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20 lines
575 B
C++
20 lines
575 B
C++
#include "lambda_conversion.h"
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#include "sampling.h"
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static float GetPhi(float pumpCurrent)
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{
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// This estimation is accurate within 0.5% from 0.8 to 1.0, and 0.01% from 1 to 1.2 lambda when compared to the lookup table in the Bosch datasheet
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// This error is less than half of the claimed accuracy of the sensor itself
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float gain = pumpCurrent < 0 ? -0.28299f : -0.44817f;
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return gain * pumpCurrent + 0.99559f;
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}
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float GetLambda()
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{
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float pumpCurrent = GetPumpNominalCurrent();
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// Lambda is reciprocal of phi
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return 1 / GetPhi(pumpCurrent);
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}
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