rusefi-1/unit_tests/tests/sensor/test_vehicle_speed_converter.cpp

#include "pch.h"
#include "vehicle_speed_converter.h"


float GetVssFor(float revPerKm, float axle, float teeth, float hz) {
	EngineTestHelper eth(TEST_ENGINE);

	VehicleSpeedConverter dut;

	engineConfiguration->driveWheelRevPerKm = revPerKm;
	engineConfiguration->vssGearRatio = axle;
	engineConfiguration->vssToothCount = teeth;

	return dut.convert(hz).value_or(-1);
}

TEST(VehicleSpeed, FakeCases) {
	// 0hz -> 0kph
	EXPECT_NEAR_M3(0, GetVssFor(500, 5, 10, 0));

	// 1000hz -> 144 kph
	EXPECT_NEAR_M3(144, GetVssFor(500, 5, 10, 1000));

	// Half size tires -> half speed
	EXPECT_NEAR_M3(72, GetVssFor(1000, 5, 10, 1000));

	// Double the axle ratio -> half the speed
	EXPECT_NEAR_M3(72, GetVssFor(500, 10, 10, 1000));

	// Twice as many teeth -> half speed
	EXPECT_NEAR_M3(72, GetVssFor(500, 5, 20, 1000));
}

TEST(VehicleSpeed, RealCases) {
	// V8 Volvo
	// 205/50R16 tire -> 521 rev/km
	// 3.73 axle ratio
	// 17 tooth speedo gear
	EXPECT_NEAR_M3(108.970f, GetVssFor(521, 3.73, 17, 1000));

	// NB miata
	// 205/50R15 tire -> 544 rev/km
	// 4.3 axle ratio
	// 21 tooth speedo gear
	EXPECT_NEAR_M3(73.285f, GetVssFor(544, 4.3, 21, 1000));

	// Some truck with ABS sensors
	// 265/65R18 tire -> 391 rev/km
	// 1.0 ratio because ABS sensors are hub mounted
	// 48 tooth abs sensor
	EXPECT_NEAR_M3(191.816f, GetVssFor(391, 1, 48, 1000));
}