Vehicle control method, control system and vehicle

Abstract

The invention provides a vehicle control method and system and a vehicle. The vehicle comprises an intercooling loop, the intercooling loop comprises a main loop, a bypass branch and a waterway three-way valve, the main loop comprises an intercooler used for reducing the air inlet temperature of an engine, a transmission oil cooler and a second radiator, the waterway three-way valve is provided with an inlet, a first outlet and a second outlet, and the inlet and the first outlet of the waterway three-way valve are connected into the main loop; the second outlet of the waterway three-way valve is connected with one end of the bypass branch, and the second radiator is connected between the other end of the bypass branch and the first outlet of the waterway three-way valve. The method comprises the steps that the actual air inlet temperature of an engine is obtained; and based on the actual air inlet temperature of the engine, the flow of the cooling liquid passing through the second radiator in the intercooling loop is controlled by controlling the waterway three-way valve. The intercooler can be cooled, and the heat dissipation effect of the whole vehicle is improved.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to a vehicle control method, a control system, and a vehicle. Background Art

[0002] With the increasingly strict national regulations on fuel consumption and emissions requirements, as well as the development of the electrification system, hybrid technology is the key to achieving energy conservation and emission reduction. In order to adapt to national policies and meet emission regulations, vehicle manufacturers and component suppliers are both looking for solutions. However, the battery technology of the current pure electric vehicle technology system is complex and the cost is relatively high. Therefore, the hybrid system has been vigorously promoted.

[0003] An intercooler is generally only visible on vehicles equipped with a supercharger. Because the intercooler is actually a supporting component of the turbocharger, its function is to reduce the temperature of the high-temperature air after supercharging, so as to reduce the heat load of the engine, increase the intake air volume, and thus increase the power of the engine. For a supercharged engine, the intercooler is an important component of the supercharging system. Whether it is a mechanically supercharged engine or a turbocharged engine, an intercooler needs to be installed between the supercharger and the intake manifold. The function of the intercooler is to reduce the intake air temperature of the engine. According to the different cooling media, common intercoolers can be divided into two types: air-cooled and water-cooled. How to achieve the cooling of the intercooler is a solution that needs to be proposed at present. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a vehicle control method, a control system, and a vehicle, which can solve the problem of intercooler cooling and improve the overall vehicle heat dissipation effect.

[0005] One aspect of the embodiments of this application provides a vehicle control method. The vehicle includes an intercooling circuit, the intercooling circuit includes a main circuit, a bypass branch, and a water three-way valve. The main circuit includes an intercooler for reducing the intake air temperature of the engine, a transmission oil cooler, and a second radiator. The water three-way valve has an inlet, a first outlet, and a second outlet. The inlet and the first outlet of the water three-way valve are connected in the main circuit. The second outlet of the water three-way valve is connected to one end of the bypass branch. The second radiator is connected between the other end of the bypass branch and the first outlet of the water three-way valve. The method includes: obtaining the actual intake air temperature of the engine; based on the actual intake air temperature of the engine, controlling the flow rate of the coolant in the intercooling circuit passing through the second radiator by controlling the water three-way valve.

[0006] Further, the obtaining of the actual intake air temperature of the engine includes: obtaining the water temperature of the cooled coolant in the intercooling circuit; obtaining the actual intake air temperature of the engine based on the water temperature of the cooled coolant in the intercooling circuit.

[0007] Further, the controlling the flow rate of the coolant in the intercooling circuit through the second radiator by controlling the water three-way valve includes: when the target intake air temperature of the engine is higher than the water temperature of the cooled coolant in the intercooling circuit, reducing the flow rate of the coolant in the intercooling circuit through the second radiator by controlling the water three-way valve; when the target intake air temperature of the engine is lower than the water temperature of the cooled coolant in the intercooling circuit, increasing the flow rate of the coolant in the intercooling circuit through the second radiator by controlling the water three-way valve.

[0008] Further, the vehicle further includes an electric drive circuit, the intercooling circuit is connected in parallel with the electric drive circuit, a first water pump is provided in the electric drive circuit, and a second water pump is provided in the intercooling circuit. The method further includes: obtaining the current flow rate request of the electric drive circuit; controlling the rotation speed of the first water pump based on the current flow rate request of the electric drive circuit; obtaining the current flow rate request of the intercooling circuit; controlling the rotation speed of the second water pump based on the current flow rate request of the intercooling circuit.

[0009] Further, the electric drive circuit includes an external charging controller, a DC-DC controller, an inverter and a first radiator. The obtaining the current flow rate request of the electric drive circuit includes: respectively obtaining the current flow rate requirements of the external charging controller, the DC-DC controller, the inverter and the first radiator; calculating a compensation flow rate based on the current flow rate requirement levels of the DC-DC controller and the external charging controller; taking the maximum of the current flow rate requirements of the external charging controller, the DC-DC controller, the inverter and the first radiator and adding the compensation flow rate to obtain the current flow rate request of the electric drive circuit.

[0010] Further, the obtaining the current flow rate request of the intercooling circuit includes: obtaining the current flow rate requirement of the motor; obtaining the current flow rate requirement of the intercooler; taking the maximum of the current flow rate requirement of the motor and the current flow rate requirement of the intercooler to obtain the current flow rate request of the intercooling circuit.

[0011] Further, obtaining the current flow demand of the intercooler includes: obtaining the feed-forward power of the intercooler according to the heat exchange power of the engine intake air in the intercooler; obtaining the additional heat exchange power through PID calculation according to the difference between the actual intake air temperature and the target intake air temperature of the engine; obtaining the total cooling power of the intercooler based on the feed-forward power and the additional heat exchange power; obtaining the cooling level according to the engine intake air temperature before the intercooling circuit is cooled and the actual coolant water temperature of the intercooling circuit; and obtaining the current flow demand of the intercooler by combining the total cooling power and the cooling level.

[0012] Further, the method further includes: estimating the flow rate of the second water pump at the current speed according to the current speed of the second water pump and the current spool position of the water path three-way valve.

[0013] Further, the vehicle further includes a fan disposed near the first radiator and the second radiator, and the method further includes: obtaining the current ambient temperature; obtaining the coolant water temperature in front of the first radiator; obtaining the coolant water temperature in front of the second radiator; determining the current air volume request level of the electric drive circuit based on the current ambient temperature and the coolant water temperature in front of the first radiator; determining the current air volume request level of the intercooling circuit based on the current ambient temperature and the coolant water temperature in front of the second radiator; obtaining the final air volume request based on the current air volume request level of the electric drive circuit, the current air volume request level of the intercooling circuit, and the vehicle speed; and controlling the fan based on the final air volume request.

[0014] Another aspect of the embodiments of the present application provides a vehicle control system. The vehicle control system includes an intercooling circuit, the intercooling circuit includes a main circuit, a bypass branch, and a water path three-way valve. The main circuit includes an intercooler for reducing the intake air temperature of the engine, a transmission oil cooler, and a second radiator. The water path three-way valve has an inlet, a first outlet, and a second outlet. The inlet and the first outlet of the water path three-way valve are connected in the main circuit. The second outlet of the water path three-way valve is connected to one end of the bypass branch, and the second radiator is connected between the other end of the bypass branch and the first outlet of the water path three-way valve.

[0015] Further, the vehicle control system further includes an electric drive circuit, and the intercooling circuit is connected in parallel with the electric drive circuit.

[0016] Further, the vehicle control system further includes a coolant tank for supplying coolant to both the electric drive circuit and the intercooling circuit.

[0017] Another aspect of the embodiments of the present application provides a vehicle. The vehicle includes the vehicle control system as described above.

[0018] The vehicle control method, control system and vehicle according to one or more embodiments of the present application can cool down the intercooler through the cooling circuit of the transmission oil cooler, and can adjust the flow rate of the coolant passing through the second radiator in the intercooling circuit in real time through a waterway three-way valve according to the actual intake air temperature of the engine, so that the intake air temperature of the engine can be maintained as close as possible to the target intake air temperature of the engine. Thus, the heat dissipation effect of the whole vehicle can be improved by cooling the intercooling circuit, and the engine power can be increased, the engine fuel consumption can be reduced, and air pollution can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a vehicle control system according to an embodiment of the present application.

[0020] Figure 2 It is a flowchart of a vehicle control method according to an embodiment of the present application.

[0021] Figure 3 It is a step of controlling the flow rate of the coolant in the intercooling circuit passing through the second radiator by controlling the waterway three-way valve based on the actual intake air temperature of the engine according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0023] The vehicle control method, control system and vehicle according to each embodiment of the present application will be described in detail below. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0024] Figure 1 Discloses a schematic diagram of a vehicle control system 1 according to an embodiment of the present application. As Figure 1 shown, the vehicle control system 1 according to an embodiment of the present application includes an intercooling circuit 20. The intercooling circuit 20 includes a main circuit 30, a bypass branch 40 and a waterway three-way valve (WCTV, Water Circuit Three way Valve) 50. The main circuit 30 includes an intercooler (WCAC, Water Charge Air Cooler) 31 for reducing the intake air temperature of the engine, a transmission oil cooler (TOC, Transmission Oil Cooler) 32 and a second radiator 34.

[0025] The three-way water valve 50 has an inlet, a first outlet, and a second outlet. The inlet and the first outlet of the three-way water valve 50 are connected in the main circuit 30, and the second outlet of the three-way water valve 50 is connected to one end of the bypass branch 40. The second radiator 34 is connected between the other end of the bypass branch 40 and the first outlet of the three-way water valve 50.

[0026] Through the three-way water valve 50, the coolant flowing through the second radiator 34 can be selectively bypassed or partially bypassed through the bypass branch 40, so that the coolant can pass through the second radiator 34 less or not at all by controlling the three-way water valve 50.

[0027] The vehicle control system 1 of the present application further includes an electric drive circuit 10, wherein the intercooling circuit 20 is connected in parallel with the electric drive circuit 10. The electric drive circuit 10 includes an on-board charger (OBC) 11, a DC-DC controller 12, an inverter (PCM) 13, and a first radiator 14.

[0028] The vehicle control system 1 of the present application further includes a fan disposed close to the first radiator 14 and the second radiator 34.

[0029] A first water pump (EDCP) 15 is provided in the electric drive circuit 10, and a second water pump (CACP) 35 is provided in the intercooling circuit 20.

[0030] In some embodiments, the vehicle control system 1 of the present application further includes a coolant tank (Tank) 70, and the coolant tank 70 can supply coolant to both the electric drive circuit 10 and the intercooling circuit 20.

[0031] In some embodiments, an air separator 16 is further provided in the electric drive circuit 10, and a four-way valve 36 is further provided in the intercooling circuit 20. Two of the ports of the four-way valve 36 are respectively located in the intercooling circuit 20, and the other two ports of the four-way valve 36 are respectively connected to the air separator 16 and the coolant tank 70. The coolant tank 70 can supply coolant to the electric drive circuit 10 and the intercooling circuit 20 respectively through the four-way valve 36. The air separator 16 is connected in the electric drive circuit 10 and can remove bubbles and impurities in the electric drive circuit 10 to ensure efficient circulation of the coolant, thereby improving the efficiency and stability of the entire electric drive circuit 10.

[0032] In some embodiments, the vehicle control system 1 of the present application further includes a third radiator 64. The third radiator 64 is connected to the main cooling system of the engine and can be used to cool the engine.

[0033] The first radiator 14 of the present application is a low-temperature radiator (LT), and the main task of the first radiator 14 is to cool a part of the electric drive circuit 10.

[0034] The second radiator 34 of the present application is a medium-temperature radiator (MT). The main task of the second radiator 34 is to cool the intercooler 31, that is, the part of the second radiator 34 that does not directly participate in the main engine cooling system. For example, the air temperature after the turbocharger will increase due to the compression process. At this time, the intercooler 31 is required to reduce its temperature, and the heat of the intercooler 31 can be dissipated through the second radiator 34.

[0035] The third radiator 64 of the present application is a high-temperature radiator (HT), which is directly connected to the main engine cooling system. The heat generated by the engine during operation is transferred to the high-temperature radiator through the coolant. At the high-temperature radiator, the coolant will release heat to the air through the radiator fins, thereby maintaining the engine temperature within a safe range, preventing the engine from overheating, avoiding thermal damage, and maintaining engine efficiency, etc.

[0036] The first radiator 14, the second radiator 34, and the third radiator 64 are centrally arranged. The fan is arranged closer to the third radiator 64.

[0037] The present application provides a vehicle control method for the above vehicle control system 1. Figure 2 The flowchart of the vehicle control method according to an embodiment of the present application is disclosed. As Figure 2 shown, the vehicle control method according to an embodiment of the present application may include step S1 and step S2.

[0038] In step S1, the actual intake air temperature of the engine is obtained.

[0039] Optionally, obtaining the actual intake air temperature of the engine in step S1 may include step S11 and step S12.

[0040] In step S11, the water temperature of the cooled coolant in the intercooling circuit 20 is obtained.

[0041] In step S12, the actual intake air temperature of the engine is obtained based on the water temperature of the cooled coolant in the intercooling circuit 20. The water temperature of the cooled coolant in the intercooling circuit 20 is approximately equal to the actual intake air temperature of the engine. Therefore, the water temperature of the cooled coolant in the intercooling circuit 20 can be directly used as the actual intake air temperature of the engine.

[0042] In step S2, based on the actual intake air temperature of the engine obtained in step S1, the flow rate of the coolant in the intercooling circuit 20 passing through the second radiator 34 can be controlled by controlling the waterway three-way valve 50.

[0043] Figure 3Disclosed is a step of controlling the flow rate of the coolant in the intercooling circuit 20 passing through the second radiator 34 by controlling the waterway three-way valve 50 based on the actual intake air temperature of the engine in an embodiment of the present application. As Figure 3 shown, in some embodiments, the step of controlling the flow rate of the coolant in the intercooling circuit 20 passing through the second radiator 34 in step S2 may include steps S21 to S24.

[0044] In step S21, the water temperature of the cooled coolant in the intercooling circuit 20 is compared with the target intake air temperature of the engine. When the target intake air temperature of the engine is higher than the water temperature of the cooled coolant in the intercooling circuit 20, the process proceeds to step S22; when the target intake air temperature of the engine is lower than the water temperature of the cooled coolant in the intercooling circuit 20, the process proceeds to step S23; when the target intake air temperature of the engine is equal to the water temperature of the cooled coolant in the intercooling circuit 20, the process proceeds to step S24.

[0045] In step S22, when the target intake air temperature of the engine is higher than the water temperature of the cooled coolant in the intercooling circuit 20, the flow rate of the coolant in the intercooling circuit 20 passing through the second radiator 34 can be reduced by controlling the waterway three-way valve 50, that is, the coolant can be made to partially or fully pass through the bypass branch 40 by controlling the waterway three-way valve 50, so that the coolant passes through the second radiator 34 less or not at all, preventing the water temperature of the coolant from dropping, thereby maintaining the intake air temperature of the engine near the target intake air temperature through the intercooler 31.

[0046] In step S23, when the target intake air temperature of the engine is lower than the water temperature of the cooled coolant in the intercooling circuit 20, the flow rate of the coolant in the intercooling circuit 20 passing through the second radiator 34 can be increased by controlling the waterway three-way valve 50, that is, the coolant can be made to pass through the bypass branch 40 less or not at all by controlling the waterway three-way valve 50, so that the coolant passes through the second radiator 34 more, thereby reducing the water temperature of the coolant, and then reducing the intake air temperature of the engine to near the target intake air temperature through the intercooler 31.

[0047] In step S24, when the target intake air temperature of the engine is equal to the water temperature of the cooled coolant in the intercooling circuit 20, no processing is performed.

[0048] The vehicle control method of the present application can cool the intercooler 31 through the cooling circuit of the transmission oil cooler 32, and can adjust the flow rate of the coolant passing through the second radiator 34 in the intercooling circuit 20 in real time through the waterway three-way valve 50 according to the actual intake air temperature of the engine, so that the intake air temperature of the engine can be maintained as close as possible to the target intake air temperature of the engine. Thus, the heat dissipation effect of the whole vehicle can be improved by cooling the intercooling circuit 20, and the engine power can be increased, the engine fuel consumption can be reduced, and air pollution can be reduced.

[0049] Optionally, a first look-up table of the ambient temperature, the water temperature of the coolant after cooling in the intercooling circuit 20, and the basic position of the valve core of the waterway three-way valve 50 can be pre-calibrated. The basic position of the valve core of the waterway three-way valve 50 can be obtained by referring to the first look-up table or by interpolation calculation of the first look-up table according to the current ambient temperature and the actual water temperature of the coolant after cooling in the intercooling circuit 20. Adding the PI value of the difference between the actual water temperature of the coolant after cooling in the intercooling circuit 20 and the target intake air temperature of the engine, the opening degree of the inlet and the first outlet of the final waterway three-way valve 50 can be obtained. Overall, the higher the ambient temperature and the higher the coolant water temperature, the more the flow rate to the second radiator 34, and the larger the opening degree of the inlet and the first outlet at the valve core position where the waterway three-way valve 50 is located.

[0050] In some embodiments, the vehicle control method of the present application may further include steps S31 to S34.

[0051] In step S31, obtain the current flow request of the electric drive circuit 10.

[0052] The electric drive circuit 10 includes an external charging controller 11, a DC-DC controller 12, an inverter 13, and a first radiator 14. Therefore, obtaining the current flow request of the electric drive circuit 10 in step S31 may further include steps S311 to S314.

[0053] In step S311, obtain the current flow requirements of the external charging controller 11, the DC-DC controller 12, the inverter 13, and the first radiator 14 respectively.

[0054] Optionally, a second look-up table of the temperature of the external charging controller 11, the temperature before heat dissipation of the first radiator 14, and the flow requirement of the external charging controller 11 can be pre-calibrated. The current flow requirement of the external charging controller 11 can be obtained according to the actual temperature of the external charging controller 11 and the actual temperature before heat dissipation of the first radiator 14 and through the second look-up table.

[0055] Optionally, a third look-up table of the temperature of the DC-DC controller 12, the temperature before heat dissipation of the first radiator 14, and the flow rate requirement of the DC-DC controller 12 can be pre-calibrated. The current flow rate requirement of the DC-DC controller 12 can be obtained based on the actual temperature of the DC-DC controller 12, the actual temperature before heat dissipation of the first radiator 14, and through the third look-up table.

[0056] Optionally, a fourth look-up table of the temperature of the inverter 13, the temperature before heat dissipation of the first radiator 14, and the flow rate requirement of the inverter 13 can be pre-calibrated. The current flow rate requirement of the inverter 13 can be obtained based on the actual temperature of the inverter 13, the actual temperature before heat dissipation of the first radiator 14, and through the fourth look-up table.

[0057] In step S312, the compensation flow rate can be calculated based on the current flow rate requirement levels of the DC-DC controller 12 and the external charging controller 11.

[0058] In step S313, the current flow rate requirement of the external charging controller 11 obtained in step S311, the current flow rate requirement of the DC-DC controller 12, the current flow rate requirement of the inverter 13, and the current flow rate requirement of the first radiator 14 are compared to take the maximum value, and then the compensation flow rate obtained in step S312 is added to obtain the current flow rate request of the electric drive loop 10.

[0059] In step S32, the rotation speed of the first water pump 15 can be controlled based on the current flow rate request of the electric drive loop 10 obtained in step S31.

[0060] In step S33, the current flow rate request of the intercooling loop 20 is obtained.

[0061] In some embodiments, obtaining the current flow rate request of the intercooling loop 20 in step S33 may further include steps S331 to S333.

[0062] In step S331, the current flow rate requirement of the motor is obtained.

[0063] In step S332, the current flow rate requirement of the intercooler 31 is obtained.

[0064] Optionally, obtaining the current flow rate requirement of the intercooler 31 in step S332 may further include steps S3321 to S3325.

[0065] In step S3321, the feedforward power of the intercooler 31 is obtained according to the heat exchange power of the engine intake air in the intercooler 31.

[0066] The feedforward power of the intercooler 31 can be obtained according to the following formula:

[0067] Feed - forward power = Engine intake air volume * Coefficient Z * (Engine intake air temperature before inter - cooler cooling

[0068] - Engine intake air temperature after inter - cooler cooling)

[0069] Among them, coefficient Z is related to specific heat capacity.

[0070] Optionally, a fifth look - up table of the engine intake air temperature before the inter - cooler 31 cools and coefficient Z can be pre - calibrated. The current value of coefficient Z can be obtained through the fifth look - up table according to the actual engine intake air temperature before the inter - cooler 31 cools.

[0071] In step S3322, according to the difference between the actual intake air temperature of the engine and the target intake air temperature of the engine, the additional heat exchange power is obtained through PID calculation.

[0072] In step S3323, the total cooling power of the inter - cooler 31 can be obtained based on the feed - forward power obtained in step S3321 and the additional heat exchange power obtained in step S3322.

[0073] In step S3324, the cooling level can be obtained according to the engine intake air temperature before the inter - cooler circuit 20 cools and the actual coolant water temperature of the inter - cooler circuit 20.

[0074] Among them, the higher the engine intake air temperature before the inter - cooler circuit 20 cools and the actual coolant water temperature of the inter - cooler circuit 20, the higher the cooling level.

[0075] In step S3325, the current flow rate demand of the inter - cooler 31 is obtained by combining the total cooling power obtained in step S3323 and the cooling level obtained in step S3324.

[0076] Optionally, a sixth look - up table of the total cooling power, the cooling level and the flow rate demand of the inter - cooler 31 can be pre - calibrated. The current flow rate demand of the inter - cooler 31 can be obtained by referring to the sixth look - up table according to the total cooling power obtained in step S3323 and the cooling level obtained in step S3324.

[0077] In step S333, the current flow rate request of the inter - cooler circuit 20 is obtained by taking the larger value between the current flow rate demand of the motor obtained in step S331 and the current flow rate demand of the inter - cooler 31 obtained in step S332.

[0078] In step S34, the rotation speed of the second water pump 35 can be controlled based on the current flow rate request of the inter - cooler circuit 20 obtained in step S33.

[0079] In some embodiments, the vehicle control method of the present application may further include step S41.

[0080] In step S41, the flow rate of the second water pump 35 at the current speed can be estimated based on the current speed of the second water pump 35 and the current spool position of the water path three-way valve 50.

[0081] Optionally, a seventh look-up table of the speed of the second water pump 35, the spool position of the water path three-way valve 50, and the flow rate of the second water pump 35 can be pre-calibrated. The flow rate of the second water pump 35 at the current speed can be estimated by referring to the seventh look-up table according to the current speed of the second water pump 35 and the current spool position of the water path three-way valve 50.

[0082] In some embodiments, the vehicle control method of the present application may further include steps S51 to S55.

[0083] In step S51, the current ambient temperature is obtained.

[0084] In step S52, the coolant water temperature in front of the first radiator 14 is obtained.

[0085] In step S53, the coolant water temperature in front of the second radiator 34 is obtained.

[0086] In step S54, based on the current ambient temperature obtained in step S51 and the coolant water temperature in front of the first radiator 14 obtained in step S52, the current air volume request level of the electric drive circuit 10 is determined.

[0087] Optionally, an eighth look-up table of the ambient temperature, the coolant water temperature in front of the first radiator 14, and the air volume request level of the electric drive circuit 10 can be pre-calibrated. The current air volume request level of the electric drive circuit 10 can be determined by referring to the eighth look-up table according to the current ambient temperature and the actual coolant water temperature in front of the first radiator 14 obtained in step S52.

[0088] In step S55, based on the current ambient temperature obtained in step S51 and the coolant water temperature in front of the second radiator 34 obtained in step S52, the current air volume request level of the intercooling circuit 20 is determined.

[0089] Optionally, a ninth look-up table of the ambient temperature, the coolant water temperature in front of the second radiator 34, and the air volume request level of the intercooling circuit 20 can be pre-calibrated. The current air volume request level of the intercooling circuit 20 can be determined by referring to the ninth look-up table according to the current ambient temperature and the actual coolant water temperature in front of the second radiator 34 obtained in step S53.

[0090] In step S56, the final air volume request can be obtained based on the current air volume request level of the electric drive circuit 10 determined in step S54, the current air volume request level of the intercooling circuit 20 determined in step S55, and the vehicle speed.

[0091] Optionally, a tenth look-up table of the air volume request level of the electric drive circuit 10, the air volume request level of the intercooling circuit 20, and the vehicle speed and air volume request can be pre-calibrated. The final air volume request can be obtained by referring to the tenth look-up table based on the current air volume request level of the electric drive circuit 10, the current air volume request level of the intercooling circuit 20, and the current vehicle speed.

[0092] In step S57, the fan can be controlled based on the final air volume request obtained in step S56.

[0093] This application provides a vehicle. The vehicle includes the vehicle control system 1 as described above.

[0094] The vehicle control method, control system, and vehicle provided by the embodiments of this application have been introduced in detail above. Specific examples are used in this article to elaborate on the vehicle control method, control system, and vehicle of the embodiments of this application. The description of the above embodiments is only used to help understand the core idea of this application and is not intended to limit this application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the spirit and principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications should also fall within the protection scope of the appended claims of this application.

Claims

1. A vehicle control method, wherein the vehicle comprises an intercooling circuit, the intercooling circuit comprises a main circuit, a bypass branch and a water circuit three-way valve, the main circuit comprises an intercooler for reducing the intake temperature of the engine, a transmission oil cooler and a second radiator, the water circuit three-way valve has an inlet, a first outlet and a second outlet, the inlet and the first outlet of the water circuit three-way valve are connected to the main circuit, the second outlet of the water circuit three-way valve is connected to one end of the bypass branch, and the second radiator is connected between the other end of the bypass branch and the first outlet of the water circuit three-way valve, characterized in that: The method comprises: Get the actual intake air temperature of the engine; Based on the actual intake air temperature of the engine, the flow rate of the coolant in the intercooling circuit passing through the second radiator is controlled by controlling the water circuit three-way valve.

2. The method according to claim 1, characterized in that: The obtaining of the actual intake air temperature of the engine comprises: Obtaining the water temperature of the coolant after cooling in the intercooling circuit; The actual intake air temperature of the engine is obtained based on the cooled coolant water temperature in the intercooler circuit.

3. The method according to claim 2, characterized in that: The controlling of the flow rate of the coolant in the intercooling circuit passing through the second radiator by controlling the water circuit three-way valve comprises: When the target intake air temperature of the engine is higher than the water temperature of the cooled coolant in the intercooling circuit, the flow rate of the coolant in the intercooling circuit passing through the second radiator is reduced by controlling the water circuit three-way valve; When the target intake air temperature of the engine is lower than the water temperature of the cooled coolant in the intercooling circuit, the flow rate of the coolant in the intercooling circuit passing through the second radiator is increased by controlling the water circuit three-way valve.

4. The method according to claim 1, characterized in that: The vehicle further includes an electric drive circuit, the intercooler circuit is connected in parallel with the electric drive circuit, a first water pump is provided in the electric drive circuit, and a second water pump is provided in the intercooler circuit, and the method further includes: Obtaining a current flow request of the electric drive circuit; controlling a rotation speed of the first water pump based on a current flow request of the electric drive circuit; Obtaining a current flow request of the intercooler circuit; The speed of the second water pump is controlled based on a current flow request of the intercooling circuit.

5. The method according to claim 4, characterized in that: The electric drive circuit includes an external charging controller, a DC-DC controller, an inverter and a first heat sink, and the current flow request of the electric drive circuit is obtained including: Respectively obtaining a current flow demand of the external charging controller, a current flow demand of the DC-DC controller, a current flow demand of the inverter, and a current flow demand of the first radiator; calculating a compensation flow rate based on current flow demand levels of the DC-DC controller and the external charging controller; The current flow request of the electric drive circuit is obtained by taking the larger of the current flow demand of the external charging controller, the current flow demand of the DC-DC controller, the current flow demand of the inverter and the current flow demand of the first radiator and adding the compensation flow.

6. The method according to claim 4, characterized in that: The obtaining of the current flow request of the intercooling circuit comprises: Get the current flow demand of the motor; Obtaining a current flow demand of the intercooler; The current flow request of the intercooler circuit is obtained by taking the larger of the current flow demand of the motor and the current flow demand of the intercooler.

7. The method according to claim 6, characterized in that: The obtaining of the current flow demand of the intercooler comprises: Obtaining a feedforward power of the intercooler according to a heat exchange power of the engine intake air in the intercooler; According to the difference between the actual intake temperature of the engine and the target intake temperature, the additional heat exchange power is obtained through PID calculation; Obtaining a total cooling power of the intercooler based on the feedforward power and the additional heat exchange power; Obtaining a cooling level according to an engine intake air temperature before cooling by the intercooling circuit and an actual coolant water temperature of the intercooling circuit; The current flow requirement of the intercooler is obtained by combining the total cooling power and the cooling level.

8. The method according to claim 4, characterized in that: Also includes: The flow rate of the second water pump at the current speed is estimated according to the current speed of the second water pump and the current valve core position of the water three-way valve.

9. The method according to claim 5, characterized in that: The vehicle further includes a fan disposed proximate to the first radiator and the second radiator, and the method further includes: Get the current ambient temperature; Obtaining the water temperature of the coolant before the first radiator; Obtaining the water temperature of the coolant before the second radiator; determining a current air volume request level of the electric drive circuit based on the current ambient temperature and the coolant water temperature before the first radiator; determining a current air volume request level of the intercooling circuit based on the current ambient temperature and the coolant water temperature before the second radiator; obtaining a final air volume request based on a current air volume request level of the electric drive circuit, a current air volume request level of the intercooler circuit, and a vehicle speed; The fan is controlled based on the final air volume request.

10. A vehicle control system, characterized in that: It includes an intercooler circuit, which includes a main circuit, a bypass branch and a water circuit three-way valve. The main circuit includes an intercooler for reducing the intake temperature of the engine, a transmission oil cooler and a second radiator. The water circuit three-way valve has an inlet, a first outlet and a second outlet. The inlet and the first outlet of the water circuit three-way valve are connected to the main circuit, the second outlet of the water circuit three-way valve is connected to one end of the bypass branch, and the second radiator is connected between the other end of the bypass branch and the first outlet of the water circuit three-way valve.

11. The vehicle control system according to claim 10, characterized in that: It also includes an electric drive circuit, and the intercooling circuit is connected in parallel with the electric drive circuit.

12. The vehicle control system according to claim 11, characterized in that: It also includes a coolant tank, which is used to supply coolant to the electric drive circuit and the intercooling circuit at the same time.

13. A vehicle, characterized in that: Comprising a vehicle control system as claimed in any one of claims 10 to 12.

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