CN115217952B - Rear axle gear shifting control method and system and vehicle - Google Patents
Rear axle gear shifting control method and system and vehicle Download PDFInfo
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- CN115217952B CN115217952B CN202210237595.7A CN202210237595A CN115217952B CN 115217952 B CN115217952 B CN 115217952B CN 202210237595 A CN202210237595 A CN 202210237595A CN 115217952 B CN115217952 B CN 115217952B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/46—Inputs being a function of speed dependent on a comparison between speeds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
- F16H61/0006—Electronic control units for transmission control, e.g. connectors, casings or circuit boards
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0251—Elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/32—Electric motors actuators or related electrical control means therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The application is suitable for the technical field of vehicle control, and provides a rear axle gear shifting control method and system and a vehicle. The rear axle gear shifting control method comprises the following steps: the whole vehicle controller sends a gear shifting request to the rear axle controller and activates a current limiting flag bit; when the rear axle controller receives a gear shifting request, the rear axle gearbox is controlled to be switched from the current gear to the neutral gear; when the current limiting zone bit is activated, the whole vehicle controller calculates the limiting current of the rear axle driving motor; when the rear axle gearbox is switched from the current gear to the neutral gear, the rear axle controller controls the rear axle driving motor to adjust the rotating speed to the target rotating speed; when the rotating speed of the rear axle driving motor is regulated to the target rotating speed, the rear axle controller controls the rear axle gearbox to be switched from neutral gear to target gear, and the whole vehicle controller exits from the current limiting zone bit; during the activation of the current limit zone bit, the whole vehicle controller controls the working current of the rear axle driving motor to be smaller than the limit current, so that the problem that the battery is over-current due to the overlarge working current of the rear axle driving motor is prevented.
Description
Technical Field
The application belongs to the technical field of vehicle control, and particularly relates to a rear axle gear shifting control method and system and a vehicle.
Background
When the new energy four-wheel drive vehicle shifts gears in the rear axle, firstly, the whole vehicle controller sends a gear shifting request to the rear axle controller, and after the rear axle controller receives the gear shifting request sent by the whole vehicle controller, the rear axle gearbox is controlled to switch the current gear to the neutral gear. And then the rear axle controller controls the rear axle driving motor to regulate the speed, and when the rotating speed of the rear axle driving motor is regulated to the target rotating speed, the rear axle controller controls the rear axle gearbox to be switched from neutral gear to target gear, so that the gear shifting of the rear axle is completed.
In the existing vehicle, the battery on the vehicle can be caused to have an overcurrent problem in the process of shifting gears of the rear axle, and the health of the battery is affected.
Disclosure of Invention
The embodiment of the application provides a rear axle gear shifting control method, a rear axle gear shifting control system and a vehicle, which can solve the problem that a battery is over-current in the process of gear shifting of the rear axle of the vehicle.
In a first aspect, an embodiment of the present application provides a rear axle gear shift control method, including:
the whole vehicle controller sends a gear shifting request to the rear axle controller and activates a current limiting flag bit;
when the rear axle controller receives the gear shifting request, the rear axle gearbox is controlled to be switched from the current gear to the neutral gear;
when the whole vehicle controller activates the current limiting zone bit, the whole vehicle controller calculates the limiting current of the rear axle driving motor;
when the rear axle gearbox is switched from the current gear to the neutral gear, the rear axle controller controls the rear axle driving motor to adjust the rotating speed to the target rotating speed;
when the rotating speed of the rear axle driving motor is regulated to the target rotating speed, the rear axle controller controls the rear axle gearbox to be switched from neutral gear to target gear, and the whole vehicle controller exits from the current limiting zone; and during the activation period of the current limit flag bit, the whole vehicle controller controls the working current of the rear axle driving motor to be smaller than the limit current.
In a possible implementation manner of the first aspect, before the whole vehicle controller sends the shift request to the rear axle controller, the method further includes:
the whole vehicle controller determines the target gear according to the vehicle speed and the rear axle torque request;
when the target gear is different from the current gear of the rear axle gearbox and the front axle is not shifted, the whole vehicle controller reduces the torque and the torque distribution coefficient of the rear axle driving motor;
and when the torque and the torque distribution coefficient of the rear axle driving motor meet preset conditions, the whole vehicle controller sends a gear shifting request to the rear axle controller.
In a possible implementation manner of the first aspect, the calculating, by the vehicle controller, a limiting current of the rear axle driving motor includes:
the vehicle controller obtains the maximum discharge current of the battery, the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory; wherein the high-voltage accessory at least comprises a compressor, a heater and a power supply device;
and the whole vehicle controller calculates and obtains the limiting current according to the maximum discharging current of the battery, the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory.
In a possible implementation manner of the first aspect, when the rear axle controller receives the shift request, the controlling the rear axle gearbox to switch from the current gear to the neutral gear includes:
the rear axle controller activates a gear shift zone bit;
the rear axle gearbox switches the current gear to a neutral gear according to the gear shift marker position;
after the rear axle controller controls the rear axle gearbox to be switched from neutral gear to target gear, the method further comprises the following steps:
and the rear axle controller exits the gear shift zone bit.
In a possible implementation manner of the first aspect, the rear axle controller controls the rear axle driving motor to adjust the rotation speed to a target rotation speed, including:
the rear axle controller activates a rotating speed control zone bit;
the rear axle driving motor adjusts the rotating speed to a target rotating speed according to the rotating speed control zone bit;
when the rotation speed of the rear axle driving motor is adjusted to the target rotation speed, the method further comprises:
and the rear axle controller exits the rotating speed control zone bit.
In a second aspect, an embodiment of the present application provides a rear axle gear shift control system, including a vehicle controller, a rear axle gearbox and a rear axle driving motor;
the whole vehicle controller is used for sending a gear shifting request to the rear axle controller and activating a current limiting zone bit;
the rear axle controller is used for controlling the rear axle gearbox to be switched from the current gear to the neutral gear when the gear shifting request is received;
the whole vehicle controller is also used for calculating the limiting current of the rear axle driving motor when the current limiting zone bit is activated;
the rear axle controller is also used for controlling the rear axle driving motor to adjust the rotating speed to the target rotating speed when the rear axle gearbox is switched from the current gear to the neutral gear;
the whole vehicle controller is also used for exiting the current limit zone bit when the rotating speed of the rear axle driving motor is regulated to the target rotating speed;
the whole vehicle controller is also used for controlling the working current of the rear axle driving motor to be smaller than the limiting current during the activation period of the current limiting zone bit;
the rear axle controller is also used for controlling the rear axle gearbox to be switched from neutral gear to target gear when the rotating speed of the rear axle driving motor is regulated to the target rotating speed.
In a possible implementation manner of the second aspect, the whole vehicle controller is further configured to determine the target gear according to a vehicle speed and a rear axle torque request;
the whole vehicle controller is also used for reducing the torque and the torque distribution coefficient of the rear axle driving motor when the target gear is different from the current gear of the rear axle gearbox and the front axle is not shifted;
and the whole vehicle controller is also used for sending a gear shifting request to the rear axle controller when the torque and the torque distribution coefficient of the rear axle driving motor meet preset conditions.
In a possible implementation manner of the second aspect, the whole vehicle controller is further configured to obtain a maximum discharge current of the battery, an operating current of the front axle driving motor, an operating current of the front axle engine, an operating current of the rear axle generator, and an operating current of the high-voltage accessory; wherein the high-voltage accessory at least comprises a compressor, a heater and a power supply device;
the vehicle controller is further configured to calculate the limiting current according to a maximum discharge current of the battery, a working current of the front axle driving motor, a working current of the front axle engine, a working current of the rear axle generator, and a working current of the high-voltage accessory.
In a possible implementation manner of the second aspect, the rear axle controller is further configured to activate a shift flag bit when the shift request is sent to the rear axle controller;
the rear axle gearbox is used for switching the current gear to a neutral gear according to the gear shift zone;
the rear axle controller is also used for exiting the gear shift zone after the rear axle gearbox is switched from neutral gear to a target gear.
In a third aspect, an embodiment of the present application provides a vehicle including the rear axle shift control system of any one of the first aspects.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
when the rear axle of the vehicle shifts gears, the whole vehicle controller firstly sends a gear shifting request to the rear axle controller, and the current limiting zone bit is activated. When the current limit flag bit is activated, the whole vehicle controller calculates the limit current of the rear axle driving motor. And after receiving the gear shifting request, the rear axle controller controls the rear axle gearbox to be switched from the current gear to the neutral gear, and then controls the rear axle driving motor to adjust the rotating speed to the target rotating speed. When the rotating speed of the rear axle driving motor is the target rotating speed, the whole vehicle controller exits from the current limiting zone bit, and the rear axle controller controls the rear axle gearbox to be switched from the neutral gear to the target gear, so that the rear axle gear shifting is completed. When the rear axle shifts gears, the current limiting zone bit is always in an activated state during the period that the rotation speed of the rear axle driving motor is regulated to the target rotation speed, and at the moment, the whole vehicle controller controls the working current of the rear axle driving motor to be smaller than the limiting current, so that the problem that the working current of the rear axle driving motor is overlarge, and the battery is overflowed is prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a rear axle shift control method according to an embodiment of the present application;
FIG. 2 is a flow chart of a rear axle shift control method according to another embodiment of the present application;
FIG. 3 is a timing diagram of rear axle shift control provided by an embodiment of the present application;
fig. 4 is a schematic block diagram of a rear axle shift control system according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
When the rear axle of the new energy four-wheel drive vehicle shifts, the rotation speed of the rear axle driving motor needs to be controlled to meet the requirement, and the gear shifting can be performed. If the rotation speed of the rear axle driving motor is adjusted too fast, the working current of the rear axle driving motor is too large, so that the power supply current of a battery on a vehicle is too large, and the health of the battery is influenced.
Based on the problems, the application provides a rear axle gear shifting control method. Referring to fig. 1, the rear axle shift control method includes steps S101 to S105.
Step S101, the whole vehicle controller sends a shift request to the rear axle controller, and activates the current limit flag bit.
Specifically, the vehicle controller analyzes parameters such as the speed of the vehicle and the torque request of the rear axle to determine whether the rear axle needs to be shifted. When the whole vehicle controller determines that the vehicle needs to shift the rear axle, the whole vehicle controller sends a shift request to the rear axle controller, and meanwhile, the current limit zone bit is activated.
And step S102, when the rear axle controller receives a gear shifting request, the rear axle gearbox is controlled to be switched from the current gear to the neutral gear.
Step S102 may include step S1021 and step S1022, for example.
In step S1021, when the rear axle controller receives the shift request, the shift flag bit is activated.
Step S1022, the rear axle gearbox switches the current gear to the neutral gear according to the gear shift mark position.
Specifically, when the shift flag is activated, the rear axle gearbox can switch gears. The rear axle controller starts the function of switching the gear of the rear axle gearbox by activating the gear shifting mark position.
Step S103, when the whole vehicle controller activates the current limiting zone bit, the whole vehicle controller calculates the limiting current of the rear axle driving motor.
Specifically, when the whole vehicle controller activates the current limiting zone bit, the whole vehicle controller calculates and obtains the limiting current by acquiring the maximum discharging current of the battery on the vehicle and the current working current of each device. When the rear axle shifts gears, the whole vehicle controller controls the working current of the rear axle driving motor to be always smaller than the limiting current, so that the problem that the battery is overcurrent due to overlarge working current of the rear axle driving motor is prevented.
Illustratively, step S103 includes step S1031 and step S1032.
Step S1031, the whole vehicle controller obtains the maximum discharge current of the battery, the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory; wherein, the high-voltage accessory at least comprises a compressor, a heater and a power supply device.
Specifically, the whole vehicle controller acquires the maximum discharge current of the battery through information interaction with the battery management system. The whole vehicle controller can obtain the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory through other controllers or sensors on the vehicle.
It should be noted that the high-voltage accessory may include other electric components on the vehicle, such as a line-lost current on the vehicle, in addition to the compressor, the heater, and the power supply device.
Step S1031, the whole vehicle controller calculates and obtains limiting current according to the maximum discharging current of the battery, the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory.
Specifically, the limiting current is obtained after subtracting the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory from the maximum discharging current of the battery. If the working current of the rear axle driving motor is smaller than the limiting current, the discharging current of the battery is smaller than the maximum discharging current of the battery, and the battery cannot have the overcurrent problem. If the working current of the rear axle driving motor is larger than the limiting current, the discharging current of the battery is larger than the maximum discharging current of the battery, and at the moment, the battery can have an overcurrent problem and can be damaged.
When the whole vehicle controller calculates the limiting current, the whole vehicle controller limits the working current of the rear axle driving motor, so that the working current of the rear axle driving motor is smaller than the limiting current, the problem of battery overcurrent is prevented, and the effect of protecting the battery is achieved.
Step S104, when the rear axle gearbox is switched from the current gear to the neutral gear, the rear axle controller controls the rear axle driving motor to adjust the rotating speed to the target rotating speed.
Specifically, when the rear axle gearbox is switched from the current gear to the neutral gear, the rear axle gearbox can complete the gear switching when the rotating speed of the rear axle driving motor meets the requirement. Therefore, when the rear axle gearbox is switched from the current gear to the neutral gear, the rear axle controller controls the rear axle driving motor to adjust the rotating speed to the target rotating speed, and the target rotating speed is calculated by the rear axle controller.
Illustratively, step S104 specifically includes step S1041 and step S1042.
In step S1041, the rear axle controller activates the rotational speed control flag bit.
In step S1042, the rear axle driving motor adjusts the rotation speed to the target rotation speed according to the rotation speed control flag bit.
Specifically, the rear axle controller realizes the control of the rotating speed of the rear axle driving motor by activating the rotating speed control zone bit. The rear axle controller activates the rotation speed control flag bit and simultaneously sends the target rotation speed to the rear axle driving motor.
Step S105, when the rotating speed of the rear axle driving motor is regulated to the target rotating speed, the rear axle controller controls the rear axle gearbox to be switched from a neutral gear to a target gear, and the whole vehicle controller exits from the current limiting zone; and during the activation period of the current limit zone bit, the whole vehicle controller controls the working current of the rear axle driving motor to be smaller than the limit current.
Specifically, when the rotation speed of the rear axle driving motor is adjusted to the target rotation speed, the condition of gear switching of the rear axle gearbox is met, and at the moment, the rear axle controller controls the rear axle gearbox to be switched from neutral gear to the target gear, so that the gear switching of the rear axle is completed. At the same time, the whole vehicle controller exits the current limit flag bit, and stops limiting the current of the rear axle driving motor.
For example, after the rear axle controller controls the rear axle gearbox to switch from neutral gear to the target gear, the shift flag is exited, and the rear axle gearbox can not switch gears any more.
For example, when the rotation speed of the rear axle driving motor is adjusted to the target rotation speed, the rear axle controller exits the rotation speed control flag bit, and the rear axle driving motor completes the adjustment of the rotation speed.
During the period that the whole vehicle controller activates the current limiting zone bit, the whole vehicle controller can limit the working current of the rear axle driving motor, so that the phenomenon that the battery is over-current due to overlarge current in the speed regulation process of the rear axle driving motor is avoided, and the effect of protecting the battery is achieved.
Fig. 2 is a schematic flow chart of a rear axle gear shift control method according to an embodiment of the application. As shown in fig. 2, step S1001 to step S1003 are further included before step S101.
In step S1001, the vehicle controller determines a target gear according to the vehicle speed and the rear axle torque request.
Specifically, the vehicle controller analyzes parameters such as the speed of the vehicle and the rear axle torque request, and can determine the target gear.
In step S1002, when the target gear is different from the current gear of the rear axle gearbox and the front axle is not shifted, the whole vehicle controller reduces the torque and the torque distribution coefficient of the rear axle driving motor.
Specifically, when the target gear is different from the current gear of the rear axle gearbox, the vehicle is required to shift gears. If the front axle is not in a gear shifting state, the rear axle can shift gears. When the current condition of the vehicle meets the rear axle gear shifting, the whole vehicle controller reduces the torque and the torque distribution coefficient of the rear axle driving motor.
In step S1003, when the torque of the rear axle driving motor and the torque distribution coefficient both meet the preset conditions, the whole vehicle controller sends a shift request to the rear axle controller.
Specifically, when the torque and the torque distribution coefficient of the rear axle driving motor meet preset conditions, the rear axle can meet the gear shifting conditions, and at the moment, the whole vehicle controller sends a gear shifting request to the rear axle controller, so that the rear axle shifts gears.
It should be noted that, designer can set up the condition of predetermineeing according to actual demand to make rear axle driving motor's moment of torsion and torque distribution coefficient when meeting the condition of predetermineeing, whole car controller can send the shift request to the rear axle driver. For example, when the torque of the rear axle drive motor and the torque distribution coefficient are both zero or near zero, the vehicle controller sends a shift request to the rear axle controller.
In order to clearly describe the specific operation flow of the above-mentioned rear axle gear shift control method, the following description will be made with reference to fig. 3.
(1) The whole vehicle controller sends a gear shifting request to the rear axle controller, the whole vehicle controller activates the current limiting zone bit, and the rear axle controller activates the gear shifting zone bit.
(2) When the shift flag is activated, the rear axle gearbox is switched from the 2 nd gear to the neutral gear.
(3) When the rear axle gearbox is switched to neutral gear, the rear axle controller activates a rotating speed control zone bit;
(4) And after the rotation speed control zone bit is activated, the rear axle driving motor adjusts the rotation speed to the target rotation speed.
(5) When the rotating speed of the rear axle driving motor is the target rotating speed, the rear axle gearbox is switched from neutral gear to 1 gear, the rear axle controller exits the rotating speed control zone bit, and the whole vehicle controller exits the current limiting zone bit.
(6) And after the rear axle gearbox is switched to 1 gear, the rear axle controller exits the gear shift zone.
The rear axle gear is switched through the steps (1) to (6), in the process of switching the rear axle gear, the current limiting zone bit is always in an activated state during the period that the rotation speed of the rear axle driving motor is regulated to the target rotation speed, and at the moment, the whole vehicle controller controls the working current of the rear axle driving motor to be smaller than the limiting current, so that the phenomenon that the battery is over-current due to overlarge current in the speed regulation process of the rear axle driving motor is avoided, and the effect of protecting the battery is achieved.
Fig. 4 shows a schematic block diagram of a rear axle gear shift control system according to an embodiment of the present application. Referring to fig. 4, the rear axle shift control system includes a whole vehicle controller 41, a rear axle controller 42, a rear axle gearbox 43, and a rear axle drive motor 44.
The vehicle controller 41 is configured to send a shift request to the rear axle controller 42 and activate a current limit flag bit. The rear axle controller 42 is configured to control the rear axle gearbox 43 to be shifted from the current gear to the neutral gear upon receiving a shift request. The vehicle controller 41 is further configured to calculate a limiting current of the rear axle driving motor 44 when the current limiting flag is activated. The rear axle controller 42 is also configured to control the rear axle drive motor 44 to adjust the rotational speed to a target rotational speed when the rear axle gearbox 43 is shifted from the current gear to the neutral gear. The vehicle controller 41 is further configured to exit the current limit flag bit when the rotational speed of the rear axle driving motor 44 is adjusted to the target rotational speed. The vehicle controller 41 is further configured to control the rear axle driving motor 44 to operate with a current less than the limiting current during the activation of the current limiting flag. The rear axle controller 42 is also configured to control the rear axle gearbox 43 to be shifted from neutral to the target gear when the rotational speed of the rear axle drive motor 44 is adjusted to the target rotational speed.
In the rear axle gear shifting process, the whole vehicle controller 41 calculates the limiting current of the rear axle driving motor 44 and controls the working current of the rear axle driving motor 44 to be smaller than the limiting current, so that the problem of battery overcurrent caused by overlarge current of the rear axle driving motor 44 is prevented.
In one embodiment of the present application, the vehicle controller 41 is further configured to determine the target gear according to the vehicle speed and the rear axle torque request. The vehicle controller 41 is further configured to reduce the torque and the torque distribution coefficient of the rear axle driving motor 44 when the target gear is different from the current gear of the rear axle gearbox 43 and the front axle is not shifted. The vehicle controller 41 is further configured to send a shift request to the rear axle controller 42 when the torque and the torque distribution coefficient of the rear axle driving motor 44 both satisfy preset conditions.
In one embodiment of the present application, the whole vehicle controller 41 is further configured to obtain a maximum discharge current of the battery, an operating current of the front axle driving motor, an operating current of the front axle engine, an operating current of the rear axle generator, and an operating current of the high voltage accessory; wherein, the high-voltage accessory at least comprises a compressor, a heater and a power supply device. The vehicle controller 41 is further configured to calculate the limiting current according to a maximum discharge current of the battery, an operating current of the front axle driving motor, an operating current of the front axle engine, an operating current of the rear axle generator, and an operating current of the high-voltage accessory.
In one embodiment of the present application, the rear axle controller 42 is further configured to activate a shift flag when a shift request is sent to the rear axle controller 42. The rear axle gearbox 43 is used for switching the current gear to neutral according to the shift flag. The rear axle controller 42 is also configured to exit the shift flag after the rear axle gearbox 43 is shifted from neutral to the target gear.
The application also discloses a vehicle comprising the rear axle gear shifting control system, wherein the vehicle is used for calculating the limiting current of the rear axle driving motor and controlling the working current of the rear axle driving motor to be smaller than the limiting current in the rear axle gear shifting process, so that the problem of overcurrent of a battery caused by overlarge working current of the rear axle driving motor is prevented.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A rear axle shift control method, characterized by comprising:
the whole vehicle controller sends a gear shifting request to the rear axle controller and activates a current limiting flag bit;
when the rear axle controller receives the gear shifting request, the rear axle gearbox is controlled to be switched from the current gear to the neutral gear;
when the whole vehicle controller activates the current limiting zone bit, the whole vehicle controller calculates the limiting current of the rear axle driving motor;
when the rear axle gearbox is switched from the current gear to the neutral gear, the rear axle controller controls the rear axle driving motor to adjust the rotating speed to the target rotating speed;
when the rotating speed of the rear axle driving motor is regulated to the target rotating speed, the rear axle controller controls the rear axle gearbox to be switched from neutral gear to target gear, and the whole vehicle controller exits from the current limiting zone; and during the activation period of the current limit flag bit, the whole vehicle controller controls the working current of the rear axle driving motor to be smaller than the limit current.
2. The rear axle shift control method according to claim 1, characterized by further comprising, before the complete vehicle controller sends a shift request to the rear axle controller:
the whole vehicle controller determines the target gear according to the vehicle speed and the rear axle torque request;
when the target gear is different from the current gear of the rear axle gearbox and the front axle is not shifted, the whole vehicle controller reduces the torque and the torque distribution coefficient of the rear axle driving motor;
and when the torque and the torque distribution coefficient of the rear axle driving motor meet preset conditions, the whole vehicle controller sends a gear shifting request to the rear axle controller.
3. The rear axle shift control method according to claim 1 or 2, characterized in that the vehicle controller calculates a limiting current of a rear axle drive motor, comprising:
the vehicle controller obtains the maximum discharge current of the battery, the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory; wherein the high-voltage accessory at least comprises a compressor, a heater and a power supply device;
and the whole vehicle controller calculates and obtains the limiting current according to the maximum discharging current of the battery, the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory.
4. The rear axle shift control method according to claim 1 or 2, characterized in that when the rear axle controller receives the shift request, it controls the rear axle gearbox to be shifted from the current gear to the neutral gear, comprising:
when the rear axle controller receives the gear shifting request, a gear shifting zone bit is activated;
the rear axle gearbox switches the current gear to a neutral gear according to the gear shift marker position;
after the rear axle controller controls the rear axle gearbox to be switched from neutral gear to target gear, the method further comprises the following steps:
and the rear axle controller exits the gear shift zone bit.
5. The rear axle shift control method according to claim 1 or 2, characterized in that the rear axle controller controlling the rear axle drive motor to adjust the rotation speed to a target rotation speed, comprising:
the rear axle controller activates a rotating speed control zone bit;
the rear axle driving motor adjusts the rotating speed to a target rotating speed according to the rotating speed control zone bit;
when the rotation speed of the rear axle driving motor is adjusted to the target rotation speed, the method further comprises:
and the rear axle controller exits the rotating speed control zone bit.
6. The rear axle gear shifting control system is characterized by comprising a whole vehicle controller, a rear axle gearbox and a rear axle driving motor;
the whole vehicle controller is used for sending a gear shifting request to the rear axle controller and activating a current limiting zone bit;
the rear axle controller is used for controlling the rear axle gearbox to be switched from the current gear to the neutral gear when the gear shifting request is received;
the whole vehicle controller is also used for calculating the limiting current of the rear axle driving motor when the current limiting zone bit is activated;
the rear axle controller is also used for controlling the rear axle driving motor to adjust the rotating speed to the target rotating speed when the rear axle gearbox is switched from the current gear to the neutral gear;
the whole vehicle controller is also used for exiting the current limit zone bit when the rotating speed of the rear axle driving motor is regulated to the target rotating speed;
the whole vehicle controller is also used for controlling the working current of the rear axle driving motor to be smaller than the limiting current during the activation period of the current limiting zone bit;
the rear axle controller is also used for controlling the rear axle gearbox to be switched from neutral gear to target gear when the rotating speed of the rear axle driving motor is regulated to the target rotating speed.
7. The rear axle shift control system as defined in claim 6, wherein,
the whole vehicle controller is also used for determining the target gear according to the vehicle speed and the rear axle torque request;
the whole vehicle controller is also used for reducing the torque and the torque distribution coefficient of the rear axle driving motor when the target gear is different from the current gear of the rear axle gearbox and the front axle is not shifted;
and the whole vehicle controller is also used for sending a gear shifting request to the rear axle controller when the torque and the torque distribution coefficient of the rear axle driving motor meet preset conditions.
8. The rear axle shift control system as defined in claim 6, wherein,
the whole vehicle controller is also used for obtaining the maximum discharge current of the battery, the working current of the front axle driving motor, the working current of the front axle engine, the working current of the rear axle generator and the working current of the high-voltage accessory; wherein the high-voltage accessory at least comprises a compressor, a heater and a power supply device;
the vehicle controller is further configured to calculate the limiting current according to a maximum discharge current of the battery, a working current of the front axle driving motor, a working current of the front axle engine, a working current of the rear axle generator, and a working current of the high-voltage accessory.
9. The rear axle shift control system as defined in claim 6, wherein,
the rear axle controller is further used for activating a gear shift zone bit when the gear shift request is sent to the rear axle controller;
the rear axle gearbox is used for switching the current gear to a neutral gear according to the gear shift zone;
the rear axle controller is also used for exiting the gear shift zone after the rear axle gearbox is switched from neutral gear to a target gear.
10. A vehicle comprising a rear axle shift control system as claimed in any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210237595.7A CN115217952B (en) | 2022-03-10 | 2022-03-10 | Rear axle gear shifting control method and system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210237595.7A CN115217952B (en) | 2022-03-10 | 2022-03-10 | Rear axle gear shifting control method and system and vehicle |
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| CN115217952A CN115217952A (en) | 2022-10-21 |
| CN115217952B true CN115217952B (en) | 2023-09-22 |
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| WO2014027153A1 (en) * | 2012-08-16 | 2014-02-20 | Peugeot Citroen Automobiles Sa | Method for limiting the torque of an electric machine of a hybrid vehicle comprising a speed control system |
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| CN108312896A (en) * | 2018-02-23 | 2018-07-24 | 北京理工大学 | Adaptively pre- speed governing keeps off dynamic coupling device and its control method more for a kind of bi-motor |
| JP2021000881A (en) * | 2019-06-20 | 2021-01-07 | いすゞ自動車株式会社 | Control device, control method, and control program |
| CN112303223A (en) * | 2020-10-29 | 2021-02-02 | 重庆长安汽车股份有限公司 | Method for controlling rear axle clutch of hybrid electric vehicle |
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| WO2014027153A1 (en) * | 2012-08-16 | 2014-02-20 | Peugeot Citroen Automobiles Sa | Method for limiting the torque of an electric machine of a hybrid vehicle comprising a speed control system |
| CN105179682A (en) * | 2015-08-25 | 2015-12-23 | 重庆长安汽车股份有限公司 | Gear shifting control method and system of two-gear speed-changing vehicle |
| CN108312896A (en) * | 2018-02-23 | 2018-07-24 | 北京理工大学 | Adaptively pre- speed governing keeps off dynamic coupling device and its control method more for a kind of bi-motor |
| JP2021000881A (en) * | 2019-06-20 | 2021-01-07 | いすゞ自動車株式会社 | Control device, control method, and control program |
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| CN115217952A (en) | 2022-10-21 |
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