Fan control method, fan control system and vehicle

Abstract

The present invention relates to the technical field of thermal management, and provides a fan control method, a fan control system and a vehicle. The method includes: obtaining the hydraulic oil temperature, the engine coolant temperature and the engine intake air temperature. When the engine coolant temperature reaches a first temperature threshold, if the hydraulic oil temperature is less than a second temperature threshold, controlling the operation of a first electronic fan group in the fan system based on the hydraulic oil temperature, and controlling the operation of a second electronic fan group in the fan system based on the engine intake air temperature; when the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, controlling the operation of a third electronic fan group in the fan system based on the engine coolant temperature. In this way, the problem of low thermal management ability of the fan system is solved, and the thermal management ability of the fan system is improved by decoupling between the fan system and the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management, and particularly to a fan control method, a fan control system and a vehicle. Background Art

[0002] In order to dissipate heat from the engine, a fan system is provided in a vehicle. Currently, the fan system mainly adopts a direct-connected fan and an electronically controlled silicone oil fan.

[0003] Both the direct-connected fan and the electronically controlled silicone oil fan are connected to the engine. Therefore, the rotational speeds of the direct-connected fan and the electronically controlled silicone oil fan are strongly related to the engine speed, and they have a high coupling with the engine. It is impossible to precisely control the direct-connected fan and the electronically controlled silicone oil fan, resulting in a low thermal management ability of the fan system. Summary of the Invention

[0004] The present invention provides a fan control method, a fan control system and a vehicle, which are used to solve the problem of low thermal management ability of the fan system in the related art, and improve the thermal management ability of the fan system.

[0005] The present invention provides a fan control method, including:

[0006] Obtaining the hydraulic oil temperature, the engine coolant temperature and the engine intake air temperature;

[0007] When the engine coolant temperature reaches a first temperature threshold and the hydraulic oil temperature is less than a second temperature threshold, controlling a first electronic fan group in the fan system to operate based on the hydraulic oil temperature, and controlling a second electronic fan group in the fan system to operate based on the engine intake air temperature; the first electronic fan group is used to adjust the hydraulic oil temperature, and the second electronic fan group is used to adjust the engine intake air temperature;

[0008] When the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, controlling a third electronic fan group in the fan system to operate based on the engine coolant temperature, and the third electronic fan group is used to adjust the engine coolant temperature.

[0009] According to the fan control method provided by the present invention, it further includes:

[0010] When the hydraulic oil temperature is greater than or equal to the second temperature threshold, increasing the rotational speeds of the first electronic fan group and the second electronic fan group.

[0011] A fan control method provided by the present invention, wherein the first temperature threshold is the temperature at the end of engine warm-up; the fan control method further includes: when the engine is started, if the engine coolant temperature is less than the first temperature threshold, controlling the first electronic fan group and the third electronic fan group to stop.

[0012] A fan control method provided by the present invention further includes:

[0013] When the engine coolant temperature is greater than the third temperature threshold, determining the initial speed of the third electronic fan group corresponding to the engine coolant temperature based on the correspondence between the engine coolant temperature and the speed of the third electronic fan group, determining the speed adjustment amount of the third electronic fan group based on the engine coolant temperature and the third temperature threshold, determining the target speed of the third electronic fan group based on the initial speed and the speed adjustment amount, and controlling the third electronic fan group based on the target speed.

[0014] A fan control method provided by the present invention further includes:

[0015] Before the engine is started, controlling the fan system to be turned on for a preset duration;

[0016] Performing a fault detection based on the speed signal feedback by the fan system within the preset duration.

[0017] A fan control method provided by the present invention further includes:

[0018] When the engine is shut down, if the engine coolant temperature is greater than or equal to the fourth temperature threshold, controlling the third electronic fan group to operate.

[0019] The present invention also provides a fan control system, including:

[0020] A fan system; the fan system includes a first electronic fan group, a second electronic fan group, and a third electronic fan group; the first electronic fan group is used to adjust the hydraulic oil temperature; the second electronic fan group is used to adjust the engine intake air temperature; the third electronic fan group is used to adjust the engine coolant temperature;

[0021] A controller; the controller is configured to, when the engine coolant temperature reaches a first temperature threshold and the hydraulic oil temperature is less than a second temperature threshold, control the operation of a first electronic fan group in the fan system based on the hydraulic oil temperature, and control the operation of a second electronic fan group in the fan system based on the engine intake temperature; when the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, control the operation of a third electronic fan group in the fan system based on the engine coolant temperature.

[0022] A fan control system provided by the present invention, a radiator is arranged in the air outlet direction of the fan system, and an intercooler is arranged on one side of the radiator close to or away from the fan system; the radiator includes a coolant radiator and a hydraulic oil radiator; the first electronic fan group corresponds to the hydraulic oil radiator; the second electronic fan group corresponds to the intercooler; the third electronic fan group corresponds to the coolant radiator.

[0023] A fan control system provided by the present invention, a first electronic fan and a second electronic fan are arranged on the windward side of the coolant radiator; a third electronic fan and a fourth electronic fan are arranged on the windward side of the hydraulic oil radiator; a fifth electronic fan and a sixth electronic fan are arranged at adjacent positions on the windward side of the coolant radiator and the hydraulic oil radiator;

[0024] The first electronic fan group includes the third electronic fan and the fourth electronic fan;

[0025] The second electronic fan group includes the first electronic fan and the fifth electronic fan;

[0026] The third electronic fan group includes the second electronic fan and the sixth electronic fan.

[0027] The present invention also provides a vehicle, including any one of the above-mentioned fan control systems.

[0028] The fan control method, fan control system and vehicle provided by the present invention, the electronic fan groups in the fan system are no longer connected to the engine, realizing the decoupling of the fan system and the engine. In this way, three electronic fan groups can be used to more precisely adjust the engine coolant temperature, hydraulic oil temperature and engine intake temperature respectively, thereby improving the thermal management ability of the fan system. Further, by setting a first temperature threshold and a third temperature threshold to segment the engine coolant temperature, and setting a second temperature threshold to segment the hydraulic oil temperature, so as to control the three electronic fan groups respectively, not only realizes the precise adjustment of the engine coolant temperature, but also realizes the pre-adjustment of the hydraulic oil temperature, further improving the thermal management ability of the fan system. Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic flowchart of the fan control method provided by the present invention;

[0031] Figure 2 It is a schematic structural diagram of the cooling system provided by the present invention;

[0032] Figure 3 It is a schematic diagram of the working principle of the electronic fan provided by the present invention;

[0033] Figure 4 It is a schematic flowchart of the PID algorithm provided by the present invention;

[0034] Figure 5 It is a schematic structural diagram of the fan control system provided by the present invention;

[0035] Figure 6 It is a schematic structural diagram of the fan control device provided by the present invention;

[0036] Figure 7 It is a schematic structural diagram of the electronic device provided by the present invention;

[0037] Reference Signs:

[0038] 210: Fan system; 211: First electronic fan; 212: Second electronic fan; 213: Third electronic fan; 214: Fourth electronic fan; 215: Fifth electronic fan; 216: Sixth electronic fan;

[0039] 220: Coolant radiator; 230: Hydraulic oil radiator; 240: Intercooler;

[0040] 250: Controller. Detailed Embodiments

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention fall within the scope of protection of the present invention.

[0042] It should be noted that the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0044] In the related art, when the engine stops running, the engine's coolant circulation system also stops circulating, which causes the temperature of the coolant remaining in the engine body to rise sharply due to the continuous heat dissipation of the engine itself. At this time, the direct-connected fan or electronically controlled silicone oil fan connected to the engine will also stop running accordingly, and it is impossible to cool down the coolant in the engine body in time. Therefore, the thermal management capability of the fan system in the related art is relatively low.

[0045] To this end, the present invention provides a fan control method, which can achieve decoupling of the engine and the fan system, thereby improving the thermal management capability of the fan system. The fan control method of the present invention can be applied to vehicles, where the vehicle can be an ordinary car or an operating machine, for example, the operating machine can be an engineering machine such as a crane, an excavator, a pile driver, or an engineering vehicle such as a aerial platform, a fire truck, a mixer truck, etc.

[0046] The fan control method of the present invention may be executed by a controller. Exemplarily, the controller may be a vehicle control unit (VCU) in a vehicle.

[0047] Combine the following Figures 1 to 5 The fan control method provided by the present invention is described.

[0048] like Figure 1 As shown, an embodiment of the present invention provides a fan control method, which at least includes the following steps:

[0049] Step 110, obtaining the hydraulic oil temperature, the engine coolant temperature and the engine intake air temperature;

[0050] Step 120: When the engine coolant temperature reaches the first temperature threshold and the hydraulic oil temperature is less than the second temperature threshold, control the operation of the first electronic fan group in the fan system based on the hydraulic oil temperature, and control the operation of the second electronic fan group in the fan system based on the engine intake air temperature; the first electronic fan group is used to adjust the hydraulic oil temperature, and the second electronic fan group is used to adjust the engine intake air temperature;

[0051] When the engine coolant temperature reaches the first temperature threshold and is less than or equal to the third temperature threshold, control the operation of the third electronic fan group in the fan system based on the engine coolant temperature, and the third electronic fan group is used to adjust the engine coolant temperature.

[0052] It can be understood that a cooling system is generally provided in a vehicle, and the cooling system may include a fan system.

[0053] In this embodiment, a radiator is provided in the air outlet direction of the fan system, and an intercooler is provided on one side of the radiator close to or away from the fan system; the radiator includes a coolant radiator and a hydraulic oil radiator, and the fan system includes a first electronic fan group corresponding to the hydraulic oil radiator, a second electronic fan group corresponding to the intercooler, and a third electronic fan group corresponding to the coolant radiator.

[0054] As Figure 2 shown, the cooling system may include a fan system 210, a radiator, and an intercooler 240. The radiator includes a coolant radiator 220 and a hydraulic oil radiator 230. Among them, a radiator is provided in the air outlet direction of the fan system ( Figure 2 the arrow direction in

[0055] As Figure 2 shown, the coolant radiator 220 and the hydraulic oil radiator 230 in the radiator are arranged adjacent to each other side by side. The radiator has a first side and a second side along the air outlet direction of the fan system. Among them, the first side of the radiator may be the side of the radiator close to the fan system, and the second side of the radiator may be the side of the radiator away from the fan system. The intercooler may be provided on the first side of the radiator or on the second side of the radiator. Figure 2 In

[0056] shown, the intercooler 240 is located on the second side of the radiator, that is, the side of the radiator away from the fan system.

[0057] Correspondingly, the fan system may include a first electronic fan group, a second electronic fan group, and a third electronic fan group. Among them, the first electronic fan group may correspond to the hydraulic oil radiator and is used to adjust the hydraulic oil temperature. The second electronic fan group may correspond to the intercooler and is used to adjust the engine intake air temperature. The third electronic fan group may correspond to the coolant radiator and is used to adjust the engine coolant temperature.

[0058] Specifically, after the VCU is powered on, it can collect the engine intake air temperature, the engine coolant temperature, and the hydraulic oil temperature in real time, and control the fan system based on the engine intake air temperature, the engine coolant temperature, and the hydraulic oil temperature. In the first electronic fan group, the second electronic fan group, and the third electronic fan group included in the fan system, each electronic fan group may include at least one electronic fan. Each electronic fan in the electronic fan group is driven by a motor. Figure 3 Schematically shows the working principle of the electronic fan. The VCU controls the rotational speed of the motor of the electronic fan by controlling the pulse width modulation (PWM) signal I output to the electronic fan PWM , and the rotational speed of the motor of the electronic fan is the rotational speed of the electronic fan, so as to realize the adjustment of the air volume and the cooling capacity. The duty cycle of the PWM signal is adjustable. In implementation, the corresponding relationship between the rotational speed of the electronic fan and the duty cycle of the PWM can be preset. In addition, the VCU detects faults of the electronic fan by collecting the rotational speed signal I fed back by the electronic fan FO .

[0059] In implementation, the corresponding relationship between the hydraulic oil temperature and the rotational speed of the first electronic fan group, the corresponding relationship between the engine intake air temperature and the rotational speed of the second electronic fan group, and the corresponding relationship between the engine coolant temperature and the rotational speed of the third electronic fan group can be preset.

[0060] Based on this, controlling the operation of the first electronic fan group in the fan system based on the hydraulic oil temperature may include determining the rotational speed of the first electronic fan group based on the corresponding relationship between the hydraulic oil temperature and the rotational speed of the first electronic fan group, and controlling the operation of the first electronic fan group based on the determined rotational speed of the first electronic fan group.

[0061] Based on the engine intake air temperature to control the operation of the second electronic fan group in the fan system may include determining the speed of the second electronic fan group based on the corresponding relationship between the engine intake air temperature and the speed of the second electronic fan group, and controlling the operation of the second electronic fan group based on the determined speed of the second electronic fan group. Among them, in the corresponding relationship between the engine intake air temperature and the speed of the second electronic fan group, when the engine intake air temperature is less than the fifth temperature threshold, the speed corresponding to the engine intake air temperature is zero, and when the engine intake air temperature is greater than or equal to the fifth temperature threshold, the engine intake air temperature and the corresponding speed of the second electronic fan group are linearly related. Among them, the fifth temperature threshold is less than the first temperature threshold. In this way, when the engine intake air temperature is very low, there is no need to cool down, and the speed of the second electronic fan group is determined to be zero, that is, the second electronic fan group stops running.

[0062] Based on the engine coolant temperature to control the operation of the third electronic fan group in the fan system may include: determining the speed of the third electronic fan group based on the corresponding relationship between the engine coolant temperature and the speed of the third electronic fan group, and controlling the operation of the third electronic fan group based on the determined speed of the third electronic fan group.

[0063] Further, in this embodiment, a temperature control strategy of segmented adjustment of the engine coolant temperature is adopted. Specifically, a first temperature threshold and a third temperature threshold related to the engine coolant temperature can be preset in advance. When the engine coolant temperature reaches the first temperature threshold and is less than or equal to the third temperature threshold, the third electronic fan group is controlled to operate at a speed corresponding to the engine coolant temperature. Among them, the first temperature threshold is the temperature at the end of engine warm-up, that is, the engine coolant temperature at the end of engine warm-up.

[0064] In this embodiment, since a radiator is arranged in the air outlet direction of the fan system, the radiator includes a coolant radiator and a hydraulic oil radiator, and an intercooler is arranged on one side of the radiator close to or away from the fan system. The flow fields of the three affect each other and have a high coupling. In the related art, a direct-connected fan or an electronically controlled silicone oil fan is used to cool the three at the same time, and it is impossible to achieve targeted temperature adjustment of the intercooler, the coolant radiator and the hydraulic oil radiator. However, in the fan system of this embodiment, the first electronic fan group corresponding to the hydraulic oil radiator, the second electronic fan group corresponding to the intercooler and the third electronic fan group corresponding to the coolant radiator are set. The three electronic fan groups dissipate heat from the hydraulic oil radiator, the intercooler and the coolant radiator respectively through their respective operations, and then can achieve targeted adjustment of the hydraulic oil temperature, the engine intake air temperature and the engine coolant temperature, solving the problem of high coupling in the control of the hydraulic oil temperature, the engine intake air temperature and the engine coolant temperature in the fan system, and improving the thermal management ability of the fan system; further, the temperature control strategy of segmented adjustment of the engine coolant temperature adopted in this embodiment can further improve the thermal management ability of the fan system.

[0065] In practical applications, hydraulic oil is a work transmission medium. The hydraulic oil temperature has a great relationship with the operating efficiency, energy loss, etc. in vehicles, especially construction machinery. Therefore, it is crucial to ensure a reasonable hydraulic oil temperature for the overall heat dissipation of the vehicle. Since the intercooler, the coolant radiator and the hydraulic oil radiator are generally integrated together according to the positional relationship, the flow fields of the three affect each other and have a high coupling. In view of such a high coupling situation, in order to better adjust the hydraulic oil temperature, in this embodiment, the coupling between the flow field of the intercooler and the flow field of the hydraulic oil radiator is utilized to control the first electronic fan group and the second electronic fan group to adjust the hydraulic oil temperature at the same time. The first electronic fan group can assist in adjusting the hydraulic oil temperature, thereby improving the hydraulic oil temperature adjustment efficiency.

[0066] Since the first temperature threshold is the engine coolant temperature at the end of engine warm-up, when the engine reaches the first temperature threshold during the start-up process, it indicates that the engine warm-up is over, and then the engine starts to enter the working state. When the engine coolant temperature reaches the first temperature threshold, that is, when the warm-up is over, and the hydraulic oil temperature is still low, that is, when the hydraulic oil temperature is less than the second temperature threshold, the first electronic fan group and the second electronic fan group can be controlled to operate, so as to cool down the hydraulic oil in advance and avoid the too fast rise of the hydraulic oil temperature.

[0067] In this embodiment, the electric fan group in the fan system is no longer connected to the engine, realizing the decoupling of the fan system and the engine. In this way, three electric fan groups can be used to more precisely adjust the engine coolant temperature, hydraulic oil temperature, and engine intake air temperature respectively, thereby improving the thermal management ability of the fan system. Further, by setting a first temperature threshold and a third temperature threshold to segment the engine coolant temperature, and setting a second temperature threshold to segment the hydraulic oil temperature, the three electric fan groups are controlled respectively, which not only realizes the precise adjustment of the engine coolant temperature, but also realizes the pre-adjustment of the hydraulic oil temperature, further improving the thermal management ability of the fan system.

[0068] In an exemplary embodiment, when the hydraulic oil temperature is greater than or equal to the second temperature threshold, increase the rotational speed of the first electric fan group and the rotational speed of the second electric fan group.

[0069] As the engine runs, the hydraulic oil temperature gradually rises. When the hydraulic oil temperature is greater than or equal to the second temperature threshold, the rotational speed of the first electric fan group and the rotational speed of the second electric fan group can be increased, thereby accelerating the cooling of the hydraulic oil.

[0070] Exemplarily, increasing the rotational speed of the first electric fan group and the rotational speed of the second electric fan group may specifically include: controlling the rotational speed of the first electric fan group to reach the maximum rotational speed, and at the same time controlling the rotational speed of the first electric fan group to reach the maximum rotational speed. In this way, the timely cooling of the hydraulic oil can be ensured to the greatest extent.

[0071] In implementation, the second temperature threshold related to the hydraulic oil temperature can be preset according to the actual situation. Exemplarily, the second temperature threshold can be 90°C. In this way, the hydraulic oil temperature can be ensured to be reasonable.

[0072] In an exemplary embodiment, when the engine starts, in the case where the engine coolant temperature is less than the first temperature threshold, control the first electric fan group and the third electric fan group to stop. And control the second electric fan group to operate based on the engine intake air temperature.

[0073] Specifically, after the VCU receives the engine start signal, it controls the engine to start. In order to protect the engine, it is necessary to warm up the engine during the engine start process. Since the first temperature threshold is the engine coolant temperature at the end of the engine warm-up, when the engine coolant temperature reaches the first temperature threshold, it indicates that the engine warm-up is over. Exemplarily, the first temperature threshold can be 75°C.

[0074] It should be noted that during the engine warm-up process, when the engine intake air temperature is very low, there is no need to cool down, and the determined rotational speed of the second electric fan group is zero, that is, the second electric fan group stops running.

[0075] During the engine warm-up process, since the coolant is still in the small-circulation heat dissipation mode, to ensure the warm-up efficiency, the third electronic fan group corresponding to the coolant radiator and the first electronic fan group corresponding to the hydraulic oil radiator are controlled to stop. In this way, it is possible to ensure that the engine coolant temperature and the hydraulic oil temperature are increased as soon as possible, thereby achieving the engine warm-up effect and protecting the engine.

[0076] In an exemplary embodiment, when the engine coolant temperature is greater than the third temperature threshold, the initial speed of the third electronic fan group corresponding to the engine coolant temperature is determined based on the correspondence between the engine coolant temperature and the speed of the third electronic fan group. Based on the engine coolant temperature and the third temperature threshold, the speed adjustment amount of the third electronic fan group is determined. Based on the initial speed and the speed adjustment amount, the target speed of the third electronic fan group is determined, and the third electronic fan group is controlled based on the target speed. Among them, the proportional integral derivative (PID) algorithm can be used to determine the speed adjustment amount of the third electronic fan group.

[0077] Among them, the target speed is used to make the engine coolant temperature reach the third temperature threshold.

[0078] In practical applications, during the normal operation of the engine, the engine coolant temperature can be controlled near an ideal coolant temperature, and this ideal coolant temperature is the target coolant temperature. Thus, controlling the engine coolant temperature near the target coolant temperature can not only reduce the heat dissipation of the engine, but also improve the performance of the engine lubrication system, reduce the internal friction of the engine, and reduce the fuel consumption of the engine.

[0079] The above-mentioned third temperature threshold can be the target coolant temperature. In order to keep the engine coolant temperature near the third temperature threshold, the temperature control strategy for segmented adjustment of the engine coolant temperature can also introduce the PID algorithm for the case where the engine coolant temperature is greater than the third temperature threshold. Through this PID algorithm, the target speed corresponding to the third temperature threshold can be determined, and the target speed is used to keep the engine coolant temperature near the third temperature threshold.

[0080] Exemplarily, the engine coolant temperature is T w , the third temperature threshold is T3, and when T w > T3, as Figure 4 shown, if the current engine coolant temperature collected by the VCU is T w0 , then based on the correspondence between the engine coolant temperature T w and the speed N w of the third electronic fan group, Tw0 The initial rotational speed N of the corresponding third electronic fan group w0 , and at the same time, input the current engine coolant temperature T w0 and the target coolant temperature T w3 into the PID controller. The PID controller uses the PID algorithm to obtain the rotational speed adjustment amount N wpid , and output N wpid . The output rotational speed adjustment amount N wpid and the initial rotational speed N w0 are superimposed to form the target rotational speed N w3 . The third electronic fan group corresponding to the coolant radiator operates at the target rotational speed N w3 . Among them, the target rotational speed N w3 can keep the engine coolant temperature T w maintained near the third temperature threshold T3.

[0081] Exemplarily, the value range of the third temperature threshold is 85 - 95 °C. For example, the third temperature threshold can be 90 °C.

[0082] In this embodiment, the target coolant temperature of the engine coolant temperature is set as the third temperature threshold. The rotational speed adjustment amount of the third electronic fan group is obtained by using the PID algorithm. The rotational speed adjustment amount and the initial rotational speed are superimposed to obtain the target rotational speed of the third electronic fan group. This target rotational speed can keep the engine coolant temperature maintained near the third temperature threshold. In this way, not only can the heat dissipation of the engine be reduced, but also the performance of the engine lubrication system can be improved, the internal friction of the engine can be reduced, the fuel consumption of the engine can be reduced, and the reliability of the fan system thermal management can be ensured.

[0083] In an exemplary embodiment, the fan control method may further include:

[0084] After the vehicle is powered on and before the engine is started, control the fan system to turn on for a preset duration;

[0085] Based on the rotational speed signal feedback by the fan system within the preset duration, perform a fault detection.

[0086] Specifically, after the vehicle is powered on, the vehicle control unit VCU is also powered on, and the fan system enters the initialization state.

[0087] Specifically, performing a fault detection based on the rotational speed signal feedback by the fan system within the preset duration includes, within the preset duration, outputting a PWM signal to the fan system to control the motor of the fan system, and the fan system feeds back the rotational speed signal generated by the motor for the fault self-check of the fan system.

[0088] As Figure 3 shown, in one embodiment, the VCU outputs I to the motor of each electronic fan in the fan systemPWM The motor speed of the electric fan is controlled to be the first speed, and the VCU collects the speed signal I fed back by the motor. FO The VCU can utilize I FO to perform fault detection on each electric fan in the fan system. If the speed of each electric fan is within the preset reasonable speed range, it can be considered that the fan system has no fault. After determining that the fan system has no fault, the VCU adjusts the duty cycle of the PWM to 0, and all electric fans stop running; if the speed of any one electric fan exceeds the preset reasonable speed range, it can be considered that the fan system has a fault, and the VCU issues a signal to prohibit starting the engine.

[0089] Exemplarily, the first speed can be 400 revolutions per minute (r / min). The preset duration ranges from 2 to 5 seconds. The preset reasonable speed can be N0 ± 100 r / min, where N0 is the first speed.

[0090] In this embodiment, by performing fault detection on the fan system before starting the engine, the health status of the fan system can be quickly and effectively judged, ensuring the safe operation of the fan system.

[0091] In an exemplary embodiment, the fan control method may further include:

[0092] When the vehicle is powered on and the engine is stopped, if the engine coolant temperature is greater than or equal to the fourth temperature threshold, control the third electric fan group to operate.

[0093] Specifically, the situation where the vehicle is powered on and the engine is stopped can be that the vehicle, especially the working machine, has been running at high load for a long time and then the engine stops, but the VCU is still in the working mode. When the engine stops but the VCU is still in the working mode, the engine stop will cause the corresponding pump in the coolant circulation system to stop running. As part of the coolant circulation system, the engine cannot use the coolant system circulation for cooling after stopping. However, the engine is still dissipating heat externally just after it stops. Therefore, the coolant temperature of the engine body will rise rapidly. Since there is a coolant temperature sensor on the engine body, the coolant temperature sensor will feedback the coolant temperature of the engine body to the VCU. However, at this time, the coolant temperature feedback by the coolant temperature sensor is the coolant temperature of the engine body, not the coolant temperature of the entire coolant circulation system. Therefore, the VCU is likely to generate false alarms, and if the engine is still dissipating heat externally after stopping, it is likely to damage the engine body.

[0094] To prevent the above situation from occurring, when the vehicle is powered on and the engine is stopped, the VCU controls the operation of the third electronic fan group by comparing the engine coolant temperature with the fourth temperature threshold. If the engine coolant temperature is greater than or equal to the fourth temperature threshold, the VCU controls the third electronic fan group to operate at the speed corresponding to the engine coolant temperature of the third electronic fan group. During the operation, when the VCU detects that the engine coolant temperature is less than the first temperature threshold, it controls the third electronic fan group to stop operating, achieving engine shutdown protection. In implementation, the fourth temperature threshold related to the engine coolant temperature can be preset. Exemplarily, the fourth temperature threshold can be 90 °C.

[0095] In a specific embodiment, the VCU controls the third electronic fan group to operate at the speed corresponding to the engine coolant temperature of the third electronic fan group can be to control the speed of the third electronic fan group to reach the maximum speed to ensure that the engine block coolant temperature drops rapidly.

[0096] In this embodiment, when the vehicle is powered on and the engine is stopped, if the engine coolant temperature is greater than or equal to the fourth temperature threshold, controlling the operation of the third electronic fan group can cool the engine block in time, that is, by avoiding excessive local temperature accumulation in the engine to damage the engine, which is beneficial to protecting the engine and can also avoid false fault alarms in the VCU system.

[0097] In the above temperature control strategy for segmented adjustment of the engine coolant temperature, among the first temperature threshold, the third temperature threshold, and the fourth temperature threshold related to the engine coolant temperature, the first temperature threshold is less than the third temperature threshold and the fourth temperature threshold.

[0098] When the vehicle is in the engine warm-up stage, at this time the engine coolant temperature is less than the first temperature threshold, the VCU controls the second electronic fan group to stop operating or operate at the lowest speed based on the engine intake air temperature, and controls the first electronic fan group and the third electronic fan group to stop. This can ensure that the engine coolant temperature and the hydraulic oil temperature are increased as soon as possible to achieve the engine warm-up effect and protect the engine.

[0099] When the engine warm-up is completed and the engine starts to operate normally, the engine coolant temperature begins to rise. At this time, the engine coolant temperature is greater than the first temperature threshold.

[0100] When the engine coolant temperature reaches the first temperature threshold, if the engine coolant temperature is greater than the first temperature threshold and less than or equal to the third temperature threshold, the VCU controls the third electronic fan group to operate based on the engine coolant temperature. In this way, it can prevent the coolant temperature from rising too fast.

[0101] When the engine coolant temperature reaches the first temperature threshold, when the hydraulic oil temperature is less than the second temperature threshold, control the operation of the first electronic fan group based on the hydraulic oil temperature, and control the operation of the second electronic fan group based on the engine intake air temperature. When the hydraulic oil temperature is greater than or equal to the second temperature threshold, increase the rotation speed of the first electronic fan group and the second electronic fan group.

[0102] When the engine coolant temperature is greater than the third temperature threshold, introduce the PID algorithm. Determine the initial rotation speed of the third electronic fan group corresponding to the engine coolant temperature based on the correspondence between the engine coolant temperature and the rotation speed of the third electronic fan group. Based on the engine coolant temperature and the third temperature threshold, use the PID algorithm to determine the rotation speed adjustment amount of the third electronic fan group. Determine the target rotation speed of the third electronic fan group based on the initial rotation speed and the rotation speed adjustment amount. In this way, by controlling the third electronic fan group to operate at the target rotation speed, the VCU can keep the engine coolant temperature near the third temperature threshold, thereby reducing the heat dissipation of the engine, improving the performance of the engine lubrication system, reducing the internal friction of the engine, and reducing the fuel consumption of the engine.

[0103] When the engine stops but the VCU is still in the working mode, if the engine coolant temperature is greater than or equal to the fourth temperature threshold, control the operation of the third electronic fan group. During the operation, when the VCU detects that the engine coolant temperature is less than the first temperature threshold, control the third electronic fan group to stop operating. In this way, by avoiding the excessive local temperature accumulation of the engine from damaging the engine, it is beneficial to protect the engine, and at the same time, it can also avoid incorrect fault alarms of the VCU system.

[0104] The fan control system provided by the present invention will be described below. The fan control system described below can be mutually corresponding and referred to with the fan control method described above.

[0105] As Figure 2 and Figure 5 shown, an embodiment of the present invention further provides a fan control system, including:

[0106] A fan system 210; the fan system 210 includes a first electronic fan group, a second electronic fan group, and a third electronic fan group; the first electronic fan group is used to adjust the hydraulic oil temperature; the second electronic fan group is used to adjust the engine intake air temperature; the third electronic fan group is used to adjust the engine coolant temperature.

[0107] Controller 250; the controller 250 is configured to, when the engine coolant temperature reaches a first temperature threshold and the hydraulic oil temperature is less than a second temperature threshold, control the operation of the first electronic fan group in the fan system based on the hydraulic oil temperature, and control the operation of the second electronic fan group in the fan system based on the engine intake air temperature; when the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, control the operation of the third electronic fan group in the fan system based on the engine coolant temperature.

[0108] In an exemplary embodiment, as Figure 2 shown, a radiator is disposed in the air outlet direction of the fan system 210, and an intercooler 240 is disposed on one side of the radiator close to or away from the fan system 210; the radiator includes a coolant radiator 220 and a hydraulic oil radiator 230; the first electronic fan group corresponds to the hydraulic oil radiator 230; the second electronic fan group corresponds to the intercooler 240; the third electronic fan group corresponds to the coolant radiator 220.

[0109] In an exemplary embodiment, as Figure 2 shown, a first electronic fan 211 and a second electronic fan 212 are disposed on the windward side of the coolant radiator 220; a third electronic fan 213 and a fourth electronic fan 214 are disposed on the windward side of the hydraulic oil radiator 230; a fifth electronic fan 215 and a sixth electronic fan 216 are disposed at adjacent positions on the windward side of the coolant radiator 220 and the hydraulic oil radiator 230;

[0110] The first electronic fan group includes the third electronic fan 213 and the fourth electronic fan 214, and the third electronic fan 213 and the fourth electronic fan 214 correspond to the hydraulic oil radiator 230;

[0111] The second electronic fan group includes the first electronic fan 211 and the fifth electronic fan 215, and the second electronic fan 211 and the fifth electronic fan 215 correspond to the intercooler 240;

[0112] The third electronic fan group includes the second electronic fan 212 and the sixth electronic fan 216, and the second electronic fan 212 and the sixth electronic fan 216 correspond to the coolant radiator 220;

[0113] Wherein, the first electronic fan 211, the second electronic fan 212, the third electronic fan 213, the fourth electronic fan 214, the fifth electronic fan 215 and the sixth electronic fan 216 are separated by partitions.

[0114] In this embodiment, three electronic fan groups are provided in the fan system, and each electronic fan group includes two electronic fans. Among them, the first electronic fan 211 and the fifth electronic fan 215 correspond to the intercooler 240, the second electronic fan 212 and the sixth electronic fan 216 correspond to the coolant radiator 220, and the third electronic fan 213 and the fourth electronic fan 214 correspond to the hydraulic oil radiator 230. In this way, the VCU can independently control the intercooler 240, the coolant radiator 220, and the hydraulic oil radiator 230 through the three electronic fan groups respectively, and then can targetedly adjust the engine intake air temperature, the engine coolant temperature, and the hydraulic oil temperature, solving the problem of high coupling in the control of the engine intake air temperature, the engine coolant temperature, and the hydraulic oil temperature in the fan system, and improving the thermal management ability of the fan system.

[0115] In addition, as Figure 2 shown, when the first electronic fan group operates, since the third electronic fan 213 in the first electronic fan group also corresponds to the position of the intercooler 240, it can assist in dissipating heat from the intercooler 240 while mainly dissipating heat from the hydraulic oil radiator 230; when the second electronic fan group operates, since the fifth electronic fan 215 in the second electronic fan group also corresponds to the position adjacent to the coolant radiator 220 and the hydraulic oil radiator 230, it can assist in dissipating heat from the coolant radiator 220 and the hydraulic oil radiator 230 while mainly dissipating heat from the intercooler 240; when the third electronic fan group operates, since the sixth electronic fan 216 in the third electronic fan group also corresponds to the position adjacent to the coolant radiator 220 and the hydraulic oil radiator 230, it can assist in dissipating heat from the hydraulic oil radiator 230 while mainly dissipating heat from the coolant radiator 220. In this way, the thermal management ability of the fan system is further improved. In this way, the coolant temperature, the hydraulic oil temperature, and the engine intake air temperature can all reach the optimal temperature, reducing the energy consumption of the vehicle and improving the working efficiency.

[0116] The fan control device provided by the present invention will be described below, and the fan control device described below can be mutually referred to the fan control method described above.

[0117] As Figure 6 shown, an embodiment of the present invention further provides a fan control device, including:

[0118] A temperature acquisition module 610, configured to acquire the hydraulic oil temperature, the engine coolant temperature, and the engine intake air temperature;

[0119] The fan control module 620 is configured to, when the engine coolant temperature reaches a first temperature threshold and the hydraulic oil temperature is less than a second temperature threshold, control the operation of a first electronic fan group in the fan system based on the hydraulic oil temperature, and control the operation of a second electronic fan group in the fan system based on the engine intake air temperature; the first electronic fan group is used to adjust the hydraulic oil temperature, and the second electronic fan group is used to adjust the engine intake air temperature; it is also configured to, when the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, control the operation of a third electronic fan group in the fan system based on the engine coolant temperature; the third electronic fan group is used to adjust the engine coolant temperature.

[0120] In an exemplary embodiment, the fan control module 620 is further configured to:

[0121] When the hydraulic oil temperature is greater than or equal to the second temperature threshold, increase the rotational speed of the first electronic fan group and the rotational speed of the second electronic fan group.

[0122] In an exemplary embodiment, the fan control module 620 is further configured to:

[0123] When the engine starts and the engine coolant temperature is less than the first temperature threshold, control the first electronic fan group and the third electronic fan group to stop, and control the operation of the second electronic fan group based on the engine intake air temperature, where the first temperature threshold is the temperature of the engine coolant at the end of engine warm-up.

[0124] In an exemplary embodiment, the fan control module 620 is further configured to:

[0125] When the engine coolant temperature is greater than the third temperature threshold, determine the initial rotational speed of the third electronic fan group corresponding to the engine coolant temperature based on the correspondence between the engine coolant temperature and the rotational speed of the third electronic fan group, determine the rotational speed adjustment amount of the third electronic fan group based on the engine coolant temperature and the third temperature threshold, determine the target rotational speed of the third electronic fan group based on the initial rotational speed and the rotational speed adjustment amount, and control the third electronic fan group based on the target rotational speed.

[0126] In an exemplary embodiment, the fan control module 620 is further configured to: after the vehicle is powered on and before the engine starts, control the fan system to turn on for a preset duration; perform a fault detection based on the rotational speed signal feedback by the fan system within the preset duration.

[0127] In an exemplary embodiment, the fan control module 620 is further configured to:

[0128] When the vehicle is powered on and the engine is stopped, if the engine coolant temperature is greater than or equal to a fourth temperature threshold, control the third electronic fan group to operate.

[0129] Figure 7 An exemplary structural diagram of an electronic device is shown as Figure 7 shown. The electronic device may include: a processor 710, a communications interface 720, a memory 730, and a communication bus 740. Among them, the processor 710, the communications interface 720, and the memory 730 communicate with each other via the communication bus 740. The processor 710 may invoke the logical instructions in the memory 730 to execute the fan control method provided in any of the above embodiments. The fan control method includes:

[0130] Obtain the hydraulic oil temperature, the engine coolant temperature, and the engine intake air temperature;

[0131] When the engine coolant temperature reaches a first temperature threshold and the hydraulic oil temperature is less than a second temperature threshold, based on the hydraulic oil temperature, control the operation of the first electronic fan group in the fan system, and based on the engine intake air temperature, control the operation of the second electronic fan group in the fan system; the first electronic fan group is used to adjust the hydraulic oil temperature, and the second electronic fan group is used to adjust the engine intake air temperature;

[0132] When the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, based on the engine coolant temperature, control the operation of the third electronic fan group in the fan system, and the third electronic fan group is used to adjust the engine coolant temperature.

[0133] In addition, when the logical instructions in the above-mentioned memory 730 are implemented in the form of software functional units and sold or used as an independent product, they may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, may be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0134] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer is capable of executing the fan control method provided in any of the above embodiments. The fan control method includes:

[0135] Obtain the hydraulic oil temperature, the engine coolant temperature, and the engine intake air temperature;

[0136] When the engine coolant temperature reaches a first temperature threshold and the hydraulic oil temperature is less than a second temperature threshold, control the operation of a first electronic fan group in the fan system based on the hydraulic oil temperature, and control the operation of a second electronic fan group in the fan system based on the engine intake air temperature; the first electronic fan group is used to adjust the hydraulic oil temperature, and the second electronic fan group is used to adjust the engine intake air temperature;

[0137] When the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, control the operation of a third electronic fan group in the fan system based on the engine coolant temperature, and the third electronic fan group is used to adjust the engine coolant temperature.

[0138] On another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the fan control method provided in any of the above embodiments. The fan control method includes:

[0139] Obtain the hydraulic oil temperature, the engine coolant temperature, and the engine intake air temperature;

[0140] When the engine coolant temperature reaches a first temperature threshold and the hydraulic oil temperature is less than a second temperature threshold, control the operation of a first electronic fan group in the fan system based on the hydraulic oil temperature, and control the operation of a second electronic fan group in the fan system based on the engine intake air temperature; the first electronic fan group is used to adjust the hydraulic oil temperature, and the second electronic fan group is used to adjust the engine intake air temperature;

[0141] When the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, control the operation of a third electronic fan group in the fan system based on the engine coolant temperature, and the third electronic fan group is used to adjust the engine coolant temperature.

[0142] An embodiment of the present invention also provides a vehicle, which is used to execute the fan control method provided in any of the above embodiments, or includes the fan control system provided in any of the above embodiments, or includes the fan control device provided in any of the above embodiments, or includes the electronic device provided in any of the above embodiments, or includes the non-transitory computer-readable storage medium provided in any of the above embodiments, or includes the computer program product provided in any of the above embodiments.

[0143] Exemplarily, the vehicle can be an ordinary automobile or a working machine. For example, the working machine can be construction machinery such as a crane, an excavator, a pile driver, etc., or an engineering vehicle such as an aerial work platform, a fire truck, a mixer truck, etc.

[0144] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. A fan control method, characterized in that, Including: Obtaining the hydraulic oil temperature, the engine coolant temperature, and the engine intake air temperature; When the engine coolant temperature reaches a first temperature threshold, and when the hydraulic oil temperature is less than a second temperature threshold, controlling the operation of a first electronic fan group in the fan system based on the hydraulic oil temperature, and controlling the operation of a second electronic fan group in the fan system based on the engine intake air temperature; the first electronic fan group is used to adjust the hydraulic oil temperature, and the second electronic fan group is used to adjust the engine intake air temperature; When the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, controlling the operation of a third electronic fan group in the fan system based on the engine coolant temperature, and the third electronic fan group is used to adjust the engine coolant temperature; The first temperature threshold is the temperature when the engine warm-up is completed; when the engine starts, when the engine coolant temperature is less than the first temperature threshold, controlling the first electronic fan group and the third electronic fan group to stop; When the engine coolant temperature is greater than the third temperature threshold, determining the initial speed of the third electronic fan group corresponding to the engine coolant temperature based on the correspondence between the engine coolant temperature and the speed of the third electronic fan group, determining the speed adjustment amount of the third electronic fan group based on the engine coolant temperature and the third temperature threshold, determining the target speed of the third electronic fan group based on the initial speed and the speed adjustment amount, and controlling the third electronic fan group based on the target speed.

2. The fan control method according to claim 1, wherein Further including: When the hydraulic oil temperature is greater than or equal to the second temperature threshold, increasing the speed of the first electronic fan group and the speed of the second electronic fan group.

3. The fan control method according to any one of claims 1 to 2, characterized in that, Further including: Before the engine starts, controlling the fan system to turn on for a preset duration; Performing a fault detection based on the speed signal feedback by the fan system within the preset duration.

4. The fan control method according to any one of claims 1 to 2, characterized in that, Further including: When the engine is shut down, if the engine coolant temperature is greater than or equal to a fourth temperature threshold, controlling the third electronic fan group to operate.

5. A fan control system, characterized in that, Including: A fan system; the fan system includes a first electronic fan group, a second electronic fan group, and a third electronic fan group; The first electronic fan group is used to adjust the hydraulic oil temperature; The second electronic fan group is used to adjust the engine intake air temperature; the third electronic fan group is used to adjust the engine coolant temperature; A controller; the controller is used to, when the engine coolant temperature reaches a first temperature threshold, and when the hydraulic oil temperature is less than a second temperature threshold, control the operation of the first electronic fan group in the fan system based on the hydraulic oil temperature, and control the operation of the second electronic fan group in the fan system based on the engine intake air temperature; when the engine coolant temperature reaches the first temperature threshold and is less than or equal to a third temperature threshold, control the operation of the third electronic fan group in the fan system based on the engine coolant temperature; A radiator is provided in the air outlet direction of the fan system, and an intercooler is provided on one side of the radiator close to or away from the fan system; the radiator includes a coolant radiator and a hydraulic oil radiator; the first electronic fan group corresponds to the hydraulic oil radiator; the second electronic fan group corresponds to the intercooler; the third electronic fan group corresponds to the coolant radiator; A first electronic fan and a second electronic fan are provided on the windward side of the coolant radiator; a third electronic fan and a fourth electronic fan are provided on the windward side of the hydraulic oil radiator; a fifth electronic fan and a sixth electronic fan are provided at adjacent positions on the windward side of the coolant radiator and the hydraulic oil radiator; The first electronic fan group includes the third electronic fan and the fourth electronic fan; The second electronic fan group includes the first electronic fan and the fifth electronic fan; The third electronic fan group includes the second electronic fan and the sixth electronic fan.

6. A vehicle, characterized in that, It includes the fan control system as described in Claim 5.

Images