gf0761p3020f

ME-SFI two-sensor control, function

Type gf · emne 07.61 · version 0124 · 2008-04-04

Gælder for: ENGINES 104.941 /943 /944 /991 /994 as of 1.8.96 with CODE (494) USA version ENGINES 104.995 with CODE (494) USA version ENGINES 111.921 /942 as of 1.9.98, 111.943, 111.944 as of 1.8.96, 111.946 as of 1.6.98, 111.947 /973, 111.975 as of 1.8.96 with CODE (494) USA version ENGINES 111.945 in model 202.020 /080 as of 1.9.98, 208.335 /435 as of 1.6.98 with CODE (494) USA version ENGINES 111.952 /956 /957 /958 /982 /983 ENGINES 111.974, 112.970 /972 with CODE (494) USA version ENGINES 112.910 /

Ikke tilgængelig på “da”; vises på Engelsk.

Placering

Funktionsgruppe 1 Motor › 07 Blandingstilberedning › 07.61 Benzinindsprøjtnings- og tændingssystem ME — Serie 202 (modeller 020, 080) · Serie 208 (modeller 335, 435)

Gælder også for motorer/gearkasser: 104 941, 104 943, 104 944, 104 991, 104 994, 104 995, 111 921, 111 942, 111 943, 111 944, 111 945, 111 946, 111 947, 111 951, 111 952, 111 955, 111 956, 111 957, 111 958, 111 973, 111 974, 111 975, 111 982, 111 983, 112 910, 112 911, 112 912, 112 913, 112 914, 112 916, 112 917, 112 920, 112 921, 112 922, 112 923, 112 940, 112 941, 112 942, 112 943, 112 944, 112 946, 112 947, 112 949, 112 953, 112 954, 112 955, 112 970, 112 972, 112 973, 112 975, 113 940, 113 941, 113 942, 113 943, 113 948, 113 960, 113 961, 113 963, 113 965, 113 966, 113 967, 113 968, 113 969, 119 980, 119 981, 119 982, 119 985, 120 982, 120 983, 137 970

GF07.61-P-3020F

ME-SFI two-sensor control, function

20.3.08

ENGINES 104.941 /943 /944 /991 /994 as of 1.8.96 with CODE (494) USA version

ENGINES 104.995 with CODE (494) USA version

ENGINES 111.921 /942 as of 1.9.98,
111.943,
111.944 as of 1.8.96,
111.946 as of 1.6.98,
111.947 /973,
111.975 as of 1.8.96 with CODE (494) USA version

ENGINES 111.945
in model 202.020 /080 as of 1.9.98,
208.335 /435 as of 1.6.98 with CODE (494) USA version

ENGINES 111.952 /956 /957 /958 /982 /983

ENGINES 111.974, 112.970 /972 with CODE (494) USA version

ENGINES 112.910 /911 /912 /913 /914 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /947 /949 /954 /955 /975
with CODE (925) Low emission EURO3
with CODE (926) Low emission EURO4
with CODE (494) USA version

ENGINES 113.940 /941 /942 /943 /948 /960 /961 /965 /966 /967 /968 /969
with CODE (925) Low emission EURO3
with CODE (926) Low emission EURO4
with CODE (494) USA version

ENGINES 119.980 /981 /982 /985 with CODE (494) USA version

ENGINES 120.982 /983 with CODE (494) USA version

ENGINES 137.970

ENGINES 111.951 /955 up to Model Year 08 /Modification Year 07

ENGINES 112.916 /946 /953 /973
with CODE (926) Low emission EURO4
with CODE (494) USA version
up to Model Year 08 /modification year 07

ENGINES 113.963
with CODE (925) Low emission EURO3
with CODE (926) Low emission EURO4
with CODE (494) USA version
up to Model Year 08 /modification year 07

Task

Improving the stability of the lambda control.

Monitoring O2 sensor upstream of TWC.

Engine

Lambda control

Catalytic converter

Monitoring

Cycle duration

Monitoring

Limit values

O2 sensor

upstream TWC

O2 sensor

downstream TWC

Correction variable for lambda closed-loop control

Specified/actual value comparison

ME-SFI two-sensor control, function

P07.61-0383-06

1 O2 sensor signal upstream of TWC

a Voltage threshold for

b Rich - lean transition

c Lean - rich transition

2 Lambda control without correction variable

3 Lambda control with
correction variable (d), timing variation
(+TV) in rich direction

4 Lambda control with
correction variable (e), timing variation
(-TV) in lean direction

The engine control unit determines the lambda mean value from signals from the O2 sensors downstream of TWC. This value is compared with a stored value for optimum exhaust emissions.

If the variation of several measurements is too large, a correction variable (lag time TV) is determined for the lambda control.

Use of the correction factor (value for a new O2 probe about 0) allows one to compensate for aging of the O2 probe upstream of the catalytic converter within certain limits. If the correction variable exceeds the limit value, the O2 sensor upstream of TWC must be replaced.

In addition, allowance is made for the period of the signal supplied by the sensor upstream of TWC. If no sensor state change takes place, the lambda control is not active and therefore a two-sensor control is not possible either.

The effect of the firewall catalytic converters is monitored based on the O2 sensor signals downstream of the TWC.

ME-SFI control unit, location/task/design/function

Other than engine 111 EVO

GF07.61-P-5000F

Engine 111 EVO

GF07.61-P-5000GS

O2 sensors, location/task/design/function

GF07.04-P-4103F

Three-way catalytic converter, location/task/design/function

GF49.10-P-3002F

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