Differential pressure sensor for detection of automotive electronic diesel particulate filter systems

Automotive electronics is a general term for vehicle body automotive Electronic control devices and on-board automotive electronic control devices. At the same time, automotive electronics is considered to be a revolution in the development of automotive technology. The degree of automotive electronics is regarded as an important symbol to measure the level of modern automobiles, and is the most important technical measure to develop new models and improve vehicle performance. The application of automotive electronic technology in the future will make the car more intelligent. Smart cars are equipped with a variety of sensors, which can fully sense the conditions of drivers and passengers, information about traffic facilities and the surrounding environment, determine whether the occupants are in the best state, whether vehicles and people are in danger, and take corresponding measures in a timely manner.This article mainly focuses on the application of the diesel particulate filter system to make a brief introduction to the differential pressure sensor

  Differential pressure sensor for detection of automotive electronic diesel particulate filter systems

As more and more people pay attention to the automotive industry, car manufacturers believe that increasing the number of automotive electronic devices and promoting automotive electronics are important and effective means to capture the future automotive market. Therefore, the requirements of fuel economy and emission standards have also become stricter, and more and more systems are applied to automobiles, such as intake/exhaust management systems, fuel vapor management systems, brake booster systems, and diesel particulate filters. system, etc. These systems all need the pressure information quickly and accurately obtained by the pressure sensor to determine the state of the system and the next action.

Due to the physical characteristics of diesel engines, in addition to carbon monoxide, hydrocarbons, and nitrogen oxides, there are some tiny particulates in the exhaust gas emitted by them. These particulates are the main cause of black smoke. In order to meet the requirements of emission standards, the usual method is to place a trap in the exhaust emission part of the vehicle to capture the tiny particles in the exhaust gas. The disadvantage of this method is that the exhaust gas discharge passage is gradually blocked as the trapped particles accumulate. Therefore, more and more diesel engines are equipped with Diesel Particulate Filter (DPF, Diesel Particulate Filter). When the exhaust gas generated by the combustion of diesel engine passes through the diesel particulate filter, the porous system of the filter will capture the particles in it. When the diesel exhaust particles continue to accumulate in the filter, the filter will be saturated or even blocked. The filter is regenerated. It is very important to choose a reasonable “regeneration” trigger time. The differential pressure sensor sends the differential pressure signal to the ECU, and the ECU judges the accumulation degree of particles in the trap according to the differential pressure, and determines the trigger timing of “regeneration” and the amount of additional fuel injected. At the same time, the ECU can also adjust the temperature of the exhaust gas by controlling the EGR valve. A differential pressure sensor is used to detect the pressure difference between the air inlet and the air outlet of the filter. When the pressure difference is higher than the set threshold, it is considered that the filter is saturated, the ECU controls to increase the engine temperature, and the engine emits high-temperature exhaust gas to Burns the particles stored in the filter to complete the regeneration of the filter.


The differential pressure sensor provided by Gongcaiwang – SDP600 series is a digital differential pressure sensor that can be dynamically measured. This sensor has IC digital output, even in the case of micro differential pressure (less than 10Pa), it can still ensure extremely high measurement sensitivity and accuracy. The SDP600 series differential pressure sensors provide excellent long-term stability, making drift problems a thing of the past. With the excellent level of integration and compact packaging of the SDP600 series differential pressure sensors, ISWEEK is able to provide fast, reliable, and compact CMOSens sensors at an affordable price. Fully calibrated and temperature compensated sensors are available in different models. The SDP600 differential pressure sensor is sheet metal mounted and sealed with an O-ring, while the SDP610 differential pressure sensor can be connected to a hose. The SDP600 series of differential pressure sensors are designed for high quality mass production and are ideal for demanding OEM applications. Due to the high temperature of the exhaust gas and the presence of a variety of corrosive gases and particles, media compatibility issues need to be considered.

It is worth noting that the differential pressure sensor needs to pay attention to some matters in use, such as: the measured medium is not allowed to freeze, otherwise the sensor element isolation diaphragm will be damaged, resulting in damage to the transmitter. If necessary, the transmitter needs to be temperature protected. To prevent freezing; do not apply a voltage higher than 36V to the transmitter to cause damage to the transmitter; when measuring steam or other high-temperature media, its temperature should not exceed the limit temperature of the transmitter when it is used, higher than The extreme temperature used by the transmitter must use a heat sink; when measuring steam or other high-temperature media, a heat sink should be used to connect the transmitter and the pipeline, and use the pressure on the pipeline to transmit it to the transformer. When the measured medium is water vapor, an appropriate amount of water should be injected into the heat pipe to prevent the superheated steam from directly contacting the transmitter and damaging the sensor; do not touch the diaphragm with hard objects, which may damage the isolation diaphragm, etc. The single differential pressure sensor is not used a lot at present. Now there are many pressure sensors that can measure both absolute pressure and differential pressure, which is very convenient for customers to use. It is believed that there will be no separate differential pressure sensor in the future, and the differential pressure sensor is being combined with the absolute pressure sensor.

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