gf0761p4022f

ME-SFI lambda control, function

ประเภท gf · หัวข้อ 07.61 · เวอร์ชัน 0121 · 2009-02-02

ใช้กับ: ENGINES 104.941 /943 /944 /991 /994 as of /96 ENGINES 104.995 with CODE (494) USA version with CODE (807) model year 1997 with CODE (808) model year 1998 with CODE (498) as of model year 1997 Japan 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 /952 /956 /957 /958 /973, 111.975 as of 1.8.96, 111.982 /983 ENGINES 111.951 /955 up to model year 2008/AEJ 07 ENGINES 111.945 in model 208. as of 1.6.98, 202.020 /080 as of 1.9.98 ENGINES 111.974

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กลุ่มฟังก์ชัน 1 Engine › 07 Mixture formation › 07.61 ME fuel injection/ ignition system — ซีรีส์ 202 (รุ่น 020, 080) · ซีรีส์ 208 (รุ่น 335, 435)

ใช้กับเครื่องยนต์/เกียร์ด้วย: 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-4022F

ME-SFI lambda control, function

9.1.09

ENGINES 104.941 /943 /944 /991 /994 as of /96

ENGINES 104.995
with CODE (494) USA version
with CODE (807) model year 1997
with CODE (808) model year 1998
with CODE (498) as of model year 1997 Japan 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 /952 /956 /957 /958 /973, 111.975 as of 1.8.96, 111.982 /983

ENGINES 111.951 /955 up to model year 2008/AEJ 07

ENGINES 111.945
in model 208. as of 1.6.98,
202.020 /080 as of 1.9.98

ENGINES 111.974
with CODE (494) USA version
with CODE (807) model year 1997
with CODE (808) model year 1998

ENGINES 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /947 /949 /953 /954 /955 /970 /972 /975

ENGINES 112.946 /973 up to model year 2008/AEJ 07

ENGINES 113.940 /941 /942 /943 /948 /960 /961 /965 /966 /967 /968 /969

ENGINES 113.963 up to model year 2008/AEJ 07

ENGINES 119.980 /981 /982 /985

ENGINES 120.982/ 983

ENGINES 137.970

ME-SFI lambda control, function

P07.61-0396-06

Shown on engine 119

158 Three-way catalytic converter

B2/5 Hot film mass air flow sensor

B11/4 Coolant temperature sensor

B37 Accelerator pedal sensor

G3/3 Left O2 sensor upstream of catalytic converter

G3/4 Right O2 sensor upstream of catalytic converter

N3/10 ME-SFI [ME] control unit

Y62 Fuel injection valves

The mixture composition is maintained within the narrowest possible limits around λ = 1 in order to achieve a high conversion of the exhaust gases in the catalytic converter.

The O2 sensor reacts to the oxygen concentration in the exhaust and transmits the corresponding voltage signal to the ME-SFI [ME] control unit for fuel injection, which thereupon alters the mixture composition in such a way as to produce a mixture composition of λ = 1 in all operating states when the lambda closed-loop control is active. This procedure is constantly repeated (control loop), with the cycle rate depending on engine load and speed. The ME-SFI [ME] control unit alters the mixture composition with a time delay in order to prevent any risk of jerking.

The lambda closed-loop control is operational in the following operating conditions (closed-loop control):

- Coolant temperature > 52° C

- O2 sensors have reached operating temperature

- Idle speed/partial load

- Deceleration fuel shutoff inactive.

ME-SFI lambda control, function

ME-SFI [ME] control unit: fuel,
air mixture "ENRICH"

P49.10-0306-01

Injection time extended

Air/fuel mixture

mixture

Oxygen concentration in exhaust

Small

ME-SFI [ME] control unit: air/

fuel mixture

"ENLEAN"

O2 sensor voltage,

voltage jump

at λ = 1

O2 sensor voltage rises

Oxygen concentration in exhaust
high

Air/fuel mixture

"LEAN"

Injection time reduced

O2 sensor voltage drops

O2 sensor voltage,

voltage jump

at λ = 1

A Exhaust conversion rate

B Control range around
λ = 1 (catalytic converter window)

Example:

Assuming a leaner air/fuel mixture is produced. The consequence of this is that the
O2 sensor voltage tends to move in the direction of 0.1 V and the ME-SFI [ME] control unit compensates for this lean drift by enriching the mixture accordingly.

This makes it possible to achieve an air/fuel composition of approximately λ = 1. The readout of the lambda control factor on the HHT alters in the direction +25%. The more the lambda control factor moves in the direction +25%, the leaner is the fuel-air mixture and the greater is the enrichment of the mixture on the part of the ME-SFI [ME] control unit.

- 25% 0 + 25%

Lambda control factor (HHT/STAR DIAGNOSIS)

Reaction of ME-SFI [ME] control unit

O2 sensor voltage

Air/fuel mixture

"RICH" tendency "LEAN"

approx. 0.9 V tendency approx. 0.1 V

"ENLEAN" tendency "ENRICH"

Engine 112.946 with code 929 Flexible Fuel Vehicle (FFV)

After each fueling the Ethanol portion is determined by means of the O2sensor voltage upstream catalytic converter in the fuel tank. If for example Ethanol was refueled, the mixture is at first too lean (oxygen sensor voltage jumps back to 0 Volt). The lambda control reacts if the mixture to be enriched until after fuelingλ =1 is achieved again.

ME-SFI [ME] 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

O2 sensor heater, function

GF07.61-P-3025F

Coolant temperature sensor, location/task/design/function

Engine 119, 120

GF07.04-P-5026F

Engines 104, 111

GF07.04-P-5026G

Engine 112, 113, 137

GF07.04-P-5026A

Self-adjustment of mixture formation, function

GF07.10-P-1029F

Hot film mass air flow sensor, location/task/design/function

Engine 119, 120

(round connector)

GF07.07-P-4118E

Engines 104, 112, 113, 137

Engine 111 (except engine 111 EVO)

GF07.07-P-4118G

Engine 111 EVO

GF07.07-P-4118GS

Pedal value sensor, location/task/design/function

GF30.20-P-4011L

Fuel injection valve, location/task/design/function

GF07.03-P-5004F

ME-SFI two-sensor control, function

Engine 104, 111, 112, 113, 119, 120, 137 with EURO3/4 (code 925/926 or as standard) and

GF07.61-P-3020F

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

GF49.10-P-3002F

ME-SFI Flexible Fuel Vehicle (FFV), function

Code 929 Flexible Fuel Vehicle (FFV), engine 112.946

GF07.61-P-3021P

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