▼ Industry Background and Operational Challenges
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The aero engine fuel regulation system is the core mechanism controlling thrust output. From main combustor fuel metering in turbofan/turbojet engines to afterburner amplitude fuel supply, from multi-branch fuel nozzle distribution to independent APU fuel delivery, precise fuel control directly determines engine thrust response, fuel efficiency, and flight safety. With the widespread adoption of FADEC (Full Authority Digital Engine Control) systems, fuel regulation has imposed unprecedented demands on metering pump precision (typically ±0.5%), dynamic response (millisecond-level), and digital interfaces (CAN/ARINC).

▼ Typical Process Pain Points and JONSN Solutions
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▎±0.5% Main Fuel Metering Accuracy; Full-Envelope Flow Stability Difficult to Guarantee
Main combustor fuel metering requires error ≤±0.5%, covering the full range from idle flow (50 ml/min) to takeoff full load (20 L/min). Conventional gear pumps exhibit significant flow pulsation and poor linearity in the low-speed range, while internal leakage variations across wide pressure differentials and speed ranges cause metering drift, directly affecting combustor exit temperature (EGT) control and thrust management.

Solution: Main Fuel High-Precision Metering Module

· JONSN MPG Series magnetic drive micro gear pump, 40 μl/r displacement per revolution, paired with servo motor closed-loop control, full-range flow accuracy ≤±0.5%

· Precision-lapped gear set with ≤2 μm clearance, stable and predictable internal leakage rate, achieving linear output across all operating conditions via speed compensation

· 120 bar pressure-rated design meets the high differential pressure environment of fuel systems; pump body in 316L/nitrided steel, resistant to the poor lubricity of Jet A-1/RP-3 fuels

· Millisecond-level response (servo motor bandwidth >1 kHz), meeting rapid fuel-following demands during engine acceleration and deceleration

Recommended Configuration: JONSN MPG Series, servo closed-loop drive, metering accuracy ≤±0.5%, pressure rated 120 bar

▎Afterburner Fuel Transient High-Flow Delivery; Response Lag Affects Thrust
Afterburners require flow rates jumping from zero to tens of L/min within seconds. Conventional fuel pumps operate indirectly through fuel regulators, causing severe response lag. Particularly under extreme conditions such as Mach 1.5 and high g-load factors, any delay in fuel delivery can lead to insufficient afterburning thrust or combustion instability.

Solution: Afterburner Fast-Response Fuel Supply

· JONSN MRC Series medium-to-large flow gear pump (0.8–20 L/min), directly motor-driven without intermediate fuel regulators, response time <50 ms

· Multi-pump parallel or variable displacement configuration, 1:20 dynamic range, covering all operating conditions from minimum to full afterburner

· Output pressure up to 150 bar, meeting the high backpressure requirements upstream of afterburner nozzles

· MRC Series features cemented carbide gear sets + silicon carbide bearings, service life exceeding 10,000 hours, adapted to the intermittent duty characteristics of afterburner operation

Recommended Configuration: JONSN MRC Series, 0.8–20 L/min, response <50 ms, pressure rated 150 bar, scalable via multi-pump parallel

▎Fuel Nozzle Multi-Branch Distribution; Per-Line Flow Consistency Difficult to Ensure
Modern annular combustors typically have 12–24 fuel nozzles distributed across multiple fuel manifolds. Flow deviations between nozzles directly cause uneven combustor exit temperature distribution, potentially leading to excessive turbine blade thermal stress or combustion instability in severe cases. Conventional flow dividers exhibit large distribution errors in the low-flow range, unable to meet refined control requirements.

Solution: Nozzle Multi-Branch Precision Distribution Module

· JONSN MPG/MRA multi-pump head parallel configuration, with each nozzle or nozzle group independently equipped with a dedicated micro gear pump, ensuring independent, precise, and controllable flow for each line

· Same-batch MPG pump head displacement consistency ≤±1%, multi-branch parallel flow deviation <2%

· Independent servo drive per line enables nozzle-level fuel zoning control, collaborating with FADEC to actively optimize the combustor exit temperature field

· Miniaturized (single pump head ϕ20×80 mm), enabling compact layout around fuel manifolds, reducing line length and pressure losses

Recommended Configuration: JONSN MPG/MRA multi-pump parallel solution, independent servo drive per line, nozzle-level zoning control

▎FADEC Integration Demands Digital Control and Health Management Capability
As the “brain” of the engine, FADEC requires fully digital speed/flow closed-loop control of fuel metering pumps, while simultaneously acquiring real-time pump health status data. Traditional hydro-mechanical fuel regulators are difficult to interface digitally and lack self-test capability, unable to meet airworthiness requirements for Prognostics and Health Management (PHM) of engine control systems.

Solution: FADEC-Integrable Intelligent Metering Pump Module

· JONSN MPG/MRA/MRC entire series supports servo motor drive with built-in encoder feedback, communicating directly with FADEC via CAN bus (ARINC 825)/RS485

· Integrated temperature, pressure, and vibration sensors monitor real-time pump health status (bearing wear, gear clearance changes, temperature anomalies), supporting predictive maintenance

· Programmable fuel property tables (density-temperature curves) automatically compensate for the effect of fuel temperature variations on metering accuracy, maintaining ±0.5% accuracy across the full temperature range

· Compliant with DO-178C/DO-254 software and hardware airworthiness standards; comprehensive Design Assurance Level (DAL A/B) documentation support provided

Recommended Configuration: JONSN MPG/MRA Intelligent Type, CAN/RS485 interface, integrated PHM sensors, airworthiness documentation support

▎APU Fuel System Miniaturization, High Reliability, and Extreme Environment Adaptation
APUs are installed in the confined tail cone space of aircraft, imposing extremely stringent requirements on fuel pump size, weight, and reliability. Additionally, APUs must reliably start and operate under extreme conditions such as high ground temperatures and high-altitude low pressure. Conventional fuel pumps are prone to cavitation when inlet pressure is insufficient, leading to severe consequences including APU start failure and flameout.

Solution: APU Miniaturized Reliable Fuel Supply Module

· JONSN MPG micro gear pump measures only ϕ20×80 mm and weighs <200 g, directly integrable inside the APU Fuel Control Unit (FCU)

· Strong self-priming capability (vacuum >0.7 bar), reliably self-priming even under high-altitude low atmospheric pressure, eliminating the need for booster pump assistance

· MPG magnetic seal design ensures zero fuel leakage, eliminating APU compartment fire hazards and complying with FAA AC 20-135 fire protection requirements

· Service life >15,000 hours (MTBF >50,000 h), matching the full APU lifecycle without pump head replacement

Recommended Configuration: JONSN MPG Series, ϕ20×80 mm, <200 g, magnetic seal zero leakage, MTBF >50,000 h

▼ JONSN Fuel Regulation System Recommended Product Matrix
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▼ JONSN Fuel Regulation Solution Core Values
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▸ ±0.5% Main Fuel Metering Accuracy
The MPG Series paired with servo closed-loop drive achieves full-range metering accuracy ≤±0.5%, with automatic temperature compensation via fuel property tables, meeting the highest-level control requirements for main combustor thrust management.

▸ Millisecond-Level Dynamic Response
The MRC Series direct motor drive solution compresses fuel response time to <50 ms, eliminating the response lag of conventional fuel regulators and providing instant fuel response for afterburner and emergency acceleration conditions.

▸ Deep FADEC Integration
CAN (ARINC 825)/RS485 digital interfaces + integrated PHM sensors enable fully digital control and health management of fuel metering pumps, with DO-178C/DO-254 airworthiness documentation support.

▸ Nozzle-Level Zoning Control
The MPG/MRA multi-pump parallel solution achieves independent fuel supply control for each nozzle, with per-line deviation <2%, collaborating with FADEC to actively optimize the combustor exit temperature field.

▸ Magnetic Seal Zero Fuel Leakage
The entire series features magnetic coupling drive as standard, replacing dynamic shaft seals with static seals to thoroughly eliminate engine fire risks caused by fuel leakage, compliant with FAA fire protection clauses.

▸ Global Fuel Compatibility
Material compatibility verified for MIL-PRF-7024/Jet A-1/RP-3/TS-1 and other mainstream aviation fuels; special cemented carbide gear sets tolerate poor fuel lubricity, ensuring long-life reliable operation.

▼ Conclusion
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Aero engine fuel regulation is evolving from the traditional hydro-mechanical regulator system toward a FADEC-driven, fully digital, distributed fuel control architecture. Leveraging five core capabilities—MPG ±0.5% metering accuracy, MRC millisecond-level dynamic response, multi-pump parallel nozzle zoning control, deep FADEC integration, and magnetic seal zero leakage—JONSN provides a complete one-stop micro gear pump solution for main fuel metering, afterburner, nozzle distribution, FADEC integration, and APU fuel, supporting China's aero engine fuel control technology in advancing toward higher precision, faster response, and greater reliability.