Generator fuel supply monitoring and catalyst protection device

Abstract

This invention belongs to the field of generator technology, specifically a generator fuel supply monitoring and catalytic converter protection device. It includes a non-contact current sensor installed at the generator output end; a resonant pressure sensor embedded in the high-pressure fuel line; a control module integrating a dynamic threshold calculation model; an electromagnetic shut-off valve and an electronic fuel injection ECU electrically connected to the control module. The non-contact current sensor is a ring Hall sensor, fixed to the periphery of the wire at the generator output end. The resonant pressure sensor is a MEMS piezoresistive sensor, embedded in the wall of the high-pressure fuel line and sealed to the line with threaded fasteners. This invention optimizes the physical installation structure of the current and pressure sensors, combining a solenoid valve and an ECU dual-actuation module to achieve rapid diagnosis and shut-off of abnormal fuel supply. The device has a compact structure and rapid response, effectively preventing catalytic converter core melting due to afterburning. It is suitable for various internal combustion engine generator sets.

Description

Technical Field

[0001] This utility model relates to the field of generator technology, and in particular to a generator fuel supply monitoring and catalyst protection device. Background Technology

[0002] In existing technologies, engine misfire prevention systems mostly rely on a single sensor (such as a temperature or pressure sensor) for threshold determination, which has the following structural defects:

[0003] 1. Simple sensor layout: Only pressure, temperature or current sensors are configured, making it impossible to achieve multi-parameter coupling analysis through physical structure;

[0004] 2. Control module response delay: The hardware circuit design of traditional control modules results in a long signal processing cycle (>50ms). Utility Model Content

[0005] The purpose of this invention is to improve the hardware architecture to achieve rapid fuel cut-off and prevent the catalyst core from melting due to misfire and afterburning, thus proposing a generator fuel supply monitoring and catalyst protection device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A generator fuel supply monitoring and catalytic converter protection device includes a non-contact current sensor installed at the generator output terminal, and a wire is provided at the generator output terminal;

[0008] Resonant pressure sensor embedded in high-pressure fuel line;

[0009] A control module that integrates a dynamic threshold calculation model;

[0010] The electromagnetic shut-off valve and the electronic fuel injection ECU are electrically connected to the control module.

[0011] As a preferred embodiment of this utility model, the non-contact current sensor is a ring Hall sensor, model number: HASS-2000, which is fixed around the wire at the generator output end, and the distance between the sensor and the wire is ≤3mm.

[0012] As a preferred embodiment of this utility model, the resonant pressure sensor is a MEMS piezoresistive sensor with a range of 0-1MPa, which is embedded in the wall of the high-pressure fuel line and sealed to the line by threaded fasteners.

[0013] In a preferred embodiment of this invention, the control module includes a dual-core control module unit and a signal processing circuit.

[0014] As a preferred embodiment of this utility model, the signal processing circuit includes a current-to-voltage conversion module (accuracy ±0.5%) and a pressure signal filtering circuit (cutoff frequency 10kHz) connected in parallel.

[0015] As a preferred embodiment of this utility model, the dual-core control module unit includes a main control chip, an integrated FPGA coprocessor, and a 0.1-level interrupt response circuit, wherein the main control chip is an STM32H743.

[0016] As a preferred embodiment of this utility model, the electromagnetic shut-off valve is a direct-acting electromagnetic valve with a response time of <5ms, connected in series with the high-pressure fuel line, and the valve body is connected to the line by a clamp.

[0017] This invention optimizes the physical installation structure of the current sensor and pressure sensor, and combines a solenoid valve and an ECU dual-actuation module to achieve rapid diagnosis and cut-off of fuel supply anomalies. The device has a compact structure and a rapid response, and can effectively prevent the catalyst core from melting due to afterburning. It is suitable for various internal combustion engine generator sets. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the generator fuel supply monitoring and catalyst protection device proposed in this utility model.

[0019] In the diagram: 1. Non-contact current sensor; 2. Wire; 3. Resonant pressure sensor; 4. High-pressure fuel line; 5. Electromagnetic shut-off valve; 6. Control module; 7. Electronic fuel injection ECU. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0021] Reference Figure 1 The generator fuel supply monitoring and catalyst protection device includes a non-contact current sensor 1 installed at the generator output terminal, and a wire 2 is provided at the generator output terminal;

[0022] A resonant pressure sensor 3 embedded in the high-pressure fuel line 4;

[0023] Control module 6, which integrates a dynamic threshold calculation model;

[0024] The electromagnetic shut-off valve 5 and the electronic fuel injection ECU 7 are electrically connected to the control module 6.

[0025] The non-contact current sensor 1 is a ring Hall sensor, model: HASS-2000, which is fixed around the wire 2 at the generator output end, and the distance between the sensor and the wire 2 is ≤3mm.

[0026] The resonant pressure sensor 3 is a MEMS piezoresistive sensor with a range of 0-1MPa. It is embedded in the wall of the high-pressure fuel line 4 and sealed to the line via threaded fasteners.

[0027] The control module 6 includes a dual-core control module unit and a signal processing circuit.

[0028] The signal processing circuit includes a current-to-voltage conversion module (accuracy ±0.5%) and a pressure signal filtering circuit (cutoff frequency 10kHz) connected in parallel.

[0029] The dual-core control module unit includes a main control chip, an integrated FPGA coprocessor, and a 0.1-level interrupt response circuit. The main control chip is an STM32H743.

[0030] The electromagnetic shut-off valve 5 is a direct-acting electromagnetic valve with a response time of <5ms. It is connected in series with the high-pressure fuel line 4, and the valve body is connected to the line by a clamp.

[0031] The working process of this utility model:

[0032] The non-contact current sensor 1 is fitted onto the generator output wire 2, ensuring a 2.5mm gap between the inner wall of the annular Hall sensor and the wire 2. The resonant pressure sensor 3 is embedded in the high-pressure fuel line 4 through an M12×1 threaded interface. The sealing gasket is made of fluororubber. The control module 6 is mounted on the engine anti-vibration bracket. The signal line is a twisted pair shielded cable (shielding layer grounding resistance ≤4Ω). The non-contact current sensor 1 and the resonant pressure sensor 3 synchronously acquire signals and transmit them to the control module via the shielded cable. The FPGA coprocessor calculates ΔI / Δt and ΔP / Δt in real time and generates a protection threshold. When ΔI / Δt > 10A / ms (set according to the generator's power output) and P < 200KPa (set according to the generator's electronic fuel injection pressure), the control module 6 outputs a 12V pulse signal to drive the electromagnetic shut-off valve 5 to close. At the same time, it sends a signal to the electronic fuel injection ECU 7 to shut off the fuel supply enable switch. Meanwhile, the electronic fuel injection ECU 7 continues to ignite 3 times.

[0033] This technical solution has been verified through testing:

[0034] 1. Improved response speed: The closing time of the electromagnetic shut-off valve 5 has been reduced from the traditional 50ms to 4.8ms (actual measurement data);

[0035] 2. The accuracy rate of fire early warning has been improved to 99.3%;

[0036] 3. The catalytic converter over-temperature protection response time has been shortened to 80ms;

[0037] 4. The false cut rate has been reduced to below 2.1%.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A generator fuel supply monitoring and catalyst protection device, characterized by, This includes a non-contact current sensor installed at the generator output, with wires provided at the generator output. Resonant pressure sensor embedded in high-pressure fuel line; A control module that integrates a dynamic threshold calculation model; The electromagnetic shut-off valve and the electronic fuel injection ECU are electrically connected to the control module.

2. The generator fuel supply monitoring and catalyst protection apparatus according to claim 1, characterized by, The non-contact current sensor is a ring Hall sensor, model: HASS-2000, which is fixed around the wire at the generator output end, with a spacing of ≤3mm between it and the wire.

3. The generator fuel supply monitoring and catalytic converter protection device according to claim 1, characterized in that, The resonant pressure sensor is a MEMS piezoresistive sensor with a range of 0-1MPa. It is embedded in the wall of the high-pressure fuel line and sealed to the line via threaded fasteners.

4. The generator fuel supply monitoring and catalytic converter protection device according to claim 1, characterized in that, The control module includes a dual-core control module unit and a signal processing circuit.

5. The generator fuel supply monitoring and catalytic converter protection device according to claim 4, characterized in that, The signal processing circuit includes a current-to-voltage conversion module and a pressure signal filtering circuit connected in parallel.

6. The generator fuel supply monitoring and catalytic converter protection device according to claim 4, characterized in that, The dual-core control module unit includes a main control chip, an integrated FPGA coprocessor, and a 0.1-level interrupt response circuit. The main control chip is an STM32H743.

7. The generator fuel supply monitoring and catalytic converter protection device according to claim 1, characterized in that, The electromagnetic shut-off valve is a direct-acting electromagnetic valve with a response time of <5ms. It is connected in series with the high-pressure fuel line, and the valve body is connected to the line by a clamp.

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