Woodward GECO, Техническое руководство, Страница: 50 / 90

GECO

Stoichiometric Manual 03554
42 Woodward
Screen 3 Oxygen Sensors
EGO unfiltered
: Oxygen sensor signals before filtering.
EGO filter
: Oxygen sensor signals after filtering.
EGO target
: Target values for CL and adaptive.
EGO health
: Remaining “life” of sensor.
Adaptive
: Adaptive control shift for EGO3 (Cat-Out).
Valve Command
: Valve opening command.
Valve Cur
: Actual valve control current
Screen 3: Calibration
ControlType
: SS-STOICH/steady-
state SW-STOICH/switching-mode.
ClsdLoop Gain
: Control response
to EGO1/2 errors.
Adaptive Gain
: Control response to
EGO3 errors.
Switch Time
: Cycle time for
switching-mode.
Base Phi
: Base point (0% adaptive)
for switch-mode.
Excursion min
: Switching-mode
excursion limit.
Excursion max
: Switching-mode
excursion limit.
EGO1 Base
: Voltage corresponding
to Base Phi.
EGO2 Base
: Voltage corresponding
to Base Phi.
EGO 1/2 Filter Tau
: EGO sensors 1 & 2 filter time constant.
EGO 3/4 Filter Tau
: EGO sensors 3 & 4 filter time constant.
Valve1 Excursion
: Valve excursion in switching-mode.
Valve2 Excursion
: Valve excursion in switching-mode.
Tech Tip: Base Phi centers the adaptive slightly rich for effective
catalysis. If adaptive limit alarms are consistently being set always
high or low, EGO Base should be shifted to center the adaptive zero
point.
Calibration
ControlType SW-STOICH
ClsdLoop Gain 20 %
Adaptive Gain 10 %
Switch Time 700 ms
Base Phi 1.010
Excursion min 0.03 %
Excursion max 0.15 %
EGO1 Base 0.600 volts
EGO2 Base 0.600 volts
EGO1/2 filter tau 61 ms
EGO3/4 filter tau 76 ms
Valve1 Excur 0.04 %
l 2 0 05 %
Engine-Out Cat-Out
Bank1 Bank2 Bank1+2 (EGO3)
EGO unfilt 0.642 0.656 0.675 volts
EGO filter 0.618 0.661 0.698 volts
EGO target 0.600 0.600 0.712 volts
EGO health 34 97 90%
Adaptive +2.10%
Valve Cmd +33.00 +65.00%
Valve Cur 0.41 0.59 amps