WO2021098232A1

WO2021098232A1 - Method for detecting abnormality of heat dissipation pipeline, water-cooled radiator, and automobile

Info

Publication number: WO2021098232A1
Application number: PCT/CN2020/101123
Authority: WO
Inventors: 刘钧; 冯颖盈; 姚顺; 张昌盛
Original assignee: 深圳威迈斯新能源股份有限公司
Priority date: 2019-11-19
Filing date: 2020-07-09
Publication date: 2021-05-27
Also published as: CN110715818A

Abstract

Disclosed in the present invention are a method for detecting liquid flow abnormality of a heat dissipation pipeline, a water-cooled radiator, and an automobile. The method for detecting the liquid flow abnormality of the heat dissipation pipeline comprises the following steps: S1, arranging a heating device on the pipeline; S2, detecting a first temperature at an inlet of the pipeline and a second temperature at the heating device in each period; and S3, when any one of the first temperature, the second temperature and a difference value between the first temperature and the second temperature is larger than or equal to a corresponding preset value, determining that the pipeline liquid flow is abnormal, and initiating a fault status. The present invention can accurately determine the situation of a liquid flow abnormality of a heat dissipation pipeline, a timely prompt or treatment is carried out, and the working stability of a heat dissipation apparatus to be cooled is thus ensured.

Description

Detection method for abnormal heat dissipation pipe, water-cooled radiator, automobile

Technical field

The present invention relates to a pipeline radiator with liquid flow, in particular to a detection method for abnormality of a pipeline radiator with liquid flow, a water-cooled radiator adopting the detection method, and an automobile adopting the pipeline radiator.

Background technique

With the increasing demand for energy conservation and environmental protection, the market for new energy vehicles related to energy conservation and environmental protection is currently expanding. At the same time, people are paying more and more attention to the safety and reliability of new energy vehicles. The electrical system of electric vehicles is an important part of the electrical system of new energy vehicles, and its reliability is also the focus of module design.

However, how to detect the abnormal heat dissipation conditions of the water flow pipes of the water-cooled radiator of the electrical system in time is a technical problem that needs to be solved urgently.

Summary of the invention

In order to solve the technical problem of how to detect abnormal heat dissipation conditions of pipe radiators with liquid flow in the prior art, a detection method for abnormal heat dissipation pipes, water-cooled radiators, and automobiles have been proposed.

The method for detecting abnormality of the heat dissipation pipeline provided by the present invention includes the steps:

Step 1. Set heating devices on the pipeline;

Step 2: Detect the first temperature at the inlet of the pipeline and the second temperature at the heating device in each cycle;

Step 3: When any one of the first temperature, the second temperature, and the difference between the first temperature and the second temperature is greater than or equal to the respective preset value, it is determined that the pipeline is abnormal and enters a fault state.

Further, when entering the fault state, it also includes the following steps:

Within a certain period of time, detect the second temperature at the heating device again;

If the second temperature is greater than or equal to its corresponding preset value, the heating device stops working.

Further, if the second temperature detected again is less than its corresponding preset value, the first temperature is detected again, and it is determined whether any one of the current first temperature or the current difference is greater than or equal to the respective corresponding The preset value, if it is, the heating device reduces the working power, otherwise it exits the fault state.

Preferably, the heating device is arranged on the outer wall of the pipeline.

In one embodiment, there are multiple heating devices, and when any one heating device is controlled to stop working, other heating devices are controlled to stop working.

The water-cooled radiator provided by the present invention includes a heat dissipation pipe, and the abnormal condition of the heat dissipation pipe is detected by using the detection method described in the above technical solution.

Specifically, the water-cooled radiator includes: a first temperature sensor for detecting the first temperature, a second temperature sensor for detecting the second temperature, and receiving detections from the first and second temperature sensors As a result, a controller that controls the corresponding heating device.

Further, when the controller controls any one of the heating devices to stop working, the controller controls the water-cooled radiator to stop working; and/or when the controller controls any one of the heating devices to stop working When the power is turned on, the controller controls the water-cooled radiator to reduce the working power.

The automobile proposed by the present invention includes an electrical system, and the electrical system adopts the water-cooled radiator described in the above technical solution.

In a preferred embodiment, the heating device is a component that requires heat dissipation in an electrical system.

The detection method of the present invention is simple and feasible, and the range of the radiating pipe covered can be very comprehensive, and the operability is strong. In addition, the object that needs heat dissipation can be used as a heating device, which is beneficial to the object itself, and can effectively detect abnormal conditions of the heat dissipation pipeline. The detection method and protection measures of the present invention can ensure that the module has no water or other heat dissipation in the water channel. Reliability under abnormal conditions to ensure safe use.

Description of the drawings

The present invention will be described in detail below in conjunction with embodiments and drawings, in which:

Fig. 1 is a schematic diagram of a heat dissipation duct according to a first embodiment of the present invention.

Figure 2 is a flow chart of the failure judgment of the present invention.

Fig. 3 is a schematic diagram of a heat dissipation pipe according to a second embodiment of the present invention.

Figure 4 is a flow chart of the protection measures of the present invention.

Detailed ways

The principle and embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a part of the pipeline of the pipeline radiator of the present invention. A first temperature sensor 1 is provided at the entrance of the heat dissipation pipe of the pipe radiator, that is, the first temperature sensor 1 is close to the water inlet, and a heating device 3 is provided outside the heat dissipation pipe, and the heat dissipation pipe corresponding to the heating device is provided The second temperature sensor 2. The first temperature sensor and the second temperature sensor detect the first temperature T1 at the pipe entrance and the second temperature T2 at the heating device in each time period. The difference between the first temperature T1 and the second temperature T2 is recorded as ΔT . Count the maximum values of T1, T2, and ΔT under different working conditions as their respective preset values, denoted as T1normalmax, T2normalmax and ΔTnormalmax.

When the heat dissipation pipeline is working normally, the heat dissipation liquid such as water in the pipeline is in a circulating state, and the heat generated by the heating device will be quickly taken away by the water in the pipeline. After the module is thermally stable, the first temperature T1 and the second temperature T2 are not much different when the heat dissipation pipe works normally. Therefore, the values of the first temperature T1 and the second temperature T2 and their difference ΔT will all be within the normal range, that is, less than their respective preset values.

When the heat dissipation pipe has abnormal heat dissipation, the above-mentioned first and second temperature and their difference will deviate from the normal range. The specific water channel heat dissipation abnormalities are as follows: there is no water in the heat dissipation pipe; the heat dissipation pipe has water but does not circulate ; The heat dissipation pipe has water but the circulating flow rate is insufficient; the heat dissipation pipe works normally, but the characteristics of the coolant in the heat dissipation pipe are abnormal; the heat dissipation pipe is cooled normally, but the heating device heats abnormally, which causes the heat dissipation pipe to fail to effectively dissipate heat.

For example, when there is water in the heat dissipation pipe but the water pump is not turned on, or there is no water in the heat dissipation pipe, the water flow rate is too low, and other abnormal heat dissipation conditions of the heat dissipation pipe, if the heat conductivity of the heat dissipation pipe body is good, the first temperature will be caused due to the lack of water flow for heat dissipation. T1 and the second temperature T2 gradually rise, and the first temperature T1 eventually exceeds its corresponding preset value T1normalmax. At this time, the water channel heats up abnormally.

For another example, when the heat dissipation pipe has abnormal heat dissipation, if the water does not flow, the thermal conductivity of the body is poor, and the heat of the heating device will accumulate at the second temperature sensor. As a result, the temperature of the second temperature T2 is gradually higher than the first temperature T1, the difference ΔT between the first temperature and the second temperature will gradually increase, and the final difference ΔT exceeds its corresponding preset value ΔTnormalmax. At this time, the water channel heats up abnormally.

Both of the above judgment methods require the module to work for a period of time to judge. When the heat dissipation of the water channel is abnormal, there is a possibility that the temperature of the second temperature T2 itself has exceeded its corresponding preset value T2normalmax within this period of time. Increase the judgment of the second temperature T2. If the second temperature T2>the preset value T2normalmax, the water channel heat dissipation is abnormal.

Therefore, as shown in Figure 2, the controller of the pipe radiator can determine whether the first temperature T1 is greater than or equal to its corresponding preset value, and whether the second temperature is greater than or equal to its corresponding preset value. Whether the difference between the temperatures is greater than or equal to the corresponding preset value, when any one of the first temperature, the second temperature, and the difference between the first temperature and the second temperature is greater than or equal to the respective preset value, It is determined that the liquid flow of the pipeline is abnormal and enters a fault state.

Figure 3 shows a complex system with multiple heating points, which is suitable for a relatively complex pipeline structure (the complex pipeline structure is not shown in the figure). There are multiple heating devices, which are arranged at intervals to be detected at each detection point of the heat dissipation pipe. After detecting the abnormal heat dissipation of the heat dissipation pipe, the controller can adapt to different protections according to different requirements according to the second temperature detected at the different heating devices Measures.

As shown in Figure 4, when the pipe radiator enters a fault state, the second temperature sensor detects the second temperature at the heating device again within a certain period of time. If the second temperature T2 is greater than or equal to its corresponding preset value, the heat inside the heat dissipation pipe is severely heated, and the controller controls the entire pipe radiator or the heating device whose current temperature exceeds the limit to stop working, or all the heating devices stop working. If the second temperature T2 detected again is less than its corresponding preset value, the first temperature T1 is detected again to determine whether the current first temperature T1 or the difference between the current first temperature and the second temperature is greater than or equal to Each corresponding preset value, if it is, it means that only the heat dissipation pipe has poor heat dissipation, and the heat exchange of the part to be cooled with the pipe radiator does not affect its working reliability. The controller can control all the heating devices to reduce the working power, or control the whole The pipe radiator reduces the working power, or sends out a reminder. If the first temperature is less than its corresponding preset value, and the difference between the first temperature and the second temperature is less than the corresponding preset value, exit the fault state.

In this embodiment, the heating element is arranged on the outer wall of the heat dissipation pipe. The pipe radiator of the present invention may be a water-cooled radiator or other types of pipe radiators, which has a heat dissipation pipe. The water-cooled radiator adopts the technical scheme of the present invention to detect whether the heat dissipation pipe is abnormal. In addition to water, the heat-dissipating liquid in the heat-dissipating pipe can also be other cooling liquids, such as refrigerants. The water-cooled radiator can also be further applied in automobiles, especially new energy vehicles, including electrical systems. The electrical system adopts this water-cooled radiator, which also belongs to the protection scope of the present invention, for example, automobile motors, motor control Chargers, on-board chargers, DCDC converters, and water-cooled charging piles. In a preferred embodiment, the parts in the electrical system that need to be dissipated to the water-cooled radiator can be used as heating components, without adding new heat, and at the same time, it can be better for the electrical system. Heat dissipation.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.

Claims

A method for detecting abnormality of a heat dissipation pipeline, which is characterized in that it comprises the following steps:

Step 1. Set heating devices on the pipeline;

Step 2: Detect the first temperature at the inlet of the pipeline and the second temperature at the heating device in each cycle;

Step 3: When any one of the first temperature, the second temperature, and the difference between the first temperature and the second temperature is greater than or equal to the respective preset value, it is determined that the pipeline is abnormal and enters a fault state.
The detection method according to claim 1, characterized in that, when entering a fault state, it further comprises the steps of:

Within a certain period of time, detect the second temperature at the heating device again;

If the second temperature is greater than or equal to its corresponding preset value, the heating device stops working.
The detection method of claim 2, wherein if the second temperature detected again is less than its corresponding preset value, the first temperature is detected again to determine whether the current first temperature or the current Whether any one of the difference values is greater than or equal to the respective preset value, if it is, the heating device reduces the working power, otherwise it exits the fault state.
The detection method according to claim 1, wherein the heating device is arranged on the outer wall of the pipeline.
The detection method according to claim 3, wherein the heating device has a plurality of heating devices, and when any heating device is controlled to stop working, the other heating devices are controlled to stop working.
A water-cooled radiator comprising a heat dissipation pipe, wherein the detection method according to any one of claims 1 to 5 is used to detect the abnormal condition of the heat dissipation pipe.
The water-cooled radiator according to claim 6, characterized by comprising: a first temperature sensor for detecting the first temperature, a second temperature sensor for detecting the second temperature, and receiving the first temperature sensor. 1. The detection result of the second temperature sensor is a controller that controls the corresponding heating device.
7. The water-cooled radiator according to claim 7, wherein when the controller controls any one of the heating devices to stop working, the controller controls the water-cooled radiator to stop working; and/or, When the controller controls any one of the heating devices to reduce the operating power, the controller controls the water-cooled radiator to reduce the operating power.
An automobile comprising an electrical system, characterized in that the electrical system adopts the water-cooled radiator according to any one of claims 6 to 8.
The automobile according to claim 9, wherein the heating device is a component that needs to be dissipated in the electrical system.