Wide-voltage electromagnetic valve control system based on MOS (Metal Oxide Semiconductor)

Abstract

The utility model discloses a wide-voltage electromagnetic valve control system based on a metal oxide semiconductor (MOS), which particularly relates to the technical field of diesel fork lift trucks and comprises a power supply module, a starting switch, a safety piece, a vehicle controller and an electromagnetic valve. The power supply module is connected with the starting switch, the starting switch is connected with the vehicle controller through the safety piece, and the vehicle controller is connected with the electromagnetic valve. The interior of the vehicle controller comprises a multi-way switch signal circuit, a single-chip microcomputer protection circuit and a control electromagnetic valve circuit. The single-chip microcomputer protection circuit comprises an over-current protection circuit, an anti-surge protection circuit, a wide voltage reduction circuit, an over-voltage protection circuit and an under-voltage protection circuit. According to the utility model, the MOS tube switch is used in the vehicle controller to control the electromagnetic valve, so that the switching speed is higher, no contact is caused to attract noise, no contact is caused to attract sparks, and meanwhile, the control current consumption of the MOS tube is extremely low, and the power consumption is low; moreover, semiconductor switch control is more suitable for a wide-voltage whole machine, electromagnetic valve driving of different voltage grades is met, and application is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of internal combustion forklifts, and more specifically, to a MOS-based wide-voltage solenoid valve control system. Background Technique

[0002] It is known that the new CE standard EN1175:2020 is implemented in the EU region. In order to make the whole forklift meet the newly implemented EN1175:2020 and meet the sales requirements for export to the EU and the UK regions, the whole machine controller also needs to meet EN1175:2020, that is, the whole machine controller needs to obtain a CE certification; among them, for functions related to safety, safety certification is required, that is, the functional safety certification of the whole machine needs to reach PL d level.

[0003] However, due to the long cycle and high cost of CE and functional safety certifications, it takes a long time and high cost for existing forklifts to obtain CE and functional safety certifications; among them, due to load reasons, the rated voltage of the whole internal combustion forklift is DC12V and DC24V, and the voltage levels of the output solenoid valves (5) to be controlled also have two specifications of DC12V and DC24V. The controller needs to meet the requirements of these two specifications at the same time, or two controllers with two voltage levels are required; while existing forklift products cannot better meet the production and market demands, so a MOS-based wide-voltage solenoid valve control system is proposed as a further improvement. Summary of the Utility Model

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a MOS-based wide-voltage solenoid valve control system to solve the problems raised in the above background technique.

[0005] To achieve the above object, the utility model provides the following technical solution: A MOS-based wide-voltage solenoid valve control system, the system includes: a power supply module, a start switch, a fuse, a vehicle controller, and a solenoid valve;

[0006] The power supply module is connected to one end of the start switch, the other end of the start switch is connected to the input end of the vehicle controller through a fuse, and the output end of the vehicle controller is connected to the solenoid valve;

[0007] The interior of the vehicle controller includes: a multi-channel switch signal circuit, a single-chip microcomputer protection circuit, and a solenoid valve control circuit;

[0008] The single-chip microcomputer protection circuit includes: an overcurrent protection circuit, a surge protection circuit, a step-down wide-voltage circuit, an overvoltage protection circuit, and an undervoltage protection circuit;

[0009] The overcurrent protection circuit is connected to the surge protection circuit, the surge protection circuit is connected to the pulse-width reduction voltage circuit, the pulse-width reduction voltage circuit is connected to the overvoltage protection circuit, and the overvoltage protection circuit is connected to the undervoltage protection circuit;

[0010] The control solenoid valve circuit is connected to the solenoid valve; the multi-channel switch signal circuit is connected to the undervoltage protection circuit.

[0011] Further, the overcurrent protection circuit includes: diode D1 and zener diode D2;

[0012] The input end of the vehicle controller is set as power supply V, the power supply V is connected to the positive electrode of diode D1, the negative electrode of diode D1 is connected to the negative electrode of zener diode D2, and the positive electrode of zener diode D2 is grounded; both the positive and negative electrodes of zener diode D2 are connected to the surge protection circuit.

[0013] Further, the surge protection circuit includes: capacitor C1, capacitor C2 and capacitor C3;

[0014] The positive electrodes of capacitor C1, capacitor C2 and capacitor C3 are all connected to the negative electrode of zener diode D2;

[0015] The positive electrode of zener diode D2, the negative electrode of capacitor C1, the negative electrode of capacitor C2 and the negative electrode of capacitor C3 are all grounded; the positive electrodes of capacitor C1, capacitor C2 and capacitor C3 are connected to the pulse-width reduction voltage circuit.

[0016] Further, the pulse-width reduction voltage circuit includes: DC-DC conversion chip U1, diode D3, capacitor C4, capacitor C5 and low-voltage conversion chip U2;

[0017] The positive electrodes of capacitor C1, capacitor C2 and capacitor C3 are connected to the input end of DC-DC conversion chip U1, the output end of DC-DC conversion chip U1 is connected to the negative electrode of diode D3, the positive electrode of capacitor C4, the positive electrode of capacitor C5 and the input end of low-voltage conversion chip U2, and one output end of DC-DC conversion chip U1, the positive electrode of diode D3, the negative electrode of capacitor C4 and the negative electrode of capacitor C5 are all grounded;

[0018] The output end of the low-voltage conversion chip U2 is connected to the overvoltage protection circuit.

[0019] Further, the overvoltage protection circuit includes: zener diode D4, P-channel MOS transistor Q1 and PNP-type triode Q2;

[0020] The output end of the low-voltage conversion chip U2 is connected to the source of P-channel MOS transistor Q1 and the base of PNP-type triode Q2;

[0021] The output terminal of the low-voltage conversion chip U2 is connected to the negative electrode of the voltage-regulating diode D4 and the emitter of the PNP-type triode Q2 through a resistor;

[0022] The gate of the P-channel MOS transistor Q1 is connected to the collector of the PNP-type triode Q2 through a resistor. The collector of the PNP-type triode Q2 is grounded through a resistor, and the positive electrode of the voltage-regulating diode D4 is grounded;

[0023] The drain of the P-channel MOS transistor Q1 is connected to the undervoltage protection circuit.

[0024] Further, the undervoltage protection circuit includes: a voltage monitoring chip U4 and a single-chip microcomputer U3;

[0025] The drain of the P-channel MOS transistor Q1 is connected to the input terminal of the single-chip microcomputer U3 and the reset terminal of the voltage monitoring chip U4;

[0026] One output terminal of the single-chip microcomputer U3 is connected to the reset terminal of the voltage monitoring chip U4 and grounded through a capacitor C6. The other output terminal of the single-chip microcomputer U3 is connected to the input terminal of the voltage monitoring chip U4 through a capacitor and grounded.

[0027] Further, the multi-channel switch signal circuit includes: a switch quantity processing module, a filter capacitor C7, and a multi-channel switch signal sampling chip U5;

[0028] The start switch is also connected to one end of the switch quantity processing module through a fuse. The other end of the switch quantity processing module is also connected to the filter capacitor C7 and the input terminal of the multi-channel switch signal sampling chip U5. The other end of the filter capacitor C7 and the output terminal of the multi-channel switch signal sampling chip U5 are both grounded. The other output terminal of the multi-channel switch signal sampling chip U5 is connected to the signal input terminal of the single-chip microcomputer U3.

[0029] The technical effects and advantages of the present invention:

[0030] 1. The multi-channel switch signal circuit is used for the switch signal of the vehicle controller, instead of the traditional optocoupler for the conduction and cut-off of the switch signal. The multi-channel switch signal circuit can realize multi-signal acquisition, with small volume, high reliability, good stability, and low power consumption;

[0031] 2. The MOS tube switch is used to control the solenoid valve in the multi-channel switch signal circuit, single-chip microcomputer protection circuit and control solenoid valve circuit of the vehicle controller. There is no mechanical wear, the switching speed is faster, there is no contact suction noise and no contact suction spark. At the same time, the control current consumption of the MOS tube is extremely small, and the power consumption is low. Moreover, the semiconductor switch control has a long service life and can better meet the PL value requirements of EN1175:2020 for electrical components. It has a small volume, and the MOS tube switch control is more suitable for the whole machine with wide voltage application, which can meet the solenoid valve drive of different voltage levels, reduce the product model and other management costs, and has a wider application range. Description of the Drawings

[0032] Figure 1 Schematic diagram of the vehicle controller circuit of the present utility model.

[0033] Figure 2 Schematic diagram of the overcurrent protection circuit of the present utility model.

[0034] Figure 3 Schematic diagram of the surge protection circuit of the present utility model.

[0035] Figure 4 Schematic diagram of the step-down wide voltage circuit of the present utility model.

[0036] Figure 5 Schematic diagram of the overvoltage protection circuit of the present utility model.

[0037] Figure 6 Schematic diagram of the undervoltage protection circuit of the present utility model.

[0038] Reference numerals are:

[0039] 1. Power supply module; 2. Start switch; 3. Fuse;

[0040] 4. Vehicle controller;

[0041] 41. Multi-channel switch signal circuit; 411. Switch quantity processing module;

[0042] 42. Single-chip microcomputer protection circuit;

[0043] 421. Overcurrent protection circuit; 422. Surge protection circuit; 423. Step-down wide voltage circuit;

[0044] 424. Overvoltage protection circuit; 425. Undervoltage protection circuit;

[0045] 43. Control solenoid valve circuit;

[0046] 5. Solenoid valve. Detailed Implementation Manner

[0047] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0048] As shown in the attached Figures 1-6 A MOS-based wide-voltage solenoid valve control system, the system includes: a power supply module 1, a start switch 2, a fuse 3, a vehicle controller 4 and a solenoid valve 5;

[0049] Among them, the power supply module 1 is used to provide power for the entire system;

[0050] The start switch 2 is used to supply power to and start the whole machine, and is divided into a power-on Acc gear and a start Star gear; the vehicle controller 4 is used to control the operation of multiple valves such as the vehicle's walking and lifting;

[0051] The solenoid valve 5 includes a walking solenoid valve, a lifting oil inlet solenoid valve and a lifting oil return solenoid valve, and the working principles of these solenoid valves are the same; therefore, in this embodiment, the walking solenoid valve is taken as an example;

[0052] Among them, the vehicle controller 4 includes a digital input / output signal processing module 411, and the digital input / output signals in the digital input / output signal processing module 411 include: forward, reverse, neutral, first gear, second gear, valve control switch and seat switch; since the principles of various switches are the same, they will not be all described here;

[0053] The power supply module 1 is connected to one end of the start switch 2, the other end of the start switch 2 is connected to the input end of the vehicle controller 4 through the fuse 3, and the output end of the vehicle controller 4 is connected to the solenoid valve 5;

[0054] The interior of the vehicle controller 4 includes: a multiplex switch signal circuit 41, a microcontroller protection circuit 42 and a solenoid valve control circuit 43;

[0055] The microcontroller protection circuit 42 includes: an overcurrent protection circuit 421, a surge protection circuit 422, a step-down wide-voltage circuit 423, an overvoltage protection circuit 424 and an undervoltage protection circuit 425;

[0056] The overcurrent protection circuit 421 is connected to the surge protection circuit 422, the surge protection circuit 422 is connected to the step-down wide-voltage circuit 423, the step-down wide-voltage circuit 423 is connected to the overvoltage protection circuit 424, and the overvoltage protection circuit 424 is connected to the undervoltage protection circuit 425;

[0057] The solenoid valve control circuit 43 is connected to the solenoid valve 5; the multiplex switch signal circuit 41 is connected to the undervoltage protection circuit 425.

[0058] Among them, the switching signal of the vehicle controller 4 adopts a multiplexer switch signal circuit 41, rather than the traditional optocoupler for the conduction and cut-off of the switching signal. The multiplexer switch signal circuit 41 can realize multi-signal acquisition, with small size, high reliability, good stability, and low power consumption;

[0059] Among them, the MOS transistor switch is used to control the solenoid valve in the vehicle controller 4, without mechanical wear, faster switching speed, no contact suction noise, no contact suction spark, and at the same time, the control current consumption of the MOS transistor is extremely small, with low power consumption; semiconductor switch control, long service life, and better able to meet the PL value requirements of EN1175:2020 for electrical components; small size, and at the same time, the MOS transistor switch control is more suitable for the whole machine with wide voltage, meeting the driving of solenoid valves with different voltage levels, reducing product models and other management costs, and has a wider application.

[0060] In a preferred embodiment, as shown in the appendix Figures 1-6 As shown, the overcurrent protection circuit 421 includes: diode D1 and zener diode D2;

[0061] The input end of the vehicle controller 4 is set as the power supply V. The power supply V is connected to the positive pole of the diode D1, the negative pole of the diode D1 is connected to the negative pole of the zener diode D2, and the positive pole of the zener diode D2 is grounded; both the positive and negative poles of the zener diode D2 are connected to the surge protection circuit 422, so as to use the diode D1 for power supply reverse connection polarity protection; use the zener diode D2 for overcurrent protection.

[0062] In a preferred embodiment, as shown in the appendix Figures 1-6 As shown, the surge protection circuit 422 includes: capacitor C1, capacitor C2, and capacitor C3;

[0063] The positive poles of the capacitor C1, capacitor C2, and capacitor C3 are all connected to the negative pole of the zener diode D2;

[0064] The positive pole of the zener diode D2, the negative pole of the capacitor C1, the negative pole of the capacitor C2, and the negative pole of the capacitor C3 are all grounded; the positive poles of the capacitor C1, capacitor C2, and capacitor C3 are connected to the step-down voltage circuit 423, so as to use the capacitors in the surge protection circuit 422 to remove the noise and clutter in the power supply and improve the power supply stability.

[0065] In a preferred embodiment, as shown in the appendix Figures 1-6 As shown, the step-down voltage circuit 423 includes: DC-DC conversion chip U1, diode D3, capacitor C4, capacitor C5, and low-voltage conversion chip U2;

[0066] The positive electrodes of capacitor C1, capacitor C2 and capacitor C3 are connected to the input terminal of DC-DC conversion chip U1. The output terminal of DC-DC conversion chip U1 is connected to the negative electrode of diode D3, the positive electrode of capacitor C4, the positive electrode of capacitor C5 and the input terminal of low-voltage conversion chip U2. One output terminal of DC-DC conversion chip U1, the positive electrode of diode D3, the negative electrode of capacitor C4 and the negative electrode of capacitor C5 are all grounded;

[0067] The output terminal of low-voltage conversion chip U2 is connected to overvoltage protection circuit 424; so as to utilize the DC-DC conversion chip U1 of step-down voltage circuit 423 to convert the 8-32V step-down voltage into a fixed 5V power supply +5V, and then it is convenient for the +5V power supply to supply power to the electrical components in vehicle controller 4 with the +5V power supply.

[0068] In a preferred embodiment, as shown in the appendix Figures 1-6 shown, overvoltage protection circuit 424 includes: zener diode D4, P-channel MOS transistor Q1 and PNP-type triode Q2;

[0069] The output terminal of low-voltage conversion chip U2 is connected to the source electrode of P-channel MOS transistor Q1 and the base electrode of PNP-type triode Q2;

[0070] The output terminal of low-voltage conversion chip U2 is connected to the negative electrode of zener diode D4 and the emitter electrode of PNP-type triode Q2 through a resistor;

[0071] The gate electrode of P-channel MOS transistor Q1 is connected to the collector electrode of PNP-type triode Q2 through a resistor. The collector electrode of PNP-type triode Q2 is grounded through a resistor, and the positive electrode of zener diode D4 is grounded;

[0072] The drain electrode of P-channel MOS transistor Q1 is connected to undervoltage protection circuit 425.

[0073] Among them, PNP-type triode Q2: The used model is S8550 triode, which is a low-power and high-current triode. It controls the current flow through the base electrode to achieve signal amplification or switch control;

[0074] Among them, P-channel MOS transistor Q1: Model FDN360P.

[0075] Among them, since the working power supply of the internal chip of vehicle controller 4 is +3.3V, the +5V power supply after passing through step-down voltage circuit 423 still needs to be stepped down. Therefore, overvoltage protection circuit 424 is utilized to prevent the power supply passing through low-voltage conversion chip U2 from being directly supplied to microcontroller U3, thus playing a role of overvoltage protection for the chip of microcontroller U3, ensuring the reliability and stability of its working power supply, and further ensuring the normal operation of vehicle controller 4;

[0076] In a preferred embodiment, as shown in the appendixFigures 1-6 As shown in the figure, the under-voltage protection circuit 425 includes: a voltage monitoring chip U4 and a single-chip microcomputer U3;

[0077] The drain of the P-channel MOS transistor Q1 is connected to the input end of the single-chip microcomputer U3 and the reset end of the voltage monitoring chip U4;

[0078] One output end of the single-chip microcomputer U3 is connected to the reset end of the voltage monitoring chip U4 and grounded through a capacitor C6, and the other output end of the single-chip microcomputer U3 is connected to the input end of the voltage monitoring chip U4 through a capacitor and grounded;

[0079] Among them, by using the under-voltage protection circuit 425, special situations are avoided after the power supply passes through the over-voltage protection circuit 424. For example: However, when the working power supply is too low, it will also cause the logic devices of the single-chip microcomputer U3 to be unstable;

[0080] Among them, the voltage monitoring chip U4 uses an under-voltage threshold voltage of 2.9V to monitor the +3.3V power supply voltage, and the output of the chip U4 is connected in parallel to the reset pin of U3.

[0081] Embodiment:

[0082] When the +3.3V power supply voltage is lower than 2.9V, the output of the voltage monitoring chip U4 always remains low level. The reset signal of the single-chip microcomputer U3 is low-level effective, and the single-chip microcomputer U3 is set to the reset state;

[0083] When the +3.3V power supply voltage is higher than 2.9V, the voltage monitoring chip U4 outputs a high level, the single-chip microcomputer U3 ends the reset state, and the single-chip microcomputer U3 enters the running state.

[0084] In a preferred embodiment, as shown in the appendix Figures 1-6 As shown in the figure, the multi-channel switch signal circuit 41 includes: a switch quantity processing module 411, a filter capacitor C7, and a multi-channel switch signal sampling chip U5;

[0085] The start switch 2 is also connected to one end of the switch quantity processing module 411 through the fuse 3. The other end of the switch quantity processing module 411 is also connected to the filter capacitor C7 and the input end of the multi-channel switch signal sampling chip U5. The other end of the filter capacitor C7 and the output end of the multi-channel switch signal sampling chip U5 are both grounded, and the other output end of the multi-channel switch signal sampling chip U5 is connected to the signal input end of the single-chip microcomputer U3.

[0086] Embodiment: When the switch quantity processing module 411 is effective, for example, when the switch quantity processing module 411 has power on the forward gear F, the power supply V enters the multi-channel switch signal sampling chip U5 through the filter capacitor C7 and the resistor, and the processed signal enters the single-chip microcomputer U3;

[0087] A method for using a wide-voltage solenoid valve control system based on MOS, including a wide-voltage solenoid valve control system based on MOS, and the specific operations are as follows:

[0088] S1: When the start switch 2 is turned to Acc, the switch quantity processing module 411 closes, and the vehicle controller 4 is powered through the fuse 3; enter S2 and S8;

[0089] The upper end of the switch quantity processing module 411 is also powered through the fuse 3; enter S7;

[0090] S2: After the vehicle controller 4 is powered, the power supply V enters the overcurrent protection circuit 421: The diode D1 performs power supply positive and negative connection polarity protection; the zener diode D2 performs overcurrent protection; then enter S3

[0091] S3: The power supply V enters the surge protection circuit 422: The capacitors C1, C2, and C3 provide surge protection; then enter S4;

[0092] Among them, the overcurrent protection of the overcurrent protection circuit 421 and the surge protection of the surge protection circuit 422 eliminate the influence of the power supply positive high-voltage surge signal on the vehicle controller 4 caused by on-site situations such as the ignition moment of the start switch 2, the failure of the whole machine generator, or load shedding, which can ensure the normal operation of the vehicle controller 4 in the above situations; and the power supply V passes through the capacitor to remove the noise and clutter in the power supply and improve the power supply stability;

[0093] S4: The power supply V enters the step-down wide-voltage circuit 423: The power supply V passes through the DC-DC conversion chip U1, and the 8-32V wide voltage is converted into a fixed 5V power supply +5V. At this time, the +5V power supply supplies power to the electrical components in the vehicle controller 4; then enter S5;

[0094] Among them, since the internal chip working power supply of the vehicle controller 4 is +3.3V, the +5V power supply after passing through the step-down wide-voltage circuit 423 still needs to be stepped down. The chip of the single-chip microcomputer U3 is the core of the entire vehicle controller 4, and the reliability and stability of its working power supply are the premise for ensuring the normal operation of the vehicle controller 4. Therefore, the power supply passing through the low-voltage conversion chip U2 cannot directly supply power to the single-chip microcomputer U3 and needs to pass through the overvoltage protection circuit 424 for overvoltage protection;

[0095] S5: The power supply V enters the overvoltage protection circuit 424: After the +5V power supply passes through the power supply of the low-voltage conversion chip U2, it is stepped down to the working voltage of the single-chip microcomputer U3, that is, +3.3V;

[0096] Judge whether the power supply of the low-voltage conversion chip U2 is lower than 3.5V or higher than 3.5V:

[0097] If it is lower than 3.5V, the PNP transistor Q2 is cut off, and the gate of the P-channel MOS transistor Q1 is always at a low level, that is, the P-channel MOS transistor Q1 is turned on, and the power supply V passes through the DS poles of the P-channel MOS transistor Q1; then it enters S6;

[0098] If it is higher than 3.5V, the PNP transistor Q2 is turned on, the power supply V passes through the PNP transistor Q2 and is grounded through a resistor, the gate voltage of the P-channel MOS transistor Q1 is pulled up, and the P-channel MOS transistor Q1 is immediately turned off, that is, the power supply V cannot pass through the P-channel MOS transistor Q1; then it enters S6;

[0099] S6: The power supply V enters the undervoltage protection circuit 425: Connect the output terminal of the voltage monitoring chip U4 to the reset terminal of the single-chip microcomputer U3; the reset signal of the single-chip microcomputer U3 is active low;

[0100] Judge whether the power supply V is lower than 2.9V or higher than 2.9V:

[0101] If it is lower than 2.9V, the output of the voltage monitoring chip U4 always remains low; the single-chip microcomputer U3 is set to the reset state;

[0102] If it is higher than 2.9V, the voltage monitoring chip U4 outputs a high level, the single-chip microcomputer U3 ends the reset state, and the single-chip microcomputer U3 enters the operating state.

[0103] S7: Judge whether the switch quantity processing module 411 is closed:

[0104] If so, the power supply V passes through the filter capacitor C7 and the resistor and then enters the multiplexer signal sampling chip U5, and the processed signal enters the single-chip microcomputer U3;

[0105] If not, return to S1;

[0106] S8: After the vehicle controller 4 is powered on, the power supply V enters the control solenoid valve circuit 43: The zener diode D5 performs power surge protection and the capacitor C8 performs surge protection. The positive and negative poles of the power supply are reversely connected through the P-channel MOS transistor Q3 for polarity switch protection, and then passes through the wide-voltage driver U6 to control the solenoid valve 5.

[0107] In a preferred embodiment, as shown in the appendix Figures 1-6 In S8, the positive and negative poles of the P-channel MOS transistor Q3 are reversely connected: Judge whether the V1 of the single-chip microcomputer U3 is at a high level or a low level:

[0108] If the V1 of the single-chip microcomputer U3 is at a high level, the optocoupler T1 is cut off, the collector output of the optocoupler is at a high level, the NPN transistor Q4 is turned on, the gate of the P-channel MOS transistor Q3 is pulled to the ground and lowered, the DS poles of the P-channel MOS transistor Q3 are turned on, and the power supply V passes through the DS poles of the P-channel MOS transistor Q3, and the solenoid valve 5 starts to attract and work;

[0109] If the signal in V1 of the microcontroller U3 is at a low level, then the optocoupler T1 conducts, the collector output of the optocoupler is at a low level, the NPN transistor Q4 is cut off, the gate of the P-channel MOS transistor Q3 is not at a low level, the DS pole of the P-channel MOS transistor Q3 is cut off, the power supply V cannot generate power through the DS pole of the P-channel MOS transistor Q3, and the solenoid valve 5 cannot work.

[0110] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0111] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wide voltage solenoid valve control system based on MOS, characterized in that: The system comprises: a power supply module (1), a start switch (2), a fuse (3), a vehicle controller (4) and a solenoid valve (5); The power supply module (1) is connected to one end of a start switch (2), the other end of the start switch (2) is connected to an input end of a vehicle controller (4) via a fuse (3), and the output end of the vehicle controller (4) is connected to a solenoid valve (5); The vehicle controller (4) includes: a multi-way switch signal circuit (41), a single chip protection circuit (42) and a control solenoid valve circuit (43); The single chip computer protection circuit (42) comprises: an overcurrent protection circuit (421), an anti-surge protection circuit (422), a voltage reduction circuit (423), an overvoltage protection circuit (424) and an undervoltage protection circuit (425); The overcurrent protection circuit (421) is connected to the anti-surge protection circuit (422), the anti-surge protection circuit (422) is connected to the width reduction voltage circuit (423), the width reduction voltage circuit (423) is connected to the overvoltage protection circuit (424), and the overvoltage protection circuit (424) is connected to the undervoltage protection circuit (425); The control solenoid valve circuit (43) is connected to the solenoid valve (5); and the multi-way switch signal circuit (41) is connected to the undervoltage protection circuit (425).

2. The MOS-based wide voltage solenoid valve control system according to claim 1, characterized in that: The overcurrent protection circuit (421) comprises: a diode D1 and a voltage stabilizing diode D2; The input end of the vehicle controller (4) is set as a power supply V, the power supply V is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the negative electrode of the voltage stabilizing diode D2, and the positive electrode of the voltage stabilizing diode D2 is grounded; the positive electrode and the negative electrode of the voltage stabilizing diode D2 are both connected to the anti-surge protection circuit (422).

3. A MOS-based wide voltage solenoid valve control system according to claim 2, characterized in that: The anti-surge protection circuit (422) comprises: a capacitor C1, a capacitor C2 and a capacitor C3; The positive electrodes of the capacitors C1, C2 and C3 are all connected to the negative electrode of the voltage stabilizing diode D2; The positive electrode of the voltage stabilizing diode D2, the negative electrode of the capacitor C1, the negative electrode of the capacitor C2 and the negative electrode of the capacitor C3 are all grounded; the positive electrodes of the capacitors C1, C2 and C3 are connected to the width reduction voltage circuit (423).

4. The MOS-based wide voltage solenoid valve control system according to claim 3, characterized in that: The voltage reduction circuit (423) comprises: a DC-DC conversion chip U1, a diode D3, a capacitor C4, a capacitor C5 and a low voltage conversion chip U2; The positive electrodes of the capacitors C1, C2 and C3 are connected to the input end of the DC-DC conversion chip U1, the output end of the DC-DC conversion chip U1 is connected to the negative electrode of the diode D3, the positive electrode of the capacitor C4, the positive electrode of the capacitor C5 and the input end of the low-voltage conversion chip U2, and an output end of the DC-DC conversion chip U1, the positive electrode of the diode D3, the negative electrode of the capacitor C4 and the negative electrode of the capacitor C5 are all grounded; The output end of the low voltage conversion chip U2 is connected to the overvoltage protection circuit (424).

5. The MOS-based wide voltage solenoid valve control system according to claim 4, characterized in that: The overvoltage protection circuit (424) comprises: a voltage stabilizing diode D4, a P-channel MOS transistor Q1 and a PNP transistor Q2; The output end of the low voltage conversion chip U2 is connected to the source of the P channel MOS transistor Q1 and the base of the PNP transistor Q2; The output end of the low voltage conversion chip U2 is connected to the cathode of the voltage stabilizing diode D4 and the emitter of the PNP transistor Q2 through a resistor; The gate of the P-channel MOS transistor Q1 is connected to the collector of the PNP transistor Q2 through a resistor, the collector of the PNP transistor Q2 is grounded through a resistor, and the positive electrode of the voltage stabilizing diode D4 is grounded; The drain of the P-channel MOS tube Q1 is connected to the undervoltage protection circuit (425).

6. The MOS-based wide voltage solenoid valve control system according to claim 5, characterized in that: The undervoltage protection circuit (425) comprises: a voltage monitoring chip U4 and a single chip microcomputer U3; The drain of the P-channel MOS tube Q1 is connected to the input terminal of the single-chip computer U3 and the reset terminal of the voltage monitoring chip U4; An output terminal of the single chip microcomputer U3 is connected to the reset terminal of the voltage monitoring chip U4 and is grounded through a capacitor C6, and another output terminal of the single chip microcomputer U3 is connected to the input terminal of the voltage monitoring chip U4 and is grounded through a capacitor.

7. The MOS-based wide voltage solenoid valve control system according to claim 6, characterized in that: The multi-way switch signal circuit (41) comprises: a switch quantity processing module (411), a filter capacitor C7 and a multi-way switch signal sampling chip U5; The start switch (2) is also connected to one end of the switch quantity processing module (411) via a fuse (3); the other end of the switch quantity processing module (411) is also connected to a filter capacitor C7 and an input end of a multi-way switch signal sampling chip U5; the other end of the filter capacitor C7 and an output end of the multi-way switch signal sampling chip U5 are both grounded; the other output end of the multi-way switch signal sampling chip U5 is connected to a signal input end of a single-chip computer U3.

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