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explicitly test PTC thermistors (#2681) 

* test ptc

* allow hotter for air cooled people

Co-authored-by: Matthew Kennedy <makenne@microsoft.com>
This commit is contained in:
Matthew Kennedy 2021-05-10 15:15:09 -07:00 committed by GitHub
parent 370eb0d5a5
commit 9b0c7ff693
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2 changed files with 20 additions and 1 deletions
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2
firmware/controllers/sensors/converters/thermistor_func.cpp
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@ -27,7 +27,7 @@ SensorResult ThermistorFunc::convert(float ohms) const {
// bounds check result - please don't try to run rusEfi when colder than -50C
// high end limit is required as this could be an oil temp sensor
if (celsius < -50 || celsius > 200) {
if (celsius < -50 || celsius > 250) {
return unexpected;
}

19
unit_tests/tests/sensor/therm_func.cpp
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@ -34,3 +34,22 @@ TEST(thermistor, ThermistorNeon) {
assertEqualsM("B", 0.0003, tf.m_b);
ASSERT_NEAR(0.0, tf.m_c, EPS4D);
}
TEST(thermistor, PtcAirCooledMotorcycle) {
// data from https://static.chipdip.ru/lib/033/DOC001033132.pdf
thermistor_conf_s tc = {0, 100, 200, 486, 975, 1679, 0};
ThermistorFunc tf;
tf.configure(tc);
// calibrated points should be almost perfect
ASSERT_NEAR(tf.convert(486).value_or(0), 0, 0.1);
ASSERT_NEAR(tf.convert(975).value_or(0), 100, 0.1);
ASSERT_NEAR(tf.convert(1679).value_or(0), 200, 0.1);
// Other points should be pretty good
ASSERT_NEAR(tf.convert(414).value_or(0), -20, 2);
ASSERT_NEAR(tf.convert(704).value_or(0), 50, 2);
ASSERT_NEAR(tf.convert(1300).value_or(0), 150, 2);
ASSERT_NEAR(tf.convert(1846).value_or(0), 220, 2);
}