Hybrid system based on p1 configuration and electronic water pump control method

Abstract

The application belongs to the technical field of engine electronic control systems, and specifically provides a hybrid power system based on P1 configuration and an electronic water pump control method, the method comprising the following steps: collecting vehicle signals to determine the vehicle state; calculating the target speed of the electronic water pump under different vehicle states; sending the calculated target speed to the water pump controller of the electronic water pump; the water pump controller controls the electronic water pump to switch states according to the received target speed; obtaining the actual speed of the electronic water pump; comparing the actual speed of the electronic water pump with the set target speed; and according to the comparison result, the fault level of the electronic water pump is determined. The electronic water pump speed is set according to the actual needs, and different speed requirements can better adapt to the changing needs of the engine electronic water pump and reduce unnecessary energy loss.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of engine electronic control systems, in particular to a hybrid power system based on a P1 configuration and an electronic water pump control method. BACKGROUND

[0002] Hybrid power and pure electric technology will become the mainstream of future vehicle power. Affected by limited endurance mileage, hybrid power will be the mainstream of energy saving and emission reduction for commercial vehicles in the future.

[0003] The 48V hybrid mode under the new P1 framework can effectively reduce emissions, and through the charging of the power battery to recover part of the energy, the part of the energy can meet the consumption of engine accessories such as electronic water pumps, electronic compressors and the like, improve fuel economy, and has a promising application prospect. The 48V hybrid electronic water pump under the new P1 framework replaces the mechanical water pump of the engine, which has not been applied to high-power commercial vehicle engines. The main reason is that the torque of diesel vehicles is much higher than that of small cars, and the development of 48V electric machines and 48V electronic water pumps with high torque is difficult. However, although this method can effectively reduce energy consumption and improve fuel economy, compared with mechanical fans, on the one hand, the electronic water pump needs to be further tested in terms of vehicle stability, and on the other hand, the electronic water pump is sensitive to temperature, and if the water pump itself is not well cooled, it is easy to cause torque limitation and affect engine cooling.

[0004] Under the 48V hybrid mode of the P1 framework, how to combine the vehicle state and the influencing factors of the engine electronic water pump to control the engine electronic water pump is a technical problem to be solved by the application. SUMMARY

[0005] The application aims to provide a hybrid power system based on a P1 configuration and an electronic water pump control method, which can ensure engine cooling effect and improve vehicle economy.

[0006] In a first aspect, the technical scheme of the application provides a hybrid power system based on a P1 configuration, which comprises a hybrid controller, an engine and a power battery. The engine is connected with an electronic water pump and an electric machine. The output shaft of the engine and the center of the electric machine are coaxial. The electric machine is connected with a clutch. The center of the clutch and the center of the electric machine shaft are coaxial. The clutch is connected with a gearbox. The output shaft of the gearbox is connected with a transmission shaft in a flange mode. The transmission shaft is connected with a retarder and then transmits power to the vehicle bridge tire.

[0007] The electric machine is connected with an electric machine controller. The power battery is connected with the electric machine controller and the electronic water pump through a high-voltage distribution box. The hybrid controller is connected with the electric machine controller and the high-voltage distribution box.

[0008] When the power battery discharges, the current flows to the high-voltage distribution box, the hybrid controller judges that power supply is needed, and controls the high-voltage distribution box switch to be opened to supply power to the motor controller and the electronic water pump respectively; the motor controller converts the direct current output by the high-voltage distribution box into three-phase current to control the motor to operate; when the power battery needs to be charged, the current flows in the opposite direction, and the hybrid controller controls the speed of the electronic water pump according to the state of the whole vehicle.

[0009] As a preferred technical solution of the present application, the motor is fixed by long bolts;

[0010] The transmission output shaft is connected to the transmission shaft by a flange.

[0011] As a preferred technical solution of the present application, the motor and the motor controller are connected by a three-phase cable, and the two ends of the three-phase cable are fixed by copper bolts;

[0012] The motor controller is connected to the high-voltage distribution box by a wire harness, and the two ends of the wire harness are connected by copper bolts.

[0013] The high-voltage distribution box is connected to the power battery by a wire harness, and the high-voltage distribution box is connected to the electronic water pump by a wire harness.

[0014] In a second aspect, the present application also provides an electronic water pump control method based on the P1 configuration of the hybrid power system, wherein the system is the system of the first aspect, and the method comprises the following steps:

[0015] Collecting vehicle signals to determine the state of the whole vehicle;

[0016] Calculating the target speed of the electronic water pump under different vehicle states;

[0017] Sending the calculated target speed to the water pump controller of the electronic water pump;

[0018] The water pump controller controls the electronic water pump to switch states according to the received target speed;

[0019] Obtaining the actual speed of the electronic water pump;

[0020] Comparing the actual speed of the electronic water pump with the set target speed;

[0021] According to the comparison result, the fault level of the electronic water pump is determined.

[0022] As a preferred technical solution of the present application, the step of calculating the target speed of the electronic water pump under different vehicle states comprises:

[0023] When the whole vehicle is in normal mode, the target speed of the electronic water pump is calculated according to the state of the whole vehicle;

[0024] When the whole vehicle is in the regeneration mode, the target rotating speed of the electronic water pump is set according to the regeneration stage.

[0025] As a preferred technical scheme of the present application, when the whole vehicle is in the normal mode, the step of calculating the target rotating speed of the electronic water pump according to the state of the whole vehicle comprises:

[0026] When the state of the whole vehicle is determined to be parking, the target rotating speed of the electronic water pump is set to be zero;

[0027] When the state of the whole vehicle is determined to be starting, the target rotating speed of the electronic water pump is set to be a first speed threshold;

[0028] When the state of the whole vehicle is determined to be driving, the electronic water pump is normally operated, and the target rotating speed of the electronic water pump is calculated.

[0029] As a preferred technical scheme of the present application, when the whole vehicle is in the normal mode, the step of calculating the target rotating speed of the electronic water pump according to the state of the whole vehicle comprises:

[0030] The engine water temperature is obtained;

[0031] The rotating speed of the electronic water pump required by the current engine water temperature is a first rotating speed;

[0032] The rotating speeds of the electronic water pump required by the electronic water pump coordination requirements of the whole vehicle are obtained;

[0033] The maximum rotating speed among the first rotating speed and the rotating speeds of the electronic water pump required by the electronic water pump coordination requirements of the whole vehicle is selected;

[0034] The minimum of the maximum rotating speed and the physical limit rotating speed of the electronic water pump at the current temperature is taken as the target rotating speed of the electronic water pump.

[0035] As a preferred technical scheme of the present application, the step of obtaining the rotating speeds of the electronic water pump required by the electronic water pump coordination requirements of the whole vehicle comprises

[0036] The engine oil temperature is obtained;

[0037] The rotating speed of the electronic water pump required by the current engine oil temperature is a second rotating speed;

[0038] The temperature of the gas after the engine intercooler is obtained;

[0039] The rotating speed of the electronic water pump required by the current gas temperature is a third rotating speed;

[0040] The engine EGR outlet temperature is obtained;

[0041] The rotating speed of the electronic water pump required by the current engine EGR outlet temperature is a fourth rotating speed;

[0042] The throttle depth is obtained;

[0043] The rotation speed of the electronic water pump required to obtain the current throttle depth is a fifth rotation speed;

[0044] The rotation speed of the electronic water pump required according to whether the urea tank has a heating requirement is a sixth rotation speed;

[0045] The rotation speed of the electronic water pump required according to the air conditioning switch state is a seventh rotation speed;

[0046] The rotation speed of the electronic water pump required according to the exhaust brake state is an eighth rotation speed;

[0047] The rotation speed of the electronic water pump required according to the engine rotation speed and the fuel injection state is a ninth rotation speed.

[0048] As a preferred technical solution of the present application, the step of setting the target rotation speed of the electronic water pump according to the regeneration stage includes:

[0049] When the engine rotation speed climbs to a first set value, the vehicle is in a regeneration R1 stage, and the rotation speed of the electronic water pump required in the regeneration R1 stage is obtained;

[0050] The target rotation speed of the electronic water pump is the smaller one between the rotation speed of the electronic water pump required in the regeneration R1 stage and the physical limit rotation speed of the electronic water pump at the current temperature;

[0051] When the engine rotation speed climbs to a second set value, the vehicle is in a regeneration R2 stage, and the rotation speed of the electronic water pump required in the regeneration R2 stage is obtained;

[0052] The target rotation speed of the electronic water pump is the smaller one between the rotation speed of the electronic water pump required in the regeneration R2 stage and the physical limit rotation speed of the electronic water pump at the current temperature;

[0053] When the engine rotation speed climbs to a first set value,

[0054] When the engine aftertreatment HCI injects oil and regenerates carbon particles, the vehicle is in a regeneration R3 stage, and the rotation speed of the electronic water pump required in the regeneration R3 stage is obtained;

[0055] The target rotation speed of the electronic water pump is the smaller one between the rotation speed of the electronic water pump required in the regeneration R3 stage and the physical limit rotation speed of the electronic water pump at the current temperature;

[0056] When the aftertreatment big bag is cooled, the vehicle is in a regeneration R4 stage, and the rotation speed of the electronic water pump required in the regeneration R4 stage is obtained;

[0057] The target rotation speed of the electronic water pump is the smaller one between the rotation speed of the electronic water pump required in the regeneration R4 stage and the physical limit rotation speed of the electronic water pump at the current temperature.

[0058] As a preferred technical solution of the present application, the step of setting the target rotation speed of the electronic water pump according to the regeneration stage includes:

[0059] When the vehicle is in normal mode, the difference between the actual speed of the electronic water pump and the target speed set at present and the ratio of the target speed set at present are calculated;

[0060] When the ratio is less than or equal to the first threshold value, it is reported that the electronic water pump is fault-free.

[0061] When the ratio is greater than the first threshold value and less than or equal to the second threshold value, it is reported that the electronic water pump has a first-level fault.

[0062] When the ratio is greater than the second threshold value, it is reported that the electronic water pump has a second-level fault.

[0063] As a preferred technical solution of the present application, the method further comprises:

[0064] When the electronic water pump is reported to have a second-level fault, the engine torque is controlled to be limited according to the water temperature.

[0065] As can be seen from the above technical solution, the present application has the following advantages: the vehicle platform adopts a P1 configuration 48V coaxial motor scheme, and the coaxial scheme is more compact than the eccentric shaft structure, and the energy transmission loss is reduced. At the same time, the motor, power battery and electronic water pump are all 48V platforms, and the DCDC device voltage conversion is omitted, reducing the energy consumption loss caused by the DCDC device. Part of the recoverable energy generated during vehicle driving can be used for electronic water pump work, further reducing engine fuel consumption and improving economy. The electronic water pump is used to replace the mechanical water pump, and the traditional mechanical water pump is coupled with the engine speed through a belt, and the speed regulation is affected by the engine speed, but the electronic water pump speed is set to different speed requirements according to actual needs, which can better adapt to the changing needs of the engine electronic water pump and reduce unnecessary energy loss.

[0066] In addition, the design principle of the present application is reliable, the structure is simple, and it has very wide application prospect.

[0067] It can be seen that, compared with the prior art, the present application has outstanding substantial characteristics and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0069] Figure 1 is a structure schematic diagram of a hybrid power system based on P1 configuration according to an embodiment of the present application.

[0070] Figure 2 is a schematic flow chart of the method of one embodiment of the present application.

[0071] Figure 3 is a logic diagram for setting the target rotating speed of the electronic water pump in the M2 mode. DETAILED DESCRIPTION

[0072] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0073] As shown in Figure 1 , the embodiment of the present application provides a hybrid system based on P1 configuration, which comprises a hybrid controller, an engine 1, and a power battery 4. The engine 1 is connected with an electronic water pump 3 and a motor 2. The output shaft of the engine 1 and the center of the motor 2 are coaxial. The motor 2 is connected with a clutch 5, the center of which is coaxial with the axis of the motor 2. The clutch 5 is connected with a gearbox 6. The output shaft of the gearbox 6 is connected with a transmission shaft in the form of flange. The transmission shaft is connected with a retarder 7, and then the power is transmitted to the tires of the axle;

[0074] The motor 2 is connected with a motor controller 9. The power battery 4 is connected with the motor controller 9 and the electronic water pump 3 through a high-voltage distribution box 8. The hybrid controller is connected with the motor controller 9 and the high-voltage distribution box 8.

[0075] When the power battery 4 discharges, the current flows to the high-voltage distribution box 8. When the hybrid controller judges that power supply is needed, it controls the high-voltage distribution box switch to be opened to supply power to the motor controller 9 and the electronic water pump 3 respectively. The motor controller 9 converts the direct current output by the high-voltage distribution box into three-phase current to control the motor 2 to operate. When the power battery needs to be charged, the current flows in the opposite direction. The hybrid controller controls the rotating speed of the electronic water pump 3 according to the state of the vehicle. The vehicle platform adopts P1 configuration 48V coaxial motor scheme. Compared with the eccentric structure, the coaxial scheme is more compact, and the energy transmission loss is reduced. At the same time, the motor, the power battery, and the electronic water pump are all 48V platforms, which omits the DCDC device voltage conversion and reduces the energy consumption loss caused by the DCDC device.

[0076] It needs to be explained that the right side of the 48V motor is connected with the motor controller, the high-voltage distribution box, and the power battery, etc. The 75 flat three-phase cable is used to connect between the motor and the motor controller, and the copper bolt is used to fix the cable at both ends. The high-voltage distribution box is connected at the other end of the motor controller, and the current is within 1000A, so the model of the middle cable is a 100 flat wire harness with positive and negative, and the copper nose at both ends of the wire harness is also connected through the copper bolt. The positive and negative 100 flat wire harness is used to connect between the high-voltage distribution box and the power battery. The 25 flat positive and negative wire harness is used to connect between the high-voltage distribution box and the electronic water pump. The charging and discharging process is as follows:

[0077] When the power battery is discharged, at this time, the current flows from the battery simulator to the high-voltage distribution box, and the HCU judges whether the high-voltage distribution box judges to supply power to the electronic water pump and the 48V motor. When power supply is needed, the high-voltage distribution box will open the switch current to flow to the motor controller and the electronic water pump respectively. The motor controller converts the received direct current into three-phase current to control the motor to operate. When the power battery needs to be charged, the current flows in the opposite direction.

[0078] In front of the engine, there is an electronic water pump, which replaces the original mechanical water pump position, and is fixed by bolts. The original flywheel shell is removed at the rear of the engine, and is replaced by a 48V motor with a flywheel shell, which is fixed by long bolts. The length of the flywheel shell is increased by 110mm, and the output shaft of the engine and the center of the motor are coaxial, which ensures compact structure. The clutch is connected behind the 48V motor, and the center of the clutch is also coaxial with the center of the 48V motor shaft. The transmission box is connected behind the clutch, and the output shaft of the transmission box is connected to the transmission shaft through the flange. The differential is connected behind the transmission shaft, and then the power is transmitted to the axle tires, etc.

[0079] As shown in Figure 2 The embodiment of the present application provides a hybrid power system electronic water pump control method based on P1 configuration, the system is the system described in the above embodiment, and the method comprises the following steps:

[0080] Step 1: Collecting vehicle signals to judge the vehicle state;

[0081] Step 2: Calculating the target speed of the electronic water pump under different vehicle states;

[0082] Step 3: Sending the calculated target speed to the water pump controller of the electronic water pump;

[0083] Step 4: The water pump controller controls the electronic water pump to switch according to the received target speed;

[0084] Step 5: Obtaining the actual speed of the electronic water pump;

[0085] Step 6: Compare the actual speed of the electronic water pump with the set target speed;

[0086] Step 7: Determine the fault level of the electronic water pump according to the comparison result.

[0087] The appropriate target setting speed of the electronic water pump is given for different operating conditions of the vehicle and the engine. The electronic water pump is controlled through CAN communication, and the related parameters of the electronic water pump such as the water pump stator temperature, the current actual speed of the water pump are monitored. By setting the speed and the actual speed, two levels of fault levels are set according to the deviation. It is further pointed out that the steps of calculating the target speed of the electronic water pump under different vehicle states include:

[0088] When the vehicle is in normal mode, the target speed of the electronic water pump is calculated according to the vehicle state;

[0089] When the vehicle is in regenerative mode, the target speed of the electronic water pump is set according to the regenerative stage. The engine operating state includes five cases: (0) standby state, (1) key-on but not started, (2) engine start, (3) engine running state, (4) engine stop state, and (5) engine stop and power-off state. The engine ECU sends CAN messages (vehicle speed signal and engine operating state) to the hybrid controller HCU.

[0090] In the HCU, the vehicle operating condition is determined according to the vehicle speed and the engine operating state, such as vehicle speed VehV_V = 0 km / h and engine operating state CoEng_st = 0 / 1 / 4 / 5, then the vehicle is in parking state M0; when VehV_V = 0 km / h and CoEng_st = 2 (COENG_RUNNING, i.e. engine running), the vehicle is in start state M1, and when vehicle speed VehV_V is not equal to 0 km / h and CoEng_st = 3, the vehicle is in M2 driving state.

[0091] The vehicle start-stop and driving modes M0 / M1 / M2 all belong to the vehicle Normal mode. When the vehicle starts the parking regenerative start button, the vehicle and the engine will enter the parking regenerative mode Rgn.

[0092] When the vehicle is in normal mode, the target speed of the electronic water pump is calculated according to the vehicle state, which includes the following steps:

[0093] When the vehicle is in parking state, the target speed of the electronic water pump is set to zero; M0 stage: vehicle parking state, electronic water pump not started (Off), at this time the speed of the electronic water pump is WaPmp_nEngM1 = 0 (r / min);

[0094] When judging the whole vehicle starting state, the target rotating speed of the electronic water pump is set as the first speed threshold; M1 stage: whole vehicle starting state, electronic water pump starting, running at low speed (Low), so as to rapidly warm up and reduce the wear of the engine. At this time, the rotating speed of the electronic water pump can be set as WaPmp_nEngM1=500 (r / min) ;

[0095] As shown in the figure, when judging the whole vehicle running state, the electronic water pump normally runs, and the target rotating speed of the electronic water pump is calculated. Specifically, it includes: Figure 3

[0096] Obtaining the engine water temperature; and then obtaining the rotating speed of the electronic water pump required by the current engine water temperature as the first rotating speed;

[0097] The engine water temperature required water pump rotating speed WaPmp_nEngTemp1 can be calculated according to the water temperature and water pump rotating speed corresponding table WaPmp_nEngTemp1_CUR. The water temperature and water pump rotating speed corresponding table is shown in Table 1. The specific implementation steps are as follows: Wherein EngTemp1 is the engine water temperature, which can be sent from the engine controller ECU to the hybrid controller HCU through CAN message, and then the HCU calculates the required water pump rotating speed WaPmp_nEngTemp1 through internal table lookup. This value can be sent from the HCU to the electronic water pump MCU through the CAN message format, and the electronic water pump will execute according to the instruction.

[0098] Table 1

[0099] EngTemp1 (°C) 0 20 40 60 80 100 120 WaPmp_nEngTemp1 (r / min) 500 1000 1500 2000 2500 3000 3500

[0100] Obtaining the engine oil temperature; obtaining the rotating speed of the electronic water pump required by the current engine oil temperature as the second rotating speed; the engine oil temperature required water pump rotating speed WaPmp_nEngTemp2, wherein EngTemp2 is the oil temperature, which is calculated according to the oil temperature and water pump rotating speed corresponding table WaPmp_nEngTemp2_CUR. The oil temperature and water pump rotating speed corresponding table is shown in Table 2.

[0101] Table 2

[0102] EngTemp2 (°C) 0 20 40 60 80 100 120 WaPmp_nEngTemp2 (r / min) 700 1200 1700 2200 2700 3200 3700

[0103] Obtaining the engine after-intercooling gas temperature; obtaining the rotating speed of the electronic water pump required by the current gas temperature as the third rotating speed;

[0104] The engine after-intercooling gas temperature required water pump rotating speed WaPmp_nAirTemp1, wherein AirTemp is the after-intercooling gas temperature, which is calculated according to the gas temperature and water pump rotating speed corresponding table WaPmp_nAirTemp1_CUR. The gas temperature and water pump rotating speed corresponding table is shown in Table 3. ​

[0105] Table 3

[0106] AirTemp (%) 0 20 40 60 80 100 120 WaPmp_nAirTemp1 (r / min) 500 1000 1500 2000 2500 3000 3500

[0107] The engine EGR outlet temperature is obtained; the electronic water pump speed required for obtaining the current engine EGR outlet temperature is the fourth speed;

[0108] The engine EGR outlet temperature demand water pump speed WaPmp_nTEGR is calculated according to the EGR temperature and water pump speed corresponding table WaPmp_nTEGR_CUR, which can be calibrated, and the EGR temperature and water pump speed corresponding table is shown in Table 4; wherein EGRTemp is the EGR outlet temperature.

[0109] Table 4

[0110] EGRTemp (°C) 0 20 40 60 80 100 120 WaPmp_nTEGR (r / min) 500 1000 1500 2000 2500 3000 3500

[0111] The throttle depth is obtained; the electronic water pump speed required for obtaining the current throttle depth is the fifth speed;

[0112] The throttle depth demand water pump speed WaPmp_nAppDmd is calculated according to the throttle depth and water pump speed corresponding table WaPmp_nAppDmd_CUR, which can be calibrated, and the throttle depth and water pump speed corresponding table is shown in Table 5, wherein App_r is the throttle depth.

[0113] Table 5

[0114]

[0115] The electronic water pump speed required according to whether the urea tank has heating demand is the sixth speed; the urea tank heating demand water pump speed WaPmp_nUHtrTnk is selected according to UHtrTnk_st WaPmp_nUHtrTnkOff_C or WaPmp_nUHtrTnkOn_C, which can be calibrated.

[0116] Specifically, when the engine is in the urea tank non-heating state, WaPmp_nUHtrTnk=0 at this time, and the state quantity is set through the CAN message format and sent from the ECU to the HCU. The electronic water pump speed demand is WaPmp_nUHtrTnkOff_C=0 in the heating state, and when WaPmp_nUHtrTnk=1, the electronic water pump speed is WaPmp_nUHtrTnkOn_C=3400(r / min).

[0117] The electronic water pump speed required according to the air conditioning switch state is the seventh speed; the air conditioning switch state ACSwt_stAct change demand water pump speed WaPmp_nACSwt can be calibrated, and specifically as follows:

[0118] When the vehicle air conditioning switch is closed, the engine ECU can monitor the current air conditioning switch state ACSwt_stAct = 1, at this time, the electronic water pump demand speed WaPmp_nACSwt = 3500 (r / min); when ACSwt_stAct = 0, at this time, no air conditioning is not turned on, the electronic water pump demand speed WaPmp_nACSwt = 0 (r / min).

[0119] According to the exhaust brake state, the corresponding required electronic water pump speed is the eighth speed;

[0120] The exhaust brake state demand water pump speed WaPmp_nEngBrk can be calibrated, and the specific calculation is as follows. When the exhaust brake switch is closed, EngBrk_stExhFlpDem = 0; At this time, the electronic water pump demand speed is 0 (r / min), when the exhaust brake switch is opened EngBrk_stExhFlpDem = 1; At this time, the electronic water pump speed can change with the change of engine speed, which can be given by the engine speed and water pump speed corresponding table. The engine speed and water pump speed corresponding table is shown in Table 6;

[0121] Table 6

[0122]

[0123] According to the engine speed and injection state, the corresponding required electronic water pump speed is the ninth speed. The engine speed and injection state demand water pump WaPmp_nEngDmd can be calibrated. The engine speed and injection state required pump speed corresponding table is shown in Table 7; Where x is the engine speed (r / min), y is the injection amount (mg / hug) (injection amount per stroke), and the middle table value is the electronic water pump demand speed WaPmp_nEngDmd (r / min).

[0124] Table 7

[0125] y\x 0 500 1000 1500 2000 2500 3000 3500 4000 4500 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 2 0 500 1000 1500 2000 2500 3000 3500 4000 4500 4 0 500 1000 1500 2000 2500 3000 3500 4000 4500 6 0 500 1000 1500 2000 2500 3000 3500 4000 4500 8 0 500 1000 1500 2000 2500 3000 3500 4000 4500 10 0 500 1000 1500 2000 2500 3000 3500 4000 4500 12 0 500 1000 1500 2000 2500 3000 3500 4000 4500 14 0 500 1000 1500 2000 2500 3000 3500 4000 4500

[0126] Obtain the electronic water pump cooperative vehicle demand required electronic water pump speed;

[0127] Select the maximum speed of the first speed and the electronic water pump cooperative vehicle demand required electronic water pump speed;

[0128] The maximum speed and the electronic water pump physical limit speed at the current temperature are taken as the target speed of the electronic water pump.

[0129] The electronic water pump demand speed calibration ends, and different input electronic water pump speeds are coordinated and limited. The maximum value of the above nine input demand speeds is taken, and the electronic water pump speed limit (physical limit) at the current temperature is taken to calculate the final electronic water pump target speed WaPmp_nEngDmd_Nromal.

[0130] When the vehicle is in the regeneration state, the combustible aftertreatment large bag area carbon can be burned, and the engine exhaust is smooth. At this time, the electronic water pump control mode will also enter the Rgn mode (the specific steps are that the vehicle presses the parking regeneration button, and the engine will automatically judge whether it can enter the parking regeneration according to the carbon amount, clutch, water temperature and other ten conditions. When entering, the state observation quantity of entering the parking regeneration will be given. The state observation quantity information can be sent from the ECU to the HCU through the CAN message). The electronic water pump speed will be set to different water pump speeds WaPmp_nRgnX according to different stages of parking regeneration. The steps of setting the target speed of the electronic water pump according to the regeneration stage include:

[0131] When the vehicle is in the regeneration mode, the engine speed climbs to the first set value, and is in the regeneration R1 stage. The electronic water pump speed required in the regeneration R1 stage is obtained. In the regeneration stage R1, the engine speed climbs to 1200r / min, the exhaust emission temperature rises to 200℃, and the electronic water pump target speed is WaPmp_nRgn1=1400r / min.

[0132] The electronic water pump speed required in the regeneration R1 stage is taken as the target speed of the electronic water pump by taking the minimum value of the electronic water pump physical limit speed at the current temperature. In the regeneration stage R2, the engine speed is raised to 1500r / min, the exhaust emission temperature is raised to 300℃, and the electronic water pump target speed WaPmp_nRgn2=1700r / min.

[0133] When the engine speed climbs to the second set value, it is in the regeneration R2 stage, and the electronic water pump speed required in the regeneration R2 stage is obtained. In the regeneration stage R3, the engine speed is further increased to 1700r / min, and the engine aftertreatment HCI sprays oil to burn the exhaust pipe. The temperature of the burned exhaust gas can be above 400℃. At this time, the aftertreatment will chemically react with the carbon particles, and the regeneration starts. The carbon particles are converted into carbon dioxide. In this stage, the electronic water pump target speed is WaPmp_nRgn3=2000r / min.

[0134] In the regeneration stage R4, after the regeneration is completed, the carbon amount is removed. At this time, the electronic water pump target speed WaPmp_nRgn4=2000r / min is set for the aftertreatment large bag to cool for ten minutes.

[0135] The appropriate water pump target setting speed is given for different operating conditions of the vehicle and the engine, the electronic water pump is controlled through CAN communication, and the related parameters of the electronic water pump are monitored, such as the water pump stator and rotor temperature, and the current actual speed of the water pump. By comparing the set speed and the actual speed, two levels of fault are set according to the deviation level. The specific steps are as follows:

[0136] When the vehicle is in normal mode, the difference between the current actual speed of the electronic water pump and the target speed set at present and the ratio of the target speed set at present are calculated;

[0137] When the ratio is less than or equal to the first threshold value, the electronic water pump is reported to be fault-free;

[0138] When the ratio is greater than the first threshold value and less than or equal to the second threshold value, the electronic water pump is reported to have a first level fault;

[0139] When the ratio is greater than the second threshold value, the electronic water pump is reported to have a second level fault.

[0140] When |(Wapmp_nAct-WaPmp_nDem_Normal)| / WaPmp_nDem_Normal≤5%, it is in the reasonable speed stage, and the fault-free Wapmp_Eor_lv=0.

[0141] When 5%<|(Wapmp_nAct-WaPmp_nDem_Normal)| / WaPmp_nDem_Normal≤10%, a first level fault is reported Wapmp_Eor_lv=1.

[0142] When |(Wapmp_nAct-WaPmp_nDem_Normal)| / WaPmp_nDem_Normal>10%, a second level fault is reported Wapmp_Eor_lv=2.

[0143] Where Wapmp_nAct is the current actual operating speed of the engine electronic water pump.

[0144] LEVEL1: This level of fault only indicates that the water pump speed deviation is small, which needs attention, but this fault will not affect the use. The water pump controller will not limit the motor torque or power because of this. After the fault disappears, the hybrid controller can reduce the fault level to Wapmp_Eor_lv=0.

[0145] LEVEL2: This level of fault indicates that the motor speed deviates greatly from the set speed, and the torque or power needs to be reduced according to the situation, and the engine torque is limited according to the water temperature to prevent the engine from overheating. After the fault disappears, the hybrid controller can reduce the fault level to Wapmp_Eor_lv=0.

[0146] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Various equivalent modifications or changes in the application can be made all of which fall within the scope of the present application. Any modifications or changes in the application should be construed as falling within the scope of the present application. The scope of the application should be determined by the appended claims.

Claims

1. A method for controlling an electronic water pump in a hybrid power system based on a P1 configuration, characterized in that, The hybrid system includes a hybrid controller, an engine, and a power battery. The engine is connected to an electric water pump and a motor. The engine's output shaft and the motor's center are coaxial. The motor is connected to a clutch, the clutch's center being coaxial with the motor's shaft. The clutch is connected to a gearbox. The gearbox's output shaft is connected to a drive shaft via a flange. The drive shaft is connected to a retarder, which then transmits power to the axle tires. The motor is connected to a motor controller. The power battery is connected to both the motor controller and the electric water pump via a high-voltage distribution box. The hybrid controller is connected to both the motor controller and the high-voltage distribution box. When the power battery discharges, current flows to the high-voltage distribution box. When the hybrid controller determines that power is needed, it opens the high-voltage distribution box switch to supply power to both the motor controller and the electric water pump. The motor controller converts the received DC power from the high-voltage distribution box into three-phase current to control the motor's operation. When the power battery needs charging, the current flows in the opposite direction. The hybrid controller controls the electric water pump's speed according to the vehicle's overall status. The method includes the following steps: Collect vehicle signals to determine the vehicle's status; Calculate the target speed of the electronic water pump under different vehicle conditions; The calculated target rotational speed is sent to the pump controller of the electronic water pump; The water pump controller controls the electronic water pump to switch states according to the received target speed. Obtain the actual rotational speed of the electronic water pump; Compare the actual speed of the electronic water pump with the set target speed; The fault level of the electronic water pump is determined based on the comparison results; The steps for calculating the target speed of the electric water pump under different vehicle conditions include: When the vehicle is in normal mode, the target speed of the electronic water pump is calculated based on the vehicle status; specifically, when the vehicle is parked, the target speed of the electronic water pump is set to zero. When determining the starting status of the vehicle, the target speed of the electronic water pump is set as the first speed threshold. When judging the overall vehicle driving status, the electronic water pump is operating normally, and the target speed of the electronic water pump is calculated. When the vehicle is in regeneration mode, the target speed of the electronic water pump is set according to the current regeneration stage.

2. The electronic water pump control method for a hybrid power system based on a P1 configuration according to claim 1, characterized in that, When an electric water pump is operating normally, the steps for calculating the target speed of the electric water pump include: Get the engine coolant temperature; The speed of the electronic water pump required to obtain the current engine coolant temperature is the first speed; Obtain the speeds of the electronic water pump required to coordinate the needs of the entire vehicle; Select the maximum speed among all speeds of the electronic water pump required to coordinate the overall vehicle needs, including the first speed; The target speed of the electronic water pump is the smaller of the maximum speed and the physical limit speed of the electronic water pump at the current temperature.

3. The electronic water pump control method for a hybrid power system based on a P1 configuration according to claim 2, characterized in that, The steps for obtaining the required speeds of the electric water pump to coordinate with the vehicle's overall needs include: Obtain engine oil temperature; The second speed is the electronic water pump speed required to obtain the current engine oil temperature; Obtain the temperature of the gas after the engine intercooler; The speed of the electronic water pump required to obtain the current gas temperature is the third speed. Obtain the engine EGR outlet temperature; The speed of the electric water pump required to obtain the current engine EGR outlet temperature is the fourth speed. Get the throttle depth; The electronic water pump speed required to obtain the current throttle depth is the fifth speed. The required speed of the electronic water pump is determined based on whether the urea tank requires heating; the sixth speed is specified. The required speed of the electronic water pump is determined based on the air conditioner's on / off status; the speed is the seventh speed. The required speed of the electronic water pump is determined based on the exhaust braking status, which is the eighth speed. The required speed of the electronic water pump, determined based on the engine speed and fuel injection status, is the ninth speed.

4. The electronic water pump control method for a hybrid power system based on a P1 configuration according to claim 3, characterized in that, The steps for setting the target speed of the electric water pump according to the current regeneration stage include: When the vehicle is in regeneration mode, the engine speed climbs to the first set value speed and enters the regeneration R1 stage, obtaining the speed of the electric water pump required for the regeneration R1 stage; The target speed of the electronic water pump is the smaller of the speed required for the regeneration R1 stage and the physical limit speed of the electronic water pump at the current temperature. When the engine speed climbs to the second set value speed, it is in the regeneration R2 stage, and the speed of the electric water pump required for the regeneration R2 stage is obtained; The target speed of the electronic water pump is the smaller of the speed required for the regeneration R2 stage and the physical limit speed of the electronic water pump at the current temperature. When the engine speed climbs to the first set speed... When the engine aftertreatment HCI fuel injection regenerates carbon particles, it is in the regeneration R3 stage. The speed of the electric water pump required for the regeneration R3 stage is obtained. The target speed of the electronic water pump is the smaller of the speed required for the regeneration R3 stage and the physical limit speed of the electronic water pump at the current temperature. When cooling the post-processing bulk pack, it is in the regeneration R4 stage. The required speed of the electric water pump for the regeneration R4 stage is obtained. The target speed of the electric water pump is the smaller of the electric water pump speed required for the regeneration R4 stage and the physical limit speed of the electric water pump at the current temperature.

5. The electric water pump control method for a hybrid power system based on a P1 configuration according to claim 4, characterized in that, The steps for determining the failure level of an electric water pump based on the comparison results include: With the vehicle in normal mode, calculate the ratio of the difference between the current actual speed of the electronic water pump and the currently set target speed to the currently set target speed; When the ratio is less than or equal to the first threshold, the electronic water pump is reported to be fault-free. When the ratio is greater than the first threshold and less than or equal to the second threshold, a first-level fault of the electronic water pump is reported. When the ratio is greater than the second threshold, a level 2 fault of the electronic water pump is reported.

6. The electric water pump control method for a hybrid power system based on a P1 configuration according to claim 5, characterized in that, The method also includes: When a level 2 fault is reported in the electronic water pump, the engine torque is limited based on the water temperature.

7. The electronic water pump control method for a hybrid power system based on a P1 configuration according to claim 1, characterized in that, The hybrid power system includes: an engine fixed to a motor by long bolts; a gearbox output shaft connected to a drive shaft by a flange; and a motor and a motor controller connected by a three-phase cable, with both ends of the three-phase cable fixed by copper bolts.

8. The electronic water pump control method for a hybrid power system based on a P1 configuration according to claim 1, characterized in that, The hybrid power system includes: a motor controller connected to a high-voltage distribution box via a wiring harness, with copper lugs at both ends of the wiring harness connected by copper bolts; the high-voltage distribution box connected to the power battery via a wiring harness; and the high-voltage distribution box connected to the electric water pump via a wiring harness.

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