Method and system for reducing power consumption of internal combustion engine piston temperature wireless real-time measurement system

Abstract

The invention discloses a method for reducing wireless real-time measurement power consumption of piston temperature of an internal combustion engine. And judging whether the internal combustion engine is in a working state through the characteristic temperature to control the system to work and sleep. And when the internal combustion engine does not work, the system enters dormancy, so that the purpose of reducing system operation power consumption is achieved, and the requirement for long-time work of the system is met. In addition, the ID data and the serial number data are combined and compressed, and the multiple paths of temperature sensor data are combined and compressed, so that the wireless transmission data volume is reduced, and the transmission power consumption of the system is reduced. The internal combustion engine piston temperature wireless real-time measurement system adopting the method has the advantage of being low in power consumption, and the working requirement for long-time internal combustion engine piston temperature measurement can be met.

Description

Technical Field

[0001] The invention patent relates to the technical field of engines and testing related fields, and more specifically, to a piston temperature measurement system for an internal combustion engine. Background Art

[0002] An internal combustion engine is a power device that converts thermal energy into mechanical energy. It has a compact structure, high output power, and is stable and reliable. It is a mobile power device with the highest thermal efficiency and is widely used in various fields such as vehicles and ships. In an internal combustion engine, the piston, as a "heart" component, plays a key role in heat-to-work conversion, flow field organization, and combustion organization. However, the working conditions of the piston are very harsh. It is in direct contact with high-temperature combustion gas (2500K) and is subjected to the coupling of alternating thermal stress and alternating mechanical stress. It is prone to mechanical failures such as ablation, cracking, and cylinder pulling. Measuring the piston temperature is an important basis for evaluating its thermal load and reliability.

[0003] Due to the working form of the piston and the internal environment, the temperature measurement system is currently powered by a heat-resistant battery. Considering the limited battery capacity and the time-consuming installation of the temperature measurement system, the system must have low power consumption to meet the needs of long-term operation. Therefore, how to reduce the energy consumption of the piston temperature measurement system has become a difficult problem. Summary of the invention

[0004] In view of the defects of the prior art or the need for improvement, in order to achieve the above-mentioned purpose, according to one aspect of the present invention, a method for reducing the power consumption of a wireless real-time temperature measurement system for an internal combustion engine piston is provided, characterized in that by detecting a characteristic temperature, it is determined whether the internal combustion engine is in a working state; when the internal combustion engine is determined to be in a working state, the system works; when the internal combustion engine is determined to be in a non-working state, the system goes into sleep mode.

[0005] Further, the characteristic temperature is the temperature of the emitter arranged at the piston pin seat;

[0006] Further, the characteristic temperature is the piston temperature;

[0007] The specific steps are as follows:

[0008] S1, turn on the transmitter switch, power on the system, and enter the main program.

[0009] S2: The system performs initialization configuration and sets the system operating frequency and threshold temperature.

[0010] S3, read the characteristic temperature.

[0011] S4, compare the temperature read in S3 with the threshold temperature. If the read temperature is less than or equal to the set threshold, it means that the engine is not working at this time, and the system enters sleep mode and wakes up after the set working cycle ends; if the read temperature is greater than the set threshold, it means that the engine is working at this time, and the transmitter performs a complete data collection and RF transmission process. After the data is sent, the system enters sleep mode and wakes up after the set working cycle ends, and repeats step S3.

[0012] The wireless real-time temperature measurement system for the internal combustion engine piston includes a wireless signal transmitter located below the piston pin seat in the cylinder, a data receiving antenna located below the cylinder liner, and a wireless signal receiver located outside the cylinder. The temperature sensor senses the temperature of the piston surface to be measured, converts the temperature signal into a voltage signal to be measured, and transmits the measured voltage signal to the wireless signal transmitter in the cylinder. The data transmitting antenna transmits the temperature of the point to be measured, the cold end temperature and other signals to the data receiving antenna through 433MHz wireless communication. The data receiving antenna transmits the data to the wireless signal receiver outside the cylinder, and transmits it to the host computer by wire, and finally completes the real-time display of the temperature data in the host computer.

[0013] Considering that when collecting data for a multi-cylinder internal combustion engine, it is necessary to collect temperature data of multiple pistons, and a wireless signal transmitter needs to be installed on each piston accordingly. At the same time, each piston needs to collect the temperature of multiple measuring points, and each wireless signal transmitter transmits multi-channel temperature sensor data. Therefore, in order to meet the needs of post-processing of data, in addition to the necessary multi-channel temperature sensor analog-to-digital conversion data, cold end temperature and battery voltage data, it also includes ID data representing the transmitter and serial number data representing the temperature sensor. Therefore, ID data is used to distinguish different transmitters, and serial numbers are used to distinguish different temperature sensors. The data to be sent is shown in Table 1. Add a data check bit at the end of the data frame. When the host computer receives the data, it performs data verification and eliminates data frames that are interfered with and produce errors.

[0014] Table 1 Sending data information

[0015]

[0016] Furthermore, in order to reduce power consumption during data transmission, data is compressed to reduce data transmission power consumption, including compressing ID and serial number or multi-channel temperature sensor data.

[0017] Specifically, the ID and serial number are compressed. Here, the original data of the ID and serial number are both 8 bits. The ID number is used to distinguish different transmitters, and the serial number is used to distinguish the piston temperature sensor. When the ID and serial number are compressed, the high bit of one byte is used to represent the ID, and the low bit of one byte is used to represent the temperature sensor. When it is necessary to measure the temperature of two pistons, the corresponding two transmitters work, so only the lower 1 bit of the ID number is retained, and 0 / 1 can be used to distinguish different transmitters. The serial number uses the lower 7 bits for counting, and the counting range is 0 to 127. The ID and the serial number are merged, and the ID number is moved to the highest bit. The data mask 1 indicates that the data is retained, and the mask 0 indicates that the data is discarded. Correspondingly, when it is necessary to measure the temperature of four pistons, the corresponding four transmitters work, so the lower 2 bits of the ID number are retained, and the serial number uses the lower 6 bits for counting. Similarly, the ID and the serial number are merged, and the ID number is moved to the highest bit. Therefore, only 1 byte is needed to represent the data represented by the original 2 bytes.

[0018] Specifically, for multi-channel thermocouple data compression, the current analog-to-digital converter conversion accuracy is 16 bits, the range is ±0.256V, and its resolution is 7.8125μV. If only the lower 12 bits are used, the range is 32mV. For the K-type thermocouple used in the experiment, the thermocouple temperature measurement range corresponding to this voltage value is about 770°C, and the maximum temperature of the internal combustion engine piston is below 600°C. Therefore, the use of 12 bits can fully meet the temperature measurement requirements. The multi-channel thermocouple voltage data compression method is as follows: merge the temperature data of thermocouple 1 and thermocouple 2, discard the upper 4 bits of data, and only retain the lower 12 bits of data. Data mask 1 indicates that the data is retained, and mask 0 indicates that the data is discarded. At this time, only 3 bytes are needed to represent the data represented by the original 4 bytes.

[0019] According to one aspect of the present invention, a system for reducing the power consumption of wireless real-time measurement of internal combustion engine piston temperature is provided, which includes a memory and a processor; the memory stores a computer program that can be executed by the processor, and when the computer program is executed by the processor, the above-mentioned method for reducing the power consumption of wireless real-time measurement of internal combustion engine piston temperature is implemented.

[0020] In general, the above technical solution conceived by the present invention provides a method for reducing the power consumption of a wireless real-time measurement system for the temperature of an internal combustion engine piston, which can achieve the following beneficial effects:

[0021] (1) The characteristic temperature is used to determine whether the internal combustion engine is in working state, thereby controlling the system operation and sleep state. When the internal combustion engine is not working, the system enters sleep state, thereby achieving the purpose of reducing the system operation power consumption and meeting the system's long-term operation requirements.

[0022] (2) By combining and compressing the ID data and serial number data, the multi-channel temperature sensor data is combined and compressed to reduce the amount of wireless transmission data and further reduce the system transmission power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the working principle diagram of the wireless real-time measurement system for the piston temperature of an internal combustion engine;

[0024] Figure 2 A flow chart of a system working method using the emitter temperature as the characteristic temperature;

[0025] Figure 3 A flow chart of the system working method using the ambient temperature as the characteristic temperature;

[0026] Figure 4 It is the ID and serial number data compression method;

[0027] Figure 5 It is a multi-channel thermocouple data compression method. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. In the present invention, the terms "first", "second", etc. (if any) in the present invention and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0029] Internal combustion engine piston temperature wireless real-time measurement system, the system working principle is as follows Figure 1 shown. Specific embodiment one:

[0031] A method for reducing the power consumption of a wireless real-time measurement system for internal combustion engine piston temperature. The system flow chart is as follows: Figure 2 As shown, the specific steps include:

[0032] S1, turn on the transmitter switch, power on the system, and enter the main program.

[0033] S2, the system performs initialization configuration and sets the system operating frequency to 1Hz and the temperature threshold.

[0034] S3, read the transmitter temperature.

[0035] S4, compares the temperature read in S3 with the threshold temperature. If the read temperature is less than or equal to the set threshold, it means that the internal combustion engine is not working at this time, and the system enters the sleep mode and wakes up after a 1Hz cycle; if the read temperature is greater than the set threshold, it means that the internal combustion engine is working at this time, and the transmitter performs a complete data collection and RF transmission process. After the data is sent, the system enters the sleep mode, wakes up after a 1Hz cycle, re-enters the working mode, and starts the next round of sampling.

[0036] The transmitter is installed in the crankcase below the piston pin seat. When the internal combustion engine is working, the transmitter temperature is about 100°C. When the internal combustion engine is not working, the transmitter is approximately at room temperature. Therefore, 50°C can be set as the transmitter working threshold.

[0037] This method only needs to read the transmitter temperature to determine whether the internal combustion engine is working or not, which is simple and quick. However, for a system that only measures the temperature of a single piston, since there is only one transmitter temperature sensor, when the transmitter temperature sensor fails, it is easy to cause misjudgment, making it impossible to start the engine temperature measurement program. Specific embodiment 2:

[0039] A method for reducing power consumption of a wireless real-time temperature measurement system for an internal combustion engine piston comprises the following steps:

[0040] S1, turn on the transmitter switch, power on the system, and enter the main program.

[0041] S2, the system performs initialization configuration and sets the system operating frequency to 1Hz and the temperature threshold;

[0042] S3, read the transmitter temperature;

[0043] S4, read the piston temperature;

[0044] S5, performs cold-end compensation processing on the piston temperature read by S4, wherein the transmitter temperature is the cold-end compensation temperature, and compares the piston temperature after cold-end compensation processing with the threshold temperature. If the read temperature is less than or equal to the set threshold, it means that the internal combustion engine is not working at this time, and the system enters the sleep mode and wakes up after a 1Hz cycle; if the read temperature is greater than the set threshold, it means that the internal combustion engine is working at this time, and the transmitter performs a complete data collection and RF transmission process. After the data is sent, the system enters the sleep mode, wakes up after a 1Hz cycle, re-enters the working mode, and starts the next round of sampling.

[0045] The temperature sensor directly measures the piston temperature, which is 200-300°C when the internal combustion engine is working. When the internal combustion engine is not working, the sensor temperature is close to normal temperature. Here, 50°C is set as the sensor temperature threshold.

[0046] Furthermore, for multiple sensors, when the temperature of all sensors is less than the set threshold, it means that the engine is not working at this time. As long as the temperature of one sensor is greater than the set threshold, it means that the internal combustion engine is working at this time. Although this method is more complicated than the transmitter temperature determination method, due to the multiple piston temperature sensors, when one piston temperature sensor fails, it is not easy to misjudge the working state of the internal combustion engine, and the reliability is higher.

[0047] In order to reduce power consumption during data transmission, data is compressed to reduce data transmission power consumption, including compression of ID and serial number or compression of multi-channel thermocouple data.

[0048] Specifically, the ID and serial number are compressed. Here, the original data of the ID and serial number are both 8 bits. The ID number is used to distinguish different transmitters, and the serial number is used to distinguish the piston temperature sensor. When the ID and serial number are compressed, the high bit of one byte is used to represent the ID, and the low bit of one byte is used to represent the temperature sensor. When it is necessary to measure the temperature of two pistons, the corresponding two transmitters work, so only the lower 1 bit of the ID number is retained, and 0 / 1 can be used to distinguish different transmitters. The serial number uses the lower 7 bits for counting, and the counting range is 0 to 127. The ID and the serial number are merged, and the ID number is moved to the highest bit. The data mask 1 indicates that the data is retained, and the mask 0 indicates that the data is discarded. Correspondingly, when it is necessary to measure the temperature of four pistons, the corresponding four transmitters work, so the lower 2 bits of the ID number are retained, and the serial number uses the lower 6 bits for counting. Similarly, the ID and the serial number are merged, and the ID number is moved to the highest bit. Therefore, only 1 byte is needed to represent the data represented by the original 2 bytes.

[0049] Specifically, for multi-channel thermocouple data compression, the current analog-to-digital converter conversion accuracy is 16 bits, the range is ±0.256V, and its resolution is 7.8125μV. If only the lower 12 bits are used, the range is 32mV. For the K-type thermocouple used in the experiment, the thermocouple temperature measurement range corresponding to this voltage value is about 770°C, and the maximum temperature of the internal combustion engine piston is below 600°C. Therefore, the use of 12 bits can fully meet the temperature measurement requirements. The multi-channel thermocouple voltage data compression method is as follows. The temperature data of thermocouple 1 and thermocouple 2 are merged, and the upper 4 bits of data are discarded, retaining only the lower 12 bits of data. Data mask 1 indicates that the data is retained, and mask 0 indicates that the data is discarded. The merging diagram is as follows Figure 4 shown.

[0050] At this time, only 3 bytes are needed to represent the data originally represented by 4 bytes.

[0051] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for reducing power consumption of wireless real-time measurement of piston temperature in an internal combustion engine, characterized in that: By detecting the characteristic temperature, it is determined whether the internal combustion engine is in working state; when it is determined that the internal combustion engine is in working state, the system works; when it is determined that the internal combustion engine is not in working state, the system sleeps.

2. A method for reducing power consumption of wireless real-time measurement of piston temperature of an internal combustion engine according to claim 1, characterized in that: The characteristic temperature is the temperature of the transmitter arranged at the piston pin seat.

3. The method for reducing power consumption of wireless real-time measurement of piston temperature of an internal combustion engine according to claim 1, characterized in that: The characteristic temperature is the piston temperature.

4. A method for reducing power consumption of wireless real-time measurement of piston temperature of an internal combustion engine according to claim 3, characterized in that: The piston temperature is cold-end compensated using the transmitter temperature.

5. The method for reducing power consumption of wireless real-time measurement of piston temperature of an internal combustion engine according to claim 1, characterized in that: Compress the collected data.

6. A method for reducing power consumption of wireless real-time measurement of piston temperature of an internal combustion engine according to claim 5, characterized in that: The ID data representing the transmitter and the serial number data representing the temperature sensor are combined and compressed.

7. A method for reducing power consumption of wireless real-time measurement of piston temperature of an internal combustion engine according to claim 5, characterized in that: Combine and compress multi-channel temperature sensor data.

8. A system for reducing power consumption of wireless real-time measurement of piston temperature of an internal combustion engine, comprising a memory and a processor; the memory stores a computer program executable by the processor, and the computer program, when executed by the processor, implements the method for reducing power consumption described in any one of claims 1 to 7.

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