AIR FUEL RATIO (A/F) SENSOR HEATER CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]
AIR FUEL RATIO (A/F) SENSOR HEATER CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]
SM2565351
id0140u0785500
Outline
• Based on the control of the A/F sensor heater, a stabilized oxygen concentration is detected even at low exhaust temperatures, and feedback control of fuel injection even at cold engine start is made possible for improved cold temperature exhaust emission performance.
• Both emission performance and sensor protection have been improved by duty control of the heater according to engine operation conditions (exhaust gas temperature).
Block Diagram
am3zzn00008280
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Operation
Normal control
-
• The PCM operates the A/F sensor based on the following control conditions:
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Output duty ratio |
Control condition |
|---|---|
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0%
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• Ignition switched off
• Engine stopped (excludes engine stop by i-stop control)
• Engine start (cranking)
|
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0―100%
(Duty ratio determined by measuring the element temperature by the A/F sensor heater element impedance)
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• After engine warm-up (value fluctuates by battery condition, etc.)
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