Multi-channel high-temperature sensor resistance and temperature detection equipment based on multiple communications
阅读说明：本技术 基于多种通讯的多路高温传感器阻值及温度的检测设备 (Multi-channel high-temperature sensor resistance and temperature detection equipment based on multiple communications ) 是由 朱俊杰 于 2019-11-08 设计创作，主要内容包括：本发明公开了一种基于多种通讯的多路高温传感器阻值及温度的检测设备,包括电源模块、AD采样模块、控制单元以及通讯单元；所述控制单元包括两个通过SPI接口进行数据交互的控制模块,电源模块的输出端分别连接两个控制模块、AD采样模块和通讯单元的电源输入端,AD采样模块的输出端分别连接两个控制模块的输入端,两个控制模块与通讯单元互联。本发明可以对多路高温传感器进行检测,加快了高温传感器在生产测试中的测试时间,提高了检测速度,同时该检测设备还具有多种通讯方式,可以和不同的生产设备进行对接匹配通讯,满足了不同生产场合的检查要求。(The invention discloses a multi-channel high-temperature sensor resistance and temperature detection device based on multiple communications, which comprises a power module, an AD sampling module, a control unit and a communication unit, wherein the power module is used for supplying power to the AD sampling module; the control unit comprises two control modules for data interaction through SPI interfaces, the output end of the power module is respectively connected with the power input ends of the two control modules, the AD sampling module and the communication unit, the output end of the AD sampling module is respectively connected with the input ends of the two control modules, and the two control modules are interconnected with the communication unit. The invention can detect a plurality of paths of high-temperature sensors, quickens the test time of the high-temperature sensors in production test, improves the detection speed, has a plurality of communication modes, can carry out butt joint matching communication with different production equipment, and meets the inspection requirements of different production occasions.)
1. Multichannel high temperature sensor resistance and check out test set of temperature based on multiple communication, its characterized in that: the device comprises a power module for providing a power supply, an AD sampling module for collecting output signals of the high-temperature sensor, a control unit for comparing and judging the collected signals and a communication unit for sending data to an external control center; the control unit comprises two control modules for data interaction through SPI interfaces, the output end of the power module is respectively connected with the power input ends of the two control modules, the AD sampling module and the communication unit, the output end of the AD sampling module is respectively connected with the input ends of the two control modules, and the two control modules are interconnected with the communication unit.
2. The multi-channel high-temperature sensor resistance and temperature detection device based on multiple communications according to claim 1, wherein: the power module is including the LDO chip that is used for the filter circuit of filtering, is used for sample mains voltage's the signal of telecommunication sampling circuit and is used for detecting whether power chip works at normal within range, and the input of the signal of telecommunication sampling circuit is connected to filter circuit's output, and the input of LDO chip is connected to the signal of telecommunication sampling circuit's output, and the power input of control module is connected to the output of LDO chip.
3. The multi-channel high-temperature sensor resistance and temperature detection device based on multiple communications according to claim 2, wherein: the power module further comprises a protection circuit for preventing current, voltage and PMOS from being reversely connected, and the input end of the protection circuit is connected with the output end of the LDO chip.
4. The multi-channel high-temperature sensor resistance and temperature detection device based on multiple communications according to claim 1, wherein: the AD sampling module comprises a sampling resistor, a reference resistor, a first capacitor and a second capacitor, wherein the sampling resistor is connected with the reference resistor through a wire in an annular mode and is used for providing sampling voltage, the reference resistor is used for providing reference voltage, the first capacitor and the second capacitor are used for filtering, the output end of the high-temperature sensor to be tested is connected between the sampling resistor and the reference resistor through a wire, the reference resistor and the first capacitor are connected with the input end of the control module through a wire, and the wire between the first capacitor and the second capacitor is grounded.
5. The multi-channel high-temperature sensor resistance and temperature detection device based on multiple communications according to claim 1, wherein: the control module comprises a filter circuit for filtering harmonic components in the power supply, a single chip microcomputer for processing signals and a crystal oscillator for providing clock signals for the single chip microcomputer, the input end of the filter circuit is connected with the output end of the power supply module, the output end of the filter circuit is connected with the input end of the single chip microcomputer, and two ends of the crystal oscillator are connected to the clock end of the single chip microcomputer.
6. The multi-channel high-temperature sensor resistance and temperature detection device based on multiple communications according to claim 1, wherein: the communication unit comprises a CAN communication module used for sending data to an external control center, an RS232 communication module used for communicating with production line equipment and an RS485 communication module used for communicating with a remote terminal, and the input ends of the CAN communication module, the RS232 communication module and the RS485 communication module are interconnected with the two control modules.
Technical Field
The invention relates to the technical field of sensor detection in an engine.
Background
With the implementation of various national emission regulations, the emission requirements of engines are higher and higher, and many engine manufacturers also carry out technical model selection again to meet the emission requirements.
In an automobile engine, a high-temperature sensor is used for detecting the temperature of smoke in an exhaust funnel in a high-temperature severe environment, and the temperature value plays a crucial role in the process of monitoring the running state of an automobile, so that the quality of the high-temperature sensor is particularly important. After the high-temperature sensor is produced, the product needs to be subjected to performance testing, and the high-temperature sensor can be delivered from a factory and installed after the product is qualified, so that how to efficiently detect the high-temperature sensor product is one of the problems to be solved for improving the production efficiency. However, the existing detection equipment is low in efficiency, can only detect a high-temperature sensor within 6 paths, and is single in communication mode, and only one communication mode is available.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multi-channel high-temperature sensor resistance and temperature detection device based on multiple communications, which can detect the multi-channel high-temperature sensor, improve the detection speed and improve the working efficiency.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
The multi-channel high-temperature sensor resistance and temperature detection equipment based on multiple communications comprises a power module for providing power, an AD sampling module for collecting output signals of the high-temperature sensors, a control unit for comparing and judging the collected signals and a communication unit for sending data to an external control center; the control unit comprises two control modules for data interaction through SPI interfaces, the output end of the power module is respectively connected with the power input ends of the two control modules, the AD sampling module and the communication unit, the output end of the AD sampling module is respectively connected with the input ends of the two control modules, and the two control modules are interconnected with the communication unit.
Above-mentioned check out test set of multichannel high temperature sensor resistance and temperature based on multiple communication, power module is including the filter circuit that is used for the filtering, the power signal of telecommunication sampling circuit that is used for sample mains voltage and be used for detecting the LDO chip that whether power chip worked in normal range, and the input of power signal of telecommunication sampling circuit is connected to filter circuit's output, and the input of LDO chip is connected to power signal of telecommunication sampling circuit's output, and control module's power input end is connected to the output of LDO chip.
Above-mentioned check out test set of multichannel high temperature sensor resistance and temperature based on multiple communication, power module still includes the protection circuit who is used for preventing electric current, voltage and PMOS transposition, and protection circuit's input is connected at the output of LDO chip.
Above-mentioned check out test set of multichannel high temperature sensor resistance and temperature based on multiple communication, AD sampling module includes that the sampling resistor who is used for providing sampling voltage, the reference resistance who is used for providing reference voltage and the first electric capacity and the second electric capacity that are used for the filtering are connected through the wire annular, connects the output of awaiting measuring high temperature sensor through the wire between sampling resistor and the reference resistance, passes through the input of wire connection control module between reference resistor and the first electric capacity, wire ground connection between first electric capacity and the second electric capacity.
Above-mentioned check out test set of multichannel high temperature sensor resistance and temperature based on multiple communication, control module is including the filtering circuit who is arranged in the filtering power harmonic composition, the singlechip that is arranged in the signal processing and the crystal oscillator that is used for providing clock signal for the singlechip, and power module's output is connected to filtering circuit's input, and the input of singlechip is connected to filtering circuit's output, and the clock end at the singlechip is connected at the both ends of crystal oscillator.
Above-mentioned check out test set of multichannel high temperature sensor resistance and temperature based on multiple communication, the communication unit is including being used for carrying out data transmission to outside control center's CAN communication module, the RS232 communication module that is used for carrying out communication interconnection with production line equipment and the RS485 communication module that is used for carrying out data communication with remote terminal, and CAN communication module, RS232 communication module and RS485 communication module's input and two control module are interconnected.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The invention can detect a plurality of paths of high-temperature sensors, quickens the test time of the high-temperature sensors in production test, improves the detection speed, has a plurality of communication modes, can carry out butt joint matching communication with different production equipment, and meets the inspection requirements of different production occasions.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit diagram of a power module according to the present invention;
FIG. 3 is a circuit diagram of an AD sampling module according to the present invention;
FIG. 4 is a circuit diagram of a control module according to the present invention;
FIG. 5 is a circuit diagram of a CAN communication module according to the present invention;
FIG. 6 is a circuit diagram of an RS232 communication module according to the present invention;
fig. 7 is a circuit diagram of an RS485 communication module according to the present invention.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples.
The structural block diagram of the multi-channel high-temperature sensor resistance and temperature detection equipment based on various communications is shown in fig. 1 and comprises a power supply module, an AD sampling module, a control unit and a communication unit. The power module is used for providing the power, and AD sampling module is used for gathering high temperature sensor's output signal, and the control unit is used for carrying out the comparison judgement with the signal of gathering, and the communication unit is used for sending data for external control center. The output end of the power supply module is respectively connected with the power supply input ends of the control unit, the AD sampling module and the communication unit, the output end of the AD sampling module is connected with the input end of the control unit, and the control unit is interconnected with the communication unit.
The power supply module comprises a filter circuit, a power supply electric signal sampling circuit, an LDO chip and a protection circuit. Filter circuit is used for the filtering, and the power signal of telecommunication sampling circuit is used for sampling mains voltage, the LDO chip is used for detecting whether power chip works in normal range, and protection circuit is used for preventing electric current, voltage and PMOS are connect conversely, power signal of telecommunication sampling circuit's input is connected to filter circuit's output, the input of LDO chip is connected to power signal of telecommunication sampling circuit's output, the output of LDO chip is connected respectively with protection circuit, control module's power input end.
The circuit diagram of the power module in the invention is shown in fig. 2, a main chip of the power module adopts an LDO chip capable of outputting 5V power and is used for supplying power to the control unit, the AD sampling module and the communication unit, and output signals of the filter circuit and the power electric signal sampling circuit are supplied to the LDO chip for processing and are used for detecting whether the power chip works in a normal range.
The AD sampling module comprises a sampling resistor, a reference resistor, a first capacitor and a second capacitor. The sampling resistor is used for providing sampling voltage, the reference resistor is used for providing reference voltage, the first capacitor and the second capacitor are used for filtering, the sampling resistor, the reference resistor, the first capacitor and the second capacitor are connected in an annular mode through a wire, the sampling resistor and the reference resistor are connected through a wire to the output end of a high-temperature sensor to be tested, the reference resistor and the first capacitor are connected through a wire to the input end of the control module, and the wire between the first capacitor and the second capacitor is grounded.
The circuit diagram of the AD sampling module in the present invention is shown in fig. 3, wherein the sampling resistor is R65, the reference resistor is R61, the first capacitor is C45, the second capacitor is C47, and the resistance of the reference resistor R61 is 1K Ω resistor, and is connected in series with the sampling resistor of the detected sensor to divide the voltage to form a loop. The AD sampling module utilizes the principle of voltage division of a reference resistor and a sampling resistor in a circuit to enable the control module to acquire a corresponding voltage value.
The control unit is used for comparing and judging the signals collected by the AD sampling module and the standard values, and comprises two control modules which are connected through an SPI (serial peripheral interface), and the two control modules carry out data interaction through the SPI. Two control modules utilize the SPI communication mode to connect, can satisfy the AD sampling port that reaches 32 at most to the cascaded communication mode of SPI can be more nimble carry out the interchange between the data.
The control module comprises a filter circuit, a singlechip and a crystal oscillator. The filter circuit is used for filtering harmonic components in the power supply, the single chip microcomputer is used for processing signals collected by the AD collection module, the crystal oscillator is used for providing clock signals for the single chip microcomputer, the input end of the filter circuit is connected with the output end of the power supply module, the output end of the filter circuit is connected with the input end of the single chip microcomputer, and two ends of the crystal oscillator are connected to the clock end of the single chip microcomputer.
The circuit diagram of the control module of the invention is shown in fig. 4, the single chip microcomputer adopts MC9S08DZ60 of Feichka, and the two control modules in the detection device adopt two MC9S08DZ60 single chip microcomputers which are cascaded through SPI communication, so that the single chip microcomputers can interact with each other in the collection process, the collection of some special occasions is processed, and more complex and changeable functions are realized. And after the single chip microcomputer receives the voltage value transmitted by the AD acquisition module, the resistance value and the temperature value of the high-temperature sensor are calculated, and data are sent out through the communication unit.
The communication unit comprises a CAN communication module, an RS232 communication module and an RS485 communication module. The CAN communication module is used for sending data to an external control center, the RS232 communication module is used for realizing communication interconnection with production line equipment, the RS485 communication module is used for carrying out data communication with a remote terminal, and the input ends of the CAN communication module, the RS232 communication module and the RS485 communication module are interconnected with the two control modules.
The CAN communication module is used for sending data to an upper computer of an external control center for direct display, a circuit diagram of the CAN communication module is shown in fig. 5, a main chip of the CAN communication module is a TJA1050CAN transceiver, the TJA1050 has excellent output symmetry, even under the condition that a common-mode coil is not added, the common-mode interference resistance is strong, an error signal CAN be cut off quickly when a bus is in error, normal communication is guaranteed, and the CAN communication module is widely applied to automobile electronic communication.
The circuit diagram of the RS232 communication module in the invention is shown in FIG. 6, the main chip of the RS232 communication module is MAX232, and the communication end of the production equipment is connected to the RS-232 wiring terminal to realize communication interconnection with the production line equipment.
The circuit diagram of the RS485 communication module is shown in FIG. 7, the main chip of the RS485 communication module is MAX485, wherein
When the high-temperature sensor is detected, the detection equipment is connected with a power supply, the exterior of the detection equipment is well connected with the high-temperature sensor and is connected with a computer upper computer of a control center through a CAN bus; after the power-on, the detection equipment starts to collect the voltage value under the partial pressure of the sampling resistor, and then carries out proportional calculation on the collected voltage value and the reference resistor 1K, so that the current resistance value of the high-temperature sensor is obtained, then the current corresponding temperature is obtained by looking up a table according to the known temperature resistance corresponding table of the high-temperature sensor, and the resistance value and the temperature data are sent to an upper computer of a control center through the CAN communication module by the single chip microcomputer to be directly displayed. The detection equipment can send the detected resistance value and temperature data to corresponding production equipment through the RS232 communication module, or carry out data interaction. The detection equipment can remotely send the detected resistance value and temperature data to the remote terminal through the RS485 communication module for remote monitoring.
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