Charging and thermal management combined control system and method

Abstract

The invention discloses a charging and thermal management combined control system and method, and belongs to the technical field of new energy heavy trucks, and the system comprises a charging system which is used for calculating the charging rate according to the charging current and the capacity of a power battery in a constant-current charging mode, and transmitting the charging rate to a thermal management system; the thermal management system is used for receiving the charging multiplying power information, dynamically setting the maximum working power according to the charging multiplying power, and performing frequency modulation control based on the target temperature of the system and the temperature of the water outlet; according to the system provided by the invention, the maximum power of thermal management can be adjusted based on the charging rate, high-power heat dissipation with high charging rate and low-power heat dissipation with low charging rate are realized, combined control of the charging system and the thermal management system is realized, and energy conservation of the whole vehicle is ensured; the maximum power of the thermal management system is limited, and the noise of the whole vehicle is reduced while the charging refrigeration effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to a charging and thermal management combined control system and method, belonging to the technical field of new energy heavy trucks. Background Art

[0002] Current thermal management systems (TMS) for new energy heavy-duty trucks primarily employ a control strategy based on temperature feedback (e.g., monitoring battery or coolant temperature to adjust cooling power). This strategy has the following inherent drawbacks: 1. The power design of TMS needs to be compatible with the highest charging rate (such as megawatt charging), which causes the cooling system to continue to operate at high power during low-rate charging, resulting in energy waste.

[0003] 2. The high-power cooling system still runs at full capacity in low-load scenarios, generating continuous high-frequency noise and affecting the charging station environment.

[0004] 3. To meet peak heat dissipation requirements, a high-power TMS must be configured, which significantly increases the cost of the entire vehicle and reduces the cost-effectiveness of charging.

[0005] 4. Existing technologies attempt to improve temperature control accuracy by optimizing temperature sampling points, but the fundamental problem remains unresolved: There is no active association between charging rate and TMS power, and the upper limit of heat dissipation power cannot be dynamically constrained according to charging demand; There is a lack of a tiered limit mechanism for the maximum power of TMS, and it is impossible to actively reduce the load and save energy during low-rate charging. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a combined charging and thermal management control system and method. The maximum power of thermal management can be adjusted based on the charging rate, achieving high-power heat dissipation at high charging rates and low-power heat dissipation at low charging rates.

[0007] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a combined charging and thermal management control system, comprising: A charging system, configured to calculate a charging rate based on the charging current and the power battery capacity in a constant current charging mode, and send the charging rate to the thermal management system; The thermal management system is used to receive charging rate information and dynamically set the maximum operating power according to the charging rate, while performing frequency modulation control based on the system's target temperature and water outlet temperature.

[0008] Furthermore, when the charging rate is ≥1C, the maximum operating power of the thermal management system is set to 100% of the rated power.

[0009] Furthermore, when the charging rate is ≥0.75C and <1C, the maximum operating power of the thermal management system is set to 80% of the rated power.

[0010] Furthermore, when the charging rate is ≥0.5C and <0.75C, the maximum operating power of the thermal management system is set to 60% of the rated power.

[0011] Furthermore, when the charging rate is less than 0.5C, the maximum operating power of the thermal management system is set to 50% of the rated power.

[0012] Furthermore, the charging system starts joint control with the thermal management system only in the constant current charging mode.

[0013] Furthermore, the frequency modulation control includes: dynamically adjusting the cooling power output within a set maximum power range according to the difference between the battery target temperature and the actual water outlet temperature.

[0014] In a second aspect, the present invention provides a method for combined control of charging and thermal management, comprising: The charging system calculates the charging rate in constant current charging mode and sends the charging rate to the thermal management system; The thermal management system sets the maximum operating power according to the charging rate, and performs frequency modulation control based on the target temperature and the water outlet temperature.

[0015] Furthermore, the setting of the maximum operating power includes: If the charging rate is ≥1C, set the maximum power to 100% of the rated power; If the charging rate is ≥0.75C and <1C, set the maximum power to 80% of the rated power; If the charging rate is ≥0.5C and <0.75C, set the maximum power to 60% of the rated power; If the charging rate is less than 0.5C, set the maximum power to 50% of the rated power.

[0016] Furthermore, the combined control is enabled only in the constant current charging mode, and the frequency modulation control includes: real-time monitoring of the difference between the target temperature and the water outlet temperature, and dynamically adjusting the cooling power based on the difference.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a combined charging and thermal management control system and method. The maximum power of thermal management can be adjusted based on the charging rate, achieving high-power heat dissipation at high charging rates and low-power heat dissipation at low charging rates. This realizes the combined control of the charging system and the thermal management system, ensuring energy saving for the entire vehicle; and realizes the maximum power limit of the thermal management system, reducing the noise of the entire vehicle while ensuring the charging and cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a control flow chart of a charging and thermal management combined control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] Example 1, as Figure 1 As shown, this embodiment introduces a charging and thermal management combined control system, which consists of a charging system and a TMS thermal management system; The charging system can determine whether it is in constant current mode or constant voltage mode according to the charging state, and can enter the joint control system in the constant current mode; The charging system can calculate the charging rate based on the actual charging current and the power battery capacity, and send the charging rate information to the TMS water cooling unit, which can set the maximum power according to the charging rate; The charging rate of the charging system is ≥1C, and the maximum power requested from the TMS is 100%. The TMS then performs frequency modulation control of the system according to the system target temperature and the water outlet temperature; The charging rate of the charging system is ≥0.75C and <1C, and the maximum power requested from the TMS is 80%. The TMS then performs frequency modulation control of the system according to the system target temperature and the water outlet temperature; The charging rate of the charging system is ≥0.5C and <0.75C, and the maximum power requested from the TMS is 60%. The TMS then performs frequency modulation control of the system according to the system target temperature and the water outlet temperature; The charging rate of the charging system is less than 0.5C, and the maximum power requested from the TMS is 50%. The TMS then performs frequency modulation control of the system according to the target temperature of the system and the water outlet temperature; This embodiment realizes the associated control of the charging rate of the charging system and the water-cooling unit TMS, and limits the maximum operating power of the TMS based on the charging rate; based on experiments, a correlation relationship between the charging rate and the maximum power of the TMS water-cooling unit is developed.

[0021] This embodiment provides a combined charging and thermal management control system. The maximum thermal management power can be adjusted based on the charging rate, achieving high-power heat dissipation at high charging rates and low-power heat dissipation at low charging rates. This realizes the combined control of the charging system and the thermal management system, ensuring energy saving for the entire vehicle. It also implements a maximum power limit for the thermal management system, reducing vehicle noise while ensuring charging and cooling effects.

[0022] Example 2: This example provides a method for combined control of charging and thermal management, applicable to the system described in any one of Example 1, including: The charging system calculates the charging rate in constant current charging mode and sends the charging rate to the thermal management system; The thermal management system sets the maximum operating power according to the charging rate, and performs frequency modulation control based on the target temperature and the water outlet temperature.

[0023] The setting of the maximum operating power includes: If the charging rate is ≥1C, set the maximum power to 100% of the rated power; If the charging rate is ≥0.75C and <1C, set the maximum power to 80% of the rated power; If the charging rate is ≥0.5C and <0.75C, set the maximum power to 60% of the rated power; If the charging rate is less than 0.5C, set the maximum power to 50% of the rated power.

[0024] The combined control is enabled only in constant current charging mode, and the frequency modulation control includes: real-time monitoring of the difference between the target temperature and the water outlet temperature, and dynamic adjustment of the cooling power based on the difference.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A combined charging and thermal management control system, characterized in that: include: A charging system, configured to calculate a charging rate based on the charging current and the power battery capacity in a constant current charging mode, and send the charging rate to the thermal management system; The thermal management system is used to receive charging rate information and dynamically set the maximum operating power according to the charging rate, while performing frequency modulation control based on the system's target temperature and water outlet temperature.

2. The charging and thermal management combined control system according to claim 1, characterized in that: When the charging rate is ≥1C, the maximum operating power of the thermal management system is set to 100% of the rated power.

3. The charging and thermal management combined control system according to claim 1, characterized in that: When the charging rate is ≥0.75C and <1C, the maximum operating power of the thermal management system is set to 80% of the rated power.

4. The charging and thermal management combined control system according to claim 1, characterized in that: When the charging rate is ≥0.5C and <0.75C, the maximum operating power of the thermal management system is set to 60% of the rated power.

5. The charging and thermal management combined control system according to claim 1, characterized in that: When the charging rate is less than 0.5C, the maximum operating power of the thermal management system is set to 50% of the rated power.

6. The charging and thermal management combined control system according to claim 1, characterized in that: The charging system starts joint control with the thermal management system only in the constant current charging mode.

7. The charging and thermal management combined control system according to claim 1, characterized in that: The frequency modulation control includes: dynamically adjusting the cooling power output within a set maximum power range according to the difference between the battery target temperature and the actual water outlet temperature.

8. A method for combined control of charging and thermal management, characterized in that: include: The charging system calculates the charging rate in constant current charging mode and sends the charging rate to the thermal management system; The thermal management system sets the maximum operating power according to the charging rate, and performs frequency modulation control based on the target temperature and the water outlet temperature.

9. The charging and thermal management combined control method according to claim 8, characterized in that: The setting of the maximum operating power includes: If the charging rate is ≥1C, set the maximum power to 100% of the rated power; If the charging rate is ≥0.75C and <1C, set the maximum power to 80% of the rated power; If the charging rate is ≥0.5C and <0.75C, set the maximum power to 60% of the rated power; If the charging rate is less than 0.5C, set the maximum power to 50% of the rated power.

10. The charging and thermal management combined control method according to claim 8, characterized in that: The combined control is enabled only in constant current charging mode, and the frequency modulation control includes: real-time monitoring of the difference between the target temperature and the water outlet temperature, and dynamic adjustment of the cooling power based on the difference.

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