Derivative works — US Patent 11143120

Defensive Disclosure Document for US11143120

Patent Title: Fuel system for a multi-fuel internal combustion engine
Patent Number: US11143120
Current Assignee: Champion Power Equipment Inc
Analysis Date: 2026-05-18

This document outlines defensive disclosures for US patent 11143120, focusing on creating prior art for potential future incremental improvements by competitors. The aim is to establish obviousness or non-novelty for variations of the core claims.

Derivations from Claim 1

Claim 1: A multi-fuel engine comprising: an engine operable on a liquid fuel and a gaseous fuel; a carburetor attached to an intake of the engine to mix air and fuel and connect a liquid fuel source to the intake, the carburetor comprising a float bowl; a liquid cutoff solenoid coupled to open and close a liquid fuel path to the engine; a gaseous cutoff solenoid coupled to open and close a gaseous fuel source to the engine; a switch selectively coupling a power source to the liquid cutoff solenoid and the gaseous cutoff solenoid to open and close the liquid fuel path and the gaseous fuel path; and one or more timing circuits electrically coupled to the liquid cutoff solenoid and the gaseous cutoff solenoid that operate to control an actuation time of the liquid cutoff solenoid and the gaseous cutoff solenoid.

Derivative 1.1: Material & Component Substitution - Piezoelectric Actuators for Solenoids

Enabling Description: This derivative replaces the electromagnetic solenoids (liquid cutoff solenoid and gaseous cutoff solenoid) with high-speed piezoelectric actuators. Each piezoelectric actuator consists of a stack of piezoceramic elements (e.g., Lead Zirconate Titanate, PZT-5H) integrated with a mechanical amplifying structure (e.g., flextensional mechanism) to achieve sufficient stroke (e.g., 100-200 µm) and force (e.g., 5-10 N) for rapid valve opening/closing. The timing circuits are adapted to provide precise, high-voltage (e.g., 0-150V) control signals to the piezoelectric elements, leveraging their microsecond-level response times for ultra-fast and precise fuel flow modulation, minimizing overlap during "on-the-fly" fuel switching. The valve seats would be fabricated from wear-resistant ceramics (e.g., alumina or silicon nitride) to withstand frequent, high-impact actuation cycles.

Mermaid Diagram:

flowchart TD
    PS[Power Source] --> S[Switch]
    S -- Control Signal --> TC[Timing Circuit - Piezo Driver]
    TC -- High Voltage Pulse --> PA_L[Piezo Actuator Liquid]
    TC -- High Voltage Pulse --> PA_G[Piezo Actuator Gaseous]
    PA_L -- Actuates Valve --> LFP[Liquid Fuel Path]
    PA_G -- Actuates Valve --> GFP[Gaseous Fuel Path]
    LFP --> Carb[Carburetor with Float Bowl]
    GFP --> Carb
    Carb --> Engine[Multi-Fuel Engine]

Derivative 1.2: Operational Parameter Expansion - Micro-Scale Fuel Delivery System for Portable Power

Enabling Description: This variation scales down the multi-fuel engine system for micro-power generation, such as for advanced portable electronics or miniature drones. The engine is a micro-internal combustion engine (e.g., 1-5 cc displacement). The carburetor is a micro-carburetor fabricated using MEMS (Micro-Electro-Mechanical Systems) techniques, featuring etched fluidic channels and a micro-float bowl. Liquid and gaseous fuel cutoff is managed by micro-solenoid valves or micro-piezoelectric valves, specifically designed for ultra-low flow rates (e.g., 10-100 µL/min for liquid fuel, 1-10 mL/min for gaseous fuel). The timing circuits are integrated into a System-on-Chip (SoC) using low-power CMOS technology, enabling precise fuel switching within milliseconds, crucial for maintaining stable power output in rapidly changing load conditions characteristic of portable devices. Fuel pressures are scaled appropriately, with liquid fuel delivered by a micro-pump and gaseous fuel regulated by a micro-pressure sensor and valve assembly.

Mermaid Diagram:

graph TD
    MP[Micro-Power Source] --> MS[Micro-Switch]
    MS -- Control --> SoC[SoC - Timing & Control]
    SoC -- Actuation Signal --> MV_L[Micro Valve Liquid]
    SoC -- Actuation Signal --> MV_G[Micro Valve Gaseous]
    MPump[Micro-Pump] -- Liquid Fuel --> MV_L
    MGasReg[Micro Gas Regulator] -- Gaseous Fuel --> MV_G
    MV_L --> MCarb[Micro-Carburetor]
    MV_G --> MCarb
    MCarb --> MEngine[Micro-ICE]

Derivative 1.3: Cross-Domain Application - Fuel System for Emergency Response Robotics

Enabling Description: This multi-fuel system is integrated into a robotic platform for prolonged emergency response operations in hazardous environments, where primary fuel sources may be intermittent or unavailable. The engine powers the robot's locomotion and onboard systems. The liquid fuel could be a high-energy density alcohol fuel (e.g., methanol, ethanol) for sustained operations, while the gaseous fuel is a readily available, safely stored alternative (e.g., compressed hydrogen, natural gas from localized extraction points). The carburetor is hardened for extreme temperatures (-40°C to 80°C) and vibration, with solenoids rated for intrinsic safety in explosive atmospheres (ATEX certified). The timing circuits are designed with redundancy and fault tolerance, using radiation-hardened components for deployment in radioactively contaminated zones. The switch supports remote control and autonomous fuel selection based on sensor inputs (e.g., fuel level, environmental gas composition, mission profile).

Mermaid Diagram:

graph TD
    SubGraph FuelSystem
        direction LR
        LFS[Liquid Fuel Source (Alcohol)] -- Liquid Fuel Line --> LCS[Liquid Cutoff Solenoid]
        GFS[Gaseous Fuel Source (H2/NG)] -- Gaseous Fuel Line --> GCS[Gaseous Cutoff Solenoid]
        LCS --> Carb[Hardened Carburetor]
        GCS --> Carb
    end

    PS[Robotic Power Source] --> FC[Fault-Tolerant Controller]
    FC -- Control Signal --> LCS
    FC -- Control Signal --> GCS
    FC -- Control Signal --> TC[Redundant Timing Circuits]
    TC -- Timing --> LCS
    TC -- Timing --> GCS
    Carb --> Engine[Robotic Engine (ICE)]
    Engine --> RobotSys[Robot Systems & Locomotion]
    EnvSens[Environmental Sensors] -- Data --> FC
    RC[Remote Control] -- Commands --> FC

Derivative 1.4: Integration with Emerging Tech - AI-Optimized Predictive Fuel Switching

Enabling Description: The multi-fuel engine system incorporates an AI-driven optimization module for predictive fuel switching. IoT sensors (e.g., fuel level, engine load, exhaust emissions, ambient temperature, fuel quality via spectroscopic analysis) provide real-time data to an edge computing unit. A machine learning model, trained on historical engine performance data, environmental conditions, and fuel cost/availability, predicts optimal fuel switching points to maximize efficiency, minimize emissions, or extend engine life. The timing circuits are dynamically adjusted by the AI controller to implement precise fuel changeovers, potentially introducing micro-delays or overlaps based on real-time engine state. Blockchain technology is used to record fuel consumption, quality, and supply chain provenance, ensuring verifiable data for regulatory compliance and automated fuel ordering. The switch can be overridden manually but defaults to AI-driven control.

Mermaid Diagram:

graph TD
    SubGraph FuelSystem
        LFS[Liquid Fuel Source] --> LCS[Liquid Cutoff Solenoid]
        GFS[Gaseous Fuel Source] --> GCS[Gaseous Cutoff Solenoid]
        LCS --> Carb[Carburetor]
        GCS --> Carb
    end

    Carb --> Engine[Multi-Fuel Engine]
    Engine --> Alt[Alternator]
    Alt --> PS[Power Source]

    Sensors[IoT Sensors (Fuel Level, Load, Emissions, Temp, Quality)] --> EdgeComp[Edge Computing Unit]
    EdgeComp -- Real-time Data --> AIM[AI Optimization Module]
    AIM -- Predictive Control --> TC[Dynamic Timing Circuits]
    TC -- Actuation Commands --> LCS
    TC -- Actuation Commands --> GCS
    AIM -- Blockchain Transactions --> BC[Blockchain Ledger]
    BC -- Verifiable Data --> SC[Supply Chain Management]
    ManInput[Manual Override Switch] -- Input --> AIM

Derivative 1.5: The "Inverse" or Failure Mode - Safe-Shutdown Fuel System

Enabling Description: This system is designed for a safe-shutdown mode, where in the event of a critical system malfunction (e.g., loss of power, severe engine overheat, detected fuel leak, or control system failure), all fuel flow to the engine is immediately and reliably cut off. The liquid and gaseous cutoff solenoids are "fail-safe closed" types, requiring continuous power to remain open. The timing circuits include a watchdog timer that, upon detecting a control signal absence or anomaly, de-energizes all solenoids, causing them to default to the closed position. The float bowl is equipped with a passive drain valve that opens upon loss of power, allowing residual liquid fuel to drain into a fire-resistant containment sump, preventing an overly rich condition or fire hazard. Gaseous fuel lines incorporate thermally activated cutoff valves that trigger if exposed to high temperatures, in addition to the electrically controlled solenoid.

Mermaid Diagram:

stateDiagram-v2
    [*] --> Idle : System Start
    Idle --> Liquid_Mode : Switch to Liquid
    Idle --> Gaseous_Mode : Switch to Gaseous

    Liquid_Mode --> Gaseous_Mode : Fuel Switch (on-the-fly)
    Gaseous_Mode --> Liquid_Mode : Fuel Switch (on-the-fly)

    Liquid_Mode --> Safe_Shutdown : Critical Malfunction Detected
    Gaseous_Mode --> Safe_Shutdown : Critical Malfunction Detected
    Idle --> Safe_Shutdown : Critical Malfunction Detected

    Safe_Shutdown --> [*] : System De-energized

    state Liquid_Mode {
        LCS_Open: Liquid Solenoid OPEN (Powered)
        GCS_Closed: Gaseous Solenoid CLOSED (Unpowered)
    }
    state Gaseous_Mode {
        LCS_Closed: Liquid Solenoid CLOSED (Unpowered)
        GCS_Open: Gaseous Solenoid OPEN (Powered)
    }
    state Safe_Shutdown {
        All_Solenoids_Closed: All Solenoids FAIL-SAFE CLOSED (Unpowered)
        Float_Bowl_Drained: Float Bowl Passive Drain OPEN
        Therm_Valves_Closed: Thermal Cutoff Valves CLOSED
    }

Derivations from Claim 12

Claim 12: A multi-fuel generator and fuel delivery system comprising: a multi-fuel internal combustion engine configured to operate on a liquid fuel supplied from a liquid fuel source through a liquid fuel line and a gaseous fuel supplied from a pressurized fuel source through a gaseous fuel line; an alternator driven by the multi-fuel internal combustion engine; and a fuel regulator system comprising: a primary pressure regulator coupled to a service valve of the pressurized fuel source to regulate fuel supplied from the pressurized fuel source to a reduced pressure, and a secondary pressure regulator coupled to the primary pressure regulator to regulate fuel supplied from the primary pressure regulator to a desired pressure for delivery through the gaseous fuel line to operate the engine.

Derivative 12.1: Material & Component Substitution - High-Performance Composites for Regulators and Lines

Enabling Description: The fuel regulator system, including the primary and secondary pressure regulators and the gaseous fuel lines, is constructed using advanced high-performance composite materials. Regulator bodies are fabricated from carbon fiber reinforced polymer (CFRP) with a high-density polyethylene (HDPE) liner for chemical resistance, significantly reducing weight and improving corrosion resistance compared to traditional brass or aluminum. Diaphragms in the regulators are made from advanced elastomers like Perfluoroelastomer (FFKM) for enhanced chemical compatibility and thermal stability across a wider operating range. Gaseous fuel lines are replaced with multi-layer composite hoses (e.g., polyamide inner, aramid fiber braid, polyurethane outer) to tolerate higher pressures and reduce permeation, offering a lighter and more durable alternative to rubber or metal hoses, especially for high-pressure natural gas or hydrogen applications.

Mermaid Diagram:

graph TD
    PFS[Pressurized Fuel Source] -- Service Valve --> PPR[Primary Pressure Regulator (CFRP/FFKM)]
    PPR -- Reduced Pressure Gaseous Fuel --> SPR[Secondary Pressure Regulator (CFRP/FFKM)]
    SPR -- Desired Pressure Gaseous Fuel --> GFL[Composite Gaseous Fuel Line]
    GFL --> Engine[Multi-Fuel ICE]
    LFS[Liquid Fuel Source] --> LFL[Liquid Fuel Line]
    LFL --> Engine
    Engine --> Alt[Alternator]
    Alt --> GenOut[Generator Output]

Derivative 12.2: Operational Parameter Expansion - Cryogenic Fuel System for Extreme Cold Environments

Enabling Description: This derivative adapts the multi-fuel generator and fuel delivery system for operation in extreme cryogenic environments (e.g., Arctic exploration, space applications, or very low-temperature industrial processes). The gaseous fuel source utilizes cryogenically stored fuels like Liquid Natural Gas (LNG) or Liquid Hydrogen (LH2). The fuel regulator system is housed within a cryo-jacketed enclosure, maintaining operating temperatures for components. The primary pressure regulator incorporates a multi-stage expander/vaporizer unit to convert the cryogenic liquid to a gaseous state while simultaneously reducing pressure. The secondary regulator then finely adjusts the warmed gaseous fuel. Fuel lines are vacuum-jacketed (e.g., super-insulated flexible lines) to prevent heat ingress and maintain cryogenic temperatures for the liquid phase before vaporization. All seals, valves, and electrical components are rated for cryogenic service (e.g., using PTFE, Kalrez, and specialized low-temperature alloys).

Mermaid Diagram:

flowchart TD
    CFS[Cryogenic Fuel Source (LNG/LH2)] -- Cryo Line --> SV[Service Valve]
    SV --> CJE[Cryo-Jacketed Enclosure]
    CJE -- Cryo Temp --> MPR[Multi-stage Vaporizer/PPR]
    MPR -- Warmed Gaseous Fuel --> SPR[Secondary Pressure Regulator]
    SPR -- Regulated Gaseous Fuel --> JGFL[Jacketed Gaseous Fuel Line]
    JGFL --> Engine[Multi-Fuel ICE (Cold-Start Optimized)]
    LFS[Liquid Fuel Source (Anti-Freeze Additive)] -- Insulated Line --> Engine
    Engine --> Alt[Alternator]
    Alt --> GenOut[Generator Output]

Derivative 12.3: Cross-Domain Application - Maritime Auxiliary Power Unit (APU)

Enabling Description: This multi-fuel generator system functions as an Auxiliary Power Unit (APU) for maritime vessels, providing electricity while at anchor or for emergency power. The liquid fuel is marine diesel (MGO), and the gaseous fuel is shore-supplied LNG or onboard-generated biogas from waste. The fuel regulator system is designed for a corrosive saltwater environment, with all external components made from marine-grade stainless steel (e.g., 316L) or protected with specialized coatings (e.g., ceramic-epoxy). The primary and secondary regulators are enclosed in explosion-proof housings compliant with maritime safety regulations (e.g., SOLAS, DNV-GL). The fuel lines feature robust anti-corrosion fittings and vibration dampeners suitable for shipboard applications. The entire system is mounted on a shock-absorbing platform to mitigate engine vibrations and ship movements.

Mermaid Diagram:

graph TD
    LFS[Marine Diesel Tank] -- Diesel Line --> Engine[Maritime ICE]
    GFS[LNG/Biogas Source (Shore/Onboard)] -- Gaseous Line --> FRS[Marine-Grade Fuel Regulator System]
    FRS -- Regulated Gas --> Engine
    Engine --> Alt[Ship Alternator]
    Alt --> Switchboard[Vessel Switchboard]
    FRS -- Housing --> EXPH[Explosion-Proof Housing]
    FRS -- Materials --> SS[Stainless Steel 316L]

Derivative 12.4: Integration with Emerging Tech - Decentralized Microgrid Management

Enabling Description: The multi-fuel generator's fuel delivery system is integrated into a decentralized microgrid for optimized energy generation and resource management. The fuel regulator system incorporates smart pressure sensors and flow meters with IoT connectivity, continuously monitoring fuel consumption and remaining capacity for both liquid and gaseous fuels. This data is fed into a microgrid controller that uses AI algorithms to predict demand, optimize fuel mix based on cost and environmental impact (e.g., prioritizing cleaner gaseous fuel during peak hours or when solar/wind generation is low), and trigger automated reordering of fuel. Blockchain is used to record energy generation, fuel transactions, and carbon credits within the microgrid, enabling transparent peer-to-peer energy trading and automated compliance reporting. The generator can autonomously switch fuel types based on microgrid commands.

Mermaid Diagram:

graph TD
    subgraph Multi-Fuel Generator Unit
        Engine[Multi-Fuel ICE] --> Alt[Alternator]
        Alt --> MG_Bus[Microgrid Bus]
        LFS[Liquid Fuel Source] --> LFL[Liquid Fuel Line] --> Engine
        PFS[Pressurized Gaseous Fuel Source] --> FRS_Smart[Smart Fuel Regulator System]
        FRS_Smart --> GFL[Gaseous Fuel Line] --> Engine
    end

    FRS_Smart -- IoT Data (Pressure, Flow, Levels) --> MQTT_Broker[MQTT Broker]
    MQTT_Broker -- Data Stream --> Microgrid_Controller[AI Microgrid Controller]
    Microgrid_Controller -- Commands --> FRS_Smart
    Microgrid_Controller -- Commands --> Engine_ECU[Engine ECU]

    Microgrid_Controller -- Blockchain Transactions --> BC_Ledger[Blockchain Ledger]
    BC_Ledger -- Smart Contracts --> Energy_Trading[Peer-to-Peer Energy Trading]
    Microgrid_Controller -- Predictions --> Auto_Fuel_Order[Automated Fuel Ordering]
    Renewables[Solar/Wind Generation] --> MG_Bus

Derivative 12.5: The "Inverse" or Failure Mode - Limited-Functionality Redundant Regulator

Enabling Description: In this derivative, the fuel regulator system includes a "limited-functionality redundant regulator" (LFRR) designed to provide basic fuel delivery in case of primary and/or secondary regulator failure. The LFRR is a mechanically simpler, spring-loaded diaphragm regulator set to deliver gaseous fuel at a fixed, slightly lower than optimal, but still engine-operable pressure (e.g., 80% of nominal). It bypasses the primary and secondary regulators if a significant pressure drop (below a safe threshold) or complete flow cessation is detected in the main path. The LFRR is constructed with highly durable, passive components to ensure long-term readiness without requiring electrical power for its basic operation. While operating in LFRR mode, the generator might experience reduced power output or slightly higher emissions, but it maintains essential functionality for critical loads, indicated by a "Degraded Mode" signal.

Mermaid Diagram:

graph TD
    PFS[Pressurized Fuel Source] -- Service Valve --> Diverter[Pressure/Flow Diverter Valve]
    Diverter -- Normal Pressure --> PPR[Primary Pressure Regulator]
    PPR --> SPR[Secondary Pressure Regulator]
    SPR -- Regulated Gas --> GFL[Gaseous Fuel Line]
    GFL --> Engine[Multi-Fuel ICE]

    Diverter -- Low Pressure/No Flow Detected --> LFRR[Limited-Functionality Redundant Regulator]
    LFRR -- Fixed Low Pressure Gas --> Bypass_GFL[Bypass Gaseous Fuel Line]
    Bypass_GFL --> Engine

    PPR -- Failure Detected --> Diverter
    SPR -- Failure Detected --> Diverter

    LFRR -- Status Signal --> Controller[System Controller]
    Controller -- "Degraded Mode" Alert --> Operator[Operator Interface]

Derivations from Claim 18

Claim 18: A carburetor for use in a multi-fuel internal combustion engine, the carburetor comprising: a throat in which fuel and air are mixed in throat to provide an air-fuel mixture for the multi-fuel internal combustion engine; a valve located in the throat to provide a choke and throttle for the multi-fuel internal combustion engine; a float bowl to hold liquid fuel; a main fuel circuit positioned downstream from the float bowl and extending from the float bowl to the throat; an idle fuel circuit that provides a flow path to the throat downstream of the throttle to run the engine at idle; and a carburetor cutoff solenoid configured to selectively control fuel flow through the main fuel circuit and the idle fuel circuit.

Derivative 18.1: Material & Component Substitution - Ultrasonic Atomizer & MEMS Valves

Enabling Description: This carburetor derivative replaces conventional fuel metering with an ultrasonic atomization system for liquid fuel and MEMS-based flow control valves for both liquid and gaseous fuels. Instead of a float bowl and conventional jets, liquid fuel is delivered to an ultrasonic atomizer embedded in the throat, which creates a fine mist, improving atomization efficiency. MEMS valves, fabricated from silicon or ceramic, replace the carburetor cutoff solenoid. These microvalves precisely control the flow rate through both the main fuel circuit (now micro-channels) and the idle fuel circuit, offering much finer resolution and faster response times than a mechanical solenoid. The throat itself is constructed from a ceramic composite (e.g., Alumina-SiC matrix) for improved wear resistance, thermal stability, and reduced friction coefficient for airflow.

Mermaid Diagram:

graph TD
    LFS[Liquid Fuel Source] --> MFMC[MEMS Flow Controller - Liquid]
    GFC[Gaseous Fuel Source] --> MFMC_G[MEMS Flow Controller - Gaseous]
    MFMC -- Metered Liquid --> UA[Ultrasonic Atomizer]
    UA --> Throat[Throat (Ceramic Composite)]
    MFMC_G -- Metered Gas --> Throat
    V[Choke & Throttle Valve] --> Throat
    Throat --> Engine[Multi-Fuel ICE]
    Ctrl[Control Unit] -- Signals --> MFMC
    Ctrl -- Signals --> MFMC_G
    Ctrl -- Signals --> V

Derivative 18.2: Operational Parameter Expansion - High-Altitude/Low-Pressure Carburetion

Enabling Description: This carburetor is optimized for multi-fuel engines operating at extreme high altitudes (e.g., 10,000+ ft / 3,000+ meters) where ambient air pressure is significantly reduced. The float bowl is sealed and vented to a pressure compensation chamber that dynamically adjusts to ambient pressure, preventing fuel boiling and maintaining accurate float level. The main and idle fuel circuits feature automatically adjustable jets, controlled by a barometric pressure sensor and a micro-stepper motor, to lean the air-fuel mixture in response to lower air density. The choke mechanism is adapted for higher-altitude starting, potentially with an electronically controlled supplementary air intake to prevent over-rich conditions. The carburetor cutoff solenoid is designed with a vacuum assist mechanism to ensure reliable closure even against reduced intake vacuum.

Mermaid Diagram:

graph TD
    AP_Sens[Barometric Pressure Sensor] --> ECU[Engine Control Unit]
    ECU -- Adjustment Signal --> AJ_Main[Adjustable Jet - Main Fuel]
    ECU -- Adjustment Signal --> AJ_Idle[Adjustable Jet - Idle Fuel]
    LFS[Liquid Fuel Source] --> FB[Sealed Float Bowl with Pressure Comp.]
    FB --> AJ_Main
    FB --> AJ_Idle
    AJ_Main --> Throat[Carburetor Throat]
    AJ_Idle --> Throat
    GFI[Gaseous Fuel Inlet] --> Throat
    V[Choke & Throttle Valve] --> Throat
    Throat --> Engine[Multi-Fuel ICE (High Altitude)]
    ECU -- Control --> CCS[Carburetor Cutoff Solenoid (Vacuum Assist)]
    LFS --> CCS

Derivative 18.3: Cross-Domain Application - Bio-Reactant Mixing for Bioreactors

Enabling Description: The carburetor design is re-purposed as a precision bio-reactant mixing chamber for industrial bioreactors, replacing fuel and air with liquid nutrient solutions and gaseous reagents (e.g., oxygen, CO2, nitrogen). The "throat" becomes the primary mixing zone for precise gas-liquid mass transfer. The "float bowl" holds a primary liquid nutrient, with the "main fuel circuit" and "idle fuel circuit" replaced by controlled microfluidic channels delivering specific liquid additives. The "carburetor cutoff solenoid" is re-engineered as a precision flow control valve for the liquid nutrient and other liquid reactants, enabling rapid and accurate dosing. The "choke and throttle valve" functions as a gas flow regulator and agitator within the mixing chamber, optimizing the dissolution and distribution of gaseous reactants for microbial growth or chemical synthesis.

Mermaid Diagram:

graph TD
    LNR[Liquid Nutrient Reservoir] -- Liquid Nutrient --> FCV_LN[Flow Control Valve - Liquid Nutrient]
    LAR1[Liquid Additive Reservoir 1] -- Liquid Additive 1 --> MFC1[Microfluidic Channel 1]
    LAR2[Liquid Additive Reservoir 2] -- Liquid Additive 2 --> MFC2[Microfluidic Channel 2]

    FCV_LN --> MixingZone[Bioreactor Mixing Zone (Throat)]
    MFC1 --> MixingZone
    MFC2 --> MixingZone

    GRS[Gaseous Reagent Source (O2, CO2)] -- Gaseous Reagent --> GFR[Gas Flow Regulator & Agitator (Choke/Throttle)]
    GFR --> MixingZone

    MixingZone --> Bioreactor[Bioreactor Vessel]
    Controller[Bioreactor Control System] -- Signals --> FCV_LN
    Controller -- Signals --> GFR

Derivative 18.4: Integration with Emerging Tech - Self-Calibrating Smart Carburetor

Enabling Description: This carburetor integrates advanced sensors and an embedded microcontroller for self-calibration and adaptive control. The throat includes wide-band oxygen sensors (lambda sensors), temperature sensors, and pressure transducers. The carburetor cutoff solenoid is replaced by a smart, electronically modulated valve (e.g., a voice coil actuator or stepper motor driven pintle valve) for both main and idle circuits. An embedded AI algorithm (e.g., a PID controller with fuzzy logic or neural network adaptation) continuously analyzes real-time sensor data from the exhaust and intake, adjusting fuel metering for optimal combustion efficiency, emissions compliance, and power output, adapting to varying fuel quality or engine wear. This eliminates the need for manual jet changes. Firmware updates for fuel maps can be delivered via wireless IoT connectivity.

Mermaid Diagram:

graph TD
    LFS[Liquid Fuel Source] --> EMV_L[Electronically Modulated Valve - Liquid]
    GFI[Gaseous Fuel Inlet] --> Throat[Smart Carburetor Throat]
    EMV_L --> Throat

    Throat --> V[Choke & Throttle Valve]
    V --> Engine[Multi-Fuel ICE]

    Sensors[O2, Temp, Pressure Sensors] --> Microcontroller[Embedded Microcontroller with AI Algo]
    Microcontroller -- Adaptive Control Signals --> EMV_L
    Microcontroller -- Adaptive Control Signals --> V
    Microcontroller -- Telemetry/Updates --> IoT_Gateway[IoT Gateway (Wireless)]
    IoT_Gateway --> Cloud[Cloud Analytics/Firmware Updates]

Derivative 18.5: The "Inverse" or Failure Mode - Minimal-Flow Safety Carburetor

Enabling Description: This carburetor is designed with a "minimal-flow safety mode" activated upon detection of critical faults (e.g., a stuck-open main fuel valve, severe engine overspeed, or catastrophic sensor failure). The carburetor cutoff solenoid (or an integrated safety valve) is specifically designed with a redundant, passive mechanism (e.g., a calibrated orifice plate or a pressure-activated diaphragm) that, when the main solenoid fails or power is lost, allows only a severely restricted, "limp-home" flow rate of liquid fuel. This minimal flow is sufficient to keep the engine barely running at a very low RPM for a limited time (e.g., to move the generator out of a dangerous area) but prevents high power output or runaway conditions. The idle fuel circuit is either completely shut off in this mode or also restricted to a bare minimum. Gaseous fuel is entirely shut off by its dedicated (and separate) solenoid in this failure state.

Mermaid Diagram:

stateDiagram-v2
    [*] --> Normal_Operation : Carburetor Init
    Normal_Operation --> Fault_Detected : Critical Fault Occurs
    Fault_Detected --> Minimal_Flow_Safety_Mode : Activate Safety Protocol

    state Normal_Operation {
        CCS_Control: Carburetor Cutoff Solenoid (Main & Idle Control)
        Full_Fuel_Flow: Main & Idle Circuits Active
    }

    state Minimal_Flow_Safety_Mode {
        CCS_Fail_Safe: Carburetor Cutoff Solenoid (Redundant/Passive)
        Restricted_Liquid_Flow: Calibrated Orifice / Low Flow Diaphragm
        Gaseous_Fuel_OFF: Gaseous Fuel Solenoid Closed
        Engine_Limp_Home: Engine operates at minimal RPM
    }

    Minimal_Flow_Safety_Mode --> Shutdown : Manual Shutdown / Fuel Depletion
    Shutdown --> [*]

Combination Prior Art Scenarios

Here are at least 3 "Combination Prior Art" scenarios where US11143120 is combined with existing open-source standards to demonstrate obviousness or non-novelty for future incremental improvements.

US11143120 + SAE J1939 (CAN Bus Standard for Commercial Vehicles)
- Description: The integration of the multi-fuel engine's fuel management system (specifically the control of solenoids and timing circuits of Claim 1, and the fuel regulator system of Claim 12) with the SAE J1939 standard for Controller Area Network (CAN) bus in commercial vehicle applications. J1939 defines communication protocols for data exchange among ECUs, including engine parameters, fuel levels, and diagnostic trouble codes. A person skilled in the art would find it obvious to implement the switch and timing circuits (Claim 1) as J1939-compliant ECUs, allowing fuel selection and timing parameters to be transmitted and received over the vehicle's existing CAN bus. This would enable the engine to seamlessly integrate into vehicle diagnostics, telematics, and fleet management systems, where fuel type could be selected or optimized by a central vehicle controller based on factors like route, payload, or fuel availability, using standardized J1939 messages (e.g., requesting fuel mode change, reporting current fuel status). The remote regulator system (Claim 12) could also report its status and pressure readings via J1939, for instance, reporting the primary and secondary regulator pressures.
- Obviousness Argument: For any multi-fuel engine in a commercial vehicle context, the use of existing vehicle communication standards like J1939 for command and control of critical engine components, such as fuel selection and timing, would be a matter of routine engineering design to achieve interoperability and leverage established diagnostic capabilities. This combination allows for a sophisticated multi-fuel generator management without complex bespoke wiring, leveraging the existing digital backbone.
US11143120 + Modbus TCP (Industrial Communication Protocol)
- Description: The multi-fuel generator's fuel delivery system (as described in Claim 12) and the carburetor's control mechanisms (Claim 18) are integrated into an industrial automation or SCADA (Supervisory Control and Data Acquisition) system using Modbus TCP. The fuel regulator system (primary and secondary regulators) would include Modbus TCP/IP-enabled sensors for real-time pressure, temperature, and flow rate monitoring of the gaseous fuel path. The carburetor cutoff solenoid (Claim 18) and other fuel solenoids (Claim 1) would be controlled via Modbus TCP commands from a Programmable Logic Controller (PLC) or Distributed Control System (DCS). This allows for remote monitoring, diagnostics, and control of the multi-fuel generator within an industrial plant or power generation facility, enabling automated fuel switching, performance tuning, and alarm management based on plant-wide operational strategies.
- Obviousness Argument: In industrial settings, the control and monitoring of generators and their subsystems (like fuel delivery) via widely adopted open standards such as Modbus TCP is commonplace. Extending this to a multi-fuel system, where different fuel sources need selective control and monitoring, would be a straightforward application of existing industrial communication and control principles. Integrating carburetor-specific cutoff solenoids into this framework simply provides granular control over the fuel flow as part of a larger automated system.
US11143120 + MQTT (Message Queuing Telemetry Transport) for Remote Monitoring
- Description: The multi-fuel engine (Claim 1) and generator (Claim 12) system are equipped with IoT sensors to monitor fuel levels, engine status, and operational parameters (RPM, load, output voltage). This data is transmitted using the lightweight MQTT protocol over cellular or satellite networks to a remote cloud-based monitoring platform. The switch and timing circuits (Claim 1) can receive MQTT messages for remote commands (e.g., "switch to LPG," "initiate liquid fuel prime"). The fuel regulator system (Claim 12) provides its pressure readings as MQTT topics. This enables global fleet management of multi-fuel generators, predictive maintenance, and remote diagnostics, particularly useful for generators deployed in remote locations for telecommunications towers, construction sites, or off-grid power.
- Obviousness Argument: Given the prevalence of IoT and remote monitoring in modern industrial and consumer equipment, the application of a lightweight messaging protocol like MQTT for status reporting and remote command-and-control of a multi-fuel engine or generator system would be a clear and obvious engineering choice. The features of US11143120 (precise fuel switching, multiple fuel sources) directly benefit from such a remote monitoring and control paradigm to maximize uptime and efficiency in distributed deployments.