阅读说明：本技术 一种基于pwm风扇控制的充电桩内温度控制方法 (Charging pile internal temperature control method based on PWM fan control ) 是由 许钢 汝黎明 潘焱 符斌杰 于 2019-08-30 设计创作，主要内容包括：本发明涉及一种基于PWM风扇控制的充电桩内温度控制方法,充电桩采用PWM风扇,通过对充电桩内多个预设温度采集点分别采集若干实时温度数据,得到所采集所有实时温度数据的有效值、实时温度数据最高值和实时温度数据最小值,进而得到充电桩内温度变化情况的温度差值,然后根据该温度差值与预设的PWM风扇的启动温度阈值之间的大小关系决定是否启动PWM输出；再次,分别根据预设的两个温度差阈值,判断是否提高PWM输出占空比或者降低PWM输出占空比,达到对PWM风扇转速的精准调整,实现了针对PWM风扇转速与充电桩内实时温度数据之间的自适应调整,确保了充电桩内PWM风扇的自身温度不会影响到充电桩的正常工作,有效降低风扇能耗和噪音。(The invention relates to a temperature control method in a charging pile based on PWM fan control.A PWM fan is adopted in the charging pile, a plurality of real-time temperature data are respectively collected from a plurality of preset temperature collection points in the charging pile, the effective value, the maximum value and the minimum value of all the collected real-time temperature data are obtained, the temperature difference value of the temperature change condition in the charging pile is further obtained, and then whether PWM output is started or not is determined according to the size relation between the temperature difference value and the preset starting temperature threshold value of the PWM fan; and thirdly, whether the PWM output duty ratio is increased or reduced is judged according to two preset temperature difference threshold values respectively, so that the accurate adjustment of the rotating speed of the PWM fan is achieved, the self-adaptive adjustment between the rotating speed of the PWM fan and the real-time temperature data in the charging pile is realized, the normal work of the charging pile cannot be influenced by the self temperature of the PWM fan in the charging pile, and the energy consumption and the noise of the fan are effectively reduced.)

1. A temperature control method in a charging pile based on PWM fan control is used for the charging pile internally provided with a PWM fan, and is characterized by comprising the following steps:

step 1, presetting a plurality of temperature acquisition points in a charging pile, respectively acquiring a plurality of real-time temperature data aiming at each temperature acquisition point, and respectively forming real-time temperature data sequences corresponding to different temperature acquisition points;

step 2, respectively filtering out the maximum value and the minimum value of the real-time temperature data in each real-time temperature data sequence, and calculating the temperature effective values of each real-time temperature data sequence after the filtering treatment to form a temperature effective value sequence containing all the temperature effective values;

step 3, selecting the maximum value of the temperature effective values and the minimum value of the temperature effective values in the temperature effective value sequence, and calculating the temperature difference value between the maximum value of the temperature effective values and the minimum value of the temperature effective values;

step 4, presetting a starting temperature threshold of the PWM fan, and making judgment processing according to the maximum value of the temperature effective value and the starting temperature threshold:

when the maximum value of the temperature effective value is larger than the starting temperature threshold value, starting PWM output of the PWM fan, and enabling the duty ratio of the PWM output to be a, and enabling a to belong to (0, 100%); otherwise, not starting PWM output of the PWM fan;

step 5, presetting a first temperature difference threshold for starting and increasing the PWM output duty ratio and a second temperature difference threshold for starting and reducing the PWM output duty ratio;

and 6, adjusting the duty ratio output by PWM according to the temperature difference value, the first temperature difference threshold value and the second temperature threshold value:

increasing the duty cycle of the PWM output when the temperature difference value is greater than the first temperature difference threshold;

when the temperature difference value is less than the second temperature difference threshold value, reducing the duty ratio of the PWM output;

when the temperature difference value is between the first temperature difference threshold value and the second temperature difference threshold value, the duty ratio of the PWM output is not adjusted;

step 7, acquiring a real-time temperature data value of the PWM fan;

step 8, judging and processing according to the real-time temperature data value of the PWM fan and the starting temperature threshold value:

when the real-time temperature data value of the PWM fan is smaller than the starting temperature threshold value, the PWM output of the PWM fan is closed; otherwise, the PWM output of the PWM fan is maintained.

2. The method of claim 1, wherein the plurality of temperature collection points are respectively disposed at the top of the inner side of the charging pile housing, at an air inlet of the charging pile, at an air outlet of the charging pile, and at a position of a heat generating component in the charging pile.

3. The charging pile internal temperature control method based on PWM fan control as claimed in claim 1, wherein in step 8, when the real-time temperature data value of the PWM fan is smaller than the starting temperature threshold value, a preset time period is delayed, and then the PWM output of the PWM fan is turned off.

4. The PWM fan control-based charging post internal temperature control method according to claim 3, wherein the preset time period is 30 seconds.

5. The charging pile internal temperature control method based on PWM fan control according to any one of claims 1-4, wherein the starting temperature threshold is 30 ℃.

6. The method for controlling the temperature in the charging pile based on the PWM fan control of claim 5, wherein the duty ratio a is 20%; the first temperature difference threshold is 2 ℃ and the second temperature difference threshold is 1 ℃.

7. The method for controlling the temperature in the charging pile based on the PWM fan control as claimed in claim 1, wherein in step 6, the duty ratio of the PWM output is adjusted in a stepwise manner according to a preset temperature difference.

8. The method of claim 7, wherein the relationship between the preset temperature difference step and the duty ratio increase amplitude of the PWM output is as follows:

when the temperature difference reaches 4 ℃, the amplitude of the PWM output duty ratio is increased by 2%/second;

when the temperature difference reaches 6 ℃, the amplitude of the PWM output duty ratio is increased by 3%/second;

when the temperature difference reaches 8 ℃, the amplitude of the PWM output duty ratio is increased by 4%/second;

when the temperature difference reaches 10 ℃, the increase amplitude of the PWM output duty ratio is 5%/second.

9. The method of controlling the temperature in the charging pile based on the PWM fan control according to claim 8, wherein in step 6, the reduction range of the duty ratio of the PWM output is 2%/sec.

10. The method for controlling the temperature in the charging pile based on the PWM fan control as claimed in claim 1, wherein the PWM output of the PWM fan is modulated by adopting a frequency within a range of 20kHz to 50 kHz.

Technical Field

The invention relates to the field of charging piles, in particular to a temperature control method in a charging pile based on PWM fan control.

Background

Fill electric pile's the module of charging can produce a large amount of heats in the course of the work, if not discharge in time, can influence charge efficiency, original paper ageing and shorten life with higher speed.

In order to discharge a large amount of heat generated by the charging module in time, a common fan is usually installed in the existing charging pile so as to expect to achieve the heat dissipation effect. Starting a fan to operate during charging of the charging pile; and after the charging is finished, the fan is turned off.

However, there is still a problem with this heat dissipation scheme for the heat in the charging pile: the influence of heat generated in the working process of the fan and temperature factors on the control of the fan is not considered, and the rotating speed of a common fan in the existing charging pile is not adjustable, so that serious noise pollution can be caused. In addition, when the rotational speed of filling the interior fan of electric pile and temperature mismatch, can cause the energy consumption of filling electric pile to appear additionally increasing, and because the operation fuel effect of fan self, lead to fan self to become a heat source that fills electric pile interior temperature rise on the contrary. Therefore, how to realize the self-adaptive control of the temperature in the charging pile becomes the key work for ensuring the normal operation of the charging pile.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for controlling the temperature in a charging pile based on PWM fan control in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a temperature control method in a charging pile based on PWM fan control is used for the charging pile internally provided with a PWM fan, and is characterized by comprising the following steps:

step 1, presetting a plurality of temperature acquisition points in a charging pile, respectively acquiring a plurality of real-time temperature data aiming at each temperature acquisition point, and respectively forming real-time temperature data sequences corresponding to different temperature acquisition points;

step 2, respectively filtering out the maximum value and the minimum value of the real-time temperature data in each real-time temperature data sequence, and calculating the temperature effective values of each real-time temperature data sequence after the filtering treatment to form a temperature effective value sequence containing all the temperature effective values;

step 3, selecting the maximum value of the temperature effective values and the minimum value of the temperature effective values in the temperature effective value sequence, and calculating the temperature difference value between the maximum value of the temperature effective values and the minimum value of the temperature effective values;

step 4, presetting a starting temperature threshold of the PWM fan, and making judgment processing according to the maximum value of the temperature effective value and the starting temperature threshold:

when the maximum value of the temperature effective value is larger than the starting temperature threshold value, starting PWM output of the PWM fan, and enabling the duty ratio of the PWM output to be a, and enabling a to belong to (0, 100%); otherwise, not starting PWM output of the PWM fan;

step 5, presetting a first temperature difference threshold for starting and increasing the PWM output duty ratio and a second temperature difference threshold for starting and reducing the PWM output duty ratio;

and 6, adjusting the duty ratio output by PWM according to the temperature difference value, the first temperature difference threshold value and the second temperature threshold value:

increasing the duty cycle of the PWM output when the temperature difference value is greater than the first temperature difference threshold;

when the temperature difference value is less than the second temperature difference threshold value, reducing the duty ratio of the PWM output;

when the temperature difference value is between the first temperature difference threshold value and the second temperature difference threshold value, the duty ratio of the PWM output is not adjusted;

step 7, acquiring a real-time temperature data value of the PWM fan;

step 8, judging and processing according to the real-time temperature data value of the PWM fan and the starting temperature threshold value:

when the real-time temperature data value of the PWM fan is smaller than the starting temperature threshold value, the PWM output of the PWM fan is closed; otherwise, the PWM output of the PWM fan is maintained.

In the method for controlling the temperature in the charging pile based on the PWM fan control, the plurality of temperature collection points in the charging pile are respectively arranged at the top of the inner side of the charging pile shell, the position of an air inlet of the charging pile, the position of an air outlet of the charging pile and the position of a heating component in the charging pile.

And then, in the method for controlling the temperature in the charging pile based on the PWM fan control, in step 8, when the real-time temperature data value of the PWM fan is smaller than the starting temperature threshold value, delaying a preset time period, and then closing the PWM output of the PWM fan.

Further, the preset time period is 30 seconds.

Preferably, in the method for controlling the temperature in the charging pile based on the PWM fan control, the starting temperature threshold is 30 ℃.

Further, in the method for controlling the temperature in the charging pile based on the PWM fan control, the duty ratio a is 20%; the first temperature difference threshold is 2 ℃ and the second temperature difference threshold is 1 ℃.

In step 6, the duty ratio of the PWM output is adjusted in a stepwise manner according to a preset temperature difference to increase the amplitude.

Further, the relationship between the preset temperature difference step and the duty ratio increase amplitude of the PWM output is as follows:

when the temperature difference reaches 4 ℃, the amplitude of the PWM output duty ratio is increased by 2%/second;

when the temperature difference reaches 6 ℃, the amplitude of the PWM output duty ratio is increased by 3%/second;

when the temperature difference reaches 8 ℃, the amplitude of the PWM output duty ratio is increased by 4%/second;

when the temperature difference reaches 10 ℃, the increase amplitude of the PWM output duty ratio is 5%/second.

Further, in step 6, the duty cycle of the PWM output is reduced by 2%/second.

In the method for controlling the temperature in the charging pile based on the PWM fan control, the PWM output of the PWM fan is modulated by adopting the frequency within the range of 20 kHz-50 kHz.

Compared with the prior art, the invention has the advantages that: the charging pile adopts the PWM fan, a plurality of real-time temperature data are respectively collected at a plurality of preset temperature collecting points in the charging pile to obtain effective values, maximum values and minimum values of all the collected real-time temperature data, so as to further obtain a temperature difference value of the temperature change condition in the charging pile, and then whether PWM output is started or not is determined according to the size relation between the temperature difference value and a preset starting temperature threshold value of the PWM fan; and thirdly, whether the PWM output duty ratio is improved or reduced is judged according to two preset temperature difference threshold values respectively, so that the accurate adjustment of the rotating speed of the PWM fan is achieved, the self-adaptive adjustment between the rotating speed of the PWM fan and the real-time temperature data in the charging pile is realized, the normal work of the charging pile cannot be influenced by the heat generated in the operation process of the PWM fan in the charging pile is ensured, and the energy consumption of the fan is effectively reduced and the noise in the operation process of the charging pile is effectively reduced.

Drawings

Fig. 1 is a schematic flow chart of a charging pile internal temperature control method based on PWM fan control according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1, the present embodiment provides a method for controlling temperature in a charging pile based on PWM fan control, which is used for a charging pile with a PWM fan installed therein. Pwm (pulse Width modulation), i.e., pulse Width modulation. Specifically, the method for controlling the temperature in the charging pile based on PWM fan control comprises the following steps:

step 1, presetting a plurality of temperature acquisition points in a charging pile, respectively acquiring a plurality of real-time temperature data aiming at each temperature acquisition point, and respectively forming real-time temperature data sequences corresponding to different temperature acquisition points; for example, the plurality of temperature collection points are respectively arranged at the top of the inner side of the charging pile shell, the position of an air inlet of the charging pile, the position of an air outlet of the charging pile and the position of a heating component in the charging pile;

step 2, respectively filtering out the maximum value and the minimum value of the real-time temperature data in each real-time temperature data sequence, and calculating the temperature effective values of each real-time temperature data sequence after the filtering treatment to form a temperature effective value sequence containing all the temperature effective values;

step 3, selecting the maximum value of the temperature effective values and the minimum value of the temperature effective values in the temperature effective value sequence, and calculating the temperature difference value between the maximum value of the temperature effective values and the minimum value of the temperature effective values;

step 4, presetting a starting temperature threshold of the PWM fan, and making judgment processing according to the maximum value of the temperature effective value and the starting temperature threshold:

when the maximum value of the temperature effective value is larger than the starting temperature threshold value, starting PWM output of the PWM fan, and enabling the duty ratio of the PWM output to be a, wherein a belongs to (0, 100%); otherwise, not starting PWM output of the PWM fan; wherein the starting temperature threshold is 30 ℃; the PWM outputs a waveform, namely the duty ratio of the PWM output waveform is a; in this embodiment, the duty ratio a may be set to 20%; the PWM output duty cycle of the PWM fan can be adjusted by various frequencies, for example, the PWM output of the PWM fan can be modulated by a frequency in the range of 20kHz to 50kHz, and the PWM output waveform is modulated by a frequency of 25kHz in this embodiment, so as to meet the requirements of most PWM fan products on the market;

step 5, presetting a first temperature difference threshold for starting and increasing the PWM output duty ratio and a second temperature difference threshold for starting and reducing the PWM output duty ratio; in the embodiment, the first temperature difference threshold is 2 ℃, and the second temperature difference threshold is 1 ℃;

and 6, adjusting the duty ratio output by the PWM according to the temperature difference value, the first temperature difference threshold value and the second temperature threshold value:

when the temperature difference value is larger than a first temperature difference threshold value, increasing the duty ratio of PWM output; specifically, in the embodiment, the duty ratio of the PWM output is adjusted in a stepped manner according to a preset temperature difference value to increase the amplitude; for example, the relationship between the preset temperature difference step and the duty ratio increase amplitude of the PWM output is as follows:

when the temperature difference reaches 4 ℃, the amplitude of the PWM output duty ratio is increased by 2%/second;

when the temperature difference reaches 6 ℃, the amplitude of the PWM output duty ratio is increased by 3%/second;

when the temperature difference reaches 8 ℃, the amplitude of the PWM output duty ratio is increased by 4%/second;

when the temperature difference reaches 10 ℃, the increase of the PWM output duty ratio is 5%/second.

When the temperature difference value is smaller than a second temperature difference threshold value, reducing the duty ratio of PWM output; for example, the magnitude of the decrease in the duty cycle of the PWM output may be set to 2%/second;

when the temperature difference value is between the first temperature difference threshold value and the second temperature difference threshold value, the duty ratio of PWM output is not adjusted;

step 7, acquiring a real-time temperature data value of the PWM fan;

step 8, judging and processing according to the real-time temperature data value and the starting temperature threshold value of the PWM fan:

when the real-time temperature data value of the PWM fan is smaller than the starting temperature threshold value, the PWM output of the PWM fan is closed; otherwise, the PWM output of the PWM fan is maintained.

As an improvement, in this embodiment, when the real-time temperature data value of the PWM fan is smaller than the start-up temperature threshold, the preset time period may be delayed, and then the PWM output of the PWM fan is turned off. The preset time period referred to herein may be set to 30 seconds.

In the method for controlling the temperature in the charging pile provided by the embodiment, the charging pile adopts a PWM fan, a plurality of real-time temperature data are respectively collected from a plurality of preset temperature collection points in the charging pile, so that effective values, maximum values and minimum values of all the collected real-time temperature data are obtained, a temperature difference value of the temperature change condition in the charging pile is further obtained, and whether PWM output is started or not is determined according to the size relation between the temperature difference value and the starting temperature threshold value; and thirdly, whether the PWM output duty ratio is improved or reduced is judged according to two preset temperature difference threshold values respectively, so that the accurate adjustment of the rotating speed of the PWM fan is achieved, the self-adaptive adjustment between the rotating speed of the PWM fan and the real-time temperature data in the charging pile is realized, the normal work of the charging pile cannot be influenced by the heat generated in the operation process of the PWM fan in the charging pile, and the energy consumption of the fan and the noise in the operation process of the charging pile are effectively reduced.