Load: Difference between revisions

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;Engine load: Also known as relative cylinder charge. It represents the percentage of air (compared to standard density) in each of the cylinders. 100% load means each cylinder has the mass of air as an equivalent volume at standeard pressure. Load is calculated from [[MAF]] value divided by RPM. It is used in real time to control all other values including boost and fueling.
;Engine load: Also known as relative cylinder charge. It represents the percentage of air (compared to standard density) in each of the cylinders. 100% load means each cylinder has the mass of air as an equivalent volume at standard density. Load is calculated from [[MAF]] value (mass/time) divided by RPM (1/time) to yield a mass. Standard mass is calculated by engine displacement (volume) divided by standard density (mass/volume). The ratio of the two is load. It is used in real time to control all other values including boost and fueling.


;Engine load specified: The maximum target load based on programmed values; generally depends only on RPM.
;Engine load specified: The maximum target load based on programmed values; generally depends only on RPM.


;Engine load corrected specified: Adjusted maximum target load based upon a number of internal and external values, two externals being ambient temerature and pressure. Internals are usually due to engine wear trims.
;Engine load corrected specified: Adjusted maximum target load based upon a number of internal and external values, two externals being ambient temperature and pressure. Internals are usually due to engine wear trims.


;Requested load: Target load based on the accelerator pedal position. It is capped by engine load corrected specified and will never exceed that value.
;Requested load: Target load based on the accelerator pedal position. It is capped by engine load corrected specified and will never exceed that value.

Revision as of 17:55, 21 January 2008

Engine load
Also known as relative cylinder charge. It represents the percentage of air (compared to standard density) in each of the cylinders. 100% load means each cylinder has the mass of air as an equivalent volume at standard density. Load is calculated from MAF value (mass/time) divided by RPM (1/time) to yield a mass. Standard mass is calculated by engine displacement (volume) divided by standard density (mass/volume). The ratio of the two is load. It is used in real time to control all other values including boost and fueling.
Engine load specified
The maximum target load based on programmed values; generally depends only on RPM.
Engine load corrected specified
Adjusted maximum target load based upon a number of internal and external values, two externals being ambient temperature and pressure. Internals are usually due to engine wear trims.
Requested load
Target load based on the accelerator pedal position. It is capped by engine load corrected specified and will never exceed that value.