52 lines
2.4 KiB
C++
52 lines
2.4 KiB
C++
#include "FluidSim/Scenario.hpp"
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#include <cmath>
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#include <iostream>
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#include <stdexcept>
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using namespace fluidsim::port;
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namespace {
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void check(bool condition, const char *message) {
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if (!condition)
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throw std::runtime_error(message);
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}
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void run(FourStrokeTwinScenario &s, float seconds, float pedal) {
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s.throttle = pedal;
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for (int i = 0; i < int(std::lround(seconds * 44100)); ++i) {
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const auto audio = s.process();
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check(std::isfinite(audio.left) && std::isfinite(audio.right), "nonfinite transient audio");
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}
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}
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} // namespace
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int main() {
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FourStrokeTwinScenario s;
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run(s, 3, 0);
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run(s, .5f, .8f);
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run(s, 4.5f, 0);
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const float idle_map = s.intake_plenum.pressure();
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check(idle_map > 20000 && idle_map < 80000, "idle MAP did not recover after first blip");
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run(s, 1, 1);
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const float open_map = s.intake_plenum.pressure();
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const float open_temperature = s.intake_plenum.temperature();
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const auto inlet = s.pipes.front().state(0);
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const float inlet_temperature = inlet.pressure / (inlet.rho * gas_constant);
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check(open_map > 75000 && open_map > idle_map + 20000,
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"opening throttle did not relieve manifold vacuum");
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check(open_temperature > 250 && open_temperature < 400,
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"fresh charge heats progressively after repeated blips");
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check(inlet_temperature > 280 && inlet_temperature < 320,
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"inlet no longer supplies near-ambient fresh air");
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check(std::abs(s.intake_atmosphere.port.temperature - 300) < .01f, "reservoir temperature drift");
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check(std::abs(s.intake_atmosphere.port.air_fraction - 1) < 1e-6, "reservoir admits exhaust composition");
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run(s, 7, 0);
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const auto recovered = s.snapshot();
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check(recovered.rpm > 1000 && recovered.rpm < 2600, "engine did not recover idle after second blip");
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check(recovered.intake_pressure > 20000 && recovered.intake_pressure < 80000,
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"manifold remains evacuated after idle recovery");
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for (const auto &p : s.pipes)
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check(p.positivity_repairs == 0, "intake transient required positivity repairs");
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std::cout << "Intake regression passed: idle_MAP=" << idle_map / 1000
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<< " kPa, open_MAP=" << open_map / 1000 << " kPa, open_T=" << open_temperature
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<< " K, inlet_T=" << inlet_temperature
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<< " K, recovered_MAP=" << recovered.intake_pressure / 1000
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<< " kPa, recovered_RPM=" << recovered.rpm << '\n';
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}
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