WO2022213020A1 - Commande de direction d'écoulement de ventilateur dans des machines industrielles - Google Patents

Commande de direction d'écoulement de ventilateur dans des machines industrielles Download PDF

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Publication number
WO2022213020A1
WO2022213020A1 PCT/US2022/071177 US2022071177W WO2022213020A1 WO 2022213020 A1 WO2022213020 A1 WO 2022213020A1 US 2022071177 W US2022071177 W US 2022071177W WO 2022213020 A1 WO2022213020 A1 WO 2022213020A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
traveling direction
fan
moving
response
Prior art date
Application number
PCT/US2022/071177
Other languages
English (en)
Inventor
Rohit Saha
Original Assignee
Cummins Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cummins Inc. filed Critical Cummins Inc.
Priority to CN202280026012.4A priority Critical patent/CN117321293A/zh
Publication of WO2022213020A1 publication Critical patent/WO2022213020A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/04—Pump-driving arrangements
    • F01P5/043—Pump reversing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/044—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using hydraulic drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/13—Ambient temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/32—Engine outcoming fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/62—Load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/66—Vehicle speed

Definitions

  • the present disclosure relates generally to fan flow control in an internal combustion engine, and more particularly, to controlling fan flow direction in response to a traveling direction of a vehicle.
  • Vehicle systems utilizing internal combustion engines can have high demand cooling requirements.
  • industrial machines such as wheel loaders, compactors, road rollers, etc. generally require a cooling system to cool the engine during operation to avoid engine damage.
  • the cooling system typically includes a radiator, also referred to as a heat exchanger, to cool the engine along with a fan drive system.
  • the fan drive system plays an integral part in cooling the engine and operates to force air flow through the radiator in order to facilitate and manage engine temperature.
  • the present disclosure includes a system and method of operating a vehicle system.
  • the method includes operating a vehicle system with an engine to propel a vehicle in a first traveling direction or in a second traveling direction opposite the first traveling direction.
  • the vehicle system includes a cooling system including coolant to cool the engine and a fan rotating in a first direction.
  • the method includes receiving one or more operating parameters for operating the vehicle system, the operating parameters being associated with a temperature condition of the coolant.
  • the method also includes determining the vehicle is moving in one of the first traveling direction and the second traveling direction in response to the temperature condition associated with the coolant.
  • the method further includes maintaining the fan rotating in the first direction in response to determining the vehicle is moving in the first traveling direction and reversing the direction of rotation of the fan in response to determining the vehicle is moving in the second traveling direction.
  • a vehicle system in another embodiment, includes an engine to propel a vehicle in a first traveling direction or in a second traveling direction opposite the first traveling direction, a cooling system including coolant to cool the engine and a fan rotating in a first direction, and an electronic control system operatively coupled with the engine and the cooling system.
  • the electronic control system may be configured to receive one or more operating parameters for operating the vehicle system, the operating parameters being associated with a temperature condition of the coolant.
  • the electronic control system may be configured to determine the vehicle is moving in one of the first traveling direction and the second traveling direction in response to the temperature condition of the coolant.
  • the electronic control system may also be configured to maintain the fan rotating in the first direction in response to determining the vehicle is moving in the first traveling direction and reversing the direction of rotation of the fan in response to determining the vehicle is moving in the second traveling direction.
  • FIG. 1 is a schematic diagram of a vehicle according to an example embodiment of a wheel-loader or similar machine.
  • FIG. 2 is a schematic diagram illustrating certain aspects of a vehicle system of the vehicle in FIG. 1.
  • FIG. 3 is a schematic diagram illustrating certain aspects of an electronic control system in the vehicle system.
  • FIG. 4 is a flow diagram illustrating an example operating procedure of the vehicle system.
  • FIG. 5 is a flow diagram illustrating an example operating procedure of the vehicle system.
  • the present disclosure relates to controlling fan flow direction in response to a travel direction of a vehicle with operating components including an engine and cooling system.
  • a rotating direction of a fan in the cooling system is configured to suck air or blow air in response to the travel direction of the vehicle.
  • the travel direction of the vehicle is determined in response to a temperature of coolant provided to the engine.
  • the vehicle 100 may be in the form of a wheel loader including an engine 102, a cab 104, a lift arm 106, wheels 108, and a front end loader 110.
  • Wheel loaders 100 are generally used to load or move material dirt, rocks, demolition debris, construction material, etc. It should be understood, however, the present disclosure is not limited to wheel loaders, and other vehicles are contemplated.
  • the engine 102 may be an internal combustion engine such as, for example, a diesel or gasoline engine, capable of providing a mechanical or electrical power output that can be converted to hydraulic power.
  • the engine 102 operates at an engine speed and provides an engine torque.
  • the vehicle 100 may be provided with an electronic control system (ECS) 112 which is configured and operable to receive operator inputs from operator controls provided in the cab 104 and to control operation of the vehicle 100 in response thereto including in the manners further described below.
  • ECS electronice control system
  • the control system 112 may include a controller structured to perform certain operations and to receive and interpret signals from any component and/or sensor of the engine system 100.
  • the controller may be provided in a variety of forms and configurations including one or more computing devices forming a whole or a part of a processing subsystem having non-transitory memory storing computer-executable instructions, processing, and communication hardware.
  • the controller may be a single device or a distributed device, and the functions of the controller may be performed by hardware or software.
  • the controller is in communication with any actuators, sensors, datalinks, computing devices, wireless connections, or other devices to be able to perform any described operations.
  • the controller may include one or more non-transitory memory devices configured to store instructions in memory which are readable and executable by the controller to control operation of engine 102 as described herein.
  • Certain control operations described herein include operations to determine one or more parameters.
  • the controller may be configured to determine and may perform acts of determining in a number of manners, for example, by calculating or computing a value, obtaining a value from a lookup table or using a lookup operation, receiving values from a datalink or network communication, receiving an electronic signal (e.g ., a voltage, frequency, current, or pulse-width modulation (PWM) signal) indicative of the value, receiving a parameter indicative of the value, reading the value from a memory location on a computer-readable medium, receiving the value as a run-time parameter, and/or by receiving a value by which the interpreted parameter can be calculated, and/or by referencing a default value that is interpreted to be the parameter value.
  • PWM pulse-width modulation
  • the controller is one example of a component of the ECS 112 that may be configured to control various operational aspects of vehicle 100 and engine 102 as described in further detail herein.
  • the ECS 112 according to the present disclosure may be implemented in a number of forms and may include a number of different elements and configurations of elements.
  • the ECS 112 may incorporate one or more microprocessor-based or microcontroller-based electronic control units sometimes referred to as electronic control modules.
  • the ECS 112 according to the present disclosure may be provided in forms having a single processing or computing component, or in forms comprising a plurality of operatively coupled processing or computing components; and may comprise digital circuitry, analog circuitry, or a hybrid combination of both of these types.
  • the integrated circuitry of the ECS 112 and/or any of its constituent processors/controllers or other components may include one or more signal conditioners, modulators, demodulators, arithmetic logic units (ALUs), central processing units (CPUs), limiters, oscillators, control clocks, amplifiers, signal conditioners, filters, format converters, communication ports, clamps, delay devices, memory devices, analog to digital (A/D) converters, digital to analog (D/A) converters, and/or different circuitry or functional components as would occur to those skilled in the art to provide and perform the communication and control aspects disclosed herein.
  • ALUs arithmetic logic units
  • CPUs central processing units
  • limiters oscillators
  • control clocks amplifiers
  • signal conditioners filters
  • format converters communication ports
  • clamps delay devices
  • memory devices analog to digital (A/D) converters, digital to analog (D/A) converters, and/or different circuitry or functional components as would occur to those skilled in the art to provide and perform the communication and
  • FIG. 2 there is a schematic diagram illustrating certain aspects of a vehicle system 200 of the vehicle 100 in FIG. 1.
  • the engine 102 is configured to output torque to a propulsion system 202 and a hydraulic system 204 both of which may impose a load on the engine 102 which may vary depending on the operational state of the vehicle 100, its surrounding environment, and inputs from operator controls.
  • the engine propulsion system 202 may include a transmission and other powertrain or driveline components configured and operable to propel the vehicle 100 by driving the wheels 108.
  • the engine hydraulics system 204 may comprise a number of components and subsystems including working hydraulics 206 and cooling system 208.
  • the working hydraulics 206 may be operably coupled to a work mechanism 214 and may include components such as a motor, pump, hydraulic actuators, and other components.
  • the work mechanism 214 may include mechanically powered components such as the lift arm 106 and front end loader 110 that the working hydraulics 206 provide power to implement.
  • the work mechanism 214 may include mechanically powered take-offs, components, or implements (e.g., a drill/auger, a drag, a backhoe, a jaw) where the working hydraulics 206 provides power to implement these components.
  • the cooling system 210 may receive circulating hydraulic fluid from one or more other components and subsystems of hydraulic system 204 and provide power to fan 216 that moves air through the cooling system 210.
  • the cooling system 210 circulates liquid coolant throughout various channels cast into an engine block (not shown) which houses the engine 102.
  • the coolant may be heated by the engine 102 as the coolant travels through the channels and then later cooled for recirculation by a heat exchanger (not shown).
  • the cooling system 210 includes fan 216 to move air through the cooling system 210 and facilitate cooling of the engine 102 and temperature of the coolant.
  • fan 216 is a hydrostatic fan that is direction-reversible in response to a command from ECS 112.
  • FIG. 3 there is a schematic diagram illustrating certain aspects of the ECS 112 in the vehicle system 200.
  • the ECS 112 may be operably coupled to the engine 102 and configured to receive a number of input signals from sensors operably coupled to components that operate the vehicle system 200.
  • the vehicle system 200 may be configured with sensors for sensing one or more operating parameters 302 including, but not limited to, engine load 304, coolant temperature 306, compressor inlet temperature 308, fan speed 310, estimated ambient temperature 312, and load event time 314.
  • the ECU 112 may be configured with one or more memory devices 303 to store the operating parameters 302.
  • One of the memory devices 303 may include a look-up table that stores one or more values for each of the operating parameters 302.
  • each of the operating parameters 302 may be associated with one or more vehicle loading events.
  • the ECS 112 may be configured to store a value corresponding to each of the engine load 304 of a vehicle loading event, the coolant temperature 306 of the vehicle loading event, the compressor inlet temperature 308 of the vehicle loading event, and the fan speed 310 of the vehicle loading event.
  • the ECS 112 may also be configured to store a value corresponding to the estimated ambient temperature 312 during the vehicle loading event where the estimated ambient temperature 312 may be based on the compressor inlet temperature 308 or other input.
  • the ECS 112 may be configured to store a value corresponding to the span of time 314 of performing the vehicle loading event.
  • the ECS 112 may be configured to perform a machine learning process that executes a machine learning algorithm.
  • the machine learning algorithm may be configured to automatically determine values for the one or more operating parameters 302 in response to received input signals and stored data corresponding to each vehicle loading event.
  • the ECS 112 may be configured with an algorithm that determines an estimated coolant temperature for each of the vehicle loading events.
  • the estimated coolant temperature may also be stored in a look-up table in one of memory devices 303 where the estimated coolant temperature is determined based on one or more of the operating parameters 302.
  • Procedure 400 may be implemented and executed in connection with one or more components of the ECS 112 described above in connection with the vehicle system 200 or in connection with a number of other ECS components.
  • Procedure 400 begins at start operation 402 and proceeds to conditional 404 which determines if a gear lever in the vehicle 100 is positioned to drive the vehicle forward or reverse.
  • procedure 400 proceeds to operation 406 where the ECS 112 is configured to control a rotating direction of the fan 216 flow direction-1 to suck or blow air away from the engine 102 to reduce hot air recirculation around the engine 102, such as when the fan 216 is mounted on the rear of engine 102 and the vehicle is moving forward. From operation 406, procedure 400 proceeds to operation 410 which updates a hydrostatic drive rotation of the fan 216, accordingly.
  • procedure 400 proceeds to operation 408 where the ECS 112 is configured to control a rotating direction of the fan 216 flow direction-2 to suck or blow air toward the engine 102 to reduce hot air recirculation from the engine 102 so that hot air is not blown in the direction of travel of the vehicle. From operation 408, procedure 400 proceeds to operation 410 which updates a hydrostatic drive rotation of the fan 216, accordingly.
  • Procedure 500 may be implemented and executed in connection with one or more components of the ECS 112 described above in connection with the vehicle system 200 or in connection with a number of other ECS components.
  • Procedure 500 begins at start operation 502 and proceeds to operation 504 that senses one or more operating parameters including, but not limited to, engine load, a coolant temperature, a compressor inlet temperature, and fan speed.
  • procedure 500 proceeds to operation 506 that estimates an ambient temperature of the vehicle 100 based on, for example, the compressor inlet temperature. From operation 506, procedure 500 proceeds to operation 508 that detects a loading pattern or loading event of the vehicle 100 over a particular time span. From operation 508, procedure 500 proceeds to conditional 510 to determine if the engine 102 is idling. If conditional 510 determines that the engine 102 is idling, procedure 500 proceeds to operation 520 which maintains a current rotating direction of the fan 216 during the idling of the engine 102.
  • procedure 500 proceeds to operation 512 that calculates a moving average of the engine load based on a time span detected by a vehicle loading event. It shall be appreciated that the ECS 112 may be configured to store a pre-calibrated number for the average engine load based on a time span for a vehicle loading event. From operation 512, procedure 500 proceeds to operation 514 that looks-up an estimated coolant temperature from a predefined table which stores a coolant temperature associated with one or more of the average engine load, fan speed, estimated ambient temperature, and other operating parameters corresponding to a respective vehicle loading event.
  • procedure 500 proceeds to conditional 516 to determine if an actual coolant temperature is greater than an estimated coolant temperature. If conditional 516 determines that an actual coolant temperature is less than an estimated coolant temperature, procedure 500 proceeds to operation 518 which determines that the vehicle 100 is moving in a first traveling direction. From operation 518, procedure 500 proceeds to operation 520 which maintains the current rotating direction of the fan 216. For example, if the fan 216 is rotating in a first direction when the vehicle 100 is moving in a first traveling direction, operation 520 keeps the fan 216 rotating in the first direction.
  • conditional 516 determines that an actual coolant temperature is greater than or equal to an estimated coolant temperature
  • procedure 500 proceeds to operation 522 which determines that the vehicle 100 is moving in a second traveling direction opposite the first traveling direction. From operation 522, procedure 500 proceeds to conditional 524 that determines if the vehicle 100 is moving in the second traveling direction for more than a predetermined amount of time. If conditional 524 determines that the vehicle 100 is moving in the second traveling direction for less than the predetermined amount of time, procedure 500 proceeds to operation 520 that keeps the fan 216 rotating in the first direction. If conditional 524 determines that the vehicle 100 is moving in the second traveling direction for more than the predetermined amount of time, procedure 500 proceeds to operation 526 which reverses a rotating direction of the fan 216 from the first direction to provide increased cooling for the engine 102.
  • One example embodiment is a method comprising operating a vehicle system including an engine to propel a vehicle in a first traveling direction or in a second traveling direction opposite the first traveling direction, the vehicle system including a cooling system including coolant to cool the engine and a fan rotating in a first direction, receiving one or more operating parameters for operating the vehicle system, the operating parameters associated with a temperature condition of the coolant, determining the vehicle is moving in one of the first traveling direction and the second traveling direction in response to the temperature condition of the coolant, and maintaining the fan rotating in the first direction in response to determining the vehicle is moving in the first traveling direction and reversing the direction of rotation of the fan in response to determining the vehicle is moving in the second traveling direction.
  • the operating parameters include at least one of an engine load, a fan rotation speed and direction, and an ambient temperature of the vehicle.
  • the method further includes determining at least one of the engine load, the fan rotation speed and direction, and the ambient temperature for one or more vehicle loading events.
  • the method includes determining an estimated coolant temperature associated with one or more vehicle loading events.
  • determining the vehicle is moving in one of the first traveling direction and the second traveling direction includes determining the vehicle is moving in the second traveling direction in response to an actual coolant temperature associated with one or more vehicle loading events being greater than an estimated coolant temperature.
  • controlling the fan to rotate in the second direction includes first determining the vehicle is moving in the second traveling direction for more than a predetermined amount of time, wherein the fan is controlled to continue rotating in the first direction in response to the vehicle moving in the second traveling direction for less than the predetermined amount of time.
  • the method further includes maintaining the fan rotating in the first direction in response to determining that the vehicle is idle.
  • the first traveling direction is a forward moving direction of the vehicle and the second traveling direction is a backward moving direction of the vehicle.
  • Another example embodiment is a vehicle system comprising an engine to propel a vehicle in a first traveling direction or in a second traveling direction opposite the first traveling direction, a cooling system including coolant to cool the engine and a fan rotating in a first direction, and an electronic control system operatively coupled with the engine and the cooling system, the electronic control system being configured to receive one or more operating parameters for operating the vehicle system, the operating parameters associated with a temperature condition of the coolant, determine that the vehicle is moving in one of the first traveling direction and the second traveling direction in response to the temperature condition of the coolant, and maintain the fan rotating in the first direction in response to determining the vehicle is moving in the first traveling direction and reversing the direction of rotation of the fan in response to determining the vehicle is moving in the second traveling direction.
  • the operating parameters include at least one of an engine load, a fan rotation speed and direction, and an ambient temperature of the vehicle.
  • the electronic control system is further configured to determine at least one of the engine load, the fan rotation speed and direction, and the ambient temperature for one or more vehicle loading events.
  • the electronic control system is further configured to determine an estimated coolant temperature associated with one or more vehicle loading events.
  • the electronic control system is further configured to determine the vehicle is moving in the second traveling direction in response to an actual coolant temperature associated with one or more vehicle loading events being greater than an estimated coolant temperature.
  • the electronic control system is configured to control the fan to continue rotating in the first direction in response to the actual coolant temperature being at or less than the estimated coolant temperature. In certain forms, the electronic control system is configured to control the fan to rotate in a second direction opposite the first direction in response to the actual coolant temperature being greater than the estimated coolant temperature. In certain forms, the electronic control system is configured to control the fan to rotate in the second direction includes first determining the vehicle is moving in the second traveling direction for more than a predetermined amount of time, wherein the electronic control system is configured to control the fan to continue rotating in the first direction in response to the vehicle moving in the second traveling direction for less than the predetermined amount of time.
  • the electronic control system is further configured to maintain the fan rotating in the first direction in response to determining that the vehicle is idle.
  • the first traveling direction is a forward moving direction of the vehicle and the second traveling direction is a backward moving direction of the vehicle.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

L'invention concerne un procédé et un système de commande de la direction d'écoulement d'un ventilateur dans un véhicule. Le procédé consiste à recevoir un ou plusieurs paramètres de fonctionnement permettant de faire fonctionner le système du véhicule, et à déterminer si le véhicule se déplace dans une première direction de déplacement ou dans une seconde direction de déplacement en réponse à une température d'un agent de refroidissement. Le procédé consiste également à maintenir une direction de rotation du ventilateur lorsqu'il a été établi que le véhicule se déplace dans la première direction de déplacement, et à inverser la direction de rotation du ventilateur lorsqu'il a été établi que le véhicule se déplace dans la seconde direction de déplacement.
PCT/US2022/071177 2021-04-01 2022-03-16 Commande de direction d'écoulement de ventilateur dans des machines industrielles WO2022213020A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280026012.4A CN117321293A (zh) 2021-04-01 2022-03-16 工业机器中的风扇流动方向控制

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202163169520P 2021-04-01 2021-04-01
US63/169,520 2021-04-01

Publications (1)

Publication Number Publication Date
WO2022213020A1 true WO2022213020A1 (fr) 2022-10-06

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ID=83456902

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2022/071177 WO2022213020A1 (fr) 2021-04-01 2022-03-16 Commande de direction d'écoulement de ventilateur dans des machines industrielles

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CN (1) CN117321293A (fr)
WO (1) WO2022213020A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030183433A1 (en) * 2000-05-09 2003-10-02 Mackelvie Winston Bi-directional automotive cooling fan
US20050192727A1 (en) * 1994-05-09 2005-09-01 Automotive Technologies International Inc. Sensor Assemblies
US20110303472A1 (en) * 2007-09-04 2011-12-15 Honda Motor Co., Ltd. Variable Pitch Radiator Fan Control System

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050192727A1 (en) * 1994-05-09 2005-09-01 Automotive Technologies International Inc. Sensor Assemblies
US20030183433A1 (en) * 2000-05-09 2003-10-02 Mackelvie Winston Bi-directional automotive cooling fan
US20110303472A1 (en) * 2007-09-04 2011-12-15 Honda Motor Co., Ltd. Variable Pitch Radiator Fan Control System

Also Published As

Publication number Publication date
CN117321293A (zh) 2023-12-29

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