Automobile water pump control method, device, electronic equipment and medium

Abstract

The present application relates to the field of vehicle thermal management, and more specifically, to a method, device, electronic device and medium for controlling an automobile water pump. The automobile water pump control method includes: determining the target water outlet temperature of the PTC heater according to the ambient temperature and the target heating temperature; determining the fixed duty cycle of the water pump according to the target water outlet temperature of the PTC heater; performing a first operation, including: determining the corrected duty cycle of the water pump according to the water outlet temperature of the water pump, the ambient temperature, the target water outlet temperature of the PTC heater and the fixed duty cycle of the water pump; controlling the water pump to work according to the corrected duty cycle of the water pump; in each sampling period, independently performing the first operation until the standard sampling period is reached, and the standard sampling period is the sampling period when the actual water outlet temperature of the PTC heater reaches the target water outlet temperature of the PTC heater; controlling the water pump to work according to the corrected duty cycle of the water pump in the previous sampling period of the standard sampling period until heating ends. The present application can reduce energy consumption while ensuring heating efficiency.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management, and more specifically, to a method, device, electronic equipment and medium for controlling an automobile water pump. Background Art

[0002] As the new energy vehicle market gradually matures, the recognition and acceptance of new energy vehicles are also increasing year by year. In the context of increasingly fierce market competition, only by striving for excellence in all aspects and making the best use of the hardware performance of the whole vehicle can we meet the increasing needs of consumers and promote the sustainable development of the new energy vehicle industry. New energy vehicles use PTC (Positive Temperature Coefficient) components to replace the heater water tank of fuel vehicles for air conditioning and heating. The water pump, PTC heater and heater core are connected in sequence, and the heater core is also connected to the water pump to form a heating circuit. In order to meet the heating needs of the passenger compartment, new energy vehicles mostly calculate the speed of the water pump and the heating power of the PTC heater by looking up the table based on the temperature set by the customer on the air conditioning panel. This method of looking up the table to control the speed of the water pump is direct and convenient, and does not require too much logical calculation and processing. It only needs to look up the table according to the actual flow corresponding to the different duty cycles of the water pump. This control method is undoubtedly satisfactory for pure electric vehicles in terms of passenger compartment heating efficiency, but there is still a lot of room for improvement in terms of energy consumption, which is the most critical aspect of pure electric vehicles.

[0003] In view of this, this application is hereby filed. Summary of the invention

[0004] The purpose of the present application is to provide a method, device, electronic device and medium for controlling an automobile water pump, so as to solve the problem in the prior art that it is impossible to reduce energy consumption while ensuring heating efficiency.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a method for controlling an automobile water pump, comprising:

[0007] Determine the target water outlet temperature of the PTC heater according to the ambient temperature and the target heating temperature;

[0008] Determining a fixed duty cycle of the water pump according to the target water outlet temperature of the PTC heater;

[0009] Executing a first operation, the first operation comprising: determining a water pump correction duty cycle according to the water pump outlet water temperature, the ambient temperature, the PTC heater target water outlet temperature and the water pump fixed duty cycle; controlling the water pump to operate according to the water pump correction duty cycle;

[0010] In each sampling period, the first operation is performed independently until the standard sampling period is reached, and the standard sampling period is the sampling period when the actual outlet water temperature of the PTC heater reaches the target outlet water temperature of the PTC heater;

[0011] The water pump is controlled to operate according to the water pump corrected duty cycle of the sampling period before the standard-reaching sampling period until heating is terminated.

[0012] As a further preferred technical solution, the method of determining a fixed duty cycle of a water pump according to the target water outlet temperature of the PTC heater includes:

[0013] Determining the required flow rate of the heater core according to the target water outlet temperature of the PTC heater;

[0014] The fixed duty cycle of the water pump is determined according to the required flow rate of the heater core.

[0015] As a further preferred technical solution, before determining the fixed duty cycle of the water pump, the method includes:

[0016] Determining the required flow rate of the heater core according to the target water outlet temperature of the PTC heater;

[0017] Determining the actual flow rate of the heater core according to the water outlet temperature of the water pump, the ambient temperature and the fixed duty cycle of the water pump;

[0018] A duty cycle correction coefficient is determined according to the required flow rate of the warm air core and the actual flow rate of the warm air core.

[0019] As a further preferred technical solution, before determining the actual flow rate of the heater core, a mapping relationship between the fixed duty cycle of the water pump and the pressure difference at both ends of the pipeline is pre-established, including:

[0020] Under the measured water outlet temperature of the water pump, different fixed duty ratios of the water pump are used to control the operation of the water pump, and the pressure difference at both ends of the pipeline is measured.

[0021] As a further preferred technical solution, before determining the fixed duty cycle of the water pump, the method includes:

[0022] Determining a target water viscosity coefficient according to a target water outlet temperature of the PTC heater;

[0023] Determine the current water viscosity coefficient according to the water outlet temperature of the water pump and the ambient temperature;

[0024] A duty cycle correction coefficient is determined according to the target water viscosity coefficient and the current water viscosity coefficient.

[0025] As a further preferred technical solution, before determining the fixed duty cycle of the water pump, the method includes:

[0026] According to the target water outlet temperature of the PTC heater and the water outlet temperature of the water pump, the duty cycle correction coefficient table is queried to determine the duty cycle correction coefficient; the duty cycle correction coefficient table includes a mapping relationship between the target water outlet temperature of the PTC heater, the water outlet temperature of the water pump and the duty cycle correction coefficient.

[0027] As a further preferred technical solution, the fixed duty cycle of the water pump is multiplied by the duty cycle correction coefficient to obtain a corrected duty cycle of the water pump.

[0028] In a second aspect, the present application provides an automobile water pump control device, comprising:

[0029] A PTC heater target water outlet temperature determination module, used to determine the PTC heater target water outlet temperature according to the ambient temperature and the target heating temperature;

[0030] A water pump fixed duty cycle determination module, used to determine the water pump fixed duty cycle according to the target water outlet temperature of the PTC heater;

[0031] A first operation execution module, configured to execute a first operation, wherein the first operation includes: determining a water pump correction duty cycle according to the water pump outlet water temperature, the ambient temperature, the PTC heater target water outlet temperature and the water pump fixed duty cycle; and controlling the water pump to operate according to the water pump correction duty cycle;

[0032] A cyclic execution module, which independently executes the first operation in each sampling period until a standard sampling period is reached, wherein the standard sampling period is a sampling period in which the actual outlet water temperature of the PTC heater reaches the target outlet water temperature of the PTC heater;

[0033] The constant control module is used to control the water pump to operate according to the water pump modified duty cycle of the sampling period before the standard-reaching sampling period until the heating is finished.

[0034] In a third aspect, the present application provides an electronic device, including:

[0035] at least one processor, and a memory communicatively coupled to at least one of the processors;

[0036] The memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors so that at least one of the processors can perform the above method.

[0037] In a fourth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute the above method.

[0038] Compared with the prior art, the beneficial effects of this application are:

[0039] The automobile water pump control method provided in the present application determines the target water outlet temperature of the PTC heater according to the ambient temperature and the target heating temperature; determines the fixed duty cycle of the water pump according to the target water outlet temperature of the PTC heater; performs a first operation, the first operation including: determining the corrected duty cycle of the water pump according to the water outlet temperature of the water pump, the ambient temperature, the target water outlet temperature of the PTC heater and the fixed duty cycle of the water pump; controlling the water pump to work according to the corrected duty cycle of the water pump; in each sampling period, the first operation is performed independently until the standard sampling period is reached, the standard sampling period is the sampling period when the actual water outlet temperature of the PTC heater reaches the target water outlet temperature of the PTC heater; the water pump is controlled to work according to the corrected duty cycle of the water pump in the previous sampling period of the standard sampling period until the heating is terminated. The method dynamically corrects the duty cycle of the water pump based on factors such as the water outlet temperature of the water pump and the target water outlet temperature of the PTC heater in each sampling period, so that the flow rate of each sampling period can be kept constant, the working power consumption of the water pump is reduced, and the vehicle endurance is improved.

[0040] Furthermore, changes in water temperature usually cause changes in the viscosity coefficient of water, which in turn affects the actual water flow rate output. For example, when the water temperature rises, the viscosity coefficient will decrease and the actual water flow rate will increase. The present application takes into account the change of viscosity coefficient with temperature and adjusts the water pump to correct the duty cycle to ensure a constant output water flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 It is a flow chart of the automobile water pump control method provided by the present application;

[0043] Figure 2 It is a structural schematic diagram of the automobile water pump control device provided by the present application;

[0044] Figure 3 It is a structural schematic diagram of the electronic device provided by this application. DETAILED DESCRIPTION

[0045] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0046] First of all, it should be noted that during the operation of the water pump, the flow rate of the fluid in the water pump is directly proportional to the duty cycle and inversely proportional to the viscosity coefficient of the fluid, while the viscosity coefficient of the fluid is inversely proportional to the temperature of the fluid. That is to say, when the duty cycle remains unchanged, the higher the temperature of the fluid, the lower the viscosity coefficient of the fluid, and the higher the flow rate of the fluid. The prior art uses a fixed duty cycle to control the operation of the water pump by looking up a table. As the heating progresses, the water temperature gradually increases dynamically, and the fluid flow rate in the heater core increases, which will lead to energy waste. Therefore, this application fully considers factors such as ambient temperature, target heating temperature, and water pump outlet temperature, and adjusts / corrects the duty cycle of the water pump in real time during each sampling period, thereby reducing the energy waste caused by the fixed duty cycle while meeting the heating efficiency. The following is a specific explanation in conjunction with the embodiments.

[0047] Example 1

[0048] Figure 1 This is a flow chart of a vehicle water pump control method provided in this embodiment. This embodiment is suitable for controlling the water pump after the vehicle heating air conditioner is turned on, or controlling the water pump when there is a need to heat the vehicle power battery. This method can be executed by an automobile water pump control device, which can be composed of software and / or hardware and is generally integrated in an electronic device, which can be an air conditioning controller, a vehicle controller or a BMS (battery management system). For ease of understanding, each step in the control method of this embodiment is executed by the vehicle controller.

[0049] like Figure 1 As shown, this embodiment provides a method for controlling a vehicle water pump, comprising the following steps:

[0050] S110: Determine a target outlet water temperature of the PTC heater according to the ambient temperature and the target heating temperature.

[0051] Among them, "ambient temperature" refers to the temperature of the external environment of the vehicle before starting heating or heating. When heating is needed, the ambient temperature is usually lower than the target heating temperature. The ambient temperature is, for example, -25°C, -20°C, -15°C, -10°C, -5°C, 0°C or 5°C. "Target heating temperature" refers to the temperature that the passenger compartment or power battery is expected to reach, such as 22°C, 23°C, 24°C, 25°C or 26°C. The target heating temperature can be set manually by the user, or by the air conditioning system or the power battery system based on the ambient temperature. "PTC heater target water outlet temperature" refers to the temperature that the water at the water outlet of the PTC heater is expected to reach. This temperature is conducive to the heat exchange between the heater core and the passenger compartment, so that the passenger compartment reaches the target heating temperature as soon as possible. Generally speaking, the target water outlet temperature of the PTC heater is higher than the target heating temperature.

[0052] In some examples, the target water outlet temperature of the PTC heater can be determined according to the ambient temperature and the target heating temperature by querying the first data table; the first data table includes a mapping relationship between the ambient temperature, the target heating temperature, and the target water outlet temperature of the PTC heater. The first data table can be preset in the automobile water pump control device, and Table 1 is an example of the first data table.

[0053] Table 1

[0054]

[0055] S120: Determine a fixed duty cycle of the water pump according to the target water outlet temperature of the PTC heater.

[0056] Among them, the "fixed duty cycle of the water pump" can also be called the initial value of the water pump duty cycle. The water pump can be a self-heating water pump. The duty cycle can also be understood as the speed. The higher the duty cycle, the greater the flow rate at the same temperature. The fixed duty cycle of the water pump is mainly used to determine the corrected duty cycle of the water pump later.

[0057] In an optional implementation, determining a fixed duty cycle of a water pump according to a target outlet water temperature of the PTC heater includes:

[0058] Determining the required flow rate of the heater core according to the target water outlet temperature of the PTC heater;

[0059] The fixed duty cycle of the water pump is determined according to the required flow rate of the heater core.

[0060] The "required flow rate of the heater core" refers to the flow rate required to make the passenger compartment or power battery reach the target heating temperature, assuming that the actual water outlet temperature of the PTC heater reaches the target water outlet temperature of the PTC heater.

[0061] This optional implementation manner first determines the required flow rate of the warm air core according to the target water outlet temperature of the PTC heater; and then determines the fixed duty cycle of the water pump according to the required flow rate of the warm air core.

[0062] In some examples, the required flow rate of the warm air core corresponding to the target water outlet temperature of the PTC heater is calibrated in advance according to the bench and environmental chamber experiments in the early stage of the project, and stored in the automobile water pump control device in the form of a second data table. The second data table includes the mapping relationship between the target water outlet temperature of the PTC heater and the required flow rate of the warm air core. By querying the second data table, the required flow rate of the warm air core at the target water outlet temperature of the specific PTC heater can be determined. Table 2 is an example of the second data table.

[0063] Table 2

[0064]

[0065] In some examples, after obtaining the required flow rate of the heater core by querying Table 2, the fixed duty cycle of the water pump can be determined by combining the required flow rate of the heater core and the third data table; the third data table includes the mapping relationship between the required flow rate of the heater core and the fixed duty cycle of the water pump. The third data table is also stored in the automobile water pump control device. The mapping relationship in the third data table is related to the hardware performance of the water pump itself. The flow delivery capacity that the water pump can meet under different duty cycles is determined based on the working performance of the water pump and the actual verification of the previous bench. Table 3 is an example of the third data table.

[0066] Table 3

[0067]

[0068] In an optional embodiment, before determining the fixed duty cycle of the water pump, a step of determining a duty cycle correction coefficient is also included, and this step can adopt any one of the following optional methods 1 to 3.

[0069] Option 1:

[0070] Determining the required flow rate of the heater core according to the target water outlet temperature of the PTC heater;

[0071] Determining the actual flow rate of the heater core according to the water outlet temperature of the water pump, the ambient temperature and the fixed duty cycle of the water pump;

[0072] A duty cycle correction coefficient is determined according to the required flow rate of the warm air core and the actual flow rate of the warm air core.

[0073] Among them, the "duty cycle correction coefficient" refers to the coefficient used to characterize the relationship between the fixed duty cycle of the water pump and the corrected duty cycle of the water pump. The "actual flow rate of the heater core" refers to the actual flow rate of water flowing through the heater core under the conditions of the water pump outlet temperature, ambient temperature and the fixed duty cycle of the water pump. This flow rate is usually greater than the required flow rate of the heater core. The duty cycle correction coefficient determined by this method comprehensively considers the water pump outlet temperature, ambient temperature, target water outlet temperature of the PTC heater and the fixed duty cycle of the water pump, so the corrected duty cycle of the water pump can be accurately controlled. The essence of this method is to use the required flow rate of the heater core and the actual flow rate of the heater core to determine the duty cycle correction coefficient.

[0074] In some examples, the required flow rate Q of the heater core can be obtained by querying Table 2 in S120. Actual flow rate Q of the heater core act The following formula can be used for calculation: ,in, R is the pipe radius, is the pressure difference between the two ends of the pipeline, η0 is the viscosity coefficient of the coolant at ambient temperature, T is the water outlet temperature of the pump, T 0 is the ambient temperature, C is a constant, L is the length of the pipeline. Related to the fixed duty cycle of the water pump, when the duty cycle remains unchanged, the water pump power is unchanged, and the pressure difference at both ends of the pipeline is also unchanged. The pressure difference can be obtained by checking the fourth data table. The fourth data table includes a mapping relationship between the fixed duty cycle of the water pump and the pressure difference at both ends of the pipeline. The fourth data table can be obtained by calibration, that is, at the measured water outlet temperature of the water pump, by adopting different water pump duty cycles to measure the pressure difference at both ends of the pipeline. C The coolant with a certain viscosity coefficient at different temperatures (such as ethanol) can be used for testing to fit the C The specific value of can be -13.8629. Table 4 is an example of the fourth data table. After obtaining the required flow rate of the warm air core and the actual flow rate of the warm air core, the ratio of the required flow rate of the warm air core to the actual flow rate of the warm air core is Q / Q act As the duty cycle correction factor.

[0075] In an optional implementation, before determining the actual flow rate of the heater core, a mapping relationship between the fixed duty cycle of the water pump and the pressure difference at both ends of the pipeline is pre-established, including:

[0076] Under the measured water outlet temperature of the water pump, different fixed duty ratios of the water pump are used to control the operation of the water pump, and the pressure difference at both ends of the pipeline is measured.

[0077] Table 4

[0078]

[0079] Option 2:

[0080] Determining a target water viscosity coefficient according to a target water outlet temperature of the PTC heater;

[0081] Determine the current water viscosity coefficient according to the water outlet temperature of the water pump and the ambient temperature;

[0082] A duty cycle correction coefficient is determined according to the target water viscosity coefficient and the current water viscosity coefficient.

[0083] The essence of this method is to use the target water viscosity coefficient and the current water viscosity coefficient to determine the duty cycle correction coefficient. As mentioned above, the flow rate of the fluid is inversely proportional to the viscosity coefficient of the fluid. Therefore, the duty cycle correction coefficient can also be determined by using the above two viscosity coefficients, and there is no need to consider parameters such as pipeline length and pipeline radius, and the calculation is more accurate. Among them, the "target water viscosity coefficient" refers to the viscosity coefficient of water at the target outlet water temperature of the PTC heater. The viscosity coefficient can be obtained by calibration, that is, a viscosity coefficient calibration test is performed at different temperatures (such as the falling ball method, etc.). The "current water viscosity coefficient" refers to the viscosity coefficient of water at the outlet water temperature of the water pump (an actual temperature value) and the ambient temperature.

[0084] In some examples, the target water viscosity coefficient η can be obtained by querying the fifth data table, which includes the mapping relationship between the target water outlet temperature of the PTC heater and the target water viscosity coefficient. Table 5 is an example of the fifth data table. The current water viscosity coefficient η' can be calculated using the following formula: Where η0 is the viscosity coefficient of water at ambient temperature, T The water outlet temperature of the water pump (a temperature sensor is installed at the water outlet of the water pump to provide real-time feedback on the current water outlet temperature). T 0 is the ambient temperature, C Finally, the ratio of the current water viscosity coefficient to the target water viscosity coefficient η' / η is used as the duty cycle correction coefficient.

[0085] Table 5

[0086]

[0087] Option three:

[0088] According to the target water outlet temperature of the PTC heater and the water outlet temperature of the water pump, the duty cycle correction coefficient table is queried to determine the duty cycle correction coefficient; the duty cycle correction coefficient table includes a mapping relationship between the target water outlet temperature of the PTC heater, the water outlet temperature of the water pump and the duty cycle correction coefficient.

[0089] This method determines the duty cycle correction coefficient by querying the duty cycle correction coefficient table according to the target water outlet temperature of the PTC heater and the water outlet temperature of the water pump. It is faster and more convenient. The duty cycle correction coefficient table can be pre-constructed using the above optional method 1 or optional method 2. Table 6 is an example of a duty cycle correction coefficient table.

[0090] Table 6

[0091]

[0092] S130, executing a first operation, the first operation comprising: determining a corrected duty cycle of the water pump according to the water outlet temperature of the water pump, the ambient temperature, the target water outlet temperature of the PTC heater and the fixed duty cycle of the water pump; and controlling the water pump to operate according to the corrected duty cycle of the water pump.

[0093] The "corrected duty cycle of the water pump" refers to the duty cycle after the fixed duty cycle of the water pump is corrected. The corrected duty cycle of the water pump is usually lower than the fixed duty cycle of the water pump to achieve energy saving. This step first determines the corrected duty cycle of the water pump, and then controls the water pump to work according to the corrected duty cycle of the water pump.

[0094] In this embodiment, the ambient temperature, the water outlet temperature of the water pump and the actual water outlet temperature of the PTC heater can all be collected by the water temperature sensor in a set sampling period.

[0095] In an optional implementation, the fixed duty cycle of the water pump and the duty cycle correction coefficient are multiplied to obtain the corrected duty cycle of the water pump.

[0096] Water pump correction duty cycle W A It can be calculated by the following formula: A =K·W D , K is the duty cycle correction coefficient, W D Fixed duty cycle for the water pump.

[0097] S140. In each sampling period, the first operation is performed independently until a standard sampling period is reached, and the standard sampling period is a sampling period in which the actual outlet water temperature of the PTC heater reaches the target outlet water temperature of the PTC heater.

[0098] In step S130 of this embodiment, the water pump has been controlled to work according to the corrected duty cycle of the water pump, so in the next sampling cycle, the actual water outlet temperature of the PTC heater and the water outlet temperature of the water pump will change. If the actual water outlet temperature of the PTC heater has not reached the target water outlet temperature of the PTC heater, the duty cycle needs to be corrected again. If it has reached the target water outlet temperature, the duty cycle does not need to be corrected. Based on the above principle, this step performs the first operation independently in each sampling cycle until the standard sampling cycle is reached. The standard sampling cycle is the sampling cycle when the actual water outlet temperature of the PTC heater reaches the target water outlet temperature of the PTC heater. In this way, dynamic adjustment of the duty cycle is achieved. It should be noted that since the ambient temperature will not fluctuate too much under heating conditions, the fixed value in S110 is used.

[0099] This step implies that in each sampling period after S130, it is necessary to determine whether the actual outlet water temperature of the PTC heater reaches the target outlet water temperature of the PTC heater; if so, the first operation is performed, if not, the sampling period is determined to be a qualified sampling period. It can be understood that the above "independently" means that each sampling period does not affect each other and uses the data in its own sampling period to calculate the water pump correction duty cycle and control the water pump operation.

[0100] The above sampling period is the sampling period of each water temperature sensor, which can be 5s, 10s, 20s, 30s or 60s, etc.

[0101] S150, controlling the water pump to operate according to the water pump corrected duty cycle of the sampling period before the standard-reaching sampling period until heating is terminated.

[0102] After reaching the standard sampling period, there is no need to adjust the duty cycle any more, and it needs to operate at a constant duty cycle afterwards. Therefore, the water pump corrects the duty cycle of the sampling period before the standard sampling period and operates until the heating ends.

[0103] The above-mentioned automobile water pump control method determines the target water outlet temperature of the PTC heater according to the ambient temperature and the target heating temperature; determines the fixed duty cycle of the water pump according to the target water outlet temperature of the PTC heater; performs a first operation, the first operation including: determining the corrected duty cycle of the water pump according to the water outlet temperature of the water pump, the ambient temperature, the target water outlet temperature of the PTC heater and the fixed duty cycle of the water pump; controlling the water pump to work according to the corrected duty cycle of the water pump; in each sampling period, the first operation is performed independently until the standard sampling period is reached, the standard sampling period is the sampling period when the actual water outlet temperature of the PTC heater reaches the target water outlet temperature of the PTC heater; the water pump is controlled to work according to the corrected duty cycle of the water pump in the previous sampling period of the standard sampling period until the heating is terminated. The method dynamically corrects the duty cycle of the water pump based on factors such as the water outlet temperature of the water pump and the target water outlet temperature of the PTC heater in each sampling period, so that the flow rate of each sampling period can be kept constant, the working power consumption of the water pump is reduced, and the vehicle endurance is improved.

[0104] Furthermore, changes in water temperature usually cause changes in the viscosity coefficient of water, which in turn affects the actual water flow rate output. For example, when the water temperature rises, the viscosity coefficient will decrease and the actual water flow rate will increase. The present application takes into account the change of viscosity coefficient with temperature and adjusts the water pump to correct the duty cycle to ensure a constant output water flow rate.

[0105] Example 2

[0106] like Figure 2 As shown, this embodiment provides a vehicle water pump control device, including:

[0107] A PTC heater target water outlet temperature determination module 201 is used to determine the PTC heater target water outlet temperature according to the ambient temperature and the target heating temperature;

[0108] A water pump fixed duty cycle determination module 202, configured to determine a water pump fixed duty cycle according to a target water outlet temperature of the PTC heater;

[0109] The first operation execution module 203 is used to execute the first operation, wherein the first operation includes: determining a water pump correction duty cycle according to the water pump outlet water temperature, the ambient temperature, the PTC heater target water outlet temperature and the water pump fixed duty cycle; and controlling the water pump to operate according to the water pump correction duty cycle;

[0110] The loop execution module 204 independently executes the first operation in each sampling period until the standard sampling period is reached, and the standard sampling period is the sampling period when the actual outlet water temperature of the PTC heater reaches the target outlet water temperature of the PTC heater;

[0111] The constant control module 205 is used to control the water pump to operate according to the water pump modified duty cycle of the sampling period before the standard-reaching sampling period until the heating is finished.

[0112] The device is used to execute the above method, and thus has at least functional modules and beneficial effects corresponding to the above method.

[0113] Example 3

[0114] like Figure 3 As shown, this embodiment provides an electronic device, including:

[0115] at least one processor; and

[0116] a memory communicatively connected to at least one of the processors; wherein,

[0117] The memory stores instructions executable by at least one of the processors, and the instructions are executed by at least one of the processors to enable at least one of the processors to perform the above method. At least one processor in the electronic device can perform the above method, and thus has at least the same advantages as the above method.

[0118] Optionally, the electronic device also includes interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the electronic device, including instructions stored in or on a memory to display graphical information of a GUI (Graphical User Interface) on an external input / output device (such as a display device coupled to an interface). In other embodiments, if necessary, multiple processors can be used together with multiple memories, and / or multiple buses can be used together with multiple memories. Similarly, multiple electronic devices can be connected (for example, as a server array, a group of blade servers, or a multi-processor system), and each device provides some necessary operations. Figure 3 A processor 301 is taken as an example.

[0119] The memory 302 is a computer-readable storage medium that can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the automobile water pump control method in the embodiment of the present application (for example, the PTC heater target water outlet temperature determination module, the water pump fixed duty cycle determination module, the first operation execution module, the cycle execution module, and the constant control module in the automobile water pump control device). The processor 301 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 302, that is, realizes the above-mentioned automobile water pump control method.

[0120] The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 302 may further include a memory remotely arranged relative to the processor 301, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0121] The electronic device may further include: an input device 303 and an output device 304. The processor 301, the memory 302, the input device 303 and the output device 304 may be connected via a bus or other means. Figure 3 The example of connecting through bus is taken in the following.

[0122] The input device 303 can receive input digital or character information, and the output device 304 can include a display device, an auxiliary lighting device (e.g., LED), and a tactile feedback device (e.g., a vibration motor), etc. The display device can include, but is not limited to, a liquid crystal display (LCD), a light emitting diode (LED) display, and a plasma display. In some embodiments, the display device can be a touch screen.

[0123] Example 4

[0124] This embodiment provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute the above method. The computer instructions on the computer-readable storage medium are used to enable a computer to execute the above method, and thus have at least the same advantages as the above method.

[0125] The medium in this application may adopt any combination of one or more computer-readable media. The medium may be a computer-readable signal medium or a computer-readable storage medium. The medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of the medium (a non-exhaustive list) include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, the medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device, or device.

[0126] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0127] The program code contained on the computer-readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire, optical cable, RF (Radio Frequency), etc., or any suitable combination of the above.

[0128] Computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0129] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution disclosed in this application can be achieved, and this document is not limited here.

[0130] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A method for controlling an automobile water pump, characterized in that: include: Determine the target water outlet temperature of the PTC heater according to the ambient temperature and the target heating temperature; Determining a fixed duty cycle of the water pump according to the target water outlet temperature of the PTC heater; Executing a first operation, the first operation comprising: determining a water pump correction duty cycle according to a water pump outlet water temperature, the ambient temperature, a target water outlet temperature of the PTC heater, and a fixed duty cycle of the water pump; Controlling the water pump to operate according to the water pump modified duty cycle; In each sampling period, the first operation is performed independently until the standard sampling period is reached, and the standard sampling period is the sampling period when the actual outlet water temperature of the PTC heater reaches the target outlet water temperature of the PTC heater; Control the water pump to work according to the water pump modified duty cycle of the sampling period before the standard-reaching sampling period until heating is finished; Before determining the fixed duty cycle of the water pump, the method includes: According to the target water outlet temperature of the PTC heater and the water outlet temperature of the water pump, query the duty cycle correction coefficient table to determine the duty cycle correction coefficient; the duty cycle correction coefficient table includes a mapping relationship between the target water outlet temperature of the PTC heater, the water outlet temperature of the water pump and the duty cycle correction coefficient; The duty cycle correction coefficient is determined in the following manner: Determining the required flow rate of the heater core according to the target water outlet temperature of the PTC heater; Determining the actual flow rate of the heater core according to the water outlet temperature of the water pump, the ambient temperature and the fixed duty cycle of the water pump; Determining a duty cycle correction coefficient according to the required flow rate of the heater core and the actual flow rate of the heater core; or determining a target water viscosity coefficient according to the target water outlet temperature of the PTC heater; Determine the current water viscosity coefficient according to the water outlet temperature of the water pump and the ambient temperature; Determining a duty cycle correction coefficient according to the target water viscosity coefficient and the current water viscosity coefficient; The fixed duty cycle of the water pump is multiplied by the duty cycle correction coefficient to obtain a corrected duty cycle of the water pump.

2. The automobile water pump control method according to claim 1, characterized in that: The step of determining a fixed duty cycle of a water pump according to a target outlet water temperature of the PTC heater comprises: Determining the required flow rate of the heater core according to the target water outlet temperature of the PTC heater; The fixed duty cycle of the water pump is determined according to the required flow rate of the heater core.

3. The automobile water pump control method according to claim 1, characterized in that: Before determining the actual flow rate of the heater core, a mapping relationship between the fixed duty cycle of the water pump and the pressure difference at both ends of the pipeline is pre-established, including: Under the measured water outlet temperature of the water pump, different fixed duty ratios of the water pump are used to control the operation of the water pump, and the pressure difference at both ends of the pipeline is measured.

4. An automobile water pump control device, characterized in that: include: A PTC heater target water outlet temperature determination module, used to determine the PTC heater target water outlet temperature according to the ambient temperature and the target heating temperature; A water pump fixed duty cycle determination module, used to determine the water pump fixed duty cycle according to the target water outlet temperature of the PTC heater; A first operation execution module, configured to execute a first operation, wherein the first operation includes: determining a water pump correction duty cycle according to the water pump outlet water temperature, the ambient temperature, the PTC heater target water outlet temperature and the water pump fixed duty cycle; and controlling the water pump to operate according to the water pump correction duty cycle; A cyclic execution module, which independently executes the first operation in each sampling period until a standard sampling period is reached, wherein the standard sampling period is a sampling period in which the actual outlet water temperature of the PTC heater reaches the target outlet water temperature of the PTC heater; A constant control module, used for controlling the water pump to operate according to the water pump modified duty cycle of the sampling period before the standard-reaching sampling period until heating is terminated; Before determining the fixed duty cycle of the water pump, the method includes: According to the target water outlet temperature of the PTC heater and the water outlet temperature of the water pump, query the duty cycle correction coefficient table to determine the duty cycle correction coefficient; the duty cycle correction coefficient table includes a mapping relationship between the target water outlet temperature of the PTC heater, the water outlet temperature of the water pump and the duty cycle correction coefficient; The duty cycle correction coefficient is determined in the following manner: Determining the required flow rate of the heater core according to the target water outlet temperature of the PTC heater; Determining the actual flow rate of the heater core according to the water outlet temperature of the water pump, the ambient temperature and the fixed duty cycle of the water pump; Determining a duty cycle correction coefficient according to the required flow rate of the heater core and the actual flow rate of the heater core; or determining a target water viscosity coefficient according to the target water outlet temperature of the PTC heater; Determine the current water viscosity coefficient according to the water outlet temperature of the water pump and the ambient temperature; Determining a duty cycle correction coefficient according to the target water viscosity coefficient and the current water viscosity coefficient; The fixed duty cycle of the water pump is multiplied by the duty cycle correction coefficient to obtain a corrected duty cycle of the water pump.

5. An electronic device, characterized in that: include: at least one processor, and a memory communicatively coupled to at least one of the processors; The memory stores instructions executable by at least one of the processors, and the instructions are executed by at least one of the processors so that the at least one processor can execute the method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that: The medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method according to any one of claims 1 to 3.

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