Coil self-inductance current release device

Abstract

The invention relates to a coil self-inductance current release device which comprises a valve driving module and a release module, and the valve driving module comprises an electromagnetic valve coil and a first field effect transistor; the input end of the release module is connected with the low side of the electromagnetic valve coil, and the output end of the release module is connected with the high side of the electromagnetic valve coil; the low side of the electromagnetic valve coil is further grounded through the first field effect transistor, and the release module is at least used for releasing the self-inductance current under the condition that the first field effect transistor is turned off. The low side of the electromagnetic valve coil is connected with the input end of the release module, and the high side of the electromagnetic valve coil is connected with the output end of the release module, so that a current loop can be formed through the electromagnetic valve coil and the release module to release self-inductance current, and the self-inductance current is prevented from being damaged in the process of frequently controlling power-on and power-off of the coil. The self-inductance current frequently flows through the first field-effect tube and is released, so that the first field-effect tube is damaged, and the reliability of the valve driving module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive chassis electronic control, and particularly relates to a coil self-inductance current release device. Background Art

[0002] The automotive chassis system belongs to the underlying execution system of the vehicle. By combining various internal and external signals and responses, it controls the actuators such as motors and solenoid valves in the braking system, steering system, and suspension system, thereby affecting the vehicle body stability, driving safety, and riding comfort. The switching response speed of the solenoid valve in the automotive chassis system has an important impact on the system performance. Therefore, the braking system has a requirement for a fast response of the valve drive module, which requires the inductive control coil of the solenoid valve in the valve drive module to quickly discharge the current when powered off, so as to meet the requirement of quickly closing the solenoid valve. To meet the fast closing requirement, a field effect transistor is usually connected to the low side of the inductive control coil of the solenoid valve. The switching control circuit of the solenoid valve uses the high voltage generated by the self-induced electromotive force of its coil itself to turn on the field effect transistor connected to its low side to release the self-inductance current at the moment of coil power-off. When the self-inductance current is released to nearly 0A, the pressure relief valve closes, and this process is less than 1ms, meeting the requirement of quickly closing the pressure relief valve. However, during the frequent process of controlling the coil to be powered on and off, the high voltage generated by the coil self-inductance current at the drain of this field effect transistor will have a greater impact on the service life of the field effect transistor. The field effect transistor generates serious heat, greatly increasing the risk of damage to this field effect transistor and seriously affecting the use of the valve drive module. Summary of the Invention

[0003] In order to solve at least one of the above-mentioned technical problems, the present disclosure proposes a coil self-inductance current release device, including:

[0004] A valve drive module and a release module, the valve drive module includes a solenoid valve coil and a first field effect transistor;

[0005] The input end of the release module is connected to the low side of the solenoid valve coil, and the output end of the release module is connected to the high side of the solenoid valve coil;

[0006] The low side of the solenoid valve coil is also grounded through the first field effect transistor, and the release module is at least used to release the self-inductance current when the first field effect transistor is turned off.

[0007] In an optional embodiment, the release module includes: a first diode, a second field effect transistor, a first resistor, and a first capacitor;

[0008] The positive electrode of the first diode is connected to the low side of the solenoid valve coil, the negative electrode of the first diode is connected to the source electrode of the second field effect transistor, and the drain electrode of the second field effect transistor is connected to the high side of the solenoid valve coil;

[0009] One end of the first resistor and the first capacitor are both connected to the source electrode of the second field-effect transistor, and the other ends of the first resistor and the first capacitor are both connected to the gate electrode of the second field-effect transistor.

[0010] In an alternative embodiment, the device further includes: a threshold adjustment module;

[0011] The input end of the threshold adjustment module is connected to the power supply, and the output end of the threshold adjustment module is connected to the release module; the threshold adjustment module is used to adjust the release threshold of the release module.

[0012] In an alternative embodiment, the threshold adjustment module includes: a microcontroller, a first adjustment unit, and a second adjustment unit;

[0013] The control end of the first adjustment unit is connected to the first port of the microcontroller, the input end of the first adjustment unit is connected to the second port of the microcontroller, the output end of the second adjustment unit, and the control end of the release module, and the output end of the first adjustment unit is grounded; the input end of the second adjustment unit is connected to the power supply;

[0014] The power supply is used to supply power to the second adjustment unit. The microcontroller is used to send a turn-off signal to the first adjustment unit and send a threshold adjustment instruction to the second adjustment unit in the threshold adjustment mode. The second adjustment unit is used to generate a corresponding boost signal based on the threshold adjustment instruction and output the boost signal to the input end of the first adjustment unit, so that the turn-on voltage of the release module is equal to the first target voltage. The release module is used to release the self-inductance current when the first field-effect transistor is turned off and the voltage at the input end of the release module reaches the first target voltage.

[0015] In an alternative embodiment, the microcontroller is further used to send an on signal to the first adjustment unit and send a turn-off signal to the second adjustment unit in the high-frequency pulse width modulation control mode, so that the turn-on voltage of the release module is equal to the conduction voltage of the second field-effect transistor in the release module. The release module is further used to release the self-inductance current when the first field-effect transistor is turned off and the voltage at the input end of the release module reaches the conduction voltage.

[0016] In an alternative embodiment, the threshold adjustment module further includes: a voltage stabilization unit;

[0017] One end of the voltage stabilization unit is connected to the control end of the release module, and the other end of the voltage stabilization unit is connected to the output end of the release module;

[0018] The microcontroller is further used to send a turn-off signal to the first adjustment unit and the first adjustment unit in the fast response mode. The voltage stabilization unit is used to make the turn-on voltage of the release module equal to the second target voltage. The release module is used to release the self-inductance current when the first field-effect transistor is turned off and the voltage at the input end of the release module reaches the second target voltage.

[0019] In an alternative embodiment, the first adjustment unit includes: a first triode, a first resistor, a second resistor, a third resistor, and a second diode;

[0020] The control terminal of the first triode is connected to the first port of the microcontroller through the first resistor;

[0021] The positive electrode of the second diode is connected to the first port of the microcontroller through the second resistor, and the negative electrode of the second diode is connected to the input terminal of the first triode;

[0022] The input terminal of the first triode is further connected to the control terminal of the release module through the third resistor, and the input terminal of the first triode is also connected to the output terminal of the second adjustment unit; the output terminal of the first triode is grounded.

[0023] In an alternative embodiment, the second adjustment unit includes: a voltage follower, a first sub-control unit, a second sub-control unit, and a digital-to-analog converter;

[0024] Both the control terminal and the input terminal of the first sub-control unit are connected to the second port of the voltage follower, the output terminal of the first sub-control unit is connected to the input terminal of the second sub-control unit, and the control terminal of the first sub-control unit is also connected to the input terminal of the first adjustment unit;

[0025] The control terminal of the second sub-control unit is connected to the third port of the microcontroller, and the output terminal of the second sub-control unit is grounded;

[0026] The third port of the voltage follower is connected to the second port of the microcontroller through the second resistor;

[0027] The input terminal of the digital-to-analog converter is connected to the fourth port of the microcontroller, and the output terminal of the digital-to-analog converter is connected to the fourth port of the voltage follower.

[0028] In an alternative embodiment, the first sub-control unit includes: a second triode and a third diode;

[0029] The positive electrode of the third diode is connected to the second port of the voltage follower, and the negative electrode of the third diode is connected to the control terminal of the second triode;

[0030] The control terminal of the second triode is also connected to the second port of the voltage follower, the control terminal of the second triode is further connected to the control terminal of the release module through the third resistor, and the control terminal of the second triode is also connected to the input terminal of the first adjustment unit.

[0031] In an alternative embodiment, the second sub-control unit includes: a third triode, a fourth triode, a fourth resistor, a fifth resistor, and a sixth resistor;

[0032] The control terminal of the third triode is connected to the third port of the microcontroller through the fourth resistor. The input terminal of the third triode is connected to the control terminal of the fourth triode through the fifth resistor, and the output terminal of the third triode is grounded.

[0033] The input terminal of the fourth triode is connected to the output terminal of the first sub-control unit, and the output terminal of the fourth triode is grounded through the sixth resistor.

[0034] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure.

[0035] Implementing the present disclosure has the following beneficial effects:

[0036] A coil self-inductance current release device includes a valve drive module and a release module. The valve drive module includes a solenoid valve coil and a first field-effect transistor. The input terminal of the release module is connected to the low side of the solenoid valve coil, and the output terminal of the release module is connected to the high side of the solenoid valve coil. The low side of the solenoid valve coil is also grounded through the first field-effect transistor. The release module is at least used to release the self-inductance current when the first field-effect transistor is turned off.

[0037] By connecting the input terminal of the release module to the low side of the solenoid valve coil and the output terminal of the release module to the high side of the solenoid valve coil, the present disclosure can form a current loop through the solenoid valve coil and the release module to release the self-inductance current, preventing the damage of the first field-effect transistor caused by the frequent flow of the self-inductance current through the first field-effect transistor during the frequent control of the coil's power on and off, thereby improving the reliability of the valve drive module.

[0038] According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present disclosure will become clear. Brief Description of the Drawings

[0039] To more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing the embodiments in line with the present disclosure, and are used together with the specification to explain the principles of the present disclosure, and do not constitute an improper limitation to the present disclosure.

[0040] Figure 1 It is a module schematic diagram of a coil self-inductance current release device shown according to an exemplary embodiment;

[0041] Figure 2It is a schematic diagram of the components of a threshold adjustment module 3 shown according to an exemplary embodiment;

[0042] Figure 3 It is another schematic diagram of the components of a threshold adjustment module 3 shown according to an exemplary embodiment;

[0043] Figure 4 It is a schematic diagram of the circuit connection of a coil self-inductance current release device shown according to an exemplary embodiment;

[0044] The following is a supplementary description of the drawings:

[0045] 1 - Valve drive module; 11 - Solenoid valve coil; 12 - First field effect transistor; 13 - Third field effect transistor; 2 - Release module; 21 - First diode; 22 - Second field effect transistor; 23 - First resistor; 24 - First capacitor; 3 - Threshold adjustment module; 31 - Microcontroller; 32 - First adjustment unit; 321 - First triode; 322 - First resistor; 323 - Second resistor; 324 - Third resistor; 325 - Second diode; 33 - Second adjustment unit; 331 - Voltage follower; 332 - First sub-control unit; 3321 - Second triode; 3322 - Third diode; 333 - Second sub-control unit; 3331 - Third triode; 3332 - Fourth triode; 3333 - Fourth resistor; 3334 - Fifth resistor; 3335 - Sixth resistor; 334 - Digital-to-analog converter; 34 - Voltage stabilization unit. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of this specification will be clearly and completely described in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, device, system, product, or server that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, devices, products, or equipment.

[0048] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. Like reference numerals in the drawings denote functionally identical or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified. The term "exemplary" as used herein means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments.

[0049] As used herein, the term "and / or" merely describes an associative relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" as used herein means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set consisting of A, B, and C.

[0050] In addition, to better illustrate the present disclosure, numerous specific details are given in the following detailed description. Those skilled in the art should understand that the present disclosure can be implemented without some specific details. In some instances, devices, means, elements, and circuits well known to those skilled in the art are not described in detail so as to highlight the gist of the present disclosure.

[0051] Figure 1 is a schematic diagram of a module of a coil self-inductance current release device shown according to an exemplary embodiment, as Figure 1 shown, the coil self-inductance current release device includes a valve drive module 1 and a release module 2, wherein,

[0052] The valve drive module 1 includes a solenoid valve coil 11 and a first field-effect transistor 12; the input end of the release module 2 is connected to the low side of the solenoid valve coil 11, and the output end of the release module 2 is connected to the high side of the solenoid valve coil 11; the low side of the solenoid valve coil 11 is also grounded through the first field-effect transistor 12, and the release module 2 is at least used to release the self-inductance current when the first field-effect transistor 12 is turned off.

[0053] In an embodiment of the present disclosure, as Figure 4As shown, the valve driving module 1 further includes a third field effect transistor 13 and a power supply Vbat. Both the first field effect transistor 12 and the third field effect transistor 13 are MOS transistors. The drain (D terminal) of the third field effect transistor 13 is connected to the power supply Vbat, the source (S terminal) of the third field effect transistor 13 is connected to the high side of the solenoid valve coil 11, the low side of the solenoid valve coil 11 is connected to the drain (D terminal) of the first field effect transistor 12, the source (S terminal) of the first field effect transistor 12 is grounded (GND), and the gates (G terminals) of the first field effect transistor 12 and the third field effect transistor 13 are both used to receive corresponding control signals. The energization process of the valve driving module 1 is to first turn on the third field effect transistor 13 on the high side to make the upper end of the solenoid valve coil 11 energized. After a certain time delay, the first field effect transistor 12 on the low side is turned on. At this time, there is current flowing through the solenoid valve coil 11.

[0054] In the embodiment of the present disclosure, the input end of the release module 2 is connected to the low side of the solenoid valve coil 11, and the output end of the release module 2 is connected to the high side of the solenoid valve coil 11. The power-off process is to keep the third field effect transistor 13 on the high side open. After the first field effect transistor 12 on the low side is turned off, the self-induced current generated by the solenoid valve coil 11 due to power-off is released through the current loop formed by the solenoid valve coil 11 and the release module 2.

[0055] Based on the above, in the embodiment of the present disclosure, by connecting the input end of the release module to the low side of the solenoid valve coil and connecting the output end of the release module to the high side of the solenoid valve coil, a current loop can be formed by the solenoid valve coil and the release module to release the self-induced current, preventing the first field effect transistor from being damaged due to the frequent flow of the self-induced current through the first field effect transistor during the frequent control of the coil's power-on and power-off process, thereby improving the reliability of the valve driving module.

[0056] In an optional embodiment, as Figure 4 shown, the release module 2 includes: a first diode 21, a second field effect transistor 22, a first resistor 23, and a first capacitor 24; the positive electrode of the first diode 21 is connected to the low side of the solenoid valve coil 11, the negative electrode of the first diode 21 is connected to the source (S terminal) of the second field effect transistor 22, and the drain (D terminal) of the second field effect transistor 22 is connected to the high side of the solenoid valve coil 11; one ends of the first resistor 23 and the first capacitor 24 are both connected to the source of the second field effect transistor 22, and the other ends of the first resistor 23 and the first capacitor 24 are both connected to the gate (G terminal) of the second field effect transistor 22.

[0057] In the embodiment of the present disclosure, the second field effect transistor 22 is a MOS transistor, and the first resistor 23 and the first capacitor 24 are a G-S bias resistor and a filter capacitor respectively. When the second field effect transistor 22 is turned on, the self-induced current can be released through the current loop formed by the second field effect transistor 22 and the solenoid valve coil 11 to achieve the purpose of releasing the self-induced current.

[0058] Based on the above, in the embodiments of the present disclosure, by setting the first diode 21 in the release module 2, the reverse flow of current can be prevented; by connecting the drain of the second field effect transistor 22 to the high side of the solenoid valve coil 11, and connecting one ends of the first resistor 23 and the first capacitor 24 to the source of the second field effect transistor 22, and connecting the other ends of the first resistor 23 and the first capacitor 24 to the gate of the second field effect transistor 22, the self-induced current can be released through the current loop formed by the second field effect transistor 22 and the solenoid valve coil 11, playing a role in protecting the first field effect transistor 12.

[0059] In an alternative embodiment, as Figure 1 shown, the device further includes: a threshold adjustment module 3.

[0060] The input end of the threshold adjustment module 3 is connected to the power supply, and the output end of the threshold adjustment module 3 is connected to the release module 2; the threshold adjustment module 3 is used to adjust the release threshold of the release module 2.

[0061] Based on the above, in the embodiments of the present disclosure, by setting the threshold adjustment module 3 connected to the release module 2, the release threshold of the release module 2 can be adjusted, so that the turn-on voltage of the release module 2 can be adjusted according to different control modes, and further the release of the self-induced current can adapt to different control requirements.

[0062] In an alternative embodiment, as Figure 2 shown, the threshold adjustment module 3 includes: a microcontroller 31, a first adjustment unit 32 and a second adjustment unit 33; the control end of the first adjustment unit 32 is connected to the first port of the microcontroller 31, the input end of the first adjustment unit 32 is connected to the second port of the microcontroller 31, the output end of the second adjustment unit 33 and the control end of the release module 2, and the output end of the first adjustment unit 32 is grounded; the input end of the second adjustment unit 33 is connected to the power supply.

[0063] In the embodiments of the present disclosure, the microcontroller 31 has at least four control ports, namely a first port A1, a second port A2, a third port A3, and a fourth port A4. The four control ports independently send control signals to the components connected thereto. The control end of the first adjustment unit 32 is connected to the first port of the microcontroller 31, and the first port of the microcontroller 31 is used to control the turning on or off of the first adjustment unit 32; the input end of the first adjustment unit 32 is connected to the second port of the microcontroller 31, the output end of the second adjustment unit 33, and the control end of the release module 2, so that the input end of the first adjustment unit 32 can receive a boost signal from the second port of the microcontroller 31 or the output end of the second adjustment unit 33, and transfer the boost signal to the control end of the release module 2 when it is turned off itself; the output end of the first adjustment unit 32 is grounded, so that the boost signal received from the second port of the microcontroller 31 or the output end of the second adjustment unit 33 when the first adjustment unit 32 is turned on is directly introduced into the ground wire, so as not to affect the control end of the release module 2; the input end of the second adjustment unit 33 is connected to a power supply, and this power supply is the power supply Vbat for the valve drive module 1.

[0064] In an alternative embodiment, as Figure 4 shown, the first adjustment unit 32 includes: a first triode 321, a first resistor 322, a second resistor 323, a third resistor 324, and a second diode 325; the control end of the first triode 321 is connected to the first port of the microcontroller 31 through the first resistor 322; the positive electrode of the second diode 325 is connected to the first port of the microcontroller 31 through the second resistor 323, and the negative electrode of the second diode 325 is connected to the input end of the first triode 321; the input end of the first triode 321 is further connected to the control end of the release module 2 through the third resistor 324, and the input end of the first triode 321 is further connected to the output end of the second adjustment unit 33; the output end of the first triode 321 is grounded.

[0065] In the embodiment of the present disclosure, the first triode 321 is an NPN-type triode. The control terminal of the first triode 321 is the base, the input terminal of the first triode 321 is the collector, and the output terminal of the first triode 321 is the emitter. One end of the first resistor 322 is connected to the base of the first triode 321, and the other end of the first resistor 322 is connected to the first port A1 of the microcontroller 31. One end of the second resistor 323 is connected to the positive electrode of the second diode 325, and the other end of the second resistor 323 is connected to the first port A1 of the microcontroller 31. The negative electrode of the second diode 325 is connected to the collector of the first triode 321. One end of the third resistor 324 is connected to the collector of the first triode 321, and the other end of the third resistor 324 is connected to the gate (G terminal) of the second field effect transistor 22. The collector of the first triode 321 is also connected to the output terminal of the second adjustment unit 33, and the emitter of the first triode 321 is grounded.

[0066] Based on the above, in the embodiment of the present disclosure, by connecting the control terminal of the first triode 321 to the first port of the microcontroller 31 through the first resistor 322, connecting the positive electrode of the second diode 325 to the first port of the microcontroller 31 through the second resistor 323, connecting the negative electrode of the second diode 325 to the input terminal of the first triode 321, connecting the input terminal of the first triode 321 to the control terminal of the release module 2 through the third resistor 324, connecting the input terminal of the first triode 321 to the output terminal of the second adjustment unit 33, and grounding the output terminal of the first triode 321, the threshold adjustment instruction of the threshold adjustment module 3 can be reflected to the control terminal of the release module 2 by controlling the on / off of the first triode 321.

[0067] In an alternative embodiment, as Figure 3 shown, the second adjustment unit 33 includes: a voltage follower 331, a first sub-control unit 332, a second sub-control unit 333, and a digital-to-analog converter 334. The control terminal and the input terminal of the first sub-control unit 332 are both connected to the second port of the voltage follower 331. The output terminal of the first sub-control unit 332 is connected to the input terminal of the second sub-control unit 333. The control terminal of the first sub-control unit 332 is also connected to the input terminal of the first adjustment unit 32. The control terminal of the second sub-control unit 333 is connected to the third port of the microcontroller 31, and the output terminal of the second sub-control unit 333 is grounded. The third port of the voltage follower 331 is connected to the second port of the microcontroller 31 through the second resistor 323. The input terminal of the digital-to-analog converter 334 is connected to the fourth port of the microcontroller 31, and the output terminal of the digital-to-analog converter 334 is connected to the fourth port of the voltage follower 331.

[0068] In the embodiments of the present disclosure, the voltage follower (Tracker) 331 includes at least four ports, namely a first port B1, a second port B2, a third port B3, and a fourth port B4. The first port B1 of the voltage follower 331 is connected to the power supply Vbat.

[0069] In the embodiments of the present disclosure, the full name of the digital-to-analog converter is Digital / Analog Converter (DAC). The input end of the digital-to-analog converter 334 is the C2 port, and the output end of the digital-to-analog converter 334 is the C1 port. The digital-to-analog converter 334 is used to provide the reference voltage Vref to the voltage follower 331.

[0070] In an alternative embodiment, as Figure 4 shown, the first sub-control unit 332 includes: a second triode 3321 and a third diode 3322; the positive electrode of the third diode 3322 is connected to the second port of the voltage follower 331, and the negative electrode of the third diode 3322 is connected to the control end of the second triode 3321; the control end of the second triode 3321 is also connected to the second port of the voltage follower 331. The control end of the second triode 3321 is also connected to the control end of the release module 2 through a third resistor 324, and the control end of the second triode 3321 is also connected to the input end of the first adjustment unit 32.

[0071] In the embodiments of the present disclosure, the second triode 3321 is an NPN-type triode. The control end of the second triode 3321 is the base, the input end of the second triode 3321 is the collector, and the output end of the second triode 3321 is the emitter. The positive electrode of the third diode 3322 is connected to the second port B2 of the voltage follower 331, and the negative electrode of the third diode 3322 is connected to the base of the second triode 3321; the base of the second triode 3321 is also connected to the second port B2 of the voltage follower 331. One end of the third resistor 324 is connected to the base of the second triode 3321, and the other end of the third resistor 324 is connected to the gate (G terminal) of the second field effect transistor 22. The base of the second triode 3321 is also connected to the collector of the first triode 321.

[0072] Based on the above, in the embodiments of the present disclosure, by connecting the positive electrode of the third diode 3322 to the second port of the voltage follower 331, the negative electrode of the third diode 3322 to the control end of the second triode 3321, the control end of the second triode 3321 to the second port of the voltage follower 331, the control end of the second triode 3321 to the control end of the release module 2 through the third resistor 324, and the control end of the second triode 3321 to the input end of the first adjustment unit 32, the transmission and adjustment of the control signal can be achieved through the above connection relationship.

[0073] In an alternative embodiment, asFigure 4 As shown in Figure 4 , the second sub-control unit 333 includes: a third triode 3331, a fourth triode 3332, a fourth resistor 3333, a fifth resistor 3334, and a sixth resistor 3335. The control terminal of the third triode 3331 is connected to the third port of the microcontroller 31 through the fourth resistor 3333. The input terminal of the third triode 3331 is connected to the control terminal of the fourth triode 3332 through the fifth resistor 3334. The output terminal of the third triode 3331 is grounded. The input terminal of the fourth triode 3332 is connected to the output terminal of the first sub-control unit 332. The output terminal of the fourth triode 3332 is grounded through the sixth resistor 3335.

[0074] In the embodiment of the present disclosure, the third triode 3331 is an NPN-type triode. The control terminal of the third triode 3331 is the base. The input terminal of the third triode 3331 is the collector. The output terminal of the third triode 3331 is the emitter. The fourth triode 3332 is a PNP-type triode. The control terminal of the fourth triode 3332 is the base. The input terminal of the fourth triode 3332 is the emitter. The output terminal of the fourth triode 3332 is the collector. One end of the fourth resistor 3333 is connected to the base of the third triode 3331, and the other end of the fourth resistor 3333 is connected to the third port A3 of the microcontroller 31. One end of the fifth resistor 3334 is connected to the collector of the third triode 3331, and the other end of the fifth resistor 3334 is connected to the base of the fourth triode 3332. The emitter of the third triode 3331 is grounded. The emitter of the fourth triode 3332 is connected to the emitter of the second triode 3321. The collector of the fourth triode 3332 is grounded through the sixth resistor 3335.

[0075] Based on the above, in the embodiment of the present disclosure, by connecting the control terminal of the third triode 3331 to the third port of the microcontroller 31 through the fourth resistor 3333, connecting the input terminal of the third triode 3331 to the control terminal of the fourth triode 3332 through the fifth resistor 3334, and grounding the output terminal of the third triode 3331; connecting the input terminal of the fourth triode 3332 to the output terminal of the first sub-control unit 332, and grounding the output terminal of the fourth triode 3332 through the sixth resistor 3335, the transmission and adjustment of the control signal can be realized through the above connection relationship.

[0076] In an optional embodiment, a power supply is used to supply power to the second regulating unit 33. The microcontroller 31 is used to send a turn-off signal to the first regulating unit 32 and send a threshold regulating instruction to the second regulating unit 33 in the threshold regulating mode. The second regulating unit 33 is used to generate a corresponding boost signal based on the threshold regulating instruction and output the boost signal to the input end of the first regulating unit 32, so that the turn-on voltage of the release module 2 is equal to the first target voltage. The release module 2 is used to release the self-inductance current when the first field-effect transistor 12 is turned off and the voltage at the input end of the release module 2 reaches the first target voltage.

[0077] In the embodiment of the present disclosure, the working principle of the coil self-inductance current release device in the threshold regulating mode is as follows: The turn-on voltage of the second field-effect transistor 22 in the release module 2 itself is Vth, and the base voltage of the second triode 3321 is Vq2_b. Then, the minimum S-terminal voltage for turning on the second field-effect transistor 22 is Vth + Vq2_b. Therefore, adjusting the base voltage of the second triode 3321 can change the minimum S-terminal voltage for turning on the second field-effect transistor 22. Since the S-terminal voltage is generated by the self-inductance current when the coil is powered off, the purpose of adjusting the release threshold of the coil self-inductance current is indirectly achieved. The specific working process is as follows: When the system is powered on, the microcontroller 31 sets the A1 port to low, and the first triode 321 is turned off; the microcontroller 31 enables the digital-to-analog converter 334 through the A4 port and makes the digital-to-analog converter 334 output the reference voltage Vref; the microcontroller 31 sets the A2 and A3 ports to high, enabling the voltage follower 331 and the current source composed of the first sub-control unit 332 and the second sub-control unit 333; the conduction voltage drop of the third diode 3322 is Vd3, then the base voltage Vq2_b of the second triode 3321 is Vref - Vd3. Then, the minimum S-terminal voltage for turning on the second field-effect transistor 22, that is, the first target voltage, is Vth + Vref - Vd3. The self-inductance current is released when the first field-effect transistor 12 is turned off and the S-terminal voltage of the second field-effect transistor 22 reaches the first target voltage. In the actual control process, the Vref voltage can be adjusted in real time according to requirements to achieve the purpose of adjusting the release threshold of the coil self-inductance current in real time, thereby changing the response performance of the solenoid valve. Optionally, in the threshold regulating mode, the first field-effect transistor 12 is automatically turned off.

[0078] Based on the above, in the embodiments of the present disclosure, by connecting the control end of the first adjustment unit 32 to the first port of the microcontroller 31, connecting the input end of the first adjustment unit 32 to the second port of the microcontroller 31, the output end of the second adjustment unit 33, and the control end of the release module 2, and grounding the output end of the first adjustment unit 32, it is possible to realize that the microcontroller 31 sends a turn-off signal to the first adjustment unit 32 and sends a threshold adjustment instruction to the second adjustment unit 33, and the second adjustment unit 33 generates a corresponding boost signal to make the turn-on voltage of the release module 2 equal to the first target voltage, so as to realize the release of the self-inductance current when the voltage at the input end of the release module 2 reaches the first target voltage.

[0079] In an alternative embodiment, the microcontroller 31 is further configured to send an on signal to the first adjustment unit 32 and a turn-off signal to the second adjustment unit 33 in the high-frequency pulse width modulation control mode, so that the turn-on voltage of the release module 2 is equal to the conduction voltage of the second field effect transistor 22 in the release module 2. The release module 2 is further configured to release the self-inductance current when the first field effect transistor 12 is turned off and the voltage at the input end of the release module 2 reaches the conduction voltage.

[0080] In the embodiments of the present disclosure, in the high-frequency pulse width modulation control mode, the working principle of the coil self-inductance current release device in the threshold adjustment mode is as follows: When the system is powered on, the A1 port of the microcontroller 31 is set high. After the first adjustment unit 32 receives the on signal, it conducts, and the enable port B3 of the voltage follower 331 and the base level of the second triode 3321 are pulled low. At the same time, the A2 port of the microcontroller 31 is set low, and the second sub-control unit 333 is turned off to make the voltage output from the threshold adjustment module 3 to the input end of the release module 2 be 0. At this time, the turn-on voltage of the release module 2 is equal to the conduction voltage Vth of the second field effect transistor 22 itself in the release module 2. The self-inductance current of the solenoid valve coil 11 causes the voltage at the drain (D terminal) of the first field effect transistor 12 to rise. When this voltage reaches the conduction voltage Vth of the second field effect transistor 22, the second field effect transistor 22 conducts to release the self-inductance current. Optionally, in the high-frequency pulse width modulation control mode, the first field effect transistor 12 is automatically turned off.

[0081] Based on the above, in the embodiments of the present disclosure, by the microcontroller 31 sending an on signal to the first adjustment unit 32 and a turn-off signal to the second adjustment unit 33, it is possible to make the turn-on voltage of the release module 2 equal to the conduction voltage of the second field effect transistor 22 in the release module 2, and realize the release of the self-inductance current when the voltage at the input end of the release module 2 reaches the conduction voltage.

[0082] In an alternative embodiment, as Figure 2 or Figure 3As shown, the threshold adjustment module 3 further includes: a voltage stabilization unit 34; one end of the voltage stabilization unit 34 is connected to the control end of the release module 2, and the other end of the voltage stabilization unit 34 is connected to the output end of the release module 2.

[0083] In the embodiments of the present disclosure, as Figure 4 shown, the voltage stabilization unit 34 is a voltage stabilizing diode. One end of the voltage stabilization unit 34 is connected to the gate (G terminal) of the second field effect transistor 22 in the release module 2, and the other end is connected to the drain (D terminal) of the second field effect transistor 22 in the release module 2.

[0084] The microcontroller 31 is further configured to send a turn-off signal to the first adjustment unit 32 and the first adjustment unit 32 in the fast response mode. The voltage stabilization unit 34 is configured to make the turn-on voltage of the release module 2 equal to the second target voltage. The release module 2 is configured to release the self-inductance current when the first field effect transistor 12 is turned off and the voltage at the input end of the release module 2 reaches the second target voltage.

[0085] In the embodiments of the present disclosure, in the fast response mode, the working principle of the coil self-inductance current release device in the threshold adjustment mode is as follows: The microcontroller 31 sets the ports A1, A2, A3, and A4 to low, and makes the reference voltage Vref output by the DAC be 0. The first adjustment unit 32 and the first adjustment unit 32 are turned off. The voltage at the gate (G terminal) of the second field effect transistor 22 is the supply voltage Vbat of the power supply plus the voltage stabilizing voltage Vz of the voltage stabilizing diode. At this time, the turn-on voltage of the release module 2 becomes the second target voltage Vbat + Vz + Vth. When the first field effect transistor 12 is turned off and the voltage at the input end of the release module 2, that is, the voltage at the source of the second field effect transistor 22, reaches the second target voltage, the self-inductance current is released.

[0086] Based on the above, in the embodiments of the present disclosure, by setting the voltage stabilization unit 34, the function of adjusting the release threshold of the release module 2 can be achieved, so that the turn-on voltage of the release module 2 becomes the second target voltage Vbat + Vz + Vth, thereby realizing forced fast response and improving the response speed of the solenoid valve.

[0087] In the embodiments of the present application, the term "module" or "unit" refers to a computer program with a predetermined function or a part of a computer program, which works together with other related parts to achieve a predetermined goal, and can be fully or partially implemented by using software, hardware such as a processing circuit or a memory, or a combination thereof. Similarly, one processor or multiple processors or memories can be used to implement one or more modules or units. In addition, each module or unit can be a part of the overall module or unit that includes the function of the module or unit.

[0088] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the claims.

[0089] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A coil self-inductance current release device, characterized in that: include: A valve drive module (1) and a release module (2), wherein the valve drive module (1) comprises a solenoid valve coil (11) and a first field effect transistor (12); The input end of the release module (2) is connected to the low side of the solenoid valve coil (11), and the output end of the release module (2) is connected to the high side of the solenoid valve coil (11); The low side of the solenoid valve coil (11) is also grounded via the first field effect transistor (12), and the release module (2) is at least used to release the self-inductance current when the first field effect transistor (12) is turned off.

2. The device according to claim 1, characterized in that The release module (2) comprises: a first diode (21), a second field effect transistor (22), a first resistor (23) and a first capacitor (24); The positive electrode of the first diode (21) is connected to the low side of the solenoid valve coil (11), the negative electrode of the first diode (21) is connected to the source electrode of the second field effect transistor (22), and the drain electrode of the second field effect transistor (22) is connected to the high side of the solenoid valve coil (11); One end of the first resistor (23) and the first capacitor (24) are both connected to the source of the second field effect transistor (22), and the other end of the first resistor (23) and the first capacitor (24) are both connected to the gate of the second field effect transistor (22).

3. The device according to claim 1, characterized in that The device further comprises: a threshold adjustment module (3); The input end of the threshold adjustment module (3) is connected to a power supply, and the output end of the threshold adjustment module (3) is connected to the release module (2); the threshold adjustment module (3) is used to adjust the release threshold of the release module (2).

4. The device according to claim 3, characterized in that The threshold adjustment module (3) comprises: a microcontroller (31), a first adjustment unit (32) and a second adjustment unit (33); The control end of the first regulating unit (32) is connected to the first port of the microcontroller (31), the input end of the first regulating unit (32) is connected to the second port of the microcontroller (31), the output end of the second regulating unit (33) and the control end of the release module (2), the output end of the first regulating unit (32) is grounded; the input end of the second regulating unit (33) is connected to a power supply; The power supply is used to supply power to the second regulating unit (33); the microcontroller (31) is used to send a shutdown signal to the first regulating unit (32) and a threshold regulation instruction to the second regulating unit (33) in a threshold regulation mode; the second regulating unit (33) is used to generate a corresponding boost signal based on the threshold regulation instruction and output the boost signal to the input end of the first regulating unit (32) so that the start-up voltage of the release module (2) is equal to a first target voltage; the release module (2) is used to release the self-inductance current when the first field effect transistor (12) is turned off and the voltage at the input end of the release module (2) reaches the first target voltage.

5. The device according to claim 4, characterized in that: The microcontroller (31) is further used to send a start signal to the first regulating unit (32) and a shutoff signal to the second regulating unit (33) in a high-frequency pulse width modulation control mode, so that the start voltage of the release module (2) is equal to the conduction voltage of the second field effect tube (22) in the release module (2); the release module (2) is further used to release the self-inductance current when the first field effect tube (12) is turned off and the voltage at the input end of the release module (2) reaches the conduction voltage.

6. The device according to claim 4, characterized in that The threshold adjustment module (3) further comprises: a voltage stabilization unit (34); One end of the voltage stabilizing unit (34) is connected to the control end of the release module (2), and the other end of the voltage stabilizing unit (34) is connected to the output end of the release module (2); The microcontroller (31) is also used to send a shutdown signal to the first regulating unit (32) and the first regulating unit (32) in a fast response mode, the voltage stabilizing unit (34) is used to make the start voltage of the release module (2) equal to a second target voltage, and the release module (2) is used to release the self-inductance current when the first field effect transistor (12) is turned off and the voltage at the input end of the release module (2) reaches the second target voltage.

7. The device according to claim 4, characterized in that The first regulating unit (32) comprises: a first triode (321), a first resistor (322), a second resistor (323), a third resistor (324) and a second diode (325); The control end of the first transistor (321) is connected to the first port of the microcontroller (31) via the first resistor (322); The anode of the second diode (325) is connected to the first port of the microcontroller (31) through the second resistor (323), and the cathode of the second diode (325) is connected to the input end of the first transistor (321); The input end of the first triode (321) is also connected to the control end of the release module (2) via the third resistor (324), and the input end of the first triode (321) is also connected to the output end of the second regulating unit (33); the output end of the first triode (321) is grounded.

8. The device according to claim 4, characterized in that The second regulating unit (33) comprises: a voltage follower (331), a first sub-control unit (332), a second sub-control unit (333) and a digital-to-analog converter (334); The control end and the input end of the first sub-control unit (332) are both connected to the second port of the voltage follower (331), the output end of the first sub-control unit (332) is connected to the input end of the second sub-control unit (333), and the control end of the first sub-control unit (332) is also connected to the input end of the first regulating unit (32); A control end of the second sub-control unit (333) is connected to a third port of the microcontroller (31), and an output end of the second sub-control unit (333) is grounded; The third port of the voltage follower (331) is connected to the second port of the microcontroller (31) via a second resistor (323); The input end of the digital-to-analog converter (334) is connected to the fourth port of the microcontroller (31), and the output end of the digital-to-analog converter (334) is connected to the fourth port of the voltage follower (331).

9. The device according to claim 8, characterized in that The first sub-control unit (332) comprises: a second triode (3321) and a third diode (3322); The anode of the third diode (3322) is connected to the second port of the voltage follower (331), and the cathode of the third diode (3322) is connected to the control end of the second transistor (3321); The control end of the second transistor (3321) is also connected to the second port of the voltage follower (331), the control end of the second transistor (3321) is also connected to the control end of the release module (2) via a third resistor (324), and the control end of the second transistor (3321) is also connected to the input end of the first regulating unit (32).

10. The device according to claim 8, characterized in that The second sub-control unit (333) comprises: a third triode (3331), a fourth triode (3332), a fourth resistor (3333), a fifth resistor (3334) and a sixth resistor (3335); The control end of the third triode (3331) is connected to the third port of the microcontroller (31) via the fourth resistor (3333), the input end of the third triode (3331) is connected to the control end of the fourth triode (3332) via the fifth resistor (3334), and the output end of the third triode (3331) is grounded; The input end of the fourth transistor (3332) is connected to the output end of the first sub-control unit (332), and the output end of the fourth transistor (3332) is grounded via the sixth resistor (3335).

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