New energy automobile motor controller heat dissipation method

Abstract

The invention relates to the field of controller heat dissipation, in particular to a new energy automobile motor controller heat dissipation method which reasonably selects air cooling heat dissipation or liquid cooling heat dissipation according to the external environment so as to quickly control the actual temperature of a motor controller to be below a threshold temperature, and then the heat dissipation capacity of a heat dissipation module is further adjusted so as to improve the heat dissipation efficiency of the motor controller. The heat production efficiency of the motor controller and the heat dissipation efficiency of the heat dissipation module are balanced, so that the temperature of the motor controller is kept stable, the temperature fluctuation in the heat dissipation process is reduced, fault judgment and alarm are carried out under the condition that cooling and heat dissipation are failed, the cost is reduced, the heat dissipation and temperature control effects are good, and the equipment operation reliability is high. The heat dissipation strategy is reasonable and efficient.

Description

Technical Field

[0001] The present invention relates to the field of controller heat dissipation, and in particular to a heat dissipation method for a motor controller of a new energy vehicle. Background Art

[0002] The motor controller of new energy vehicles is the core control device that controls the start, operation, stop, speed change, etc. of the motor, and IGBT is the most important component in the motor controller. The IGBT module controls the motor according to the control instructions. Since the current flowing through the IGBT is large, the IGBT will generate a lot of heat when working. When the temperature is too high, it will affect the performance of the IGBT and even cause IGBT failure, which will affect the normal operation of the entire control system. Therefore, the controller needs to be cooled in time. In the related technology, most of them use air cooling mode and liquid cooling mode to cool and dissipate the heat of the motor controller. When the IGBT temperature is greater than the first temperature threshold, air cooling is used, and when the IGBT temperature is greater than the second temperature threshold, liquid cooling is used. The second temperature threshold is greater than the first temperature threshold. However, this method of selecting air cooling or water cooling based on the temperature of the IGBT does not reasonably select the heat dissipation method in combination with the external environment, and cannot balance the heat generation efficiency of the motor controller with the heat dissipation efficiency of the heat dissipation device, which causes the temperature fluctuation of the motor controller to be large. At the same time, there is no reasonable fault detection measure in the face of heat dissipation failure, and the heat dissipation strategy is unreasonable. Summary of the invention

[0003] According to the deficiencies of the prior art, the present invention proposes a heat dissipation method for a motor controller of a new energy vehicle to solve the problem that the heat dissipation strategy of the prior heat dissipation method is unreasonable.

[0004] A heat dissipation method for a new energy vehicle motor controller of the present invention specifically comprises the following steps: Set the motor controller temperature threshold and the outside air humidity threshold; Get the actual temperature of the motor controller and the actual humidity of the outside air; When the actual temperature of the motor controller is greater than the motor controller temperature threshold, if the actual humidity of the outside air is less than the outside air humidity threshold, the air cooling module of the heat dissipation module is turned on to dissipate heat for the motor controller; if the actual humidity of the outside air is greater than the outside air humidity threshold, the liquid cooling module of the heat dissipation module is turned on to dissipate heat for the motor controller; If the actual temperature of the motor controller after heat dissipation is still greater than the motor controller temperature threshold, the fault object is determined and an alarm is issued; After heat dissipation, the actual temperature of the motor controller is less than the temperature threshold of the motor controller, and the heat dissipation of the heat dissipation module is adjusted until the actual temperature of the motor controller remains unchanged.

[0005] Optionally, the liquid cooling module dissipates heat at a preset amount of heat for a preset time, thereby reducing the temperature of the motor controller; The air cooling module dissipates heat at the maximum amount for a preset time, thereby reducing the temperature of the motor controller.

[0006] Optionally, if the actual temperature of the motor controller is still greater than the temperature threshold of the motor controller after the air cooling module dissipates heat at the maximum heat dissipation for a preset time, the liquid cooling module is turned on and dissipates heat at a preset heat dissipation for a preset time, thereby reducing the temperature of the motor controller.

[0007] Optionally, after the air cooling module dissipates heat at the maximum heat dissipation for a preset time, the actual temperature of the motor controller is less than a temperature threshold of the motor controller, and the heat dissipation of the air cooling module is reduced until the temperature of the motor controller remains unchanged.

[0008] Optionally, the liquid cooling module dissipates heat at a preset heat dissipation amount for a preset time, and the actual temperature of the motor controller is less than a temperature threshold of the motor controller; the heat dissipation of the liquid cooling module is reduced until the temperature of the motor controller remains unchanged.

[0009] Optionally, after the liquid cooling module dissipates heat at a preset amount for a preset time, the actual temperature of the motor controller is still greater than the temperature threshold of the motor controller; Increase the heat dissipation of the liquid cooling module, thereby reducing the temperature of the motor controller.

[0010] Optionally, when the heat dissipation of the liquid cooling module reaches a maximum and the actual temperature of the motor controller is still greater than a temperature threshold of the motor controller, the liquid cooling module is cleaned.

[0011] Optionally, the liquid cooling module can dissipate heat normally after cleaning, and the motor controller fault alarm; After cleaning, the liquid cooling module cannot dissipate heat normally, and a liquid cooling module fault alarm is issued.

[0012] Optionally, the outside air humidity is obtained using a humidity sensor.

[0013] Optionally, the liquid cooling module is cleaned using high pressure air or high pressure water.

[0014] The beneficial effects of the present invention are as follows: a heat dissipation method for a motor controller of a new energy vehicle of the present invention reasonably selects air cooling or liquid cooling according to the external environment, and gives priority to air cooling with lower cost when environmental conditions permit, so as to reduce costs. At the same time, when dissipating heat, the actual temperature of the motor controller is first quickly controlled below the threshold temperature, and then the heat dissipation of the heat dissipation module is further adjusted to balance the heat generation efficiency of the motor controller with the heat dissipation efficiency of the heat dissipation module, so as to keep the temperature of the motor controller stable, that is, the balance of heat generation and heat dissipation is ensured by combining coarse adjustment and fine adjustment, so as to maintain the temperature stability of the motor controller and reduce the temperature fluctuation during the heat dissipation process; in the case of failure of cooling and heat dissipation, the fault is judged and an alarm is issued, so as to facilitate the operator to repair the equipment. The present invention integrates environmental factors, temperature control effects, and fault detection, while reducing costs, having good heat dissipation and temperature control effects, high equipment operation reliability, and reasonable and efficient heat dissipation strategies. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0016] Figure 1 The present invention is a flow chart of a method for heat dissipation of a motor controller of a new energy vehicle. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] A heat dissipation method for a motor controller of a new energy vehicle of the present invention is used to dissipate heat for a motor controller of a new energy vehicle, and more specifically, is used to adjust the temperature of a controller of a motor controller of a new energy vehicle, see Figure 1 , Figure 1 The flowchart of the heat dissipation method provided by the embodiment of the present invention may specifically include the following steps: Step S1: Setting a motor controller temperature threshold and an outside air humidity threshold; Step S2: Acquire the actual temperature of the motor controller and the actual humidity of the outside air; Step S3: when the actual temperature of the motor controller is greater than the temperature threshold of the motor controller, if the actual humidity of the outside air is less than the humidity threshold of the outside air, the air cooling module of the heat dissipation module is turned on to dissipate heat for the motor controller; if the actual humidity of the outside air is greater than the humidity threshold of the outside air, the liquid cooling module of the heat dissipation module is turned on to dissipate heat for the motor controller; Step S4: after the heat dissipation, the actual temperature of the motor controller is still greater than the temperature threshold of the motor controller, and the fault object is determined and an alarm is issued; Step S5: After heat dissipation, the actual temperature of the motor controller is less than the temperature threshold of the motor controller, and the heat dissipation of the heat dissipation module is adjusted until the actual temperature of the motor controller remains unchanged.

[0019] The temperature threshold of the motor controller is the critical value for opening the heat dissipation module for heat dissipation. In practical applications, the temperature threshold of the motor controller can be reasonably set according to different models of motor controllers. When controlling the heat dissipation of the heat dissipation module, the present invention takes into account the humidity of the outside air, and then selects to use the air cooling module for heat dissipation or the liquid cooling module for heat dissipation according to the environmental conditions. Air cooling directly utilizes natural resources, and the air cooling module is usually simple in structure and easy to maintain, so the cost of air cooling is low, but the external environment has a greater impact on air cooling, especially the humidity of the outside air. When the air humidity is high (for example, rain), the circulating wind easily makes the motor controller damp, affecting the performance. Therefore, when heat dissipation is required, the humidity of the outside air is first detected, and the humidity of the outside air can be obtained by a humidity sensor. When the environmental conditions permit, the air cooling module is preferentially used for heat dissipation. If the environmental conditions do not allow, the liquid cooling module is used for heat dissipation, which improves the economy while ensuring the heat dissipation efficiency. If the heat dissipation module cannot effectively dissipate heat, the fault object is judged and an alarm is issued so that the staff can repair the equipment in a targeted manner. If the actual temperature of the motor controller is less than the motor controller temperature threshold after heat dissipation, the heat dissipation of the heat dissipation module is adjusted to keep the actual temperature of the motor controller unchanged, that is, the heat generated by the motor controller is balanced with the heat dissipation of the heat dissipation module by adjusting the heat dissipation of the heat dissipation module, so that the actual temperature of the motor controller no longer changes (remains unchanged), reducing the temperature fluctuation during the heat dissipation process. The present invention integrates environmental factors, temperature control effects, and fault judgment, while reducing costs, while having good heat dissipation and temperature control effects, high equipment operation reliability, and reasonable and efficient heat dissipation strategies.

[0020] In a further embodiment, the liquid cooling module dissipates heat at a preset heat amount for a preset time, thereby reducing the temperature of the motor controller; the air cooling module dissipates heat at a maximum heat amount for a preset time, thereby reducing the temperature of the motor controller.

[0021] The air cooling module is greatly affected by the environment, and it dissipates heat at the maximum heat dissipation (that is, the maximum wind speed) for a preset time; the liquid cooling module is less affected by the environment and has a better heat dissipation effect. It dissipates heat at a preset flow rate for a preset time, so that the motor controller can be cooled down quickly and the temperature of the motor controller can be controlled below the threshold, and then the heat dissipation of the heat dissipation module is adjusted. Through the combination of coarse adjustment and fine adjustment, the heat generation efficiency and heat dissipation efficiency are balanced, thereby maintaining the temperature stability of the motor controller and reducing temperature fluctuations during the heat dissipation process.

[0022] The present invention provides a temperature sensor on the motor controller to obtain the temperature of the motor controller, and provides an air humidity sensor on the outside of the air cooling module to obtain the external air humidity.

[0023] Furthermore, the air cooling module can directly dissipate heat from the motor controller through a cooling fan, or through a circulating air duct. The liquid cooling module can use a separate water cooling system to cool the motor controller, or use a refrigerant to cool the motor controller. When using a refrigerant for cooling, the refrigerant in the circulating liquid cooling tube of the motor controller is heat-exchanged with the refrigerant of the vehicle air conditioning system through a heat exchanger, thereby cooling the motor controller.

[0024] In a further embodiment, after the air cooling module dissipates heat at the maximum heat dissipation for a preset time, the actual temperature of the motor controller is still greater than the motor controller temperature threshold, the liquid cooling module is turned on and dissipates heat at the preset heat dissipation for a preset time, thereby reducing the temperature of the motor controller. When the air cooling module cannot reduce the temperature of the motor controller to below the threshold, the air cooling module and the water cooling module are used synchronously to control the temperature of the motor controller.

[0025] In a further embodiment, after the air cooling module dissipates heat at the maximum heat dissipation for a preset time, the actual temperature of the motor controller is less than the motor controller temperature threshold, and the heat dissipation of the air cooling module is reduced until the temperature of the motor controller remains unchanged.

[0026] In a further embodiment, the liquid cooling module dissipates heat at a preset heat dissipation amount for a preset time, and the actual temperature of the motor controller is less than the motor controller temperature threshold; the heat dissipation of the liquid cooling module is reduced until the temperature of the motor controller remains unchanged.

[0027] After the motor controller cools down rapidly, the actual temperature of the motor controller is lower than the motor controller temperature threshold and tends to continue to decrease. At this time, the cooling trend of the motor controller is gradually reduced by gradually reducing the heat dissipation of the heat dissipation module, so that the actual temperature of the motor controller gradually stabilizes. After the actual temperature of the motor controller stabilizes, the heat dissipation module only needs to maintain the current heat dissipation.

[0028] In a further embodiment, after the liquid cooling module dissipates heat at a preset amount for a preset time, the actual temperature of the motor controller is still greater than the temperature threshold of the motor controller; the heat dissipation of the liquid cooling module is increased to reduce the temperature of the motor controller.

[0029] In a further embodiment, when the actual temperature of the motor controller is still greater than the motor controller temperature threshold after the liquid cooling module dissipates the maximum amount of heat, the liquid cooling module is cleaned. When cleaning the liquid cooling module, the outer wall of the liquid cooling module is mainly cleaned to prevent the liquid cooling module from being covered with dust and mud due to long-term use. Cleaning the liquid cooling module is mainly to eliminate the influence of external factors on the heat dissipation module. The liquid cooling module can be cleaned by high-pressure air or high-pressure water.

[0030] The liquid cooling module can dissipate heat normally after cleaning, but the temperature of the motor controller cannot be controlled within the threshold. Then the motor controller fault alarm will be issued and the staff can repair the motor controller.

[0031] If the liquid cooling module cannot dissipate heat normally after cleaning, it means that the liquid cooling module may be faulty, and the liquid cooling module fault alarm will be issued, and the staff can inspect and repair the liquid cooling module. To detect whether the liquid cooling module can dissipate heat normally, a temperature sensor can be installed at the inlet and outlet of the liquid cooling module to determine whether the liquid cooling module can work normally based on the temperature difference.

[0032] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for heat dissipation of a motor controller of a new energy vehicle, characterized in that: The following steps are involved: Set the motor controller temperature threshold and the outside air humidity threshold; Get the actual temperature of the motor controller and the actual humidity of the outside air; When the actual temperature of the motor controller is greater than the motor controller temperature threshold, if the actual humidity of the outside air is less than the outside air humidity threshold, the air cooling module of the heat dissipation module is turned on to dissipate heat for the motor controller; if the actual humidity of the outside air is greater than the outside air humidity threshold, the liquid cooling module of the heat dissipation module is turned on to dissipate heat for the motor controller; If the actual temperature of the motor controller after heat dissipation is still greater than the motor controller temperature threshold, the fault object is determined and an alarm is issued; After heat dissipation, the actual temperature of the motor controller is less than the temperature threshold of the motor controller, and the heat dissipation of the heat dissipation module is adjusted until the actual temperature of the motor controller remains unchanged.

2. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 1, characterized in that: The liquid cooling module dissipates heat at a preset amount of heat for a preset time, thereby reducing the temperature of the motor controller; The air cooling module dissipates heat at the maximum amount for a preset time, thereby reducing the temperature of the motor controller.

3. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 2, characterized in that: After the air cooling module dissipates heat at the maximum heat dissipation for a preset time, the actual temperature of the motor controller is still greater than the temperature threshold of the motor controller, the liquid cooling module is turned on and dissipates heat at the preset heat dissipation for a preset time, thereby reducing the temperature of the motor controller.

4. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 3, characterized in that: After the air cooling module dissipates heat at the maximum heat dissipation for a preset time, the actual temperature of the motor controller is less than the motor controller temperature threshold, and the heat dissipation of the air cooling module is reduced until the temperature of the motor controller remains unchanged.

5. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 3, characterized in that: The liquid cooling module dissipates heat at a preset heat dissipation amount for a preset time, and the actual temperature of the motor controller is less than the temperature threshold of the motor controller; the heat dissipation of the liquid cooling module is reduced until the temperature of the motor controller remains unchanged.

6. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 3, characterized in that: After the liquid cooling module dissipates heat at a preset amount for a preset time, the actual temperature of the motor controller is still greater than the temperature threshold of the motor controller; Increase the heat dissipation of the liquid cooling module, thereby reducing the temperature of the motor controller.

7. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 6, characterized in that: After the heat dissipation of the liquid cooling module reaches the maximum, the actual temperature of the motor controller is still greater than the motor controller temperature threshold. Clean the liquid cooling module.

8. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 7, characterized in that: The liquid cooling module can dissipate heat normally after cleaning, and the motor controller fault alarm is triggered; After cleaning, the liquid cooling module cannot dissipate heat normally, and a liquid cooling module fault alarm is issued.

9. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 1, characterized in that: The outside air humidity is obtained using a humidity sensor.

10. A method for heat dissipation of a motor controller for a new energy vehicle according to claim 8, characterized in that: The liquid cooling module is cleaned using high pressure air or high pressure water.

Images