Pressure Compensation Equation for AFR
AFR(corrected) = (AFR(measured) + B x P) / (1 + C x P)
[Equation 3a]
where: AFR(corrected) = the AFR corrected for exhaust pressure.
AFR(measured) = the AFR output by the AFM.
B = 0.00398 (LSU 4.2), 0.00395 (LSU 4.9), 0.009140 (NTK) rich
B = 0.00471 (LSU 4.2), 0.00453 (LSU 4.9), 0.012100 (NTK) lean
C = 0.000273 (LSU 4.2), 0.000271 (LSU 4.9), 0.000627 (NTK) rich
C = 0.000323 (LSU 4.2), 0.000311 (LSU 4.9), 0.000830 (NTK) lean
P = the exhaust pressure in mmHg above the pressure at which
the sensor was calibrated (using the CAL POT on the
AFM while the sensor is held in air). Equation 3a is valid
for -150 mmHg < P < 300 mmHg.
Pressure Compensation Equation for Lambda
Lambda(corrected) = (Lambda(measured) + B x P) / (1 + B x P)
[Equation 3b]
where: Lambda(corrected) = the Lambda corrected for exhaust pressure.
Lambda(measured) = the Lambda output by the AFM.
B = 0.000273 (LSU 4.2), 0.000271 (LSU 4.9), 0.000627 (NTK) rich
B = 0.000323 (LSU 4.2), 0.000311 (LSU 4.9), 0.000830 (NTK) lean
P = the exhaust pressure in mmHg above the pressure at which
the sensor was calibrated (using the CAL POT on the
AFM while the sensor is held in air). Equation 3b is valid
for -150 mmHg < P < 300 mmHg.
Pressure Compensation Equation for %O
2
%
O
2
(corrected) = %O
2
(measured) / [1.0 + B x P]
[Equation
3c]
where: %O
2
(corrected) = the %O
2
corrected for exhaust pressure.
%O
2
(measured) = the %O
2
output by the AFM.
B = 0.000323 (LSU 4.2), 0.000311 (LSU 4.9), 0.000830
(NTK)
P = the exhaust pressure in mmHg above the pressure at which
the sensor was calibrated (using the CAL POT on the
AFM while the sensor is held in air). Equation 3c is valid
for -150 mmHg < P < 300 mmHg.
10
Summary of Contents for AFM1040
Page 1: ...AFM1040 AFM1540 Air Fuel Ratio Combustion Monitor Instruction Manual 02 06 Part Number 1040A 6...
Page 4: ...Supplementary Information 17 ii...
Page 20: ...16...
Page 21: ...17...
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Page 23: ...19...
Page 24: ...20...
Page 25: ...State Diagram for SMB Communication 21...
Page 26: ...22...
Page 29: ......
Page 30: ...Los Altos CA 94023 0040 USA 408 734 3433 Fax 408 734 3432 www ecm co com...