CN111098847B - Control method and system for series-connection switching and series-parallel connection mode and vehicle - Google Patents
Control method and system for series-connection switching and series-parallel connection mode and vehicle Download PDFInfo
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- CN111098847B CN111098847B CN201811246490.8A CN201811246490A CN111098847B CN 111098847 B CN111098847 B CN 111098847B CN 201811246490 A CN201811246490 A CN 201811246490A CN 111098847 B CN111098847 B CN 111098847B
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- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
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Abstract
The invention provides a control method for a series-parallel mode switching of a vehicle, which comprises the steps of receiving a series-parallel mode switching signal, and acquiring a first rotating speed difference value of the rotating speed of an engine and the rotating speed of an input shaft of a speed change device; further obtaining a first power generation torque of the generator; adjusting the power generation torque of the generator according to the first power generation torque of the generator; so that the engine speed is adjusted and when it reaches the target speed range, the clutch between the engine and the transmission is controlled to be engaged. Therefore, in the series-parallel mode switching process, the rotating speed of the engine is adjusted to the target rotating speed range, and then the clutch is combined, so that the dragging feeling caused by the fact that the rotating speed of the engine is inconsistent with the rotating speed of the input shaft of the speed change device is improved to a certain extent, and the smoothness of the vehicle in the series-parallel mode switching process is improved.
Description
Technical Field
The invention belongs to the technical field of vehicle control, and particularly relates to a control method and system for series switching of a series-parallel mode and a vehicle.
Background
With the increasing awareness of environmental protection, hybrid vehicles are becoming more and more popular in everyday life. The inventor finds that the existing hybrid vehicle generally has a series connection driving mode and a series-parallel connection driving mode, in the series connection driving mode, a clutch between an engine and a driving shaft is disconnected, the engine drives a generator to generate electricity, and a motor drives the vehicle to run; in the series-parallel mode, the clutch between the engine and the transmission is engaged and the engine output power participates in the vehicle drive. The inventor finds that in the switching process of the series mode and the parallel mode, the rotation speed of an engine is inconsistent with the rotation speed of an input shaft of a speed change device, and the difference between the rotation speed of the engine and the rotation speed of the input shaft of the speed change device is overlarge, so that dragging feeling is generated in the clutch combination process between the engine and a driving shaft, and the smoothness of a vehicle is poor.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a control method for switching a series-parallel mode of a vehicle in series, which aims to solve the defects in the prior art to a certain extent. The control method for switching the series-parallel mode of the vehicle provided by the embodiment of the invention comprises the following steps:
receiving a series-parallel mode switching signal, and acquiring a first rotating speed difference value between the rotating speed of an engine and the rotating speed of an input shaft of a speed changing device;
obtaining a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and obtaining a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration;
adjusting the power generation torque of the generator to a first power generation torque of the generator, so that the rotating speed of the engine is adjusted according to the first rotating speed acceleration;
judging whether the rotating speed of the engine reaches a target rotating speed range or not, and sending a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range;
and controlling the clutch between the engine and the speed change device to be combined according to the clutch combination signal.
According to the control method for the series-parallel mode switching of the vehicle provided by the embodiment of the invention, when a series-parallel mode switching signal is received, a first speed difference value between the engine speed and the speed of an input shaft of the speed changing device is firstly obtained, a first speed acceleration is obtained according to a preset corresponding relation between the first speed acceleration and the first speed difference value, and a first power generation torque of the generator is further obtained according to a preset corresponding relation between the first power generation torque of the generator and the first speed acceleration. And adjusting the power generation torque of the generator according to the obtained first power generation torque of the generator, so that the rotating speed of the engine is adjusted according to the first rotating speed acceleration. And judging whether the rotating speed of the engine reaches the target rotating speed range. When the rotating speed of the engine reaches the target rotating speed range, a clutch combination signal is sent out, and the clutch combination between the engine and the speed changing device is controlled according to the signal. Thereby, the mode switching from series to series-parallel is completed. According to the technical method provided by the embodiment of the invention, in the series-parallel mode switching process, the dragging feeling caused by the inconsistency between the rotating speed of the engine and the rotating speed of the input shaft of the speed change device is improved to a certain extent by adjusting the rotating speed of the engine to the target rotating speed range and combining the clutches, and the smoothness of the vehicle in the series-parallel mode switching process is improved.
The embodiment of the invention also provides a control system for switching the series-parallel mode of the vehicle, which comprises,
the acquisition module is used for receiving the series-connection switching series-parallel mode signal and acquiring a first rotating speed difference value between the rotating speed of the engine and the rotating speed of an input shaft of the speed changing device;
the calculation module is used for obtaining a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and obtaining a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration;
the adjusting module is used for adjusting the power generation torque of the generator to a first power generation torque of the generator so that the rotating speed of the engine is adjusted according to the first rotating speed acceleration;
the judging module is used for judging whether the rotating speed of the engine reaches a target rotating speed range or not and sending a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range;
and the control module is used for controlling the clutch combination between the engine and the speed change device according to the clutch combination signal.
According to the control system for the series-connection switching parallel-serial mode of the vehicle, when the acquisition module receives the series-connection switching parallel-serial mode signal, a first rotating speed difference value of the rotating speed of an engine and the rotating speed of an input shaft of a speed changing device is further acquired; the calculation module obtains a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and further obtains a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration. The adjusting module adjusts the power generation torque of the generator according to the obtained first power generation torque of the generator, so that the rotating speed of the engine is adjusted according to the first rotating speed acceleration. The judgment module judges whether the engine speed reaches a target speed range. When the rotating speed of the engine reaches the target rotating speed range, a clutch combination signal is sent out, and the control module controls the clutch between the engine and the speed changing device to be combined according to the signal. Thereby, the switching of the vehicle series to the series-parallel mode is completed. According to the control system for the series-parallel mode switching of the vehicle, provided by the embodiment of the invention, in the series-parallel mode switching process, the rotating speed of the engine is adjusted to the target rotating speed range through the adjusting module, and the control module is combined with the clutch, so that the dragging feeling caused by the fact that the rotating speed of the engine is inconsistent with the rotating speed of the input shaft of the speed changing device is improved to a certain extent, and the smoothness of the vehicle in the series-parallel mode switching process is improved.
The embodiment of the invention also provides a vehicle which comprises the control system for switching the series-parallel mode of the vehicle in series. According to the vehicle provided by the embodiment of the invention, in the process of switching the series-parallel mode, the rotating speed of the engine is adjusted to the target rotating speed range through the adjusting module, the control module controls the combination of the clutch between the engine and the input shaft of the speed change device, the dragging feeling caused by the fact that the rotating speed of the engine is inconsistent with the rotating speed of the input shaft of the speed change device in the switching process of the series-parallel mode is improved to a certain extent, and the smoothness of the vehicle in the switching process of the series-parallel mode is improved.
Drawings
FIG. 1 is a flowchart of a method for controlling a series-parallel mode of vehicle switching in accordance with an embodiment of the present invention;
FIG. 2 is a block diagram of a control system for switching series-parallel modes of a vehicle in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of a vehicle in accordance with an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Hybrid vehicles are becoming more and more common in our everyday lives. The inventor finds that hybrid vehicles generally include both series and series-parallel drive modes, in which the engine outputs power to a generator to generate electricity, and the electricity generated by the generator is provided to a motor or a power battery. The electric motor drives the vehicle to run by utilizing the electric energy output power provided by the generator or the power battery. In the series-parallel mode, the engine outputs power to drive the vehicle, and the whole vehicle control unit determines whether the motor needs to be started or not according to the power required by a driver and outputs power to drive the vehicle to run together with the engine. The power output by the engine can be used for driving the vehicle to run, and part of the power can be output to the generator to generate power. The inventor finds that in the series-switching parallel-series connection process of the prior art, due to the fact that the rotating speed of an engine is inconsistent with the input rotating speed of a speed changing device, dragging feeling can be generated in the clutch combination process between the engine and a driving shaft, and smoothness of a vehicle in the series-switching parallel-series connection process is poor.
In view of the above, the inventor provides a technical solution, which can improve the deficiencies in the prior art to some extent.
As shown in fig. 1, an embodiment of the present invention provides a control method for a series-parallel switching mode of a vehicle, including the following steps:
receiving a series-parallel mode switching signal, and acquiring a first rotating speed difference value between the rotating speed of an engine and the rotating speed of an input shaft of a speed changing device;
obtaining a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and obtaining a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration;
adjusting the power generation torque of the generator to a first power generation torque of the generator, so that the rotating speed of the engine is adjusted according to a first rotating speed acceleration;
judging whether the rotating speed of the engine reaches a target rotating speed range or not, and sending a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range;
and controlling clutch connection between the engine and the speed change device according to the clutch connection signal.
Specifically, the serial-to-serial switching parallel-serial mode signal is received first. At this time, the vehicle is in the series mode, and the clutch between the engine and the transmission is in the disconnected state. The output power of the engine drives the generator to generate electricity. The generator may be a BSG motor. The electricity generated by the generator is provided to a motor or a power battery. The motor outputs power to drive the vehicle to run by utilizing electricity provided by the generator or the power battery. Thus, the output power of the engine is provided to the generator, and the generator converts the output power into electric energy to be provided to the motor or the power battery. The electric motor converts the electric energy into power to drive the vehicle to run.
In the series mode, the power generation torque of the generator is equal to the output torque of the engine, and the power generation torque of the generator starts to be adjusted after the series-parallel switching mode signal is received. Generally, to reduce the generator torque, the output torque of the engine is greater than the generator torque, and the excess torque produces a first rotational acceleration, so that the rotational speed of the engine is rapidly increased.
Specifically, a first speed difference value between the engine speed and the speed of the input shaft of the transmission is obtained, and after the first speed difference value is obtained, a first speed acceleration is obtained according to a preset corresponding relation between a first speed acceleration and the first speed difference value. After the first rotating speed acceleration is obtained, the first generating torque of the generator matched with the target rotating speed acceleration is obtained according to the preset corresponding relation between the first generating torque of the generator and the first rotating speed acceleration, and the adjustment of the generating torque of the generator is adjusted according to the first generating torque of the generator, namely the generating torque of the generator is adjusted to the first generating torque of the generator. So that the rotational speed adjustment of the engine is adjusted according to the first rotational speed acceleration.
The first rotating speed acceleration is an optimal rotating speed acceleration which is an optimal rotating speed acceleration on the basis of the current rotating speed difference, and the target rotating speed acceleration can ensure that the adjustment of the rotating speed of the engine achieves the best effect and cannot cause adverse effects, such as sudden change of the generating power of the generator and other adverse effects. The engine speed is adjusted according to the target rotational speed acceleration.
The first power generation torque of the generator can be a fixed value, namely after a series-connection switching series-parallel mode signal is received, a first rotation speed acceleration is obtained through an obtained first rotation speed difference value between the rotation speed of the engine and the rotation speed of the input shaft of the speed changing device, the first power generation torque of the generator is obtained according to a preset corresponding relation between the first rotation speed acceleration and the first rotation speed difference value, and the power generation torque of the generator is controlled to be equal to the first power generation torque of the generator until the rotation speed of the engine reaches a target rotation speed range, or the rotation speed of the engine is equal to the rotation speed of the input shaft of the speed changing device.
The first power generation torque of the generator may also be a variable, because the difference between the engine speed and the first speed of the input shaft of the transmission changes after the engine speed is adjusted according to the current first speed acceleration, so that the first power generation torque of the generator obtained according to the preset corresponding relationship between the first power generation torque of the generator and the first speed acceleration changes, and at this time, the power generation torque of the generator is adjusted according to the changed first power generation torque of the generator. The rotating speed of the engine is constantly changed and adjusted when the rotating speed of the engine does not reach the target rotating speed range, so that a first rotating speed difference value between the engine and the input shaft of the speed changing device is constantly changed, and further, a first generating torque of the generator obtained according to a preset corresponding relation between the first generating torque of the generator and the first rotating speed acceleration is constantly changed. Therefore, in the process of adjusting the engine power generation torque according to the generator first power generation torque, the first rotational speed acceleration is changed, and the generator first power generation torque is changed until the engine rotational speed reaches the target rotational speed range. Therefore, the first rotating speed acceleration during the rotating speed adjustment of the engine is always matched with the difference value between the current rotating speed of the engine and the rotating speed of the input shaft of the speed changing device, and the stability of the rotating speed adjustment process of the engine is ensured.
And judging whether the rotating speed of the engine reaches a target rotating speed range, sending a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range, controlling the combination of a clutch between the engine and the speed change device according to the clutch combination signal, and enabling the vehicle to enter a series-parallel driving mode.
Wherein the target rotation speed range is a preset rotation speed range related to the rotation speed of the input shaft of the transmission. The target rotating speed range ensures that when a clutch between the engine and the speed change device is combined, gear connection of the engine and the input shaft of the speed change device and rapid synchronization of the rotating speed can be rapidly and stably completed, dragging feeling caused by inconsistency of the rotating speed of the engine and the rotating speed of the input shaft of the speed change device is improved to a certain extent, and smoothness of a vehicle in a series-parallel mode switching process is improved. According to the technical method provided by the embodiment of the invention, in the series-parallel mode switching process, the dragging feeling caused by the inconsistency between the rotating speed of the engine and the rotating speed of the input shaft of the speed change device is improved to a certain extent by adjusting the rotating speed of the engine to the target rotating speed range and combining the clutches, and the smoothness of the vehicle in the series-parallel mode switching process is improved.
In the control method for switching the series-parallel mode of the vehicle according to the embodiment of the present invention, the preset corresponding relationship between the first rotational speed acceleration and the first rotational speed difference is,
if the first speed difference is less than or equal to v1, the first speed acceleration is a1, if the first speed difference is greater than or equal to v2, the first speed acceleration is a2, if the first speed difference is greater than v1 and less than v2, the first speed acceleration increases with an increase in the first speed difference, and the first speed acceleration is greater than a1 while being less than a 2; wherein a1 is less than or equal to a 2.
Specifically, the control method of the series-parallel connection switching mode of the vehicle of the embodiment of the invention, according to the preset correspondence relationship of the first rotational speed acceleration and the first rotational speed difference value, if the first rotational speed difference value is less than or equal to v1, the first rotational speed acceleration is a1, if the first rotational speed difference value is greater than or equal to v2, the first rotational speed acceleration is a2, if the first rotational speed difference value is greater than v1 and less than v2, the first rotational speed acceleration increases with the increase of the first rotational speed difference value, and the first rotational speed acceleration is greater than a1 and is less than a 2.
In the control method for switching the series-parallel mode of the vehicle according to the embodiment of the present invention, the preset corresponding relationship between the first generating torque of the generator and the first rotational speed acceleration is,
tbsg1= (Te-Je dwe/dt1)/Ibsg, Tbsg1 is first generator torque of the generator, Te is engine torque, Je is engine inertia, dwe/dt1 is first rotational speed acceleration, and Ibsg is generator speed ratio.
Specifically, in the control method for switching the series-parallel mode of the vehicle according to the embodiment of the present invention, the first power generation torque of the generator may be obtained by the following preset correspondence relationship,
tbsg1= (Te-Je dwe/dt1)/Ibsg, Tbsg1 is first generator torque of the generator, Te is engine torque, Je is engine inertia, dwe/dt1 is first rotational speed acceleration, and Ibsg is generator speed ratio.
The control method for switching the series-parallel mode of the vehicle according to the embodiment of the invention further comprises the following steps after controlling the clutch between the engine and the speed change device to be combined according to the clutch combination signal:
adjusting the power generation torque of the generator to be zero, and adjusting the transmission torque of the clutch to enable the rotating speed of the engine to be adjusted according to a second rotating speed acceleration, wherein the second rotating speed acceleration is obtained according to a preset corresponding relation between the second rotating speed acceleration and the transmission torque of the clutch;
and acquiring a second rotation speed difference value between the rotation speed of the engine and the rotation speed of the input shaft of the speed changing device, and adjusting the transmission torque of the clutch to be equal to the engine torque when the second rotation speed difference value is zero.
Specifically, the control method for switching the series-parallel mode of the vehicle in series according to the embodiment of the invention sends out a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range, adjusts the generating torque of the generator to be zero according to the clutch combination signal, and controls the clutch combination between the engine and the speed changing device. Meanwhile, the transmission torque of the clutch is adjusted, so that the rotating speed of the engine is adjusted, and the rotating speed synchronization of the engine and the input shaft of the speed change device is completed. Wherein the acceleration of the engine speed adjustment is a second rotational speed acceleration, which can be obtained by,
and obtaining a second rotating speed acceleration according to the corresponding relation between the preset second rotating speed acceleration and the transmission torque of the clutch, and adjusting the rotating speed of the engine according to the second rotating speed acceleration.
And further judging a difference value between the engine speed and a second speed of the input shaft of the speed changing device, and adjusting the transmission torque of the clutch to be equal to the engine torque when the difference value of the second speed is zero. Thereby, the synchronization of the engine and the rotation speed of the input shaft of the transmission is completed.
In the control method for switching the series-parallel mode of the vehicle according to the embodiment of the present invention, the preset corresponding relationship between the second rotational speed acceleration and the transmission torque of the clutch is,
dwe/dt2= (Te-Tc)/Je, dwe/dt2 is the second rotational speed acceleration, Te is the engine torque, Tc is the transmission torque of the clutch, and Je is the engine inertia.
Specifically, the control method for switching the series-parallel mode of the vehicle according to the embodiment of the invention gives the corresponding relationship between the second rotational speed acceleration and the transmission torque of the clutch, as shown below,
dwe/dt2= (Te-Tc)/Je, dwe/dt2 is the second rotational speed acceleration, Te is the engine torque, Tc is the clutch transmission torque, and Je is the engine inertia.
In this way, a second rotational speed acceleration can be obtained from the clutch transmission torque, and the engine rotational speed can be adjusted according to the second rotational speed acceleration.
An embodiment of the present invention further provides a control system for switching a series-parallel mode of a vehicle in series, as shown in fig. 2, including,
the acquisition module is used for receiving the series-connection switching series-parallel mode signal and acquiring a first rotating speed difference value between the rotating speed of the engine and the rotating speed of an input shaft of the speed changing device;
the calculation module is used for obtaining a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and obtaining a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration;
the adjusting module is used for adjusting the power generation torque of the generator to a first power generation torque of the generator so that the rotating speed of the engine is adjusted according to a first rotating speed acceleration;
the judging module is used for judging whether the rotating speed of the engine reaches a target rotating speed range or not and sending a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range;
and the control module is used for controlling the clutch combination between the engine and the speed change device according to the clutch combination signal.
Specifically, the control system for the series-connection switching parallel-series mode of the vehicle provided by the embodiment of the invention further obtains a first rotating speed difference value between the rotating speed of the engine and the rotating speed of the input shaft of the speed change device when the acquisition module receives the series-connection switching parallel-series mode signal; the calculation module obtains a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and further obtains a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration. The adjusting module adjusts the power generation torque of the generator according to the obtained first power generation torque of the generator, so that the rotating speed of the engine is adjusted according to the first rotating speed acceleration. The judgment module judges whether the engine speed reaches a target speed range. When the rotating speed of the engine reaches the target rotating speed range, a clutch combination signal is sent out, and the control module controls the clutch between the engine and the speed changing device to be combined according to the signal. Thereby, the switching of the vehicle series to the series-parallel mode is completed. According to the control system for the series-parallel mode switching of the vehicle, provided by the embodiment of the invention, in the series-parallel mode switching process, the rotating speed of the engine is adjusted to the target rotating speed range through the adjusting module, and the control module is combined with the clutch, so that the dragging feeling caused by the fact that the rotating speed of the engine is inconsistent with the rotating speed of the input shaft of the speed changing device is improved to a certain extent, and the smoothness of the vehicle in the series-parallel mode switching process is improved.
In the control system for switching the series-parallel mode of the vehicle provided by the embodiment of the invention, the preset corresponding relationship between the first rotating speed acceleration and the first rotating speed difference is,
if the first speed difference is less than or equal to v1, the first speed acceleration is a1, if the first speed difference is greater than or equal to v2, the first speed acceleration is a2, if the first speed difference is greater than v1 and less than v2, the first speed acceleration increases with an increase in the first speed difference, and the first speed acceleration is greater than a1 while being less than a 2; wherein a1 is less than or equal to a 2.
Specifically, the control system of the series-parallel switched mode of vehicle of the embodiment of the invention, according to the preset correspondence relationship of the first rotational speed acceleration and the first rotational speed difference value, if the first rotational speed difference value is less than or equal to v1, the first rotational speed acceleration is a1, if the first rotational speed difference value is greater than or equal to v2, the first rotational speed acceleration is a2, if the first rotational speed difference value is greater than v1 and less than v2, the first rotational speed acceleration increases with the increase of the first rotational speed difference value, and the first rotational speed acceleration is greater than a1 and is less than a 2.
In the control system for switching the series-parallel mode of the vehicle provided by the embodiment of the invention, the preset corresponding relation between the first generating torque of the generator and the first rotating speed acceleration is,
tbsg1= (Te-Je dwe/dt1)/Ibsg, Tbsg1 is first generator torque of the generator, Te is engine torque, Je is engine inertia, dwe/dt1 is first rotational speed acceleration, and Ibsg is generator speed ratio.
Specifically, in the control system for switching the series-parallel mode of the vehicle according to the embodiment of the present invention, the first power generation torque of the generator may be obtained by the following preset correspondence relationship,
tbsg1= (Te-Je dwe/dt1)/Ibsg, Tbsg1 is first generator torque of the generator, Te is engine torque, Je is engine inertia, dwe/dt1 is first rotational speed acceleration, and Ibsg is generator speed ratio.
According to the control system for switching the series-parallel mode of the vehicle provided by the embodiment of the invention, the generator is a BSG motor.
Specifically, in the control system for switching the series-parallel mode of the vehicle provided by the embodiment of the invention, the generator is a BSG motor. The BSG motor can be used as a generator to convert the output power of the engine into electric energy, and can also be used as a motor to drive the engine to start and drive a vehicle to run.
The embodiment of the invention also provides a vehicle, which comprises the control system for switching the series-parallel mode of the vehicle in series as shown in fig. 3.
According to the vehicle provided by the embodiment of the invention, in the process of switching the series-parallel mode, the rotating speed of the engine is adjusted to the target rotating speed range through the adjusting module, the control module controls the combination of the clutch between the engine and the input shaft of the speed change device, the dragging feeling caused by the fact that the rotating speed of the engine is inconsistent with the rotating speed of the input shaft of the speed change device in the switching process of the series-parallel mode is improved to a certain extent, and the smoothness of the vehicle in the switching process of the series-parallel mode is improved.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Any process or system descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or systems may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those of ordinary skill in the art that all or part of the steps carried by the system to implement the embodiments described above may be implemented by hardware that is configured to be executable by a program to instruct an associated computer to perform the steps of the embodiments of the system.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A control method for switching series-parallel mode of vehicle series connection is characterized by comprising the following steps:
receiving a series-parallel mode switching signal, and acquiring a first rotating speed difference value between the rotating speed of an engine and the rotating speed of an input shaft of a speed changing device;
obtaining a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and obtaining a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration;
adjusting the power generation torque of the generator to a first power generation torque of the generator, so that the rotating speed of the engine is adjusted according to the first rotating speed acceleration;
judging whether the rotating speed of the engine reaches a target rotating speed range or not, and sending a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range;
controlling the clutch between the engine and the speed change device to be combined according to the clutch combination signal;
adjusting the power generation torque of the generator to be zero, and adjusting the transmission torque of the clutch to enable the rotating speed of the engine to be adjusted according to a second rotating speed acceleration, wherein the second rotating speed acceleration is obtained according to a preset corresponding relation between the second rotating speed acceleration and the transmission torque of the clutch;
and acquiring a second rotating speed difference value between the rotating speed of the engine and the rotating speed of the input shaft of the speed changing device, and adjusting the transmission torque of the clutch to be equal to the engine torque when the second rotating speed difference value is zero.
2. The method for controlling a series-parallel mode of vehicle switching in accordance with claim 1, wherein said predetermined first rotational acceleration corresponds to a first rotational speed difference,
if the first speed difference is less than or equal to v1, the first speed acceleration is a1, if the first speed difference is greater than or equal to v2, the first speed acceleration is a2, if the first speed difference is greater than v1 and less than v2, the first speed acceleration increases with an increase in the first speed difference, and the first speed acceleration is greater than a1 while being less than a 2; wherein a1 is less than or equal to a 2.
3. The method as claimed in claim 1, wherein the predetermined relationship between the first generator torque and the first rotational acceleration is,
tbsg1 ═ Te-Je dwe/dt1)/Ibsg, Tbsg1 is the first generator torque, Te is the engine torque, Je is the engine inertia, dwe/dt1 is the first rotational speed acceleration, and Ibsg is the generator speed ratio.
4. The control method for switching the series-parallel mode of a vehicle according to claim 1, wherein the predetermined second rotational speed acceleration is in correspondence with a transmission torque of the clutch,
dwe/dt2 is (Te-Tc)/Je, dwe/dt2 is the second rotational speed acceleration, Te is the engine torque, Tc is the transmission torque of the clutch, and Je is the engine inertia.
5. A control system for switching series-parallel mode of vehicle is characterized by comprising,
the acquisition module is used for receiving the series-connection switching series-parallel mode signal and acquiring a first rotating speed difference value between the rotating speed of the engine and the rotating speed of an input shaft of the speed changing device;
the calculation module is used for obtaining a first rotating speed acceleration according to a corresponding relation between a preset first rotating speed acceleration and a first rotating speed difference value, and obtaining a first generating torque of the generator according to a corresponding relation between a preset first generating torque of the generator and the first rotating speed acceleration;
the adjusting module is used for adjusting the power generation torque of the generator to a first power generation torque of the generator so that the rotating speed of the engine is adjusted according to the first rotating speed acceleration;
the judging module is used for judging whether the rotating speed of the engine reaches a target rotating speed range or not and sending a clutch combination signal when the rotating speed of the engine reaches the target rotating speed range;
the control module is used for controlling the clutch between the engine and the speed change device to be combined according to the clutch combination signal;
the control system for the series-parallel mode switching of the vehicle is further used for adjusting the power generation torque of the generator to be zero and adjusting the transmission torque of the clutch so that the rotating speed of the engine is adjusted according to a second rotating speed acceleration, wherein the second rotating speed acceleration is obtained according to a preset corresponding relation between the second rotating speed acceleration and the transmission torque of the clutch; and acquiring a second rotating speed difference value between the rotating speed of the engine and the rotating speed of the input shaft of the speed changing device, and adjusting the transmission torque of the clutch to be equal to the engine torque when the second rotating speed difference value is zero.
6. The control system for series-parallel switching of a vehicle according to claim 5, wherein the predetermined first rotational speed acceleration corresponds to a first rotational speed difference,
if the first speed difference is less than or equal to v1, the first speed acceleration is a1, if the first speed difference is greater than or equal to v2, the first speed acceleration is a2, if the first speed difference is greater than v1 and less than v2, the first speed acceleration increases with an increase in the first speed difference, and the first speed acceleration is greater than a1 while being less than a 2; wherein a1 is less than or equal to a 2.
7. The control system for controlling the series-parallel connection switching of the vehicle as claimed in claim 5, wherein the preset first generator torque and the first rotational speed acceleration are related in a manner that Tbsg1 is (Te-Je dwe/dt1)/Ibsg, Tbsg1 is the first generator torque of the generator, Te is the engine torque, Je is the engine inertia, dwe/dt1 is the first rotational speed acceleration, and Ibsg is the speed ratio of the generator.
8. The vehicle series switched series-parallel mode control system of claim 5, wherein said generator is a BSG motor.
9. A vehicle characterized by comprising the control system for vehicle series-switching series-parallel mode of any one of claims 5 to 8.
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| CN114347980B (en) * | 2020-10-13 | 2023-08-18 | 长城汽车股份有限公司 | Method and device for switching vehicle running modes and automobile |
| CN113335262B (en) * | 2021-07-19 | 2022-08-23 | 中国第一汽车股份有限公司 | Control method for switching drive modes of hybrid electric vehicle, vehicle and storage medium |
| CN114763132A (en) * | 2021-07-21 | 2022-07-19 | 长城汽车股份有限公司 | Control method, device, medium, and apparatus for hybrid vehicle |
| CN114030460B (en) * | 2021-11-09 | 2023-10-03 | 东风汽车集团股份有限公司 | Torque control method and device for hybrid electric vehicle |
| CN114394080B (en) * | 2022-01-26 | 2023-11-24 | 浙江吉利控股集团有限公司 | Hybrid vehicle, mode switching control method and device thereof, and storage medium |
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