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 |
;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. |
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;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. |
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;Engine load corrected specified: Adjusted maximum target load based upon a number of internal and external values, two externals being ambient |
;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. |
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;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. |
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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.