Electronic water pump control method, device and equipment and vehicle

Abstract

The invention provides an electronic water pump control method, device and equipment and a vehicle, and is applied to the technical field of heating, the electronic water pump is controlled to be started in response to a heating starting request before a first preset duration before a heater is started, and the electronic water pump is controlled to be stopped in response to a heating stopping request. And the electronic water pump is controlled to be closed after the heater is closed and a second preset duration. In this way, the electronic water pump is started in advance before the heater is started when heating is started, the pipeline can be fully filled with cooling liquid, residual gas generated when the cooling liquid is injected is discharged, the electronic water pump is delayed to be closed after the heater is closed when heating is closed, residual heat of the heater can be dissipated, and bubbles generated by local high temperature of the cooling liquid are avoided; therefore, bubbles are prevented from entering the electronic water pump chamber to generate a gas-liquid effect.

Description

Technical Field

[0001] The present application relates to the technical field of heating, and particularly relates to an electronic water pump control method, device, equipment and vehicle. Background Art

[0002] Currently, the heating systems of vehicles, especially new energy vehicles, usually use positive temperature coefficient (PTC) heaters for heating. Due to the sudden changes in pressure and temperature caused by the start-up, shutdown or loop switching of the heating system in the coolant circulation pipeline, the gas dissolved in the coolant may precipitate or external gas may mix into the coolant, thus generating bubbles. As the heating system works, the bubbles may enter the chamber of the electronic water pump to produce a gas-liquid effect, causing cavitation or high temperature, resulting in wear of the electronic water pump or even system failure. Summary of the Invention

[0003] Based on the above-mentioned defects and deficiencies of the prior art, the present application proposes an electronic water pump control method, device, equipment and vehicle, which can turn on the electronic water pump in advance before turning on the heater when the heating system starts heating, and turn off the electronic water pump after a delay after turning off the heater when the heating system stops heating, so as to avoid the generation of water bubbles causing a gas-liquid effect and solve the problem that the water bubbles may enter the chamber of the electronic water pump, resulting in wear of the water pump or even failure of the heating system.

[0004] According to the first aspect of the embodiments of the present application, an electronic water pump control method is provided, which is applied to a heating system. The heating system includes an electronic water pump, a heater and a heater core. The electronic water pump is used to drive the coolant to flow through the heater and the heater core. The method includes:

[0005] In response to a heating start request, control the electronic water pump to turn on before the heater is turned on, and the time interval between the turn-on time of the heater and the turn-on time of the electronic water pump is a first preset duration;

[0006] In response to a heating shutdown request, control the electronic water pump to turn off after the heater is turned off and after a second preset duration.

[0007] According to the second aspect of the embodiments of the present application, an electronic water pump control device is provided, which is applied to a heating system. The heating system includes an electronic water pump, a heater and a heater core. The electronic water pump is used to drive the coolant to flow through the heater and the heater core. The device includes:

[0008] A heating start module, configured to control the electronic water pump to turn on before the heater is turned on in response to a heating start request, and the time interval between the turn-on time of the heater and the turn-on time of the electronic water pump is a first preset duration;

[0009] A heating shutdown module, configured to, in response to a heating shutdown request, control the electronic water pump to shut down after the heater is shut down and a second preset duration has elapsed.

[0010] According to a third aspect of the embodiments of the present application, an electronic device is provided, including a memory and a processor;

[0011] The memory is connected to the processor and is used for storing programs;

[0012] The processor is configured to, by running the programs in the memory, implement the electronic water pump control method as described in the first aspect.

[0013] According to a fourth aspect of the embodiments of the present application, a storage medium is provided. A computer program is stored on the storage medium, and when the computer program is run by a processor, the electronic water pump control method as described in the first aspect is implemented.

[0014] According to a fifth aspect of the embodiments of the present application, a computer program product is provided. The computer program product includes computer program instructions, and when the computer program instructions are run by a processor, the processor is caused to execute the electronic water pump control method as described in the first aspect.

[0015] According to a sixth aspect of the embodiments of the present application, a vehicle is provided. A heating system is installed in the vehicle, and the electronic water pump control device as described in the second aspect or the electronic device as described in the third aspect is provided in the heating system.

[0016] In the above-mentioned electronic water pump control method, device, equipment, and vehicle, the electronic water pump can be controlled to start before a first preset duration before the heater is turned on in response to a heating start request. After that, in response to a heating shutdown request, the electronic water pump is controlled to shut down after the heater is shut down and a second preset duration has elapsed. In this way, starting the electronic water pump in advance before turning on the heater during heating startup can enable the coolant to fully fill the pipeline and discharge the residual gas during coolant filling. When heating is shut down, delaying the shutdown of the electronic water pump after turning off the heater can dissipate the residual heat of the heater, avoid local high temperature of the coolant from generating bubbles, and thus avoid the gas-liquid effect caused by bubbles entering the electronic water pump chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for describing the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0018] Figure 1Schematic diagram of the architecture of a heating system provided by an embodiment of the present application;

[0019] Figure 2 Schematic diagram of the internal coolant flow of an electronic water pump provided by an embodiment of the present application;

[0020] Figure 3 Schematic flowchart of a method for controlling an electronic water pump provided by an embodiment of the present application;

[0021] Figure 4 Schematic diagram of the process of a heating start-up stage proposed by an embodiment of the present application;

[0022] Figure 5 Schematic diagram of the process of a heating shutdown stage proposed by an embodiment of the present application;

[0023] Figure 6 Schematic diagram of the process of a periodic degassing proposed by an embodiment of the present application;

[0024] Figure 7 Schematic diagram of the structure of a control device for an electronic water pump proposed by an embodiment of the present application;

[0025] Figure 8 Schematic diagram of the structure of an electronic device proposed by an embodiment of the present application. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] Overview

[0028] As described in the background art, currently, the heating systems of vehicles, especially new energy vehicles, usually use heaters for heating. Due to the sudden changes in pressure and temperature caused by the start-up, shutdown or loop switching of the coolant circulation pipeline in the heating system, the gas dissolved in the coolant may precipitate or external gas may mix into the coolant, resulting in the generation of bubbles. As the heating system works, the bubbles may enter the chamber of the electronic water pump to produce a gas-liquid effect, causing cavitation or high temperature, resulting in wear of the electronic water pump or even system failure.

[0029] The gas-liquid effect generally refers to the special phenomena generated during the flow, mixing, separation or interaction of gas and liquid due to the differences in physical properties (such as density, solubility, compressibility, etc.) between gas and liquid, such as cavitation, high temperature, etc., which will affect the performance and life of the electronic water pump.

[0030] On this basis, the inventor further found through research that by turning on the electric water pump for a period of time before turning on the heater, the coolant introduced by the electric water pump can fully fill the pipeline, and the gas in the pipeline can be discharged through the high-position exhaust port. After turning off the heater for a period of time and then turning off the electric water pump, the coolant introduced by the electric water pump can take away the residual heat of the heater, avoiding the precipitation of bubbles in the coolant caused by local high temperature. Therefore, in response to a heating start request, the electric water pump is controlled to turn on before the first duration before the heater is turned on. After that, in response to a heating shutdown request, the electric water pump is turned off after the heater is turned off and after a second preset duration, which can fully reduce the generation of bubbles and avoid the gas-liquid effect caused by bubbles entering the electric water pump chamber.

[0031] Based on the above concept, the embodiments of this specification provide an electric water pump control method, which will be described exemplarily below in conjunction with the accompanying drawings.

[0032] Exemplary Scenario

[0033] Reference Figure 1 , Figure 1 is a schematic diagram of the architecture of a feasible application scenario of the electric water pump control method, namely a heating system.

[0034] As Figure 1 shown, the heating system mainly consists of an engine loop and a warm air loop.

[0035] In the engine loop circulation, the engine water pump drives the coolant to flow through the engine, supercharger, thermostat and oil cooler (OC), and then back to the engine water pump. In the warm air loop circulation, the electric water pump drives the coolant to flow through the heater to the heater core (CH), and then back to the electric water pump. Among them, the heater is, for example, a PTC heater.

[0036] The thermostat contains a thermostatic mixing module (TMM), and the TMM is an integrated thermal management component, mainly used to achieve intelligent control of the engine working temperature.

[0037] The switching or interaction between the engine loop circulation and the heating loop circulation is achieved through a four-way valve. When the vehicle is in the pure electric operating condition, the heating of the heating loop is realized by the operation of the heater. In the four-way valve, V3-V4 is connected, and V1-V2 is connected. The engine loop and the heating loop are isolated from each other. The heating loop mainly heats the heater core through the hot coolant flowing through the heater. When the engine starts and the coolant temperature exceeds the preset value, V3-V1 is connected and V4-V2 is connected in the four-way valve. At this time, the engine loop and the heating loop are connected in series. The heating loop mainly heats the heater core through the hot coolant flowing through the engine and the heater, realizing the coupled utilization of energy and achieving the energy-saving effect.

[0038] Among them, the electric water pump is a centrifugal pump, and the energy required for the rotation of the drive shaft that drives the impeller to rotate is provided by the motor of the electric water pump itself. In the electric water pump, the impeller converts the power of the input shaft into the hydraulic power of the coolant flow, sucks the coolant (or coolant) from the central inlet of the shaft, and conveys the pressurized coolant to the outlet of the electric water pump along the radial direction of the blade and along the volute. The coolant enters the heating loop at high speed to form a circulation. In the internal transmission system of the electric water pump, the bearing and the limiting device are used as the core support components, and the transmission stability can be ensured through precise cooperation. When the electric water pump works, the motor drives the active part to rotate at high speed, and the active part drives the passive part to rotate through the bearing. For necessary bearings and limiting devices, the friction between the contact surfaces of the active part (impeller) and the passive part (bearings, etc.) during rotation mainly relies on the coolant for lubrication and heat absorption.

[0039] The flow of the coolant in the electric water pump can be as Figure 2 shown. The coolant enters the electric water pump in the direction of arrow a. After the bubbles enter the chamber of the electric water pump, the gas and the coolant rotate in the direction shown by arrow b to form a vortex, and flow out of the chamber of the electric water pump in the direction of arrow c. Among them, the gas is inside the pump chamber near the center of the drive shaft. The shape of the gas is a three-dimensional cone, with the large mouth of the cone at the pump inlet and the tip of the cone extending inward. The gas area is mostly the position of the bearing and the limiting device.

[0040] Using multiphase (referring to different phases, including at least two of gas, liquid, and solid, mainly referring to gas and liquid here) liquid dynamics to analyze the operation of the electric water pump: When the electric water pump operates, the gas-liquid mixed fluid generates a radial pressure gradient under the action of centrifugal force. The gas with a low density (for example, ρ≈1.2 kg / m 3 ) gathers towards the axis, and the liquid with a high density (for example, ρ≈1030 kg / m 3 ) is thrown to the outer edge, forming as Figure 2The air column shown in the middle conical region covers the bearing part. In this way, lubrication failure or heat accumulation may occur. In the case of lubrication failure, the friction between the bearing and the limiter that originally relied on coolant lubrication becomes dry friction, and the friction coefficient μ increases from a value such as 0.01 during fluid lubrication to a value such as 0.1 - 0.3 during boundary lubrication. In the case of heat accumulation, the bearing friction power consumption can be calculated by P = μ×F×v. The axial load F is, for example, 5N, the rotational speed v is, for example, 5000 rpm, and the bearing friction power consumption P can reach 10 - 30W. Due to the lack of an effective cooling mechanism, the heat generated by friction cannot be dissipated in time, which will cause the bearing temperature to rise sharply, possibly reaching, for example, 10°C / min.

[0041] Perform a critical point analysis of cavitation and flow interruption for the electronic water pump: When the electronic air pump operates, the gas dissolved in the liquid precipitates to form cavitation bubbles. When the cavitation phenomenon gradually intensifies until the area of the electronic water pump inlet covered by the conical opening of the air column exceeds a large part of the inlet area, such as 60%, the actual flow rate Q of the electronic water pump drops sharply to less than 30% of the flow rate design value (maximum value) of the electronic water pump, and the system enters a flow interruption state. At this time, the axial force of the electronic water pump is unbalanced, that is, the pressure difference before and after the impeller disappears, the axial thrust bearing fails, and the axial movement of the rotor is greater than, for example, 0.5 mm, causing mechanical collision and friction failure, and the motor is overloaded, that is, the flow rate decrease of the electronic water pump leads to a decrease in the hydraulic power of the electronic water pump, and the motor load torque suddenly decreases, which may trigger the controller to misjudge congestion and cause current protection. Among them, the hydraulic power can be calculated by W = ρ×g×Q×H, where P is the hydraulic power, ρ is the liquid density, g is the acceleration due to gravity, Q is the actual flow rate of the electronic water pump, H is the height of the electronic water pump, W is the hydraulic power, and the motor load torque T = W / 2πn, where n is the fan rotational speed and T is the motor load torque of the fan.

[0042] That is to say, after the bubbles enter the electronic water pump chamber, due to the different densities of the gas and the liquid,

[0043] their buoyancies are different, and a gas-liquid effect will occur in the electronic water pump chamber. When there is less gas, the electronic water pump cannot be lubricated and cooled during operation, and long-term operation will lead to high-temperature wear failure. When there is more gas, the conical opening of the air column may cover the water pump inlet, making the electronic water pump unable to introduce coolant, and the electronic water pump idles, thus exacerbating high-temperature friction and causing serious faults such as system flow interruption and vehicle overheating.

[0044] Exemplary method

[0045] Please refer to Figure 3 In an exemplary embodiment, a method for controlling an electronic water pump is provided and applied to, for example, Figure 1The shown heating system includes an electronic water pump, a heater, and a heater core. The control method of the electronic water pump is executed by any electronic device in the heating system or by any electronic device outside the heating system that can communicate with the heating system. Specifically, the electronic device can be, for example, a controller that can receive a heating start request and a heating stop request and control each device in the heating system, including sensors, etc., so that the heating system starts, continues, or stops heating. As Figure 3 shown, the control method of the electronic water pump includes steps S301 - S302:

[0046] S301: In response to a heating start request, control the electronic water pump to turn on before the heater is turned on.

[0047] Among them, the heating start request is used to request the heating system to start heating. In addition, the time interval between the turn - on time of the heater and the turn - on time of the electronic water pump is a first preset duration. The turn - on time of the electronic water pump is prior to the turn - on time of the heater.

[0048] That is, the heating system receives the heating start request and, in response to the heating start request, first controls the electronic water pump to turn on, and after passing the first preset duration, controls the heater to turn on. In this way, when the heater is turned on with a delay relative to the electronic water pump, within the delay time of the heater being turned on, the coolant can fully fill the pipeline and discharge the residual gas when initially filling the coolant.

[0049] Exemplarily, the first preset duration can be, for example, 10s.

[0050] S302: In response to a heating stop request, control the electronic water pump to turn off after the heater is turned off and after passing a second preset duration.

[0051] Among them, the heating stop request is used to request the heating system to stop heating. In addition, the time interval between the turn - off time of the heater and the turn - off time of the electronic water pump is a second preset duration. The turn - off time of the heater is prior to the turn - off time of the electronic water pump.

[0052] That is, the heating system receives the heating stop request and, in response to the heating stop request, first controls the heater to turn off, and after passing the second preset duration, controls the electronic water pump to turn off. In this way, when the electronic water pump is turned off with a delay relative to the heater, within the delay time of the electronic water pump being turned off, the coolant flow can maintain the dissipation of residual heat and avoid the generation of bubbles due to a relatively high local temperature of the coolant.

[0053] Exemplarily, the second preset duration can be, for example, 10s.

[0054] In this embodiment, in response to a heating start request, before the first preset duration before the heater is turned on, the electronic water pump is controlled to turn on, and in response to a heating stop request, after the heater is turned off and after a second preset duration, the electronic water pump is controlled to turn off. In this way, turning on the electronic water pump in advance before turning on the heater during heating start can enable the coolant to fully fill the pipeline and discharge the residual gas during coolant filling. When heating stops, delaying the turning off of the electronic water pump after the heater is turned off can dissipate the residual heat of the heater, avoid local high temperature of the coolant from generating bubbles, and thus prevent bubbles from entering the electronic water pump chamber to generate a gas-liquid effect.

[0055] In some embodiments, to reduce bubble generation during heating switching, controlling the electronic water pump to turn on includes: controlling the duty cycle of the electronic water pump to linearly increase from an initial duty cycle to a first target duty cycle; controlling the electronic water pump to turn off includes: controlling the duty cycle of the electronic water pump to linearly decrease until the duty cycle of the electronic water pump decreases to a second target duty cycle.

[0056] Wherein, the first target duty cycle is the duty cycle corresponding to when the output flow rate of the electronic water pump reaches a first target value, and the second duty cycle is the duty cycle corresponding to when the output flow rate reduction value of the electronic water pump reaches a second target value, and the first target value is higher than the second target value.

[0057] The difference between the first target duty cycle and the initial duty cycle is greater than a first preset difference, and the difference between the first target duty cycle and the second target duty cycle is greater than a second preset difference.

[0058] That is to say, the initial duty cycle is a duty cycle much smaller than the first target duty cycle. For example, the initial duty cycle is 0 or a value slightly greater than 0.

[0059] Specifically, the variation law of the duty cycle of the electronic water pump can be determined by, for example, ramp filtering.

[0060] Exemplarily, when the duty cycle of the electronic water pump linearly increases from the initial duty cycle to the first target duty cycle, the duty cycle of the electronic water pump is gradually increased according to ramp filtering. For example, according to a linear rule of increasing by 5% every 100 ms, the duty cycle of the electronic water pump is gradually increased.

[0061] Exemplarily, the first target duty cycle is, for example, 100%.

[0062] Exemplarily, when the duty cycle of the electronic water pump linearly decreases to the second target duty cycle, the duty cycle of the electronic water pump can be gradually decreased according to ramp filtering. For example, according to a linear rule of decreasing by 5% every 100 ms, the duty cycle of the electronic water pump is gradually decreased.

[0063] Exemplarily, the second target duty cycle is, for example, 0.

[0064] It is understandable that there is a corresponding relationship between the duty cycle of the electric water pump and the output flow rate. Specifically, based on the first target value of the output flow rate and in combination with this corresponding relationship, the duty cycle corresponding to the first target value is determined as the first target duty cycle; based on the second target value of the output flow rate and in combination with this corresponding relationship, the duty cycle corresponding to the second target value is determined as the second target duty cycle.

[0065] Exemplarily, taking the PTC heater as an example, the schematic flow diagram of the heating startup stage can be as Figure 4 shown. After receiving the "Heat_ON" request, that is, the heating start request, the electric water pump starts with a duty cycle A (i.e., the initial duty cycle), and the duty cycle of the electric water pump gradually increases to B at a rate of a. After the duty cycle of the electric water pump remains at t1, that is, the first preset duration, the PTC heater is turned on.

[0066] Exemplarily, taking the PTC heater as an example, the schematic flow diagram of the heating shutdown stage can be as Figure 5 shown. After receiving the "Heat_OFF" request, that is, the heating shutdown request, the PTC heater is turned off, and after the second preset duration, that is, the duty cycle of the electric water pump remains at t2 (the second preset duration), the duty cycle of the electric water pump gradually decreases to D at a rate of b.

[0067] In this way, when controlling the electric water pump to start, linearly increasing the duty cycle of the electric water pump can linearly increase the water pump flow rate, avoiding the situation that a large initial flow rate causes water flow impact and generates bubbles when the coolant enters the electric water pump; when controlling the electric water pump to stop, controlling the duty cycle of the electric water pump to linearly decrease to maintain the dissipation of the remaining heat of the heater, avoiding local high temperature of the coolant to generate bubbles, suppressing the generation of bubbles, and avoiding the situation that the duty cycle adjustment during the start and stop of the electric water pump causes water flow impact and even generates secondary bubbles.

[0068] In order to discharge the free bubbles in the system, in some embodiments, after controlling the electric water pump to start, the electric water pump control method further includes: controlling the electric water pump to stop working every third preset duration, and controlling the electric water pump to work after the electric water pump stops working for the fourth preset duration.

[0069] That is, according to the periodic pulse degassing strategy, control the electric water pump to work.

[0070] Specifically, control the electric water pump to start and stop periodically, or rather, control the electric water pump to operate in a fixed cycle. In each cycle, the electric water pump works within the third preset duration and stops working within the fourth preset duration. Among them, each cycle includes the third preset duration and the fourth preset duration. The cycle duration is the sum of the durations of the third preset duration and the fourth preset duration.

[0071] Exemplarily, the electronic water pump is controlled to operate in a cyclic manner with a fixed period of, for example, 5 s. In each period, the electronic water pump is turned on for 60% of the fixed period and turned off for 40% of the fixed period. That is, in each period, the electronic water pump is turned on for 3 s and turned off for 2 s.

[0072] In this way, compared with the continuous operation of the electronic water pump where bubbles are continuously broken up into small particles and it is difficult to aggregate and discharge them through buoyancy, in this embodiment, through the pulse degassing strategy, every third preset time period, the electronic water pump is controlled to stop working, and after the fourth preset time period after the electronic water pump stops working, the electronic water pump is controlled to work, realizing the periodic start and stop of the electronic water pump. When the electronic water pump is in the off stage / stopped working state, the hydrostatic pressure drop and buoyancy effect can be utilized to make the dispersed bubbles aggregate into large bubbles and move towards the highest point of the pump body. When the electronic water pump is in the on stage / working state, the high-speed water flow can be utilized to flush the aggregated bubbles out of the pump body, and the gas is discharged through the high-position exhaust port, so as to effectively promote the aggregation and discharge of the free bubbles in the system.

[0073] In order to ensure the discharge of the free bubbles in the system, in some embodiments, after the electronic water pump is controlled to be turned on, the electronic water pump control method includes: monitoring the current signal of the electronic water pump, and dynamically adjusting the duty cycle within the pulse period of the electronic water pump based on the current signal of the electronic water pump.

[0074] Specifically, the current signal of the electronic water pump is monitored by a sensor.

[0075] The pulse period of the electronic water pump is the period when the electronic water pump is periodically started and stopped as described above. If the change value of the current signal of the electronic water pump within the fifth preset time period is greater than the preset change value, the fourth preset time period is shortened to the sixth preset time period to extend the on time of the electronic water pump and avoid immediately turning off the electronic water pump after it is turned on, which may affect the service life of the electronic water pump; if the value of the current signal of the electronic water pump is greater than the preset current value, the third preset time period is extended to the seventh preset time period to reduce the water flow impact.

[0076] Among them, the time length of the fifth preset time period does not exceed the time length of the third preset time period. Specifically, the time length of the fifth preset time period is the same as or shorter than the time length of the third preset time period.

[0077] In addition, if the value of the current signal of the electronic water pump is greater than the preset current value, it indicates that the pressure of the electronic water pump is too high.

[0078] That is to say, if the change value of the current signal of the electronic water pump within the fifth preset duration is greater than the preset change value, the duty cycle of the sixth preset duration within the pulse period of the electronic water pump is adjusted to 0, and the duty cycle of the time other than the sixth preset duration within the pulse period of the electronic water pump is not 0; if the value of the current signal of the electronic water pump is greater than the preset current value, the duty cycle of the seventh preset duration within the pulse period of the electronic water pump is not 0, and the duty cycle of the time other than the seventh preset duration within the pulse period of the electronic water pump is 0.

[0079] Wherein, when the duty cycle within the pulse period of the electronic water pump is not 0, the duty cycle can be the above-mentioned first target duty cycle or the duty cycle determined based on the actual heating or cooling requirements.

[0080] Exemplarily, as Figure 6 shown, the real-time collected data includes the current signal of the electronic water pump. When performing pulse degassing operation, that is, when controlling the electronic water pump to work according to the periodic pulse degassing strategy, it is judged whether the current is stable or whether the current is not too large, that is, it is judged whether the change value of the current signal of the electronic water pump within the fifth preset duration (such as 5 s) is not greater than the preset change value, or it is judged whether the value of the current signal of the electronic water pump is greater than the preset current value. If so, within each cycle, the opening duration of the electronic water pump is 0.6T (such as 3 s), and the closing duration of the electronic water pump is 0.4T (such as 2 s), where T is the cycle duration (i.e., the fifth preset duration, such as 5 s); if not, within each cycle, the opening duration of the electronic water pump is 0.75T (such as 4.5 s), and the closing duration of the electronic water pump is 0.25T (such as 0.5 s).

[0081] In this way, when the current fluctuates greatly, by shortening the closing duration during the periodic start-stop of the electronic water pump and prolonging the opening duration of the electronic water pump, it can effectively prevent the electronic water pump from being immediately closed after being started, extend the service life of the electronic water pump, ensure the safe use of the electronic water pump, and prolong the opening duration during the periodic start-stop of the electronic water pump when the current value is large, which can effectively reduce the water flow impact, thereby reducing the generation and mixing of bubbles and avoiding the occurrence of the gas-liquid effect.

[0082] In order to ensure the discharge of free bubbles in the system, in some embodiments, after controlling the electronic water pump to start, the working duration of the electronic water pump is monitored, and the electronic water pump is controlled to close only when the working duration of the electronic water pump reaches the preset working duration and a heating shutdown request is received.

[0083] Specifically, monitor the working duration of the electric water pump. If, after the working duration of the electric water pump reaches the preset working duration, a heating shutdown request is received, then perform the operation of, in response to the heating shutdown request, controlling the electric water pump to shut down after the heater is turned off and after a second preset duration; if the working duration of the electric water pump has not reached the preset working duration when a heating shutdown request is received, then control the electric water pump to continue working until the working duration of the electric water pump reaches the preset working duration, and then perform the operation of, in response to the heating shutdown request, controlling the electric water pump to shut down after the heater is turned off and after a second preset duration.

[0084] That is to say, after the electric water pump is controlled to start, no matter when a heating shutdown request is received, force the electric water pump to work until the preset working duration is reached, and then control the heater to turn off and control the electric water pump to turn off after a second preset duration.

[0085] Among them, the working duration of the electric water pump can also be measured by the number of cycles.

[0086] Specifically, by detecting the number of cycles of the periodic start and stop of the electric water pump, monitor the working duration of the electric water pump. If, after the number of cycles of the electric water pump operation reaches the preset number of cycles, a heating shutdown request is received, then control the heater to turn off and control the electric water pump to turn off after a second preset duration; if the number of cycles of the electric water pump operation has not reached the preset number of cycles when a heating shutdown request is received, then control the electric water pump to continue working / operating until the number of cycles of the electric water pump operation reaches the preset number of cycles, and then control the heater to turn off and control the electric water pump to turn off after a second preset duration.

[0087] That is to say, after the electric water pump is controlled to start, no matter when a heating shutdown request is received, force the number of cycles of the electric water pump operation to reach the preset number of cycles, and then control the heater to turn off and control the electric water pump to turn off after a second preset duration.

[0088] In this way, after the electric water pump is controlled to start and after the electric water pump has worked for a certain duration, the electric water pump can be controlled to enter the heating shutdown stage, so as to fully discharge the free bubbles in the system during the working stage of the electric water pump and avoid the occurrence of the gas-liquid effect.

[0089] In order to avoid damage to the electric water pump or even the heating system caused by the high temperature of the coolant, after the electric water pump is controlled to start, monitor the temperature of the coolant, and when the temperature of the coolant is too high, take timely cooling measures.

[0090] Specifically, monitor the temperature of the coolant. If the temperature of the coolant is higher than the preset coolant temperature, then control the electric water pump to continue working, that is, stop the pulse operation, until the temperature of the coolant is lower than the preset coolant temperature.

[0091] Accordingly, if the temperature of the coolant is not higher than the preset coolant temperature, the electronic water pump is not controlled to continuously operate, that is, the electronic water pump is controlled to continue to start and stop periodically.

[0092] Among them, the temperature of the coolant can be monitored by a sensor.

[0093] When it is detected that the temperature of the coolant is higher than the preset coolant temperature, a high-temperature alarm is triggered. This high-temperature alarm is used to prompt relevant personnel that the temperature of the coolant is too high, so that relevant personnel can take corresponding measures in time to avoid losses. The high-temperature alarm can be in the form of sound, light, electricity, and / or text, etc.

[0094] Exemplarily, taking the preset coolant temperature as 105°C as an example, if the temperature of the coolant is higher than 105°C, the electronic water pump is prohibited from performing pulse operation, switched to continuous operation, and a high-temperature alarm is triggered.

[0095] In this way, when the water temperature is relatively high, by switching the pulse working mode of periodically starting and stopping the electronic water pump to the continuous operation working mode, the temperature of the coolant can be reduced as quickly as possible to avoid losses.

[0096] In order to ensure the safety of the electronic water pump and avoid losses, in some embodiments, after the electronic water pump is controlled to start, the temperature of the sealing area of the electronic water pump is monitored, and when the temperature of the sealing area of the electronic water pump is too high, an emergency cooling measure is immediately started.

[0097] Among them, the temperature of the sealing area of the electronic water pump refers to the temperature of the area where the sealing structure for preventing liquid leakage in the electronic water pump is located. The sealing structure in the electronic water pump is usually located at the joint surface between the pump body and the motor, the gap between the rotating shaft and the pump body, the connection of the inlet and outlet flanges, and other interface positions where liquid flow may exist, and is used to isolate the liquid from the external environment or different components to prevent liquid leakage. The sealing method of the sealing structure is, for example, mechanical seal, packing seal, etc.

[0098] Specifically, the temperature of the sealing area of the electronic water pump is monitored. If the temperature of the sealing area of the electronic water pump is higher than the preset sealing area temperature, the electronic water pump is controlled to have a third target duty cycle and continue for an eighth preset duration.

[0099] Accordingly, if the temperature of the sealing area of the electronic water pump is not higher than the preset sealing area temperature, no operation is performed, that is, the electronic water pump is controlled to continue to work according to the original working mode. For example, the original working mode is to start and stop periodically.

[0100] Among them, the temperature of the sealing area of the electronic water pump can be detected by a sensor.

[0101] More specifically, the third target duty cycle is a full duty cycle, that is, the maximum duty cycle of the electronic water pump is 100%.

[0102] Based on different actual requirements, the third target duty cycle can also be a value slightly less than the full duty cycle of 100%, such as 99%.

[0103] Exemplarily, the eighth preset duration can be, for example, 30 s.

[0104] Exemplarily, the preset sealed area temperature can be, for example, 120 °C.

[0105] In this way, when the temperature of the sealed area of the electric water pump is higher than the preset sealed area temperature, the electric water pump is controlled to continuously operate at the full duty cycle for the eighth preset duration, so as to achieve emergency cooling of the sealed area of the electric water pump and avoid damage to the electric water pump or even the heating system caused by high temperature in the sealed area.

[0106] Exemplary Device

[0107] As Figure 7 shown, the embodiment of the present application further provides an electric water pump control device, which is applied to a heating system. The heating system includes an electric water pump, a heater, and a heater core. The electric water pump is used to drive the coolant to flow through the heater and the heater core. The device includes a heating start module 701 and a heating shutdown module 702.

[0108] Among them,

[0109] The heating start module 701 is configured to control the electric water pump to start before the heater is turned on in response to a heating start request, and the time interval between the turn-on time of the heater and the turn-on time of the electric water pump is a first preset duration;

[0110] The heating shutdown module 702 is configured to control the electric water pump to shut down after the heater is turned off and after a second preset duration in response to a heating shutdown request.

[0111] In some embodiments, the heating start module 701 is specifically configured to control the duty cycle of the electric water pump to linearly increase from an initial duty cycle to a first target duty cycle, where the first target duty cycle is the duty cycle corresponding to when the output flow rate of the electric water pump reaches a first target value, and the difference between the first target duty cycle and the initial duty cycle is greater than a first preset difference; the heating shutdown module 702 is specifically configured to control the duty cycle of the electric water pump to linearly decrease until the duty cycle of the electric water pump is reduced to a second target duty cycle, where the second target duty cycle is the duty cycle corresponding to when the output flow rate of the electric water pump is reduced to a second target value, and the difference between the first target duty cycle and the second target duty cycle is greater than a second preset difference.

[0112] In some embodiments, the electronic water pump control device further includes a heating operation module, which is configured to control the electronic water pump to stop working every third preset time period, and control the electronic water pump to work after the fourth preset time period since the electronic water pump stops working.

[0113] In some embodiments, the electronic water pump control device further includes a monitoring module and a heating operation module. The monitoring module is configured to monitor the current signal of the electronic water pump; the heating operation module is configured to, if the change value of the current signal of the electronic water pump within a fifth preset time period is greater than a preset change value, shorten the fourth preset time period to a sixth preset time period, where the time length of the fifth preset time period does not exceed the time length of the third preset time period; if the value of the current signal of the electronic water pump is greater than a preset current value, extend the third preset time period to a seventh preset time period.

[0114] In some embodiments, the electronic water pump control device further includes a monitoring module and a heating operation module. The monitoring module is configured to monitor the working duration of the electronic water pump; the heating operation module is configured to, if the heating shutdown request is received after the working duration of the electronic water pump reaches a preset working duration, perform the operation of controlling the electronic water pump to shut down after the heater is turned off and after a second preset time period in response to the heating shutdown request; if the heating shutdown request is received when the working duration of the electronic water pump does not reach the preset working duration, control the electronic water pump to continue working until the working duration of the electronic water pump reaches the preset working duration, and perform the operation of controlling the electronic water pump to shut down after the heater is turned off and after a second preset time period in response to the heating shutdown request.

[0115] In some embodiments, the electronic water pump control device further includes a monitoring module and a heating operation module. The monitoring module is configured to monitor the temperature of the coolant; the heating operation module is configured to, if the temperature of the coolant is higher than a preset coolant temperature, control the electronic water pump to continuously work until the temperature of the coolant is lower than the preset coolant temperature.

[0116] In some embodiments, the electronic water pump control device further includes a monitoring module and a heating operation module. The monitoring module is configured to monitor the temperature of the sealing area of the electronic water pump, where the sealing area temperature is the temperature of the area where the sealing structure for preventing liquid leakage in the electronic water pump is located; the heating operation module is configured to, if the sealing area temperature of the electronic water pump is higher than a preset sealing area temperature, control the electronic water pump to work at a full duty cycle for an eighth preset time period, where the full duty cycle is the maximum duty cycle of the electronic water pump.

[0117] The electronic water pump control device provided in this embodiment belongs to the same inventive concept as the electronic water pump control method provided in the above embodiments of the present application. It can execute the methods provided in any of the above embodiments of the present application and has the corresponding functional modules and beneficial effects for executing the methods. For technical details not described in detail in this embodiment, reference can be made to the specific processing content of the electronic water pump control method provided in the above embodiments of the present application, which will not be elaborated here.

[0118] The functions implemented by the above heating start module 701 and heating shutdown module 702 can be respectively implemented in the form of software called by the same or different processors. The embodiments of the present application do not make limitations in this regard.

[0119] Exemplary Electronic Device

[0120] Another embodiment of the present application further proposes an electronic device. Refer to Figure 8 As shown, the electronic device includes: a memory 800 and a processor 810.

[0121] Among them, the memory 800 is connected to the processor 810 and is used for storing programs.

[0122] The processor 810 is used to implement the electronic water pump control method disclosed in any of the above embodiments by running the programs stored in the memory 800.

[0123] Specifically, the electronic device may further include: a bus, a communication interface 820, an input device 830, and an output device 840.

[0124] The processor 810, the memory 800, the communication interface 820, the input device 830, and the output device 840 are interconnected through the bus. Among them:

[0125] The bus may include a path for transmitting information between various components of the computer system.

[0126] The processor 810 may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the solution of the present application. It may also be a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0127] The processor 810 may include a main processor, and may also include a baseband chip, a modem, etc.

[0128] The memory 800 stores a program for implementing the technical solution of this application, and may also store an operating system and other key services. Specifically, the program may include program code, and the program code includes computer operation instructions. More specifically, the memory 800 may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk memory, a flash memory, etc.

[0129] The input device 830 may include devices for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a gravity sensor, etc.

[0130] The output device 840 may include devices for allowing information to be output to a user, such as a display screen, a printer, a speaker, etc.

[0131] The communication interface 820 may include devices of any transceiver type for communicating with other devices or communication networks, such as Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.

[0132] The processor 810 executes the program stored in the memory 800 and calls other devices, which can be used to implement each step of any one of the electronic water pump control methods provided in the above embodiments of this application.

[0133] Those skilled in the art can understand that Figure 8 the structure shown in

[0134] is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the electronic device to which the solution of this application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0135] An embodiment of the present application further provides a vehicle, in which the above-mentioned heating system is provided, and the above-mentioned electronic water pump control device or an electronic device that executes the electronic water pump control method is provided in the heating system.

[0136] In addition to the above methods and devices, an embodiment of the present application provides a computer program product, which includes computer program instructions. When the computer program instructions are run by a processor, the processor is caused to execute the steps in the electronic device control method according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0137] The computer program product can be written in any combination of one or more programming languages to write program code for performing the operations of the embodiments of the present application. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed completely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or completely on a remote computing device or server.

[0138] In addition, an embodiment of the present application also provides a storage medium, on which a computer program is stored. The computer program is executed by a processor to execute the steps in the electronic device control method according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0139] The basic principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present invention. In addition, the above-disclosed specific details are only for the purposes of illustration and easy understanding, and are not limitations. The above details do not limit the present invention to necessarily adopt the above specific details to be implemented.

[0140] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

[0141] It should also be noted that in the devices, equipment and methods of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations shall be regarded as equivalent solutions of the present invention.

[0142] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Thus, the present invention is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0143] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present invention are only for more clearly elaborating the technical solutions and cannot be used to limit the protection scope of the present invention.

[0144] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub - combinations thereof.

Claims

1. An electronic water pump control method, characterized in that, Applied to a heating system, the heating system includes an electronic water pump, a heater and a heater core, and the electronic water pump is used to drive the coolant to flow through the heater and the heater core. The method includes: In response to a heating start request, control the electronic water pump to start before the heater starts, and the time interval between the start time of the heater and the start time of the electronic water pump is a first preset duration; In response to a heating stop request, control the electronic water pump to stop after the heater stops and after a second preset duration.

2. The method for controlling an electronic water pump according to claim 1, wherein Controlling the electronic water pump to start includes: Controlling the duty ratio of the electronic water pump to linearly increase from an initial duty ratio to a first target duty ratio, where the first target duty ratio is the duty ratio corresponding to the output flow rate of the electronic water pump reaching a first target value, and the difference between the first target duty ratio and the initial duty ratio is greater than a first preset difference; Controlling the electronic water pump to stop includes: Controlling the duty ratio of the electronic water pump to linearly decrease until the duty ratio of the electronic water pump decreases to a second target duty ratio, where the second target duty ratio is the duty ratio corresponding to the output flow rate of the electronic water pump decreasing to a second target value, and the difference between the first target duty ratio and the second target duty ratio is greater than a second preset difference.

3. The electronic water pump control method according to claim 1, characterized in that After controlling the electronic water pump to start, the method further includes: Every third preset duration, control the electronic water pump to stop working, and control the electronic water pump to work after the electronic water pump stops working for a fourth preset duration.

4. The electronic water pump control method according to claim 3, characterized in that, After controlling the electronic water pump to start, the method further includes: Monitoring the current signal of the electronic water pump; If the change value of the current signal of the electronic water pump within a fifth preset duration is greater than a preset change value, then shorten the fourth preset duration to a sixth preset duration, and the time length of the fifth preset duration does not exceed the time length of the third preset duration; If the value of the current signal of the electronic water pump is greater than a preset current value, then extend the third preset duration to a seventh preset duration.

5. The electronic water pump control method according to claim 1, wherein After controlling the electronic water pump to start, the method further includes: Monitoring the working duration of the electronic water pump; If the heating stop request is received after the working duration of the electronic water pump reaches a preset working duration, then perform the operation of controlling the electronic water pump to stop after the heater stops and after a second preset duration in response to the heating stop request; If the heating stop request is received when the working duration of the electronic water pump has not reached the preset working duration, then control the electronic water pump to continue working until the working duration of the electronic water pump reaches the preset working duration, and perform the operation of controlling the electronic water pump to stop after the heater stops and after a second preset duration in response to the heating stop request.

6. The electronic water pump control method according to claim 1, wherein After controlling the electronic water pump to start, the method further includes: Monitoring the temperature of the coolant; If the temperature of the coolant is higher than the preset coolant temperature, control the electric water pump to continuously operate until the temperature of the coolant is lower than the preset coolant temperature.

7. The electronic water pump control method according to claim 1, characterized in that After controlling the electric water pump to start, the method further includes: Monitoring the temperature of the sealing area of the electric water pump, where the temperature of the sealing area is the temperature of the area where the sealing structure for preventing liquid leakage in the electric water pump is located; If the temperature of the sealing area of the electric water pump is higher than the preset sealing area temperature, control the electric water pump to operate at a full duty cycle for a duration of an eighth preset time, and the full duty cycle is the maximum duty cycle of the electric water pump.

8. An electronic water pump control device, characterized in that, Applied to a heating system, the heating system includes an electric water pump, a heater, and a heater core. The electric water pump is used to drive the coolant to flow through the heater and the heater core. The device includes: A heating start module, configured to, in response to a heating start request, control the electric water pump to start before the heater is turned on, and the time interval between the start time of the heater and the start time of the electric water pump is a first preset time; A heating stop module, configured to, in response to a heating stop request, control the electric water pump to stop after the heater is turned off and after a second preset time has elapsed.

9. An electronic device, characterized in that, Including a memory and a processor; The memory is connected to the processor and is used to store programs; The processor is configured to, by running the programs in the memory, implement the electric water pump control method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, The vehicle is equipped with a heating system, and the heating system is provided with the electric water pump control device according to claim 8, or the electric water pump according to claim 9.

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