In the evolving landscape of automotive technology, precision, durability, and environmental responsibility are no longer optional—they’re essential. At the forefront of this transformation stands WEICHAI TORCH Technology Co., Ltd., a leading subsidiary of Weichai Power, renowned for its cutting-edge ignition systems and sensor innovations. With a legacy dating back to 1961 and a portfolio that spans spark plugs, ignition coils, and high-performance sensors, TORCH continues to redefine standards in engine management and emission control.

Ceramic Expertise Meets Sensor Precision

TORCH’s sensor development is deeply rooted in advanced ceramic technology. By leveraging zirconia-sensitive ceramic chips and proprietary ceramic film printing processes, TORCH has built a vertically integrated production system—from raw materials to finished sensor elements. This enables unmatched control over quality, performance, and customization.

The company’s investment in automated casting machines, precision drying lines, and German sintering furnaces ensures that each sensor meets stringent global standards. These capabilities have earned TORCH certifications from ISO9001 to FORD Q1 and recognition as a GM global partner.

NOx Sensors: Accuracy in Diesel Emission Monitoring

TORCH NOx sensors are engineered to measure nitrogen oxides (NO and NO₂) and oxygen concentrations in diesel exhaust with high precision. Comprising a sensor probe and an electronic control unit, these sensors offer:

• Fast response times (≤3550ms for O₂, ≤3900ms for NO₂)
• Compatibility with 12V/24V systems
• Robust anti-interference performance

Models like HJ24T126 and HJ24H421 are widely compatible with major diesel platforms including Weichai, Yuchai, Sinotruk, and Dongfeng Cummins, supporting both flat five-pin and square four-pin interfaces.

Oxygen Sensors: Optimizing Combustion and Emissions

TORCH oxygen sensors play a critical role in fuel-air ratio control. Installed in the exhaust system, they monitor oxygen levels and feed real-time data to the ECU, enabling:

• Optimal combustion efficiency
• Reduced HC, CO, and NOx emissions
• Enhanced fuel economy

Technical highlights include:

• Heater power: 7W
• Lifetime: >60,000 km
• Operating temperature: up to 930°C (sensor element)

Installation guidelines emphasize torque precision (40–60Nm), proper harness routing, and post-installation diagnostics to ensure fault-free operation.

Expanding the Sensor Family: Pressure, Temperature, and More

Beyond NOx and oxygen sensors, TORCH offers a comprehensive sensor suite for both powertrain and aftertreatment systems:

• Pressure Sensors: Ceramic capacitive sensors for turbo boost, oil pressure, exhaust backpressure, and transmission control. These sensors feature high thermal stability, wide pressure ranges, and customizable output voltages.
• Temperature & Humidity Sensors: Designed for EGR and intake systems, ensuring accurate thermal feedback.
• DPF Differential Pressure Sensors: Critical for diesel particulate filter monitoring and regeneration control.

Material Innovation: Silicon Nitride Substrates

TORCH’s ceramic substrates, particularly silicon nitride (Si₃N₄), offer superior mechanical and thermal properties:

• Flexural strength >700 MPa
• Thermal conductivity >80 W/(m·K)
• Dielectric strength >15 kV/mm

These substrates are essential for high-reliability applications in EVs, rail transit, and power semiconductors.

Conclusion: A Vision for Cleaner Mobility

TORCH’s commitment to material science, sensor integration, and automotive excellence positions it as a key player in the global push for cleaner, smarter mobility. Whether it’s reducing diesel emissions or optimizing combustion in gasoline engines, TORCH sensors deliver the intelligence and reliability that modern vehicles demand.

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