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This commit is contained in:
rusEfi 2015-02-11 11:04:31 -06:00
parent 765c1052f4
commit e5147549c6
1 changed files with 13 additions and 3 deletions
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16
firmware/controllers/math/speed_density.cpp
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@ -53,11 +53,21 @@ float sdMath(engine_configuration_s *engineConfiguration, float VE, float MAP, f
return 0;
}
// todo: pre-calculate gramm/second injector flow to save one multiplication
/**
* todo: pre-calculate gramm/second injector flow to save one multiplication
* open question if that's needed since that's just a multiplication
*/
float injectorFlowRate = cc_minute_to_gramm_second(engineConfiguration->injector.flow);
// todo: pre-calculate cylinder displacement to save one division
float Vol = engineConfiguration->specs.displacement / engineConfiguration->specs.cylindersCount;
return (Vol * VE * MAP) / (AFR * injectorFlowRate * GAS_R * tempK);
float cylinderDisplacement = engineConfiguration->specs.displacement / engineConfiguration->specs.cylindersCount;
float airMass = (cylinderDisplacement * VE * MAP) / (GAS_R * tempK);
/**
* injection_pulse_duration = fuel_mass / injector_flow
* fuel_mass = air_mass / target_afr
*
* injection_pulse_duration = (air_mass / target_afr) / injector_flow
*/
return airMass / (AFR * injectorFlowRate);
}
/**