Подскажите, очень интересует вопрос, PIDы для Мазды по лоаду считаются примерно (или точно) по алгоритму, процитированному ниже
Снимаю логи при самонастройке ЭБУ (настройка как раз по лоаду), но некоторое сомнение присутствует.
Или PID показывается напрямую из ЭБУ, без расчетов в программе?
Спасибо.
Calculated LOAD Value (PID 04)
The calculated load value LOAD_PCT is a percentage of peak available torque (current airflow / peak airflow @sea level) * (BARO @ sea level / BARO) * 100%
LOAD_PCT = [current airflow] / [(peak airflow at WOTstp as a function of rpm) * (BARO/29.92) * SQRT (298 / (AAT+273))]
--- STP = Standard Temperature and Pressure = 25 °C, 29.92 in Hg BARO,
--- SQRT = square root
--- WOT = wide open throttle
--- AAT = Ambient Air Temperature in °C
Characteristics of LOAD_PCT are:
— Reads 1.0 at WOT at any altitude, temp or rpm for both NA and boosted engines.
— Indicates percent of peak available torque.
— Linearly correlated with engine vacuum
— Often used to schedule power enrichment.
— Compression ignition engines shall support this PID using fuel flow in place of airflow.
Absolute Load Value (PID 43)
The absolute load value LOAD_ABS is the normalized value of air mass per intake stroke displayed as a percent.
LOAD_ABS = [air mass (g / intake stroke)] / [1.184 (g / intake stroke) * cylinder displacement in liters]
Where:
--- air mass (g / intake stroke) = [total engine air mass (g/sec)] / [rpm (revs/min)* (1 min
/ 60 sec) * (1/2 # of cylinders (strokes / rev)]
--- [1.184 (g / intake stroke) * cylinder displacement in liters] = [maximum air mass
(g)/intake stroke at WOTstp at 100% volumetric efficiency] * 100%.
--- (maximum air mass (g)/intake stroke at WOTstp at 100% volumetric efficiency) = a
constant for a given cylinder swept volume.
--- The constant is 1.184 (g/liter 3) * cylinder displacement (liter 3/intake stroke) based on
air density at STP.
--- STP = Standard Temperature and Pressure = 25 °C, 29.92 in Hg (101.3 kPa) BARO.
--- WOT = wide open throttle.
Characteristics of LOAD_ABS are:
— Ranges from 0 to approximately 0.95 for NA engines, 0 – 4 for boosted engines.
— Linearly correlated with engine indicated and brake torque.
— Often used to schedule spark and EGR rates.
— Peak value of LOAD_ABS correlates with volumetric efficiency at WOT.
— Indicates the pumping efficiency of the engine for diagnostic purposes.
Spark ignition engine are required to support PID $43. Compression ignition (diesel) engines are not required to support this PID.