The Lambda sensor is also called the oxygen or the O2 sensor and is a very important sensor for automotive applications. It is mounted in the exhaust manifold of the car and it senses the amount of oxygen present in the exhaust gas. Basically this sensor helps determine if the air-fuel ratio is rich or lean. By determining this and adjusting the air-fuel ration the engine can be made to run more efficiently and with less pollution. When the air-fuel mixture is lean the output of the sensor is around 0.2V and when the air-fuel mixture is rich the output is around 0.8V. and for perfect combustion the output of sensor is 0.45V. The Electronic control unit of the Car uses the output of this sensor to adjust the air-fuel ratio. For a perfect combustion the air quantity is 14.7 per 1 part of fuel. This is called the stochiometric ratio.
When the ECU sees the high voltage it commands the fuel injection system to go lean. And when the ECU sees the low voltage it commands the fuel injection system to go rich.
When the ECU sees the high voltage it commands the fuel injection system to go lean. And when the ECU sees the low voltage it commands the fuel injection system to go rich.
The lambda sensor is like a generator. It produces its own voltage when it is hot. It is made up of zirconium dioxide or zirconia. It is based on the nernst cell. Ist electrodes provide the voltage corresponding to the amount of oxygen present in the exhaust gas.Below are the Recommended links
