A method and device for controlling a charge air cooling water pump of a hybrid vehicle, and a vehicle

Abstract

This invention provides a method, device, and vehicle for controlling the intercooler water pump in a hybrid vehicle. The method includes: determining the actual turbocharger pressure ratio of the vehicle if the ambient pressure is less than a pressure threshold; determining a first target opening degree of the intercooler water pump based on the actual turbocharger pressure ratio and a first mapping file; determining a second target opening degree of the intercooler water pump based on the actual intake manifold temperature and a second mapping file; and determining a third target opening degree of the intercooler water pump based on the first and second target opening degrees. Thus, when the vehicle is traveling in a high-altitude area, the intercooler water pump opening degree is determined simultaneously using a dual control strategy of manifold temperature and boost ratio. Even if the manifold temperature does not reach the control threshold and an effective cooling opening degree is not triggered, the actual boost ratio can accurately identify the heat generated by the high boost pressure at high altitudes, thereby outputting an appropriate water pump opening degree. This completely avoids the problems of cooling failure and high-temperature damage to the bleaching pipe under high-altitude conditions, and can adjust the water pump opening degree as needed to ensure engine performance.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, and in particular to a method, device and vehicle for controlling the intercooled water pump of a hybrid vehicle. Background Technology

[0002] The vehicle engine cooling system mainly includes components such as the engine water jacket, coolant pump, thermostat, main radiator, electric fan, expansion tank, connecting pipes, and temperature sensor. Turbocharged models are also equipped with a turbocharger, intercooler, intercooler water pump, and a plastic degassing pipe connecting the intercooler and expansion tank. When the cooling system is working, the coolant pump drives the coolant to circulate, dissipating heat from the engine through large and small loops. The intercooler water pump independently drives the coolant to flow through the intercooler, cooling the intake air heated by the turbocharger. The degassing pipe is responsible for expelling accumulated air in the cooling circuit to prevent air resistance from affecting circulation and ensuring heat dissipation efficiency.

[0003] In related technologies, the opening of the intercooler pump is generally controlled by the temperature change of the engine intake manifold to stabilize the intake air temperature within the normal range required by the engine, preventing damage to the scavenger pipe due to excessive temperature. However, when the vehicle is driven in high-altitude areas, due to the thin air, the turbocharger needs to significantly increase its opening and speed to compensate for the intake air volume, causing the compressor outlet temperature to rise accordingly. But because the ambient temperature is low, the intake manifold temperature does not trigger the water pump to operate, and the lack of cooling will keep the scavenger pipe at a high temperature for a long time, posing a risk of melting and damage, leading to coolant leakage and affecting engine performance.

[0004] Therefore, there is an urgent need for a control method for intercooled water pumps to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the problems existing in the prior art, embodiments of the present invention provide a method, device, and vehicle for controlling the intercooler water pump of a hybrid vehicle, in order to solve or partially solve the technical problem in the prior art where the opening of the intercooler water pump cannot be accurately controlled when the hybrid vehicle is driving in high-altitude areas, resulting in the risk of the degassing pipe burning out, causing coolant leakage, and thus affecting engine performance.

[0006] A first aspect of the present invention provides a method for controlling an intercooler water pump in a hybrid vehicle, characterized in that the vehicle includes an engine, a turbocharger, and an intercooler water pump, and the method includes: If the ambient pressure of the vehicle's environment is less than a preset pressure threshold, then the actual turbocharger pressure ratio of the vehicle is determined. The first target opening degree of the intercooler water pump is determined based on the actual booster pressure ratio and the pre-calibrated first mapping file. The actual intake manifold temperature of the engine is obtained, and the second target opening degree of the intercooler water pump is determined based on the actual intake manifold temperature and the pre-calibrated second mapping file. The third target opening of the intercooled water pump is determined based on the first target opening and the second target opening, and the intercooled water pump is controlled to operate at the third target opening.

[0007] In the above scheme, the turbocharger includes a compressor; determining the actual turbocharger pressure ratio of the vehicle includes: Obtain the inlet pressure of the compressor and the outlet pressure of the intercooler; The actual turbocharger pressure ratio of the vehicle is determined by the ratio between the inlet pressure of the compressor and the outlet pressure of the intercooler.

[0008] In the above scheme, before determining the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and the pre-calibrated first mapping file, the method further includes: Multiple reference turbocharger pressure ratios are determined based on the actual range of the actual turbocharger pressure ratio. At each altitude, multiple reference turbocharger pressure ratios are iterated. For any current turbocharger pressure ratio that is traversed, multiple intercooler pump openings are determined based on a preset opening step size. At any current intercooler pump opening, the compressor outlet temperature is obtained. If the temperature difference between the compressor outlet temperature and the preset maximum pressure temperature is less than or equal to a preset temperature threshold, then the current intercooler pump opening is determined as the reference intercooler pump opening corresponding to the current reference turbocharger pressure ratio. The pressure ratio of each reference booster and the corresponding opening degree of the reference intercooled water pump at each altitude are calibrated to obtain the first mapping file corresponding to each altitude.

[0009] In the above scheme, the first mapping file stores the correspondence between the booster pressure ratio and the intercooler pump opening degree; determining the first target opening degree of the intercooler pump based on the actual booster pressure ratio and the pre-calibrated first mapping file includes: If the actual turbocharger pressure ratio is in the first mapping file, then based on the actual turbocharger pressure ratio, the corresponding first reference intercooler pump opening is found in the first mapping file, and the first reference intercooler pump opening is determined as the first target opening of the intercooler pump.

[0010] In the above scheme, determining the first target opening degree of the intercooler pump based on the actual booster pressure ratio and the pre-calibrated first mapping file includes: If the actual turbocharger pressure ratio is not in the first mapping file, then search the first adjacent turbocharger pressure ratio, the second adjacent turbocharger pressure ratio, the second reference intercooler pump opening corresponding to the first adjacent turbocharger pressure ratio, and the third reference intercooler pump opening corresponding to the second adjacent turbocharger pressure ratio in the first mapping file. The first target opening of the intercooler pump is determined based on the first adjacent turbocharger pressure ratio, the second adjacent turbocharger pressure ratio, the second reference intercooler pump opening, and the third reference intercooler pump opening.

[0011] In the above scheme, the second mapping file stores the correspondence between the intake manifold temperature and the intercooler pump opening degree; determining the second target opening degree of the intercooler pump based on the actual intake manifold temperature and the pre-calibrated second mapping file includes: If the actual intake manifold temperature is in the second mapping file, then the corresponding second target opening degree of the intercooler pump is found in the second mapping file based on the actual intake manifold temperature.

[0012] In the above scheme, determining the second target opening degree of the intercooler pump based on the actual intake manifold temperature and the pre-calibrated second mapping file includes: If the actual intake manifold temperature is not in the second mapping file, then the first adjacent manifold temperature, the second adjacent manifold temperature, the fourth reference intercooler pump opening corresponding to the first adjacent manifold temperature, and the fifth reference intercooler pump opening corresponding to the second adjacent manifold temperature are searched in the second mapping file. The second target opening of the intercooler pump is determined based on the first adjacent manifold temperature, the second adjacent manifold temperature, the fourth reference intercooler pump opening corresponding to the first adjacent manifold temperature, and the fifth reference intercooler pump opening corresponding to the second adjacent manifold temperature.

[0013] In the above scheme, determining the third target opening degree of the intercooled water pump based on the first target opening degree and the second target opening degree includes: The first target opening degree and the second target opening degree are compared, and the maximum value of the first target opening degree and the second target opening degree is determined as the third target opening degree of the intercooled water pump.

[0014] A second aspect of the present invention provides an intercooler water pump control device for a hybrid vehicle, the vehicle including an engine, a turbocharger, and an intercooler water pump, the device comprising: The first determining unit is used to determine the actual turbocharger pressure ratio of the vehicle if the ambient pressure of the environment where the vehicle is located is less than a preset pressure threshold. The second determining unit is used to determine the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and the pre-calibrated first mapping file. The third determining unit is used to obtain the actual intake manifold temperature of the engine and determine the second target opening degree of the intercooler water pump based on the actual intake manifold temperature and the pre-calibrated second mapping file. The control unit is configured to determine a third target opening of the intercooled water pump based on the first target opening and the second target opening, and control the intercooled water pump to operate at the third target opening.

[0015] A third aspect of the present invention provides a vehicle comprising an engine, a turbocharger and an intercooler pump, a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the program, implements the steps of any of the methods described in the first aspect.

[0016] This invention provides a method, device, and vehicle for controlling an intercooler water pump in a hybrid vehicle. The method includes: determining the actual turbocharger pressure ratio of the vehicle if the ambient pressure of the vehicle's environment is less than a preset pressure threshold; determining a first target opening degree of the intercooler water pump based on the actual turbocharger pressure ratio and a pre-calibrated first mapping file; acquiring the actual intake manifold temperature of the engine; determining a second target opening degree of the intercooler water pump based on the actual intake manifold temperature and a pre-calibrated second mapping file; and determining a third target opening degree of the intercooler water pump based on the first target opening degree and the second target opening degree. The opening degree controls the intercooler water pump to operate at the third target opening degree. Thus, when the vehicle is driving in a high-altitude area, the corresponding intercooler water pump opening degree is determined by using a dual control strategy of manifold temperature and boost ratio. Even if the intake manifold temperature does not reach the control threshold and the effective cooling opening is not triggered, the actual boost ratio can be used to accurately identify the heat generated by the high boost at high altitudes, and then output an appropriate water pump opening degree. This can completely avoid the problems of cooling failure and high temperature damage to the bleach pipe under high-altitude conditions, and can also adjust the water pump opening degree as needed to avoid ineffective high-load operation and premature activation of cooling and heat dissipation, thus ensuring engine performance. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic flowchart of a method for controlling an intercooler water pump in a hybrid vehicle according to an embodiment of the present invention is shown. Figure 2A schematic diagram of the structure of an intercooler water pump control device for a hybrid vehicle according to an embodiment of the present invention is shown. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] To better understand the technical solution of this invention, the cooling system of the vehicle and engine will be introduced first. The vehicle includes an engine and a turbocharger (turbocharger). The turbocharger includes a turbine and a compressor. The turbocharger uses engine exhaust gas to drive the turbine, which coaxially drives the compressor to compress the intake air and increase the intake volume. The vehicle engine cooling system uses coolant as the heat exchange medium and includes heat source components, circulation pipes, heat exchange components, power components, temperature control components, and liquid storage and exhaust components. It mainly includes core components such as the engine water jacket, thermostat, main radiator, electric fan, coolant pump, intercooler, intercooler water pump, expansion tank, vent pipe, various connecting water pipes, and temperature sensors.

[0020] When the engine is running, internal combustion and mechanical friction generate a large amount of heat. The coolant, driven by the water pump, circulates continuously in a closed pipeline. It first flows through the water jacket inside the engine block and cylinder head, fully absorbing the high-temperature heat generated by the engine. Then, the coolant flows out through the pipeline, and the circulation path is automatically switched by the thermostat according to the engine water temperature: when the water temperature is low, the thermostat is closed, and the coolant runs a small loop, only circulating briefly between the engine and the thermostat, allowing the engine to quickly rise to the normal operating temperature; when the water temperature reaches the set threshold, the thermostat is fully open, and the coolant enters the large loop, flowing through the main radiator at the front of the vehicle. With the help of the oncoming wind generated during driving and the forced airflow from the electric fan, the heat is dissipated to the outside air. The cooled coolant is then pumped back to the engine by the water pump, completing the main cooling circuit circulation.

[0021] However, when a vehicle is driven in high-altitude areas, the thin air necessitates a significant increase in the turbocharger's opening and engine speed to compensate for the reduced intake air volume, causing the compressor outlet temperature to rise. Due to the low ambient temperature, the intake manifold temperature does not trigger the water pump to operate, resulting in insufficient cooling. This leaves the sump pipe at a prolonged high temperature, posing a risk of melting and damage, leading to coolant leakage and impacting engine performance.

[0022] Based on this, the present invention provides a method for controlling the intercooler water pump of a hybrid vehicle, such as... Figure 1 As shown, the method mainly includes the following steps: S110, if the ambient pressure of the vehicle's environment is less than a preset pressure threshold, then determine the actual turbocharger pressure ratio of the vehicle.

[0023] Because the ambient pressure differs between low-altitude and high-altitude regions, the control strategy for the intercooler water pump opening also differs. Therefore, it's necessary to first obtain the ambient pressure and determine if it's below a preset pressure threshold. If it is, a dual control strategy using the turbocharger pressure ratio and engine intake manifold temperature is employed to determine the target opening of the intercooler water pump. If the ambient pressure is greater than or equal to the preset pressure threshold, only the engine intake manifold temperature is needed to determine the target opening of the intercooler water pump. The preset pressure threshold can be calibrated based on bench tests; for example, its range could be 90 kPa to 100 kPa.

[0024] Therefore, if the ambient pressure of the vehicle's environment is less than the preset pressure threshold, it indicates that the vehicle is in a high-altitude environment, and it is necessary to determine the actual turbocharger pressure ratio of the vehicle.

[0025] In one embodiment, the turbocharger includes a compressor and a turbine, the compressor and turbine sharing a common shaft and rotating synchronously; determining the actual turbocharger pressure ratio of the vehicle includes: Obtain the compressor inlet pressure and the intercooler outlet pressure; The actual turbocharger pressure ratio of a vehicle is determined by the ratio between the compressor inlet pressure and the intercooler outlet pressure.

[0026] Specifically, engine exhaust gases drive the compressor to compress air. The compressed air experiences a rapid temperature increase, and the high-temperature gas is then sent to the intercooler for cooling. The intercooler water pump drives the coolant circulation, continuously removing heat from the air within the intercooler, thus completing the intake air cooling process.

[0027] Therefore, the actual turbocharger pressure ratio can be determined based on the compressor inlet pressure and the intercooler outlet pressure. Specifically, the actual turbocharger pressure ratio can be determined using formula (1). : (1) In formula (1), The outlet pressure of the intercooler. This is the inlet pressure of the compressor.

[0028] S111, determine the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and the pre-calibrated first mapping file.

[0029] After the actual booster pressure ratio is determined, the first target opening degree of the intercooled water pump can be determined based on the actual booster pressure ratio and the pre-calibrated first mapping file.

[0030] The first mapping file is used to characterize the mapping relationship between the turbocharger pressure ratio and the intercooler pump opening. Before determining the first target opening of the intercooler pump based on the actual turbocharger pressure ratio and the first mapping file, the first mapping file also needs to be calibrated, including: Multiple reference turbocharger pressure ratios are determined based on the actual range of turbocharger pressure ratios; At each altitude, multiple reference turbocharger pressure ratios are iterated. For any current turbocharger pressure ratio that is iterated, multiple intercooler pump openings are determined based on a preset opening step size. At any current intercooler pump opening, the compressor outlet temperature is obtained. If the temperature difference between the compressor outlet temperature and the preset maximum pressure temperature is less than or equal to a preset temperature threshold, then the current intercooler pump opening is determined as the reference intercooler pump opening corresponding to the current reference turbocharger pressure ratio. The pressure ratio of each reference booster and the corresponding opening degree of the reference intercooled water pump at each altitude are calibrated to obtain the first mapping file corresponding to each altitude.

[0031] Specifically, the actual range of the turbocharger pressure ratio can be determined using the following methods: First, the compressor inlet pressure and intercooler outlet pressure are collected under all operating conditions, simultaneously covering scenarios such as plains, plateaus, idling, cruising, acceleration, and full load.

[0032] Then, invalid data due to sensor jumps and exceeding limits are removed to obtain the effective compressor inlet pressure and intercooler outlet pressure. Based on formula (1), the turbocharger pressure ratio corresponding to each operating point is calculated.

[0033] The minimum turbocharger pressure ratio at the operating point is determined as the minimum value of the actual range, and the maximum turbocharger pressure ratio at the operating point is determined as the maximum value of the actual range.

[0034] Then, multiple reference booster pressure ratios are distributed in the actual range according to the preset pressure ratio step size. Since the second mapping file corresponding to different altitudes may be different, all reference booster pressure ratios are traversed at each preset altitude. For any traversed current booster pressure ratio, multiple intercooler pump openings are determined based on the preset opening step size. For example, if the operating range of the intercooler pump is 0~100%, then the openings of the multiple intercooler pumps can be: 0%, 20%, 40%, 60%, 80%, 100%.

[0035] Iterate through the openings of multiple intercooler pumps. For any of the currently iterated intercooler pumps, perform the following operations: Obtain the compressor outlet temperature. If the temperature difference between the compressor outlet temperature and the preset maximum pressure temperature is less than or equal to the preset temperature threshold, it means that the compressor outlet temperature is close to the temperature limit. At this time, the current intercooler water pump opening can be determined as the reference intercooler water pump opening corresponding to the current reference turbocharger pressure ratio.

[0036] After traversing the reference booster pressure ratios at all altitudes, the reference intercooler pump opening corresponding to each reference booster pressure ratio at each altitude can be obtained.

[0037] For each altitude, the pressure ratio of each reference turbocharger and the corresponding opening degree of the reference intercooler pump at that altitude can be calibrated to obtain the first mapping file corresponding to each altitude; the first mapping file stores the correspondence between the turbocharger pressure ratio and the opening degree of the intercooler pump.

[0038] For example, the first mapping file can be a first mapping curve graph, in which the horizontal axis represents the reference booster pressure ratio and the vertical axis represents the reference intercooler pump opening.

[0039] After the first mapping file calibration is completed, in one embodiment, the first target opening degree of the intercooled water pump is determined based on the actual booster pressure ratio and the pre-calibrated first mapping file, including: If the actual turbocharger pressure ratio is in the first mapping file, then the corresponding first reference intercooler pump opening degree is found in the first mapping file based on the actual turbocharger pressure ratio, and the first reference intercooler pump opening degree is determined as the first target opening degree of the intercooler pump.

[0040] In another implementation, determining the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and a pre-calibrated first mapping file includes: If the actual turbocharger pressure ratio is not in the first mapping file, then look up the first adjacent turbocharger pressure ratio, the second adjacent turbocharger pressure ratio, the second reference intercooler pump opening corresponding to the first adjacent turbocharger pressure ratio, and the third reference intercooler pump opening corresponding to the second adjacent turbocharger pressure ratio in the first mapping file. The first target opening of the intercooler pump is determined based on the pressure ratio of the first adjacent turbocharger, the pressure ratio of the second adjacent turbocharger, the opening degree of the second reference intercooler pump, and the opening degree of the third reference intercooler pump.

[0041] For example, suppose the first mapping file stores reference turbocharger pressure ratios A, B, and C; the corresponding reference intercooler pump openings are A1, B1, and C1; if the actual turbocharger pressure ratio is A, the corresponding first reference intercooler pump opening can be found directly in the first mapping file as A1, and then the first target opening is A1.

[0042] If the actual turbocharger pressure ratio is D, and D does not exist in the first mapping file, then find the first adjacent turbocharger pressure ratio A and the second adjacent turbocharger pressure ratio B adjacent to the actual turbocharger pressure ratio D from the first mapping file, as well as the first reference intermediate chilled water pump opening A1 corresponding to the first adjacent turbocharger pressure ratio A and the third reference intermediate chilled water pump opening B1 corresponding to the second adjacent turbocharger pressure ratio B. Determine the first target opening corresponding to the actual turbocharger pressure ratio D according to formula (2). K : (2) This allows the first target opening degree of the intercooler water pump to be determined based on the actual booster pressure ratio.

[0043] S112, obtain the actual intake manifold temperature of the engine, and determine the second target opening degree of the intercooler water pump based on the actual intake manifold temperature and the pre-calibrated second mapping file.

[0044] Under high-altitude operating conditions, the turbocharger pressure ratio can be adjusted in advance based on the compression heat generation intensity to control the intercooler pump opening, achieving pre-cooling control. However, the turbocharger pressure ratio only reflects the theoretical heat generation level and cannot monitor the actual cooling status. When intercooler performance deteriorates, coolant supply is abnormal, ambient temperature fluctuates, or the pressure ratio calibration is incorrect, localized overheating problems can easily occur. Therefore, this invention also incorporates intake manifold temperature into the joint control, which can monitor the actual temperature status of the intake system in real time, compensate for the shortcomings of single turbocharger pressure ratio control, and form a dual protection combining prediction and feedback, effectively avoiding the risk of overheating under high-altitude operating conditions.

[0045] To further improve the control accuracy of the intercooler water pump and fundamentally eliminate the risk of overheating under high-altitude conditions, it is also necessary to obtain the actual intake manifold temperature of the engine and determine the second target opening degree of the intercooler water pump based on the actual intake manifold temperature and the pre-calibrated second mapping file.

[0046] The second mapping file is used to characterize the mapping relationship between the intake manifold temperature and the intercooler pump opening. Before determining the second target opening of the intercooler pump based on the actual intake manifold temperature and the second mapping file, the second mapping file also needs to be calibrated. The specific implementation is as follows: Multiple reference intake manifold temperatures are determined based on the actual operating range of the intake manifold temperature. For example, if the actual operating range of the intake manifold temperature is -20℃ to 120℃, then the multiple reference intake manifold temperatures can be -20℃, 0℃, 20℃, 40℃, 60℃, 80℃, 100℃, and 120℃.

[0047] An initial water pump opening is determined based on empirical values ​​for each reference intake manifold temperature. For example, when the intake manifold temperature is less than or equal to 40 degrees Celsius, the corresponding initial water pump opening is 0; when the intake manifold temperature is greater than 40 degrees Celsius and less than or equal to 60 degrees Celsius, the corresponding initial water pump opening is 20%; when the intake manifold temperature is greater than 60 degrees Celsius and less than or equal to 80 degrees Celsius, the corresponding initial water pump opening is 40%~60%; when the intake manifold temperature is greater than 80 degrees Celsius and less than or equal to 100 degrees Celsius, the corresponding initial water pump opening is 60%; and when the intake manifold temperature is greater than 100 degrees Celsius, the corresponding initial water pump opening is 100%.

[0048] In the bench test, all reference intake manifold temperatures were traversed. For any traversed current intake manifold temperature, the engine started running based on the corresponding initial water pump opening, and the temperature at each measuring point was recorded. The measuring point temperatures included the scavenger pipe wall temperature and the throttle inlet temperature, etc.; the throttle and intercooler outlet were connected.

[0049] If the engine has been in a stable state for a period of time and all the temperatures at the measuring points are normal, it means that the cooling effect has reached the expected level; then the second target opening of the intercooler water pump corresponding to an intake manifold temperature of 40℃ is 0%.

[0050] If the temperature at any measuring point is abnormal after the engine has been in a stable state for a period of time, it indicates that the cooling effect needs to be improved. At this time, the opening of the intercooler water pump can be increased slightly, for example, the opening of the intercooler water pump can be increased to 10%, and the temperature of each measuring point can be collected again. If the temperature of all measuring points is normal, it means that the cooling effect has reached the expected level. Then, the second target opening of the intercooler water pump corresponding to the intake manifold temperature of 40℃ is 10%.

[0051] After operating all reference intake manifold temperatures according to the above method, the second target opening degree of the intercooler pump corresponding to each reference intake manifold temperature can be obtained.

[0052] The second mapping file can be obtained by calibrating all reference intake manifold temperatures and the corresponding second target opening of the intercooler water pump.

[0053] For example, the second mapping file could be a second mapping curve, in which the horizontal axis represents the reference intake manifold temperature and the vertical axis represents the intercooler pump opening.

[0054] After the second mapping file calibration is completed, in one implementation, the second target opening degree of the intercooler pump is determined based on the actual intake manifold temperature and the pre-calibrated second mapping file, including: If the actual intake manifold temperature is in the second mapping file, then the corresponding second target opening degree of the intercooler pump is found in the second mapping file based on the actual intake manifold temperature.

[0055] In another implementation, determining the second target opening degree of the intercooler pump based on the actual intake manifold temperature and a pre-calibrated second mapping file includes: If the actual intake manifold temperature is not in the second mapping file, then look up the first adjacent manifold temperature, the second adjacent manifold temperature, the fourth reference intercooler pump opening corresponding to the first adjacent manifold temperature, and the fifth reference intercooler pump opening corresponding to the second adjacent manifold temperature in the second mapping file. The second target opening of the intercooler pump is determined based on the first adjacent manifold temperature, the second adjacent manifold temperature, the fourth reference intercooler pump opening corresponding to the first adjacent manifold temperature, and the fifth reference intercooler pump opening corresponding to the second adjacent manifold temperature.

[0056] For example, suppose the second mapping file stores reference intake manifold temperatures T1, T2, and T3; the corresponding second target openings are A2, B2, and C2; if the actual intake manifold temperature is T1, the corresponding second target opening is A2, which can be found directly in the second mapping file.

[0057] If the actual intake manifold temperature is T4, and T4 does not exist in the second mapping file, then find the first adjacent reference intake manifold temperature T3 and the second adjacent reference intake manifold temperature T2 adjacent to the actual intake manifold temperature T4 from the second mapping file, as well as the second target opening A2 corresponding to the first adjacent reference intake manifold temperature T3 and the second target opening B2 corresponding to the second adjacent reference intake manifold temperature T2. Determine the second target opening corresponding to the actual intake manifold temperature T4 according to formula (2). K 4: (2) This allows the second target opening degree of the intercooler pump to be determined based on the actual intake manifold temperature.

[0058] S113, determine the third target opening of the intercooled water pump based on the first target opening and the second target opening, and control the intercooled water pump to operate at the third target opening.

[0059] After the first and second target opening degrees are determined, the third target opening degree of the intercooled water pump is determined based on the first and second target opening degrees, and the intercooled water pump is controlled to operate at the third target opening degree.

[0060] In one implementation, determining the third target opening degree of the intercooled water pump based on the first target opening degree and the second target opening degree includes: Compare the first target opening degree and the second target opening degree, and determine the maximum value between the first target opening degree and the second target opening degree as the third target opening degree of the intercooler water pump.

[0061] In other words, the maximum value between the first target opening degree and the second target opening degree is taken to ensure sufficient cooling capacity, effectively avoid the problem of local overheating of the intake system caused by the conservative output of a single control signal, and achieve a balance between cooling safety and operating economy under all high-altitude operating conditions.

[0062] When the vehicle is driving in high-altitude areas, the corresponding intercooler water pump opening is determined by using a dual control strategy of manifold temperature and boost ratio. Even if the intake manifold temperature does not reach the control threshold and the effective cooling opening is not triggered, the actual boost ratio can be used to accurately identify the heat generated by the high boost at high altitudes, and then output an appropriate water pump opening. This can completely avoid the problems of cooling failure and high temperature damage to the bleach pipe under high-altitude conditions, and can also adjust the water pump opening as needed to avoid ineffective high-load operation and premature activation of cooling and heat dissipation, thus ensuring engine performance.

[0063] Based on the same inventive concept as in the foregoing embodiments, this embodiment also provides an intercooling water pump control device for a hybrid vehicle, such as... Figure 2 As shown, the vehicle includes an engine, a turbocharger, and an intercooler water pump, and the device includes: The first determining unit 21 is used to determine the actual turbocharger pressure ratio of the vehicle if the ambient pressure of the environment where the vehicle is located is less than a preset pressure threshold. The second determining unit 22 is used to determine the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and the pre-calibrated first mapping file. The third determining unit 23 is used to obtain the actual intake manifold temperature of the engine and determine the second target opening degree of the intercooler water pump based on the actual intake manifold temperature and the pre-calibrated second mapping file. Control unit 24 is used to determine a third target opening of the intercooled water pump based on the first target opening and the second target opening, and control the intercooled water pump to operate at the third target opening.

[0064] Since the apparatus described in the embodiments of this invention is used for implementing the method of controlling the intercooled water pump of a hybrid vehicle according to the embodiments of this invention, those skilled in the art can understand the specific structure and variations of the apparatus based on the method described in the embodiments of this invention, and therefore will not be described in detail here. All apparatuses used in the methods of the embodiments of this invention fall within the scope of protection of this invention.

[0065] Based on the same inventive concept, this embodiment also provides a vehicle, the vehicle including an engine, a turbocharger and an intercooler water pump, a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the methods described above.

[0066] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages: This invention provides a method, device, and vehicle for controlling an intercooler water pump in a hybrid vehicle. The method includes: determining the actual turbocharger pressure ratio of the vehicle if the ambient pressure of the vehicle's environment is less than a preset pressure threshold; determining a first target opening degree of the intercooler water pump based on the actual turbocharger pressure ratio and a pre-calibrated first mapping file; acquiring the actual intake manifold temperature of the engine; determining a second target opening degree of the intercooler water pump based on the actual intake manifold temperature and a pre-calibrated second mapping file; and determining a third target opening degree of the intercooler water pump based on the first target opening degree and the second target opening degree. The opening degree controls the intercooler water pump to operate at the third target opening degree. Thus, when the vehicle is driving in a high-altitude area, the corresponding intercooler water pump opening degree is determined by using a dual control strategy of manifold temperature and boost ratio. Even if the intake manifold temperature does not reach the control threshold and the effective cooling opening is not triggered, the actual boost ratio can be used to accurately identify the heat generated by the high boost at high altitudes, and then output an appropriate water pump opening degree. This can completely avoid the problems of cooling failure and high temperature damage to the bleach pipe under high-altitude conditions, and can also adjust the water pump opening degree as needed to avoid ineffective high-load operation and premature activation of cooling and heat dissipation, thus ensuring engine performance.

[0067] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of controlling a mid-cooling water pump of a hybrid vehicle, characterized by, The vehicle includes an engine, a turbocharger, and an intercooler water pump, and the method includes: If the ambient pressure of the vehicle's environment is less than a preset pressure threshold, then the actual turbocharger pressure ratio of the vehicle is determined. The first target opening degree of the intercooler water pump is determined based on the actual booster pressure ratio and the pre-calibrated first mapping file. The actual intake manifold temperature of the engine is obtained, and the second target opening degree of the intercooler water pump is determined based on the actual intake manifold temperature and the pre-calibrated second mapping file. The third target opening of the intercooled water pump is determined based on the first target opening and the second target opening, and the intercooled water pump is controlled to operate at the third target opening.

2. The method of claim 1, wherein, The turbocharger includes a compressor; determining the actual turbocharger pressure ratio of the vehicle includes: Obtain the inlet pressure of the compressor and the outlet pressure of the intercooler; The actual turbocharger pressure ratio of the vehicle is determined by the ratio between the inlet pressure of the compressor and the outlet pressure of the intercooler.

3. The method of claim 1, wherein, Before determining the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and the pre-calibrated first mapping file, the method further includes: Multiple reference turbocharger pressure ratios are determined based on the actual range of the actual turbocharger pressure ratio. At each altitude, multiple reference turbocharger pressure ratios are iterated. For any current turbocharger pressure ratio that is traversed, multiple intercooler pump openings are determined based on a preset opening step size. At any current intercooler pump opening, the compressor outlet temperature is obtained. If the temperature difference between the compressor outlet temperature and the preset maximum pressure temperature is less than or equal to a preset temperature threshold, then the current intercooler pump opening is determined as the reference intercooler pump opening corresponding to the current reference turbocharger pressure ratio. The pressure ratio of each reference booster and the corresponding opening degree of the reference intercooled water pump at each altitude are calibrated to obtain the first mapping file corresponding to each altitude.

4. The method of claim 1, wherein, The first mapping file stores the correspondence between the booster pressure ratio and the intercooler pump opening degree; determining the first target opening degree of the intercooler pump based on the actual booster pressure ratio and the pre-calibrated first mapping file includes: If the actual turbocharger pressure ratio is in the first mapping file, then based on the actual turbocharger pressure ratio, the corresponding first reference intercooler pump opening is found in the first mapping file, and the first reference intercooler pump opening is determined as the first target opening of the intercooler pump.

5. The method of claim 4, wherein, Determining the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and the pre-calibrated first mapping file includes: If the actual turbocharger pressure ratio is not in the first mapping file, then search the first adjacent turbocharger pressure ratio, the second adjacent turbocharger pressure ratio, the second reference intercooler pump opening corresponding to the first adjacent turbocharger pressure ratio, and the third reference intercooler pump opening corresponding to the second adjacent turbocharger pressure ratio in the first mapping file. The first target opening of the intercooler pump is determined based on the first adjacent turbocharger pressure ratio, the second adjacent turbocharger pressure ratio, the second reference intercooler pump opening, and the third reference intercooler pump opening.

6. The method of claim 1, wherein, The second mapping file stores the correspondence between intake manifold temperature and intercooler pump opening; determining the second target opening of the intercooler pump based on the actual intake manifold temperature and the pre-calibrated second mapping file includes: If the actual intake manifold temperature is in the second mapping file, then the corresponding second target opening degree of the intercooler pump is found in the second mapping file based on the actual intake manifold temperature.

7. The method of claim 6, wherein, The determination of the second target opening degree of the intercooler pump based on the actual intake manifold temperature and the pre-calibrated second mapping file includes: If the actual intake manifold temperature is not in the second mapping file, then the first adjacent manifold temperature, the second adjacent manifold temperature, the fourth reference intercooler pump opening corresponding to the first adjacent manifold temperature, and the fifth reference intercooler pump opening corresponding to the second adjacent manifold temperature are searched in the second mapping file. The second target opening of the intercooler pump is determined based on the first adjacent manifold temperature, the second adjacent manifold temperature, the fourth reference intercooler pump opening corresponding to the first adjacent manifold temperature, and the fifth reference intercooler pump opening corresponding to the second adjacent manifold temperature.

8. The method of claim 1, wherein, Determining the third target opening degree of the intercooled water pump based on the first target opening degree and the second target opening degree includes: The first target opening degree and the second target opening degree are compared, and the maximum value of the first target opening degree and the second target opening degree is determined as the third target opening degree of the intercooled water pump.

9. A control device for a mid-cooling water pump of a hybrid vehicle, characterized by comprising: The vehicle includes an engine, a turbocharger, and an intercooler water pump; the device includes: The first determining unit is used to determine the actual turbocharger pressure ratio of the vehicle if the ambient pressure of the environment where the vehicle is located is less than a preset pressure threshold. The second determining unit is used to determine the first target opening degree of the intercooled water pump based on the actual booster pressure ratio and the pre-calibrated first mapping file. The third determining unit is used to obtain the actual intake manifold temperature of the engine and determine the second target opening degree of the intercooler water pump based on the actual intake manifold temperature and the pre-calibrated second mapping file. The control unit is configured to determine a third target opening of the intercooled water pump based on the first target opening and the second target opening, and control the intercooled water pump to operate at the third target opening.

10. A vehicle characterized by comprising: The vehicle includes an engine, a turbocharger and an intercooler water pump, a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the program, implements the steps of the method according to any one of claims 1-8.

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