What impact does the PTCEGT sensor have on emission control?

1. Accurate Temperature Monitoring Improves Combustion Efficiency

Real-time Temperature Feedback: The PTC EGT sensor utilizes the positive temperature change characteristic of platinum resistance to convert exhaust gas temperature into a voltage signal in real time, providing the ECU with closed-loop control.

Air-fuel ratio and ignition timing optimization: Based on the temperature profile provided by the sensor, the ECU dynamically adjusts the air-fuel ratio and ignition advance angle, resulting in more complete combustion and a significant reduction in unburned fuel emissions.

Boost pressure regulation: In turbocharged engines, after the sensor monitors the exhaust temperature, the ECU can appropriately reduce the boost pressure to prevent combustion runaway caused by high temperatures, thereby reducing nitrogen oxide (NOx) formation.

Cold start protection: During cold starts, the exhaust temperature rises rapidly. The sensor's rapid response helps the ECU limit fuel injection, avoiding instantaneous high emissions due to sudden temperature increases.

2. Technical support for emission regulatory compliance

Meets Euro VI and US EPA standards: Strict emission regulations such as Euro VI and EPA have clear upper limits on exhaust temperature. The high accuracy and long-term stability of the PTC EGT sensor ensure that it can still provide compliant temperature records during long-term operation.

Fault diagnosis and fault tolerance mechanism: When a sensor malfunctions, the ECU reads the fault code and switches to a fixed alternative value, simultaneously triggering a diagnostic process to prevent excessive emissions due to erroneous temperature information.

Aftertreatment System Co-control: Sensor data is used to determine key thresholds such as Diesel Particulate Filter (DPF) regeneration temperature and Catalytic Converter (CAT) protection temperature, ensuring the aftertreatment system operates within its optimal temperature range and preventing emission failure due to insufficient or excessive temperature.

Compliance Reporting and Data Archiving: Vehicle manufacturers can export temperature profiles collected by sensors for emissions testing reports, meeting regulatory requirements for data traceability.

3. Synergy with the Aftertreatment System

DPF Regeneration Temperature Monitoring: In diesel engines, the PTC EGT sensor monitors exhaust temperature in real time. DPF regeneration is only initiated when the temperature reaches a preset regeneration threshold (approximately 600°C), preventing increased particulate emissions due to incomplete regeneration.

Catalytic Converter Protection: Sensors located before and after the turbine detect the catalytic converter inlet temperature. If the temperature exceeds the safe limit, the ECU reduces fuel supply or increases coolant flow to prevent catalyst overheating and failure.

Preventing Overheating-Induced Component Damage: Through continuous monitoring, the system can proactively reduce load or shut down the engine when temperatures rise abnormally, protecting critical components such as the turbocharger and exhaust valves, indirectly reducing abnormal emissions caused by component failure.

Optimizing Regenerative Fuel Consumption: Precise temperature judgment ensures the DPF regeneration process only activates when necessary, avoiding unnecessary fuel injection increases, thus improving fuel economy while maintaining low emissions.

4. Comprehensive Benefits of Energy Saving and Emission Reduction

Reduced Fuel Consumption: By optimizing the combustion process and rationally controlling turbocharging and regeneration strategies, overall engine fuel consumption can be reduced by 2%–5%, directly reducing carbon dioxide (CO₂) emissions.

Reduced Engine Thermal Load: Real-time temperature monitoring helps the ECU adjust the cooling system appropriately under high load conditions, reducing engine thermal stress, extending service life, and indirectly reducing energy consumption caused by maintenance and replacement.

Improved Overall Emission Control Efficiency: The high reliability of the PTC EGT sensor ensures the aftertreatment system always operates within its optimal range, maximizing the reduction of nitrogen oxides (NOx) and particulate matter (PM), aligning with green and low-carbon development goals.

Support for intelligent engine management: In vehicle network (CAN) and advanced driver assistance system (ADAS), sensor data can be used to train machine learning models, enabling more refined emission prediction and control, and further promoting the reduction of the overall vehicle carbon footprint.