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In recent years, China's motor vehicle pollutant discharge standards have been gradually improved. In 2001, the national first-stage motor vehicle emission standards began to be implemented. After 15 years of development, the national fourth-stage emission standards were implemented nationwide, and the fifth-phase emissions were implemented in key regions. Standards, bicycle pollutant emissions are reduced by more than 90%, effectively promoting the technical upgrading of the automotive industry. In order to further strengthen the prevention and control of motor vehicle pollution, reduce emissions from the source, and implement the requirements of the “Implementation of National VI Emission Standards and Corresponding Oil Products Standards” in the Outline of the Thirteenth Five-Year Plan for National Economic and Social Development, the Ministry of Environmental Protection, The General Administration of Quality Supervision, Inspection and Quarantine has introduced the Six Standards for Light Vehicles, which will be implemented from July 1, 2019.
However, in terms of vehicle exhaust emissions, our company has not developed a new product - the vehicle exhaust temperature sensor (HNS-PT200). Next, let's get to know what the car temperature sensor is.
HNS temperature sensors are used to monitor selective catalytic reduction units (SCR) for maximum catalytic efficiency. Its function is to feedback the temperature of the urea solution in real time to confirm whether the heater is working normally, to ensure the normal operation of the SCR system and the safety of the vehicle.
At low temperatures (-11 ° C), the aqueous urea solution will freeze. In order to ensure the normal operation of the SCR system under low ambient temperature conditions, the urea solution is prevented from freezing, so it needs to be solved by heating measures. When the vehicle is running in a low temperature environment, if the temperature measured by the urea tank temperature sensor is lower than the specified value (generally set to 0 °C), the engine electronic control unit will issue a command to open the coolant line to the urea tank to control the electromagnetic The valve uses the coolant of the engine to heat the urea tank to prevent the urea solution from freezing or thawing the frozen urea solution to ensure the normal operation of the aftertreatment system. When the temperature of the urea solution rises to the specified value (generally set to about 7 °C), the control solenoid valve is opened to prevent the urea solution from overheating.
PT200 exhaust aftertreatment high temperature sensor
Germany Heraeus Heraeus -70 ° C ~ +1000 ° C PT200 high temperature platinum resistance
Part Number: HEA420 (32208775) / HDA420 (32208674)
Heraeus HDA 420, HEA 420 platinum thermal resistance, long-term stability, ultra-high temperature range (-70 ° C ~ +1000 ° C) to ensure high precision and excellent compatibility is H series The main features of the platinum resistance temperature sensor. These sensors are particularly well-suited for applications in high-energy industries (typically including diesel exhaust high temperature sensors, white goods, HVAC and automotive manufacturing, and energy generation) as well as medical, industrial appliances and machinery industries.
* Diesel exhaust treatment high temperature sensor
* Diesel Oxidation Catalyst (DOC)
* Selective catalytic reduction (SCR) heating and protection
* Diesel particulate filter (DPF) regeneration control and protection
* Exhaust gas temperature (EGT) measurement
* Turbocharger (gasoline and diesel) overheat detection
The specific specifications of the H-type components are as follows:
Conventional Temperature Coefficient (TC): 3770; Suitable for a wider range of high temperature operating ranges.
Where is the car exhaust temperature sensor installed?
The exhaust gas temperature sensor is installed behind the catalyst converter. It is not only always at a high temperature, it is corrosively discharged into the body, and it is repeatedly subjected to sudden changes in temperature from the low temperature zone idling start to the full load high temperature condition. Vibration with the body: It is also waterproof, and there are countermeasures against flying stones on the road.
Automotive exhaust temperature sensor circuit diagram
When the exhaust gas temperature exceeds 900 °C, the exhaust gas temperature is activated by the alarm light. When the floor temperature of the car exceeds 125 °C, the resistance of the floor temperature sensor (normal temperature wash PTC thermistor) exceeds 2K, and the exhaust gas temperature sensor alarms. When the lamp is lit and the buzzer sounds; when the exhaust gas temperature is below 900 °C and the bottom plate temperature is lower than 125 °C, the bottom plate temperature sensor is lower than 2 kohms. At this time, the exhaust gas temperature warning light is off and the buzzer is not ring.
What happens if the exhaust gas temperature sensor is broken?
When the three-way catalytic converter is abnormally hot, the exhaust gas temperature sensor can quickly send out an alarm signal, so that the alarm can not be issued when the abnormal heat is generated, and the result is that the three-way catalytic converter is damaged by the high temperature.
Thermistor-Mov Electronics is a professional manufacturer of NTC thermistors, varistors and temperature sensors. It adheres to the business philosophy of "people-oriented, technology for nuclear, quality for life, users for marriage", and constantly improves technology, quality, environment and human resources. , information and knowledge management system, it is important to continuously innovate to meet the needs of the market, to provide first-class circuit protection solutions and services for users at home and abroad!
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