Download gear based high performance electronic boost controller user manual

CONTROL THEORY
The Cortex EBC adjusts boost by utilizing a 3-Port BCS (Boost Control Solenoid) to control the behavior of your
turbocharger’s wastegate. The signal applied to the 3-Port BCS by the Cortex EBC is defined by a duty cycle, which is
essentially the percentage of time the 3-Port BCS is activated. In general, increasing duty cycle will act to increase boost
above the wastegate spring pressure.

The Cortex EBC updates the 3-Port BCS duty cycle 16 times per second.

A complete activation/deactivation cycle of the 3-Port BCS is called a control period.

The duty cycle output to the 3-Port BCS during each control period is called End Duty Cycle.
Cortex EBC 3-Port BCS Drive Signal
The method used by the Cortex EBC to determine End Duty Cycle depends on boost pressure and the parameter settings
for the active Control Map profile. Based on these factors, the Cortex EBC will operate in the vacuum, spool, control, or
overboost state.
STATE
Vacuum
Spool
Control
Overboost
REQUIREMENTS
𝐵𝑜𝑜𝑠𝑡 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 ≤ 0.0 𝑃𝑆𝐼
0.0 𝑃𝑆𝐼 < 𝐵𝑜𝑜𝑠𝑡 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 ≤ 𝑆𝑝𝑟𝑖𝑛𝑔 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 𝐿𝑖𝑚𝑖𝑡
𝑆𝑝𝑟𝑖𝑛𝑔 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 𝐿𝑖𝑚𝑖𝑡 < 𝐵𝑜𝑜𝑠𝑡 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 < 𝐵𝑜𝑜𝑠𝑡 𝐿𝑖𝑚𝑖𝑡
𝐵𝑜𝑜𝑠𝑡 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 ≥ 𝐵𝑜𝑜𝑠𝑡 𝐿𝑖𝑚𝑖𝑡
Cortex EBC Operation States
Cortex EBC User Manual
END DUTY CYCLE
0.0%
𝑆𝑝𝑜𝑜𝑙 𝐷𝑢𝑡𝑦 𝐶𝑦𝑐𝑙𝑒 𝐿𝑖𝑚𝑖𝑡 𝑜𝑟 𝑆𝑡𝑎𝑟𝑡 𝐷𝑢𝑡𝑦 𝐶𝑦𝑐𝑙𝑒
𝑆𝑡𝑎𝑟𝑡 𝐷𝑢𝑡𝑦 𝐶𝑦𝑐𝑙𝑒 + 𝐶𝑜𝑛𝑡𝑟𝑜𝑙 𝐷𝑢𝑡𝑦 𝐶𝑦𝑐𝑙𝑒
0.0%
End Duty Cycle vs Boost Level
SIRHC Labs LLC - 2015
8