A multi-way valve driving control circuit based on CAN communication

Abstract

The application provides a multi-way valve driving control circuit based on CAN communication, comprising an ADC acquisition 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 backup displacement acquisition chip, a signal two-selecting optical coupler isolation module and a signal three-selecting optical coupler isolation module; the application combines multi-dimensional information fusion and transmission into the driving and control process of the multi-way valve from the circuit level, realizes intelligent improvement of the multi-way valve, and respectively starts from information acquisition reliability, communication reliability and valve core control reliability and the like, realizes high-reliability driving and control of the intelligent multi-way valve through a signal redundancy and backup method.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of multi-way valves, and relates to intelligent hydraulic valve components and control, in particular to a multi-way valve driving control circuit based on CAN communication. BACKGROUND

[0002] Multi-way valves are widely used in flow production lines, mine engineering machinery, agricultural engineering machinery and other fields. With the improvement of intelligentization and informatization level and the increase of operation refinement demand, traditional multi-way valves have been difficult to meet the needs of various engineering machinery and flow lines due to low automation / intelligentization level, less working state information acquisition and other shortcomings. The demand for intelligent multi-way valves is increasing. On the other hand, with the improvement of mechanical working efficiency, component damage will lead to more serious economic losses, so high requirements are put forward for the reliability of intelligent multi-way valves.

[0003] For the reliability of multi-way valves, a solenoid valve circuit overcurrent protection method is mentioned in the Chinese invention patent with the application publication number CN112664704A, which can improve the reliability of multi-way solenoid valves to a certain extent. However, its application object is mainly multi-way solenoid valves, and the control logic is simple, which is not suitable for intelligent multi-way valves. The existing intelligent multi-way valves have made many improvements in intelligent information acquisition, intelligent control and other aspects of multi-way valves. However, there is little research on the reliability problems caused by the increase of electronic components in the intelligent process of multi-way valves, and the research on the design of high-reliability intelligent multi-way valve circuits is even rarer. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a multi-way valve driving control circuit based on CAN communication, which solves the technical problem that the reliability of intelligent multi-way valve driving and control in the prior art needs to be further improved.

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

[0006] A multi-way valve driving control circuit based on CAN communication, comprising an ADC acquisition module, a main control chip, a CAN communication module and a 24V PWM output module.

[0007] The ADC acquisition module comprises a displacement acquisition chip, a backup displacement acquisition chip, a signal two-selecting optocoupler isolation module and a signal three-selecting optocoupler isolation module; the input ends of the displacement acquisition chip and the backup displacement acquisition chip are used for acquiring signals of a valve core displacement sensor; the input ends of the displacement acquisition chip and the backup displacement acquisition chip are connected with the input end of the signal two-selecting optocoupler isolation module respectively; the first input end of the signal three-selecting optocoupler isolation module is connected with the output end of the signal two-selecting optocoupler isolation module; the second input end of the signal three-selecting optocoupler isolation module is used for acquiring signals of a pressure sensor 1; and the third input end of the signal three-selecting optocoupler isolation module is used for acquiring signals of a pressure sensor 2.

[0008] The main control chip comprises at least four analog quantity acquisition ports, which are ADC1 port, ADC2 port, ADC3 port and ADC4 port respectively; the ADC1 port is connected with the output end of the signal two-selecting optocoupler isolation module; the ADC2 port is used for acquiring signals of the pressure sensor 1; the ADC3 port is used for acquiring signals of the pressure sensor 2; and the ADC4 port is connected with the output end of the signal three-selecting optocoupler isolation module.

[0009] The CAN communication module comprises two CAN communication modules 1 and 2.

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

[0011] The main control chip comprises at least two output ports, which are PWM1 port and PWM2 port respectively; the PWM1 port and the PWM2 port are connected with the input ends of the 24V PWM output module respectively.

[0012] The application also has the following technical features:

[0013] The main control chip adopts a main control chip with a model of STM32F103.

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

[0015] The displacement acquisition chip and the backup displacement acquisition chip both adopt displacement acquisition chips with a model of TLC2275AID.

[0016] The external interface of the CAN communication module 1 and the CAN communication module 2 is respectively provided with a self-recovery fuse SMD012-1206.

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

[0018] (I) The present application combines multi-dimensional information fusion and transmission into the driving and control process of the multi-way valve from the circuit level, realizes the intelligent improvement of the multi-way valve, and respectively starts from the information acquisition reliability, communication reliability and valve core control reliability, realizes the high reliable driving and control of the intelligent multi-way valve through the signal redundancy and backup method.

[0019] (II) The multi-way valve driving and control circuit of the present application is provided with a redundant port in the multi-way valve working state acquisition port, the control program in the main control chip can automatically switch when detecting the port damage, ensures that the damaged port signal can be recovered in a short time; at the same time, for the more critical valve core displacement signal, the backup displacement acquisition chip is set to realize the 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, two CAN communication chips are designed, so that there are multiple CAN communication channels in the main control chip; at the same time, in the connection of 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 with all the equipment; on the other hand, in order to prevent the intelligent multi-way valve CAN communication chip from being broken down due to the damage of the external CAN communication equipment, a self-recovery fuse is arranged at the connection between the CAN communication chip and the external CAN, to improve the reliability of the CAN communication chip work. Through the above measures, the high reliable communication of the intelligent multi-way valve is realized.

[0021] (IV) In addition, in the control of the valve core displacement, the redundant control of the valve core driving proportional electromagnet is realized through the redundant PWM port, and the power transmission is more stable and reliable through the two-stage step-up form, so as to realize the reliable driving of the intelligent multi-way valve. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the multi-way valve driving control circuit based on CAN communication constructed according to the embodiment.

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

[0024] Fig. 2 (b) is the second single group CAN communication module circuit diagram constructed according to the example embodiment.

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

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

[0027] Figure 3(b) is the second PWM module circuit diagram for a single-channel proportional electromagnet constructed according to the example implementation.

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

[0029] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

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

[0031] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0032] Example:

[0033] This embodiment provides a multi-channel valve drive control circuit based on CAN communication, such as... Figure 1 As shown, it includes an ADC acquisition module, a main control chip, a CAN communication module, and a 24V PWM output module.

[0034] like Figure 1 As shown, the ADC acquisition module includes a displacement acquisition chip, a backup displacement acquisition chip, a 2-to-1 signal optocoupler isolation module, and a 3-to-1 signal optocoupler isolation module. The input terminals of both the displacement acquisition chip and the backup displacement acquisition chip are used to acquire signals from the valve core displacement sensor. The input terminals of the displacement acquisition chip and the backup displacement acquisition chip are respectively connected to the input terminals of the 2-to-1 signal optocoupler isolation module. The first input terminal of the 3-to-1 signal optocoupler isolation module is connected to the output terminal of the 2-to-1 signal optocoupler isolation module. The second input terminal of the 3-to-1 signal optocoupler isolation module is used to acquire the signal from pressure sensor 1. The third input terminal of the 3-to-1 signal optocoupler isolation module is used to acquire the signal from pressure sensor 2.

[0035] like Figure 1As shown in the figure, the master chip at least includes 4 analog quantity acquisition ports, which are ADC1 port, ADC2 port, ADC3 port and ADC4 port respectively; the ADC1 port is connected with the output end of the signal two-optical coupling isolation module; the ADC2 port is used for collecting the signal of the pressure sensor 1; the ADC3 port is used for collecting the signal of the pressure sensor 2; and the ADC4 port is connected with the output end of the signal three-optical coupling isolation module.

[0036] As shown in the figure, Figure 1 The CAN communication module includes 2 CAN communication modules 1 and 2.

[0037] As shown in the figure, Figure 1 The master chip at least includes 2 communication ports, which are CAN1 port and CAN2 port respectively; and the CAN1 port is connected with the CAN communication module 1 for communication.

[0038] As shown in the figure, Figure 1 The master chip at least includes 2 output ports, which are PWM1 port and PWM2 port respectively; and the PWM1 port and the PWM2 port are connected with the input end of the 24VPWM output module respectively.

[0039] In this embodiment, the CAN communication module 1 and the CAN communication module 2 both adopt the commonly used CAN communication module known in the art. Further preferably, the single group of CAN communication module circuit diagrams are shown in Figures 2(a) to 2(c). The CAN communication module 1 and the CAN communication module 2 are also respectively optimized through the bus topology structure of the upper computer externally, so as to realize reliable backup communication of two-way CAN communication.

[0040] In this embodiment, the output end of the 24VPWM output module is connected with the proportional electromagnet. The 24VPWM output module adopts the commonly used 24VPWM output module known in the art. Further preferably, the PWM module circuit for single proportional electromagnet is shown in Figures 3(a) to 3(c).

[0041] As a preferred scheme of this embodiment, the master chip further includes 2 output ports, which are PWM3 port and PWM4 port respectively, and the PWM3 port and the PWM4 port are also connected with the input end of the 24VPWM output module respectively. Among them, the two-way signal redundancy of PWM1 and PWM2 is used as the control signal of the proportional electromagnet 1, and the two-way signal redundancy of PWM3 and PWM4 is used as the control signal of the proportional electromagnet 2, so as to realize reliable control of the intelligent multi-way valve core.

[0042] In the embodiment, two-way PWM output for single-way proportional electromagnet is realized through two-stage PWM conversion chip, 24V PWM output is realized through step-by-step voltage stabilization and voltage boosting, and reliable PWM output is realized.

[0043] As a preferred scheme of the embodiment, the master control chip adopts a master control chip with model number STM32F103. In the embodiment, signal flow is provided with backup and redundancy at the master control chip, and high-reliability control of the intelligent multi-way valve core can be realized.

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

[0045] As a preferred scheme of the embodiment, the displacement acquisition chip and the backup displacement acquisition chip both adopt a displacement acquisition chip with model number TLC2275AID. In the embodiment, the displacement acquisition chip with model number TLC2275AID is a signal follower, and through the signal follower, LVDT displacement sensor output signals are combed, and the signals are converted into signals easy to read by the master control chip ADC port, high-precision measurement and acquisition of the valve core displacement are realized. In the embodiment, the displacement acquisition chip is provided with a backup displacement acquisition chip, whether the TLC2275AID chip is damaged is judged through the TLC2275AID chip output, and in the case that the displacement acquisition chip is damaged, a two-selecting module is switched to the backup displacement acquisition chip signal, reliable measurement and acquisition of the valve core displacement are realized.

[0046] As a preferred scheme of the embodiment, the external interface of the CAN communication module 1 and the CAN communication module 2 are both provided with a self-recovery fuse SMD012-1206. In the embodiment, when the external equipment CAN communication module connected with the intelligent valve is damaged, the intelligent valve CAN communication module can be protected, and the reliability of communication is improved.

Claims

1. A multi-channel valve drive control circuit based on CAN communication, characterized in that, The application relates to a valve core displacement monitoring system, which comprises an ADC acquisition 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 backup displacement acquisition chip, a signal two-selecting optocoupler isolation module and a signal three-selecting optocoupler isolation module; the input ends of the displacement acquisition chip and the backup displacement acquisition chip are used for collecting signals of a valve core displacement sensor; the input ends of the displacement acquisition chip and the backup displacement acquisition chip are connected with the input end of the signal two-selecting optocoupler isolation module; the first input end of the signal three-selecting optocoupler isolation module is connected with the output end of the signal two-selecting optocoupler isolation module; the second input end of the signal three-selecting optocoupler isolation module is used for collecting signals of a pressure sensor 1; and the third input end of the signal three-selecting optocoupler isolation module is used for collecting signals of a pressure sensor 2. The main control chip comprises at least four analog quantity acquisition ports, namely an ADC1 port, an ADC2 port, an ADC3 port and an ADC4 port; the ADC1 port is connected with the output end of the signal two-selecting optocoupler isolation module; the ADC2 port is used for collecting signals of the pressure sensor 1; the ADC3 port is used for collecting signals of the pressure sensor 2; and the ADC4 port is connected with the output end of the signal three-selecting optocoupler isolation module. The CAN communication module comprises a CAN communication module 1 and a CAN communication module 2. The main control chip comprises at least two communication ports, namely a CAN1 port and a CAN2 port; the CAN1 port is connected with the CAN communication module 1 for communication. The main control chip comprises at least two output ports, namely a PWM1 port and a PWM2 port; the PWM1 port and the PWM2 port are connected with the input end of the 24V PWM output module.

2. The CAN communication-based control circuit for driving a multi-way valve according to claim 1, wherein The main control chip adopts a main control chip with the model of STM32F103.

3. The CAN communication based control circuit for driving a multi-way valve according to claim 1, wherein When one of the ADC1 port, the ADC2 port and the ADC3 port in the main control chip is damaged, the main control chip controls the signal three-selecting optocoupler isolation module through an IO port to output a signal corresponding to the damaged ADC port at the output end of the signal three-selecting optocoupler isolation module.

4. The CAN communication based control circuit for driving a multi-way valve according to claim 1, wherein The displacement acquisition chip and the backup displacement acquisition chip both adopt displacement acquisition chips with the model of TLC2275AID.

5. The CAN communication based control circuit for driving a multi-way valve according to claim 1, wherein, Self-recovery fuses SMD012-1206 are arranged at the external interfaces of the CAN communication module 1 and the CAN communication module 2.

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