HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL [SKYACTIV-G 2.5T]

id0140h0785600

Outline

• Performs duty control of the heater according to the engine operation conditions (exhaust gas temperature) for HO2S heater protection and enhanced emission performance.

• By controlling the HO2S heater, stable detection of oxygen concentration is possible even with low exhaust gas temperature, and feedback control for the fuel injection control is possible even after cold engine start, enhancing the emission performance under cold temperatures.

Block Diagram

am2uun00001065

Operation

• The PCM operates the HO2S heater based on the following control conditions.

Output duty ratio

Control condition

0 %

•  Engine stopped

•  Fuel cut injection control is in start zone

•  Engine coolant temperature is −10 °C {14 °F} or less

•  Other than battery voltage of 10—16 V

•  Within a fixed period of time after engine start (varies according to engine coolant temperature)

30―50 %

•  HO2S not activated

0―100 %

(Determined by engine speed and charging efficiency)

•  Other than the above

Output duty ratio	Control condition
0 %	• Engine stopped • Fuel cut injection control is in start zone • Engine coolant temperature is −10 °C {14 °F} or less • Other than battery voltage of 10—16 V • Within a fixed period of time after engine start (varies according to engine coolant temperature)
30―50 %	• HO2S not activated
0―100 % (Determined by engine speed and charging efficiency)	• Other than the above