Intelligent diesel filtering controller

Abstract

The invention discloses an intelligent diesel oil filtering controller which comprises an MCU module which is responsible for signal receiving and overall control; the anti-reverse connection module realizes reverse connection protection through the switching characteristic of an MOS tube, and improves the power supply quality and the circuit stability through a TVS tube and a filter capacitor; the 5V high-side switch module can accurately control the on-off of a 5V direct-current load, processes a control signal through a resistance network, and ensures the stability of high-side switch control; the DC-DC module is used for converting the input direct-current voltage into different output direct-current voltages so as to realize flexible management of electric energy distribution; two drainage modes including automatic drainage and manual drainage are provided, whether the water tank is blocked or leaks water or not is detected at the same time, two filter element blocking detection modes, a pressure mode and a pressure difference mode are provided, a user can adjust a water level alarm threshold value, a drainage trigger threshold value and a pressure difference early warning threshold value through a remote terminal according to the vehicle type and the operation environment, and the water level alarm threshold value is adjusted. And different scene requirements can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel filter control, in particular to an intelligent diesel filter controller. BACKGROUND

[0002] In the diesel engine fuel supply system, the fuel filter system is the core link to ensure the reliable operation of the engine, and the diesel filter controller (hereinafter referred to as "diesel filter controller") as the control center of the system, its function implementation directly affects the filtering efficiency and engine operating stability. The core function of the diesel filter controller focuses on three dimensions: first, the drainage device control, that is, the free water separated from the diesel oil is effectively drained to avoid system failure caused by water retention; second, the filter element state monitoring, which captures the performance degradation of the filter element caused by impurity deposition in real time; third, the fault warning, which warns in advance of potential problems such as drainage abnormality and filter element blockage through monitoring of key parameters.

[0003] During the mining, refining, storage and filling process of diesel oil, free water and solid impurities are easily mixed in. Among them, if the free water is retained in the filter system for a long time, on the one hand, it will accelerate the hydration aging of the filter fiber, leading to filter element blockage; on the other hand, it will breed anaerobic microorganisms on the surface of the filter element and in the filter housing, and the metabolic products will accelerate the corrosion of metal parts; more seriously, if the retained water enters the fuel injection system, it will cause the "cavitation" phenomenon of the engine, leading to a sharp drop in injection pressure, and in extreme cases, it will cause the engine to stall. At the same time, during the long-term operation of the fuel filter, the filter element will form filter cake due to the deposition of solid impurities, causing the pressure difference between the inlet and outlet of the filter element to gradually increase, which will cause insufficient oil supply, and further lead to engine power decline, poor fuel atomization, and high fuel consumption. Ignoring it for a long time will shorten the service life of the engine.

[0004] The existing technology mainly falls into two categories:

[0005] Traditional mechanical diesel filter management system: relies on manual operation to realize drainage and filter element maintenance, such as manually unscrewing the drain valve after judging the water level through the transparent observation window, and the filter element maintenance is based on fixed period replacement without real-time state monitoring function;

[0006] Primary intelligent diesel filter controller: integrates a single water level sensor and a differential pressure sensor, which can realize water level overrun alarm or differential pressure overrun alarm, but the drainage function only supports single automatic drainage (such as automatic drainage through electromagnetic valve) or single manual drainage, and the filter element maintenance strategy is still based on fixed period.

[0007] In the prior art, the drainage function only supports single manual drainage or single automatic drainage: manual drainage needs to rely on regular manual inspection, and there is a risk of "missed inspection" and "misjudgment", especially in the high-frequency operation scenario of commercial vehicles (such as trucks and engineering machinery), manual inspection cannot follow the water level change in real time, and water retention may be excessive. The existing automatic drainage module does not integrate fault detection functions such as "drainage blockage" and "drainage valve leakage", and if the drainage valve is blocked by impurities, the drainage is not smooth, or if the seal is aged, the system cannot timely alarm, the former will aggravate the water retention problem, and the latter will cause diesel leakage, which has safety hazards. The existing filter maintenance is based on a fixed period (such as according to the driving mileage or running time), and is not related to the real-time blockage state of the filter: on the one hand, if the diesel quality is good, replacing the filter according to the fixed period will cause waste of filter resources and increase the user's maintenance cost; on the other hand, if the diesel quality is poor or the running environment is harsh, the filter is seriously blocked before the fixed period, which will cause the oil supply pressure to be out of standard, and cause the engine power to decrease, the fuel consumption to increase, and even the high-pressure oil pump to be damaged.

[0008] Therefore, an intelligent diesel filtration controller is provided. SUMMARY

[0009] The purpose of the present application is to provide an intelligent diesel filtration controller to solve the problems raised in the background art.

[0010] To achieve the above purpose, the present application provides the following technical solution: an intelligent diesel filtration controller, comprising:

[0011] The MCU module is responsible for receiving signals and overall control;

[0012] The anti-reverse connection module realizes reverse connection protection through the switching characteristics of the MOS tube, and improves the power quality and circuit stability through the TVS tube and the filter capacitor;

[0013] The 5V high-side switch module can accurately control the on-off of the 5V direct current load, and processes the control signal through a resistor network to ensure the stability of the high-side switch control;

[0014] The DC-DC module converts the input direct current voltage into different output direct current voltages to flexibly manage the distribution of electric energy;

[0015] The LDO module converts high voltage stability into low voltage output to ensure the stability and reliability of the output voltage;

[0016] The 24V high-side switch module can support 2A inductive load current and can drive multiple inductive loads or large current inductive loads, effectively suppressing the reverse electromotive force of the inductive load during power-off, and protecting the high-side switch device;

[0017] The CAN module realizes high-reliability data transmission;

[0018] The indicator light module realizes accurate on-off control of the indicator light.

[0019] The input signal module realizes electrical isolation of the external vehicle body state signal and the internal circuit, can effectively resist the influence of external electromagnetic interference and surge on the circuit, and ensures the accuracy of vehicle body state signal transmission.

[0020] The pressure sensor module realizes monitoring of the pressure.

[0021] The water level sensor module realizes monitoring of the water level.

[0022] The power voltage and output collection module reduces the higher power or electromagnetic valve output voltage to a voltage range suitable for the collection port by means of resistance division, facilitating voltage monitoring by the subsequent circuit MCU.

[0023] Preferably, the MCU module comprises a single-chip microcomputer U3, the 4-pin of the single-chip microcomputer U3 is connected to the V_3V3 end, the 5-pin is connected to the ground, the V_3V3 end is connected with the GND through a capacitor C7, one end of the capacitor C7 is connected with a resistor R9 and a capacitor C8, and the 9-pin of the single-chip microcomputer U3 is connected with a resistor R38 and a switch SW1 and grounded.

[0024] Preferably, the anti-reverse connection module comprises a diode D5, the two ends of the diode D5 are respectively connected with an EXT_V_24V end and an EXT_GND end, the EXT_V_24V end and the EXT_GND end are further connected with a capacitor C2, a capacitor C3 and a resistor R5, the other end of the resistor R5 is connected with a node T1, a triode Q1, a diode ZD1 and a capacitor C6, and the EXT_V_24V end and the GND end are connected with a capacitor C4 and a capacitor C5.

[0025] Preferably, the 5V high-side switch module comprises a chip U7 and a chip U12, the 3-pin of the chip U7 is connected with a resistor R12, a resistor R30 and a node T22 and connected to the 27-pin of the single-chip microcomputer U3, the 2-pin of the chip U7 is grounded, the 4-pin of the chip U7 is connected with a capacitor C21 and a capacitor C20 and connected with a V_5V end, and the 1-pin of the chip U7 is connected with a capacitor C22 and a node T25 and connected with an EXT_5VDC_OUT1 end.

[0026] The 3-pin of the chip U12 is connected with a resistor R44, a resistor R47 and a node T38 and connected to the 28-pin of the single-chip microcomputer U3, the 2-pin of the chip U12 is grounded, the 4-pin of the chip U12 is connected with a capacitor C29 and a capacitor C25 and connected to the V_5V end, and the 1-pin of the chip U12 is connected with a capacitor C30 and a node T17 and connected with an EXT_5VDC_OUT2 end.

[0027] Preferably, the DC-DC module comprises a chip U5, the 2nd and 3rd pins of the chip U5 are connected with a capacitor C11 between the 1st pin, the 2nd pin of the chip U5 is connected with a node T7 and an EXT_V_24V terminal, the 4th pin of the chip U5 is connected with a node T8, a resistor R28 and grounded, the 8th pin of the chip U5 is connected with a node T5, an inductor L2, a node T4, a capacitor C32 and a capacitor C14, the 7th pin of the chip U5 is connected with a capacitor C12 and connected to the node T5, the 6th pin of the chip U5 is connected with a node T6 and a capacitor C15, the 5th pin of the chip U5 is connected with a node T9, a resistor R24 and a resistor R6 between the 8th pin.

[0028] The LDO module comprises a chip U8, the 1st pin of the chip U8 is connected with a capacitor C34 and a capacitor C35, the 5th pin of the chip U8 is connected with a capacitor C27 and a capacitor C26.

[0029] Preferably, the 24V high-side switch module comprises a chip U2 and a chip U4, the 2nd pin of the chip U2 is connected with a node T19, a resistor R1 and a resistor R27 and connected to the 23rd pin of a single-chip microcomputer U3, the 3rd pin of the chip U2 is connected with a node T20 and a diode D1, the 2nd pin of the chip U4 is connected with a node T23, a resistor R4 and a resistor R31 and connected to the 22nd pin of the single-chip microcomputer U3, the 3rd pin of the chip U4 is connected with a node T26 and a diode D2, the 5th, 6th, 7th and 8th pins of the chip U2 and the chip U4 are connected and connected with a capacitor C18 and a capacitor C9.

[0030] Preferably, the indicator light module comprises a chip U9 and a chip U10, the 1st pin of the chip U9 is connected with a resistor R34, a node T37 and a resistor R19 and connected to the 19th pin of the single-chip microcomputer U3, the 2nd pin of the chip U9 is connected with an EXT_Lamp terminal, the 3rd and 4th pins of the chip U9 are connected and grounded.

[0031] The 1st pin of the chip U10 is connected with a resistor R33, a node T36 and a resistor R39 and connected to the 20th pin of the single-chip microcomputer U3, the 2nd pin of the chip U10 is connected with an EXT_PSO terminal, the 3rd and 4th pins of the chip U10 are connected and grounded.

[0032] Preferably, the input signal module comprises a chip U6 and a chip U11, the 1st pin of the chip U6 is connected with a node T29, a resistor R14, a node T28, a diode D3 and an EXT_DSgn terminal, the 2nd pin of the chip U6 is connected with a resistor R15 and connected to the node T28, the 4th pin of the chip U6 is connected with a capacitor C23, the 3rd pin of the chip U6 is connected with a resistor R17, a node T33, a capacitor C24 and a resistor R16 and connected to the 30th pin of the single-chip microcomputer U3.

[0033] The 1-pin of the chip U11 is connected with the ground T35, the resistance R18, the node T34, the diode D4 and the EXT_SSgn end, the 2-pin of the chip U11 is connected with the resistance R20 and is connected to the node T34, the 4-pin of the chip U11 is connected with the capacitor C28, and the 3-pin of the chip U11 is connected with the resistance R26, the node T39, the capacitor C36 and the resistance R23 and is connected to the 29-pin of the single-chip microcomputer U3.

[0034] Preferably, the pressure sensor module comprises a voltage stabilizing tube ZD4 and a voltage stabilizing tube ZD2, one end of the voltage stabilizing tube ZD4 is connected with the capacitor C13, the node T42, the resistance R13, the resistance R10 and is connected with the EXT_PSI1 end, one end of the voltage stabilizing tube ZD2 is connected with the capacitor C17, the node T41, the resistance R25, the resistance R11 and is connected with the EXT_PSI2 end.

[0035] The water level sensor module comprises a voltage stabilizing tube ZD3 and a voltage stabilizing tube ZD5, one end of the voltage stabilizing tube ZD3 is connected with the capacitor C16, the node T31, the resistance R7, the resistance R29 and is connected with the EXT_WHS end, one end of the voltage stabilizing tube ZD5 is connected with the capacitor C19, the node T30, the resistance R8, the resistance R32 and is connected with the EXT_WLS end.

[0036] Preferably, the power supply voltage and output acquisition module comprises a voltage stabilizing tube ZD6, a voltage stabilizing tube ZD7 and a voltage stabilizing tube ZD8, one end of the voltage stabilizing tube ZD6 is connected with the capacitor C37, the node T24, the resistance R42 and the resistance R22, one end of the voltage stabilizing tube ZD7 is connected with the capacitor C38, the node T40, the resistance R40 and the resistance R45, and one end of the voltage stabilizing tube ZD8 is connected with the capacitor C10, the node T15, the resistance R21 and the resistance R41.

[0037] Compared with the prior art, the beneficial effects of the present application are: two drainage modes are provided, automatic drainage and manual drainage, whether the water tank is blocked or water leakage is detected, two filter core blockage detection modes are provided, pressure mode and differential pressure mode, users can adjust the water level alarm threshold, the drainage trigger threshold and the differential pressure early warning threshold through a remote terminal according to the vehicle type and the running environment, and different scene requirements are adapted. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is the circuit diagram of the MCU module of the present application;

[0039] Figure 2 It is the circuit diagram of the anti-reverse connection module of the present application;

[0040] Figure 3 It is the circuit diagram of the 5V high-side switch module of the present application;

[0041] Figure 4 This is a circuit diagram of the DC-DC module of the present invention;

[0042] Figure 5 This is a circuit diagram of the LDO module of the present invention;

[0043] Figure 6 This is a circuit diagram of the 24V high-side switch module of the present invention;

[0044] Figure 7 This is a circuit diagram of the CAN module of the present invention;

[0045] Figure 8 This is a circuit diagram of the indicator light module of the present invention;

[0046] Figure 9 This is a circuit diagram of the input signal module of the present invention;

[0047] Figure 10 This is a circuit diagram of the pressure sensor module of the present invention;

[0048] Figure 11 This is a circuit diagram of the water level sensor module of the present invention;

[0049] Figure 12 This is a circuit diagram of the power supply voltage and output acquisition module of the present invention. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0051] Please see Figures 1-12 The present invention provides a technical solution: such as Figure 1 The MCU module shown includes a microcontroller U3. Pin 4 is connected to V_3V3, and pin 5 is grounded. Capacitor C7 is connected between V_3V3 and GND. One end of capacitor C7 is connected to V_3V3 via resistor R9, and the other end is grounded. SW1 is grounded at one end, and the other end is connected to pin 9 of U3 via resistor R38.

[0052] like Figure 2 The reverse connection protection module shown has diode D5 connected between EXT_V_24V and EXT_GND. Capacitors C2 and C3 are also connected in parallel between EXT_V_24V and EXT_GND. One end of resistor R5 is connected to EXT_V_24V, and the other end is connected to the circuit composed of Q1, ZD1, etc., via node T1. This part of the circuit also includes capacitor C6. Capacitors C4 and C5 are connected in parallel between EXT_V_24V and GND, serving as filters and energy storage.

[0053] Anti-reverse connection protection module, the circuit is a set of anti-reverse connection, surge protection, power filter in one of the 24V power input module, through the switching characteristics of MOS tube to achieve anti-reverse connection, while through the TVS tube and filter capacitor to improve the quality of power supply and circuit stability.

[0054] As Figure 3 5V high side switch module, the module DO_EN1 through the resistance R12, connected to the IN pin of U7; at the same time, the node also through the resistance R30 ground. U7 power supply end connection V_5V, V_5V and GND between the parallel capacitor C21 and C20, play a filtering effect; U7 OUT pin output EXT_5VDC_OUT1, output end parallel capacitor C22. DO_EN2 through the resistance R44, connected to the IN pin of U12; at the same time, the node through the resistance R47 ground. U12 power supply end connection V_5V, V_5V and GND between the parallel capacitor C29 and C25, for filtering; U12 OUT pin output EXT_5VDC_OUT2, output end parallel capacitor C30. DO_EN1 and MCU module in U3 single chip microcomputer PIN27 pin connected, DO_EN2 and MCU module in U3 single chip microcomputer PIN28 pin connected.

[0055] 5V high side switch module, can accurately control 5V DC load on-off, over resistance network to control signal processing, to ensure the stability of high side switch control, effectively avoid the occurrence of false trigger. The design of multi-capacitor, whether it is power supply end or load output end, can effectively filter out interference, provide stable 5V working voltage for the load. When U7, U12 detects short circuit, will actively close, to achieve protection.

[0056] As Figure 4 DC-DC module, the module EXT_V_24V for input voltage, capacitor C11 connected between EXT_V_24V and GND, play a filtering effect; resistance R28 one end of U5 pin 4, the other end of the ground. U5 VIN pin 2 of EXT_V_24V, GND pin 1 ground, EN / EN pin 3 of EXT_V_24V, RRON pin 4 ground. SW pin connection capacitor C12 and other components, C12 the other end of PIN7 foot BST, through the inductance L2 and other components of the circuit, output V_5V; capacitor C15, C32, C14 and other components connected between V_5V and GND, for filtering; resistance R6, R24 constitute a voltage divider circuit, connected with FB pin.

[0057] As Figure 5The LDO module shown is included in this circuit, with V_5V as the input power supply. Capacitors C34 and C35 are both connected between V_5V and GND, serving as filters. Pin 1 of U8's IN pin is connected to V_5V, and pin 2 of GND is grounded. Pin 5 of U8 outputs V_3V3. Capacitors C27 and C26 are connected between V_3V3 and GND to filter the output V_3V3.

[0058] like Figure 6 The 24V high-side switch module shown includes EXT_V_24V as the power supply terminal, and C18 and C9 for filtering, connected between EXT_V_24V and GND respectively. For the branch consisting of U2, its GND pin is grounded, and its VBB pin is connected to EXT_V_24V. DO_IN0 is connected to the IN pin of U2 via resistor R1, and this node is also grounded via resistor R27. The OUT pin of U2 outputs EXT_HSD1, and a diode D1 is connected in parallel to this output, with the other end of diode D1 grounded. DO_IN0 is connected to PIN23 of the U3 microcontroller in the MCU module. For the other branch, U4, its GND pin is grounded, and its VBB pin is connected to EXT_V_24V. DO_IN1 is connected to the IN pin of U4 via resistor R4, and this node is also grounded via resistor R31. The OUT pin of U4 outputs EXT_HSD2, and a diode D2 is connected in parallel to this output, with the other end of diode D2 grounded. DO_IN1 is connected to PIN22 of the U3 microcontroller in the MCU module.

[0059] This 24V high-side switching module supports 2A of inductive load current and can drive multiple inductive loads or high-current inductive loads. The addition of a freewheeling diode effectively suppresses the reverse electromotive force when the inductive load is turned off, protecting the high-side switching devices and making the circuit more reliable in inductive load scenarios. With a standby current of only 10μA, it achieves low power consumption while fulfilling its driving function. When U2 and U4 detect a short circuit, they will actively shut down for protection.

[0060] like Figure 7In the shown CAN module, the module EXT CANL, EXT CANH signal first through the resistance R48, and then access to the common mode inductor L1 pin 2, 3; common mode inductor L1 pin 1, 4 are connected to the CAN transceiver U1 CANL, CANH pin; U1 VCC pin V_5V, and through the capacitor C1 ground, GND pin ground; U1 RXD pin through the resistance R2 connected to DI_CAN_RX, TXD pin through the resistance R3 connected to DO_CAN_TX; at the same time, V_3V3 through the resistance R50, on the one hand connected to the U1 NC pin, the other hand through the capacitor C31 ground. DI_CAN_RX and MCU module U3 microcontroller PIN15 pin connected, DI_CAN_TX and MCU module U3 microcontroller PIN1 pin connected.

[0061] As Figure 8 shown in the light module, the water level state indicator branch, DO_LAMP1 signal through the resistance R19 connected R34 and low side switch U9 IN pin, R34 one end ground; low side switch U9 D pin and EXT_Lamp connected, S pin, TAB pin ground. State alarm indicator branch, DO_LAMP2 signal through the resistance R39 connected R33 and low side switch U10 IN pin, R33 one end ground; low side switch U10 D pin and EXT_PSO connected, S pin, TAB pin ground. DO_LAMP1 and MCU module U3 microcontroller PIN19 pin connected, DO_LAMP2 and MCU module U3 microcontroller PIN20 pin connected.

[0062] In the light module, the application of low side switch can realize the accurate on-off control of the indicator light, and at the same time, this kind of independent driving mode can make two indicator lights correspond to different states (water level state, state alarm), and the current limiting and voltage dividing design of the resistance network can adapt the working parameters according to the characteristics of the indicator light, which can protect the indicator light and ensure the stability of the whole indicator circuit.

[0063] As Figure 9In the input signal module shown, the first input signal terminal EXT_DSgn is connected to pin 1 of optocoupler U6 via diode D3 and resistor R14. EXT_DSgn is also grounded via R15. The second input signal terminal EXT_SSgn is connected to pin 1 of optocoupler U11 via diode D4 and resistor R18. EXT_SSgn is also grounded via R20. Pin 3 of optocoupler U6 is grounded via R17 and connected to pin 30 of microcontroller U3 in the MCU module via R16. V_3V3 is connected to pin 4 of optocoupler U6 and C23, with the other end of C23 grounded. Pin 3 of optocoupler U11 is grounded via R26 and connected to pin 29 of microcontroller U3 in the MCU module via R23. V_3V3 is connected to pin 4 of optocoupler U6 and C28, with the other end of C28 grounded. C24 is connected in parallel across R17 and grounded, and C36 is connected in parallel across R26 and grounded.

[0064] The input signal module utilizes opto-isolation technology to achieve electrical isolation between external vehicle status signals and internal circuitry, effectively resisting the effects of external electromagnetic interference and surges, ensuring the accuracy of vehicle status signal transmission. Through a front-end diode and resistor network, external input signals EXT_DSgn and EXT_SSgn of varying amplitudes can be adapted to meet the operating requirements of the optocoupler, making it widely applicable. The RC filter circuit at the output end filters out interference, providing high-quality vehicle status signals for subsequent circuits.

[0065] like Figure 10 In the pressure sensor module shown, the first pressure sensing signal terminal EXT_PSI1 is connected to one end of the Zener diode ZD4, one end of the capacitor C13, and one end of the resistor R13 via resistor R10, with the other end grounded. The second pressure sensing signal terminal EXT_PSI2 is connected to one end of the Zener diode ZD2, one end of the capacitor C17, and one end of the resistor R25 via resistor R11, with the other end grounded. An AI_PS1 terminal is provided between R10 and R13 for connection to the acquisition module, and an AI_PS2 terminal is provided between R11 and R25 for connection to the acquisition module. AI_PS1 is connected to pin PIN10 of the U3 microcontroller in the MCU module, and AI_PS2 is connected to pin PIN12 of the U3 microcontroller in the MCU module.

[0066] like Figure 11In the water level sensor module shown, the first water level sensing signal terminal EXT_WHS is connected to one end of the Zener diode ZD3, one end of the capacitor C16, and one end of the resistor R7 via resistor R29, with the other end grounded. The second water level sensing signal terminal EXT_WLS is connected to one end of the Zener diode ZD5, one end of the capacitor C19, and one end of the resistor R8 via resistor R32, with the other end grounded. An AI_WHS terminal for connection to the acquisition module is provided between R29 and R7, and an AI_WLS terminal for connection to the acquisition module is provided between R32 and R8. AI_WHS is connected to pin 13 of the U3 microcontroller in the MCU module, and AI_WLS is connected to pin 14 of the U3 microcontroller in the MCU module.

[0067] The pressure and water level signal acquisition module can simultaneously monitor pressure (upper pressure, lower pressure) and water level (upper water level, lower water level). With the help of overvoltage protection of Zener diodes, filtering effect of capacitors, and voltage division and current limiting of resistor network, the pressure and water level signals output by the sensor are stable and accurate.

[0068] like Figure 12 In the power supply voltage and output acquisition module shown, the voltage acquisition terminal EXT_V_24V is connected to one end of Zener diode ZD6, one end of capacitor C37, and one end of resistor R42 via resistor R22, with the other end grounded; the first solenoid valve voltage acquisition terminal EXT_HSD1 is connected to one end of Zener diode ZD7, one end of capacitor C38, and one end of resistor R45 via resistor R40, with the other end grounded; the second solenoid valve voltage acquisition terminal EXT_HSD2 is connected to one end of Zener diode ZD8, one end of capacitor C10, and one end of resistor R41 via resistor R21. One end is connected to the ground; there is an AI_VBUS terminal between R22 and R42 for connecting to the acquisition module, an AI_HSD1 terminal between R40 and R45 for connecting to the acquisition module, and an AI_HSD2 terminal between R21 and R41 for connecting to the acquisition module; AI_VBUS is connected to PIN7 of the U3 microcontroller in the MCU module, AI_HSD1 is connected to PIN11 of the U3 microcontroller in the MCU module, and AI_HSD2 is connected to PIN16 of the U3 microcontroller in the MCU module.

[0069] The power supply voltage and output acquisition module uses resistor dividers to reduce the high output voltage of the power supply or solenoid valve to a suitable voltage range for the acquisition port, facilitating voltage monitoring by the subsequent MCU circuit. Capacitors in each branch are used for filtering, reducing voltage fluctuations and noise; Zener diodes limit the voltage, protect the acquisition port, and improve circuit reliability. The voltage acquisition process consumes very little current, contributing to energy efficiency.

[0070] Working principle: when the external power supply is correctly connected (EXT_V_24V is positive and EXT_GND is negative): after the current is limited by R5, ZD1 is stabilized, the gate of MOS tube Q1 obtains a suitable voltage, Q1 is turned on, and the current flows from EXT_V_24V to GND through Q1, and the rear circuit obtains stable 24V power supply. When the external power supply is reversed (EXT_V_24V is negative and EXT_GND is positive): the gate of MOS tube Q1 cannot obtain a positive conduction voltage, Q1 is cut off, and the reverse current is blocked, thereby protecting the rear circuit from being burned out by the reverse current. D5 can quickly conduct when a momentary high-voltage surge occurs in the power supply, and clamp the voltage in a safe range to protect the rear elements. The filter network composed of C4, C5 and C6 can effectively filter out the AC ripple and electromagnetic interference in the 24V power supply, and provide pure DC power supply for the rear circuit. The MOS tube is used to realize anti-reverse connection, and compared with the traditional diode anti-reverse connection scheme, the conduction voltage drop is smaller, and it is suitable for large current scenes.

[0071] Considering that inductive loads such as electromagnetic valves will generate a reverse electromotive force (induced voltage) due to current mutation when power is off, the direction of the reverse electromotive force is opposite to that of the original voltage, and the amplitude can be several times of the power supply voltage, which is easy to break through MOSFET and other devices in the driving switch. The present application connects freewheeling diodes D1 and D2 in parallel with the inductive load (corresponding to the 24V_OUT1 and 24V_OUT2 output ends) in the circuit. When the inductive load is powered off, the current generated by the reverse electromotive force can form a low-impedance loop through the freewheeling diode to release the current, avoiding the application of high voltage on the high-side switch chip, effectively protecting the high-side switch device, greatly improving the reliability and stability of the circuit when driving inductive loads, and solving the industry pain point of damage to switch devices caused by reverse electromotive force of inductive loads when power is off.

[0072] The dual-pressure sensor voltage acquisition module is used to detect the filter core replacement time. When only a single pressure sensor is connected, the present application uses pressure mode to identify the filter core pressure, and when the predetermined set pressure is reached, the pressure state light is on to remind the replacement of the filter core. When dual pressure sensors are connected, the present application uses differential pressure mode to identify the filter core pressure, and when the predetermined set pressure is reached, the pressure state light is on to remind the replacement of the filter core.

[0073] The dual-water level sensor voltage acquisition module is used to detect the water level in the water tank. Compared with the traditional single water level sensor mode, this mode can effectively detect whether there is a water leakage problem in the water tank. When PIN13 pin and PIN14 pin detect low voltage, it is determined as high water level; when PIN13 pin detects high voltage and PIN14 pin detects low voltage, it is determined as low water level; when PIN13 pin detects high voltage and PIN14 pin detects high voltage, it is determined as no water level.

[0074] When the PIN 29 pin is detected to be low for more than 1s, the PIN 13 pin detects a high voltage, the PIN 19 pin and the PIN 20 pin are controlled to be low by the U3, and the PIN 22 pin and the PIN 23 pin are controlled to be low. The MCU module enters a sleep mode.

[0075] When the 24V high-side switch is short-circuited and overcurrent, the switch automatically identifies and closes the output, at this time, the PIN 11 detects a low voltage, determines that the water valve is short-circuited, and enters a water valve short-circuit protection state within 1s, and the PIN 20 pin pressure state light starts to flash. The PIN 16 detects a low voltage, determines that the electromagnetic valve is short-circuited, and enters an electromagnetic valve short-circuit protection state within 1s, and the PIN 20 pin pressure state light starts to flash.

[0076] When the PIN 30 of the single-chip microcomputer is low, the MCU module records an automatic mode, and after the vehicle is turned off, that is, the PIN 29 changes from high to low, and the PIN 13 and the PIN 14 are detected to be low, a drainage state is entered, and the PIN 22 outputs a high level to the electromagnetic valve coil to supply power for drainage.

[0077] When the PIN 30 of the single-chip microcomputer is high, the MCU module records a manual mode, and after the vehicle is turned off, that is, the PIN 30 changes from low to high, and the PIN 13 and the PIN 14 are detected to be high, a drainage state is entered, and the PIN 22 outputs a high level to the electromagnetic valve coil to supply power for drainage.

[0078] When the PIN 13 and the PIN 14 are detected to be low, and the PIN 29 is detected to be low, the MCU module detects a blockage, enters a fault alarm state, and the PIN 19 water level state indicator light flashes.

[0079] When the PIN 13 and the PIN 14 are detected to be high, and the PIN 29 is detected to be low, the MCU module detects a water leakage, enters a fault alarm state, and the PIN 19 water level state indicator light flashes.

[0080] When the PIN 10 voltage is detected to be less than 0.3v, and the PIN 12 voltage is detected to be greater than or equal to 0.5v, the average voltage of the PIN 12 pin within 20s is less than a set value, the PIN 20 outputs a low level to control the pressure state light to be off. When the PIN 10 voltage is detected to be less than 0.3v, and the PIN 12 voltage is detected to be greater than or equal to 0.5v, the average voltage of the PIN 12 pin within 20s is greater than or equal to a set value, the PIN 20 outputs a high level to control the pressure state light to be on.

[0081] PIN10 voltage ≥ 0.5v is detected, and PIN12 voltage ≥ 0.5v is detected at the same time, the average voltage difference between PIN10 and PIN12 pins within 20s is less than the pressure difference setting value, PIN20 outputs low level to control the pressure state lamp to be off.

[0082] PIN11 detects low voltage, determines that the water valve is short-circuited, enters the water valve short-circuit protection state within 1s, and the pressure state lamp at PIN20 pin starts to flash. PIN16 detects low voltage, determines that the electromagnetic valve is short-circuited, enters the electromagnetic valve short-circuit protection state within 1s, and the pressure state lamp at PIN20 pin starts to flash.

[0083] When the power supply is reversely connected, the gate of MOS tube Q1 cannot obtain a forward conduction voltage, Q1 is cut off, and the reverse current is blocked, thereby realizing reverse connection protection. When the normal connection is restored, the voltage is limited by R5, ZD1 is stabilized, the gate of MOS tube Q1 obtains a suitable voltage, Q1 is turned on, the current flows from EXT_V_24V to GND through Q1, and the rear circuit obtains stable 24V power supply.

[0084] When SW1 is pressed, PIN9 pin is pulled low to the ground, and after the duration ≥ 1s, PIN10 pin and PIN12 pin detect the calibration pressure, the MCU module performs pressure reset, which is used for pressure calibration after replacing the filter element.

[0085] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An intelligent diesel filtration controller characterized by, Comprise: MCU module, responsible for receiving signals and overall control; Anti-reverse connection module, reverse connection protection is realized through the switching characteristics of MOS tube, and TVS tube and filter capacitor are used to improve power quality and circuit stability; 5V high-side switch module, which can accurately control the on-off of 5V DC load, processes the control signal through a resistor network to ensure the stability of high-side switch control; DC-DC module, which converts input DC voltage into different output DC voltage to realize flexible management of power distribution; LDO module, which converts high voltage to low voltage output to ensure the stability and reliability of output voltage; 24V high-side switch module, which can support 2A inductive load current and drive multiple inductive loads or large current inductive loads, effectively suppressing inductive load reverse electromotive force during power-off and protecting high-side switch devices; CAN module, realizing high-reliability data transmission; Indicator light module, realizing accurate on-off control of indicator light; Input signal module, realizing electrical isolation between external vehicle body state signal and internal circuit, effectively resisting external electromagnetic interference and surge influence on the circuit, and ensuring the accuracy of vehicle body state signal transmission; Pressure sensor module, realizing pressure monitoring; Water level sensor module, realizing water level monitoring; Power voltage and output acquisition module, which reduces higher power or solenoid output voltage to a voltage range suitable for the acquisition port through resistor voltage division, facilitating subsequent voltage monitoring by the MCU circuit.

2. The intelligent diesel filtration controller of claim 1, wherein: The MCU module comprises a single-chip microcomputer U3, the 4th pin of the single-chip microcomputer U3 is connected with a V_3V3 end, the 5th pin is grounded, a capacitor C7 is connected between the V_3V3 end and a GND, one end of the capacitor C7 is connected with a resistor R9 and a capacitor C8, and the 9th pin of the single-chip microcomputer U3 is connected with a resistor R38 and a switch SW1 and grounded.

3. The intelligent diesel filtration controller of claim 1, wherein: The anti-reverse connection module comprises a diode D5, the two ends of the diode D5 are respectively connected with an EXT_V_24V end and an EXT_GND end, the EXT_V_24V end and the EXT_GND end are further connected with a capacitor C2, a capacitor C3 and a resistor R5, the other end of the resistor R5 is connected with a node T1, a triode Q1, a diode ZD1 and a capacitor C6, and the EXT_V_24V end and the GND end are connected with a capacitor C4 and a capacitor C5.

4. The intelligent diesel filtration controller of claim 2, wherein: The 5V high-side switch module comprises a chip U7 and a chip U12, the 3rd pin of the chip U7 is connected with a resistor R12, a resistor R30 and a node T22 and connected to the 27th pin of the single-chip microcomputer U3, the 2nd pin of the chip U7 is grounded, the 4th pin of the chip U7 is connected with a capacitor C21 and a capacitor C20 and connected with a V_5V end, and the 1st pin of the chip U7 is connected with a capacitor C22 and a node T25 and connected with an EXT_5VDC_OUT1 end. The 3-pin of the chip U12 is connected with the resistance R44, the resistance R47 and the node T38 and is connected to the 28-pin of the single-chip microcomputer U3, the 2-pin of the chip U12 is grounded, the 4-pin of the chip U12 is connected with the capacitor C29 and the capacitor C25 and is connected to the V_5V end, and the 1-pin of the chip U12 is connected with the capacitor C30 and the node T17 and is connected with the EXT_5VDC_OUT2 end.

5. The intelligent diesel filtration controller of claim 2, wherein: The DC-DC module comprises the chip U5, the capacitor C11 is connected between the 2-pin and the 1-pin of the chip U5, the 2-pin of the chip U5 is connected with the node T7 and the EXT_V_24V end, the 4-pin of the chip U5 is connected with the node T8 and the resistance R28 and is grounded, the 8-pin of the chip U5 is connected with the node T5, the inductor L2, the node T4, the capacitor C32 and the capacitor C14, the 7-pin of the chip U5 is connected with the capacitor C12 and is connected to the node T5, the 6-pin of the chip U5 is connected with the node T6 and the capacitor C15, and the 5-pin and the 8-pin of the chip U5 are connected with the node T9, the resistance R24 and the resistance R6. The LDO module comprises the chip U8, the 1-pin of the chip U8 is connected with the capacitor C34 and the capacitor C35, and the 5-pin of the chip U8 is connected with the capacitor C27 and the capacitor C26.

6. The intelligent diesel filtration controller of claim 2, wherein: The 24V high-side switch module comprises the chip U2 and the chip U4, the 2-pin of the chip U2 is connected with the node T19, the resistance R1 and the resistance R27 and is connected to the 23-pin of the single-chip microcomputer U3, the 3-pin of the chip U2 is connected with the node T20 and the diode D1, the 2-pin of the chip U4 is connected with the node T23, the resistance R4 and the resistance R31 and is connected to the 22-pin of the single-chip microcomputer U3, the 3-pin of the chip U4 is connected with the node T26 and the diode D2, and the 5-pin, the 6-pin, the 7-pin and the 8-pin of the chip U2 and the chip U4 are connected and are connected with the capacitor C18 and the capacitor C9.

7. The intelligent diesel filtration controller of claim 2, wherein: The indicator lamp module comprises the chip U9 and the chip U10, the 1-pin of the chip U9 is connected with the resistance R34, the node T37 and the resistance R19 and is connected to the 19-pin of the single-chip microcomputer U3, the 2-pin of the chip U9 is connected with the EXT_Lamp end, the 3-pin and the 4-pin of the chip U9 are connected and are grounded; The 1-pin of the chip U10 is connected with the resistance R33, the node T36 and the resistance R39 and is connected to the 20-pin of the single-chip microcomputer U3, the 2-pin of the chip U10 is connected with the EXT_PSO end, the 3-pin and the 4-pin of the chip U10 are connected and are grounded.

8. The intelligent diesel filtration controller of claim 2, wherein: The input signal module comprises the chip U6 and the chip U11, the 1-pin of the chip U6 is connected with the node T29, the resistance R14, the node T28, the diode D3 and the EXT_DSgn end, the 2-pin of the chip U6 is connected with the resistance R15 and is connected to the node T28, the 4-pin of the chip U6 is connected with the capacitor C23, the 3-pin of the chip U6 is connected with the resistance R17, the node T33, the capacitor C24 and the resistance R16 and is connected to the 30-pin of the single-chip microcomputer U3. The 1 pin of the chip U11 is connected with the ground T35, the resistance R18, the node T34, the diode D4 and the EXT_SSgn end, the 2 pin of the chip U11 is connected with the resistance R20 and is connected to the node T34, the 4 pin of the chip U11 is connected with the capacitor C28, the 3 pin of the chip U11 is connected with the resistance R26, the node T39, the capacitor C36 and the resistance R23 and is connected to the 29 pin of the single-chip U3.

9. The intelligent diesel filtration controller of claim 1, wherein: The pressure sensor module comprises the voltage stabilizer ZD4 and the voltage stabilizer ZD2, one end of the voltage stabilizer ZD4 is connected with the capacitor C13, the node T42, the resistance R13, the resistance R10 and is connected with the EXT_PSI1 end, one end of the voltage stabilizer ZD2 is connected with the capacitor C17, the node T41, the resistance R25, the resistance R11 and is connected with the EXT_PSI2 end; The water level sensor module comprises the voltage stabilizer ZD3 and the voltage stabilizer ZD5, one end of the voltage stabilizer ZD3 is connected with the capacitor C16, the node T31, the resistance R7, the resistance R29 and is connected with the EXT_WHS end, one end of the voltage stabilizer ZD5 is connected with the capacitor C19, the node T30, the resistance R8, the resistance R32 and is connected with the EXT_WLS end.

10. The intelligent diesel filtration controller of claim 1, wherein: The power voltage and output collection module comprises the voltage stabilizer ZD6, the voltage stabilizer ZD7 and the voltage stabilizer ZD8, one end of the voltage stabilizer ZD6 is connected with the capacitor C37, the node T24, the resistance R42 and the resistance R22, one end of the voltage stabilizer ZD7 is connected with the capacitor C38, the node T40, the resistance R40 and the resistance R45, one end of the voltage stabilizer ZD8 is connected with the capacitor C10, the node T15, the resistance R21 and the resistance R41.

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