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 = 0.009140 for AFR < 14.57 (rich).
B = 0.012100 for AFR
≥
14.57 (lean).
C = 0.000627 for AFR < 14.57 (rich).
C = 0.000830 for AFR
≥
14.57 (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 -152 mmHg < P < 532 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 = 0.000627 for Lambda < 1.0 (rich).
B = 0.000830 for Lambda
≥
1.0 (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 -152 mmHg < P < 532 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 = 0.000830
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 -152 mmHg < P < 532 mmHg.
10
Summary of Contents for afm1000
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