{"id":3641,"date":"2019-02-12T16:09:32","date_gmt":"2019-02-12T16:09:32","guid":{"rendered":"https:\/\/cyflexdoc.wpengine.com\/usage-help-manual\/12-fluid-flow-computations\/fa_total\/"},"modified":"2025-09-24T13:02:23","modified_gmt":"2025-09-24T18:02:23","slug":"fa_total","status":"publish","type":"page","link":"https:\/\/cyflex.com\/index.php\/usage-help-manual\/19-fluid-flow-computations\/fa_total\/","title":{"rendered":"fa_total"},"content":{"rendered":"
\n

Purpose:<\/h3>\n<\/div>\n
\n
\n

Perform continuous fuel and air flow totalizing computations for engine performance, including summing rates and calculating metrics like air-fuel ratio.<\/p>\n<\/dd>\n<\/dl>\n

Enter:<\/h3>\n
\n
\n

fa_total<\/strong> <priority> <interval> <filename> [+c]<\/p>\n<\/dd>\n<\/dl>\n

Where:<\/h3>\n
\n
\n\n\n\n<\/colgroup>\n\n\n\n\n\n
\n

priority<\/p>\n<\/td>\n

\n

Specify the system task priority as an integer.<\/p>\n<\/td>\n<\/tr>\n

\n

interval<\/p>\n<\/td>\n

\n

Specify the process interval in milliseconds, such as FAS, MED, or SLO.<\/p>\n<\/td>\n<\/tr>\n

\n

filename<\/p>\n<\/td>\n

\n

Specify the path to the specification file.<\/p>\n<\/td>\n<\/tr>\n

\n

+c<\/p>\n<\/td>\n

\n

Optional. Specify this flag to indicate a critical task to the watchdog.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/dd>\n<\/dl>\n

Example:<\/h3>\n
\n
\n

fa_total<\/strong> 8 1000 \/specs\/fa_specs.315 +c &
\nThe above command spawns ‘fa_total’ in the background at a priority of 8.
\nThe computations are performed once every second using the specifications
\nin the file \/specs\/fa_specs.315. The task is also assigned to be a critical
\ntask. As a result, if the task ever stops responding to the watchdog, any
\ntest that is running will be aborted.\u00a0 The fa_total task will register its
\nname with the filename (not the full pathame), in this case
\n“fa_specs.315”.\u00a0 This name can be used by the ‘re-read’ command to request
\nthat it updates the specifications by reading the specification file again.\u00a0
\nThis feature allows the specifications to be changed “on-the-fly” without
\nslaying and restarting the app. Note: re-read feature is not available
\nprior to 6.3.30 or 6.4.0.<\/p>\n<\/dd>\n<\/dl>\n

Notes:<\/h3>\n

This task is normally started in the go script that starts CyFlex.<\/p>\n

fa_total is not a mass flow measurement application such as “lc_scales”,
\n“cf_scales”, or “scales”. The primary purpose of fa_total is to
\ncontinuously sum one or more fuel flow values with one or more air flow
\nvalues and calculate the following:
\nTotal fuel rate (Fuel_rate)
\nAir-fuel equivalence ratio (lambda)
\nTotal dry mass air flow rate (air_mtr0_mfd)
\nTotal wet mass air flow rate (air_mtr0_mf)
\nFuel-air equivalence ratio (phi)
\nAir-fuel ratio (AF_ratio)<\/p>\n

All of the above variables are specified in perf_labels and will be updated
\nby fa_total at the rate specified when it is spawned. You cannot configure
\nwhich variables fa_total updates, it will always update the variables created
\nby perf_labels.<\/p>\n

In order to calculate these values, the following variables are needed as inputs
\nto the program:
\nPower generated (Dyno_power)
\nFuel mass flow variable(s)
\nDry air mass flow variable(s)
\nWet air mass flow variable(s)<\/p>\n

The variable used for Dyno_power is specified in perf_labels. The fuel and air
\nmass flow variables are specified in the fa_specs spec file.<\/p>\n

fa_total will also update the following variables during a fuel reading. These
\nvariables are created by sys_start and specified in \/cell\/logi_specs:
\nFR_in_prg
\nFR_request
\nFR_runtime<\/p>\n

The most common use for fa_total is when using a continuous fuel flow measurement
\ndevice such as a Flotron, Coriolis meter, or a positive displacement meter of some kind.<\/p>\n

Use fa_total<\/strong> for a continuous fuel flow measurement device such as a Flotron or Coriolis meter, or a positive displacement meter of some kind.<\/p>\n

See Also:<\/h3>\n
\n
\n

Fuel Air Total Computation<\/a>, re-read<\/a><\/p>\n<\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"

Purpose: Perform continuous fuel and air flow totalizing computations for engine performance, including summing rates and calculating metrics like air-fuel ratio. Enter: fa_total <priority> <interval> <filename> [+c] Where: priority Specify the system task priority as an integer. interval Specify the process interval in milliseconds, such as FAS, MED, or SLO. filename Specify the path to […]<\/p>\n","protected":false},"author":47,"featured_media":0,"parent":1959,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3641","page","type-page","status-publish","hentry"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/3641","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/users\/47"}],"replies":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/comments?post=3641"}],"version-history":[{"count":0,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/3641\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/1959"}],"wp:attachment":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/media?parent=3641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}