Signal shape and setpoint values

Thanks to a residual oxygen content that equates to a mixture composition of lambda = 1, the voltage measurement on the measuring cell indicates a voltage of 450 millivolts. When lambda = 1, the composition of the exhaust gas of the different material is ideal.

Fig 1: Down Stream Oxygen Sensor Signal Shape And Setpoint Values Graph

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Voltage to measuring cell
2	Signal path
3	Lambda

Observe the following setpoint values for the monitoring sensor:

Variable	Value
Lower voltage range of oxygen sensor heating	10.7 to 16.5 V
Voltage of oxygen sensor heating in warm-up phase	4 V
Operating temperature	≥ 350 °C
Heating resistance at 20 °C	9 Ω ±2 Ω
Maximum pump current	2.2 to 2.6 Ω