Control method for avoiding torque interruption in gear shifting process based on double electric drive axles

Abstract

The invention discloses a control method for avoiding torque interruption in a gear shifting process based on double electric drive axles, which has the main conception that whether an auxiliary motor has output torque or not is judged based on a torque request and a total torque demand of a main drive motor of the double electric drive axles; when it is judged that the auxiliary motor has torque output and has the gear shifting requirement, the output torque of the auxiliary motor is reset, the torque attenuation value of the auxiliary motor is obtained, and torque compensation is conducted through the main driving motor; and then the gearbox is requested to execute upshift and downshift, output torque compensation of the main driving motor is canceled after upshift and downshift are completed, and the output torque of the auxiliary motor is recovered. According to the invention, the torque acted by the auxiliary motor can be reliably ensured to be compensated by the main driving motor according to the structure of the double-electric-drive axle in the gear shifting process, and the main driving motor continuously keeps output in the process, so that the situation of torque interruption in the gear shifting process is effectively avoided, and the driving experience and the overall performance are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle drive technology, and in particular to a torque interruption control method for avoiding a gear shifting process based on a dual electric drive axle. Background Art

[0002] With the continuous development of the automobile industry, consumers have higher and higher requirements for automobile performance, comfort and fuel economy. The transmission system of the automobile is a key part that affects the performance of the vehicle, and the performance of the gearbox is crucial. The smoothness, speed and reliability of the gear shifting process are directly related to the driving experience and overall performance of the car, so it has become a key research area for automobile manufacturers and researchers. Summary of the invention

[0003] In view of the above, the present invention aims to provide a control method for avoiding torque interruption during the gear shifting process based on a dual electric drive axle, so as to solve the problem of torque interruption during the gear shifting process, and especially to propose a compensation mechanism for the gear shifting process of a dual electric drive axle, so as to effectively improve the performance of the dual electric drive axle system in terms of torque distribution.

[0004] The technical solution adopted by the present invention is as follows:

[0005] The present invention provides a control method for avoiding torque interruption during gear shifting based on a dual electric drive axle, which includes:

[0006] Based on the main drive motor torque request and the total torque demand, determining whether the auxiliary motor has output torque;

[0007] After determining that the auxiliary motor has torque output, determining whether there is a need to shift gears;

[0008] When it is determined that the auxiliary motor has torque output and there is a shifting demand, the output torque of the auxiliary motor is reset to zero, the torque attenuation value of the auxiliary motor is obtained, and the main drive motor performs torque compensation based on the torque attenuation value;

[0009] Request the transmission to perform upshift and downshift operations;

[0010] After the gearbox completes the upshift and downshift operations, the output torque compensation of the main drive motor is canceled and the output torque of the auxiliary motor is restored.

[0011] In at least one possible implementation manner, determining whether the auxiliary motor has output torque includes:

[0012] Determine the current total torque demand based on vehicle speed and throttle opening;

[0013] Based on the total torque demand and the rotation speed of the main drive motor, obtaining a first torque request initial value of the main drive motor;

[0014] The total torque demand and the first torque request initial value are used to determine the distribution state of the auxiliary motor and obtain a second torque request initial value of the auxiliary motor.

[0015] In at least one possible implementation manner, determining the distribution state of the auxiliary motor and obtaining the second torque request initial value of the auxiliary motor includes:

[0016] Obtaining a difference between the total torque demand and the first torque request initial value;

[0017] If the difference is greater than 0, it is determined that the auxiliary motor has currently distributed torque, and the initial value of the second torque request is the difference.

[0018] In at least one possible implementation manner, the torque compensation value of the main drive motor is: torque attenuation value×preset coefficient.

[0019] In at least one possible implementation manner, the determining whether there is a gear shift demand includes: determining whether there is a gear shift demand according to a rotation speed of the auxiliary motor and a throttle opening.

[0020] In at least one possible implementation, the control method includes: when it is determined that the auxiliary motor currently has no output torque and there is a gear shifting demand, directly requesting the transmission to perform a shift up or down operation.

[0021] Compared with the prior art, the main design concept of the present invention is to determine whether the auxiliary motor has output torque based on the torque request of the main drive motor of the dual electric drive bridge and the total torque demand; after determining that the auxiliary motor has torque output, determine whether there is a shift demand; when it is determined that the auxiliary motor has torque output and there is a shift demand, the output torque of the auxiliary motor is cleared to obtain the torque attenuation value of the auxiliary motor, and the main drive motor performs torque compensation; request the gearbox to perform upshift and downshift operations; after the gearbox completes the upshift and downshift operations, cancel the output torque compensation of the main drive motor and restore the output torque of the auxiliary motor. The above concept of the present invention can reliably ensure that during the shifting process, the torque of the auxiliary motor is compensated by the main drive motor according to the structure of the dual electric drive bridge. During this process, the main drive motor continues to output, effectively avoiding torque interruption during the shifting process, thereby greatly improving the driving experience and overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0023] Figure 1 A schematic diagram of a control method for avoiding torque interruption during a gear shifting process based on a dual electric drive axle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0025] The present invention proposes an embodiment of a control method for avoiding torque interruption during gear shifting based on a dual electric drive axle. Specifically, Figure 1 shown, including:

[0026] Step S1, based on the torque request of the main drive motor (motor 1) and the total torque demand, determining whether the auxiliary motor (motor 2) has output torque;

[0027] To expand:

[0028] Based on the vehicle speed and throttle opening (for example, a pre-calibrated MAP table can be queried), the current total torque demand is determined, and the total torque demand method is used to ensure the stability of the vehicle torque output value.

[0029] Based on the total torque demand and the speed of the main drive motor (which can also be implemented by table lookup), obtaining a first torque request initial value of the main drive motor;

[0030] The total torque demand and the first torque request initial value are used to determine the allocation status of the auxiliary motor and obtain the second torque request initial value of the auxiliary motor (specifically, the difference between the total torque demand and the first torque request initial value can be determined. If the difference is greater than 0, it is considered that the current auxiliary motor has allocated torque, and the second torque request initial value is the difference).

[0031] Step S2: after determining that the auxiliary motor has torque output, determine whether there is a gear shift demand;

[0032] In actual operation, whether there is a need to shift gears can be determined by the speed of the auxiliary motor and the throttle opening.

[0033] Step S3: when it is determined that the auxiliary motor has torque output (second torque request initial value) and there is a shifting demand, the output torque of the auxiliary motor is reset to zero to obtain the torque attenuation value ΔT of the auxiliary motor; and the main drive motor performs torque compensation synchronously;

[0034] It is understandable that the torque distribution of the main drive motor will change at this time, that is, an updated torque request value of the main drive motor is obtained. In some preferred embodiments, the torque compensation value of the main drive motor at this time can be: torque attenuation value ΔT*preset coefficient.

[0035] Step S4, requesting the transmission to perform a shift up or down operation;

[0036] Step S5: After the gearbox completes the upshift and downshift operations, the output torque compensation of the main drive motor is cancelled, and the output torque of the auxiliary motor is restored.

[0037] Finally, it can be added that when it is determined that the current auxiliary motor does not have output torque and there is a need to shift gears, the gearbox is directly requested to perform upshift and downshift operations.

[0038] In summary, the main design concept of the present invention is to determine whether the auxiliary motor has output torque based on the torque request of the main drive motor of the dual electric drive bridge and the total torque demand; after determining that the auxiliary motor has torque output, determine whether there is a shift demand; when it is determined that the auxiliary motor has torque output and there is a shift demand, the output torque of the auxiliary motor is cleared to obtain the torque attenuation value of the auxiliary motor, and the main drive motor performs torque compensation; request the gearbox to perform upshift and downshift operations; after the gearbox completes the upshift and downshift operations, cancel the output torque compensation of the main drive motor and restore the output torque of the auxiliary motor. The above concept of the present invention can reliably ensure that during the shift process, the torque of the auxiliary motor is compensated by the main drive motor according to the structure of the dual electric drive bridge. During this process, the main drive motor continues to output, effectively avoiding torque interruption during the shift process, thereby greatly improving the driving experience and overall performance.

[0039] If the expressions expressing orientation are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0040] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A control method for avoiding torque interruption during gear shifting based on dual electric drive axles, characterized in that: include: Based on the main drive motor torque request and the total torque demand, determining whether the auxiliary motor has output torque; After determining that the auxiliary motor has torque output, determining whether there is a need to shift gears; When it is determined that the auxiliary motor has torque output and there is a shifting demand, the output torque of the auxiliary motor is reset to zero, the torque attenuation value of the auxiliary motor is obtained, and the main drive motor performs torque compensation based on the torque attenuation value; Request the transmission to perform upshift and downshift operations; After the gearbox completes the upshift and downshift operations, the output torque compensation of the main drive motor is canceled and the output torque of the auxiliary motor is restored.

2. The method for controlling torque interruption during gear shifting based on dual electric drive axles according to claim 1, characterized in that: The determining whether the auxiliary motor has output torque comprises: Determine the current total torque demand based on vehicle speed and throttle opening; Based on the total torque demand and the rotation speed of the main drive motor, obtaining a first torque request initial value of the main drive motor; The total torque demand and the first torque request initial value are used to determine the distribution state of the auxiliary motor and obtain a second torque request initial value of the auxiliary motor.

3. The method for controlling torque interruption during gear shifting based on dual electric drive axles according to claim 1, characterized in that: The step of determining the distribution state of the auxiliary motor and obtaining the second torque request initial value of the auxiliary motor comprises: Obtaining a difference between the total torque demand and the first torque request initial value; If the difference is greater than 0, it is determined that the auxiliary motor has currently distributed torque, and the initial value of the second torque request is the difference.

4. The method for controlling torque interruption during gear shifting based on dual electric drive axles according to claim 1, characterized in that: The torque compensation value of the main drive motor is: torque attenuation value × preset coefficient.

5. The method for controlling torque interruption during gear shifting based on dual electric drive axles according to claim 1, characterized in that: The determining whether there is a gear shift demand includes: determining whether there is a gear shift demand according to the rotation speed of the auxiliary motor and the throttle opening.

6. The method for controlling torque interruption during gear shifting based on dual electric drive axles according to any one of claims 1 to 5, characterized in that: The control method includes: when it is determined that the auxiliary motor currently has no output torque and there is a gear shifting demand, directly requesting the transmission to perform upshifting and downshifting operations.

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