阅读说明：本技术 一种电传动工程机械冷却系统及其控制方法、控制装置 (electric transmission engineering machinery cooling system and control method and control device thereof ) 是由 李萌 刘汉光 王振 于 2019-09-04 设计创作，主要内容包括：本发明公开了一种电传动工程机械冷却系统及其控制方法、控制装置,冷却系统包括：包括第一冷却循环回路、第二冷却循环回路、第三冷却循环回路、制动电阻和冷却风扇；第一冷却循环回路包括第一水泵、发动机水套、第一水散热器；第二冷却循环回路包括第二水泵、水-空中冷器、液压油冷器、传动箱油冷器、第二水散热器；第三冷却循环回路包括第三水泵、电池包水套、电机控制器水套、第三水散热器；第一水散热器、第二水散热器、第三水散热器及制动电阻共同组成集中散热模块,由冷却风扇为集中散热模块提供冷却空气。通过统筹电传动工程机械的多个热源,按照散热需求及许用温度分为三组,集成到三个冷却循环回路中。(The invention discloses a cooling system of electric transmission engineering machinery, a control method and a control device thereof, wherein the cooling system comprises: the brake device comprises a first cooling circulation loop, a second cooling circulation loop, a third cooling circulation loop, a brake resistor and a cooling fan; the first cooling circulation loop comprises a first water pump, an engine water jacket and a first water radiator; the second cooling circulation loop comprises a second water pump, a water-air cooler, a hydraulic oil cooler, a transmission case oil cooler and a second water radiator; the third cooling circulation loop comprises a third water pump, a battery pack water jacket, a motor controller water jacket and a third water radiator; the first water radiator, the second water radiator, the third water radiator and the brake resistor jointly form a centralized heat radiation module, and the cooling fan provides cooling air for the centralized heat radiation module. A plurality of heat sources of the electric transmission engineering machinery are arranged in three groups according to heat dissipation requirements and allowable temperatures and integrated into three cooling circulation loops.)

1. the electric transmission engineering machinery cooling system is characterized by comprising a first cooling circulation loop, a second cooling circulation loop, a third cooling circulation loop, a brake resistor and a cooling fan;

The first cooling circulation loop comprises a first water pump, an engine water jacket and a first water radiator; the first cooling circulation loop cooling liquid is driven by a first water pump and sequentially flows through an engine water jacket and a first water radiator, and the heat dissipation capacity of the engine is taken away by cooling air through the first water radiator;

The second cooling circulation loop comprises a second water pump, a water-air cooler, a hydraulic oil cooler, a transmission case oil cooler and a second water radiator; the cooling liquid of the second cooling circulation loop is driven by a second water pump and sequentially flows through a water-air cooler, a hydraulic oil cooler, transmission case oil cooling and a second water radiator, and the cooling liquid absorbs the heat of the pressurized air, the heat of the hydraulic oil and the heat of the transmission case oil and is taken away by cooling air through the second water radiator;

The third cooling circulation loop comprises a third water pump, a battery pack water jacket, a motor controller water jacket and a third water radiator; the cooling liquid of the third cooling circulation loop is driven by a third water pump and sequentially flows through the battery pack water jacket, the motor controller water jacket and a third water radiator, and the heat dissipation capacity of the battery pack and the motor controller absorbed by the cooling liquid is taken away by cooling air through the third water radiator;

The first water radiator, the second water radiator, the third water radiator and the brake resistor jointly form a centralized heat radiation module, and the cooling fan provides cooling air for the centralized heat radiation module.

2. The electric engineering machinery cooling system of claim 1, wherein the first water pump, the second water pump, and the third water pump are all electronic pumps, and electric energy of the electronic pumps is provided by a motor braking energy recovery rechargeable battery pack.

3. The electrical engineering machinery cooling system of claim 1, wherein the first water radiator, the second water radiator, and the third water radiator are arranged side by side, and the braking resistor is arranged in series with the first water radiator, the second water radiator, and the third water radiator and is disposed on an air outlet side of the first water radiator, the second water radiator, and the third water radiator.

4. The electrical work machine cooling system of claim 1, wherein the cooling fan is a continuously variable fan driven by a hydraulic motor.

5. a control method for a cooling system of an electric transmission engineering machine is characterized by comprising the following steps:

Acquiring a current signal of a brake resistor, and temperature signals of an outlet coolant of a water jacket of an engine, outlet temperature of an air side of a water-air intercooler, hydraulic oil temperature, transmission case oil temperature, a motor controller and a battery pack;

And controlling the rotating speeds of the cooling fan and the water pump according to the current signal of the brake resistor and the temperature signal, so as to control the cooling air quantity and the cooling liquid flow and keep the temperature of each heat source within a proper working temperature range.

6. The method for controlling the cooling system of the electric engineering machine according to claim 5, wherein the controlling of the rotation speeds of the cooling fan and the water pump according to the current signal of the brake resistor and the temperature signal comprises:

Judging whether the vehicle is in a braking state or not according to the current signal of the braking resistor;

And controlling the rotating speeds of the cooling fan and the water pump according to the temperature signals in response to the judgment that the vehicle is in the non-braking state.

7. The method for controlling the cooling system of the electric engineering machine according to claim 6, wherein the controlling of the rotation speeds of the cooling fan and the water pump according to the respective temperature signals in response to the judgment that the vehicle is in the non-braking state comprises:

when the temperature signals do not exceed the respective set starting temperature values, sending an instruction to control the water pumps of the cooling circulation loops to operate at the set lowest rotating speed, wherein the rotating speed of the cooling fan is zero;

when one or more temperature signals are higher than the set starting temperature but not higher than the set target temperature, sending an instruction to control the water pumps of the cooling circulation loops to operate at the set lowest rotating speed, wherein the rotating speed of the cooling fan is the set lowest rotating speed;

When one or more temperature signals are higher than the set target temperature, the rotating speed of the water pump of the corresponding cooling circulation loop is increased proportionally until the corresponding temperature signal is detected to be equal to the set target temperature; when the rotating speed of the water pump reaches the maximum set rotating speed and the temperature signal is still higher than the set target temperature, the rotating speed of the cooling fan is increased in proportion until the corresponding temperature signal is detected to be equal to the set target temperature.

8. The method for controlling the cooling system of the electric engineering machine according to claim 5, wherein the controlling of the rotation speeds of the cooling fan and the water pump according to the current signal of the brake resistor and the temperature signal comprises:

Judging whether the vehicle is in a braking state or not according to the current signal of the braking resistor;

And controlling the rotating speeds of the cooling fan and the water pump according to the braking current signal and each temperature signal in response to the judgment that the vehicle is in the braking state.

9. The method for controlling the cooling system of the electric engineering machine according to claim 8, wherein the step of controlling the rotation speeds of the cooling fan and the water pump according to the brake current signal and the temperature signals in response to the judgment that the vehicle is in the braking state comprises the steps of:

Calculating the required rotating speed N0 of the cooling fan according to the brake current signal;

When the temperature signals do not exceed the respective set target temperatures, sending an instruction to control the water pumps of the cooling circulation loops to operate at the set lowest rotating speed, wherein the rotating speed of the cooling fan is N0;

when one or more temperature signals are higher than the set target temperature, the rotating speed of the water pump of the corresponding cooling circulation loop is increased proportionally until the corresponding temperature signal is detected to be equal to the set target temperature; when the rotating speed of the water pump reaches the maximum set rotating speed and the corresponding temperature signal is still higher than the set target temperature, the rotating speed of the cooling fan is increased in proportion until the corresponding temperature signal is detected to be equal to the set target temperature.

10. An electric work machine cooling system control apparatus, comprising a memory for storing instructions for controlling the processor to operate to perform the electric work machine cooling system control method according to any one of claims 5 to 9, and a processor.

11. an electric working machine, characterized by comprising a cooling system of an electric working machine according to any of claims 1-4.

12. the electric work machine of claim 11, further comprising the electric work machine cooling system control of claim 10.

Technical Field

the invention belongs to the technical field of electric transmission engineering machinery, and particularly relates to a cooling system of electric transmission engineering machinery, and a control method and a control device thereof.

background

Different from the traditional engineering machinery, the working condition of the high-power electric transmission engineering vehicle is complicated and changeable in the actual use process, and the heat-generating components are more: the hydraulic brake system comprises components such as an engine, a hydraulic system and a transmission case which are shared by the traditional engineering machinery, and also comprises specific electric components such as a motor controller, a battery pack and a brake resistor. All heat-generating parts need work in suitable temperature range, therefore, electric drive engineering vehicle's cooling system needs to pool all heat-generating parts, rationally matches each part heat exchanger and cooling fan amount of wind, prevents that the part is too cold or overheated.

the cooling system of the traditional engineering vehicle is mostly composed of a cooling fan and a radiator module, the radiator module generally comprises an air-air inter-cooler, a hydraulic oil radiator, a transmission oil radiator and an engine water radiator, the wind resistance of the radiator module is large, the size is large, the layout is limited by a power cabin space form, the cooling fan adopts an engine spindle to transmit in a fixed proportion through a belt pulley, cooling liquid circulates through a mechanical water pump, the flow is constant, the heat dissipation requirements of heat sources under different working conditions cannot be met, the problems that heat source parts are too cold or too hot, the energy consumption of the cooling system is high, the noise is high, the operation efficiency of the whole machine is low and the like.

at present, part of engineering vehicles are provided with independent radiating systems which are composed of variable speed fans, radiator modules and controllers thereof, and compared with the traditional engineering vehicle cooling systems, the fans are generally driven by hydraulic motors, and the controllers control the rotating speed of the fans according to the temperature of each cooling medium, so that the cooling intensity of equipment is adjusted. However, the flow of the cooling liquid cannot be adjusted, the requirements of all radiators cannot be considered at the same time, the control strategy is simple, the temperature of the cooling medium fluctuates in a large range, and the cooling effect is poor.

Disclosure of Invention

The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a cooling system of an electric transmission engineering machine, and a control method and a control device thereof.

The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:

According to a first aspect of the present invention, there is provided an electric drive engineering machine cooling system including a first cooling circulation circuit, a second cooling circulation circuit, a third cooling circulation circuit, a brake resistor, and a cooling fan;

the first cooling circulation loop comprises a first water pump, an engine water jacket and a first water radiator; the first cooling circulation loop cooling liquid is driven by a first water pump and sequentially flows through an engine water jacket and a first water radiator, and the heat dissipation capacity of the engine is taken away by cooling air through the first water radiator;

The second cooling circulation loop comprises a second water pump, a water-air cooler, a hydraulic oil cooler, a transmission case oil cooler and a second water radiator; the cooling liquid of the second cooling circulation loop is driven by a second water pump and sequentially flows through a water-air cooler, a hydraulic oil cooler, transmission case oil cooling and a second water radiator, and the cooling liquid absorbs the heat of the pressurized air, the heat of the hydraulic oil and the heat of the transmission case oil and is taken away by cooling air through the second water radiator;

the third cooling circulation loop comprises a third water pump, a battery pack water jacket, a motor controller water jacket and a third water radiator; the cooling liquid of the third cooling circulation loop is driven by a third water pump and sequentially flows through the battery pack water jacket, the motor controller water jacket and a third water radiator, and the heat dissipation capacity of the battery pack and the motor controller absorbed by the cooling liquid is taken away by cooling air through the third water radiator;

the first water radiator, the second water radiator, the third water radiator and the brake resistor jointly form a centralized heat radiation module, and the cooling fan provides cooling air for the centralized heat radiation module.

in some embodiments, the first water pump, the second water pump and the third water pump are all electronic pumps, and electric energy of the electronic pumps is provided by a rechargeable battery pack which is powered by a motor and used for recovering energy.

In some embodiments, the first water radiator, the second water radiator and the third water radiator are arranged side by side, and the braking resistor is arranged in series with the first water radiator, the second water radiator and the third water radiator and is arranged on the air outlet side of the first water radiator, the second water radiator and the third water radiator. The displacement adjusting piece can be an oil cylinder, an electric cylinder, a worm gear and a steel wire rope.

In some embodiments, the cooling fan is a continuously variable fan driven by a hydraulic motor.

According to another aspect of the invention, a method for controlling a cooling system of an electric engineering machine is provided, which includes:

Acquiring a current signal of a brake resistor, and temperature signals of an outlet coolant of a water jacket of an engine, outlet temperature of an air side of a water-air intercooler, hydraulic oil temperature, transmission case oil temperature, a motor controller and a battery pack;

And controlling the rotating speeds of the cooling fan and the water pump according to the current signal of the brake resistor and the temperature signal, so as to control the cooling air quantity and the cooling liquid flow and keep the temperature of each heat source within a proper working temperature range.

according to the current signal of the brake resistor and the temperature signal, the rotating speed of the cooling fan and the water pump is controlled, and the method comprises the following steps:

Judging whether the vehicle is in a braking state or not according to the current signal of the braking resistor;

A. In some embodiments, in response to determining that the vehicle is in a non-braking state, controlling the cooling fan and water pump rotational speeds based on the respective temperature signals includes:

When the temperature signals do not exceed the respective set starting temperature values, sending an instruction to control the water pumps of the cooling circulation loops to operate at the set lowest rotating speed, wherein the rotating speed of the cooling fan is zero;

When one or more temperature signals are higher than the set starting temperature but not higher than the set target temperature, sending an instruction to control the water pumps of the cooling circulation loops to operate at the set lowest rotating speed, wherein the rotating speed of the cooling fan is the set lowest rotating speed;

when one or more temperature signals are higher than the set target temperature, the rotating speed of the water pump of the corresponding cooling circulation loop is increased proportionally until the corresponding temperature signal is detected to be equal to the set target temperature (the temperature tolerance is 1); when the rotating speed of the water pump reaches the maximum set rotating speed and the temperature signal is still higher than the set target temperature, the rotating speed of the cooling fan is increased in proportion until the corresponding temperature signal is detected to be equal to the set target temperature (the temperature tolerance is 1).

B. In other embodiments, in response to determining that the vehicle is in a braking state, controlling the rotational speeds of the cooling fan and the water pump according to the braking current signal and the temperature signals includes:

Calculating the required rotating speed N0 of the cooling fan according to the brake current signal;

when the temperature signals do not exceed the respective set target temperatures, sending an instruction to control the water pumps of the cooling circulation loops to operate at the set lowest rotating speed, wherein the rotating speed of the cooling fan is N0;

when one or more temperature signals are higher than the set target temperature, the rotating speed of the water pump of the corresponding cooling circulation loop is increased proportionally until the corresponding temperature signal is detected to be equal to the set target temperature (the temperature tolerance is 1); when the rotating speed of the water pump reaches the maximum set rotating speed and the corresponding temperature signal is still higher than the set target temperature, the rotating speed of the cooling fan is increased in proportion until the corresponding temperature signal is detected to be equal to the set target temperature (the temperature tolerance is 1).

in some embodiments, the maximum set speed of the water pump is determined by the allowable water resistance of the corresponding cooling circuit.

According to another aspect of the invention, the control device of the cooling system of the electric engineering machine is characterized by comprising a memory and a processor, wherein the memory is used for storing instructions used for controlling the processor to operate so as to execute the control method of the cooling system of the electric engineering machine.

according to another aspect of the invention, the electric engineering machine comprises the electric engineering machine cooling system.

In some embodiments, the electric work machine may further include the electric work machine cooling system control device.

has the advantages that: compared with the prior art, the electric drive engineering machinery cooling system, the control method and the control device thereof provided by the invention have the following advantages:

1. A plurality of heat sources of the whole vehicle are divided into three groups according to heat dissipation requirements and allowable temperatures, the three groups of heat sources are integrated into three cooling circulation loops, and the heat sources are cooled in a water cooling mode, so that the heat exchange efficiency is improved; meanwhile, the water-cooling heat exchanger in the cooling circulation loop is small in size and does not need a fan for cooling, so that the arrangement position is flexible.

2. The water radiators and the brake resistors of the three cooling circulation loops jointly form a centralized heat dissipation module, the three water radiators are arranged side by side, the brake resistors are located on the air outlet side of the radiators and are provided with cooling air by the same cooling fan, and the cooling air firstly flows through the water radiators and then flows through the brake resistors with higher temperature to take away heat. The arrangement mode has small wind resistance and low fan power consumption, and a cooling fan is not required to be independently arranged for the brake resistor, so that the energy utilization rate of the whole vehicle is improved.

3. according to the cooling system control strategy provided by the invention, the rotating speed of the water pump and the rotating speed of the fan are controlled through the braking current signal and the temperature signals of all heat sources, the cooling requirements of the braking resistor and other heat sources are met, and the control precision of the temperature of the heat sources is improved. In the control process, a method of preferentially increasing the rotating speed of the water pump and then increasing the rotating speed of the fan to meet the cooling requirement is adopted, so that the noise of the fan is reduced to the maximum extent.

a plurality of heat production parts are planned en bloc, each cooling element of reasonable layout cooling system matches each water pump flow and cooling fan amount of wind rationally under different work condition through control strategy, makes each heat production part work in suitable temperature range.

drawings

FIG. 1 is a schematic view of a first cooling circuit according to an embodiment of the present invention;

FIG. 2 is a schematic view of a second cooling circuit according to an embodiment of the present invention;

FIG. 3 is a schematic view of a third cooling cycle according to an embodiment of the present invention;

Fig. 4 is a layout diagram of a centralized heat dissipation module according to an embodiment of the present invention.

Detailed Description

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may also include different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.