o2 update

a98e5b94 · Karol Hennessy · 5179e313 · a98e5b94
Commit a98e5b94 authored Nov 02, 2020 by Karol Hennessy
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BreathingLoop.cpp arduino/hev_prototype_v1/src/BreathingLoop.cpp +3 -0

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--- a/arduino/hev_prototype_v1/src/BreathingLoop.cpp
+++ b/arduino/hev_prototype_v1/src/BreathingLoop.cpp
@@ -1290,6 +1290,9 @@ void BreathingLoop::doO2ValveFrac(float desired_fiO2, float pressure_change)
    // we calculate amount of o2 : air to input
    // if we have to fill 300 mbar, we fill up to (o2_frac * 300) mbar of o2, then (1-o2_frac)*300 mbar air

+    // we estimate the current o2 fraction, rather than wait for o2 sensor
+    // we should have an alarm if o2 sensor and o2 expectation is wrong after 1 min
+
    float o2change = (desired_fiO2*(1000+pressure_change) - _expected_fiO2 *1000 -0.21*pressure_change)/(0.79*pressure_change);
    if (o2change > 1){
        o2change = 1;