egr_calc
Purpose:
-
Calculate EGR.
Enter:
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egr_calc <priority> <filename> [+c] &
Where:
-
priority
Specify the task priority.
filename
Specify the pathname of the specification file for the egr calculations.
+c
Optional. Specify this flag to register this task as critical with the master scheduler. A SLO rate is assumed as the interface period to the master scheduler.
Example:
-
egr_calc 13 /specs/egr_specs.115 +c &
The above spawns the task egr_calc with a priority of 13 and the file /specs/egr_specs.115 contains the specifications for the egr calculations. The task is registered as critical with the master scheduler.
Notes:
-
This task is normally started in the go script as part of CyFlex startup process.
For more information see Cummins intranet url:
/asset.ctc.cummins.com/asset/tte/gas_comp_prop/exh_gas_recirc.pdf
/asset.ctc.cummins.com/asset/tte/gas_comp_prop/egr_calc_tbl.pdfThe following is an example spec file for the egr calculations.
@REG_NAME
egr_calc
@COMPUTE_EVENT
# start event name or done event name
# continuous intrvl name
SLO egr_calc_done
@FRESH_EGR_COMPOSITION_STREAM
# fresh stream label egr stream label
inlet_airC. burned_gasC.
# Measured concentrations for the charge stream.
# Entry may be a label or a value.
@CHARGE_MEASURED_CONC
# CO2 lbl CO lbl NOX lbl O2 lbl HC lbl
co2_chrg_ppm $-$ $-$ 196000[ppm] 20.[ppm]
# the following is an optional entry
@EGR_MEASURED_CONC
# CO2 lbl CO lbl NOX lbl O2 lbl HC lbl
co2_ppm $-$ $-$ $-$ 200.0[ppm]
# the following is an optional entry
@FRESH_MEASURED_CONC
# CO2 lbl CO lbl NOX lbl O2 lbl HC lbl
$-$ $-$ $-$ $-$ 0.0[ppm]
@EGR_FIRST_LAW
# charge temperature egr temperature fresh temperature
int_mnf_t egrclr_ot_t ac_air_ot_t
# the ‘selected component is the concentration
# component that will be used as the basis of
# the calculations. Valid components are
# O2, C2, HC, NX, CO, and FL
@EGR_CALCULATIONS
# Selected Component %egr lbl conc_o2_chrg label
O2 pct_egr_o2 egr_mix_o2C.
C2 pct_egr_c2 egr_mix_c2C.
HC pct_egr_hc egr_mix_hcC.
$ # terminating character for @EGR_CALCULATIONS keyword