Čínský dodavatel senzoru teploty výfukových plynů pro automobilový průmysl

Systematic analysis of automotive exhaust temperature sensors, comprehensive core functions, technical parameters, application scenarios and development trends:
I. Core functions and working principles
‌Real-time monitoring and protection‌:
Installed at the outlet of the exhaust manifold, three-way catalytic converter or turbocharger, directly detect the high-temperature exhaust gas temperature (the working range is usually 200℃–1000℃).
Core function: Prevent the catalyst from overheating and melting (efficiency decreases when it exceeds 300℃, and it may be damaged above 400℃), and control the regeneration temperature of the particulate filter (DPF) in diesel vehicles.

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‌Signal feedback mechanism‌
‌Platinum resistance type (such as PT200): The resistance is 200Ω at 0℃, and the resistance increases at a uniform rate as the temperature rises, with an accuracy of ±1.5% (above 300℃).
‌Thermocouple/NTC type‌: Thermocouples are resistant to ultra-high temperatures but have low accuracy, and NTCs are low in cost but limited in high temperature range.

Ii. Comparison of key technical parameters and types

Parameters ‌‌	‌Platinum resistance (PT200) ‌	‌Thermocouple/NTC type ‌ ‌
Temperature range ‌	-40℃ ~ +850 ℃	Maximum 1000℃ (termočlánek)
‌‌Accuracy ‌	±2.5℃（-40~300℃）	±2%~5% (high temperature section)
‌Response speed ‌	Střední	Pomalý (anti-thermal shock design)
‌‌Packaging material ‌‌	Stainless steel corrosion-resistant housing	Metal housing (anti-sulfide corrosion)
‌‌Applicable scenarios ‌‌	DPF regeneration control, SCR system	Gasoline vehicle catalyst protection

Iii. Typical installation location and fault impact
‌Installation location‌:
Behind the three-way catalytic converter (gasoline vehicle) or DPF inlet (diesel vehicle), some models have multiple sensors arranged in the middle/end of the exhaust pipe.

‌Fault symptoms and consequences‌:
‌Failure performance‌: Abnormal lighting of the exhaust warning light (exceeding the 900℃ threshold), difficulty in cold start, and reduced engine power.
‌Chain risk‌: Catalyst high temperature meltdown (repair cost exceeds 10,000 yuan), DPF regeneration failure leading to excessive emissions.

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IV. Technology evolution trend
‌Improvement of accuracy and reliability‌:
PT200 sensors gradually replace traditional thermocouples, because their linear output characteristics are more suitable for OBD diagnostic systems (error <±1.5%).

‌Extended application of new energy‌
Monitor the temperature of the turbocharger (T3 sensor) in hybrid models to prevent thermal shock when switching between motor and engine.

‌ Integrated Design‌
The sensor is linked with the EGR valve to dynamically adjust the exhaust gas recirculation flow and optimize emission control.

Industry Trends: By 2025, the penetration rate of platinum resistance sensors in the diesel vehicle market will exceed 60%, and high-temperature direct measurement technology (such as laser temperature measurement) is in the laboratory verification stage.