CN117681614A - Control method and cooling system for cooling system of electric engineering machinery - Google Patents
Control method and cooling system for cooling system of electric engineering machinery Download PDFInfo
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- CN117681614A CN117681614A CN202311582385.2A CN202311582385A CN117681614A CN 117681614 A CN117681614 A CN 117681614A CN 202311582385 A CN202311582385 A CN 202311582385A CN 117681614 A CN117681614 A CN 117681614A
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- 238000001816 cooling Methods 0.000 title claims abstract description 275
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 52
- 238000005057 refrigeration Methods 0.000 claims abstract description 52
- 238000004378 air conditioning Methods 0.000 claims abstract description 21
- 230000017525 heat dissipation Effects 0.000 claims abstract description 17
- 239000000110 cooling liquid Substances 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000003507 refrigerant Substances 0.000 claims description 17
- 238000010583 slow cooling Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 7
- 230000001276 controlling effect Effects 0.000 claims 1
- 239000002826 coolant Substances 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 11
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Abstract
The invention discloses a control method of an electric engineering machinery cooling system and the cooling system, wherein the system comprises an electric heat dissipation system, an integrated air conditioning system and a battery cooling system; the method comprises the following steps: acquiring monitoring data of a cooling system, and judging the refrigerating demand degree of a cab and a battery pack BMS cooling request mode according to the monitoring data; executing corresponding refrigeration instructions according to the refrigerating demand degree of the cab and the battery pack BMS cooling request mode; when the cab cooling demand level or the battery pack BMS cooling request mode changes, the operation is ended. The method comprises the steps of acquiring monitoring data of a cooling system, accurately judging the refrigerating demand degree of a cab and the cooling request mode of a battery pack BMS, adopting a mode of independent control of double electronic fans to realize accurate heat dissipation of a condenser and a radiator, and adaptively adjusting the rotating speed of a compressor and the rotating speed of the electronic fans, so that reasonable cold distribution of the cab and the battery pack is effectively realized through low energy consumption, and driving comfort and safety are guaranteed.
Description
Technical Field
The invention relates to the technical field of control of pure electric excavators, in particular to a control method and a cooling system of an electric engineering machine cooling system.
Background
Because of the limitation of space arrangement, the small-sized pure electric excavator needs to integrate an air conditioner evaporator and a battery cooler in parallel in the air conditioner system in consideration of the cooling requirement of the battery system, and shares a compressor, wherein the air conditioner evaporator is used for meeting the cooling of a cab, and the battery cooler is used for cooling a power battery. Under the condition that the refrigerating capacity of the air conditioning system is sufficient, the balanced distribution of air conditioning refrigeration and battery cooling is realized rapidly and accurately, the service life of the battery can be effectively prolonged, and the working stability of the system can be effectively improved.
In the prior art, a dual electronic expansion valve mode is generally adopted, and respective opening degree control of the air-conditioning side electronic expansion valve and the battery side electronic expansion valve is obtained through calculation, so that bidirectional cold energy distribution is realized.
The other scheme is that the cooling liquid flow is regulated by adopting a speed regulating water pump in a mode of combining an electronic expansion valve with a battery cooler so as to realize cold compensation regulation, and the scheme needs to repeatedly start and stop the compressor, so that the energy consumption is greatly increased, and the driving comfort is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a control method and a cooling system for an electric engineering machine cooling system, which effectively realize reasonable cold distribution of a cab and a battery pack and ensure driving comfort and safety.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a control method for an electric engineering machine cooling system, including the steps of:
acquiring monitoring data of a cooling system, and judging the refrigerating demand degree of a cab and a battery pack BMS cooling request mode according to the monitoring data;
executing corresponding refrigeration instructions according to the refrigerating demand degree of the cab and the battery pack BMS cooling request mode;
when the cab cooling demand level or the battery pack BMS cooling request mode changes, the operation is ended.
Further, obtain cooling system's monitoring data, according to monitoring data judges driver's cabin refrigeration demand degree and battery package BMS cooling request mode, include:
if the cab has no refrigeration requirement, only the battery pack has a cooling request, and the current cooling request state of the BMS is judged at the moment:
obtaining the highest temperature Tmax of the battery pack battery cell and the average temperature Tmean of the battery pack battery cell;
when the highest temperature Tmax of the battery pack battery cells is larger than or equal to the upper limit Ttop of the cooling threshold, and the average temperature Tmean of the battery pack battery cells is larger than or equal to the upper limit balance point Tpai of the cooling threshold, the battery management system BMS requests a quick cooling mode.
Further, the method is based on a cooling system comprising at least an electric heat dissipation system, an integrated air conditioning system, and a battery cooling system;
the electrical dissipation heat system includes an electrical dissipation heat sink; the fans of the electric radiator are in a double-electronic fan form, and comprise a first electric fan and a second electric fan, and form independent partition temperature control with a condenser of the integrated air conditioning system and a battery radiator of the battery cooling system respectively; the cooling liquid is subjected to air cooling through the electric-driven radiator, wherein the temperature of the electric-driven radiator is independently controlled through the double electronic fans, and an electric-driven heat circulation loop is formed:
the integrated air conditioning system comprises a compressor, a condenser, an electronic expansion valve, a pressure sensor P1 and a temperature sensor arranged on the evaporator;
the battery cooling system comprises a variable-frequency water pump I, a battery cooler and a temperature sensor arranged at an inlet and an outlet of a battery pack; the integrated air conditioning system and the battery cooling system realize heat exchange through the battery cooler;
according to the cab refrigeration demand degree and the battery pack BMS cooling request mode, executing corresponding refrigeration instructions comprises:
when the battery management system BMS only requests a quick cooling mode, a compressor and a first electric fan are started, and the variable-frequency water pump is regulated to 50% of rotating speed;
initializing the opening of the electronic expansion valve, comprehensively calculating temperature feedback values T1 and T2 of cooling liquid at the inlet and the outlet of the battery pack, dynamically adjusting the opening of the electronic expansion valve at the speed of N1 steps/s, and ending when the adjustment reaches the highest energy efficiency ratio by taking the target superheat degree of the battery cooler as a reference;
and the pressure value of the refrigerant loop fed back by the pressure sensor P1 is monitored in real time, and the optimal rotation speeds of the compressor and the condenser fan are matched according to the pressure value of the refrigerant loop until the temperature difference value between T1 and T2 tends to be stable or BMS cooling request mode changes.
Further, obtain cooling system's monitoring data, according to monitoring data judges driver's cabin refrigeration demand degree and battery package BMS cooling request mode, include:
if the cab has no refrigeration requirement, only the battery pack has a cooling request, and the current cooling request state of the BMS is judged at the moment:
obtaining the highest temperature Tmax of the battery pack battery cell and the average temperature Tmean of the battery pack battery cell;
when the highest temperature Tmax of the battery pack battery cells is larger than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery pack battery cells is larger than or equal to the lower limit balance point Tpeak of the cooling threshold, the battery management system BMS requests a slow cooling mode.
Further, the battery cooling system further comprises an electromagnetic valve and a battery radiator; the cooling liquid is divided into two branches through an electromagnetic valve after passing through the variable-frequency water pump I: the first branch passes through the battery radiator and the battery cooler, is commutated through the electromagnetic valve, and then flows through the battery pack to cool the battery radiator; the second branch passes through the electromagnetic valve and the battery cooler, flows through the battery pack to cool the battery pack, and the cooling liquid is in a self-circulation state;
according to the cab refrigeration demand degree and the battery pack BMS cooling request mode, executing corresponding refrigeration instructions comprises:
when only the battery management system BMS requests the slow cooling mode, the compressor is turned off;
adjusting the first electric fan and the second electric fan to corresponding rotating speeds according to the temperature of the electric radiator;
starting a variable-frequency water pump to adjust to 50% of rotating speed;
the electromagnetic valve is adjusted to switch the battery cooling loop to the first branch, and the cooling liquid passes through the battery radiator, exchanges heat through the second electric fan and then passes through the battery pack to be cooled;
and comprehensively calculating temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack, and adjusting the second rotating speed of the electric fan according to the temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack until the temperature difference value between T1 and T2 tends to be stable or the BMS cooling request mode changes.
Further, obtain cooling system's monitoring data, according to monitoring data judges driver's cabin refrigeration demand degree and battery package BMS cooling request mode, include:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is not more than the temperature limit Tdin, the gear of the evaporator blower is not less than the calibration gear Sbe, the highest temperature Tmax of the battery pack battery cell is not less than the upper limit Ttop of the cooling threshold in the state, and the average temperature Tmean of the battery pack battery cell is not less than the upper limit balance point Tpai of the cooling threshold, the cab is in a strong demand state, and the battery management system BMS requests a quick cooling mode.
Further, according to the cab cooling demand level and the battery pack BMS cooling request mode, a corresponding cooling instruction is executed, including:
when the cabin cooling is in a state of strong demand, the battery management system BMS requests the quick cooling mode,
starting the compressor and the first electric fan, initializing the opening of the electronic expansion valve, adjusting the first variable-frequency water pump to 80 percent of rotating speed,
the battery cooling loop is switched to the first branch through the electromagnetic valve, passes through the battery radiator and the battery cooler, flows through the micro-channel of the battery pack through the electromagnetic valve for cooling,
comprehensively calculating temperature feedback values T1 and T2 of cooling liquid at an inlet and an outlet of the battery pack, and lifting the second rotating speed of the electric fan to be maximum in an allowable value so as to realize maximum heat exchange quantity;
according to the system refrigerant pressure and the evaporator surface temperature fed back by the pressure sensor P1 and the temperature sensor T3, matching the rotation speeds of the compressor and the electric fan;
and gradually opening the electronic expansion valve from the initial position by N2 steps/s to reach the optimal heat exchange amount until the temperature difference value between T1 and T2 tends to be stable or the BMS cooling request mode changes. And the optimal heat exchange amount is an optimal solution for obtaining a heat dissipation state according to the current state and by taking the target energy efficiency ratio as a reference.
Further, obtain cooling system's monitoring data, according to monitoring data judges driver's cabin refrigeration demand degree and battery package BMS cooling request mode, include:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is smaller than or equal to the temperature limit Tdin, the gear Sed of the evaporator blower is larger than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery cell is larger than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery pack battery cells is larger than or equal to the lower limit balance point Tpeak of the cooling threshold, the cab is in a strong demand state at this moment, and the battery management system BMS requests a slow cooling mode.
Further, according to the cab cooling demand level and the battery pack BMS cooling request mode, a corresponding cooling instruction is executed, including:
when the cab refrigeration is in a strong demand state and the battery management system BMS requests a slow cooling mode, the compressor is started, the electronic expansion valve is closed,
according to the system refrigerant pressure and the evaporator surface temperature fed back by the pressure sensor P1 and the temperature sensor T3, one rotation speed of the electric fan is adjusted to the corresponding rotation speed,
the variable-frequency water pump is started to be adjusted to 50 percent of rotating speed,
switching to a first branch through an electromagnetic valve, enabling cooling liquid to pass through a battery radiator, exchanging heat through a second electric fan, cooling through a battery pack,
and (3) comprehensively calculating temperature feedback values T1 and T2 of the cooling liquid at the inlet and outlet of the battery pack, and dynamically adjusting the two rotating speeds of the electric fan until the temperature difference value between T1 and T2 tends to be stable or the BMS cooling request mode changes.
Further, obtain cooling system's monitoring data, according to monitoring data judges driver's cabin refrigeration demand degree and battery package BMS cooling request mode, include:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is more than or equal to the temperature limit Tdin and the gear of the evaporator blower is less than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery pack battery cell is more than or equal to the upper cooling threshold value Ttop in the state, and the average temperature Tmean of the battery pack battery cell is more than or equal to the upper cooling threshold value balancing point Tpai, at the moment, the cab refrigeration is in a weak demand state, and the battery management system BMS requests a quick cooling mode.
Further, according to the cab cooling demand level and the battery pack BMS cooling request mode, a corresponding cooling instruction is executed, including:
when the cab refrigeration is in a weak demand state and the battery management system BMS requests a quick cooling mode, the temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack are comprehensively calculated, the rotating speed of the water pump is increased, the maximum flow value is realized,
according to the system refrigerant pressure and the evaporator surface temperature fed back by the pressure sensor P1 and the temperature sensor T3, the rotation speeds of the compressor and the condensing fan are matched,
and initializing the opening of the electronic expansion valve, and gradually opening the electronic expansion valve in N3 steps/s until the optimal heat exchange amount is reached, or the temperature difference value between T1 and T2 is stable or the BMS cooling request mode is changed. And the optimal heat exchange amount is an optimal solution for obtaining a heat dissipation state according to the current state and by taking the target energy efficiency ratio as a reference.
Further, the method for comprehensively calculating the temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack comprises the following steps: and 2 degrees are added on the basis of the inlet and outlet temperature monitoring values acquired by the sensor to serve as temperature feedback values T1 and T2 of the inlet and outlet cooling liquid of the battery pack.
Further, obtain cooling system's monitoring data, according to monitoring data judges driver's cabin refrigeration demand degree and battery package BMS cooling request mode, include:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is more than or equal to the temperature limit Tdin, the gear Sed of the evaporator blower is less than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery cell is more than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery cells is more than or equal to the lower limit balance point Tow of the cooling threshold, the cab refrigeration is in a weak demand state at the moment, and the battery management system BMS requests a slow cooling mode.
Further, according to the cab cooling demand level and the battery pack BMS cooling request mode, a corresponding cooling instruction is executed, including:
when the cabin cooling is in a weak demand state, the battery management system BMS will request a slow cooling mode, turn on the compressor,
the first electric fan is adjusted to a corresponding rotating speed according to the monitored temperature of the electric drive radiator,
the variable-frequency water pump is started to be adjusted to 50 percent of rotating speed,
the electromagnetic valve is adjusted to switch the battery cooling loop to the first branch, so that the cooling liquid passes through the battery radiator, exchanges heat through the second electric fan and then passes through the battery pack to be cooled.
Further, the method further comprises:
when the battery pack is not started, the variable-frequency water pump is controlled to be at an initial rotating speed, the variable-frequency water pump is switched to the second branch through the electromagnetic valve, and the cooling liquid is in a self-circulation state.
In a second aspect, the present invention provides an electric engineering machine cooling system, comprising:
the monitoring system is used for acquiring monitoring data of the cooling system;
a controller for executing the control method according to the first aspect based on the monitoring data.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the monitoring data of the cooling system is obtained, the cooling demand degree of the cab and the cooling request mode of the battery pack BMS are judged according to the monitoring data, corresponding operation instructions are executed through the cooling demand degree of the cab and the cooling request mode of the battery pack BMS, the control flow is clear and definite, the flow is reliable and stable, the reasonable cold distribution of the cab and the battery pack can be effectively realized with low energy consumption, and the driving comfort and the driving safety are ensured.
(2) The condenser and the battery radiator are arranged on the windward side of the electric radiator side by side, the accurate heat dissipation of the condenser and the radiator is realized by adopting a mode of independent control of the double electronic fans, and the rotation speed of the compressor and the rotation speed of the electronic fans are adaptively regulated, so that the reasonable cold distribution of a cab and a battery pack is effectively realized with low energy consumption, and the driving comfort and the driving safety are ensured.
(3) According to the invention, the monitoring data of the cooling system is obtained, the refrigerating demand degree of the cab and the cooling request mode of the battery pack BMS are accurately judged, the secondary cooling of the battery pack is realized by the mode of connecting the variable-frequency water pump I, the battery radiator and the battery cooler in series, meanwhile, the opening of the electronic expansion valve and the rotating speed of the variable-frequency water pump I are dynamically compensated and adjusted, the abrupt change of the temperature inside the cab can be effectively prevented, and the safety and the driving comfort are ensured.
Drawings
FIG. 1 is a schematic diagram of a complete machine thermal management system;
FIG. 2 is a flow chart of a thermal management control system of the whole machine;
FIG. 3 is a block diagram of a battery pack cooling flow;
FIG. 4 is a block diagram of a cooling flow for both the cab and the battery pack;
fig. 5 is a block diagram of a dynamic optimizing cooperative control strategy.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
the embodiment provides a control method of an electric engineering machinery cooling system, based on the cooling system, a schematic diagram of a complete machine thermal management system and a control system flow are shown in fig. 1, 2, 3 and 4:
firstly, a cooling request sent by a cab refrigerating demand and a Battery Management System (BMS) is required to be obtained, the air conditioning system pressure, the battery pack cell temperature, the battery and the electric drive radiator temperature are monitored in real time through a whole machine control module, the cab internal temperature and the external environment temperature are compared, and the rotation speeds of a compressor and an electronic fan, the opening of an electronic expansion valve and the flow of an electronic water pump are precisely controlled.
A cooling system, comprising: as shown in fig. 1, the thermal management system of the small-sized electric engineering machinery mainly comprises an electric heat dissipation system, an integrated air conditioning system and a battery cooling system; the electric heat dissipation system shares a condensing fan with the integrated air conditioning system and the battery cooling system respectively, wherein a condenser of the air conditioning system and a battery radiator of the battery cooling system are arranged on a windward side of the electric heat dissipation system side by side, and simultaneously, the two subsystems realize heat exchange through the battery cooler.
Electric dissipation thermal cycle loop: the cooling liquid flows through the OBC, the motor and the motor controller after passing through the water pump, and then is subjected to air cooling through the electric heat radiator, wherein the temperature of the electric heat radiator is independently controlled through the double electronic fans, the cooling circulation is finally formed, and the expansion kettle, the temperature sensor and the like are arranged in the middle of the loop.
Refrigerant circulation loop of integrated air conditioning system: the refrigerant passing through the compressor and the condenser is divided into two branches, one branch is used for refrigerating the cab through the thermal expansion valve and the evaporator, and the other branch is used for carrying out heat exchange on the battery pack through the electronic expansion valve and the heat exchanger, wherein the condenser and the electric heat dissipater share the electronic fan, and a pressure sensor, a temperature sensor and the like are arranged in the whole circulation loop.
Battery cooling circuit: the cooling liquid is divided into two branches through a three-way electromagnetic valve after passing through the variable-frequency water pump I: one path passes through a battery radiator and a battery cooler, is commutated through two three-way electromagnetic valves, and then flows through a battery pack to cool the battery radiator; the other path passes through a three-way electromagnetic valve and a battery cooler, then flows through a battery pack to cool the battery cooler, and an expansion kettle, a temperature sensor and the like are arranged in the middle of the loop.
The condenser and the battery radiator of the system are arranged side by side on the windward side of the electric heat dissipation device; the electric radiator fan of the system adopts a double-electronic fan mode, and forms independent partition temperature control modes respectively on the condenser and the battery radiator.
Specifically, obtain cooling system's monitoring data, according to monitoring data judges driver's cabin refrigeration demand degree and battery package BMS cooling request mode, include:
cooling request mode of Battery Management System (BMS): firstly, according to the running state of the whole machine, monitoring the signal feedback state of the BMS in real time, and the highest temperature, the lowest temperature and the average temperature of the battery core of the power battery, so as to accurately judge the battery cooling threshold value, acquire the cooling target water temperature and the cooling enabled request zone bit information from the battery cooling threshold value, and enter the cooling request state.
Fig. 5 is a cooperative control part of a dynamic optimizing cooling system, wherein the precise adjustment of the rotation speed, the temperature, the pressure and the flow is realized based on the mode of mutual compensation of fuzzy control and PID control, the system superheat degree and the COP value (energy efficiency ratio) corresponding to the opening degree of an electronic expansion valve under different rotation speeds of a compressor are calibrated and fitted in advance according to experimental results, the initial opening degree and the target superheat degree of the electronic expansion valve are optimized by comprehensively considering the system superheat degree and the COP value, meanwhile, the rotation speed of the compressor is taken as the reference quantity of an opening degree control strategy, the initial value of the target superheat degree and the initial value of the target power are introduced on the basis, finally, the control strategy of associating the rotation speed of the compressor, the rotation speed of a cooling fan, the flow of a variable-frequency water pump and the superheat degree of a battery cooler is taken as an adjustment target is established, and finally, the optimal solution of the cooling state is obtained by the lowest energy consumption is realized.
Specifically, if the cab has no cooling requirement, only the battery pack has a cooling request, and at this time, it is determined whether the current cooling request of the BMS is in the fast cooling mode: when the highest temperature Tmax of the battery pack battery cell is larger than or equal to the upper limit Ttop of the cooling threshold, and the average temperature Tmean of the battery pack battery cell is larger than or equal to the upper limit balance point Tpai of the cooling threshold, the battery management system BMS requests a quick cooling mode, firstly starts the compressor and the first electric fan according to the execution priority of the control system, adjusts the first variable-frequency water pump to 50% of rotating speed, initializes the opening of the electronic expansion valve, comprehensively calculates the temperature feedback values T1 and T2 of the cooling liquid at the inlet and outlet of the battery pack, dynamically adjusts the opening of the expansion valve at the rate of N1 steps/s, monitors the pressure value P1 of a refrigerant loop in real time, and simultaneously matches the optimal rotating speeds of the compressor and the condensing fan.
The temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack are comprehensively calculated, and the temperature feedback values are not directly detected by a temperature sensor, because the initial temperature value is obtained through monitoring of the temperature sensor, and the initial temperature value is required to be compensated by a controller based on safety consideration in order to compensate errors. Specifically, the method for comprehensively calculating the temperature feedback values T1 and T2 of the cooling liquid at the inlet and outlet of the battery pack comprises the following steps: the temperature monitoring value of the inlet and outlet acquired by the sensor is increased by 2 degrees, so that errors are made up, the temperature standard value is compared, the cooling state is delayed, and the temperature of the battery is ensured to enter a safety value.
When the highest temperature Tmax of the battery pack cell is larger than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery pack cell is larger than or equal to the lower limit balance point Tpeak of the cooling threshold, the battery management system BMS requests a slow cooling mode, firstly, the compressor is closed according to the execution priority of the control system, the fan I is firstly adjusted to the corresponding rotating speed according to the monitoring temperature of the electric radiator, the variable-frequency water pump I is started to be adjusted to 50% rotating speed, the electromagnetic valves are started 1 and 2 and closed 3, cooling liquid passes through the battery radiator, heat exchange is carried out through the fan II, cooling is carried out through the battery pack, the temperature feedback values T1 and T2 of the cooling liquid at the inlet and outlet of the battery pack are comprehensively calculated, the fan II rotating speed is dynamically adjusted, and when the temperature difference value of T1/T2 tends to be stable until the BMS cooling request mode disappears.
(2) If the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment: when the temperature set value Tcin in the cab is not more than the temperature limit Tdin, the gear of the evaporator blower is not less than the calibration gear Sbe, the highest temperature Tmax of the battery pack battery cell is not less than the upper limit Ttop of the cooling threshold in the state, and the average temperature Tmean of the battery pack battery cell is not less than the upper limit balance point Tpai of the cooling threshold, the cab is in a strong demand state, and the battery management system BMS requests a quick cooling mode.
Firstly, a compressor and an electric fan I are started, the opening of an electronic expansion valve is initialized, a variable-frequency water pump I is adjusted to 80% of rotating speed, cooling liquid flows through openings 1 and 2 of an electromagnetic valve, passes through a battery radiator and a battery cooler, flows through a battery pack micro-channel through the electromagnetic valve to be cooled, according to the execution priority of a control system, feedback values T1 and T2 of the temperature of the cooling liquid at an inlet and an outlet of the battery pack are comprehensively calculated, the rotating speed of the electric fan II is preferentially increased, the maximum heat exchange quantity is achieved, the rotating speeds of the compressor and the electric fan I are matched according to the system refrigerant pressure and the surface temperature of an evaporator fed back by a pressure sensor P1 and a temperature sensor T3, and the opening of the electronic expansion valve is gradually opened from an initial position by N2 steps/s, so that the optimal heat exchange quantity is achieved. The optimal heat exchange amount is an optimal solution of the heat dissipation state obtained by the system according to the current state and with the target energy efficiency ratio as a reference.
When the battery pack does not need cooling, the water pump is at an initial rotating speed, the solenoid valves 1 and 3 are opened (the solenoid valves are switched to a second branch), and the cooling liquid is in a self-circulation state. At this time, the battery pack is not cooled and is in a cooling excitation state at any time.
(2) When the temperature set value Tcin in the cab is not more than the temperature limit Tdin, the gear Sed of the evaporator blower is not less than the calibration gear Sbe, the highest temperature Tmax of the battery cell is not less than the lower limit Tdow of the cooling threshold in the state, and the average temperature Tmean of the battery pack battery cells is not less than the lower limit balance point Tow of the cooling threshold, the cab refrigeration is in a strong demand state at the moment, and the battery management system BMS requests a slow cooling mode.
According to the execution priority of the control system, firstly, a compressor is started, an electronic expansion valve is closed, a first electric fan is fed back to be adjusted to a corresponding rotating speed according to data of P1 and T3, a variable-frequency water pump is started to be adjusted to a rotating speed of 50%, electromagnetic valves are started 1 and 2, 3 are closed, cooling liquid passes through a battery radiator, heat exchange is carried out through the second electric fan, cooling is carried out through a battery pack, the temperature feedback values T1 and T2 of the inlet and outlet cooling liquid of the battery pack are comprehensively calculated, the rotating speed of the second electric fan is dynamically adjusted, the temperature feedback values T1 and T2 of the inlet and outlet cooling liquid of the battery pack are comprehensively calculated, and when the temperature difference value T1/T2 tends to be stable until a BMS cooling request mode disappears, and the refrigerating capacity requirement of a cab is maintained.
(3) When the temperature set value Tcin in the cab is more than or equal to the temperature limit Tdin and the gear of the evaporator blower is less than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery pack battery cell is more than or equal to the upper cooling threshold value Ttop in the state, and the average temperature Tmean of the battery pack battery cell is more than or equal to the upper cooling threshold value balancing point Tpai, at the moment, the cab refrigeration is in a weak demand state, and the battery management system BMS requests a quick cooling mode. According to the execution priority of the control system, comprehensively calculating temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack, preferentially lifting the rotating speed of the water pump, realizing the maximum flow value, matching the rotating speeds of the compressor and the condensing fan according to the system refrigerant pressure and the surface temperature of the evaporator fed back by the pressure sensor P1 and the temperature sensor T3, initializing the opening of the electronic expansion valve, and gradually opening the electronic expansion valve in N3 steps/s to achieve the optimal heat exchange quantity.
(4) When the temperature set value Tcin in the cab is more than or equal to the temperature limit Tdin, the gear Sed of the evaporator blower is less than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery cell is more than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery cells is more than or equal to the lower limit balance point Tow of the cooling threshold, the cab refrigeration is in a weak demand state at the moment, and the battery management system BMS requests a slow cooling mode. According to the execution priority of the control system, firstly, a compressor is started, a first electric fan is firstly adjusted to a corresponding rotating speed according to the monitoring temperature of an electric radiator, a first variable-frequency water pump is started to adjust to 50% rotating speed, electromagnetic valves are started 1 and 2, 3 are closed, cooling liquid passes through a battery radiator, heat exchange is carried out through a second electric fan, cooling is carried out through a battery pack, the temperature feedback values T1 and T2 of the cooling liquid at an inlet and an outlet of the battery pack are comprehensively calculated, the second rotating speed of the electric fan is dynamically adjusted, and when the temperature difference value T1/T2 tends to be stable until a BMS cooling request mode disappears.
Embodiment two:
the present embodiment provides an electric engineering machine cooling system, including: as shown in fig. 1, the thermal management system of the small-sized electric engineering machinery mainly comprises an electric heat dissipation system, an integrated air conditioning system and a battery cooling system; the electric heat dissipation system shares a condensing fan with the integrated air conditioning system and the battery cooling system respectively, wherein a condenser of the air conditioning system and a battery radiator of the battery cooling system are arranged on a windward side of the electric heat dissipation system side by side, and simultaneously, the two subsystems realize heat exchange through the battery cooler.
Electric dissipation thermal cycle loop: the cooling liquid flows through the OBC, the motor and the motor controller after passing through the water pump, and then is subjected to air cooling through the electric heat radiator, wherein the temperature of the electric heat radiator is independently controlled through the double electronic fans, the cooling circulation is finally formed, and the expansion kettle, the temperature sensor and the like are arranged in the middle of the loop.
Refrigerant circulation loop of integrated air conditioning system: the refrigerant passing through the compressor and the condenser is divided into two branches, one branch is used for refrigerating the cab through the thermal expansion valve and the evaporator, and the other branch is used for carrying out heat exchange on the battery pack through the electronic expansion valve and the heat exchanger, wherein the condenser and the electric heat dissipater share the electronic fan, and a pressure sensor, a temperature sensor and the like are arranged in the whole circulation loop.
Battery cooling circuit: the cooling liquid is divided into two branches through a three-way electromagnetic valve after passing through the variable-frequency water pump I: one path passes through a battery radiator and a battery cooler, is commutated through two three-way electromagnetic valves, and then flows through a battery pack to cool the battery radiator; the other path passes through a three-way electromagnetic valve and a battery cooler, then flows through a battery pack to cool the battery cooler, and an expansion kettle, a temperature sensor and the like are arranged in the middle of the loop.
The condenser and the battery radiator of the system are arranged side by side on the windward side of the electric heat dissipation device;
the electric radiator fan of the system adopts a double-electronic fan mode, and forms independent partition temperature control modes on the condenser and the battery radiator respectively;
the system can realize flow compensation under different flow resistances through the series mode of the variable-frequency water pump, the battery radiator and the battery cooler, and the pre-cooling of the battery radiator and the deep cooling of the battery cooler, namely 'secondary cooling', are used for compensating and adjusting the opening of the electronic expansion valve.
The cooling system is provided with a controller and a monitoring system, wherein the monitoring system is used for acquiring monitoring data in the cooling system, such as a temperature set value Tcin a cab, a gear step Sed of an evaporator blower, a highest temperature Tmax of a battery pack cell and a mean temperature Tmean of the battery pack cell; the controller is configured to execute the control method according to the first embodiment.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (16)
1. The control method of the cooling system of the electric engineering machinery is characterized by comprising the following steps of:
acquiring monitoring data of a cooling system, and judging the refrigerating demand degree of a cab and a battery pack BMS cooling request mode according to the monitoring data;
executing corresponding refrigeration instructions according to the refrigerating demand degree of the cab and the battery pack BMS cooling request mode;
when the cab cooling demand level or the battery pack BMS cooling request mode changes, the operation is ended.
2. The control method of an electric construction machine cooling system according to claim 1, wherein acquiring monitoring data of the cooling system, judging a cab cooling demand level and a battery pack BMS cooling request mode based on the monitoring data, comprises:
if the cab has no refrigeration requirement, only the battery pack has a cooling request, and the current cooling request state of the BMS is judged at the moment:
obtaining the highest temperature Tmax of the battery pack battery cell and the average temperature Tmean of the battery pack battery cell;
when the highest temperature Tmax of the battery pack battery cells is larger than or equal to the upper limit Ttop of the cooling threshold, and the average temperature Tmean of the battery pack battery cells is larger than or equal to the upper limit balance point Tpai of the cooling threshold, the battery management system BMS requests a quick cooling mode.
3. The method of claim 2, wherein the method is based on a cooling system comprising at least an electric dissipation heat system, an integrated air conditioning system, and a battery cooling system;
the electrical dissipation heat system includes an electrical dissipation heat sink; the fans of the electric radiator are in a double-electronic fan form, and comprise a first electric fan and a second electric fan, and form independent partition temperature control with a condenser of the integrated air conditioning system and a battery radiator of the battery cooling system respectively; the cooling liquid is subjected to air cooling through the electric-driven radiator, wherein the temperature of the electric-driven radiator is independently controlled through the double electronic fans, and an electric-driven heat circulation loop is formed:
the integrated air conditioning system comprises a compressor, a condenser, an electronic expansion valve, a pressure sensor P1 and a temperature sensor arranged on the evaporator;
the battery cooling system comprises a variable-frequency water pump I, a battery cooler and a temperature sensor arranged at an inlet and an outlet of a battery pack; the integrated air conditioning system and the battery cooling system realize heat exchange through the battery cooler;
according to the cab refrigeration demand degree and the battery pack BMS cooling request mode, executing corresponding refrigeration instructions comprises:
when the battery management system BMS only requests a quick cooling mode, a compressor and a first electric fan are started, and the variable-frequency water pump is regulated to 50% of rotating speed;
initializing the opening of the electronic expansion valve, comprehensively calculating temperature feedback values T1 and T2 of cooling liquid at the inlet and the outlet of the battery pack, dynamically adjusting the opening of the electronic expansion valve at the speed of N1 steps/s, and ending when the adjustment reaches the highest energy efficiency ratio by taking the target superheat degree of the battery cooler as a reference;
and the pressure value of the refrigerant loop fed back by the pressure sensor P1 is monitored in real time, and the optimal rotation speeds of the compressor and the condenser fan are matched according to the pressure value of the refrigerant loop until the temperature difference value between T1 and T2 tends to be stable or BMS cooling request mode changes.
4. The control method of the cooling system of the electric construction machine according to claim 3, wherein acquiring the monitoring data of the cooling system, judging the cooling demand level of the cab and the cooling request mode of the battery pack BMS according to the monitoring data, comprises:
if the cab has no refrigeration requirement, only the battery pack has a cooling request, and the current cooling request state of the BMS is judged at the moment:
obtaining the highest temperature Tmax of the battery pack battery cell and the average temperature Tmean of the battery pack battery cell;
when the highest temperature Tmax of the battery pack battery cells is larger than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery pack battery cells is larger than or equal to the lower limit balance point Tpeak of the cooling threshold, the battery management system BMS requests a slow cooling mode.
5. The method of controlling an electric work machine cooling system according to claim 4, wherein the battery cooling system further comprises a solenoid valve and a battery radiator; the cooling liquid is divided into two branches through an electromagnetic valve after passing through the variable-frequency water pump I: the first branch passes through the battery radiator and the battery cooler, is commutated through the electromagnetic valve, and then flows through the battery pack to cool the battery radiator; the second branch passes through the electromagnetic valve and the battery cooler, flows through the battery pack to cool the battery pack, and the cooling liquid is in a self-circulation state;
according to the cab refrigeration demand degree and the battery pack BMS cooling request mode, executing corresponding refrigeration instructions comprises:
when only the battery management system BMS requests the slow cooling mode, the compressor is turned off;
adjusting the first electric fan and the second electric fan to corresponding rotating speeds according to the temperature of the electric radiator;
starting a variable-frequency water pump to adjust to 50% of rotating speed;
the electromagnetic valve is adjusted to switch the battery cooling loop to the first branch, and the cooling liquid passes through the battery radiator, exchanges heat through the second electric fan and then passes through the battery pack to be cooled;
and comprehensively calculating temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack, and adjusting the second rotating speed of the electric fan according to the temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack until the temperature difference value between T1 and T2 tends to be stable or the BMS cooling request mode changes.
6. The method according to claim 5, wherein acquiring monitoring data of the cooling system, and determining the degree of cooling demand of the cab and the cooling request mode of the battery pack BMS based on the monitoring data, comprises:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is not more than the temperature limit Tdin, the gear of the evaporator blower is not less than the calibration gear Sbe, the highest temperature Tmax of the battery pack battery cell is not less than the upper limit Ttop of the cooling threshold in the state, and the average temperature Tmean of the battery pack battery cell is not less than the upper limit balance point Tpai of the cooling threshold, the cab is in a strong demand state, and the battery management system BMS requests a quick cooling mode.
7. The method according to claim 6, wherein the step of executing the corresponding cooling command according to the cab cooling demand level and the battery pack BMS cooling request mode comprises:
when the cabin cooling is in a state of strong demand, the battery management system BMS requests the quick cooling mode,
starting the compressor and the first electric fan, initializing the opening of the electronic expansion valve, adjusting the first variable-frequency water pump to 80 percent of rotating speed,
the battery cooling loop is switched to the first branch through the electromagnetic valve, passes through the battery radiator and the battery cooler, flows through the micro-channel of the battery pack through the electromagnetic valve for cooling,
comprehensively calculating temperature feedback values T1 and T2 of cooling liquid at an inlet and an outlet of the battery pack, and lifting the second rotating speed of the electric fan to be maximum in an allowable value so as to realize maximum heat exchange quantity;
according to the system refrigerant pressure and the evaporator surface temperature fed back by the pressure sensor P1 and the temperature sensor T3, matching the rotation speeds of the compressor and the electric fan;
gradually opening the electronic expansion valve from the initial position in N2 steps/s until the optimal heat exchange amount is reached, or the temperature difference value between T1 and T2 tends to be stable or the BMS cooling request mode changes; and the optimal heat exchange amount is an optimal solution for obtaining a heat dissipation state according to the current state and by taking the target energy efficiency ratio as a reference.
8. The method according to claim 7, wherein acquiring monitoring data of the cooling system, and determining the degree of cooling demand of the cab and the cooling request mode of the battery pack BMS based on the monitoring data, comprises:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is smaller than or equal to the temperature limit Tdin, the gear Sed of the evaporator blower is larger than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery cell is larger than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery pack battery cells is larger than or equal to the lower limit balance point Tpeak of the cooling threshold, the cab is in a strong demand state at this moment, and the battery management system BMS requests a slow cooling mode.
9. The control method of an electric construction machine cooling system according to claim 8, wherein the executing the corresponding cooling command according to the cab cooling demand level and the battery pack BMS cooling request mode comprises:
when the cab refrigeration is in a strong demand state and the battery management system BMS requests a slow cooling mode, the compressor is started, the electronic expansion valve is closed,
according to the system refrigerant pressure and the evaporator surface temperature fed back by the pressure sensor P1 and the temperature sensor T3, one rotation speed of the electric fan is adjusted to the corresponding rotation speed,
the variable-frequency water pump is started to be adjusted to 50 percent of rotating speed,
switching to a first branch through an electromagnetic valve, enabling cooling liquid to pass through a battery radiator, exchanging heat through a second electric fan, cooling through a battery pack,
and comprehensively calculating temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack, and dynamically adjusting the rotation speed of the electric fan until the temperature difference value between T1 and T2 tends to be stable or the BMS cooling request mode changes.
10. The control method of an electric construction machine cooling system according to claim 9, wherein acquiring monitoring data of the cooling system, determining a cab cooling demand level and a battery pack BMS cooling request mode based on the monitoring data, comprises:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is more than or equal to the temperature limit Tdin and the gear of the evaporator blower is less than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery pack battery cell is more than or equal to the upper cooling threshold value Ttop in the state, and the average temperature Tmean of the battery pack battery cell is more than or equal to the upper cooling threshold value balancing point Tpai, at the moment, the cab refrigeration is in a weak demand state, and the battery management system BMS requests a quick cooling mode.
11. The control method of an electric construction machine cooling system according to claim 10, wherein the executing the corresponding cooling command according to the cab cooling demand level and the battery pack BMS cooling request mode comprises:
when the cab refrigeration is in a weak demand state and the battery management system BMS requests a quick cooling mode, the temperature feedback values T1 and T2 of the cooling liquid at the inlet and the outlet of the battery pack are comprehensively calculated, the rotating speed of the water pump is increased, the maximum flow value is realized,
according to the system refrigerant pressure and the evaporator surface temperature fed back by the pressure sensor P1 and the temperature sensor T3, the rotation speeds of the compressor and the condensing fan are matched,
initializing the opening of the electronic expansion valve, and gradually opening the electronic expansion valve in N3 steps/s until the optimal heat exchange amount is reached, or the temperature difference value between T1 and T2 tends to be stable, or the BMS cooling request mode changes; and the optimal heat exchange amount is an optimal solution for obtaining a heat dissipation state according to the current state and by taking the target energy efficiency ratio as a reference.
12. The control method of an electric construction machine cooling system according to any one of claims 3, 5, 7, 9, 11, wherein the method of comprehensively calculating the battery pack inlet/outlet coolant temperature feedback values T1, T2 includes: and 2 degrees are added on the basis of the inlet and outlet temperature monitoring values acquired by the sensor to serve as temperature feedback values T1 and T2 of the inlet and outlet cooling liquid of the battery pack.
13. The method according to claim 5, wherein acquiring monitoring data of the cooling system, and determining the degree of cooling demand of the cab and the cooling request mode of the battery pack BMS based on the monitoring data, comprises:
if the requirements of the cab refrigeration and the battery pack cooling exist, judging the state of the cab refrigeration requirement and the current cooling request mode of the BMS at the moment:
acquiring a temperature set value Tcin a cab, an evaporator blower gear Sed, a battery pack cell maximum temperature Tmax and a battery pack cell average temperature Tmean;
when the temperature set value Tcin in the cab is more than or equal to the temperature limit Tdin, the gear Sed of the evaporator blower is less than or equal to the calibration gear Sbe, the highest temperature Tmax of the battery cell is more than or equal to the lower limit Tdow of the cooling threshold, and the average temperature Tmean of the battery cells is more than or equal to the lower limit balance point Tow of the cooling threshold, the cab refrigeration is in a weak demand state at the moment, and the battery management system BMS requests a slow cooling mode.
14. The control method of an electric construction machine cooling system according to claim 13, wherein the executing the corresponding cooling command according to the cab cooling demand level and the battery pack BMS cooling request mode comprises:
when the cabin cooling is in a weak demand state, the battery management system BMS will request a slow cooling mode, turn on the compressor,
the first electric fan is adjusted to a corresponding rotating speed according to the monitored temperature of the electric drive radiator,
the variable-frequency water pump is started to be adjusted to 50 percent of rotating speed,
the electromagnetic valve is adjusted to switch the battery cooling loop to the first branch, so that the cooling liquid passes through the battery radiator, exchanges heat through the second electric fan and then passes through the battery pack to be cooled.
15. The method of claim 5, further comprising:
when the battery pack is not started, the variable-frequency water pump is controlled to be at an initial rotating speed, and the variable-frequency water pump is switched to the second branch through the electromagnetic valve, so that the cooling liquid is in a self-circulation state.
16. An electric engineering machine cooling system, comprising:
the monitoring system is used for acquiring monitoring data of the cooling system;
a controller for executing the control method according to any one of claims 1 to 15 based on the monitoring data.
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| CN202311582385.2A CN117681614A (en) | 2023-11-24 | 2023-11-24 | Control method and cooling system for cooling system of electric engineering machinery |
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| CN202311582385.2A CN117681614A (en) | 2023-11-24 | 2023-11-24 | Control method and cooling system for cooling system of electric engineering machinery |
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