Hybrid vehicle gear shifting control method, vehicle-mounted controller, automobile and medium

Abstract

The application discloses a hybrid vehicle gear shifting control method, a vehicle-mounted controller, a vehicle and a medium. The hybrid vehicle gear shifting control method comprises the following steps: acquiring a current gear shifting request and current vehicle data, wherein the current vehicle data comprises an actual engine speed; judging whether a gear shifting impact condition is met based on the current gear shifting request and the current vehicle data; if the gear shifting impact condition is met, acquiring a target engine speed according to the actual engine speed; and controlling a generator to work according to the target engine speed and the actual engine speed. The technical scheme can improve the stability during the gear shifting of the hybrid vehicle.

Description

Technical Field

[0001] This invention relates to the field of hybrid vehicle technology, and more particularly to a hybrid vehicle shift control method, an on-board controller, a vehicle, and a medium. Background Technology

[0002] Existing power-split hybrid vehicles generally include an engine, a generator MG1, an electric motor MG2, and a power-split mechanism located between the generator MG1 and the electric motor MG2. Hybridization is achieved by controlling the operation of the engine, generator MG1, electric motor MG2, and power-split mechanism.

[0003] However, in the power-split hybrid vehicle, during gear shifting, such as when shifting from P / D / R to N, the control processes of the ECU (Engine Control Unit) and VCU (Vehicle Control Unit) are completely decoupled, resulting in a noticeable shock during gear shifting in the power-split hybrid vehicle. Summary of the Invention

[0004] This invention provides a hybrid vehicle shift control method, an on-board controller, a vehicle, and a medium to solve the problem of shift shock in hybrid vehicles.

[0005] A method for shifting gears in a hybrid vehicle, comprising:

[0006] Obtain the current shift request and current vehicle data, wherein the current vehicle data includes the actual engine speed;

[0007] Based on the current shift request and the current vehicle data, determine whether the shift shock condition is met;

[0008] If the shift shock condition is met, the target engine speed is obtained based on the actual engine speed.

[0009] The generator is controlled to operate based on the target engine speed and the actual engine speed.

[0010] Furthermore, the current vehicle data includes the vehicle speed and the actual engine speed;

[0011] The step of determining whether the shift shock condition is met based on the current shift request and the current vehicle data includes:

[0012] If the current shift request is a shift from non-neutral to neutral, the vehicle speed is equal to the preset speed, and the actual engine speed is greater than the target speed threshold, then the shift shock condition is considered to be met.

[0013] Further, obtaining the target engine speed based on the actual engine speed includes:

[0014] The engine target speed is obtained based on the actual engine speed and the target speed compensation value.

[0015] Furthermore, controlling the generator to operate based on the engine's target speed and actual engine speed includes:

[0016] During the target control period, the generator is controlled to operate based on the target engine speed and the actual engine speed.

[0017] Furthermore, controlling the generator to operate based on the target engine speed and the actual engine speed during the target control period includes:

[0018] The engine speed difference is obtained based on the target engine speed and the actual engine speed.

[0019] The target adjustment torque is obtained based on the engine speed difference.

[0020] During the target control period, the generator is controlled to adjust the torque according to the target adjustment torque.

[0021] Further, obtaining the target adjustment torque based on the engine speed difference includes:

[0022] The target regulating torque is obtained based on the engine speed difference and the speed adjustment coefficient.

[0023] Furthermore, after controlling the generator to operate based on the target engine speed and the actual engine speed during the target control period, the hybrid vehicle shift control method further includes:

[0024] After the target control period, the engine is controlled to operate based on the current vehicle data.

[0025] An on-board controller includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described hybrid vehicle shift control method.

[0026] A hybrid vehicle includes the aforementioned on-board controller.

[0027] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described hybrid vehicle shift control method.

[0028] The aforementioned hybrid vehicle shift control method, on-board controller, vehicle, and medium, wherein after the on-board controller obtains the current shift request and current vehicle data, it determines whether the shift impact condition is met based on the current shift request and current vehicle data. If the shift impact condition is met, it obtains the engine target speed based on the actual engine speed. Finally, based on the engine target speed and the actual engine speed, it controls the generator to work. Thus, it can promptly determine whether the shift impact condition is met through the current shift request and current vehicle data, and control the generator to work based on the engine target speed and the actual engine speed, so that the generator torque and engine torque can interact, ensuring torque balance and improving the smoothness of the hybrid vehicle shift process. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart of a hybrid vehicle shift control method according to an embodiment of the present invention;

[0031] Figure 2 This is another flowchart of a hybrid vehicle shift control method in one embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of an on-board controller in one embodiment of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below 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.

[0034] This invention provides a hybrid vehicle shift control method applicable to hybrid vehicles. The hybrid vehicle includes an on-board controller. The on-board controller includes, but is not limited to, a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned hybrid vehicle shift control method.

[0035] In one embodiment, such as Figure 1As shown, a method for shifting gears in a hybrid vehicle is provided. Taking the application of an on-board controller as an example, the method includes the following steps:

[0036] S101: Obtain the current shift request and current vehicle data, including the actual engine speed.

[0037] S102: Based on the current shift request and current vehicle data, determine whether the shift shock condition is met.

[0038] S103: If the shift shock condition is met, the target engine speed is obtained based on the actual engine speed.

[0039] S104: Controls the generator operation based on the engine target speed and the engine actual speed.

[0040] The current shift request refers to a request used to instruct the vehicle controller to switch gears. For example, the current shift request instructs the vehicle controller to switch the current gear to the target gear. Optionally, the current gear is P (Park) / D (Drive) / R (Reverse), i.e., not neutral. The target gear is N (Neutral). Current vehicle data refers to vehicle data acquired at the current moment. As an example, current vehicle data includes the vehicle speed and the actual engine speed. The vehicle speed refers to the speed of the hybrid vehicle. The actual engine speed refers to the actual engine speed in the hybrid vehicle.

[0041] As an example, in step S101, the vehicle controller acquires the current shift request and the current vehicle data. In this example, to avoid shift shock during gear shifting in the hybrid vehicle, the vehicle controller needs to acquire the current vehicle data to determine whether responding to the current shift request will cause shift shock in the hybrid vehicle, thereby improving the smoothness of gear shifting in the hybrid vehicle.

[0042] Among them, the shift shock condition refers to the user-defined condition used to determine whether the hybrid vehicle will experience a shift shock when the on-board controller responds to the current shift request.

[0043] As an example, in step S102, the vehicle controller determines whether the shift shock condition is met based on the current shift request and current vehicle data. For instance, when the hybrid vehicle is stationary and the engine is still running, if the current shift request is from non-neutral to neutral, then according to the torque balance formula: T eng -T(MG1, MG2)≤T D , among which, T eng T represents the engine torque, and T(MG1, MG2) represents the system torque. DThis refers to the mechanical damping torque. Before the on-board controller shifts from non-neutral to neutral, the VCU is in load operation mode, and all the work done by the engine is used to generate electricity for the generator MG1. The torque in the hybrid vehicle is in a balanced state. When the on-board controller shifts from non-neutral to neutral, the engine target speed output by the VCU drops to 0, and the engine torque gradually decreases due to the filtering function. This results in a lack of interaction between the generator torque and the engine torque when the hybrid vehicle shifts from non-neutral to neutral, causing a torque imbalance and a shift shock problem. Therefore, the on-board controller needs to determine whether the shift shock condition is met based on the current shift request and current vehicle data to ensure the smoothness of the hybrid vehicle during the transition from non-neutral to neutral in subsequent steps.

[0044] The engine target speed refers to the engine speed output by the VCU.

[0045] As an example, in step S103, after the vehicle controller determines that the shift shock condition is met based on the current shift request and current vehicle data, it obtains the engine target speed based on the actual engine speed. Exemplarily, the vehicle controller can output the engine target speed by inputting the actual engine speed according to a preset target speed calculation strategy. In this example, the target speed calculation strategy is a user-preset strategy; by inputting the actual engine speed, the system can output the engine target speed calculation strategy.

[0046] As an example, in step S104, the vehicle controller controls the generator to operate based on the target engine speed and the actual engine speed. To ensure the torque in the hybrid vehicle is balanced, the generator torque and engine torque can interact to prevent shift shock during the transition from non-neutral to neutral. In this example, since the engine torque gradually decreases due to filtering after the vehicle controller switches from non-neutral to neutral, by ensuring the generator MG1's torque is positive, even if the target engine speed is greater than the actual engine speed, the generator can be controlled to operate, maintaining a balance between the generator torque and engine torque after the vehicle controller switches from non-neutral to neutral, thus improving the smoothness of the hybrid vehicle during the transition from non-neutral to neutral.

[0047] As another example, the onboard controller, based on a preset torque adjustment calculation strategy, takes the target engine speed and the actual engine speed as input, outputs the target torque adjustment, and controls the generator to operate according to the target torque adjustment. After the hybrid vehicle stabilizes, it then controls the engine to operate, improving the smoothness of the hybrid vehicle during the transition from non-neutral to neutral. In this example, the torque adjustment calculation strategy is a user-preset calculation strategy; by inputting the target engine speed and the actual engine speed, it can output the target torque adjustment.

[0048] In this embodiment, the vehicle controller determines whether the shift shock condition is met based on the acquired current shift request and current vehicle data. If the shift shock condition is met, the target engine speed is obtained based on the actual engine speed. Finally, the generator is controlled to work based on the target engine speed and the actual engine speed. This allows the controller to promptly determine whether the shift shock condition is met based on the current shift request and current vehicle data. By controlling the generator to work based on the target engine speed and the actual engine speed, the generator torque and engine torque can interact, ensuring torque balance between the generator torque and engine torque and improving the smoothness of the hybrid vehicle's shifting process.

[0049] In one embodiment, the current vehicle data includes the vehicle speed and the actual engine speed; in step S102, based on the current shift request and the current vehicle data, it is determined whether the shift impact condition is met, including: if the current shift request is a shift from non-neutral to neutral, the vehicle speed is equal to the preset speed and the actual engine speed is greater than the target speed threshold, then the shift impact condition is determined to be met.

[0050] The preset vehicle speed is a user-defined speed. The target engine speed threshold is the engine speed used for user-defined settings. Preferably, the preset vehicle speed is 0 km / h and the target engine speed threshold is 1000 r / min.

[0051] As an example, if the current shift request is to switch from non-neutral to neutral, the vehicle speed is 0 km / h, and the actual engine speed is greater than 1000 r / min, meaning the hybrid vehicle is stationary, and the non-neutral gear is switched to neutral, based on the analysis of the above embodiments, the hybrid vehicle is prone to shift shock at this time. Therefore, the on-board controller determines that the shift shock condition is met, so that in subsequent steps, it controls the generator to work according to the engine target speed and the actual engine speed, thereby improving the smoothness of the hybrid vehicle's shifting process.

[0052] As another example, if the current shift request is not a shift from non-neutral to neutral, or the vehicle speed is not equal to the preset speed, or the actual engine speed is not greater than the target speed threshold, then the shift shock condition is deemed not to be met.

[0053] In this embodiment, when the current shift request is to switch from non-neutral to neutral, and the vehicle speed is equal to the preset speed and the actual engine speed is greater than the target speed threshold, the vehicle controller can determine that the shift shock condition is met. In subsequent steps, the controller will control the generator to work based on the target engine speed and the actual engine speed, thereby improving the smoothness of the hybrid vehicle's shift process.

[0054] In one embodiment, step S103, namely obtaining the engine target speed based on the actual engine speed, includes: obtaining the engine target speed based on the actual engine speed and the target speed compensation value.

[0055] The target speed compensation value is a user-defined speed. Preferably, the target speed compensation value is 30-50 r / min.

[0056] As an example, the vehicle controller obtains the engine target speed based on the actual engine speed and the target speed compensation value. Exemplarily, the vehicle controller uses a preset target speed calculation formula to obtain the engine target speed based on the actual engine speed and the target speed compensation value. For example, the preset target speed calculation formula is: N tag =n1 + Δn, where N tag Let n be the engine target speed, n1 be the actual engine speed, and Δn be the target speed compensation value. Therefore, the on-board controller, based on the preset target speed calculation formula, inputs the actual engine speed and the target speed compensation value to obtain the engine target speed. This ensures that the engine target speed output by the VCU is greater than the actual engine speed, guaranteeing that the torque of the generator MG1 is positive. This allows the on-board controller to maintain a balance between the generator torque and the engine torque after switching from non-neutral to neutral, improving the smoothness of the hybrid vehicle during the transition from non-neutral to neutral.

[0057] In this embodiment, the vehicle controller obtains the engine target speed based on the actual engine speed and the target speed compensation value, which enables the engine target speed output by the VCU to be greater than the actual engine speed, ensuring that the torque of the generator MG1 is positive. Even during the process of switching from non-neutral to neutral, the generator torque and engine torque remain balanced, improving the smoothness of the hybrid vehicle during the transition from non-neutral to neutral.

[0058] In one embodiment, step S104, namely controlling the generator to work based on the engine target speed and the engine actual speed, includes: controlling the generator to work based on the engine target speed and the engine actual speed during the target control period.

[0059] The target control period refers to a user-defined time period. Preferably, the target control period is 1 second. For example, within 1 second after a hybrid vehicle shifts from neutral to neutral, the engine torque T... eng As the torque gradually decreases, the torque of the generator MG1 also decreases with the actual engine speed, and the engine torque cannot interact with each other, breaking the torque balance state, thus producing a shift shock.

[0060] As an example, the on-board controller controls the generator to work according to the target engine speed and the actual engine speed during the target control period. This allows the generator to work with appropriate torque, avoiding shift shock and improving the smoothness of the hybrid vehicle when shifting from neutral to neutral.

[0061] As another example, after the target control period, the vehicle controller will be in neutral after the hybrid vehicle has shifted gears, so it only needs to control the engine.

[0062] In this embodiment, the on-board controller controls the generator to work according to the target engine speed and the actual engine speed during the target control period. This avoids shift shock during the target control period after the hybrid vehicle switches to neutral, and improves the smoothness of the hybrid vehicle when switching from non-neutral to neutral.

[0063] In one embodiment, such as Figure 2 As shown, step S104, which involves controlling the generator to operate based on the engine target speed and the engine actual speed, includes:

[0064] S201: Obtain the engine speed difference based on the engine target speed and the engine actual speed.

[0065] S202: Obtain the target adjustment torque based on the engine speed difference.

[0066] S203: During the target control period, the generator is controlled to adjust the torque according to the target torque adjustment.

[0067] Among them, the engine speed difference refers to the difference between the engine target speed and the engine actual speed.

[0068] As an example, in step S201, the vehicle controller determines the difference between the engine target speed and the engine actual speed as the engine speed difference based on the engine target speed and the engine actual speed.

[0069] As another example, in step S202, the vehicle controller obtains the target adjustment torque based on the engine speed difference. Exemplarily, the vehicle controller, according to a preset adjustment torque calculation strategy, obtains the engine speed difference based on the target engine speed and the actual engine speed, and then outputs the target adjustment torque based on the engine speed difference.

[0070] As another example, in step S203, the vehicle controller controls the generator to operate according to the target engine speed and the actual engine speed during the target control period. This allows the generator to operate with the target adjusted torque, avoiding shift shock and improving the smoothness of the hybrid vehicle when shifting from non-neutral to neutral. In this example, by adjusting the torque according to the target during the target control period, the vehicle controller can control the generator to adjust the torque, avoiding shift shock and improving the smoothness of the hybrid vehicle when shifting from non-neutral to neutral.

[0071] In this embodiment, the vehicle controller obtains the engine speed difference based on the engine target speed and the engine actual speed, and then obtains the target adjustment torque based on the engine speed difference. This allows the vehicle controller to control the generator to work based on the engine target speed and the engine actual speed during the target control period. This ensures that the generator torque and engine torque are balanced after the vehicle controller switches from non-neutral to neutral, guaranteeing the smoothness of the transition from non-neutral to neutral.

[0072] In one embodiment, step S202, namely obtaining the target adjustment torque based on the engine speed difference, includes: obtaining the target adjustment torque based on the engine speed difference and the speed adjustment coefficient.

[0073] The speed adjustment coefficient is a custom setting.

[0074] As an example, the vehicle controller obtains the target regulating torque based on the engine speed difference and the speed adjustment coefficient. Exemplarily, the vehicle controller can use a preset regulating torque calculation formula; by inputting the engine speed difference and the speed adjustment coefficient, it can output the target regulating torque. For example, the preset regulating torque calculation formula is: T mg1 =K*(N) tag -N eng ), where T mg1 Adjust the torque to the target, N tag For the target engine speed, N eng K represents the engine target speed, and K is the speed adjustment coefficient.

[0075] In this embodiment, the vehicle controller can obtain the target adjustment torque based on the engine speed difference and the speed adjustment coefficient, so as to adjust the engine torque through the target adjustment torque, thereby keeping the generator torque and engine torque balanced after the vehicle controller switches from non-neutral to neutral.

[0076] In one embodiment, after controlling the generator to operate based on the engine target speed and the engine actual speed during the target control period, the hybrid vehicle shift control method further includes: after the target control period, controlling the engine to operate based on the current vehicle data.

[0077] As an example, after the target control period, when the hybrid vehicle switches from non-neutral to neutral, i.e., the hybrid vehicle is in neutral, the engine can be controlled to work based on the current vehicle data obtained when the hybrid vehicle is in non-neutral, for example, the engine can be controlled to work according to the actual engine speed.

[0078] In this embodiment, after the target control period, the on-board controller controls the engine to work based on the current vehicle data to complete the shifting process of the hybrid vehicle from non-neutral to neutral.

[0079] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0080] In one embodiment, an in-vehicle controller is provided, which may be a server, and its internal structure diagram may be as follows: Figure 3 As shown, the vehicle controller includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores data used in the process of implementing a hybrid vehicle shift control method. The network interface of the vehicle controller is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a hybrid vehicle shift control method.

[0081] In one embodiment, an on-board controller is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the hybrid vehicle shift control method described in the above embodiment, such as steps S101 to S104. To avoid repetition, these steps will not be described again here.

[0082] In one embodiment, a hybrid vehicle is provided, which includes the on-board controller described in the above embodiment.

[0083] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the hybrid vehicle shift control method described in the above embodiment, such as steps S101 to S104. To avoid repetition, these steps will not be described again here.

[0084] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0085] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0086] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for shifting gears in a hybrid vehicle, characterized in that, include: Obtain the current shift request and current vehicle data, wherein the current vehicle data includes the actual engine speed; Based on the current shift request and the current vehicle data, determine whether the shift shock condition is met; If the shift shock condition is met, the target engine speed is obtained based on the actual engine speed. The generator is controlled to operate based on the target engine speed and the actual engine speed, so as to maintain a balance between the generator torque and the engine torque after switching from non-neutral to neutral.

2. The hybrid vehicle shift control method as described in claim 1, characterized in that, The current vehicle data includes the vehicle speed and the actual engine speed; The step of determining whether the shift shock condition is met based on the current shift request and the current vehicle data includes: If the current shift request is a shift from non-neutral to neutral, the vehicle speed is equal to the preset speed, and the actual engine speed is greater than the target speed threshold, then the shift shock condition is considered to be met.

3. The hybrid vehicle shift control method as described in claim 1, characterized in that, The step of obtaining the target engine speed based on the actual engine speed includes: The engine target speed is obtained based on the actual engine speed and the target speed compensation value.

4. The hybrid vehicle shift control method as described in claim 1, characterized in that, The step of controlling the generator to operate based on the engine target speed and the engine actual speed includes: During the target control period, the generator is controlled to operate based on the target engine speed and the actual engine speed.

5. The hybrid vehicle shift control method as described in claim 4, characterized in that, The step of controlling the generator to operate based on the target engine speed and the actual engine speed during the target control period includes: The engine speed difference is obtained based on the target engine speed and the actual engine speed. The target adjustment torque is obtained based on the engine speed difference. During the target control period, the generator is controlled to adjust the torque according to the target adjustment torque.

6. The hybrid vehicle shift control method as described in claim 5, characterized in that, The step of obtaining the target adjustment torque based on the engine speed difference includes: The target regulating torque is obtained based on the engine speed difference and the speed adjustment coefficient.

7. The hybrid vehicle shift control method as described in claim 4, characterized in that, After controlling the generator to operate based on the target engine speed and the actual engine speed during the target control period, the hybrid vehicle shift control method further includes: After the target control period, the engine is controlled to operate based on the current vehicle data.

8. An on-board controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the hybrid vehicle shift control method as described in any one of claims 1 to 7.

9. A hybrid vehicle, characterized in that, Includes the vehicle controller as described in claim 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the hybrid vehicle shift control method as described in any one of claims 1 to 7.

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