since the size of fho has a quantization of 4 / 256 = 0.015625, in the definition of switch-off this resolution be considered. Similarly, the basis of the sensor tolerance possible height deviation of + - 250 m

To calculate the lower and upper threshold of fho is valid for a nominal cut-off levels following relationship:

lower threshold high shutdown:

fho [phys] = 1 - ((nominal height [m] -250) / 10000) -> fho [Ink] = Integer (fho [phys] / 0.015625) + 1Ink
                                            -> fho ceiling [phys] = (1 - fho [Ink] * 0.015625)
                                            -> height limit = (1 - fho ceiling [phys]) * 10000

upper threshold high shutdown:

fho [phys] = 1 - ((nominal height [m]+ 250) / 10000) -> fho [Ink] = Integer (fho [phys] / 0.015625)
                                            -> fho lower limit [phys] = fho [Ink] * 0.015625
                                            -> height limit = (1 - fho lower limit [phys]) * 10000

This produces the following values

Nominal height                     2200m   1600

 Ceiling height of                  2500m   1875m
                                                     !!!!! Ceiling height is fho lower limit
 fho lower limit                    0.75    0.8125

 Height limit                       1875m   1250m

 fho limit                          0.8125  0.875

 Thus, the following parameterization of the curve LAMFAS for the nominal amount of 2200:

                           fho         0.734375      0.75     0.8125
                           Values ??0                    1.0      0
 Enrichment active <-------+                         +------> enrichment active
                                       <--+--->
                                                            + - enrichment inactive
 Shutdown of the height dependent suppression of enrichment: LAMFAS = 0, = 0 TLAMFAS

Lambda values for engagement in lamfawkr_w ignition retard:

 ZKLAMFAW: 2 s
 ZKWLAFWL: 2 s
 DLAMFAW: 0.01

 KFLAMKR:  Interpolation points nmot:     Group characteristics SNM06GKUB
           Interpolation points rl:       Group characteristics SRL06GKUB
           Map items                      complete 1.0 ---> no weighting active

 KFLAMKRL: Interpolation points dzlamfaw: Group characteristics SDZ06GKUB
           Interpolation points rl:       group characteristic SRL06GKUB
           Map items                      complete 1.0 -> Lambda intervention is not active

 DLAMTANS: Interpolation points tans:     50.25 60,  70.5,  80.25 C
           Map values ??completely 0 -> Lambda intervention is not active

 KFLAFWL:  Interpolation points nmot:     Group characteristics SNM06GKUB
           Interpolation points  rl:      Group characteristics SRL06GKUB
           Map values??:                    completely 0 -> Lambda intervention is not active
                                          ! In the map delta values are entered, -0.1 -> lamfwl_w = 0.9

 DLAMOB:  Interpolation points nmot:      Group characteristics SNM06GKUB
          Map values??;                     complete 0 -> no ADDITIONAL enrichment in turbo overboost
                                          ! In the map-delta values are entered +0.1 ---> lamfa = lamfaw - 0.1

 RLLAMMN: Interpolation points nmot:      Group characteristics SNM06GKUB
          Characteristic values:          0% -> not about enriching LAMRLMN active

 LAMRLMN: Interpolation points nmot:      Group characteristics SNM06GKUB
          Characteristic values??:          1.0 -> lambda = 1.0 (no enrichment)

 CWLAMFAW Bit0: 0: dzwlamfaw = min (0, dzwwl)
                1: dzwlamfaw = min (0, (+ dzwwl wkrma)) default = 0

 CWLAMFAW Bit1: 0: LAMFAW example, even with torque reduction on ASR, nmax .. active
                1: no enrichment of LAMFAW at torque reduction (milsol <MIFA)

 CWLAMFAW Bit2: 0: B_ldeffw is always false -> tank ventilation emergency active when lamrlmn_w engagement
                1: B_ldeffw lamrlmn_w dependent activation if B_ldeffw = true,
                   Tank vent blocked emergency, i.e. TEV includes

 CWLAMFAW Bit3: 0: ban Lambda-FW-activation possible by catalytic converter heating
                1: ban Lambda-FW-activation by catalytic converter heating is not possible

 CWLAMFAW bit4: 0: lamfwl_w dependent on B_stend and VZ1-element
                1: lamfwl_w independent of B_stend and VZ1-element
 
 Group characteristic for nmot Interpolation points:      SNM06GKUB 760, 1520, 2560, 3520, 4560, 5520 1/min
 Group characteristic for rl Interpolation points:        SRL06GKUB  20,   40,   60,   80,  90%
 Group characteristic for tmot Interpolation points:      STM08GKUB -15,    0,   20, 40.5,   60,         75, 85.5, 105 C
 Group characteristic for dzwlamfaw Interpolation points: SDZ06GKUB -30,  -20,  -15,  -10,   -5,   0 degree

Special thanks to phila_dot for translating this section.