Control system, cooling control method thereof and vehicle

Abstract

The invention relates to the technical field of control system cooling, in particular to a control system, a cooling control method thereof and a vehicle, and aims to solve the problem that energy consumption is large in the cooling process of an existing central computing unit. In order to achieve the purpose, the cooling control method comprises the following steps that the working mode of a control system, the junction temperature of the control system and the external environment temperature are obtained; determining a flow strategy of the cooling liquid according to the working mode, the junction temperature and the external environment temperature; namely, the flow of the cooling liquid is finely controlled, so that the external environment temperature participates in the determination of the flow strategy, and the flow control of the cooling liquid is more refined. The water pump does not need to continuously operate according to high load, so that energy consumption is reduced; the service life of the water pump is prolonged; and meanwhile, the flow is controlled by comparing the difference value between the whole vehicle environment temperature and the inlet cooling liquid temperature, and condensation corrosion failure caused by too low internal temperature of the control system is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of control system cooling, and specifically provides a control system and a cooling control method thereof, and a vehicle. Background Art

[0002] At present, with the development of autonomous driving and assisted driving technology, the controller integration of smart electric vehicles is getting higher and higher. As a representative of high integration, the central computing unit has core functions such as intelligent driving, intelligent cockpit, vehicle control, and intelligent gateway. It has the characteristics of high computing power and high heat generation, and a robust thermal management system is required to dissipate heat for the central computing unit. The existing heat dissipation method is to pass coolant to dissipate heat to the central computing unit, and determine the flow rate of coolant according to the temperature of each functional domain of the central computing unit, that is, each chip. However, this rough control method cannot be finely controlled, and requires the water pump to run at high load frequently, which will cause large energy consumption. Moreover, each functional domain of the central computing unit (ADF / CDF / VDF / SAF / Baseboard, etc.) has different working modes (normal mode / guard mode / FOTA mode, etc.), and different working modes have different requirements for coolant flow; if it is also controlled according to the flow rate of the normal mode, the water pump will run at high load, resulting in large energy consumption. If a rough control method is used in electric vehicles, the battery power will be consumed faster and the vehicle's cruising range will be reduced.

[0003] Therefore, the art is in urgent need of a control system and a cooling control method thereof, and a vehicle to solve the above-mentioned technical problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem of high energy consumption in the cooling process of the existing central computing unit.

[0005] In a first aspect, the present invention provides a cooling control method for a control system, the cooling control method comprising the following steps:

[0006] Acquiring the working mode of the control system, the junction temperature of the control system and the external environment temperature;

[0007] A flow strategy of the coolant is determined according to the working mode, the junction temperature and the external environment temperature.

[0008] In a specific implementation of the cooling control method of the control system, the control system includes a plurality of functional chips, the working mode includes a guard mode, and in the guard mode;

[0009] When the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0010] When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective first preset temperature, the flow rate of the cooling liquid is controlled to be the first preset flow rate.

[0011] In a specific implementation of the cooling control method of the control system, the control system includes a plurality of functional chips, the working mode includes a guard mode, and in the guard mode;

[0012] When the flow rate of the cooling liquid is zero and the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0013] When the flow rate of the cooling liquid is zero and at least one of the junction temperatures of the plurality of functional chips is not lower than the respective first preset temperature, the flow rate of the cooling liquid is controlled to be the first preset flow rate;

[0014] When the flow rate of the cooling liquid is the first preset flow rate and the junction temperatures of the plurality of functional chips are all lower than their respective second preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0015] The second preset temperature of each of the plurality of functional chips is lower than the first preset temperature of each of the functional chips.

[0016] In a specific implementation of the cooling control method of the control system, the second preset temperature of each of the plurality of functional chips is greater than 94% of the first preset temperature of each of the plurality of functional chips.

[0017] In a specific implementation of the cooling control method of the above control system, the control system includes a plurality of functional chips, the working mode is a FOTA mode, and in the FOTA mode;

[0018] When the junction temperatures of the plurality of functional chips are all lower than their respective third preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0019] When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective third preset temperature and not higher than the respective fourth preset temperature, the flow rate of the cooling liquid is controlled to be the second preset flow rate;

[0020] wherein the third preset temperature of each of the plurality of functional chips is lower than the fourth preset temperature;

[0021] When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective fourth preset temperature, the flow rate of the cooling liquid is controlled to be the third preset flow rate;

[0022] The third preset flow rate is greater than the second preset flow rate.

[0023] In a specific implementation of the cooling control method of the control system, the control system includes a plurality of functional chips, the working mode includes a communication failure mode, and in the communication failure mode, the required coolant flow rate is a fifth preset flow rate;

[0024] The higher the inlet coolant temperature is, the greater the fifth preset flow rate is.

[0025] In a specific implementation of the cooling control method of the control system, the control system includes a plurality of functional chips, the working mode includes a normal working mode, and in the normal working mode;

[0026] When the inlet coolant temperature is lower than the external environment temperature, the flow rate of the coolant is controlled to be the fifteenth preset flow rate.

[0027] In a specific implementation of the cooling control method of the above control system, in a normal working mode;

[0028] When the inlet coolant temperature is not less than the external environment temperature, the flow rate of the coolant is controlled to request the flow rate according to the mass production flow rate strategy.

[0029] In a specific implementation of the cooling control method of the above control system, the mass production flow strategy includes:

[0030] When the junction temperatures of the plurality of functional chips are all lower than their respective sixth preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0031] When at least one of the junction temperatures of the plurality of functional chips is greater than the respective sixth preset temperature, the flow rate of the cooling liquid is controlled to be a fourth preset flow rate;

[0032] The junction temperature greater than the sixth preset temperature is divided into a plurality of temperature intervals, and as the temperature interval increases, the fourth preset flow rate gradually increases.

[0033] In a specific implementation of the cooling control method of the control system, the junction temperature greater than the sixth preset temperature is divided into at least five temperature intervals; or

[0034] The junction temperature greater than the sixth preset temperature is divided into eight temperature intervals.

[0035] In a specific implementation of the cooling control method of the above control system, within the same temperature range, the higher the inlet coolant temperature is, the greater the fourth preset flow rate is.

[0036] In a specific implementation of the cooling control method of the control system, when the junction temperature of at least one of the plurality of functional chips is not lower than the respective vehicle machine alarm temperature, an alarm is issued;

[0037] The vehicle machine alarm temperature of each of the plurality of functional chips is greater than the first preset temperature.

[0038] In a specific implementation of the cooling control method of the control system, when at least one of the junction temperatures of the plurality of functional chips is not lower than the respective overheat protection temperature, overheat protection is performed;

[0039] The overheat protection temperature of each of the plurality of functional chips is greater than the respective vehicle computer alarm temperature.

[0040] In a specific implementation of the cooling control method of the control system, the control system includes an ADF chip and a SAF chip, and when the junction temperatures of the ADF chip and the SAF chip are higher than their respective frequency reduction temperatures, the corresponding chips are controlled to operate at reduced frequencies.

[0041] In a second aspect, the present invention provides a control system, which adopts the cooling control method of the control system as described above.

[0042] In a third aspect, the present invention provides a vehicle comprising a vehicle body and a control system as described above.

[0043] In the case of adopting the above technical solution, the cooling control method of the present invention includes: obtaining the working mode of the control system, the junction temperature of the control system, and the external ambient temperature; determining the flow strategy of the coolant according to the working mode, junction temperature, and external ambient temperature; that is, finely controlling the flow of the coolant, so that the external ambient temperature participates in the determination of the flow strategy, and makes the flow control of the coolant more refined. The water pump does not have to run continuously at high load, saving energy consumption; and also increasing the service life of the water pump; at the same time, the flow is controlled by comparing the difference between the ambient temperature of the whole vehicle and the temperature of the imported coolant, so as to avoid the internal temperature of the control system being too low, resulting in condensation corrosion failure inside.

[0044] In addition, the working modes are divided into guard mode, FOTA mode and normal working mode, and each mode is divided into multiple temperature ranges to make the flow control of the coolant more refined, which can not only meet the cooling needs of the control system, but also enable the water pump to always run according to the required load instead of always running at high load, saving the energy consumption of the water pump; at the same time, it can be used in electric vehicles to increase the vehicle's cruising range.

[0045] In addition, in normal working mode, when the inlet coolant temperature is lower than the external ambient temperature, condensation may occur due to a large flow rate. Requesting a flow rate according to the fourth preset flow rate, where the value of the fourth preset flow rate is smaller, that is, limiting the flow rate, can avoid condensation in the coolant flow path, thereby avoiding condensation corrosion failure inside the control system.

[0046] Solution 1. A cooling control method for a control system, characterized in that it comprises the following steps:

[0047] Acquiring the working mode of the control system, the junction temperature of the control system and the external environment temperature;

[0048] A flow strategy of the coolant is determined according to the working mode, the junction temperature and the external environment temperature.

[0049] Solution 2. The cooling control method according to Solution 1 is characterized in that the control system includes a plurality of functional chips, the working mode includes a guard mode, and in the guard mode;

[0050] When the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0051] When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective first preset temperature, the flow rate of the cooling liquid is controlled to be the first preset flow rate.

[0052] Solution 3. The cooling control method according to Solution 1 is characterized in that the control system includes a plurality of functional chips, the working mode includes a guard mode, and in the guard mode;

[0053] When the flow rate of the cooling liquid is zero and the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0054] When the flow rate of the cooling liquid is zero and at least one of the junction temperatures of the plurality of functional chips is not lower than the respective first preset temperature, the flow rate of the cooling liquid is controlled to be the first preset flow rate;

[0055] When the flow rate of the cooling liquid is the first preset flow rate and the junction temperatures of the plurality of functional chips are all lower than their respective second preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0056] The second preset temperature of each of the plurality of functional chips is lower than the first preset temperature of each of the functional chips.

[0057] Solution 4. The cooling control method according to Solution 3 is characterized in that the second preset temperature of each of the plurality of functional chips is greater than 94% of the first preset temperature of each of the plurality of functional chips.

[0058] Solution 5. The cooling control method according to Solution 1 is characterized in that the control system includes a plurality of functional chips, and the working mode is a FOTA mode. In the FOTA mode;

[0059] When the junction temperatures of the plurality of functional chips are all lower than their respective third preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0060] When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective third preset temperature and not higher than the respective fourth preset temperature, the flow rate of the cooling liquid is controlled to be the second preset flow rate;

[0061] wherein the third preset temperature of each of the plurality of functional chips is lower than the fourth preset temperature;

[0062] When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective fourth preset temperature, the flow rate of the cooling liquid is controlled to be the third preset flow rate;

[0063] The third preset flow rate is greater than the second preset flow rate.

[0064] Solution 6. The cooling control method according to Solution 1 is characterized in that the control system includes a plurality of functional chips, the working mode includes a communication failure mode, and in the communication failure mode, the required coolant flow rate is a fifth preset flow rate;

[0065] The higher the inlet coolant temperature is, the greater the fifth preset flow rate is.

[0066] Solution 7. The cooling control method according to Solution 1 is characterized in that the control system includes a plurality of functional chips, the working mode includes a normal working mode, and in the normal working mode;

[0067] When the inlet coolant temperature is lower than the external environment temperature, the flow rate of the coolant is controlled to be the fifteenth preset flow rate.

[0068] Solution 8. The cooling control method according to Solution 7 is characterized in that, in a normal working mode;

[0069] When the inlet coolant temperature is not less than the external environment temperature, the flow rate of the coolant is controlled to request the flow rate according to the mass production flow rate strategy.

[0070] Solution 9. The cooling control method according to Solution 8 is characterized in that the mass production flow strategy includes:

[0071] When the junction temperatures of the plurality of functional chips are all lower than their respective sixth preset temperatures, the flow rate of the cooling liquid is controlled to be zero;

[0072] When at least one of the junction temperatures of the plurality of functional chips is greater than the respective sixth preset temperature, the flow rate of the cooling liquid is controlled to be a fourth preset flow rate;

[0073] The junction temperature greater than the sixth preset temperature is divided into a plurality of temperature intervals, and as the temperature interval increases, the fourth preset flow rate gradually increases.

[0074] Solution 10. The cooling control method according to Solution 9 is characterized in that the junction temperature greater than the sixth preset temperature is divided into at least five temperature intervals; or

[0075] The junction temperature greater than the sixth preset temperature is divided into eight temperature intervals.

[0076] Solution 11. The cooling control method according to Solution 9 is characterized in that, within the same temperature range, the higher the inlet coolant temperature, the greater the fourth preset flow rate.

[0077] Solution 12. The cooling control method according to solution 2-10 is characterized in that an alarm is issued when at least one of the junction temperatures of the plurality of functional chips is not lower than the respective vehicle machine alarm temperature;

[0078] The vehicle machine alarm temperature of each of the plurality of functional chips is greater than the first preset temperature, the second preset temperature, the fourth preset temperature or the sixth preset temperature.

[0079] Solution 13. The cooling control method according to Solution 12 is characterized in that when the junction temperature of at least one of the plurality of functional chips is not lower than the respective overheat protection temperature, overheat protection is performed;

[0080] The overheat protection temperature of each of the plurality of functional chips is greater than the respective vehicle computer alarm temperature.

[0081] Solution 14. The cooling control method according to Solution 13 is characterized in that the control system includes an ADF chip and a SAF chip, and when the junction temperatures of the ADF chip and the SAF chip are higher than their respective frequency reduction temperatures, the corresponding chips are controlled to operate at reduced frequencies.

[0082] Scheme 15. A control system, characterized in that it adopts the cooling control method of the control system as described in any one of Schemes 1-14.

[0083] Option 16. A vehicle, characterized in that it includes a vehicle body and a control system as described in Option 15. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0085] Figure 1 is a flow chart of the cooling control method provided by the present invention;

[0086] Figure 2is a flow chart of the cooling control method provided by the present invention (in guard mode);

[0087] Figure 3 It is a flow chart of the cooling control method provided by the present invention (in guard mode (card temperature hysteresis interval));

[0088] Figure 4 is a flow chart of the cooling control method provided by the present invention (under FOTA mode);

[0089] Figure 5 It is a flow chart of the cooling control method provided by the present invention (under normal mode). DETAILED DESCRIPTION

[0090] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0091] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0092] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] In order to solve the problem of high energy consumption in the cooling process of the existing central computing unit. This embodiment discloses a vehicle, which includes a vehicle body and a control system. The control system specifically adopts a cooling control method, wherein the control system is specifically the central computing unit of the vehicle, which uses a coolant for cooling. The coolant is specifically transported by a water pump so that the coolant flows in the central computing unit to cool down each chip of the central computing unit.

[0094] like Figure 1 As shown, the cooling control method includes the following steps:

[0095] S001. Obtain the working mode of the control system, the junction temperature of the control system and the external environment temperature;

[0096] S002. Determine the flow strategy of the coolant according to the working mode, junction temperature and external ambient temperature. That is, fine control of the flow of the coolant can make the water pump not have to run at high load continuously, saving energy consumption and increasing the service life of the water pump.

[0097] Specifically, the control system includes multiple functional chips, including an ADF chip, a CDF chip, a VDF chip, a SAF chip and a Baseboard chip.

[0098] The working modes include guard mode, FOTA mode, normal working mode and overheat protection mode. The external environment temperature mainly participates in the determination of the flow strategy under the normal working mode.

[0099] Specifically, in the guard mode, when the junction temperatures of multiple functional chips are lower than their respective first preset temperatures, the flow rate of the coolant is controlled to be zero; that is, the cooling demand of the central computing unit can be met without the need for the coolant to flow.

[0100] When at least one of the junction temperatures of the multiple functional chips is not lower than the respective first preset temperature, the flow rate of the coolant is controlled to be the first preset flow rate. That is, when the junction temperature of one of the functional chips is higher than the first preset temperature, it means that the coolant flow rate at this time can no longer meet the cooling requirements of all the functional chips, and the flow rate needs to be increased to enhance the cooling capacity.

[0101] like Figure 2 As shown, in the guard mode, the cooling control method includes the following detailed steps:

[0102] S11, obtaining the junction temperature of the control system;

[0103] S12, determining whether the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, if yes, proceeding to step S13; if no, proceeding to step S14;

[0104] S13, the flow rate of the coolant is controlled to zero; after a preset time, step S11 is performed again; "the flow rate of the coolant is controlled to zero" mainly includes two situations. Before performing step S13, when the flow rate of the coolant is zero, the flow rate of the coolant continues to remain at zero; before performing step S13, when the flow rate of the coolant is the first preset flow rate, the flow rate of the coolant is reduced to zero.

[0105] S14, controlling the flow rate of the coolant to be a first preset flow rate, and performing step S11 again after a preset time.

[0106] The preset duration is the frequency interval duration of the detection.

[0107] Guard mode: Provides all-round protection for the car after the user leaves and locks the car. Through multiple sensing methods, accurate detection is carried out. When other people or cars approach the vehicle, there is a scratch, collision or illegal intrusion, the system will record the on-site video according to the preset three-level early warning mechanism, and promptly inform the owner of serious alarm events. That is, in guard mode, only the monitoring sensor is always in working condition, and the early warning system only records video and issues an alarm when approaching the vehicle or collides. It runs fewer programs and has lower power, resulting in less heat. Only when video recording and alarming are performed will the number of programs running increase, and the heat generated will increase, but the heat generated is also limited, so the flow required when cooling is required is also lower. There is no need to divide the junction temperature and flow into multiple intervals to meet the cooling needs, so the coolant flow control logic in guard mode is relatively simple.

[0108] The specific traffic requirements in guard mode are shown in Table 1.

[0109] Table 1, the matching relationship between junction temperature and flow in guard mode

[0110] In guard mode, since only one flow value is requested, the water pump is likely to start and stop frequently when approaching the point, that is, when the first preset temperature of each of the multiple functional chips is near. In order to solve this problem, a temperature hysteresis interval can be set, that is, when there is flow, the water pump can be turned off when the junction temperature is lower, so that there is no flow. The specific scheme is as follows: in guard mode; when the flow of the coolant is zero and the junction temperatures of the multiple functional chips are all lower than their respective first preset temperatures, the flow of the coolant is controlled to be zero; when at least one of the junction temperatures of the multiple functional chips is not lower than their respective first preset temperatures, the flow of the coolant is controlled to be the first preset flow; when the flow of the coolant is the first preset flow and the junction temperatures of the multiple functional chips are all lower than their respective second preset temperatures, the flow of the coolant is controlled to be zero; wherein the second preset temperatures of the multiple functional chips are lower than their respective first preset temperatures. That is, from no flow to flow, at least one temperature higher than the respective first preset temperature is required, and from flow to no flow, all temperatures lower than the respective second preset temperatures are required. In one embodiment, the difference between the first preset temperature and the second preset temperature of each of the multiple functional chips is less than 6% of the first preset temperature; that is, the second preset temperature of each of the multiple functional chips is greater than 94% of the first preset temperature. However, the second preset temperature of each of the multiple functional chips is less than 98% of the first preset temperature. This ensures that the temperature hysteresis interval has a certain value range, which can effectively avoid frequent start and stop.

[0111] The specific flow requirements in guard mode (increasing the temperature hysteresis range) are shown in Table 2.

[0112] like Figure 3 As shown, in the guard mode (increasing the temperature hysteresis interval), the cooling control method includes the following detailed steps:

[0113] S11, obtaining the junction temperature of the control system;

[0114] S12, determining whether the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, if yes, proceeding to step S13; if no, proceeding to step S16;

[0115] S13, determine whether the flow rate of the coolant is zero; if yes, the flow rate of the coolant continues to remain at zero, and step S11 is performed again after a preset time; if no, step S14 is performed.

[0116] S14, determining whether the junction temperatures of the plurality of functional chips are all lower than their respective second preset temperatures, if yes, proceeding to step S15; if no, the flow rate of the coolant is maintained at the first preset flow rate, and step S11 is performed again after a preset time;

[0117] S15, reducing the flow rate of the coolant to zero, and performing step S11 again after a preset time;

[0118] S16, controlling the flow rate of the coolant to be a first preset flow rate, and performing step S11 again after a preset time.

[0119] Table 2, the matching relationship between junction temperature and flow rate in guard mode (increasing temperature hysteresis interval)

[0120] In FOTA mode (online vehicle software upgrade mode); when the junction temperatures of multiple functional chips are lower than their respective third preset temperatures, the flow rate of the coolant is controlled to zero; due to the low junction temperature, there is no need to flow the coolant to meet the cooling needs of the central computing unit.

[0121] When at least one of the junction temperatures of multiple functional chips is not lower than the respective third preset temperature and not higher than the respective fourth preset temperature, the flow rate of the coolant is controlled to be the second preset flow rate; wherein the third preset temperature of each of the multiple functional chips is less than the fourth preset temperature; when at least one of the junction temperatures of multiple functional chips is not lower than the respective fourth preset temperature, the flow rate of the coolant is controlled to be the third preset flow rate; wherein the third preset flow rate is greater than the second preset flow rate. That is, when the junction temperature is low, a small flow rate is required to meet the cooling needs of each functional chip, but when the junction temperature is high, a larger flow rate is required to meet the cooling needs of each functional chip. Since the flow value requested by the FOTA mode is two, there is almost no phenomenon of frequent start and stop of the water pump, so there is no need to set the temperature hysteresis interval. The difference between the third preset temperature and the fourth preset temperature of each of the multiple functional chips is less than 6% of the respective storage preset temperature; that is, the fourth preset temperature of each of the multiple functional chips is greater than 94% of the respective third preset temperature.

[0122] like Figure 4 As shown, in FOTA mode, the cooling control method includes the following steps:

[0123] In guard mode, the cooling control method includes the following detailed steps:

[0124] S11, obtaining the junction temperature of the control system;

[0125] S12, determining whether the junction temperatures of the plurality of functional chips are all lower than their respective third preset temperatures, if yes, proceeding to step S13; if no, proceeding to step S14;

[0126] S13, the flow rate of the coolant is controlled to zero; after the preset time, step S11 is performed again; "the flow rate of the coolant is controlled to zero" mainly includes two situations. Before performing step S13, when the flow rate of the coolant is zero, the flow rate of the coolant continues to remain at zero; before performing step S13, when the flow rate of the coolant is the second preset flow rate or the third preset flow rate, the flow rate of the coolant is reduced to zero.

[0127] S14, determining whether the junction temperatures of the plurality of functional chips are all lower than their respective fourth preset temperatures, if yes, proceeding to step S15; if no, proceeding to step S16;

[0128] S15, the flow rate of the coolant is controlled to be the second preset flow rate; step S11 is performed again after the preset time; "the flow rate of the coolant is controlled to be the second preset flow rate" mainly includes three situations: if the flow rate of the coolant is zero before step S15, the flow rate of the coolant is controlled to be increased to the second preset flow rate; if the flow rate of the coolant is the second preset flow rate before step S15, the flow rate of the coolant is controlled to continue to be maintained at the second preset flow rate; if the flow rate of the coolant is the third preset flow rate before step S15, the flow rate of the coolant is controlled to be reduced to the second preset flow rate.

[0129] S16, the flow rate of the coolant is controlled to be the third preset flow rate; after the preset time, step S11 is performed again; "the flow rate of the coolant is controlled to be the third preset flow rate" mainly includes three situations: if before performing step S15, the flow rate of the coolant is zero, the flow rate of the coolant is controlled to be increased to the third preset flow rate; if before performing step S15, the flow rate of the coolant is the second preset flow rate, the flow rate of the coolant is controlled to be increased to the second preset flow rate; if before performing step S15, the flow rate of the coolant is the third preset flow rate, the flow rate of the coolant is controlled to continue to be maintained at the second preset flow rate.

[0130] FOTA mode: The whole vehicle ECU software is updated and upgraded, that is, the control system software is updated and upgraded. During this process, the power will increase compared to the guard mode, resulting in an increase in heat generation, and the junction temperature will rise faster. Moreover, after the heat increases, only a small coolant flow rate cannot meet the cooling needs of the control system. In this mode, the junction temperature needs to be divided into more junction temperature intervals and equipped with corresponding multiple flow intervals to keep the temperature of the control system within the normal temperature range.

[0131] In FOTA mode, the specific traffic requirements are shown in Table 3.

[0132] Table 3, the matching relationship between junction temperature and flow rate in FOTA mode

[0133] In the communication failure mode, the required coolant flow rate is the fifth preset flow rate; and the higher the inlet coolant temperature, the greater the required minimum flow rate. See Table 4 for details.

[0134] Communication failure mode: The control system cannot communicate with other controllers of the vehicle, and the vehicle water pump cannot respond to the flow demand issued by the control system. In this case, although most controllers cannot work properly, the control system is working, but the power is not too high, and a certain amount of coolant is required for cooling. Moreover, the higher the coolant temperature, the greater the required flow.

[0135] Table 4, the matching relationship between the inlet coolant temperature and the minimum flow rate in the communication fault mode

[0136] In normal working mode; when the inlet coolant temperature is lower than the external ambient temperature, the coolant flow rate is controlled to be the fifteenth preset flow rate.

[0137] The external environment temperature refers to the temperature at the air intake grille. The coolant is cooled by the coolant radiator installed on the inner side of the air intake grille in the vehicle for cooling the central computing unit (control system). Since the coolant is dissipated by the coolant radiator, the temperature of the coolant is higher than the external environment temperature during normal driving of the vehicle. However, when the vehicle is just started, especially at noon in winter, the coolant is at a lower temperature because the vehicle has been parked overnight. Although the outdoor environment temperature has risen, the coolant pipe is in the vehicle and its temperature will not rise in a short time. The coolant temperature will be lower than the external environment temperature, that is, the inlet coolant temperature is lower than the external environment temperature. At this time, there is a fourth preset flow rate, among which the fifteenth preset flow rate is relatively small, specifically 0.5L / min. It should be noted that the value of the fourth preset flow rate is not fixed. It can be changed according to the temperature of the inlet coolant or the external environment temperature.

[0138] In normal working mode; when the inlet coolant temperature is not less than the external ambient temperature, the coolant flow is controlled according to the mass production flow strategy request flow. At this time, the vehicle is basically running normally. The mass production flow strategy includes:

[0139] When the junction temperatures of multiple functional chips are all lower than their respective sixth preset temperatures, the flow rate of the cooling liquid is controlled to be zero. When at least one of the junction temperatures of multiple functional chips is greater than their respective sixth preset temperatures, the flow rate of the cooling liquid is controlled to be the fourth preset flow rate; the junction temperature greater than the sixth preset temperature is divided into multiple temperature intervals, and as the temperature of the temperature interval increases, the fourth preset flow rate gradually increases. The increase in the temperature interval temperature refers to the gradual increase in the average value of the temperature interval; that is, the larger the average temperature interval, the larger the first preset flow rate.

[0140] In this embodiment, preferably, the junction temperature greater than the sixth preset temperature is divided into eight temperature intervals. Dividing into multiple temperature intervals can better perform targeted control, so that each temperature interval has a corresponding coolant flow rate. Dividing into more intervals can perform refined control, and when the junction temperature is low, a large flow rate is not required, which can reduce the load of the water pump and thus reduce energy consumption. In addition, in the same temperature interval, the higher the inlet coolant temperature, the larger the fourth preset flow rate. The overall trend is gradually increasing, but when the inlet coolant temperature increases, the fourth preset flow rate may not change, especially when the flow rate is small, it may not change; as long as it can meet the cooling requirements of each functional chip. In particular, when the inlet coolant temperature is high and the junction temperature is high, a larger flow rate is required; by dividing into multiple intervals, a larger flow rate is avoided when the junction temperature is low, thereby better reducing the load of the water pump to reduce energy consumption. Since the flow value requested in the normal working mode is eight, there is almost no phenomenon of frequent start and stop of the water pump, so there is no need to set the temperature hysteresis interval.

[0141] In addition, when the inlet coolant temperature is low, even when the junction temperature is high, the fourth preset flow rate is relatively small, that is, the required maximum flow rate is small, which can make the water pump work under a smaller load, thereby saving energy consumption and cost.

[0142] The multiple temperature intervals are specifically: the temperature below the respective sixth preset temperature is classified as the first temperature interval, and the temperature above the respective sixth preset temperature is the second temperature interval, the third temperature interval, the fourth temperature interval, the fifth temperature interval, the sixth temperature interval, the seventh temperature interval, the eighth temperature interval and the ninth temperature interval, and the temperatures of the second temperature interval, the third temperature interval, the fourth temperature interval, the fifth temperature interval, the sixth temperature interval, the seventh temperature interval, the eighth temperature interval and the ninth temperature interval gradually increase. The coolant flow rates corresponding to the second temperature interval, the third temperature interval, the fourth temperature interval, the fifth temperature interval, the sixth temperature interval, the seventh temperature interval, the eighth temperature interval and the ninth temperature interval are the fifth preset flow rate, the sixth preset flow rate, the seventh preset flow rate, the eighth preset flow rate, the ninth preset flow rate, the tenth preset flow rate, the eleventh preset flow rate and the twelfth preset flow rate respectively.

[0143] Regarding the division of temperature intervals, it should be noted that it is not required that all functional chips are divided into the same number of intervals. In this embodiment, the VDF chip and the SAF chip are not divided into eight temperature intervals, but into three temperature intervals. The lowest temperature interval of these two functional chips matches the lowest temperature interval of other functional chips; together they determine whether to request the flow of the coolant to change according to the value corresponding to the interval. The second lowest temperature interval of these two functional chips matches the third lowest temperature interval of other functional chips; together they determine whether to request the flow of the coolant to change according to the value corresponding to the interval. The highest temperature interval of these two functional chips matches the third highest temperature interval of other functional chips, and together they determine whether to request the flow of the coolant to change according to the value corresponding to the interval.

[0144] like Figure 5 As shown, in normal mode, the cooling control method includes the following detailed steps:

[0145] S10, obtaining the inlet coolant temperature;

[0146] S101, determining whether the inlet coolant temperature is lower than the external environment temperature; if yes, controlling the coolant flow rate to be a fourth preset flow rate, and performing step S10 again after a preset time; if no, performing step S11;

[0147] S11, obtaining the junction temperature of the control system;

[0148] S12, determining whether the junction temperatures of the plurality of functional chips are all lower than their respective sixth preset temperatures, if yes, proceeding to step S13; if no, proceeding to step S14;

[0149] S13, the flow rate of the coolant is controlled to zero; after a preset time, step S10 is performed again; "the flow rate of the coolant is controlled to zero" mainly includes two situations. Before performing step S13, when the flow rate of the coolant is zero, the flow rate of the coolant continues to remain at zero; before performing step S13, when the flow rate of the coolant is not zero, the flow rate of the coolant is reduced to zero.

[0150] S14, determining whether the junction temperatures of the plurality of functional chips are all within the second temperature range, if yes, proceeding to step S15; if no, proceeding to step S16;

[0151] S15, the flow rate of the coolant is controlled to be the fifth preset flow rate; and step S10 is performed again after the preset time.

[0152] S16, determining whether the junction temperatures of the plurality of functional chips are all within the third temperature range, if yes, proceeding to step S17; if no, proceeding to step S18;

[0153] S17, the flow rate of the coolant is controlled to be a sixth preset flow rate; and step S10 is performed again after a preset time.

[0154] S18, determining whether the junction temperatures of the plurality of functional chips are all within the fourth temperature range, if yes, proceeding to step S19; if no, proceeding to step S20;

[0155] S19, the flow rate of the coolant is controlled to be the seventh preset flow rate; and step S10 is performed again after the preset time.

[0156] S20, determining whether the junction temperatures of the plurality of functional chips are all within the fifth temperature range, if yes, proceeding to step S21; if no, proceeding to step S22;

[0157] S21, the flow rate of the coolant is controlled to be an eighth preset flow rate; and step S10 is performed again after a preset time.

[0158] S22, determining whether the junction temperatures of the plurality of functional chips are all within the sixth temperature range, if yes, proceeding to step S23; if no, proceeding to step S24;

[0159] S23, the flow rate of the coolant is controlled to be a ninth preset flow rate; and step S10 is performed again after a preset time.

[0160] S24, determining whether the junction temperatures of the plurality of functional chips are all within the seventh temperature range, if yes, proceeding to step S25; if no, proceeding to step S26;

[0161] S25, the flow rate of the coolant is controlled to be the tenth preset flow rate; and step S10 is performed again after the preset time.

[0162] S26, determining whether the junction temperatures of the plurality of functional chips are all within the eighth temperature range, if yes, proceeding to step S27; if no, proceeding to step S28;

[0163] S27, the flow rate of the coolant is controlled to be the eleventh preset flow rate; and step S10 is performed again after the preset time.

[0164] S28, the flow rate of the coolant is controlled to be the twelfth preset flow rate; and step S10 is performed again after the preset time period.

[0165] Normal mode refers to normal driving and parking mode. In normal mode, all controllers and sensors of the vehicle perform their duties, the communication is good, and they are in normal working condition. At this time, the power of the control system is large, resulting in large heat generation, and the required coolant is also more precise. And the required flow rate is different for different coolant temperatures.

[0166] In normal working mode, the specific flow requirements are shown in Table 5.

[0167] Table 5, the matching relationship between junction temperature and flow rate under normal working mode

[0168] Regarding the division of temperature intervals, it should be noted that although eight intervals are selected in this embodiment, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, technical personnel in this field may divide the junction temperature greater than the sixth preset temperature into at least five temperature intervals, specifically six temperature intervals, seven temperature intervals or nine temperature intervals, etc., which do not deviate from the basic principles of the present invention and will fall within the protection scope of the present invention.

[0169] In normal working mode, when the inlet coolant temperature is lower than the external environment temperature, condensation may occur if the flow rate is large. The flow rate is requested according to the fourth preset flow rate, where the value of the fourth preset flow rate is small, that is, the flow rate is limited, which can avoid condensation in the coolant flow path. However, when the inlet coolant temperature is not lower than the external environment temperature, condensation will not occur even if the flow rate is large. Therefore, when the inlet coolant temperature is not lower than the external environment temperature, condensation will not occur. Therefore, cooling is performed according to the mass production flow strategy.

[0170] Since the flow rate in the guard mode and FOTA mode is small, that is, the current is limited, condensation will not occur, so there is no need to consider the influence of the external ambient temperature.

[0171] When at least one of the junction temperatures of multiple functional chips is not lower than the respective vehicle alarm temperature, an alarm is issued; wherein the respective vehicle alarm temperatures of the multiple functional chips are greater than the respective first preset temperatures; at the same time, the respective vehicle alarm temperatures of the multiple functional chips are also greater than the respective fourth preset temperatures; and the respective vehicle alarm temperatures of the multiple functional chips are also greater than the highest temperature of the respective highest temperature ranges. That is, the vehicle alarm temperature is a relatively high value, which is generally triggered when a fault occurs in the cooling system, such as a fault in the water pump or a blockage in the flow channel. The alarm method is specifically to display an alarm subtitle or an alarm symbol on the screen of the center console. Although the alarm subtitles are displayed in this embodiment, this is not a limitation of the present invention. Without departing from the principles of the present invention, in other embodiments, those skilled in the art may also choose to use a warning sound to give an alarm, or use a warning light to give an alarm, which does not deviate from the basic principles of the present invention and will fall within the protection scope of the present invention.

[0172] When at least one of the junction temperatures of multiple functional chips is not lower than their respective overheat protection temperatures, overheat protection is performed; wherein the respective overheat protection temperatures of multiple functional chips are greater than their respective vehicle computer alarm temperatures. Overheat protection is performed after the alarm signal is issued, and is basically triggered only when there is a fault in the cooling system, such as a water pump failure or a blockage in the flow channel.

[0173] When the junction temperatures of the ADF chip and the SAF chip are higher than their respective frequency reduction temperatures, the corresponding chips are controlled to operate at reduced frequencies.

[0174] In addition, the working modes are divided into guard mode, FOTA mode and normal working mode, and each mode is divided into multiple temperature ranges to make the flow control of the coolant more refined, which can not only meet the cooling needs of the control system, but also enable the water pump to always run according to the required load instead of always running at high load, saving the energy consumption of the water pump; at the same time, it can be used in electric vehicles to increase the vehicle's cruising range.

[0175] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A cooling control method for a control system, characterized in that: The steps include: Acquiring the working mode of the control system, the junction temperature of the control system and the external environment temperature; A flow strategy of the coolant is determined according to the working mode, the junction temperature and the external environment temperature.

2. The cooling control method according to claim 1, characterized in that: The control system includes a plurality of functional chips, and the working mode includes a guard mode. In the guard mode; When the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, the flow rate of the cooling liquid is controlled to be zero; When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective first preset temperature, the flow rate of the cooling liquid is controlled to be the first preset flow rate.

3. The cooling control method according to claim 1, characterized in that: The control system includes a plurality of functional chips, and the working mode includes a guard mode. In the guard mode; When the flow rate of the cooling liquid is zero and the junction temperatures of the plurality of functional chips are all lower than their respective first preset temperatures, the flow rate of the cooling liquid is controlled to be zero; When the flow rate of the cooling liquid is zero and at least one of the junction temperatures of the plurality of functional chips is not lower than the respective first preset temperature, the flow rate of the cooling liquid is controlled to be the first preset flow rate; When the flow rate of the cooling liquid is the first preset flow rate and the junction temperatures of the plurality of functional chips are all lower than their respective second preset temperatures, the flow rate of the cooling liquid is controlled to be zero; The second preset temperature of each of the plurality of functional chips is lower than the first preset temperature of each of the functional chips.

4. The cooling control method according to claim 3, characterized in that: The second preset temperature of each of the plurality of functional chips is greater than 94% of the first preset temperature of each of the plurality of functional chips.

5. The cooling control method according to claim 1, characterized in that: The control system includes a plurality of functional chips, the working mode is a FOTA mode, and in the FOTA mode; When the junction temperatures of the plurality of functional chips are all lower than their respective third preset temperatures, the flow rate of the cooling liquid is controlled to be zero; When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective third preset temperature and not higher than the respective fourth preset temperature, the flow rate of the cooling liquid is controlled to be the second preset flow rate; wherein the third preset temperature of each of the plurality of functional chips is lower than the fourth preset temperature; When at least one of the junction temperatures of the plurality of functional chips is not lower than the respective fourth preset temperature, the flow rate of the cooling liquid is controlled to be the third preset flow rate; The third preset flow rate is greater than the second preset flow rate.

6. The cooling control method according to claim 1, characterized in that: The control system includes a plurality of functional chips, the working mode includes a communication failure mode, and in the communication failure mode, the required coolant flow rate is a fifth preset flow rate; The higher the inlet coolant temperature is, the greater the fifth preset flow rate is.

7. The cooling control method according to claim 1, characterized in that: The control system includes a plurality of functional chips, and the working mode includes a normal working mode. In the normal working mode; When the inlet coolant temperature is lower than the external environment temperature, the flow rate of the coolant is controlled to be the fifteenth preset flow rate.

8. The cooling control method according to claim 7, characterized in that: In normal working mode; When the inlet coolant temperature is not less than the external environment temperature, the flow rate of the coolant is controlled to request the flow rate according to the mass production flow rate strategy.

9. The cooling control method according to claim 8, characterized in that: The mass production flow strategy includes: When the junction temperatures of the plurality of functional chips are all lower than their respective sixth preset temperatures, the flow rate of the cooling liquid is controlled to be zero; When at least one of the junction temperatures of the plurality of functional chips is greater than the respective sixth preset temperature, the flow rate of the cooling liquid is controlled to be a fourth preset flow rate; The junction temperature greater than the sixth preset temperature is divided into a plurality of temperature intervals, and as the temperature interval increases, the fourth preset flow rate gradually increases.

10. The cooling control method according to claim 9, characterized in that: Dividing the junction temperature greater than the sixth preset temperature into at least five of the temperature intervals; or The junction temperature greater than the sixth preset temperature is divided into eight temperature intervals.

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