Lambda sensors were first developed in 1977 to help automotive engines run more efficiently. They are installed in both gasoline and diesel automobiles and help to minimize harmful emissions, mostly gases like carbon monoxide and pollutants, produced by your vehicle.
The sensors are made to perform in accordance with government exhaust gas regulations. They are also known as oxygen sensors or O2 sensors because of the role they play in the running of your car.
Do diesel engines need oxygen?
This means that for complete burning of diesel fuel, less air is required. When the air mass flow remains constant, as it was in these tests, the extra oxygen is utilised to burn the diesel and increases combustion.
Do diesels have fuel trims?
Diesels don’t do “Fuel Trim” in the traditional sense. The amount of air permitted into a gasoline engine is the primary “control”; fuel is then metered (“trimmed”) into the engine to match the amount of incoming air. A diesel engine works in the other direction.
How does a zirconia oxygen sensor work?
Electrochemical sensors, such as zirconia oxygen sensors, are a type of sensor. To make a solid-state electrochemical fuel cell, zirconia dioxide is covered with a thin coating of platinum. If carbon monoxide is present in the test gas, O2 oxidizes it to CO2 and therefore initiates current flow. The zirconia sensor detects the difference between the concentrations of O2 in the exhaust gas and normal air, rather than directly sensing O2.
While zirconia oxygen sensors are most typically employed in automobiles and trucks to control air-fuel ratios, they are also useful in industrial settings. This technology is used in SST’s Zirconia Oxygen Measurement Sensor System to measure the oxygen content in flue gases, combustion control systems, coal, oil, gas, biomass, and oxygen generating systems, for example.
The tiny, zirconium-based element in this sort of oxygen sensor also does not need to be calibrated. When oxygen is blended with other gases, they preserve their precision.
When it comes to sensor benefits, Zirconia’s ability to perform at high temperatures and pressures opens up a world of possibilities for application integration, making this sensor suitable in a wide range of sectors. Every automobile, for example, employs two zirconia oxygen sensors, also known as lambda sensors, to optimize the fuel-air ratio for maximum combustion efficiency.
The oxygen measurement demands high temperatures, which is one of the disadvantages of zirconia sensors. The temperature of the sample gas will change when the sensor is used. Because zirconia oxygen sensors require a lot of power at high temperatures, they are not employed in battery-operated or mobile devices. Furthermore, zirconia sensors are not suitable for applications requiring ppm or ppb sensor accuracy.
The planar oxygen sensor is a variation on the zirconia oxygen sensor. It is moisture resistant, tough, and requires high temperatures to operate, just like a standard oxygen sensor. However, instead of zirconia, alumina is used, which can reach the requisite temperature faster. As a result, a planar oxygen sensor may begin monitoring oxygen levels in 10 seconds, as opposed to the typical zirconia sensor’s 30 second warm up time. This advancement makes it a better option for decreasing NOX emissions during cold starts than automobile lambda sensors.
What is lambda in diesel engines?
Oxygen probes, commonly known as lambda sensors, monitor the amount of oxygen in vehicle exhaust fumes. In relation to the stoichiometric air-fuel ratio, the air-fuel ratio, or lambda number (), specifies the mass ratio of air and fuel in the combustion chamber. When 0=1, perfect combustion conditions produce neither oxygen deficiency nor excess. A result of 1 suggests that there is too much air in the system (lean mixture). In spark ignition engines, the conventional lambda closed-loop control delivers a stoichiometric air-fuel combination for combustion. The method enriches the exhaust gases in a proportion that allows three-way catalytic converters to process them efficiently. Over a large load range, diesel engines or gasoline engines with direct injection run with a lean combustion, with the nitrogen oxide (NOx) content of emissions steeply increasing in tandem with the growing combustion temperature. Exhaust gas recirculation lowers the combustion temperature while also lowering the NOx content of released exhaust gases. The NOx storage catalytic converter can store residual NOx in the exhaust gas stream until it can be converted to nitrogen during rich combustion phases. For both exhaust recirculation and catalytic exhaust gas scrubbing, the lambda number represents the setpoint control value. The lambda number can be used as a starting point for determining the smoke limit at full load on diesel engines.
Is oxygen sensor same as lambda sensor?
The lambda sensor, also known as an oxygen sensor, is a tiny probe situated between the exhaust manifold and the catalytic converter on the automotive exhaust.
Are NOX and O2 sensors the same?
The oxygen sensors are all based on the Nernst Cell principle. The difference could simply be in the length of connection from the sensor to the control module, or it could be in the coding of the control module for the sensor.
Can you run an engine on pure oxygen?
The engine can only burn as much gas as the oxygen supply allows. As a result, if the car inhaled pure oxygen instead of 21 percent oxygen, it would be inhaling five times more oxygen. This would imply that it could burn five times the amount of fuel. And it would imply a fivefold increase in horsepower.