Published On September 20, 2019
Under the greenhouse effect, global warming makes extreme heat more unbearable, and the whole earth is covered with a thick quilt. The human body can adapt to high temperatures up to 40 degrees, but do you know? Your car engine and other auto parts must withstand a much higher temperature than you can.
Why not let the exhaust gas temperature sensor help your car engine cool down? This device is much more meaningful to your car than air conditioning because no car owner wants his car engine to retire early.
EGT sensors monitor the temperature for turbochargers, catalytic converters, diesel particulate filters, and nitrogen oxide reduction systems. They are used to monitor the optimum working point, protect the relevant components from temperature overload, and keep them in the ideal temperature range to obtain the optimum conversion rate, thus making them an important part to reduce harmful emissions from vehicles.
Normally, EGT sensor Working Procedure is like this:
`` Reads the temperature of the exhaust ￫sends information to ECU￫ ECU controls Exhaust After Treatment System￫ reduces harmful emissions
Nowadays, exhaust temperature sensors are used both in cars equipped with diesel and in cars equipped with gasoline engines.
Gasoline engine: In a gasoline engine, the main function of the waste gas temperature sensor is to prevent components from overheating. In this case, the key components to be monitored are mainly turbochargers and catalytic converters. If the temperature sensor sends a signal that the temperature of these components is too high, the engine control unit will take appropriate measures to reduce the temperature, such as reducing the boost pressure (to reduce power). According to the setting of the engine management system, the protection of the catalytic converter can be provided by cooling the catalytic converter by increasing fuel injection (thereby increasing fuel consumption). In this regard, advanced modern engines with direct injection and sometimes lean-burn operations are particularly important and require appropriate monitoring.
Diesel engine: In the diesel engine, the waste gas temperature sensor is also used to monitor the temperature of the diesel particulate filter (dpf). In this case, the focus is not on preventing overheating. More importantly, it is important to determine whether the temperature required for self-cleaning (regeneration) of the particulate filter has reached. Further application of the waste gas temperature sensor is also used in the nitrogen oxide (NOx) reduction module. These include nitrogen oxide storage catalysts for gasoline and SCR or LNT catalytic converters for diesel engines. Here, the purpose of temperature monitoring is to check whether the minimum temperature required for the operation of the catalytic converter is reached and to prevent its overheating.
Next, let's define "good quality EGTs" to find really good products in the dazzling EGTs Market. Although different suppliers may have different answers to this question, we can still extract some common features from current trends.
Here is the checklist:
· A good quality EGTs offers fast time response and is more consistent (At 300 degrees Celsius, the reaction speed is less than 5 seconds at 70 m/s of airflow, while at 600 degrees Celsius, the reaction speed is less than 11 seconds at 11 m/s of airflow.)
· It can mount in any orientation with a closed tip design
· It has a small size: Processing technology uses fine ceramic particles to produce a small thermal resistor (sensing element) with a special shape. The sensing part is inserted into the exhaust pipe through a thermistor and adopts a single tube structure instead of the traditional two-tube structure of the exhaust temperature sensor. Compared with the traditional waste gas temperature sensor, the volume is reduced by more than 90%.
· It has a high-precision detection level: From -40 degrees Celsius to 1000 degrees Celsius, the error is controlled below 2%.
·It can withstand vibration even near the engine.