GCC Code Coverage Report

Directory: ./
File: firmware/controllers/math/speed_density.cpp
Date: 2025-10-24 14:26:41
Coverage Exec Excl Total
Lines: 68.9% 31 0 45
Functions: 100.0% 3 0 3
Branches: 44.4% 16 0 36
Decisions: 50.0% 8 - 16
Line Branch Decision Exec Source
1 /**
2 * @file speed_density.cpp
3 *
4 * See http://rusefi.com/wiki/index.php?title=Manual:Software:Fuel_Control#Speed_Density for details
5 *
6 * @date May 29, 2014
7 * @author Andrey Belomutskiy, (c) 2012-2020
8 */
9
10 #include "pch.h"
11
12 #if defined(HAS_OS_ACCESS)
13 #error "Unexpected OS ACCESS HERE"
14 #endif
15
16 #define rpmMin 500
17 #define rpmMax 8000
18
19 ve_Map3D_t veMap{"ve"};
20
21 #define tpMin 0
22 #define tpMax 100
23
24 1107 float IFuelComputer::getTChargeCoefficient(float rpm, float tps) {
25 // First, do TPS mode since it doesn't need any of the airflow math.
26
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 1107 if (engineConfiguration->tChargeMode == TCHARGE_MODE_RPM_TPS) {
27 1106 float minRpmKcurrentTPS = interpolateMsg("minRpm", tpMin,
28 1106 engineConfiguration->tChargeMinRpmMinTps, tpMax,
29 1106 engineConfiguration->tChargeMinRpmMaxTps, tps);
30 1106 float maxRpmKcurrentTPS = interpolateMsg("maxRpm", tpMin,
31 1106 engineConfiguration->tChargeMaxRpmMinTps, tpMax,
32 1106 engineConfiguration->tChargeMaxRpmMaxTps, tps);
33
34 1106 return interpolateMsg("Kcurr", rpmMin, minRpmKcurrentTPS, rpmMax, maxRpmKcurrentTPS, rpm);
35 }
36
37 1 constexpr floatms_t gramsPerMsToKgPerHour = (3600.0f * 1000.0f) / 1000.0f;
38 // We're actually using an 'old' airMass calculated for the previous cycle, but it's ok, we're not having any self-excitaton issues
39 1 floatms_t airMassForEngine = sdAirMassInOneCylinder * engineConfiguration->cylindersCount;
40 // airMass is in grams per 1 cycle for 1 cyl. Convert it to airFlow in kg/h for the engine.
41 // And if the engine is stopped (0 rpm), then airFlow is also zero (avoiding NaN division)
42
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 1 floatms_t airFlow = (rpm == 0) ? 0 : airMassForEngine * gramsPerMsToKgPerHour / getEngineCycleDuration(rpm);
43
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 1 if (engineConfiguration->tChargeMode == TCHARGE_MODE_AIR_INTERP) {
45 // just interpolate between user-specified min and max coefs, based on the max airFlow value
46 1 return interpolateClamped(
47 0.0, engineConfiguration->tChargeAirCoefMin,
48 engineConfiguration->tChargeAirFlowMax, engineConfiguration->tChargeAirCoefMax,
49 airFlow
50 1 );
51 ✗ } else if (engineConfiguration->tChargeMode == TCHARGE_MODE_AIR_INTERP_TABLE) {
52 ✗ return interpolate2d(
53 airFlow,
54 ✗ engineConfiguration->tchargeBins,
55 ✗ engineConfiguration->tchargeValues
56 ✗ );
57 } else {
58 ✗ criticalError("Unexpected tChargeMode: %d", engineConfiguration->tChargeMode);
59 ✗ return 0;
60 }
61 }
62
63 // http://rusefi.com/math/t_charge.html
64 /***panel:Charge Temperature*/
65 1107 temperature_t IFuelComputer::getTCharge(float rpm, float tps) {
66
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 1107 const auto clt = Sensor::get(SensorType::Clt);
67
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 1107 const auto iat = Sensor::get(SensorType::Iat);
68
69 float airTemp;
70
71 // Without either valid, return 0C. It's wrong, but it'll pretend to be nice and dense, so at least you won't go lean.
72
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 1107 if (!iat && !clt) {
73 ✗ return 0;
74
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 1107 } else if (!clt && iat) {
75 // Intake temperature will almost always be colder (richer) than CLT - use that
76 ✗ return iat.Value;
77
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 1107 } else if (!iat && clt) {
78 // Without valid intake temperature, assume intake temp is 0C, and interpolate anyway
79 ✗ airTemp = 0;
80 } else {
81 // All is well - use real air temp
82 1107 airTemp = iat.Value;
83 }
84
85 1107 float coolantTemp = clt.Value;
86
87
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 1107 sdTcharge_coff = getTChargeCoefficient(rpm, tps);
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 1107 if (std::isnan(sdTcharge_coff)) {
90 ✗ warning(ObdCode::CUSTOM_ERR_T2_CHARGE, "t2-getTCharge NaN");
91 ✗ return coolantTemp;
92 }
93
94 // Interpolate between CLT and IAT:
95 // 0.0 coefficient -> use CLT (full heat transfer)
96 // 1.0 coefficient -> use IAT (no heat transfer)
97
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 1107 float Tcharge = interpolateClamped(0.0f, coolantTemp, 1.0f, airTemp, sdTcharge_coff);
98
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 1107 if (std::isnan(Tcharge)) {
100 // we can probably end up here while resetting engine state - interpolation would fail
101 ✗ warning(ObdCode::CUSTOM_ERR_TCHARGE_NOT_READY, "getTCharge NaN");
102 ✗ return coolantTemp;
103 }
104
105 1107 return Tcharge;
106 }
107
108 586 void initSpeedDensity() {
109 586 veMap.initTable(config->veTable, config->veRpmBins, config->veLoadBins);
110 586 }
111