A solenoid valve control system

Abstract

The utility model discloses a solenoid valve control system, solved the single control task mainly of current solenoid valve control system, the function setting is relatively simple and slow response, control precision is limited, and weak anti -interference ability's problem, including intelligent control module, high side drive module, loop current detection module, low side control module, power MOS pipe and buffer circuit, introduce overcurrent, overvoltage and short circuit etc. Multiple circuit protection mechanism, ensure that the whole system is always in stable, safe working condition, adopt high -performance drive circuit, can improve the response speed of solenoid valve significantly, and the buffer circuit is set to solenoid valve loop, overcome the sharp peak pulse brought from static friction to sliding friction of solenoid valve to reduce the response time's problem, still low side control module output's drive current can be under the condition that load is bigger or working voltage is lower, also can keep enough drive ability, ensure solenoid valve stable work.

Description

Technical Field

[0001] This utility model belongs to the field of intelligent control systems, specifically relating to a solenoid valve control system. Background Technology

[0002] With the rapid development of the automotive industry, vehicle driving control systems are playing an increasingly important role in improving driving experience and safety. Solenoid valves, as key components in hydraulic and pneumatic systems, are mainly used for the precise control of fluid flow, switching, and regulation, and are widely used in industrial automation, robotics, and automotive fields.

[0003] In traditional vehicle driving control systems, solenoid valves are mainly used to control systems such as braking, steering, and suspension. However, with the diversification of driving demands and the increasing level of intelligence, existing solenoid valve control systems have certain shortcomings in the following aspects:

[0004] Insufficient functionality: Traditional control systems are mostly designed for single control tasks and have relatively simple function settings, which cannot meet the requirements of modern vehicle environments for multi-functionality and adaptability to various scenarios. For example, they are inadequate in real-time monitoring, fault diagnosis, remote maintenance, energy consumption management, and intelligent optimization control, resulting in a lack of flexibility and responsiveness when facing complex operating conditions.

[0005] Response speed and control precision: In terms of performance, traditional systems may exhibit slow response speed, limited control precision, and weak anti-interference capabilities. This is mainly related to the limitations of their hardware processing power, signal transmission methods, and software algorithms. In driving scenarios requiring rapid response and high-precision control, traditional systems may not meet the requirements.

[0006] Chinese patent CN112393008A discloses a drive circuit for an automatic transmission solenoid valve and an automatic transmission. The drive circuit includes a high-side drive circuit, a low-side drive circuit, a solenoid valve, a current detection circuit, a signal detection circuit, and a control unit. The high-side drive circuit is connected to the solenoid valve and inputs a first modulation signal to drive the solenoid valve. A current detection circuit and a signal detection circuit are sequentially connected between the solenoid valve and the low-side drive circuit. The current detection circuit is located between the solenoid valve and the signal detection circuit. The first and second detection terminals of the control unit are connected to the current detection circuit and the signal detection circuit, respectively, and the current operating state of the solenoid valve is determined based on the feedback signals from the first and second detection terminals. The control terminal of the control unit is connected to the low-side drive circuit to control the operating state of the drive circuit. This solves the problem of insufficient detection capability in the drive circuit of the automatic transmission solenoid valve in the prior art. However, this patent does not solve the problems of insufficient functionality and the inability to meet requirements for response speed and control accuracy. Utility Model Content

[0007] The purpose of this invention is to address the problems of existing solenoid valve control systems, which are mainly designed for a single control task, have relatively simple function settings, slow response speed, limited control accuracy, and weak anti-interference ability, and to provide a new solenoid valve control system.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A solenoid valve control system is characterized by comprising an intelligent control module, a high-side drive module, a loop current detection module, a low-side control module, a power MOSFET, and a buffer circuit, wherein the power MOSFET is used to connect between the low end of the solenoid valve and ground.

[0010] The intelligent control module is connected to the high-side drive module, the loop current detection module, and the low-side control module respectively. The intelligent control module is used to connect to the information sensor on the pipeline where the solenoid valve is located, and to receive the pipeline information collected by the information sensor. At the same time, according to the pipeline information, it outputs the high-side drive enable signal, the detection module signal, and the low-side drive signal to the high-side drive module, the loop current detection module, and the low-side control module respectively.

[0011] The high-side drive module is used to connect to the power supply terminal of the solenoid valve, supply power to the solenoid valve according to the received high-side drive enable signal, and transmit the power supply information to the intelligent control module.

[0012] The loop current detection module is used to connect to the solenoid valve and detect whether the solenoid valve is in an overcurrent or abnormal state according to the received detection module signal. The detection result is input to the intelligent control module, and at the same time, the detection result is used to determine whether it is an enable reset signal.

[0013] The low-side control module is connected to the loop current detection module and the power MOSFET. The low-side control module receives the low-side drive signal and controls the power MOSFET to turn on or off according to the low-side drive signal, thereby driving the solenoid valve to open or close.

[0014] The buffer circuit is connected to the power MOSFET and is used to buffer high current or transient impacts input into the power MOSFET.

[0015] Furthermore, the intelligent control module includes an embedded microcontroller with a built-in PID algorithm. The GPIO pins of the embedded microcontroller are respectively configured as the high-side diagnostic enable terminal HSD_DEN, the high-side control terminal HSD_CMD, the solenoid valve fault monitoring terminal VALVE_FB, the solenoid valve current detection reset terminal VALVE_RESET, and the solenoid valve drive control signal terminal VALVE_CMD; the ADC pins are configured as the current feedback terminal HSD_IS and the solenoid valve current detection terminal VALVE_Monitor; the interrupt input pin is configured as the solenoid valve overcurrent alarm terminal VALVE_WARNNING.

[0016] The high-side diagnostic enable terminal HSD_DEN is connected to the enable input terminal of the high-side driver module;

[0017] The high-side control terminal HSD_CMD is connected to the control input terminal of the high-side driver module;

[0018] The current feedback terminal HSD_IS is connected to the output terminal of the high-side drive module;

[0019] The solenoid valve fault monitoring terminal VALVE_FB is connected to the fault monitoring output terminal of the loop current detection module.

[0020] The solenoid valve current detection terminal VALVE_Monitor is connected to the current detection output terminal of the loop current detection module;

[0021] The solenoid valve current detection reset terminal VALVE_RESET is connected to the reset input terminal of the loop current detection module;

[0022] The overcurrent alarm terminal VALVE_WARNNING of the solenoid valve is connected to the overcurrent output terminal of the loop current detection module;

[0023] The solenoid valve drive control signal terminal VALVE_CMD is connected to the output terminal of the low-side control module.

[0024] Furthermore, the high-side driving module includes a high-side driving chip U1, current-limiting resistors R1, R2, and R3, pull-down resistors R4 and R5, resistor R6, pull-down resistor R7, filter capacitors C3, C4, and C5.

[0025] The power input pin of the high-side driver chip U1 is connected to the primary power supply terminal VBAT;

[0026] The IN pin of the high-side driver chip U1 is connected to the high-side control terminal HSD_CMD through a current-limiting resistor R3, and one end of the current-limiting resistor R3 connected to the high-side control terminal HSD_CMD is grounded through a pull-down resistor R5.

[0027] The DEN pin of the high-side driver chip U1 is connected to the high-side diagnostic enable terminal HSD_DEN through the current-limiting resistor R2.

[0028] The IS pin of the high-side driver chip U1 is grounded through a pull-down resistor R7, and the IS pin is connected to one end of the current-limiting resistor R1. The other end of the current-limiting resistor R1 is connected to the upper plate of the filter capacitor C5 and the current feedback terminal HSD_IS. The lower plate of the filter capacitor C5 is grounded.

[0029] The GND pin of the high-side driver chip U1 is grounded through resistor R6;

[0030] The OUT pin of the high-side driver chip U1 is grounded through filter capacitor C3, filter capacitor C4, and pull-down resistor R4 respectively.

[0031] The OUT pin of the high-side driver chip U1 is used to connect to the power supply terminal of the solenoid valve.

[0032] Furthermore, the high-side driving module also includes capacitors C1 and C2;

[0033] Both capacitors C1 and C2 are connected in parallel between the power input pin of the high-side driver chip U1 and ground for filtering.

[0034] Furthermore, the loop current detection module includes a current detection amplifier U2, a current sensing resistor R15, a freewheeling diode D1, resistors R9, R12, R19, R20, capacitors C10 and C16.

[0035] The negative terminal of the freewheeling diode D1 is connected to the power supply terminal of the solenoid valve, and the positive terminal is connected to one end of the current sensing resistor R15. One end of the current sensing resistor R15 is also connected to the drain of the power MOSFET. The other end of the current sensing resistor R15 is connected to the low end of the solenoid valve and the upper plate of the capacitor C10. The lower plate of the capacitor C10 is grounded.

[0036] One end of resistor R9 is connected to the primary power supply terminal VBAT, the other end of resistor R9 is connected to the other end of current sensing resistor R15 and one end of resistor R12, the other end of resistor R12 is connected to one end of resistor R13 and the solenoid valve fault monitoring terminal VALVE_FB, and the other end of resistor R13 is grounded.

[0037] The current sensing amplifier U2 has a current sensing resistor R15 connected in series between its VIN+ and VIN- pins.

[0038] The OUT pin of the current sensing amplifier U2 is connected to the current sensing terminal VALVE_Monitor of the solenoid valve.

[0039] The VS pin of the current sensing amplifier U2 is connected to the secondary power supply terminal VCC_5V;

[0040] The CMP1 IN- pin of the current sensing amplifier U2 is shorted to its 1.2V REF OUT pin;

[0041] The CMP1 OUT pin of the current sensing amplifier U2 is connected in sequence to the current limiting resistor R23, the overcurrent alarm terminal VALVE_WARNNING of the solenoid valve, and the input terminal of the low-side control module.

[0042] The CMP1 RESET pin of the current sensing amplifier U2 is connected to the VALVE_RESET current sensing reset terminal of the solenoid valve.

[0043] The CMP1 IN+ pin of the current sensing amplifier U2 is connected to the upper plate of capacitor C16, one end of resistor R19, and one end of resistor R20, respectively. The lower plate of capacitor C16 and the other end of resistor R20 are grounded. The other end of resistor R19 is connected to the OUT pin of the current sensing amplifier U2.

[0044] The CMP2IN+ and GND pins of the current sensing amplifier U2 are both grounded;

[0045] The secondary power supply terminal VCC_5V is connected to the solenoid valve current detection reset terminal VALVE_RESET and the solenoid valve overcurrent alarm terminal VALVE_WARNNING through pull-up resistors R21 and R22, respectively.

[0046] Furthermore, the other end of the resistor R12 is connected to the solenoid valve fault monitoring terminal VALVE_FB via an RC filter consisting of resistor R11 and capacitor C7.

[0047] The VIN+ pin of the current sensing amplifier U2 is also connected to the current sensing resistor R15 via an RC filter consisting of resistor R14 and capacitor C9.

[0048] The VIN- pin of the current-sensing amplifier U2 is also connected to the current-sensing resistor R15 via an RC filter consisting of resistor R18 and capacitor C13.

[0049] A capacitor C11 is connected between the VIN+ pin and the VIN- pin of the current sensing amplifier U2.

[0050] Furthermore, an RC filter formed by resistor R16 and capacitor C14 and an RC filter formed by resistor R17 and capacitor C12 are connected sequentially between the OUT pin of the current sensing amplifier U2 and the current sensing terminal VALVE_Monitor of the solenoid valve; a capacitor C15 is connected between the end of resistor R16 and resistor R17 and ground.

[0051] Furthermore, the low-side control module includes a low-side gate controller U3, a transistor Q2, a current-limiting resistor R27, a pull-down resistor R28, a capacitor C17, and a capacitor C18.

[0052] The GND pin of the low-side gate controller U3 is grounded;

[0053] The INA pin of the low-side gate controller U3 is connected to the collector of transistor Q2 and one end of current-limiting resistor R27, respectively. The other end of current-limiting resistor R27 is connected to the solenoid valve drive control signal terminal VALVE_CMD and one end of pull-down resistor R28. The other end of pull-down resistor R28 is grounded.

[0054] The VCC pin of the low-side gate controller U3 is connected to the output terminal of the secondary power supply terminal VCC_5V, and the VCC pin of the low-side gate controller U3 is grounded through capacitor C17 and capacitor C18 respectively.

[0055] The OUTA pin of the low-side gate controller U3 is connected to the gate of the power MOSFET through resistor R24.

[0056] The emitter of transistor Q2 is grounded, and its base is connected to the CMP1OUT pin of the current sense amplifier U2.

[0057] Furthermore, the buffer circuit includes transistor Q3, current-limiting resistor R25, and matching resistor R26;

[0058] The base of transistor Q3 is connected to one end of current-limiting resistor R25. The other end of current-limiting resistor R25 and one end of matching resistor R26 are both connected to the source of power MOSFET. The collector of transistor Q3 is connected to the gate of power MOSFET. The emitter of transistor Q3 and the other end of matching resistor R26 are grounded.

[0059] The beneficial effects of this utility model are:

[0060] (1) This utility model provides a solenoid valve control system, which can make more detailed and accurate judgments on fault types, including fault diagnosis of open circuit, short circuit to power supply, and short circuit to ground when the output of the low-side control module is closed, and fault diagnosis of open circuit, short circuit to power supply, and short circuit to ground when the output of the low-side control module is open; the system also has a fault reset function, which restarts the system by outputting a reset signal when the fault disappears.

[0061] (2) This utility model provides an electromagnetic valve control system, which introduces multiple circuit protection mechanisms such as overcurrent, overvoltage and short circuit. Under abnormal working conditions, it can automatically detect and cut off the fault circuit in time, quickly respond and protect the downstream circuit, and at the same time feed back the alarm signal to the embedded microcontroller, thereby effectively avoiding safety hazards such as component damage and fire caused by abnormal current and voltage, and ensuring that the entire system is always in a stable and safe working state.

[0062] (3) This utility model provides a solenoid valve control system. The system adopts a high-performance drive circuit, which can significantly improve the response speed of the solenoid valve. The solenoid valve circuit is equipped with a buffer circuit to overcome the problem of peak pulses caused by the transition from static friction to sliding friction, thereby reducing the response time. This not only makes the control more sensitive, but also effectively meets the needs of high-frequency dynamic adjustment. In addition, the PID algorithm inside the embedded microcontroller accurately calculates the control accuracy. This closed-loop feedback mechanism makes the opening and closing and adjustment of the solenoid valve more precise, thereby achieving higher control accuracy in fluid control and adjustment applications, reducing errors and improving the overall system performance.

[0063] (4) This utility model provides a solenoid valve control system. The drive current output by the low-side control module can maintain sufficient drive capability even when the load is large or the working voltage is low. The enhanced drive capability enables the door driver to complete the opening and closing action of the solenoid valve in a shorter time, thereby improving the performance and reliability of the solenoid valve control system and ensuring the stable operation of the solenoid valve. Attached Figure Description

[0064] Figure 1 This is a diagram showing the module connection relationship in an embodiment of the solenoid valve control system of this utility model;

[0065] Figure 2 This is a hardware structure diagram of an embodiment of a solenoid valve control system according to the present invention.

[0066] Figure label:

[0067] 1-Intelligent control module; 2-High-side drive module; 3-Loop current detection module; 4-Low-side control module; 5-Power MOSFET; 6-Buffer circuit. Detailed Implementation

[0068] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0069] This embodiment provides a solenoid valve control system, such as... Figure 1 As shown, it includes an intelligent control module 1, a high-side drive module 2, a loop current detection module 3, a low-side control module 4, a power MOSFET 5, and a buffer circuit 6. The power MOSFET 5 is used to connect between the low end of the solenoid valve and ground.

[0070] The intelligent control module 1 is connected to the high-side drive module 2, the loop current detection module 3, and the low-side control module 4 respectively. The intelligent control module 1 is based on an embedded microcontroller with a built-in PID algorithm to achieve precise control of the solenoid valve. It can collect information such as pressure, flow rate, and temperature fed back by external sensors, monitor the fluid state in real time, and determine the current intention of the vehicle driver through logical judgment. Combined with the internal PID algorithm, it outputs the high-side drive enable signal, the detection module signal, and the low-side drive signal to the high-side drive module 2, the loop current detection module 3, and the low-side control module 4.

[0071] The high-side drive module 2 is used to connect to the power supply terminal of the solenoid valve, supply power to the solenoid valve according to the received high-side drive enable signal, and transmit the power supply information to the intelligent control module 1; the high-side drive module 2 has the functions of open circuit, short circuit to ground, short circuit to power supply and over-temperature fault diagnosis.

[0072] The loop current detection module 3 is used to connect to the solenoid valve and detect whether the solenoid valve is in an overcurrent or abnormal state according to the detection module signal output by the intelligent control module 1. At the same time, the detection result is input to the intelligent control module 1. The loop current detection module 3 is composed of a current sensing resistor, a freewheeling diode, a current sensing amplifier, a current sensing comparator and peripheral circuits. It is the key to ensuring system safety, improving control accuracy, realizing closed-loop feedback control method and fault alarm.

[0073] When the high-side drive module 2 of the solenoid valve outputs and forms a closed loop, a millivolt-level voltage difference is generated across the current sensing resistor. This voltage difference is amplified, filtered, and isolated by the current sensing amplifier, directly outputting a voltage signal proportional to the loop current, which is then acquired by the embedded microcontroller. When the high-side drive module 2 of the solenoid valve outputs and the closed loop opens, a back electromotive force is generated across the solenoid valve. Due to the presence of the freewheeling diode, a gradually decreasing current value continues to be generated in the loop composed of the solenoid valve, freewheeling diode, and current sensing resistor. The proportionally amplified voltage signal is again acquired by the embedded microcontroller. The amplified voltage signal from the current sensing comparator is compared with the threshold signal of the current sensing comparator and fed back to the embedded microcontroller as a level signal. By detecting the high or low level of this signal, the microcontroller diagnoses whether the current in the current loop is in an overcurrent or abnormal state, achieving automatic protection and fault alarm, and preventing device damage caused by abnormal current.

[0074] The low-side control module 4 is connected to the loop current detection module 3 via the power MOSFET 5. The low-side control module 4 receives the low-side drive signal and controls the power MOSFET 5 to turn on or off according to the low-side drive signal, thereby driving the solenoid valve to open or close. First, the embedded microcontroller provides a PWM control signal of a certain frequency and amplitude, i.e., the low-side drive signal. This signal is then amplified by the current drive of the control signal to drive the power MOSFET 5. When the power MOSFET 5 is on, the loop is open, and the solenoid valve opens; when the power MOSFET 5 is off, the loop is closed, and the solenoid valve closes.

[0075] Buffer circuit 6 is connected to power MOSFET 5 to buffer high current or transient surges input to power MOSFET 5. Buffer circuit 6 helps mitigate the impact of high current or transient surges on other power devices, thereby protecting the entire system from damage and improving the system's anti-interference capability and stability.

[0076] This embodiment provides a specific hardware configuration for a solenoid valve control system, as follows: Figure 2 As shown:

[0077] The intelligent control module 1 includes an embedded microcontroller with a built-in PID algorithm. The GPIO pins of the embedded microcontroller are respectively configured as the high-side diagnostic enable terminal HSD_DEN, the high-side control terminal HSD_CMD, the solenoid valve fault monitoring terminal VALVE_FB, the solenoid valve current detection reset terminal VALVE_RESET, and the solenoid valve drive control signal terminal VALVE_CMD; the ADC pins are configured as the current feedback terminal HSD_IS and the solenoid valve current detection terminal VALVE_Monitor; the interrupt input pin is configured as the solenoid valve overcurrent alarm terminal VALVE_WARNNING; in this embodiment, the embedded microcontroller is the Infineon TC27X series.

[0078] The high-side diagnostic enable terminal HSD_DEN is connected to the enable input terminal of the high-side driver module 2 (current limiting resistor R2, DEN pin of high-side driver chip U1); the high and low levels output by the embedded microcontroller control the diagnostic function of high-side driver chip U1.

[0079] The high-side control terminal HSD_CMD is connected to the control input terminal of the high-side driver module 2 (current limiting resistor R3, IN pin of high-side driver chip U1); the embedded microcontroller outputs a level signal to control the on / off state of the high-side driver chip U1 (controlling the on / off state of the solenoid valve power supply side).

[0080] The current feedback terminal HSD_IS is connected to the output terminal of the high-side drive module 2 (filter capacitor C5, current limiting resistor R1, and IS pin of high-side drive chip U1) to provide feedback on the current in the circuit of high-side drive chip U1. The embedded microcontroller reads the current value through the ADC to monitor whether the solenoid valve is overcurrent / undercurrent.

[0081] The solenoid valve fault monitoring terminal VALVE_FB is connected to the fault monitoring output terminal of the loop current detection module 3 (resistors R9, R12, and the first-stage power supply terminal vbat), which directly monitors the solenoid valve status (such as whether it is open circuit). When a fault occurs, it sends a level signal to the embedded microcontroller (such as a low level indicating a fault).

[0082] The solenoid valve current detection terminal VALVE_Monitor is connected to the current detection output terminal of the loop current detection module 3 (OUT pin of current detection amplifier U2), directly detecting the solenoid valve operating current and determining the load status (forming redundant monitoring with the current feedback terminal HSD_IS).

[0083] The solenoid valve current detection reset terminal VALVE_RESET is connected to the reset input terminal (pull-up resistor R21) of the loop current detection module 3. The embedded microcontroller outputs a reset signal (such as a pulse signal) to clear the fault latching state during current detection.

[0084] The overcurrent alarm terminal VALVE_WARNNING of the solenoid valve is connected to the overcurrent output terminal (pull-up resistor R22) of the loop current detection module 3. When an overcurrent occurs, an alarm signal is output (such as active low level), which triggers the embedded microcontroller interrupt processing (fast response protection).

[0085] The solenoid valve drive control signal terminal VALVE_CMD is connected to the output terminal of the low-side control module 4 (current limiting resistor R27, INA pin of low-side gate controller U3). The embedded microcontroller sends the detection module signal to the low-side gate controller U3 to control the on / off state of the solenoid valve ground side, and works with the high-side drive to achieve bidirectional control.

[0086] The high-side driver module 2 includes a high-side driver chip U1, current-limiting resistors R1, R2, and R3, pull-down resistors R4, R5, R6, and R7, and filter capacitors C3, C4, and C5. The primary power supply terminal VBAT is connected to the power input pin of the high-side driver chip U1. The IN pin of the high-side driver chip U1 is connected sequentially to the current-limiting resistor R3 and the high-side control terminal HSD_CMD, with one end of the current-limiting resistor R3 connected to the high-side control terminal HSD_CMD grounded through the pull-down resistor R5. The DEN pin of the high-side driver chip U1... Connect the current-limiting resistor R2 and the high-side diagnostic enable terminal HSD_DEN in sequence; the IS pin of the high-side driver chip U1 is grounded through the pull-down resistor R7, and the IS pin is connected to one end of the current-limiting resistor R1. The other end of the current-limiting resistor R1 is connected to the upper plate of the filter capacitor C5 and the current feedback terminal HSD_IS. The lower plate of the filter capacitor C5 is grounded; the GND pin of the high-side driver chip U1 is grounded through the resistor R6; the OUT pin of the high-side driver chip U1 is grounded through the filter capacitor C3, the filter capacitor C3, and the pull-down resistor R4 respectively; the OUT pin of the high-side driver chip U1 is used to connect to the solenoid valve.

[0087] In this embodiment, the high-side driver chip U1 is model RMJ6030-1-DF14.

[0088] like Figure 2 As shown, an external power supply is connected to the primary power supply terminal VBAT to power the high-side driver chip U1. The IN pin of the high-side driver chip U1 is connected in sequence to the current-limiting resistor R3 and the high-side control terminal HSD_CMD, and the current-limiting resistor R3 is grounded through the pull-down resistor R5. The DEN pin of the high-side driver chip U1 is connected in sequence to the current-limiting resistor R2 and the high-side diagnostic enable terminal HSD_DEN. The IS pin of the high-side driver chip U1 is grounded through the pull-down resistor R7, and the IS pin is connected to one end of the current-limiting resistor R1. The other end of the current-limiting resistor R1 is connected to the upper plate of the filter capacitor C5 and the current reverse... The lower plate of the filter capacitor C5 is grounded at the feed terminal HSD_IS; the GND pin of the high-side driver chip U1 is grounded through resistor R6; the OUT pin of the high-side driver chip U1 is grounded through filter capacitor C3, filter capacitor C4, and pull-down resistor R4 respectively; the OUT pin of the high-side driver chip U1 is used to connect to the solenoid valve; a filter component formed by capacitors C1 and C2 in parallel is also connected between the first-stage power supply terminal VBAT and the power input pin of the high-side driver chip U1; the upper plates of capacitors C3 and C4 are both connected to the OUT pin of the high-side driver chip U1, and the lower plates are both grounded.

[0089] The high-side control terminal HSD_CMD is connected to the current-limiting resistor R3, outputting a high-side drive enable signal to the IN pin of the high-side drive chip U1 to turn on the high-side drive chip U1. The pull-down resistor R5 is used to initialize the high-side chip, ensuring it is initially in a closed state. The high-side diagnostic enable terminal HSD_DEN is connected to the current-limiting resistor R2, outputting a control signal to the DEN pin of the high-side drive chip U1 to enable the diagnostic function of the high-side chip. The current feedback terminal HSD_IS of the high-side drive chip U1 outputs a proportional current signal based on the load drive current. This signal is converted into a voltage signal by the pull-down resistor R7, filtered by the current-limiting resistor R1 and the filter capacitor C5, and then fed back to the intelligent controller 1 (through the current feedback terminal HSD_IS). After the high-side drive chip U1 is turned on, the OUT pin of the high-side drive chip U1 outputs a high level. After being filtered by the capacitor C3 and the filter capacitor C4, it serves as the power supply terminal for the solenoid valve. The pull-down resistor R4 is used to initialize the high-side output voltage.

[0090] Figure 2 In the diagram, power MOSFET 5 is an insulated gate field-effect transistor Q1A.

[0091] The loop current detection module 3 includes a current detection amplifier U2, a current sensing resistor R15, and a freewheeling diode D1. The negative terminal of the freewheeling diode D1 is connected to the power supply terminal of the solenoid valve, and the positive terminal is connected to one end of the current sensing resistor R15. One end of the current sensing resistor R15 is also connected to the drain of the power MOSFET 5. The other end of the current sensing resistor R15 is connected to the solenoid valve and the upper plate of capacitor C10, and the lower plate of capacitor C10 is grounded. The primary power supply terminal VBAT is connected to one end of resistor R9, and the other end of resistor R9 is connected to the other end of current sensing resistor R15 and resistor R12. One end of resistor R12 is connected to one end of resistor R13 and the solenoid valve fault monitoring terminal VALVE_FB, and the other end of resistor R13 is grounded; a current sensing resistor R15 is connected in series between the VIN+ and VIN- pins of the current sensing amplifier U2; the OUT pin of the current sensing amplifier U2 is connected to the solenoid valve current sensing terminal VALVE_Monitor; the VS pin of the current sensing amplifier U2 is connected to the secondary power supply terminal VCC_5V, and is powered through the secondary power supply terminal VCC_5V; the CMP1 of the current sensing amplifier U2... The IN- pin is shorted to the 1.2VREF OUT pin; the CMP1 OUT pin of the current-sensing amplifier U2 is connected in sequence to the current-limiting resistor R23 and the solenoid valve overcurrent alarm terminal VALVE_WARNNING; the CMP1 RESET pin of the current-sensing amplifier U2 is connected to the solenoid valve current detection reset terminal VALVE_RESET; the CMP1 IN+ pin of the current-sensing amplifier U2 is connected to the upper plate of capacitor C16, one end of resistor R19, and one end of resistor R20 respectively; the lower plate of capacitor C16 and the other end of resistor R20 are grounded; the other end of resistor R19 is connected to the OUT pin of the current-sensing amplifier U2; the CMP2 IN+ pin and GND pin of the current-sensing amplifier U2 are both grounded; the secondary power supply terminal VCC_5V is connected to the solenoid valve current detection reset terminal VALVE_RESET and the solenoid valve overcurrent alarm terminal VALVE_WARNNING through pull-up resistors R21 and R22 respectively.

[0092] In this embodiment, the current sensing amplifier U2 is a CSA315.

[0093] The other end of resistor R12 is connected to the solenoid valve fault monitoring terminal VALVE_FB via an RC filter consisting of resistor R11 and capacitor C7; the VIN+ pin of current sensing amplifier U2 is connected to the current sensing resistor R15 via an RC filter consisting of resistor R14 and capacitor C9; the VIN- pin of current sensing amplifier U2 is connected to the current sensing resistor R15 via an RC filter consisting of resistor R18 and capacitor C13; capacitor C11 is connected between capacitor C9 and capacitor C13. The OUT pin of current sensing amplifier U2 is connected to the solenoid valve current sensing terminal VALVE_Monitor via an RC filter consisting of resistor R16 and capacitor C14, and an RC filter consisting of resistor R17 and capacitor C12; capacitor C15 is connected between resistor R16 and resistor R17; capacitors C12, C14, and C15 are all grounded.

[0094] In this embodiment, an external power supply is connected through the primary power supply terminal VBAT to power the current sensing amplifier U2. The primary power supply terminal VBAT, resistors R9, R12, and R13 form a voltage divider circuit. The voltage divider signal passes through an RC filter composed of resistor R11 and capacitor C7, and is then output as the solenoid valve fault monitoring terminal signal VALVE_FB for acquisition. This port acquires four voltage signals, corresponding to four states: normal circuit, open circuit, short circuit to power supply, and short circuit to ground. When the circuit is normal, the acquired signal is the sum of the voltage drop across the current sensing resistor R15, the on-state voltage drop of power MOSFET 5, and the voltage drop across the matching resistor R26. When the circuit is open, the acquired signal is the voltage drop across resistor R13 in the circuit composed of resistors R9, R12, and R13 at the primary power supply terminal VBAT. When the circuit is short-circuited to power supply, the acquired signal is the voltage drop across resistor R13 in the circuit composed of resistors R12 and R13 at the power supply terminal. When the circuit is short-circuited to ground, the acquired signal is the ground level. The secondary power supply terminal VCC_5V supplies power to the current sense amplifier U2 through the filter capacitor C8. The voltage generated across the current sensing resistor R15 is filtered by an RC filter composed of resistor R14 and capacitor C9, a filter composed of resistor R18 and capacitor C13, and capacitor C11, before entering the positive and negative input channels of the current sense amplifier U2. After amplification, the signal is output from the OUT pin of the current sense amplifier U2. This output signal is then filtered by a filter composed of resistor R16, resistor R17, capacitor C12, capacitor C14, and capacitor C15. The resulting signal is acquired by the solenoid valve current sensing terminal VALVE_Monitor, and then passes through a voltage divider circuit composed of resistors R19 and R20. The voltage drop across resistor R20 is related to the voltage generated internally by the current sense amplifier U2. The reference voltage is compared, and the output signal passes through the current-limiting resistor R23 to form a signal that is acquired by the intelligent controller 1 through the solenoid valve overcurrent alarm terminal VALVE_WARNNING. It is pulled up by default, and this output signal is also used to cut off the low-side control signal. At the same time, the current sensing amplifier U2 has a reset pin RESET, which is connected to the secondary power supply terminal VCC_5V through the pull-up resistor R21. When the solenoid valve current sensing reset terminal VALVE_RESET of the intelligent controller 1 is low, the current sensing amplifier U2 is reset and restarted. The solenoid valve, sensing resistor R15 and freewheeling diode D1 form a freewheeling circuit to ensure that the solenoid valve current can be acquired when the circuit is open and closed. Capacitor C10 is used for charging and discharging to maintain current stability and rapid opening and closing of the circuit.

[0095] The low-side control module 4 includes a low-side gate controller U3, transistor Q2, current-limiting resistor R27, pull-down resistor R28, capacitor C17, and capacitor C18. The GND pin of the low-side gate controller U3 is grounded. The INA pin of the low-side gate controller U3 is connected to the collector of transistor Q2 and one end of current-limiting resistor R27. The other end of current-limiting resistor R27 is connected to the solenoid valve drive control signal terminal VALVE_CMD and one end of pull-down resistor R28. The other end of pull-down resistor R28 is grounded. The VCC pin of the low-side gate controller U3 is connected to the output of the secondary power supply terminal VCC_5V. The output of the secondary power supply terminal VCC_5V is grounded through capacitors C17 and C18. The OUTA pin of the low-side gate controller U3 is connected to resistor R24 ​​and the gate of power MOSFET 5. The emitter of transistor Q2 is grounded, and its base is connected to the CMP1 OUT pin of current-sensing amplifier U2. The secondary power supply terminal VCC_5V is connected to an external power supply to power the low-side gate controller U3.

[0096] In this embodiment, the specific model of the low-side gate controller U3 is RS8802.

[0097] The intelligent controller 1 outputs a low-side drive signal, which passes through the current-limiting resistor R27 and enters the INA pin of the low-side gate controller U3. The pull-down resistor R28 is used to initialize the control signal. The OUTA output of the low-side gate controller U3 outputs a high-drive-capability control signal, which passes through the current-limiting resistor R24 ​​and reaches the gate of the power MOSFET 5.

[0098] The buffer circuit 6 includes transistor Q3, current-limiting resistor R25, and matching resistor R26. The base of transistor Q3 is connected to one end of current-limiting resistor R25, the other end of current-limiting resistor R25 and one end of matching resistor R26 are both connected to the source of power MOSFET 5, the collector of transistor Q3 is connected to the drain of power MOSFET 5, and the emitter of transistor Q3 and the other end of matching resistor R26 are grounded.

[0099] The low-side control module 4 outputs a drive control signal to periodically turn power MOSFET 5 on and off. Upon initial turn-on, a voltage drop occurs across the matching resistor R26. When this voltage drop reaches the turn-on threshold of transistor Q3, transistor Q3 turns on, the control signal is connected to ground, power MOSFET 5 turns off, and the solenoid valve circuit is cut off. Once the voltage drop across matching resistor R26 ceases, transistor Q3 turns off again, and the control signal continues to turn power MOSFET 5 on. This buffer circuit mitigates the impact of high current or transient surges on other power devices, enhancing the stability of the control system.

[0100] The above description is merely a specific embodiment of this utility model and a comparison of the effects of the specific embodiments with relevant comparative examples. However, the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A solenoid valve control system, characterized in that, It includes an intelligent control module (1), a high-side drive module (2), a loop current detection module (3), a low-side control module (4), a power MOSFET (5), and a buffer circuit (6), wherein the power MOSFET (5) is used to connect between the low end of the solenoid valve and ground; The intelligent control module (1) is connected to the high-side drive module (2), the loop current detection module (3), and the low-side control module (4) respectively. The intelligent control module (1) is used to connect to the information sensor on the pipeline where the solenoid valve is located, and to receive the pipeline information collected by the information sensor. At the same time, according to the pipeline information, it outputs the high-side drive enable signal, the detection module signal and the low-side drive signal to the high-side drive module (2), the loop current detection module (3) and the low-side control module (4) respectively. The high-side drive module (2) is used to connect to the power supply terminal of the solenoid valve, supply power to the solenoid valve according to the received high-side drive enable signal, and transmit the power supply information to the intelligent control module (1). The loop current detection module (3) is used to connect to the solenoid valve and detect whether the solenoid valve is in an overcurrent or abnormal state according to the received detection module signal. The detection result is input to the intelligent control module (1), and at the same time, it is determined whether it is an enable reset signal according to the detection result. The low-side control module (4) is connected to the loop current detection module (3) and the power MOSFET (5). The low-side control module (4) receives the low-side drive signal and controls the power MOSFET (5) to open or close according to the low-side drive signal, thereby realizing the opening or closing of the solenoid valve. The buffer circuit (6) is connected to the power MOSFET (5) and is used to buffer the high current or transient impact input into the power MOSFET (5).

2. The solenoid valve control system according to claim 1, characterized in that, The intelligent control module (1) includes an embedded microcontroller with a built-in PID algorithm. The GPIO pins of the embedded microcontroller are respectively set as the high-side diagnostic enable terminal HSD_DEN, the high-side control terminal HSD_CMD, the solenoid valve fault monitoring terminal VALVE_FB, the solenoid valve current detection reset terminal VALVE_RESET, and the solenoid valve drive control signal terminal VALVE_CMD; the ADC pin is set as the current feedback terminal HSD_IS and the solenoid valve current detection terminal VALVE_Monitor; the interrupt input pin is set as the solenoid valve overcurrent alarm terminal VALVE_WARNNING. The high-side diagnostic enable terminal HSD_DEN is connected to the enable input terminal of the high-side driver module (2); The high-side control terminal HSD_CMD is connected to the control input terminal of the high-side drive module (2); The current feedback terminal HSD_IS is connected to the output terminal of the high-side drive module (2); The solenoid valve fault monitoring terminal VALVE_FB is connected to the fault monitoring output terminal of the loop current detection module (3); The solenoid valve current detection terminal VALVE_Monitor is connected to the current detection output terminal of the loop current detection module (3). The solenoid valve current detection reset terminal VALVE_RESET is connected to the reset input terminal of the loop current detection module (3); The overcurrent alarm terminal VALVE_WARNNING of the solenoid valve is connected to the overcurrent output terminal of the loop current detection module (3); The solenoid valve drive control signal terminal VALVE_CMD is connected to the output terminal of the low-side control module (4).

3. The solenoid valve control system according to claim 2, characterized in that, The high-side drive module (2) includes a high-side drive chip U1, a current-limiting resistor R1, a current-limiting resistor R2, a current-limiting resistor R3, a pull-down resistor R4, a pull-down resistor R5, a resistor R6, a pull-down resistor R7, a filter capacitor C3, a filter capacitor C4, and a filter capacitor C5. The power input pin of the high-side driver chip U1 is connected to the primary power supply terminal VBAT; The IN pin of the high-side driver chip U1 is connected to the high-side control terminal HSD_CMD through a current-limiting resistor R3, and one end of the current-limiting resistor R3 connected to the high-side control terminal HSD_CMD is grounded through a pull-down resistor R5. The DEN pin of the high-side driver chip U1 is connected to the high-side diagnostic enable terminal HSD_DEN through the current-limiting resistor R2. The IS pin of the high-side driver chip U1 is grounded through a pull-down resistor R7, and the IS pin is connected to one end of the current-limiting resistor R1. The other end of the current-limiting resistor R1 is connected to the upper plate of the filter capacitor C5 and the current feedback terminal HSD_IS. The lower plate of the filter capacitor C5 is grounded. The GND pin of the high-side driver chip U1 is grounded through resistor R6; The OUT pin of the high-side driver chip U1 is grounded through filter capacitor C3, filter capacitor C4, and pull-down resistor R4 respectively. The OUT pin of the high-side driver chip U1 is used to connect to the power supply terminal of the solenoid valve.

4. The solenoid valve control system according to claim 3, characterized in that, The high-side driving module (2) also includes capacitors C1 and C2; Both capacitors C1 and C2 are connected in parallel between the power input pin of the high-side driver chip U1 and ground for filtering.

5. The solenoid valve control system according to claim 3, characterized in that, The loop current detection module (3) includes a current detection amplifier U2, a current detection resistor R15, a freewheeling diode D1, a resistor R9, a resistor R12, a resistor R19, a resistor R20, a capacitor C10, and a capacitor C16. The negative terminal of the freewheeling diode D1 is connected to the power supply terminal of the solenoid valve, and the positive terminal is connected to one end of the current sensing resistor R15. One end of the current sensing resistor R15 is also connected to the drain of the power MOSFET (5). The other end of the current sensing resistor R15 is connected to the low end of the solenoid valve and the upper plate of the capacitor C10, respectively. The lower plate of the capacitor C10 is grounded. One end of resistor R9 is connected to the primary power supply terminal VBAT, the other end of resistor R9 is connected to the other end of current sensing resistor R15 and one end of resistor R12, the other end of resistor R12 is connected to one end of resistor R13 and the solenoid valve fault monitoring terminal VALVE_FB, and the other end of resistor R13 is grounded. The current sensing amplifier U2 has a current sensing resistor R15 connected in series between its VIN+ and VIN- pins. The OUT pin of the current sensing amplifier U2 is connected to the current sensing terminal VALVE_Monitor of the solenoid valve. The VS pin of the current sensing amplifier U2 is connected to the secondary power supply terminal VCC_5V; The CMP1 IN- pin of the current sensing amplifier U2 is shorted to its 1.2V REF OUT pin; The CMP1 OUT pin of the current sensing amplifier U2 is connected in sequence to the current limiting resistor R23, the solenoid valve overcurrent alarm terminal VALVE_WARNNING, and the input terminal of the low-side control module (4). The CMP1 RESET pin of the current sensing amplifier U2 is connected to the VALVE_RESET current sensing reset terminal of the solenoid valve. The CMP1 IN+ pin of the current sensing amplifier U2 is connected to the upper plate of capacitor C16, one end of resistor R19, and one end of resistor R20, respectively. The lower plate of capacitor C16 and the other end of resistor R20 are grounded. The other end of resistor R19 is connected to the OUT pin of the current sensing amplifier U2. The CMP2IN+ and GND pins of the current sensing amplifier U2 are both grounded; The secondary power supply terminal VCC_5V is connected to the solenoid valve current detection reset terminal VALVE_RESET and the solenoid valve overcurrent alarm terminal VALVE_WARNNING through pull-up resistors R21 and R22, respectively.

6. The solenoid valve control system according to claim 5, characterized in that, The other end of the resistor R12 is also connected to the solenoid valve fault monitoring terminal VALVE_FB via an RC filter consisting of resistor R11 and capacitor C7. The VIN+ pin of the current sensing amplifier U2 is also connected to the current sensing resistor R15 via an RC filter consisting of resistor R14 and capacitor C9. The VIN- pin of the current-sensing amplifier U2 is also connected to the current-sensing resistor R15 via an RC filter consisting of resistor R18 and capacitor C13. A capacitor C11 is connected between the VIN+ pin and the VIN- pin of the current sensing amplifier U2.

7. The solenoid valve control system according to claim 5, characterized in that, The OUT pin of the current sensing amplifier U2 is connected to the current sensing terminal VALVE_Monitor of the solenoid valve by an RC filter formed by resistor R16 and capacitor C14, and an RC filter formed by resistor R17 and capacitor C12; a capacitor C15 is connected between the end of resistor R16 and resistor R17 and ground.

8. The solenoid valve control system according to claim 5, characterized in that, The low-side control module (4) includes a low-side gate controller U3, a transistor Q2, a current-limiting resistor R27, a pull-down resistor R28, a capacitor C17, and a capacitor C18. The GND pin of the low-side gate controller U3 is grounded; The INA pin of the low-side gate controller U3 is connected to the collector of transistor Q2 and one end of current-limiting resistor R27, respectively. The other end of current-limiting resistor R27 is connected to the solenoid valve drive control signal terminal VALVE_CMD and one end of pull-down resistor R28. The other end of pull-down resistor R28 is grounded. The VCC pin of the low-side gate controller U3 is connected to the output terminal of the secondary power supply terminal VCC_5V, and the VCC pin of the low-side gate controller U3 is grounded through capacitor C17 and capacitor C18 respectively. The OUTA pin of the low-side gate controller U3 is connected to the gate of the power MOSFET (5) through resistor R24; The emitter of transistor Q2 is grounded, and its base is connected to the CMP1OUT pin of the current sense amplifier U2.

9. A solenoid valve control system according to claim 8, characterized in that, The buffer circuit (6) includes transistor Q3, current-limiting resistor R25, and matching resistor R26; The base of transistor Q3 is connected to one end of current-limiting resistor R25. The other end of current-limiting resistor R25 and one end of matching resistor R26 are both connected to the source of power MOSFET (5). The collector of transistor Q3 is connected to the gate of power MOSFET (5). The emitter of transistor Q3 and the other end of matching resistor R26 are grounded.

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