34 lines
1.4 KiB
C++
34 lines
1.4 KiB
C++
#pragma once
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#include "FluidSim/Crankcase.hpp"
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namespace fluidsim::port {
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// Two-stroke variant of the reciprocating cylinder model. The shared four-
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// stroke implementation supplies geometry, state balance, and combustion
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// parameters; cycle events and pumping torque are specialized here.
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class TwoStrokeCylinder final : public EngineCylinder {
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public:
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TwoStrokeCylinder(float bore, float stroke, float connecting_rod_length,
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float compression_ratio, float transfer_duration_degrees,
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float exhaust_duration_degrees);
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float transfer_open() const { return 180.0f - transfer_duration_ * 0.5f; }
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float transfer_close() const { return 180.0f + transfer_duration_ * 0.5f; }
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float exhaust_open() const { return 180.0f - exhaust_duration_ * 0.5f; }
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float exhaust_close() const { return 180.0f + exhaust_duration_ * 0.5f; }
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void set_crankcase(Crankcase& crankcase) { crankcase_ = &crankcase; }
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float valve_area(float cycle_degrees, bool inlet) const override;
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void pre_step(Crankshaft& crank, float dt, float throttle) override;
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private:
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float transfer_duration_{}, exhaust_duration_{};
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Crankcase* crankcase_{};
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static float lift(float angle, float opens, float closes, float peak_lift);
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void handle_cycle_events(float previous_degrees, float current_degrees);
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};
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} // namespace fluidsim::port
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