Hybrid vehicle motor overspeed control method and device, hybrid vehicle and storage medium

Abstract

This invention relates to the field of hybrid vehicle technology, specifically disclosing a hybrid vehicle motor overspeed control method, device, hybrid vehicle, and storage medium. The hybrid vehicle motor overspeed control method obtains the actual motor speed, compares the actual speed with a preset speed, and when n... a When the preset speed is less than or equal to the actual speed, the system obtains the actual throttle opening and the slope of the hybrid vehicle. Based on the actual throttle opening and the slope of the hybrid vehicle, it determines the driver's subjective intervention level, determines the adjustment coefficient, determines the target torque demand based on the actual throttle opening, adjusts the target torque demand based on the adjustment coefficient to obtain the actual torque demand, and controls the engine and / or motor to output the actual torque demand. When the actual speed of the motor is close to overspeed, it fully considers the driver's current subjective driving intention, taking into account both motor safety and driving environment safety.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a method, device, hybrid vehicle, and storage medium for controlling overspeed of a hybrid vehicle motor. Background Technology

[0002] For hybrid vehicles, an electric motor is installed between the engine and the transmission. When the motor is in use, it is necessary to prevent its speed from exceeding the limit. If the motor speed exceeds the limit, it will reduce its service life and affect the safety of the motor controller and the motor's durability.

[0003] In response, existing technologies typically detect the motor speed and, when the motor speed is about to exceed a threshold, provide negative torque to the motor to reduce the motor speed and prevent overspeed. However, this control method ignores the driver's subjectivity during the driving process. Because the actual driving scenarios of hybrid vehicles are complex and changeable, if the motor is at risk of overspeed due to the driver's active operation, such control could easily lead to safety accidents. Summary of the Invention

[0004] The purpose of this invention is to provide a method, device, hybrid vehicle, and storage medium for controlling the overspeed of a hybrid vehicle motor, so as to take into account the driver's active operation when controlling the motor speed to prevent it from exceeding the threshold, thereby avoiding safety accidents.

[0005] In a first aspect, the present invention provides a method for overspeed control of a hybrid vehicle motor. The hybrid vehicle includes an engine, a transmission, and a motor connected between the engine and the transmission. The motor is connected to a power battery. The method for overspeed control of a hybrid vehicle motor includes:

[0006] Obtain the actual speed of the motor;

[0007] The actual rotational speed is compared with the preset rotational speed, where the preset rotational speed is the maximum allowable rotational speed of the motor during normal operation.

[0008] If n a *Preset speed ≤ Actual speed < Preset speed, n a <1; then obtain the actual throttle opening and the slope where the hybrid vehicle is located;

[0009] The driver's subjective intervention degree is determined based on the actual opening of the throttle and the slope where the hybrid vehicle is located, and the driver's subjective intervention degree is a real number not greater than 1.

[0010] The adjustment coefficient is determined based on the driver's level of subjective intervention;

[0011] The target torque requirement is determined based on the actual throttle opening.

[0012] The target torque demand is adjusted based on the adjustment coefficient to obtain the actual torque demand.

[0013] The engine and / or electric motor outputs the required torque.

[0014] As a preferred technical solution for the overspeed control method of hybrid vehicle motor, determining the driver's subjective intervention level based on the actual throttle opening and the slope of the hybrid vehicle includes:

[0015] Compare the actual throttle opening with the preset opening size;

[0016] If the actual opening of the throttle is greater than the preset opening and the duration exceeds the preset time, then the slope of the hybrid vehicle is compared with the preset slope.

[0017] If the slope where the hybrid vehicle is located does not exceed the preset slope;

[0018] The driver's degree of subjective intervention is then determined to be 1.

[0019] As a preferred technical solution for the overspeed control method of hybrid vehicle motor, if the actual opening degree is not greater than the preset opening degree, or the duration does not exceed the preset time, or the slope where the hybrid vehicle is located exceeds the preset slope, then the driver's subjective intervention degree is determined to be 0.

[0020] As a preferred technical solution for the overspeed control method of hybrid vehicle motor, adjusting the target required torque based on the adjustment coefficient to obtain the actual required torque includes:

[0021] Actual torque demand = Target torque demand * Adjustment coefficient;

[0022] When the driver's subjective intervention level is 0, the adjustment coefficient is equal to 0; when the driver's subjective intervention level is 1, the adjustment coefficient is equal to a, where a is a real number greater than 0 and less than 1.

[0023] As a preferred technical solution for the overspeed control method of hybrid vehicle motors, the hybrid vehicle motor overspeed control method also includes a step located after the actual required torque output by the engine and / or motor:

[0024] The first alarm message is issued to prompt the driver to brake and to warn the driver that the motor is about to exceed the speed limit.

[0025] As a preferred technical solution for the overspeed control method of hybrid vehicle motor, when comparing the actual speed with the preset speed, if n b *Preset speed ≤ Actual speed < n a *Preset rotation speed, n b <n aThe overspeed control method for hybrid vehicle motors also includes:

[0026] A second alarm message is issued, which is used to prompt the driver to shift up a gear.

[0027] As a preferred technical solution for the overspeed control method of hybrid vehicle motor, when comparing the actual speed with the preset speed, if the actual speed < n b *If the preset speed is selected, the actual speed of the motor will be repeatedly obtained.

[0028] As a preferred technical solution for the overspeed control method of hybrid vehicle motor, when comparing the actual speed with the preset speed, if the preset speed ≤ actual speed < n c *Preset rotation speed, 1 < n c The overspeed control method for hybrid vehicle motors also includes:

[0029] The transmission shifts up;

[0030] The electric motor generates electricity and / or the engine brakes.

[0031] As a preferred technical solution for the overspeed control method of the hybrid vehicle motor, the hybrid vehicle motor overspeed control method also includes the following steps after the motor generates electricity and / or the engine performs engine braking:

[0032] A third alarm message is issued, which is used to remind the driver that the motor has exceeded the speed limit, to remind the driver that a forced upshift has been made, and to remind the driver to apply the brakes.

[0033] As a preferred technical solution for the overspeed control method of hybrid vehicle motor, when comparing the actual speed with the preset speed, if n c If the preset speed is less than or equal to the actual speed, then the overspeed control method for the hybrid vehicle motor also includes:

[0034] Motor torque clearing;

[0035] Stop the high-voltage power supply to the entire vehicle;

[0036] Switch to engine-only drive mode.

[0037] As a preferred technical solution for the hybrid vehicle motor overspeed control method, the hybrid vehicle motor overspeed control method also includes the following after switching to the engine-only drive mode:

[0038] A fourth alarm message is issued, which is used to remind the driver that the motor is seriously overspeeding, to remind the driver to perform braking operation, and to remind the driver that the engine has been switched to the engine-only drive mode.

[0039] Secondly, the present invention also provides a hybrid vehicle motor overspeed control device, wherein the hybrid vehicle includes an engine, a transmission, and a motor connected between the engine and the transmission, the motor being connected to a power battery, and the hybrid vehicle motor overspeed control device includes:

[0040] The actual speed acquisition module is used to acquire the actual speed of the motor;

[0041] The comparison module is used to compare the actual rotational speed with the preset rotational speed, where the preset rotational speed is the maximum allowable rotational speed of the motor during normal operation.

[0042] The throttle opening and gradient acquisition module is used when n a *When the preset speed ≤ actual speed < preset speed, obtain the actual throttle opening and the slope of the hybrid vehicle, n a <1;

[0043] The subjective intervention degree determination module is used to determine the driver's subjective intervention degree based on the actual opening of the throttle and the slope where the hybrid vehicle is located. The driver's subjective intervention degree is a real number not greater than 1.

[0044] The adjustment coefficient determination module is used to determine the adjustment coefficient based on the driver's subjective intervention level;

[0045] The target torque demand determination module is used to determine the target torque demand based on the actual opening of the throttle.

[0046] The actual demand torque determination module is used to adjust the target demand torque based on the adjustment coefficient and obtain the actual demand torque;

[0047] An execution module is used to cause the engine and / or motor to output the actual required torque.

[0048] Thirdly, the present invention also provides a hybrid vehicle, the hybrid vehicle including an engine, a transmission, and a motor connected between the engine and the transmission, the motor being connected to a power battery, and the hybrid vehicle further including:

[0049] Controller;

[0050] A speed sensor is used to detect the actual speed of the motor and send the actual speed to the controller;

[0051] A throttle opening sensor is used to detect the actual opening of the throttle and send the actual opening to the controller;

[0052] A slope sensor is used to detect the slope where the hybrid vehicle is located and send the slope to the controller;

[0053] The dashboard is used to display alarm messages;

[0054] Memory, used to store one or more programs;

[0055] When the controller executes one or more programs, it causes the controller to control the hybrid vehicle to implement the hybrid vehicle motor overspeed control method described in any of the above schemes.

[0056] Fourthly, the present invention also provides a storage medium storing a computer program thereon, which, when executed by a controller, enables the hybrid vehicle to implement the hybrid vehicle motor overspeed control method described in any of the above-mentioned schemes.

[0057] The beneficial effects of this invention are:

[0058] This invention provides a method, device, hybrid vehicle, and storage medium for controlling the overspeed of a hybrid vehicle motor. The method involves acquiring the actual rotational speed of the motor, comparing the actual speed with a preset speed, and controlling the overspeed when n... a When the preset speed is less than or equal to the actual speed, the system obtains the actual throttle opening and the slope of the hybrid vehicle. Based on the actual throttle opening and the slope of the hybrid vehicle, it determines the driver's subjective intervention level, determines the adjustment coefficient, determines the target torque demand based on the actual throttle opening, adjusts the target torque demand based on the adjustment coefficient to obtain the actual torque demand, and controls the engine and / or motor to output the actual torque demand. When the actual speed of the motor is close to overspeed, it fully considers the driver's current subjective driving intention, taking into account both motor safety and driving environment safety. Attached Figure Description

[0059] Figure 1 This is a flowchart of the hybrid vehicle motor overspeed control method in an embodiment of the present invention;

[0060] Figure 2 This is a schematic diagram of the structure of the hybrid vehicle motor overspeed control device in an embodiment of the present invention;

[0061] Figure 3 This is a schematic diagram of the vehicle structure in an embodiment of the present invention. Figure 1 ;

[0062] Figure 4 This is a schematic diagram of the vehicle structure in an embodiment of the present invention. Figure 2 .

[0063] In the picture:

[0064] 100. Actual RPM Acquisition Module; 110. Comparison Module; 120. Throttle Opening and Gradient Acquisition Module; 130. Subjective Intervention Determination Module; 140. Adjustment Coefficient Determination Module; 150. Target Required Torque Determination Module; 160. Actual Required Torque Determination Module; 170. Execution Module;

[0065] 200. Engine; 210. Gearbox; 220. Motor; 230. Power battery; 240. Controller; 250. Speed ​​sensor; 260. Throttle opening sensor; 270. Slope sensor; 280. Instrument panel; 290. Memory. Detailed Implementation

[0066] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0069] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0070] Example 1

[0071] Existing technologies typically detect motor speed and apply negative torque to the motor when it is about to exceed a threshold to reduce the motor speed and prevent overspeed. However, this control method ignores the driver's subjectivity during driving. Since the actual driving scenarios of hybrid vehicles are complex and changeable, if the motor is at risk of overspeed due to the driver's active operation, such control could easily lead to safety accidents.

[0072] To address this issue, this embodiment provides a hybrid vehicle motor overspeed control method. This method is applicable to controlling the motor speed of a hybrid vehicle. It can be executed by a hybrid vehicle motor overspeed control device, which can be implemented through software and / or hardware and integrated into the hybrid vehicle.

[0073] Specifically, this hybrid vehicle employs a P2 system, which includes an engine, a transmission, and an electric motor connected between the engine and the transmission. The motor is connected to a power battery, the transmission is connected to a drive axle, and the drive axle is connected to the wheels. The engine and / or the electric motor can transmit power to the transmission and ultimately output it to the wheels. The electric motor can also generate electricity and store it in the power battery.

[0074] Specifically, such as Figure 1 As shown, the overspeed control method for the motor of this hybrid vehicle includes the following steps:

[0075] S100: Obtain the actual speed of the motor.

[0076] The actual speed of the motor can be obtained through a speed sensor.

[0077] S110: Compare the actual speed with the preset speed. The preset speed is the maximum allowable speed when the motor is running normally.

[0078] If n a *Preset speed ≤ Actual speed < Preset speed, n a If <1, then execute S120.

[0079] If n b *Preset speed ≤ Actual speed < n a *Preset rotation speed, n b <na If so, then execute S190.

[0080] If the actual rotational speed is < n b If the preset speed is reached, repeat step S100; at this time, the motor speed is within the normal range and has not reached the minimum limit for upshifting, so no adjustment is required.

[0081] If the preset speed ≤ the actual speed < n c *Preset rotation speed, 1 < n c If so, then S200 will be executed.

[0082] If n c If the preset speed is less than or equal to the actual speed, then execute S230.

[0083] In this embodiment, n a =0.95; n c =1.1. In other embodiments, n a n c The value can also be set as needed.

[0084] S120: Obtain the actual throttle opening and the slope where the hybrid vehicle is located.

[0085] The throttle opening can be detected by a throttle opening sensor, and the slope of the hybrid vehicle can be detected by a slope sensor or gyroscope.

[0086] S130: Determine the driver's subjective intervention level based on the actual throttle opening and the slope of the hybrid vehicle.

[0087] In this embodiment, the driver's degree of subjective intervention is a real number not greater than 1. Specifically, in this embodiment, the driver's degree of subjective intervention is 0 or 1.

[0088] Specifically, determining the driver's subjective intervention level based on the actual throttle opening and the slope of the hybrid vehicle includes the following steps.

[0089] S1301: Compare the actual throttle opening with the preset opening;

[0090] If the actual throttle opening is greater than the preset opening and the duration exceeds the preset time, then execute S1302; if the actual opening is not greater than the preset opening or the duration does not exceed the preset time, then execute S1304.

[0091] S1302: Compare the slope where the hybrid vehicle is located with the preset slope.

[0092] If the slope where the hybrid vehicle is located does not exceed the preset slope, then execute S1303; if the slope where the hybrid vehicle is located exceeds the preset slope, then execute S1304.

[0093] S1303: Determine the driver's degree of subjective intervention as 1.

[0094] S1304: The driver's subjective intervention level is determined to be 0.

[0095] In this embodiment, the preset opening is 20% of the maximum throttle opening; the preset time is 3 seconds; and the preset slope is -5°. In other embodiments, the preset opening, preset time, and preset slope can be adjusted according to actual needs.

[0096] It should be noted that when the actual throttle opening is greater than the preset opening, the hybrid vehicle will be in an accelerating state if it is driving on a flat road.

[0097] When the actual throttle opening is greater than the preset opening and the duration exceeds the preset time, it indicates that the driver is actively pressing the throttle and has a strong subjective intention. Based on this, when the slope of the hybrid vehicle does not exceed -5°, it indicates that the hybrid vehicle is on a flat road, an uphill slope, or a downhill slope between 0 and -5°. In this case, the driver's subjective intervention level is determined to be 1. The driver's insistence on vehicle acceleration may be influenced by external factors, such as overtaking or emergency obstacle avoidance. Simultaneously, when the slope of the hybrid vehicle does not exceed -5°, the vehicle's own weight cannot drive the vehicle to move on its own, so the motor will not immediately exceed the speed limit. In this situation, the driver's subjective intention can be considered to ensure vehicle safety, but the target torque expected by the driver also needs to be reduced to protect the motor.

[0098] However, if the actual throttle opening exceeds the preset opening and the duration exceeds the preset time, and the slope the hybrid vehicle is on exceeds the preset slope, then the driver's subjective intervention level must be set to 0. This is because when the slope exceeds -5°, the vehicle can move on its own under its own weight. Even without the driver actively accelerating, the hybrid vehicle's speed will increase, leading to an increase in the motor's speed. If the driver actively accelerates when the slope exceeds -5°, it will exacerbate the risk of the motor overspeeding. Therefore, the driver's subjective intervention level needs to be set to 0 to ensure that the actual torque demand is minimized in subsequent steps to protect the motor.

[0099] If the actual throttle opening is not greater than the preset opening, or if the actual throttle opening is greater than the preset opening but the duration is less than the preset time, it indicates that the driver may have misoperated the accelerator pedal, causing it to be touched. In this case, the driver's subjective intervention should be set to 0.

[0100] S140: Determine the adjustment coefficient based on the driver's subjective intervention.

[0101] In this embodiment, the controller pre-stores a first correspondence between the driver's subjective intervention level and the adjustment coefficient. This first correspondence can be obtained based on a large number of previous tests, and the corresponding adjustment coefficient can be queried from the first correspondence based on the driver's subjective intervention level.

[0102] Specifically, in this embodiment, when the driver's subjective intervention level is set to 0, the adjustment coefficient is 0; when the driver's subjective intervention level is set to 1, the adjustment coefficient is a; where a is a real number greater than 0 and less than 1. This embodiment exemplarily provides a scheme where a equals 50%, but in other embodiments, the value of a can be adjusted as needed.

[0103] S150: Determines the target torque requirement based on the actual throttle opening.

[0104] In this embodiment, the controller pre-stores a second correspondence between the actual throttle opening and the target torque requirement. This second correspondence can be obtained based on a large number of previous tests, and the corresponding target torque requirement can be queried from the second correspondence based on the actual throttle opening.

[0105] S160: Adjust the target torque demand based on the adjustment coefficient to obtain the actual torque demand.

[0106] In this embodiment, the actual required torque = the target required torque * the adjustment coefficient. In other embodiments, the relationship between the actual required torque, the target required torque, and the adjustment coefficient can be set as needed.

[0107] When the actual throttle opening is greater than the preset opening and the duration exceeds the preset time, and the slope of the hybrid vehicle does not exceed the preset slope, the actual torque demand is adjusted to half of the target torque demand. When the actual throttle opening is not greater than the preset opening, or the duration does not exceed the preset time, or the slope of the hybrid vehicle exceeds the preset slope, the actual torque demand is adjusted to 0. Specifically, when the driver's subjective intervention is 0, it is equivalent to the driver's operation being a mistake, or although the driver is subjectively operating, the hybrid vehicle is going down a steep slope, which could easily cause the motor to overspeed quickly, posing a significant safety hazard. Therefore, the actual torque demand needs to be equal to 0. When the driver's subjective intervention is 1, it is equivalent to the driver's subjective operation, indicating that the driver may need to accelerate the vehicle due to the actual driving environment. However, this also increases the risk of motor overspeed to some extent. To balance motor safety and actual road conditions, the actual torque demand is equal to 50% of the target torque demand.

[0108] S170: Actual required torque output from the engine and / or electric motor.

[0109] The hybrid vehicle motor overspeed control method provided in this embodiment obtains the actual speed of the motor, compares the actual speed with a preset speed, and when n a When the preset speed is less than or equal to the actual speed, the system obtains the actual throttle opening and the slope of the hybrid vehicle. Based on the actual throttle opening and the slope of the hybrid vehicle, it determines the driver's subjective intervention level, determines the adjustment coefficient, determines the target torque demand based on the actual throttle opening, adjusts the target torque demand based on the adjustment coefficient to obtain the actual torque demand, and controls the engine and / or motor to output the actual torque demand. When the actual speed of the motor is close to overspeed, it fully considers the driver's current subjective driving intention, taking into account both motor safety and driving environment safety.

[0110] Optionally, the hybrid vehicle motor overspeed control method also includes the following steps after step S170:

[0111] S180: Issue the first alarm message, which is used to prompt the driver to brake and to warn the driver that the motor is about to overspeed.

[0112] Specifically, a first warning message can be issued via the instrument panel. This first warning message may include, but is not limited to, audible, visual, and text messages, to prompt the driver to actively slow down. It should be noted that the driver may follow the advice of the first warning message and brake, which can effectively reduce the motor speed. However, the driver may also disregard the first warning message, which may cause the motor to eventually exceed the preset speed.

[0113] S190: Issue a second warning message, which is used to prompt the driver to shift up.

[0114] Specifically, a second alarm message can be issued through the dashboard, which may include, but is not limited to, sound, light, and text.

[0115] Specifically, as long as the current gear is not the highest driving gear, regardless of the current driving gear of the hybrid vehicle, when the motor speed is not less than n... b *At the preset engine speed, the transmission can be controlled to upshift. However, when the current gear is the highest gear, upshifting is not possible because there is no further gear to upshift to.

[0116] When the second warning message is issued, it indicates that the vehicle is at risk of speeding and the driver needs to shift up to eliminate the hazard. Similarly, the driver may follow the second warning message's advice to shift up, or they may not, which could easily cause the motor's actual speed to enter the n range. a*If the preset speed is within the preset speed range, the risk of motor overspeed will be further increased.

[0117] S200: The transmission is upshifting.

[0118] S210: The electric motor generates electricity and / or the engine brakes.

[0119] When preset speed ≤ actual speed < n c *At the preset speed, the motor is already overspeeding. Therefore, it is necessary to force the gearbox to upshift, reducing the transmission ratio and using the wheels to pull the motor backward, thus reducing its speed. Simultaneously, the motor generates electricity and / or the engine brakes to provide negative torque, further reducing the motor's speed. This situation often occurs on long, steep downhill slopes.

[0120] Optionally, the hybrid vehicle motor overspeed control method also includes the following steps after step S210:

[0121] S220: Issue a third alarm message. The third alarm message is used to inform the driver that the motor has exceeded the speed limit, to inform the driver that a forced upshift has been made, and to remind the driver to perform a braking operation.

[0122] Specifically, a third alarm message can be issued through the dashboard, which may include, but is not limited to, sound, light, and text.

[0123] Normally, steps S00 and S210 can reduce the motor speed, but it is possible that certain special road conditions or mechanical failures may cause the motor speed to exceed n further. c *The preset speed can be controlled using the following steps.

[0124] S230: Motor clearing torque.

[0125] S240: Stop the high-voltage power supply to the entire vehicle.

[0126] When the motor speed exceeds n c *When the preset speed is reached, it indicates that the motor is already severely overspeeding. This can easily cause the back electromotive force generated to exceed the voltage limit of the IGBT (Insulated Gate Bipolar Transistor) of the motor controller (MCU), resulting in the breakdown of the IGBT of the motor controller and a significant reduction in the motor's tolerance.

[0127] S250: Switch to engine-only drive mode.

[0128] Optionally, the hybrid vehicle motor overspeed control method also includes the following located after S250:

[0129] S260: Issues the fourth alarm message, which is used to inform the driver that the motor is seriously overspeeding, to prompt the driver to perform braking operations, and to indicate that the driver has switched to engine-only drive mode.

[0130] Specifically, a fourth alarm message can be issued through the instrument panel, which may include, but is not limited to, sound, light, and text.

[0131] Optionally, step S100 is repeated after steps S190, S220 and S260, thus achieving closed-loop control of the motor speed.

[0132] Example 2

[0133] Figure 2 This is a structural diagram of a hybrid vehicle motor overspeed control device provided in Embodiment 2 of the present invention. The device can execute the hybrid vehicle motor overspeed control method described in the above embodiments. Specifically, the hybrid vehicle motor overspeed control device includes an actual speed acquisition module 100, a comparison module 110, a throttle opening and gradient acquisition module 120, a subjective intervention degree determination module 130, an adjustment coefficient determination module 140, a target required torque determination module 150, an actual required torque determination module 160, and an execution module 170.

[0134] Among them, the actual speed acquisition module 100 is used to acquire the actual speed of the motor; the comparison module 110 is used to compare the actual speed with the preset speed; and the throttle opening and gradient acquisition module 120 is used to acquire the actual speed when n a When the preset speed is less than or equal to the actual speed, the actual throttle opening and the slope of the hybrid vehicle are obtained. The subjective intervention degree determination module 130 is used to determine the driver's subjective intervention degree based on the actual throttle opening and the slope of the hybrid vehicle. The adjustment coefficient determination module 140 is used to determine the adjustment coefficient based on the driver's subjective intervention degree. The target torque demand determination module 150 is used to determine the target torque demand based on the actual throttle opening. The actual torque demand determination module 160 is used to adjust the target torque demand based on the adjustment coefficient and obtain the actual torque demand. The execution module 170 is used to make the engine and / or motor output the actual torque demand.

[0135] The hybrid vehicle motor overspeed control device provided in this embodiment obtains the actual motor speed through the actual speed acquisition module 100; compares the actual speed with the preset speed through the comparison module 110; when n aWhen the preset speed is less than or equal to the actual speed, the throttle opening and the slope of the hybrid vehicle are obtained by the throttle opening and slope acquisition module 120; the subjective intervention degree determination module 130 determines the driver's subjective intervention degree based on the actual throttle opening and the slope of the hybrid vehicle; the adjustment coefficient determination module 140 determines the adjustment coefficient based on the driver's subjective intervention degree; the target torque demand determination module 150 determines the target torque demand based on the actual throttle opening; the actual torque demand determination module 160 adjusts the target torque demand based on the adjustment coefficient to obtain the actual torque demand; and the execution module 170 enables the engine and / or motor to output the actual torque demand, which fully considers the driver's current subjective driving intention when the actual speed of the motor is close to overspeed, thus taking into account both motor safety and driving environment safety.

[0136] Example 3

[0137] This embodiment provides a vehicle, such as Figure 3 and Figure 4 As shown, the vehicle includes an engine 200, a transmission 210, a motor 220, a power battery 230, a controller 240, a speed sensor 250, a throttle opening sensor 260, a slope sensor 270, an instrument panel 280, and a memory 290. The engine 200, transmission 210, motor 220, power battery 230, controller 240, speed sensor 250, throttle opening sensor 260, slope sensor 270, instrument panel 280, and memory 290 can be connected via a bus. The motor 220 is connected between the engine 210 and the transmission 220, and is connected to the power battery 230. The transmission 210 is connected to the drive axle, and the drive axle is connected to the wheels. A clutch is also provided between the engine 200 and the motor 220. The engine 200 and / or the motor 220 can transmit power to the transmission 210 and ultimately output it to the wheels. The motor 220 can also generate electricity and store it in the power battery 230. The speed sensor 250 is used to detect the actual speed of the motor and send the actual speed to the controller 240; the throttle opening sensor 260 is used to detect the actual throttle opening and send the actual opening to the controller 240; the slope sensor 270 is used to detect the slope of the hybrid vehicle and send the slope to the controller 240; the instrument panel 280 is used to issue alarm information.

[0138] Please refer to Figure 3The controller 240 specifically includes a hybrid control unit (HCU), an engine control unit (ECU), an automatic transmission control unit (TCU), and a motor control unit (MCU). The ECU is connected to the engine 200, the TCU is connected to the transmission 210 and clutch, the TCU is connected to the motor 220 and the power battery 230, and the HCU is connected to the ECU, TCU, MCU, power battery 230, instrument panel 280, and various sensors via a bus.

[0139] The memory 290, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the hybrid vehicle motor overspeed control method in this embodiment of the invention. The controller 240 executes various functional applications and data processing of the hybrid vehicle by running the software programs, instructions, and modules stored in the memory 290, thereby enabling the hybrid vehicle to implement the hybrid vehicle motor overspeed control method described in the above embodiment.

[0140] The memory 290 primarily includes a program storage area and a data storage area. The program storage area stores the operating system and at least one application program required for a given function; the data storage area stores data created based on terminal usage. Furthermore, the memory 290 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 290 may further include memory remotely configured relative to the controller 240, which can be connected to the hybrid vehicle via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0141] The vehicle provided in Embodiment 4 of the present invention and the hybrid vehicle motor overspeed control method provided in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments. Furthermore, this embodiment has the same beneficial effects as the hybrid vehicle motor overspeed control method.

[0142] Example 4

[0143] Embodiment 4 of the present invention also provides a storage medium storing a computer program thereon, which, when executed by a controller, enables the hybrid vehicle to implement the hybrid vehicle motor overspeed control method as described in the above embodiments of the present invention.

[0144] Of course, the computer-executable instructions provided in the embodiments of the present invention are not limited to the operations in the hybrid vehicle motor overspeed control method as described above, but can also perform related operations in the hybrid vehicle motor overspeed control method provided in the embodiments of the present invention, and have corresponding functions and beneficial effects.

[0145] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a robot, personal computer, server, or network device, etc.) to execute the hybrid vehicle motor overspeed control method described in the various embodiments of the present invention.

[0146] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. 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 claims of the present invention.

Claims

1. A method for overspeed control of a hybrid vehicle motor, the hybrid vehicle comprising an engine, a transmission, and a motor connected between the engine and the transmission, the motor being connected to a power battery, characterized in that, include: Obtain the actual speed of the motor; The actual rotational speed is compared with the preset rotational speed, where the preset rotational speed is the maximum allowable rotational speed of the motor during normal operation. If n a *Preset speed ≤ Actual speed < Preset speed, n a <1; then obtain the actual throttle opening and the slope where the hybrid vehicle is located; The driver's subjective intervention degree is determined based on the actual opening of the throttle and the slope where the hybrid vehicle is located, and the driver's subjective intervention degree is a real number not greater than 1. The adjustment coefficient is determined based on the driver's level of subjective intervention; The target torque requirement is determined based on the actual throttle opening. The target torque demand is adjusted based on the adjustment coefficient to obtain the actual torque demand. The engine and / or motor outputs the required torque; When comparing the actual rotational speed with the preset rotational speed, if n b *Preset speed ≤ Actual speed < n a *Preset rotation speed, n b <n a The overspeed control method for hybrid vehicle motors also includes: A second alarm message is issued, which is used to prompt the driver to shift up a gear; When comparing the actual rotational speed with the preset rotational speed, if the preset rotational speed ≤ actual rotational speed < n c *Preset rotation speed, 1 < n c The overspeed control method for hybrid vehicle motors also includes: The transmission shifts up; The electric motor generates electricity and / or the engine brakes.

2. The hybrid vehicle motor overspeed control method according to claim 1, characterized in that, Determining the driver's subjective intervention level based on the actual throttle opening and the slope of the hybrid vehicle includes: Compare the actual throttle opening with the preset opening size; If the actual opening of the throttle is greater than the preset opening and the duration exceeds the preset time, then the slope of the hybrid vehicle is compared with the preset slope. If the slope where the hybrid vehicle is located does not exceed the preset slope; The driver's degree of subjective intervention is then determined to be 1.

3. The hybrid vehicle motor overspeed control method according to claim 2, characterized in that, If the actual opening degree is not greater than the preset opening degree, or the duration does not exceed the preset time, or the slope where the hybrid vehicle is located exceeds the preset slope, then the driver's subjective intervention degree is determined to be 0.

4. The hybrid vehicle motor overspeed control method according to claim 3, characterized in that, Adjusting the target torque demand based on the adjustment coefficient to obtain the actual torque demand includes: Actual torque demand = Target torque demand * Adjustment coefficient; When the driver's subjective intervention level is 0, the adjustment coefficient is equal to 0; when the driver's subjective intervention level is 1, the adjustment coefficient is equal to a, where a is a real number greater than 0 and less than 1.

5. The hybrid vehicle motor overspeed control method according to claim 1, characterized in that, Hybrid vehicle motor overspeed control methods also include those located after the engine and / or motor output the actual required torque: The first alarm message is issued to prompt the driver to brake and to warn the driver that the motor is about to exceed the speed limit.

6. The hybrid vehicle motor overspeed control method according to claim 1, characterized in that, When comparing the actual rotational speed with the preset rotational speed, if the actual rotational speed < n b *If the preset speed is selected, the actual speed of the motor will be repeatedly obtained.

7. The hybrid vehicle motor overspeed control method according to claim 1, characterized in that, Hybrid vehicle motor overspeed control methods also include those following the period after the motor generates electricity and / or the engine applies engine braking: A third alarm message is issued, which is used to remind the driver that the motor has exceeded the speed limit, to remind the driver that a forced upshift has been made, and to remind the driver to apply the brakes.

8. The hybrid vehicle motor overspeed control method according to claim 1, characterized in that, When comparing the actual rotational speed with the preset rotational speed, if n c If the preset speed is less than or equal to the actual speed, then the overspeed control method for the hybrid vehicle motor also includes: Motor torque clearing; Stop the high-voltage power supply to the entire vehicle; Switch to engine-only drive mode.

9. The hybrid vehicle motor overspeed control method according to claim 8, characterized in that, Hybrid vehicle motor overspeed control methods also include those following the switch to engine-only drive mode: A fourth alarm message is issued, which is used to remind the driver that the motor is seriously overspeeding, to remind the driver to perform braking operation, and to remind the driver that the engine has been switched to the engine-only drive mode.

10. A hybrid vehicle motor overspeed control device, the hybrid vehicle including an engine, a transmission, and a motor connected between the engine and the transmission, the motor being connected to a power battery, characterized in that, The method for performing the hybrid vehicle motor overspeed control as described in any one of claims 1-9 includes: The actual speed acquisition module is used to acquire the actual speed of the motor; The comparison module is used to compare the actual rotational speed with the preset rotational speed, where the preset rotational speed is the maximum allowable rotational speed of the motor during normal operation. The throttle opening and gradient acquisition module is used when n a *When the preset speed ≤ actual speed < preset speed, obtain the actual throttle opening and the slope of the hybrid vehicle, n a <1; The subjective intervention degree determination module is used to determine the driver's subjective intervention degree based on the actual opening of the throttle and the slope where the hybrid vehicle is located. The driver's subjective intervention degree is a real number not greater than 1. The adjustment coefficient determination module is used to determine the adjustment coefficient based on the driver's subjective intervention level; The target torque demand determination module is used to determine the target torque demand based on the actual opening of the throttle. The actual demand torque determination module is used to adjust the target demand torque based on the adjustment coefficient and obtain the actual demand torque; An execution module is used to cause the engine and / or motor to output the actual required torque.

11. A hybrid vehicle, the hybrid vehicle comprising an engine, a transmission, and a motor connected between the engine and the transmission, the motor being connected to a power battery, characterized in that, Hybrid vehicles also include: Controller; A speed sensor is used to detect the actual speed of the motor and send the actual speed to the controller; A throttle opening sensor is used to detect the actual opening of the throttle and send the actual opening to the controller; A slope sensor is used to detect the slope where the hybrid vehicle is located and send the slope to the controller; The dashboard is used to display alarm messages; Memory, used to store one or more programs; When the controller executes one or more of the programs, it causes the controller to control the hybrid vehicle to implement the hybrid vehicle motor overspeed control method as described in any one of claims 1-9.

12. A storage medium having a computer program stored thereon, characterized in that, When the program is executed by the controller, the hybrid vehicle implements the hybrid vehicle motor overspeed control method as described in any one of claims 1-9.

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