Dongfeng LoongGine Engine parts Exhaust pressure sensor assembly 3611360-E9300

As a key feedback component of the engine’s exhaust system, this assembly’s core function is to real-time monitor the exhaust gas pressure in the engine’s exhaust manifold and transmit accurate pressure signals to the engine ECU (Electronic Control Unit). It adopts the piezoresistive sensing principle: the internal pressure-sensitive chip (made of silicon) deforms when exposed to exhaust gas pressure, changing its electrical resistance. This resistance change is converted into a standard analog electrical signal (0.5-4.5V DC) via the built-in signal processing circuit, which the ECU uses to adjust critical engine parameters—such as fuel injection quantity, turbocharger boost pressure, and EGR (Exhaust Gas Recirculation) valve opening. This not only optimizes engine power output and fuel efficiency but also prevents overpressure damage to the exhaust manifold and turbocharger

Designed to meet the rigorous demands of diesel engine operation, the sensor assembly boasts exceptional performance and precision:

Pressure Measurement Range: Covers 0-1.0 MPa, fully matching the normal exhaust pressure range of Dongfeng LoongGine engines (0.1-0.8 MPa under full-load conditions) and providing a safety margin for extreme working scenarios.

Measurement Accuracy: ±1.5% FS (Full Scale), ensuring minimal signal deviation—critical for the ECU to make accurate control decisions and avoid issues like unstable idle speed or excessive fuel consumption.

Response Time: ≤100 ms, enabling rapid feedback of exhaust pressure changes (e.g., during sudden acceleration or load increases) to ensure real-time engine adjustment.

Operating Voltage: 9-32V DC, adapting to the voltage fluctuation of commercial vehicle electrical systems and maintaining stable performance even under low-voltage startup conditions

The assembly features a robust structural design and multi-layer protection to withstand harsh engine environments:

Sensing Probe: The pressure sampling probe is made of heat-resistant stainless steel (316L), which can endure continuous high temperatures up to 300℃ (the maximum exhaust temperature of LoongGine engines) without deformation or corrosion.

Housing & Protection: The outer housing is made of high-strength engineering plastic (PA66+GF30) with flame-retardant properties, and the entire assembly meets IP6K9K waterproof and dustproof standards—effectively resisting water ingress, oil pollution, and dust accumulation in the engine compartment.

Electrical Connection: The connector adopts a rubber sealing ring and snap-in locking structure, ensuring tight connection and preventing signal interference or short circuits caused by vibration or moisture.

Heat Insulation Design: A ceramic heat insulation washer is installed between the probe and housing to block heat transfer from the exhaust manifold, protecting the internal circuit board from high-temperature damage

The sensor assembly is widely applied in Dongfeng LoongGine-powered vehicles and machinery, including:

Dongfeng heavy-duty trucks for long-distance cargo transportation (where fuel efficiency and emission compliance are critical);

Medium-duty trucks and buses used for urban logistics or passenger transportation (requiring stable engine performance under frequent stop-start conditions);

Engineering machinery such as LoongGine-equipped excavators and wheel loaders (operating in dusty, high-vibration, and high-temperature environments).

In terms of installation, it offers distinct advantages:

Direct OEM Replacement: Matches the original sensor’s mounting position, thread size, and connector type—no modifications to the exhaust manifold or wiring harness are needed, and installation can be completed with standard tools (e.g., a torque wrench) in 20-30 minutes.

Pre-Calibrated Configuration: The sensor is factory-calibrated to LoongGine’s engine parameters, eliminating the need for on-site calibration after installation and reducing maintenance complexity.

Durability & Reliability: Under normal operating conditions, the assembly has a service life of over 80,000 km, reducing the frequency of replacement and lowering maintenance costs for fleet operators and repair shops