An intelligent power unit auxiliary braking control strategy

Abstract

The present invention discloses an intelligent power unit auxiliary braking control strategy, which belongs to the field of auxiliary braking technology and solves the technical problem that the power consumption of the anti-drag resistance simply relying on the extended-range power system combination cannot meet the requirements. The auxiliary braking strategy is applied to the intelligent power unit auxiliary braking structure; the intelligent power unit auxiliary braking structure includes: a vehicle controller, an intelligent power unit assembly controller, a power distribution unit, an intelligent cooling system controller, a DC-DC converter, an engine controller, a generator controller, a drive motor controller, a temperature sensor, a cooling fan, a cooling water pump, an engine, a generator, and a drive motor. When the vehicle needs auxiliary braking when going downhill, the engine braking power consumption strategy, the cooling fan power consumption strategy, and the cooling water pump power consumption strategy are selected according to the power consumption for combined use, which can effectively improve the auxiliary braking power of the intelligent power unit and meet customer requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary braking, and more specifically, to an intelligent power unit auxiliary braking control strategy. Background Art

[0002] The intelligent power unit consists of a core extended-range power system (engine + generator + motor controller) and various subsystems that maintain the operation of this system, including intake and exhaust subsystems, fuel supply subsystems, thermal management subsystems, suspension subsystems, frame subsystems, control subsystems, etc.

[0003] The intelligent power unit is mainly used in hybrid chassis. When the vehicle is operating normally, the intelligent power unit acts as a power generation unit and an energy storage unit to provide power for chassis driving and upper operation, and replenishes the energy storage unit with electricity according to the SOC level. In the working condition of the vehicle using electric retarding auxiliary braking, when the energy storage unit is at a higher SOC level or on a long downhill, in order to prevent energy recovery from overcharging the energy storage unit, the intelligent power unit acts as a power consumption unit, consuming part of the braking energy to reduce the mechanical braking heat load, improve the safety of long slope braking and protect the safety of the energy storage unit.

[0004] At present, the power consumption of the intelligent power unit is mainly through the generator of the range-extended power system as a drive motor to consume power to drag the engine to rotate at high speed. At this time, the engine does not spray oil, and relies on the friction of the range-extended power system body plus the engine exhaust brake or cylinder brake resistance to form a combined anti-drag resistance. The greater the anti-drag resistance, the greater the generator drive power consumption, and thus the greater the power consumption of the intelligent power unit auxiliary brake. The combined anti-drag resistance of a range-extended power system is fixed at a certain speed, and the anti-drag power consumption is also limited.

[0005] The higher the auxiliary braking power consumption, the more beneficial it is to the safety of the entire vehicle. Therefore, customers often have higher requirements for this indicator. However, simply relying on the anti-drag power consumption of the extended-range power system combination often fails to meet customer requirements. Summary of the invention

[0006] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. The purpose of the present invention is to provide an intelligent power unit auxiliary braking control strategy that can effectively improve the auxiliary braking power of the intelligent power unit.

[0007] The technical solution of the present invention is: an intelligent power unit auxiliary braking control strategy, the auxiliary braking strategy is applied to the intelligent power unit auxiliary braking structure;

[0008] The intelligent power unit auxiliary braking structure includes: a vehicle controller, an intelligent power unit assembly controller, a power distribution unit, an intelligent cooling system controller, a DC-DC converter, an engine controller, a generator controller, a drive motor controller, a temperature sensor, a cooling fan, a cooling water pump, an engine, a generator, and a drive motor;

[0009] The vehicle controller signal is connected to the intelligent power unit assembly controller and the power distribution unit, the intelligent power unit assembly controller signal is connected to the intelligent cooling system controller, the DC-DC converter, the engine controller, and the generator controller, the intelligent cooling system controller signal is connected to the cooling fan and the cooling water pump, the engine controller signal is connected to the engine, the generator controller signal is connected to the generator, and the intelligent cooling system controller signal is connected to the temperature sensor;

[0010] The high-voltage line of the power distribution unit is connected to the DC-DC converter, the generator controller, and the drive motor controller; the low-voltage line of the DC-DC converter is connected to the cooling fan and the cooling water pump; the high-voltage line of the generator controller is connected to the generator; and the high-voltage line of the drive motor controller is connected to the drive motor;

[0011] When the vehicle needs auxiliary braking when going downhill, the vehicle controller calculates the power consumption; the vehicle controller sends a high-voltage power consumption request and power consumption to the intelligent power unit assembly controller and the power distribution unit;

[0012] When the power consumption is less than or equal to the maximum braking power of the engine, the power consumption is used as the target power of the engine to execute the engine braking power consumption strategy;

[0013] When the power consumption is greater than the maximum braking power of the engine and less than or equal to the maximum braking power of the engine + the full-speed rotation power of the cooling fan, the maximum braking power of the engine is used as the engine target power, and the engine braking power consumption strategy is executed; at the same time, the power consumption minus the maximum braking power of the engine is used as the cooling fan target power, and the cooling fan power consumption strategy is executed;

[0014] When the power consumption is greater than the maximum braking power of the engine + the full-speed rotation power of the cooling fan, the maximum braking power of the engine is used as the engine target power, and the engine braking power consumption strategy is executed; the full-speed rotation power of the cooling fan is used as the cooling fan target power, and the cooling fan power consumption strategy is executed; at the same time, the power consumption - the maximum braking power of the engine - the full-speed rotation power of the cooling fan is used as the cooling water pump target power, and the cooling water pump power consumption strategy is executed.

[0015] As a further improvement, the engine braking power consumption strategy is as follows: the intelligent power unit assembly controller sends a speed control instruction to the generator controller according to the engine target power, and the generator controller controls the generator to drag the engine to the corresponding speed according to the speed control instruction; at the same time, the intelligent power unit assembly controller sends an engine braking request to the engine controller, and the engine controller sends a stop injection instruction to the engine, and the engine performs reverse braking power consumption at this speed;

[0016] When the vehicle does not need auxiliary braking, the vehicle controller stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller cancels the high-voltage power consumption request, and cancels the engine controller sending the stop injection command, and requests the engine to return to idle speed. After the engine returns to idle speed, it works to generate electricity or shuts down according to the power request sent by the vehicle controller.

[0017] Further, the cooling fan power consumption strategy is: the intelligent cooling system controller simultaneously receives the temperature signal sent by the temperature sensor and the braking power request sent by the intelligent power unit assembly controller, and the braking power request has the highest priority;

[0018] When the intelligent cooling system controller receives the braking power request, it sends a cooling fan speed control signal to the cooling fan, and the cooling fan can be infinitely adjusted to a corresponding speed according to the cooling fan target power;

[0019] When the vehicle does not need auxiliary braking, the vehicle controller stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller cancels the high-voltage power consumption request, and cancels the intelligent cooling system controller sending the cooling fan speed control signal, and the intelligent cooling system controller returns to the temperature control mode.

[0020] Further, the cooling water pump power consumption strategy is: the intelligent cooling system controller simultaneously receives the temperature signal sent by the temperature sensor and the braking power request sent by the intelligent power unit assembly controller, and the braking power request has the highest priority;

[0021] When the intelligent cooling system controller receives the braking power request, it sends a cooling water pump speed control signal to the cooling water pump, and the cooling water pump can be infinitely adjusted to a corresponding speed according to the cooling water pump target power;

[0022] When the vehicle does not need auxiliary braking, the vehicle controller stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller cancels the high-voltage power consumption request, and cancels the intelligent cooling system controller sending the cooling water pump speed control signal, and the intelligent cooling system controller returns to the temperature control mode.

[0023] Furthermore, the energy recovery consumption path of the engine braking power consumption strategy is: drive motor→drive motor controller→power distribution unit→generator controller→generator→engine.

[0024] Furthermore, the energy recovery consumption path of the cooling fan power consumption strategy is: drive motor→drive motor controller→power distribution unit→DC-DC converter→cooling fan.

[0025] Furthermore, the energy recovery consumption path of the cooling water pump power consumption strategy is: drive motor→drive motor controller→power distribution unit→DC-DC converter→cooling water pump.

[0026] Furthermore, the spray stop instruction is an EBC1 spray stop instruction.

[0027] Beneficial Effects

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The present invention optimizes the temperature-controlled ATS system by adjusting the control strategy. When the vehicle requires a large auxiliary braking power, in addition to the reverse braking work of the original extended-range power system, the ATS can also control the cooling fan and the cooling water pump to force the work to consume electrical power and achieve the improvement of the combined braking power; and it can be reasonably allocated and combined according to the auxiliary braking power required by the vehicle. It can effectively improve the auxiliary braking power of the intelligent power unit to meet customer requirements, thereby improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the auxiliary braking structure of the intelligent power unit in the present invention;

[0031] Figure 2 It is a schematic diagram of the energy recovery consumption path in the present invention;

[0032] Figure 3 This is a structural diagram of the hybrid chassis power system equipped with an intelligent power unit.

[0033] Among them: 1-temperature sensor, 2-cooling fan, 3-cooling water pump, 4-engine, 5-generator, 6-drive motor, VCU-vehicle controller, RCU-intelligent power unit assembly controller, PDU-power distribution unit, ATS-intelligent cooling system controller, DCDC-DC-DC converter, ECU-engine controller, GCU-generator controller, MCU-drive motor controller. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0035] The power system structure of the hybrid chassis equipped with an intelligent power unit is as follows: Figure 3 As shown, it includes a vehicle controller VCU, an intelligent power unit assembly controller RCU, a power distribution unit PDU, an intelligent cooling system controller ATS, a DC-DC converter DCDC, an engine controller ECU, a generator controller GCU, a drive motor controller MCU, a battery management system BMS, a temperature sensor 1, a cooling fan 2, a cooling water pump 3, an engine 4, a generator 5, a drive motor 6, and an energy storage system 7. The intelligent power unit is composed of an intelligent power unit assembly controller RCU, an intelligent cooling system controller ATS, a DC-DC converter DCDC, an engine controller ECU, a generator controller GCU, a temperature sensor 1, a cooling fan 2, a cooling water pump 3, an engine 4, and a generator 5. The vehicle chassis electrical system is composed of a vehicle controller VCU, a power distribution unit PDU, a drive motor controller MCU, a battery management system BMS, a drive motor 6, and an energy storage system 7.

[0036] Furthermore, the intelligent power unit is composed of a core extended-range power system (i.e., engine + generator + motor controller) and various subsystems that maintain the operation of the extended-range power system, including intake and exhaust subsystems, fuel supply subsystems, thermal management subsystems, suspension subsystems, frame subsystems, control subsystems, etc.

[0037] See also Figure 1-2 , an intelligent power unit auxiliary braking control strategy, the auxiliary braking strategy is applied to the intelligent power unit auxiliary braking structure.

[0038] The intelligent power unit auxiliary braking structure includes: vehicle controller VCU, intelligent power unit assembly controller RCU, power distribution unit PDU, intelligent cooling system controller ATS, DC-DC converter DCDC, engine controller ECU, generator controller GCU, drive motor controller MCU, temperature sensor 1, cooling fan 2, cooling water pump 3, engine 4, generator 5, drive motor 6. The temperature sensor 1 is used to detect whether the range extender power system (i.e. engine + generator) needs to turn on the cooling fan 2 and cooling water pump 3 for cooling. The temperature sensor 1 can be a coolant sensor or an air temperature sensor. The engine 4 is connected to the generator 5 by mechanical rotation.

[0039] The vehicle controller VCU signal is connected to the intelligent power unit assembly controller RCU and the power distribution unit PDU. The intelligent power unit assembly controller RCU signal is connected to the intelligent cooling system controller ATS, the DC-DC converter DCDC, the engine controller ECU, and the generator controller GCU. The intelligent cooling system controller ATS signal is connected to the cooling fan 2 and the cooling water pump 4. The engine controller ECU signal is connected to the engine 4. The generator controller GCU signal is connected to the generator 5. The intelligent cooling system controller ATS signal is connected to the temperature sensor 1.

[0040] The high-voltage line of the power distribution unit PDU is connected to the DC-DC converter DCDC, the generator controller GCU, and the drive motor controller MCU. The low-voltage line of the DC-DC converter DCDC is connected to the cooling fan 2 and the cooling water pump 3. The high-voltage line of the generator controller GCU is connected to the generator 5. The high-voltage line of the drive motor controller MCU is connected to the drive motor 6.

[0041] When the vehicle needs auxiliary braking when going downhill, the vehicle controller VCU calculates the power consumption (calculating power consumption is a prior art and will not be described here). The vehicle controller VCU sends a high-voltage power consumption request and power consumption to the intelligent power unit assembly controller RCU and the power distribution unit PDU.

[0042] When the electric power consumption is less than or equal to the maximum braking power of the engine 4, the electric power consumption is used as the engine target power, and the engine braking power consumption strategy is executed.

[0043] When the power consumption is greater than the maximum braking power of the engine 4, and less than or equal to the maximum braking power of the engine 4 + the full-speed rotation power of the cooling fan 2, the maximum braking power of the engine 4 is used as the engine target power, and the engine braking power consumption strategy is executed; at the same time, the power consumption minus the maximum braking power of the engine 4 is used as the cooling fan target power, and the cooling fan power consumption strategy is executed.

[0044] When the power consumption is greater than the maximum braking power of the engine 4 + the full-speed rotation power of the cooling fan 2, the maximum braking power of the engine 4 is used as the engine target power, and the engine braking power consumption strategy is executed; the full-speed rotation power of the cooling fan 2 is used as the cooling fan target power, and the cooling fan power consumption strategy is executed; at the same time, the power consumption - the maximum braking power of the engine 4 - the full-speed rotation power of the cooling fan 2 is used as the cooling water pump target power, and the cooling water pump power consumption strategy is executed.

[0045] The strategy of engine braking power consumption is as follows: the intelligent power unit assembly controller RCU sends a speed control instruction to the generator controller GCU according to the engine target power, and the generator controller GCU controls the generator 5 to drag the engine 4 to the corresponding speed according to the speed control instruction. At the same time, the intelligent power unit assembly controller RCU sends an engine braking request to the engine controller ECU, and the engine controller ECU sends a stop injection instruction to the engine 4, and the engine 4 performs reverse drag braking power consumption at this speed.

[0046] In this embodiment, an engine power consumption and speed MAP table is prepared in advance, the engine speed corresponding to each power consumption is calibrated in the engine power consumption and speed MAP table, and the target speed can be obtained by querying the engine power consumption and speed MAP table according to the engine target power, and the generator 5 drags the engine 4 to the target speed.

[0047] When the vehicle does not need auxiliary braking, the vehicle controller VCU stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller RCU cancels the high-voltage power consumption request, and cancels the engine controller ECU sending the stop spray command, and requests the engine 4 to return to idle speed. After the engine 4 returns to idle speed, it will work to generate electricity or shut down according to the power request sent by the vehicle controller VCU. The stop spray command is the EBC1 stop spray command.

[0048] The cooling fan power consumption strategy is: the intelligent cooling system controller ATS simultaneously receives the temperature signal sent by the temperature sensor 1 and the braking power request sent by the intelligent power unit assembly controller RCU, and the braking power request has the highest priority.

[0049] When the intelligent cooling system controller ATS receives the braking power request, it sends a cooling fan speed control signal to cooling fan 2, and cooling fan 2 can be infinitely adjusted to a corresponding speed according to the cooling fan target power.

[0050] When the vehicle does not need auxiliary braking, the vehicle controller VCU stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller RCU cancels the high-voltage power consumption request, and cancels the intelligent cooling system controller ATS sending the cooling fan speed control signal, and the intelligent cooling system controller ATS returns to the temperature control mode. The temperature control mode is: ATS starts and stops the cooling fan and cooling water pump and controls the speed according to the set control logic when the temperature signal sent by the temperature sensor reaches the set value.

[0051] The power consumption strategy of the cooling water pump is as follows: the intelligent cooling system controller ATS simultaneously receives the temperature signal sent by the temperature sensor 1 and the braking power request sent by the intelligent power unit assembly controller RCU, and the braking power request has the highest priority.

[0052] When the intelligent cooling system controller ATS receives the braking power request, it sends a cooling water pump speed control signal to the cooling water pump 3. The cooling water pump 3 can be infinitely adjusted to a corresponding speed according to the cooling water pump target power.

[0053] When the vehicle does not need auxiliary braking, the vehicle controller VCU stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller RCU cancels the high-voltage power consumption request, and cancels the cooling water pump speed control signal sent by the intelligent cooling system controller ATS, and the intelligent cooling system controller ATS returns to temperature control mode.

[0054] like Figure 2 As shown, the energy recovery consumption path of the engine braking power consumption strategy is: drive motor 6 → drive motor controller MCU → power distribution unit PDU → generator controller GCU → generator 5 → engine 4.

[0055] The energy recovery consumption path of the cooling fan power consumption strategy is: drive motor 6 → drive motor controller MCU → power distribution unit PDU → DC-DC converter DCDC → cooling fan 2.

[0056] The energy recovery consumption path of the cooling water pump power consumption strategy is: drive motor 6 → drive motor controller MCU → power distribution unit PDU → DC-DC converter DCDC → cooling water pump 3.

[0057] The present invention optimizes the temperature-controlled ATS system by adjusting the control strategy. When the vehicle requires a large auxiliary braking power, in addition to the reverse braking work of the original extended-range power system, the ATS can also control the cooling fan and cooling water pump to force the work to consume electrical power and achieve the improvement of the combined braking power; and it can reasonably distribute and combine the auxiliary braking power required by the vehicle to improve the auxiliary braking power of the intelligent power unit.

[0058] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An intelligent power unit auxiliary braking control strategy, characterized in that: The auxiliary braking strategy is applied to the intelligent power unit auxiliary braking structure; The intelligent power unit auxiliary braking structure comprises: a vehicle control unit (VCU), an intelligent power unit assembly controller (RCU), a power distribution unit (PDU), an intelligent cooling system controller (ATS), a direct current-to-direct current converter (DCDC), an engine controller (ECU), a generator controller (GCU), a drive motor controller (MCU), a temperature sensor (1), a cooling fan (2), a cooling water pump (3), an engine (4), a generator (5), and a drive motor (6); The vehicle control unit (VCU) signal is connected to the intelligent power unit assembly controller (RCU) and the power distribution unit (PDU); the intelligent power unit assembly controller (RCU) signal is connected to the intelligent cooling system controller (ATS), the DC-DC converter (DCDC), the engine controller (ECU), and the generator controller (GCU); the intelligent cooling system controller (ATS) signal is connected to the cooling fan (2) and the cooling water pump (4); the engine controller (ECU) signal is connected to the engine (4); the generator controller (GCU) signal is connected to the generator (5); and the intelligent cooling system controller (ATS) signal is connected to the temperature sensor (1); The power distribution unit (PDU) high-voltage line is connected to the DC-DC converter (DCDC), the generator controller (GCU), and the drive motor controller (MCU); the DC-DC converter (DCDC) low-voltage line is connected to the cooling fan (2) and the cooling water pump (3); the generator controller (GCU) high-voltage line is connected to the generator (5); and the drive motor controller (MCU) high-voltage line is connected to the drive motor (6); When the vehicle needs auxiliary braking when going downhill, the vehicle controller (VCU) calculates the power consumption; the vehicle controller (VCU) sends a high-voltage power consumption request and power consumption to the intelligent power unit assembly controller (RCU) and the power distribution unit (PDU); When the power consumption is less than or equal to the maximum braking power of the engine (4), the power consumption is used as the engine target power and the engine braking power consumption strategy is executed; When the power consumption is greater than the maximum braking power of the engine (4) and less than or equal to the maximum braking power of the engine (4) + the full-speed rotation power of the cooling fan (2), the maximum braking power of the engine (4) is used as the engine target power, and the engine braking power consumption strategy is executed; at the same time, the power consumption minus the maximum braking power of the engine (4) is used as the cooling fan target power, and the cooling fan power consumption strategy is executed; When the power consumption is greater than the maximum braking power of the engine (4) + the full-speed rotation power of the cooling fan (2), the maximum braking power of the engine (4) is used as the engine target power, and the engine braking power consumption strategy is executed; the full-speed rotation power of the cooling fan (2) is used as the cooling fan target power, and the cooling fan power consumption strategy is executed; at the same time, the power consumption - the maximum braking power of the engine (4) - the full-speed rotation power of the cooling fan (2) is used as the cooling water pump target power, and the cooling water pump power consumption strategy is executed.

2. The intelligent power unit auxiliary braking control strategy according to claim 1 is characterized in that: The engine braking power consumption strategy is as follows: the intelligent power unit assembly controller (RCU) sends a speed control instruction to the generator controller (GCU) according to the engine target power, and the generator controller (GCU) controls the generator (5) to drag the engine (4) to a corresponding speed according to the speed control instruction; at the same time, the intelligent power unit assembly controller (RCU) sends an engine braking request to the engine controller (ECU), and the engine controller (ECU) sends a stop injection instruction to the engine (4), and the engine (4) performs reverse drag braking power consumption at this speed; When the vehicle does not need auxiliary braking, the vehicle control unit (VCU) stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller (RCU) cancels the high-voltage power consumption request, and cancels the engine control unit (ECU) sending a stop injection instruction, and requests the engine (4) to return to idle speed. After the engine (4) returns to idle speed, it works to generate electricity or shuts down according to the power request sent by the vehicle control unit (VCU).

3. The intelligent power unit auxiliary braking control strategy according to claim 1 is characterized in that: The cooling fan power consumption strategy is as follows: the intelligent cooling system controller (ATS) simultaneously receives the temperature signal sent by the temperature sensor (1) and the braking power request sent by the intelligent power unit assembly controller (RCU), and the braking power request has the highest priority; When the intelligent cooling system controller (ATS) receives a braking power request, it sends a cooling fan speed control signal to the cooling fan (2), and the cooling fan (2) can be infinitely adjusted to a corresponding speed according to the cooling fan target power; When the vehicle does not need auxiliary braking, the vehicle controller (VCU) stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller (RCU) cancels the high-voltage power consumption request, and cancels the intelligent cooling system controller (ATS) sending the cooling fan speed control signal, and the intelligent cooling system controller (ATS) returns to the temperature control mode.

4. The intelligent power unit auxiliary braking control strategy according to claim 1 is characterized in that: The cooling water pump power consumption strategy is as follows: the intelligent cooling system controller (ATS) simultaneously receives the temperature signal sent by the temperature sensor (1) and the braking power request sent by the intelligent power unit assembly controller (RCU), and the braking power request has the highest priority; When the intelligent cooling system controller (ATS) receives a braking power request, it sends a cooling water pump speed control signal to the cooling water pump (3), and the cooling water pump (3) can be infinitely adjusted to a corresponding speed according to the cooling water pump target power; When the vehicle does not need auxiliary braking, the vehicle controller (VCU) stops sending high-voltage power consumption requests and power consumption, the intelligent power unit assembly controller (RCU) cancels the high-voltage power consumption request, and cancels the intelligent cooling system controller (ATS) sending the cooling water pump speed control signal, and the intelligent cooling system controller (ATS) returns to the temperature control mode.

5. The intelligent power unit auxiliary braking control strategy according to claim 1 is characterized in that: The energy recovery consumption path of the engine braking power consumption strategy is: drive motor (6)→drive motor controller (MCU)→power distribution unit (PDU)→generator controller (GCU)→generator (5)→engine (4).

6. The intelligent power unit auxiliary braking control strategy according to claim 1 is characterized in that: The energy recovery consumption path of the cooling fan power consumption strategy is: drive motor (6)→drive motor controller (MCU)→power distribution unit (PDU)→DC-DC converter (DCDC)→cooling fan (2).

7. The intelligent power unit auxiliary braking control strategy according to claim 1, characterized in that: The energy recovery consumption path of the cooling water pump power consumption strategy is: drive motor (6)→drive motor controller (MCU)→power distribution unit (PDU)→DC-DC converter (DCDC)→cooling water pump (3).

8. The intelligent power unit auxiliary braking control strategy according to claim 1 is characterized in that: The spray stop instruction is an EBC1 spray stop instruction.

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