Multi-signal input processing module circuit for combination instrument of mine dump truck

Abstract

The utility model discloses a multi-signal input processing module circuit for a combination instrument of a mine dump truck, which comprises a front-stage processing module, a rear-stage processing module, a signal processing module, a signal processing module and a signal processing module, and is characterized in that the front-stage processing module comprises a front-stage input port and a front-stage output port; the variable device module comprises a variable device 1, a variable device 2 and a variable device 3, one end of the variable device 1 is connected with the VCC end, the other end of the variable device 1 is connected with the preceding-stage output port, one end of the variable device 2 is connected with the VCC end, the other end of the variable device 2 is connected with the preceding-stage output port, one end of the variable device 3 is connected with the preceding-stage output port, and the other end of the variable device 3 is connected with the GND end; and the post-stage processing module comprises a post-stage input port and a post-stage output port, the post-stage input port is connected with the pre-stage output port, and the post-stage output port is connected with the single chip microcomputer. According to the utility model, the PCB of the peripheral circuit used by the sensor can be universally used.

Description

Technical Field

[0001] This utility model belongs to the field of instrument technology, specifically relating to a multi-signal input processing module circuit for a combination instrument of a mining dump truck. Background Technology

[0002] The sensor signals of the instrument clusters on existing mining dump trucks are becoming increasingly diverse, and the types of signals and peripheral processing circuits are becoming more and more complex. Currently, independent circuit designs exist for 0-500R resistance signals, 0.5-4.5V voltage signals, and 4-20mA current signals. These signal acquisition circuits are not interchangeable, and changing signals requires redesigning the PCB circuit board. Furthermore, the large number of signal types leads to a proliferation of peripheral circuits, resulting in a wide variety of PCB models for the instrument clusters, causing significant waste. Utility Model Content

[0003] The purpose of this utility model is to provide a multi-signal input processing module circuit for a combination instrument of a mining dump truck, which can make the PCB of the peripheral circuit used by the sensor universal.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a multi-signal input processing module circuit for a combination instrument panel of a mining dump truck, comprising:

[0005] The pre-processing module includes a pre-processing input port and a pre-processing output port.

[0006] The variable device module includes variable device 1, variable device 2 and variable device 3. One end of variable device 1 is connected to the VCC terminal and the other end is connected to the preamp output port. One end of variable device 2 is connected to the VCC terminal and the other end is connected to the preamp output port. One end of variable device 3 is connected to the preamp output port and the other end is connected to the GND terminal.

[0007] The post-processing module includes a post-processing input port and a post-processing output port. The post-processing input port is connected to the pre-processing output port, and the post-processing output port is connected to the microcontroller.

[0008] Furthermore, the front-end input port receives a sensor voltage signal of 0.5-4.5V, while variable devices 1, 2, and 3 are reserved for future use.

[0009] Furthermore, the sensor resistance signal of 0-500 ohms is input to the pre-amplifier input port, and the variable device 1 is a 240 ohm resistor, the variable device 2 is a 240 ohm resistor, and the variable device 3 is a 120 ohm resistor.

[0010] Furthermore, a 4-20mA sensor current signal is input to the preamplifier input port. Variable devices 1 and 2 are reserved for future use, and variable device 3 is a 120-ohm resistor.

[0011] Furthermore, the pre-processing module includes resistor R1, capacitor C1, and resistor R2. One end of resistor R1 is connected to the pre-amplifier input port, and the other end is connected to the GND port. One end of capacitor C1 is connected to the pre-amplifier input port, and the other end is connected to the GND port. One end of resistor R2 is connected to the pre-amplifier input port, and the other end is connected to the pre-amplifier output port.

[0012] Furthermore, resistor R1 is 100KΩ, capacitor C1 is 0.01μF, and resistor R2 is 10Ω.

[0013] Furthermore, the post-processing module includes a resistor R5 and a capacitor C2. One end of the resistor R5 is connected to the output port of the pre-amplifier and the other end is connected to the output port of the post-amplifier. One end of the capacitor C2 is connected to the resistor R5 and the other end is connected to GND.

[0014] Furthermore, the resistor R5 is 100KΩ and the capacitor C2 is 0.1μF.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) The general-purpose front-end processing module keeps all components universal in the multi-signal mode. Variable device 1, variable device 2 and variable device 3 can be reserved or used. The general-purpose back-end processing module keeps all components universal in the multi-signal mode. Variable devices 1, 2 and 3 can be reserved and used when making PCB, without affecting the universality of PCB. The PCB of the peripheral circuit used by the sensor is universal.

[0017] (2) The pre-processing module is a filter circuit, and R2 is a current-limiting resistor;

[0018] (3) When making PCBA, the variable components are reserved but not mounted, which does not affect the versatility of the PCB. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of a multi-signal input processing module applied to a voltage sensor.

[0020] Figure 2 This is a circuit diagram of a multi-signal input processing module applied to a resistive sensor.

[0021] Figure 3 for Figure 2 The equivalent circuit diagram;

[0022] Figure 4 This is a circuit diagram of a multi-signal input processing module applied to a current sensor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 This utility model provides a circuit solution for a multi-signal input processing module for a combination instrument panel of a mining dump truck.

[0025] A multi-signal input processing module circuit for a combination instrument panel of a mining dump truck includes:

[0026] The pre-processing module includes a pre-processing input port and a pre-processing output port.

[0027] The variable device module includes variable device 1, variable device 2 and variable device 3. One end of variable device 1 is connected to the VCC terminal and the other end is connected to the preamp output port. One end of variable device 2 is connected to the VCC terminal and the other end is connected to the preamp output port. One end of variable device 3 is connected to the preamp output port and the other end is connected to the GND terminal.

[0028] The post-processing module includes a post-processing input port and a post-processing output port. The post-processing input port is connected to the pre-processing output port, and the post-processing output port is connected to the microcontroller.

[0029] The general-purpose pre-processing module maintains the same universal components in multi-signal mode. Variable components 1, 2, and 3 can all be reserved or used. The general-purpose post-processing module also maintains the same universal components in multi-signal mode. In application, the 0-2V AD signal output voltage of the post-processing section is exactly within the 0-5V range of the AVCC detection voltage of the microcontroller's AD port. The accuracy of the microcontroller processing fully meets the requirements of the instrument. When making the PCB, variable components 1, 2, and 3 can be reserved and used without affecting the PCB's universality.

[0030] When users replace or upgrade sensors in the instrument clusters of mining dump trucks, the instrument panel PCB needs to be redesigned, such as replacing resistive sensors with voltage or current sensors. This design allows for the use of universal PCBs for the peripheral circuits of the sensors, solving the compatibility issues of various instrument panel PCB types and significantly reducing the types of instrument panel PCBs and inventory.

[0031] The pre-processing module is a filtering circuit, consisting of resistor R1, capacitor C1, and resistor R2. One end of resistor R1 is connected to the pre-amp input port, and the other end is connected to the GND port. One end of capacitor C1 is connected to the pre-amp input port, and the other end is connected to the GND port. One end of resistor R2 is connected to the pre-amp input port, and the other end is connected to the pre-amp output port. Resistor R1 is 100KΩ, capacitor C1 is 0.01μF, and resistor R2 is 10Ω. R2 is a current-limiting resistor.

[0032] The post-processing module includes resistor R5 and capacitor C2. One end of resistor R5 is connected to the output port of the pre-amplifier, and the other end is connected to the output port of the post-amplifier. One end of capacitor C2 is connected to resistor R5, and the other end is connected to GND. Resistor R5 is 100KΩ, and capacitor C2 is 0.1μF. R5 is the input resistor of the microcontroller port, and C2 is the filter capacitor of the microcontroller port.

[0033] like Figure 1 As shown, when applied to a voltage sensor, the front-end input port receives a sensor voltage signal of 0.5-4.5V. Variable devices 1, 2, and 3 are reserved for future use.

[0034] In this application, the AD signal voltage of 0.5-4.5V falls precisely within the 0-5V range of the AVCC detection voltage of the microcontroller's AD port. The microcontroller's AD accuracy is 10 digits with a maximum value of 1023 and a maximum voltage of 5V. When the input is 4.5V, the corresponding AD value is 920; when the input is 0.5V, the corresponding AD value is 102. The theoretical accuracy of the microcontroller during processing is 1 / (920-102) = 0.13%, fully meeting the accuracy requirements of the combined instrument. When manufacturing the PCBA, variable components are left unmounted, thus not affecting the PCB's versatility.

[0035] like Figure 2 and Figure 3 As shown, when applied to a resistive sensor, the sensor resistance signal of 0-500R is input to the front-end input port, and the variable device 1 is a 240-ohm resistor, the variable device 2 is a 240-ohm resistor, and the variable device 3 is a 120-ohm resistor.

[0036] When the sensor resistance is 0, the voltage input to the microcontroller's AD port is 0 volts; when the sensor resistance is 500 volts, the voltage input to the microcontroller's AD port is 2.2 volts. The microcontroller's AD accuracy is 10 digits with a maximum value of 1023 and a maximum voltage of 5 volts. When the input is 2.2 volts, the corresponding AD value is 450; when the input is 0 volts, the corresponding AD value is 0. The theoretical accuracy of the microcontroller during processing is 1 / 450 = 0.23%, which fully meets the accuracy requirements of the combined instrument; at the same time, the versatility of the PCB is also taken into account.

[0037] like Figure 4As shown, when applied to a current sensor, a 4-20mA sensor current signal is input to the front-end input port. Variable device 1 and variable device 2 are reserved and not used. Variable device 3 is a 120-ohm resistor.

[0038] When the signal current flows in, the sampling voltage of the microcontroller is 120*0.02=2.4V, which is exactly half of the highest value (5V) of the AVCC detection voltage of the microcontroller's AD port; when the signal current flows in is 4mA, the sampling voltage of the microcontroller is 120*0.004=0.48V. The microcontroller's AD accuracy is 10 digits with a maximum value of 1023 and a maximum voltage of 5 volts; when the input is 2.4 volts, the corresponding AD value is 491, and when the input is 0.48 volts, the corresponding AD value is 98. The theoretical accuracy of the microcontroller during processing is 1 / (491-98)=0.26%, which fully meets the accuracy requirements of the combined instrument.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-signal input processing module circuit for a combination instrument panel of a mining dump truck, characterized in that, include: The pre-processing module includes a pre-processing input port and a pre-processing output port. The variable device module includes variable device 1, variable device 2 and variable device 3. One end of variable device 1 is connected to the VCC terminal and the other end is connected to the preamp output port. One end of variable device 2 is connected to the VCC terminal and the other end is connected to the preamp output port. One end of variable device 3 is connected to the preamp output port and the other end is connected to the GND terminal. The post-processing module includes a post-processing input port and a post-processing output port. The post-processing input port is connected to the pre-processing output port, and the post-processing output port is connected to the microcontroller.

2. The multi-signal input processing module circuit for a combination instrument panel of a mining dump truck according to claim 1, characterized in that, The preamplifier input port receives a sensor voltage signal of 0.5-4.5V. Variable devices 1, 2, and 3 are reserved for future use.

3. The multi-signal input processing module circuit for a combination instrument panel of a mining dump truck according to claim 1, characterized in that, The preamplifier input port receives a sensor resistance signal of 0-500 ohms. Variable device 1 is a 240-ohm resistor, variable device 2 is a 240-ohm resistor, and variable device 3 is a 120-ohm resistor.

4. The multi-signal input processing module circuit for a combination instrument panel of a mining dump truck according to claim 1, characterized in that, The preamplifier input port receives a 4-20mA sensor current signal. Variable devices 1 and 2 are reserved and not used. Variable device 3 is a 120-ohm resistor.

5. The multi-signal input processing module circuit for a combination instrument panel of a mining dump truck according to claim 1, characterized in that, The preamplifier module includes resistor R1, capacitor C1, and resistor R2. One end of resistor R1 is connected to the preamplifier input port, and the other end is connected to the GND port. One end of capacitor C1 is connected to the preamplifier input port, and the other end is connected to the GND port. One end of resistor R2 is connected to the preamplifier input port, and the other end is connected to the preamplifier output port.

6. The multi-signal input processing module circuit for a combination instrument panel of a mining dump truck according to claim 5, characterized in that, Resistor R1 is 100KΩ, capacitor C1 is 0.01μF, and resistor R2 is 10Ω.

7. The multi-signal input processing module circuit for a combination instrument panel of a mining dump truck according to claim 1, characterized in that, The post-processing module includes a resistor R5 and a capacitor C2. One end of the resistor R5 is connected to the output port of the pre-amplifier and the other end is connected to the output port of the post-amplifier. One end of the capacitor C2 is connected to the resistor R5 and the other end is connected to GND.

8. The multi-signal input processing module circuit for a combination instrument panel of a mining dump truck according to claim 7, characterized in that, The resistor R5 is 100KΩ and the capacitor C2 is 0.1μF.

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