High-reliability intelligent multi-way valve driving and control circuit based on CAN communication

Abstract

The invention provides a high-reliability intelligent multi-way valve driving and control circuit based on CAN communication. The high-reliability intelligent multi-way valve driving and control circuit comprises an ADC collection module, a main control chip, a CAN communication module and a 24V PWM output module. The ADC acquisition module comprises a displacement acquisition chip, a standby displacement acquisition chip, a signal one-out-of-two optocoupler isolation module and a signal one-out-of-three optocoupler isolation module; according to the multi-way valve, multi-dimensional information fusion and transmission are combined into the driving and control process of the multi-way valve from the circuit level, and intelligent improvement of the multi-way valve is achieved; and starting from the aspects of information acquisition reliability, communication reliability, valve element control reliability and the like, high-reliability driving and control of the intelligent multi-way valve are realized through a signal redundancy and backup method.

Description

Technical Field

[0001] The present invention belongs to the technical field of multi-way valves, relates to intelligent hydraulic valve components and control, and specifically relates to a highly reliable intelligent multi-way valve drive and control circuit based on CAN communication. Background Art

[0002] Multi-way valves are widely used in assembly lines, mining machinery, agricultural machinery and other fields. With the improvement of intelligence and information level, as well as the increase in demand for refined operations, traditional multi-way valves have been unable to meet the needs of various types of engineering machinery and assembly lines due to their low automation / intelligence and less work status information collection. The demand for intelligent multi-way valves is increasing rapidly. On the other hand, with the improvement of mechanical work efficiency, component damage will lead to more serious economic losses, so high requirements are also placed on the reliability of intelligent multi-way valves.

[0003] Regarding the reliability of multi-way valves, a Chinese invention patent with application publication number CN112664704A mentions a solenoid valve circuit overcurrent protection method, which can improve the reliability of multi-way solenoid valves to a certain extent, but its application object is mainly multi-way solenoid valves, and the control logic is simple, which is not suitable for intelligent multi-way valves. Existing intelligent multi-way valves have made many improvements in intelligent information collection, intelligent control and other aspects of multi-way valves. However, there is little research on the reliability problems caused by adding electronic components in the process of multi-way valve intelligence, and research on the circuit design of highly reliable intelligent multi-way valves is even scarcer. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a highly reliable intelligent multi-way valve drive and control circuit based on CAN communication, so as to solve the technical problem that the reliability of the intelligent multi-way valve drive and control in the prior art needs to be further improved.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A highly reliable intelligent multi-way valve driving and control circuit based on CAN communication comprises an ADC acquisition module, a main control chip, a CAN communication module and a 24VPWM output module.

[0007] The ADC acquisition module includes a displacement acquisition chip, a spare displacement acquisition chip, a signal two-choice optocoupler isolation module and a signal three-choice optocoupler isolation module; the input ends of the displacement acquisition chip and the spare displacement acquisition chip are both used to acquire the signal of the valve core displacement sensor; the input ends of the displacement acquisition chip and the spare displacement acquisition chip are respectively connected to the input ends of the signal two-choice module; the first input end of the signal three-choice optocoupler isolation module is connected to the output end of the signal two-choice module; the second input end of the signal three-choice optocoupler isolation module is used to acquire the signal of pressure sensor 1; the third input end of the signal three-choice optocoupler isolation module is used to acquire the signal of pressure sensor 2.

[0008] The main control chip includes at least 4 analog quantity acquisition ports, which are ADC1 port, ADC2 port, ADC3 port and ADC4 port respectively; the ADC1 port is connected to the output end of the signal two-choice module; the ADC2 port is used to collect the signal of pressure sensor 1; the ADC3 port is used to collect the signal of pressure sensor 2; the ADC4 port is connected to the output end of the signal three-choice optical coupling isolation module.

[0009] The CAN communication module includes a 2-way CAN communication module 1 and a CAN communication module 2.

[0010] The main control chip comprises at least two communication ports, which are a CAN1 port and a CAN2 port; the CAN1 port is connected to the CAN communication module 1 for communication.

[0011] The main control chip includes at least two output ports, which are a PWM1 port and a PWM2 port respectively; the PWM1 port and the PWM2 port are respectively connected to the input end of the 24VPWM output module.

[0012] The present invention also has the following technical features:

[0013] The main control chip is STM32F103.

[0014] When one of the ADC1 port, ADC2 port and ADC3 port in the main control chip is damaged, the main control chip controls the signal three-to-one optocoupler isolation module through the IO port, and outputs the signal corresponding to the damaged ADC port at the output end of the signal three-to-one optocoupler isolation module.

[0015] The displacement acquisition chip and the spare displacement acquisition chip are both displacement acquisition chips of model TLC2275AID.

[0016] The external interfaces of the CAN communication module 1 and the CAN communication module 2 are both provided with a self-resetting fuse SMD012-1206.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] (I) The present invention combines multi-dimensional information fusion and transmission into the driving and control process of the multi-way valve from the circuit level, thereby realizing the intelligentization of the multi-way valve; and starting from the aspects of information collection reliability, communication reliability and valve core control reliability, through signal redundancy and backup methods, the highly reliable driving and control of the intelligent multi-way valve is realized.

[0019] (II) The multi-way valve driving and control circuit of the present invention sets a redundant port in the multi-way valve working status acquisition port. When the control program in the main control chip detects that the port is damaged, it can automatically switch to ensure that the damaged port signal can be restored in a short time. At the same time, for the more critical valve core displacement signal, a spare displacement acquisition chip is set to achieve reliable acquisition of the valve core displacement signal. Through the above two methods, the reliability of the signal acquisition process is improved.

[0020] (III) On the other hand, in the CAN communication module, by designing two CAN communication chips, multiple CAN communication channels exist in the main control chip; at the same time, in the connection between the external communication equipment and the multi-way valve, a more reliable CAN communication topology network structure is adopted, so that each CAN communication chip is connected to all devices; on the other hand, in order to prevent the external CAN communication equipment from being damaged and causing the intelligent multi-way valve CAN communication chip to break down, a self-recovery fuse is provided at the connection between the CAN communication chip and the external CAN to improve the reliability of the CAN communication chip. Through the above measures, high-reliability communication of the intelligent multi-way valve is achieved.

[0021] (IV) In addition, in the control of valve core displacement, redundant control of the valve core driving proportional solenoid is achieved through redundant PWM ports, and the power transmission is made more stable and reliable through the two-stage gradual voltage increase, thereby achieving reliable driving of the intelligent multi-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of a highly reliable intelligent multi-way valve driving and control circuit based on CAN communication constructed according to an embodiment.

[0023] FIG. 2( a ) is one of the circuit diagrams of a single CAN communication module constructed according to the example implementation.

[0024] FIG. 2( b ) is a second circuit diagram of a single CAN communication module constructed according to the example implementation.

[0025] FIG. 2( c ) is a third circuit diagram of a single CAN communication module constructed according to the example implementation.

[0026] FIG. 3( a ) is one of the circuit diagrams of a PWM module for a single-channel proportional solenoid constructed according to an example implementation.

[0027] FIG3( b ) is a second circuit diagram of a PWM module for a single-channel proportional electromagnet constructed according to the example implementation.

[0028] FIG. 3( c ) is a third circuit diagram of a PWM module for a single-channel proportional electromagnet constructed according to the example implementation.

[0029] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0030] It should be noted that, unless otherwise specified, all electronic components, devices, modules and chips in the present invention are electronic components, devices, modules and chips known in the prior art.

[0031] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0032] Example:

[0033] This embodiment provides a highly reliable intelligent multi-way valve driving and control circuit based on CAN communication, such as Figure 1 As shown, it includes ADC acquisition module, main control chip, CAN communication module and 24VPWM output module.

[0034] like Figure 1 As shown, the ADC acquisition module includes a displacement acquisition chip, a spare displacement acquisition chip, a signal two-choice optocoupler isolation module and a signal three-choice optocoupler isolation module; the input ends of the displacement acquisition chip and the spare displacement acquisition chip are both used to acquire the signal of the valve core displacement sensor; the input ends of the displacement acquisition chip and the spare displacement acquisition chip are respectively connected to the input ends of the signal two-choice module; the first input end of the signal three-choice optocoupler isolation module is connected to the output end of the signal two-choice module; the second input end of the signal three-choice optocoupler isolation module is used to acquire the signal of pressure sensor 1; the third input end of the signal three-choice optocoupler isolation module is used to acquire the signal of pressure sensor 2.

[0035] like Figure 1As shown, the main control chip includes at least 4 analog quantity acquisition ports, which are ADC1 port, ADC2 port, ADC3 port and ADC4 port respectively; ADC1 port is connected to the output end of the signal two-choice module; ADC2 port is used to collect the signal of pressure sensor 1; ADC3 port is used to collect the signal of pressure sensor 2; ADC4 port is connected to the output end of the signal three-choice optical coupler isolation module.

[0036] like Figure 1 As shown, the CAN communication module includes a 2-way CAN communication module 1 and a CAN communication module 2.

[0037] like Figure 1 As shown, the main control chip includes at least two communication ports, which are a CAN1 port and a CAN2 port; the CAN1 port is connected to the CAN communication module 1 for communication.

[0038] like Figure 1 As shown, the main control chip includes at least two output ports, which are a PWM1 port and a PWM2 port respectively; the PWM1 port and the PWM2 port are respectively connected to the input end of the 24VPWM output module.

[0039] In this embodiment, the CAN communication module 1 and the CAN communication module 2 are both CAN communication modules commonly used in the art. Figure 2(a) to Figure 2(c) CAN communication module 1 and CAN communication module 2 also realize reliable backup communication of two CAN communications by optimizing the bus topology structure of the external and host computers respectively.

[0040] In this embodiment, the output end of the 24V PWM output module is connected to the proportional electromagnet. The 24V PWM output module adopts a commonly used 24V PWM output module known in the art. Further preferably, the PWM module circuit for a single-channel proportional electromagnet is as follows: Figure 3(a) to Figure 3(c) shown.

[0041] As a preferred solution of this embodiment, the main control chip also includes 2 output ports, which are PWM3 port and PWM4 port respectively, and PWM3 port and PWM4 port are also connected to the input end of the 24VPWM output module respectively. The redundant signals of PWM1 and PWM2 are used as the control signals of proportional electromagnet 1, and the redundant signals of PWM3 and PWM4 are used as the control signals of proportional electromagnet 2, so as to realize the reliable control of the valve core of the intelligent multi-way valve.

[0042] In this embodiment, two-way PWM output for a single-way proportional electromagnet is implemented through a two-stage PWM conversion chip to achieve 24V PWM output, and reliable PWM output is achieved through step-by-step voltage stabilization and voltage boosting.

[0043] As a preferred solution of this embodiment, the main control chip adopts a main control chip of model STM32F103. In this embodiment, the signal flow is backed up and redundant at the main control chip, which can realize high-reliability control of the valve core of the intelligent multi-way valve.

[0044] As a preferred solution of this embodiment, when one of the ADC1 port, ADC2 port and ADC3 port in the main control chip is damaged, the main control chip controls the signal three-to-one optocoupler isolation module through the IO port, and outputs the signal corresponding to the damaged ADC port at the output end of the signal three-to-one optocoupler isolation module.

[0045] As a preferred solution of this embodiment, the displacement acquisition chip and the spare displacement acquisition chip both use the displacement acquisition chip of model TLC2275AID. In this embodiment, the displacement acquisition chip of model TLC2275AID is a signal follower. By setting the signal follower, the output signal of the LVDT displacement sensor is combed, and the signal is converted into a signal that is easy to read by the ADC port of the main control chip, so as to achieve high-precision measurement and acquisition of the valve core displacement. In this embodiment, the displacement acquisition chip is provided with a spare displacement acquisition chip. The output of the TLC2275AID chip is used to determine whether the chip is damaged, and when the displacement acquisition chip is damaged, the two-choice module is switched to the spare displacement acquisition chip signal, so as to achieve reliable measurement and acquisition of the valve core displacement.

[0046] As a preferred solution of this embodiment, a self-recovery fuse SMD012-1206 is provided at the external interface of the CAN communication module 1 and the CAN communication module 2. In this embodiment, when the CAN communication module of the external device connected to the smart valve is damaged, the CAN communication module of the smart valve can be protected, thereby improving the reliability of communication.

Claims

1. A highly reliable intelligent multi-way valve drive and control circuit based on CAN communication, characterized in that: Including ADC acquisition module, main control chip, CAN communication module and 24VPWM output module; The ADC acquisition module includes a displacement acquisition chip, a spare displacement acquisition chip, a signal two-choice optical coupling isolation module and a signal three-choice optical coupling isolation module; the input ends of the displacement acquisition chip and the spare displacement acquisition chip are used to acquire the signal of the valve core displacement sensor; the input ends of the displacement acquisition chip and the spare displacement acquisition chip are respectively connected to the input end of the signal two-choice module; the first input end of the signal three-choice optical coupling isolation module is connected to the output end of the signal two-choice module; the second input end of the signal three-choice optical coupling isolation module is used to acquire the signal of pressure sensor 1; the third input end of the signal three-choice optical coupling isolation module is used to acquire the signal of pressure sensor 2; The main control chip includes at least 4 analog quantity acquisition ports, which are ADC1 port, ADC2 port, ADC3 port and ADC4 port respectively; the ADC1 port is connected to the output end of the signal two-choice module; the ADC2 port is used to collect the signal of pressure sensor 1; the ADC3 port is used to collect the signal of pressure sensor 2; the ADC4 port is connected to the output end of the signal three-choice optical coupling isolation module; The CAN communication module includes a 2-way CAN communication module 1 and a CAN communication module 2; The main control chip includes at least two communication ports, which are a CAN1 port and a CAN2 port; the CAN1 port is connected to the CAN communication module 1 for communication; The main control chip includes at least two output ports, which are a PWM1 port and a PWM2 port respectively; the PWM1 port and the PWM2 port are respectively connected to the input end of the 24VPWM output module.

2. The high-reliability intelligent multi-way valve driving and control circuit based on CAN communication as claimed in claim 1 is characterized in that: The main control chip is STM32F103.

3. The high-reliability intelligent multi-way valve driving and control circuit based on CAN communication as claimed in claim 1, characterized in that: When one of the ADC1 port, ADC2 port and ADC3 port in the main control chip is damaged, the main control chip controls the signal three-to-one optocoupler isolation module through the IO port, and outputs the signal corresponding to the damaged ADC port at the output end of the signal three-to-one optocoupler isolation module.

4. The high-reliability intelligent multi-way valve driving and control circuit based on CAN communication as claimed in claim 1, characterized in that: The displacement acquisition chip and the spare displacement acquisition chip are both displacement acquisition chips of model TLC2275AID.

5. The high-reliability intelligent multi-way valve driving and control circuit based on CAN communication as claimed in claim 1, characterized in that: The external interfaces of the CAN communication module 1 and the CAN communication module 2 are both provided with a self-resetting fuse SMD012-1206.

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