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Pressure Compensation Equation for AFR
AFR(corrected) = (AFR(measured) + B x P) / (1 + C x P)
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)
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
%O
(corrected) = %O
2
where: %O
(corrected) = the %O
2
%O
(measured) = the %O
2
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
2
(measured) / [1.0 + B x P]
2
corrected for exhaust pressure.
2
output by the AFM.
2
[Equation 3a]
[Equation 3b]
[Equation 3c]
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