CN113104020A - Hybrid electric vehicle and power control mode decision method and device thereof - Google Patents
Hybrid electric vehicle and power control mode decision method and device thereof Download PDFInfo
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Abstract
The invention discloses a hybrid electric vehicle and a power control mode decision method and a power control mode decision device thereof, wherein the hybrid electric vehicle is a parallel hybrid electric vehicle, and the decision method comprises the following steps: acquiring a target power control mode of the hybrid electric vehicle according to the whole vehicle mode and the grade of the required torque of the wheel end of the whole vehicle; judging whether the target power control mode is the same as the current power control mode of the hybrid electric vehicle or not; and if the target power control mode is different from the current power control mode, acquiring mode switching information, and switching the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode according to the mode switching information. The decision method can be applied to hybrid electric vehicles with different power system structures to realize the switching of the power control modes, thereby greatly shortening the pre-research period, saving the research and development efforts and reducing the research and development cost of multi-structure vehicle types.
Description
Technical Field
The invention relates to the technical field of hybrid electric vehicles, in particular to a hybrid electric vehicle and a power control mode decision method and device thereof.
Background
The hybrid electric vehicle is a popular research and development product, and the structural diversity of a power system of the hybrid electric vehicle is a main reason that a control system is difficult to develop in a platform mode and the control maturity is low. Hybrid vehicles are generally divided into parallel type, series type and series-parallel type, in order to take high and low speed power systems into consideration, many vehicle enterprises choose to develop parallel type hybrid vehicles, such as a P14 system developed by early Volvo corporation, which belongs to a parallel type hybrid vehicle coupled through electric coupling and ground power, while a P2 hybrid vehicle is a system with less modification and higher control complexity compared with the traditional vehicle, and has the characteristics that the full working condition is better than the traditional vehicle, but the control complexity is higher, in addition, a P134 system developed by Mitsubishi corporation, and a P13 system developed by Honda corporation all belong to the parallel type hybrid vehicles.
The parallel hybrid electric vehicle has various structures, the hybrid electric vehicles independently researched and developed in China have various difficulties, which results in difficulty in selecting which structure is difficult to make, and the selection of the structure influences the positioning, cost, research and development period, the whole vehicle arrangement, the robustness of software development, the difficulty in test verification, supplier resources and the like of products, so that various power control modes of the hybrid electric vehicle can be tried in the pre-research process. Due to the fact that the available power control modes of hybrid electric vehicles with different structures are different, when hybrid electric vehicles with various structures are pre-researched, a mode decision scheme takes a great deal of research and development energy, and the period of a pre-research project is long.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a method for determining a power control mode of a hybrid electric vehicle, which can be applied to hybrid electric vehicles with different power system structures to implement switching of the power control mode, thereby greatly shortening a pre-research period, saving research and development efforts, and reducing research and development costs of multi-structure vehicle types.
The second purpose of the invention is to provide a hybrid electric vehicle power control mode decision device.
A third object of the present invention is to provide a hybrid vehicle.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for determining a power control mode of a hybrid vehicle, where the hybrid vehicle is a parallel hybrid vehicle, and the method includes the following steps: acquiring a target power control mode of the hybrid electric vehicle according to a finished vehicle mode and a finished vehicle wheel end required torque grade; judging whether the target power control mode is the same as the current power control mode of the hybrid electric vehicle or not; and if the target power control mode is different from the current power control mode, acquiring mode switching information, and switching the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode according to the mode switching information.
The method for deciding the power control mode of the hybrid electric vehicle comprises the steps of firstly obtaining a target power control mode of the hybrid electric vehicle according to a finished vehicle mode and a finished vehicle wheel end required torque grade, then judging whether the target power control mode is the same as a current power control mode of the hybrid electric vehicle, and switching the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode when the target power control mode is different from the current power control mode. Therefore, the method can be applied to hybrid electric vehicles with different power system structures to realize the switching of the power control modes, thereby greatly shortening the pre-research period, saving the research and development efforts and reducing the research and development cost of multi-structure vehicle types.
In addition, the hybrid vehicle power control mode decision method according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, acquiring mode switching information and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information includes: judging whether an engine needs to participate when the current power control mode is switched to the target power control mode; if the participation of the engine is not needed, selecting a corresponding first mode switching ID from a first preset mode switching ID library according to the current power control mode and the target power control mode; and performing switching control on the current power control mode according to the selected first mode switching ID.
According to an embodiment of the present invention, acquiring mode switching information and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information, further includes: if the engine is required to participate, judging whether the pure electric mode needs to be switched when the current power control mode is switched to the target power control mode; if the pure electric mode needs to be switched, selecting a corresponding first mode switching ID from the first preset mode switching ID library and selecting a corresponding second mode switching ID from the second preset mode switching ID library according to the current power control mode and the target power control mode; judging whether the possibility of simultaneous execution of the pure electric mode switching and the engine participation mode switching exists; and if the possibility of simultaneous operation exists, respectively performing switching control on the current power control mode according to the selected first mode switching ID and the selected second mode switching ID.
According to an embodiment of the present invention, acquiring mode switching information and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information, further includes: if the possibility of simultaneous operation does not exist, judging whether to switch the pure electric mode or the engine participation mode; if the pure electric mode is switched, firstly, switching control is carried out on the current power control mode according to the selected first mode switching ID, and then switching control is carried out on the current power control mode according to the selected second mode switching ID; if the engine participation mode is switched first, the current power control mode is switched and controlled according to the selected second mode switching ID, and then the current power control mode is switched and controlled according to the selected second mode switching ID.
According to an embodiment of the present invention, acquiring mode switching information and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information, further includes: judging whether the mode switching is completed; if the mode switching is not finished, judging whether the mode switching time is greater than or equal to a first preset time or not, or whether mode switching failure information is received or not; if the mode switching time is greater than or equal to the first preset time or mode switching failure information is received, ending the mode switching and executing mode resetting operation; after the mode is reset, whether the hybrid electric vehicle has a power control mode switching requirement is detected, and when the hybrid electric vehicle has the power control mode switching requirement, a target power control mode of the hybrid electric vehicle is obtained.
According to one embodiment of the invention, the obtaining of the target power control mode of the hybrid electric vehicle according to the vehicle mode and the vehicle wheel end required torque level further comprises: judging whether the hybrid electric vehicle has an overspeed protection function on a motor; if the overspeed protection function for the motor exists, acquiring the current speed of the hybrid electric vehicle; determining a selectable power control mode of the hybrid electric vehicle according to the current vehicle speed; judging whether the target power control mode needs to be replaced or not according to the selectable power control mode; selecting an alternate target power control mode from the alternate power control modes if the primary selection mode requires an alternate.
According to an embodiment of the present invention, acquiring the target power control mode of the hybrid vehicle further includes: determining whether the target power control mode is disabled; if the target power control mode is forbidden, determining an optional power control mode of the hybrid electric vehicle according to the level of the required torque of the whole vehicle wheel end; selecting an alternate one of the target power control modes from the alternate power control modes.
According to one embodiment of the invention, the power control mode of the hybrid electric vehicle comprises a no-power mode, a pure electric rear-drive driving source mode, a pure electric front-drive driving source mode, a pure electric four-drive driving source mode, a series source _ pure electric rear-drive driving source mode, a series source _ pure electric front-drive driving source mode, a series source _ pure electric four-drive driving source mode, a parallel source _ pure electric rear-drive driving source mode, a parallel source _ pure electric front-drive driving source mode and a parallel source _ pure electric four-drive driving source mode.
In order to achieve the above object, a second aspect of the present invention provides a hybrid vehicle power control mode decision device, where the hybrid vehicle is a parallel hybrid vehicle, and the device includes: the first acquisition module is used for acquiring a target power control mode of the hybrid electric vehicle according to a finished vehicle mode and a finished vehicle wheel end required torque level; the judging module is used for judging whether the target power control mode is the same as the current power control mode of the hybrid electric vehicle or not; the second acquisition module is used for acquiring mode switching information when the target power control mode is different from the current power control mode; and the switching module is used for switching the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode according to the mode switching information.
The decision device for the power control mode of the hybrid electric vehicle can be applied to hybrid electric vehicles with different power system structures to realize the switching of the power control mode, so that the pre-research period can be greatly shortened, the research and development efforts can be saved, and the research and development cost of multi-structure vehicle types can be reduced.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides a hybrid vehicle, including a hybrid vehicle power control mode decision device according to the embodiment of the third aspect of the present invention.
According to the hybrid electric vehicle disclosed by the embodiment of the invention, the decision device for the power control mode of the hybrid electric vehicle disclosed by the embodiment of the invention is adopted, so that the switching of the power control mode is realized, the pre-research period can be greatly shortened, the research and development efforts are saved, and the research and development cost of multi-structure vehicle types is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a hybrid vehicle power control mode decision method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining a hybrid vehicle power control mode according to an exemplary embodiment of the present invention;
FIG. 3 is a flow chart of a hybrid vehicle power control mode decision method according to a specific example of the present invention;
FIG. 4 is a timing diagram of the target power control mode, the current power control mode, and the mode switch ID of one example of the present invention;
FIG. 5 is a software architecture diagram of a power control mode decision of an embodiment of the present invention;
FIG. 6 is a block diagram showing the configuration of a hybrid vehicle power control mode decision device according to an embodiment of the present invention;
fig. 7 is a block diagram of a hybrid vehicle according to 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 drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The hybrid electric vehicle and the power control mode decision method and device thereof according to the embodiment of the invention are described below with reference to the accompanying drawings.
It should be understood that in the prior art, the power structure of the parallel hybrid vehicle can be divided into P0, P1, P2, P3 and P4 structures according to the positions of the motors, and if a plurality of motors are in different positions, different combinations can be generated. The P0 structure represents that the motor is arranged at the front end of the engine, and is a common structure of micro-mixing of 48V generally; the P1 structure indicates that the motor is directly connected with the output end of the engine, and is a weak mixing common structure, and the motor cannot be driven independently; the P2 structure represents that the motor is positioned behind the clutch and in front of the input shaft of the gearbox, is directly connected with the input shaft of the gearbox, and is a common strong-mixing structure; the P3 structure shows that the motor is positioned at the rear end of the gearbox and is directly coupled with the output torque of the gearbox through a torque coupling device; the P4 structure shows that the motor is positioned at the rear drive, is not directly coupled with the torque of the engine, realizes the torque output torque coupling through the ground, and is often used in combination with other structures because the P3 and P4 structures cannot adjust the working point of the engine and cannot realize the simultaneous power generation of the output torque of the engine.
The power control modes are defined based on the power system structure, and the mode defining modes of various manufacturers are different, for example, the mode is defined according to the actual power flow and the mode is defined according to the working condition, and the definition decision of the power control modes is too dependent on the system structure. For example, the power control mode of the P2 structure may be defined by energy flow as: pure electric drive, parallel power generation, parallel boosting, direct engine drive and series parking power generation modes, and the P13 structure can be defined as: pure electric drive, parallel power generation, parallel boosting, direct engine drive and series drive modes, and due to the fact that series connection of a P2 structure and series connection of a P13 structure are different in implementation modes (caused by different structures), the use working conditions are different, decision conditions are different in the decision mode, the mode decision scheme is caused to spend a large amount of research and development efforts, the period of a pre-research project is further caused to be longer, and the research and development cost is higher. Based on this, the embodiment of the invention provides a decision method for a power control mode of a hybrid electric vehicle, so as to solve the problems of long pre-research period and high research and development cost.
The hybrid electric vehicle in the embodiment of the invention is a parallel hybrid electric vehicle. Fig. 1 is a flowchart of a method for determining a power control mode of a hybrid vehicle according to an embodiment of the present invention.
As shown in fig. 1, the method for determining the power control mode of the hybrid electric vehicle includes the following steps:
and S1, acquiring a target power control mode of the hybrid electric vehicle according to the vehicle mode and the vehicle wheel end required torque level.
Specifically, in practical applications, the target power control mode of the hybrid electric vehicle is closely related to the current vehicle mode and the vehicle wheel end required torque level, and therefore, the target power control mode needs to be obtained according to the vehicle mode and the vehicle wheel end required torque level to adapt to the current state of the hybrid electric vehicle.
In one embodiment of the present invention, as shown in table 1, the power control mode of the hybrid vehicle includes a no-power source mode (allogen mode), an all-electric rear-drive source mode (ER mode), an all-electric front-drive source mode (EF mode), an all-electric four-drive source mode (E4 mode), a series source mode (SG mode), a series source _ all-electric rear-drive source mode (SG _ ER mode), a series source _ all-electric front-drive source mode (SG _ EF mode), a series source _ all-electric four-drive source mode (SG _ E4 mode), a parallel source mode (HD mode), a parallel source _ all-electric rear-drive source mode (HD _ ER mode), a parallel source _ all-electric front-drive source mode (HD _ EF mode), and a parallel source _ all-electric four-drive source mode (HD _ E4 mode).
The pure electric mode (EV mode) includes an pure electric rear drive source mode (ER mode), an pure electric front drive source mode (EF mode), and an pure electric four drive source mode (E4 mode), and the engine participation mode includes a series source mode (SG mode), a series source _ pure electric rear drive source mode (SG _ ER mode), a series source _ pure electric front drive source mode (SG _ EF mode), a series source _ pure electric four drive source mode (SG _ E4 mode), a parallel source mode (HD mode), a parallel source _ pure electric rear drive source mode (HD _ ER mode), a parallel source _ pure electric front drive source mode (HD _ EF mode), and a parallel source _ pure electric four drive source mode (HD _ E4 mode).
It should be understood that the drive source of the hybrid vehicle includes an engine and a motor, and the above-described power control mode is defined on the basis of a mode definition principle of whether the drive source is connected to the entire wheel end through a transmission system. Specifically, the ALLOPEN mode: no driving source is connected into a transmission system of the hybrid electric vehicle; ER mode: the motor is connected to the rear drive of the hybrid electric vehicle, and the front drive is not connected with any driving source; EF mode: the motor is connected into the front drive of the hybrid electric vehicle, and the rear drive is not connected with any driving source; e4 mode: connecting a motor to a front drive and a rear drive of the hybrid electric vehicle; SG mode: the engine and the motor are connected in series, and the engine works periodically to enable the motor to generate electricity; in the HD mode: the engine and the motor are connected to the transmission system, and the engine is in a running state.
TABLE 1 Power control mode table derived from combination of drive source modes
| HD | SG | EF | ER | Mode(s) |
| 0 | 0 | 0 | 0 | ALLOPEN |
| 0 | 0 | 0 | 1 | |
| 0 | 0 | 1 | 0 | EF |
| 0 | 0 | 1 | 1 | E4 |
| 0 | 1 | 0 | 0 | SG_PG |
| 0 | 1 | 0 | 1 | |
| 0 | 1 | 1 | 0 | |
| 0 | 1 | 1 | 1 | SG_E4 |
| 1 | 0 | 0 | 0 | HD_ICE |
| 1 | 0 | 0 | 1 | HD_ER |
| 1 | 0 | 1 | 0 | HD_EF |
| 1 | 0 | 1 | 1 | HD_E4 |
Specifically, when the hybrid electric vehicle is detected to have a power control mode switching requirement, a target power control mode of the hybrid electric vehicle is acquired, the acquisition of the target power control mode depends on the structure of a whole vehicle power system, so that the target power control mode can be acquired according to the whole vehicle mode and the whole vehicle wheel end required torque level, and the acquired target power control mode is one of an ER mode, an EF mode, an E4 mode, an SG _ ER mode, an SG _ EF mode, an SG _ E4 mode, an HD _ ER mode, an HD _ EF mode and an HD _ E4 mode.
S2, it is determined whether the target power control mode is the same as the current power control mode of the hybrid vehicle.
Specifically, the current power control mode is also one of an ER mode, an EF mode, an E4 mode, an SG _ ER mode, an SG _ EF mode, an SG _ E4 mode, an HD _ ER mode, an HD _ EF mode, and an HD _ E4 mode.
And S3, if the target power control mode is different from the current power control mode, acquiring mode switching information, and switching the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode according to the mode switching information.
It should be noted that the mode switching information includes electric-only mode switching information and/or engine participation mode switching information, so as to switch the electric-only mode and/or the power system structure of the hybrid electric vehicle according to the mode switching information, wherein the power system structure includes a parallel structure and a series structure.
For example, if the target power control mode is the electric-only four-drive source mode (SG _ EF mode) and the current power control mode is the series source _ electric-only front drive source mode (E4 mode), the acquired corresponding mode switching information includes switching information for switching the E4 mode to the EF mode and switching information for connecting the engine and the motor, and the E4 mode is switched to the SG _ EF mode according to the mode switching information. It can be seen that the mode switching information includes both EV mode switching information and powertrain configuration switching information, that is, switching information in which the engine participates.
In this step, if the target power control mode is the same as the current power control mode, the process returns to step S1, so as to obtain the target power control mode when it is detected that the hybrid electric vehicle has a power control mode switching requirement, and the process is repeated in this way, so as to achieve the purpose of timely deciding the power control mode of the hybrid electric vehicle.
That is, regardless of the powertrain structure of the hybrid electric vehicle, the power control mode can be selected and adjusted by the decision method, that is, the hybrid electric vehicles with different powertrain structures can share the decision method to realize the mode decision. Therefore, the power control mode decision method of the power automobile can be applied to hybrid power automobiles with different power system structures to realize the switching of the power control modes, can greatly shorten the pre-research period, save the research and development efforts and reduce the research and development cost of multi-structure automobile types.
In an embodiment of the present invention, as shown in fig. 2, the obtaining of the mode switching information and the switching of the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information, namely, the step S3 may include: judging whether the participation of the engine is needed when the current power control mode is switched to the target power control mode; if the participation of the engine is not needed, selecting a corresponding first mode switching ID from a first preset mode switching ID (Identity Document (which can be expressed as a numerical code with identification) library according to the current power control mode and the target power control mode; and performing switching control on the current power control mode according to the selected first mode switching ID.
Specifically, if the switching does not require the participation of the engine, a corresponding first mode switching ID is selected from a first preset mode switching ID library according to the current power control mode and the target power control mode, so as to perform the electric-only mode switching between the current power control mode and the target power control mode. The first preset mode switching ID library may be a combination of all IDs representing the pure electric mode switching, which are preset and stored by a user.
Specifically, as shown in table 2, the first preset mode switching ID bank may be an EV power mode switching ID bank, which may include 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, and the first mode switching ID may be one of the switching IDs, according to which power control mode switching without engine participation is possible, for example, according to 0x2, the ALLOPEN mode is switched to the EF mode, that is, EV _ MSID _ AO2EF in table 2; the ER mode is switched to the E4 mode according to 0x4, or the SG _ ER mode is switched to the SG _ E4 mode according to 0x4, or the HD _ ER mode is switched to the HD _ E4 mode according to 0x4, i.e., EV _ MSID _ ER2E4 in table 2.
TABLE 2 interface name, meaning and switch ID table of decision algorithm
It should be understood that if one of the target power control mode and the current power control mode is the engine participation mode, or the target power control mode and the current power control mode are two completely different engine participation modes, respectively, i.e., one involving the parallel source mode and the other involving the series source mode, e.g., one involving the HD _ ER mode and the other involving the SG _ EF mode, it can be determined that engine participation is required when the current power control mode is switched to the target power control mode; if the target power control mode and the current power control mode are both the electric-only mode (EV mode), or both the target power control mode and the current power control mode relate to the parallel source mode or both the series source mode, that is, the participation of the engine is the same, for example, the target power control mode is the HD _ EF mode, and the current power control mode is the HD _ ER mode, it may be determined that the participation of the engine is not required when the current power control mode is switched to the target power control mode.
It should be noted that, in a specific example of this embodiment, as shown in fig. 3, when determining whether the target power control mode belongs to the engine participation mode, it may be determined whether the target power control mode has a parallel request first, when there is no parallel request, it may be determined whether there is a series request, and if there is a parallel request or a series request, it may be determined that the target power control mode belongs to the engine participation mode.
Further, referring to fig. 2 and 3, acquiring the mode switching information, and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information, that is, step S3 may further include: if the engine is required to participate, judging whether the pure electric mode needs to be switched when the current power control mode is switched to the target power control mode; if the pure electric mode needs to be switched, selecting a corresponding first mode switching ID from a first preset mode switching ID library and selecting a corresponding second mode switching ID from a second preset mode switching ID library according to the current power control mode and the target power control mode; judging whether the possibility of simultaneous execution of the pure electric mode switching and the engine participation mode switching exists; if there is a possibility of simultaneous operations, the current power control mode is respectively switched and controlled according to the selected first mode switching ID and the selected second mode switching ID at the same time.
It should be appreciated that if engine involvement is required to switch the current power control mode to the target power control mode, there are two switching modes: first, only mode switching requiring engine participation is performed; second, both the purely electric mode and the mode switching that requires the participation of the engine are performed. Therefore, before switching, the switching mode needs to be selected, so as to plan the switching path according to the switching mode, and quickly and simply complete the corresponding mode switching.
Specifically, comparison and analysis between the target power control mode and the current power control mode can be performed to determine which switching mode the switching belongs to, if it is determined that the switching belongs to the second switching mode, that is, the switching needs to be performed both in the participation of the engine and in the purely electric mode, the first mode switching ID is selected from the first preset mode switching ID library, and the second mode switching ID is selected from the second preset mode switching ID library, and in the case that there is a possibility of simultaneous switching, the mode switching is performed simultaneously according to the first mode switching ID and the second mode switching ID, so that the switching efficiency is improved.
Specifically, referring to table 2, the second preset mode switching ID bank may be an engine-related power control mode switching ID bank, and may include 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, and the second mode switching ID is one of switching IDs according to which a power control mode switching requiring engine participation may be performed, for example, an electric only drive source mode (EV mode) is switched to a series source mode (SG mode), i.e., ICE _ MSID _ EV2SG in table 2, according to 0x 1; the series source mode (SG mode) is switched to the parallel source mode (HD mode) according to 0x4, i.e., ICE _ MSID _ SG2HD in table 2.
Further, referring to fig. 2 and 3, acquiring the mode switching information, and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information, that is, step S3 may further include: if the possibility of simultaneous operation does not exist, judging whether to switch the pure electric mode or the engine participation mode; if the pure electric mode is switched, switching control is carried out on the current power control mode according to the selected first mode switching ID, and then switching control is carried out on the current power control mode according to the selected second mode switching ID; if the engine participation mode is switched first, the current power control mode is switched and controlled according to the selected second mode switching ID, and then the current power control mode is switched and controlled according to the selected second mode switching ID.
For example, when the current electric-only four-wheel drive source mode (E4 mode) is switched to the series source _ electric-only forward drive source mode (SG _ EF mode), if there is a possibility that the electric-only mode switching and the engine participation mode switching are simultaneously performed, the mode switching is simultaneously performed according to 0x7 and 0x 1; if the possibility of simultaneously carrying out pure electric mode switching and engine participation mode switching does not exist, judging whether the pure electric mode is switched firstly or the engine participation mode is switched firstly, if the pure electric mode is switched firstly, switching the current power control mode according to 0x7 firstly, and then carrying out mode switching on the current power control mode according to 0x 1; if the mode switching of the engine participation mode is carried out firstly, the current power control mode is switched according to 0x1, and then the mode switching is carried out according to 0x 7. Therefore, the decision method also has a switching path planning function, and the current power control mode is switched to the target power control mode through different switching paths, so that the definition of the power control mode can be greatly reduced, and the switching complexity is reduced.
In one example of the present invention, referring to fig. 2 and 3, acquiring the mode switching information, and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information, that is, step S3 may further include: judging whether the mode switching is completed; if the mode switching is not finished, judging whether the mode switching time is greater than or equal to a first preset time or not, or whether mode switching failure information is received or not; if the mode switching time is greater than or equal to the first preset time or mode switching failure information is received, ending the mode switching and executing mode resetting operation; after the mode is reset, whether the hybrid electric vehicle has a power control mode switching requirement is detected, and when the hybrid electric vehicle has the power control mode switching requirement, a target power control mode of the hybrid electric vehicle is obtained.
Specifically, referring to fig. 2, 3 and 4, in the process of switching the current power control mode to the target power control mode according to the above embodiment, the progress of mode switching, i.e., the mode switching percentage, may be detected in real time to determine whether the mode switching is completed, if it is determined that the mode switching percentage is between 0 and 100%, it is indicated that the switching is not completed, it is determined whether the mode switching time is greater than or equal to a first preset time to determine whether the mode switching is overtime, or, if a mode switching failure message is received to determine whether the mode switching is failed, if the mode switching is overtime or failed, the mode switching is ended and a mode reset operation is performed to reset the power control mode before the switching, and when the mode switching percentage is 0, it is determined that the mode resetting is completed, after the mode resetting is completed, the method comprises the steps of entering a mode switching intermittent mode, setting intermittent time according to requirements of a whole automobile, detecting whether the hybrid electric vehicle has a power control mode switching requirement or not after exiting the switching intermittent mode, and acquiring a target power control mode of the hybrid electric vehicle when the hybrid electric vehicle has the power control mode switching requirement.
And when the switching is not finished, if the mode switching time is judged to be less than the first preset time and the mode switching failure information is not received, returning to judge whether the mode switching is finished or not so as to perform subsequent control. If the percentage of mode switching is 100%, the mode switching is complete.
It is to be understood that MODE _ SHIFT _ period in fig. 4 represents the MODE switching percentage, EV _ CRRT _ MODE represents the current power control MODE, and EF inhibit represents the disabling of the EF MODE.
As can be seen from the foregoing embodiments and examples, in one example, referring to fig. 2, the step S3 may include the following steps;
s31, judging whether the engine needs to participate when the current power control mode is switched to the target power control mode, if yes, executing step S32; and if not, switching control is carried out on the current power control mode according to the first mode switching ID.
S32, judging whether the pure electric mode needs to be switched when the current power control mode is switched to the target power control mode, if so, executing the step S33; if not, the current power control mode is switched according to the second mode switching ID.
S33, judging whether the possibility of simultaneous execution of pure electric mode switching and engine participation mode switching exists, if so, simultaneously performing switching control on the current power control mode according to the selected first mode switching ID and the selected second mode switching ID; if not, step S34 is performed.
S34, judging whether to switch the pure electric mode, if so, firstly switching and controlling the current power control mode according to the selected first mode switching ID, and then switching and controlling the current power control mode according to the selected second mode switching ID; if not, step S35 is performed.
And S35, switching and controlling the current power control mode according to the selected second mode switching ID, and switching and controlling the current power control mode according to the selected second mode switching ID.
S36, judging whether the mode switching is completed, if not, executing step S37.
And S37, judging whether the mode switching time is larger than or equal to a first preset time or not, or whether mode switching failure information is received or not, if so, ending the mode switching and executing the mode resetting operation, after the mode resetting is completed, detecting whether the hybrid electric vehicle has a power control mode switching requirement, and returning to the step S1 when detecting that the hybrid electric vehicle has the power control mode switching requirement.
In an embodiment of the present invention, the step S1 may further include: judging whether the hybrid electric vehicle has an overspeed protection function on the motor; if the overspeed protection function for the motor exists, acquiring the current speed of the hybrid electric vehicle; determining a selectable power control mode of the hybrid electric vehicle according to the current vehicle speed; judging whether the target power control mode needs to be replaced or not according to the selectable power control mode; if the primary selection mode requires replacement, an alternate target power control mode is selected from the selectable power control modes.
Specifically, if the hybrid vehicle has a device that the motor is disconnected from the transmission system when the vehicle speed is high, or the overspeed protection function of the motor can be enabled through software matching, it is indicated that the hybrid vehicle has the overspeed protection function of the motor, at this time, in order to avoid the motor overspeed after switching the power control mode, the current vehicle speed of the hybrid vehicle is obtained, the selectable power control modes of the hybrid vehicle are determined according to the current vehicle speed, and then the selectable power control mode and the target power control mode can be compared and analyzed to determine whether the target power control mode needs to be replaced by one of the selectable power control modes, that is, whether the target power control mode is one of the selectable power control modes, and if not, the target power control mode is replaced by one of the selectable power control modes, if so, no replacement is necessary. It should be appreciated that the selectable power control modes include a plurality of power control modes that can be achieved while ensuring that the electric machine does not overspeed.
In one example of the present invention, referring to fig. 2 and 3, acquiring the target power control mode of the hybrid vehicle, i.e., the step S1, may further include: determining whether the target power control mode is disabled; if the target power control mode is forbidden, determining an optional power control mode of the hybrid electric vehicle according to the grade of the required torque of the whole vehicle wheel end; an alternate target power control mode is selected from the selectable power control modes.
Specifically, it may be determined whether the target power control mode is disabled or whether there is a disabled mode in the target power control mode, and if so, an optional power control mode of the hybrid vehicle may be determined according to the vehicle wheel end required torque level, and an alternative target power control mode may be selected from the optional power control mode. For example, for a hybrid vehicle with a P24 system structure with a rear axle clutch, if the ER mode is disabled, but the target power control mode is the E4 mode, the EF mode can be used to replace the target power control mode, thereby improving driving safety and reducing driving risk.
As can be seen from the foregoing embodiments and examples, in one example, referring to fig. 2, the foregoing step S1 may include the following steps:
s11, judging whether the hybrid electric vehicle has an overspeed protection function to the motor, if so, executing the step S12; if not, step S14 is performed.
And S12, acquiring the current speed of the hybrid electric vehicle, and determining the selectable power control mode of the hybrid electric vehicle according to the current speed.
S13, judging whether the target power control mode needs to be replaced according to the selectable power control mode, if so, selecting a replaced target power control mode from the selectable power control mode; if not, step S14 is performed.
S14, judging whether the target power control mode is forbidden, if yes, determining an optional power control mode of the hybrid electric vehicle according to the level of the required torque of the whole vehicle wheel end, and selecting a replacement target power control mode from the optional power control mode; if not, step S2 is performed.
It should be noted that the execution sequence of step S11 of determining whether the hybrid vehicle has the overspeed protection function for the motor and step S14 of determining whether the target power control mode is disabled in this example is not limited to this example, and it may be determined whether the hybrid vehicle is disabled first and then determined whether the overspeed protection function for the motor exists, as long as the target power control mode can be replaced when the target power control mode does not meet the relevant requirements.
It should be noted that the mode decision in the embodiment of the present invention is implemented based on a software architecture as shown in fig. 5, and the mode disabling management, the control area management, the entire vehicle mode management, and the power system operation mode management are respectively performed, where the power system operation mode management is implemented by the decision method in the embodiment of the present invention.
In the prior art, the decision and switching of the power control Mode are often complicated, for example, the P134 structure may have an ER Mode and an EF Mode if the front and rear motors are provided with power separation devices, and at least 132 Mode switching IDs are needed if the switching between each Mode is designed by using an independent Mode switching (Mode Shift) ID. However, referring to table 1, the power control mode of this embodiment may cover all the powertrain structures of the parallel hybrid vehicle, so if the power control mode of the embodiment of the present invention is used, the path planning method is used in the complicated switching, and the mode switching is simpler, for example, in the P134 system structure, if the ER mode needs to be switched to the HD _ E4 mode, the switching can be performed simultaneously by analyzing the system structure, so that the switching can be performed simultaneously for the mode switching of the ER mode to the E4 mode (ER2E4) and the mode switching of the ER mode to the HD _ ER mode (ER2HD _ ER), and thus the two mode switching IDs can be issued simultaneously, and the torque distribution of the powertrain is ensured by the torque control during the switching.
The above example, if implemented in a P24 system configuration with rear axle disengaged, the decision link for path planning will yield different results, since the P24 system can implement switching directly from ER to HD _ E4. The software can meet the control requirements of different vehicle power system architectures through flexible configuration.
In summary, the decision method for the power control mode of the hybrid electric vehicle can be applied to hybrid electric vehicles with different power system structures to realize the switching of the power control mode, so that the pre-research period can be greatly shortened, the research and development efforts can be saved, and the research and development costs of multi-structure vehicle types can be reduced; the multiple power control mode switching modes can greatly reduce the definition of the modes, reduce the complexity of function setting of an execution level and improve the software robustness.
Based on the same inventive concept, the embodiment of the present invention provides a decision device for a hybrid vehicle power control mode, where the hybrid vehicle is a parallel hybrid vehicle, and fig. 6 is a structural block diagram of the decision device for the hybrid vehicle power control mode according to the embodiment of the present invention.
As shown in fig. 6, the apparatus 100 includes: the device comprises a first acquisition module 10, a judgment module 20, a second acquisition module 30 and a switching module 40.
The first obtaining module 10 is used for obtaining a target power control mode of the hybrid electric vehicle according to a finished vehicle mode and a finished vehicle wheel end required torque level; the judging module 20 is configured to judge whether the target power control mode is the same as a current power control mode of the hybrid vehicle; the second obtaining module 30 is configured to obtain mode switching information when the target power control mode is different from the current power control mode; the switching module 40 is configured to switch the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information.
Specifically, when it is detected that the hybrid electric vehicle has a power control mode switching requirement, the first obtaining module 10 obtains a target power control mode of the hybrid electric vehicle according to a finished vehicle mode and a finished vehicle wheel end required torque level, and sends the target power control mode to the judging module 20, the judging module 20 judges whether the target power control mode is the same as a current power control mode of the hybrid electric vehicle, and sends a judgment result to the second obtaining module 30, so that the second obtaining module 30 obtains mode switching information when the target power control mode is different from the current power control mode, and sends the mode switching information to the switching module 40, and the switching module 40 switches the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode according to the mode switching information.
It should be noted that, for other specific embodiments of the hybrid vehicle power control mode decision device according to the present invention, reference may be made to the specific embodiment of the hybrid vehicle power control mode decision method according to the foregoing embodiment of the present invention, and in order to avoid redundancy, details are not described here.
The decision-making device for the power control mode of the hybrid electric vehicle can be applied to hybrid electric vehicles with different power system structures to realize the switching of the power control mode, so that the pre-research period can be greatly shortened, the research and development efforts are saved, and the research and development cost of multi-structure vehicle types is reduced.
Fig. 7 is a block diagram of a hybrid vehicle according to an embodiment of the present invention.
As shown in fig. 7, the hybrid vehicle 1000 includes the hybrid vehicle power control mode decision device 100 according to the above embodiment of the present invention.
The hybrid electric vehicle adopts the decision device of the power control mode of the hybrid electric vehicle in the embodiment of the invention, and adopts the decision device of the power control mode of the hybrid electric vehicle in the embodiment of the invention to realize the switching of the power control mode, thereby greatly shortening the pre-research period, saving the research and development efforts and reducing the research and development cost of multi-structure vehicle types.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
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, the various steps or methods may be implemented in software or firmware stored in 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.
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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
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 (10)
1. A decision-making method for a power control mode of a hybrid electric vehicle is characterized in that the hybrid electric vehicle is a parallel hybrid electric vehicle, and the method comprises the following steps:
acquiring a target power control mode of the hybrid electric vehicle according to a finished vehicle mode and a finished vehicle wheel end required torque grade;
judging whether the target power control mode is the same as the current power control mode of the hybrid electric vehicle or not;
and if the target power control mode is different from the current power control mode, acquiring mode switching information, and switching the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode according to the mode switching information.
2. The method for deciding on the power control mode of the hybrid vehicle according to claim 1, wherein acquiring mode switching information and switching the power control mode of the hybrid vehicle from the current power control mode to the target power control mode according to the mode switching information comprises:
judging whether an engine needs to participate when the current power control mode is switched to the target power control mode;
if the participation of the engine is not needed, selecting a corresponding first mode switching ID from a first preset mode switching ID library according to the current power control mode and the target power control mode;
and performing switching control on the current power control mode according to the selected first mode switching ID.
3. The method for deciding on the power control mode of the hybrid vehicle according to claim 2, wherein mode switching information is acquired, and the power control mode of the hybrid vehicle is switched from the current power control mode to the target power control mode according to the mode switching information, further comprising:
if the engine is required to participate, judging whether the pure electric mode needs to be switched when the current power control mode is switched to the target power control mode;
if the pure electric mode needs to be switched, selecting a corresponding first mode switching ID from the first preset mode switching ID library and selecting a corresponding second mode switching ID from the second preset mode switching ID library according to the current power control mode and the target power control mode;
judging whether the possibility of simultaneous execution of the pure electric mode switching and the engine participation mode switching exists;
and if the possibility of simultaneous operation exists, respectively performing switching control on the current power control mode according to the selected first mode switching ID and the selected second mode switching ID.
4. The method for deciding on the power control mode of the hybrid vehicle according to claim 3, wherein mode switching information is acquired, and the power control mode of the hybrid vehicle is switched from the current power control mode to the target power control mode according to the mode switching information, further comprising:
if the possibility of simultaneous operation does not exist, judging whether to switch the pure electric mode or the engine participation mode;
if the pure electric mode is switched, firstly, switching control is carried out on the current power control mode according to the selected first mode switching ID, and then switching control is carried out on the current power control mode according to the selected second mode switching ID;
if the engine participation mode is switched first, the current power control mode is switched and controlled according to the selected second mode switching ID, and then the current power control mode is switched and controlled according to the selected second mode switching ID.
5. The hybrid vehicle power control mode decision method according to any one of claims 2 to 3, wherein mode switching information is acquired, and the power control mode of the hybrid vehicle is switched from the current power control mode to the target power control mode according to the mode switching information, further comprising:
judging whether the mode switching is completed;
if the mode switching is not finished, judging whether the mode switching time is greater than or equal to a first preset time or not, or whether mode switching failure information is received or not;
if the mode switching time is greater than or equal to the first preset time or mode switching failure information is received, ending the mode switching and executing mode resetting operation;
after the mode is reset, whether the hybrid electric vehicle has a power control mode switching requirement is detected, and when the hybrid electric vehicle has the power control mode switching requirement, a target power control mode of the hybrid electric vehicle is obtained.
6. The method for deciding on the power control mode of a hybrid vehicle according to claim 1, wherein the target power control mode of the hybrid vehicle is obtained according to a full vehicle mode and a full vehicle wheel end required torque level, further comprising:
judging whether the hybrid electric vehicle has an overspeed protection function on a motor;
if the overspeed protection function for the motor exists, acquiring the current speed of the hybrid electric vehicle;
determining a selectable power control mode of the hybrid electric vehicle according to the current vehicle speed;
judging whether the target power control mode needs to be replaced or not according to the selectable power control mode;
selecting an alternate target power control mode from the alternate power control modes if the primary selection mode requires an alternate.
7. The hybrid vehicle power control mode decision method according to claim 1 or 6, wherein obtaining the target power control mode of the hybrid vehicle further comprises:
determining whether the target power control mode is disabled;
if the target power control mode is forbidden, determining an optional power control mode of the hybrid electric vehicle according to the level of the required torque of the whole vehicle wheel end;
selecting an alternate one of the target power control modes from the alternate power control modes.
8. The method for determining the power control mode of the hybrid electric vehicle according to claim 1, wherein the power control mode of the hybrid electric vehicle includes a no power source mode, a pure electric rear drive source mode, a pure electric front drive source mode, a pure electric four drive source mode, a series source _ pure electric rear drive source mode, a series source _ pure electric front drive source mode, a series source _ pure electric four drive source mode, a parallel source _ pure electric rear drive source mode, a parallel source _ pure electric front drive source mode, and a parallel source _ pure electric four drive source mode.
9. A hybrid electric vehicle power control mode decision device is characterized in that the hybrid electric vehicle is a parallel hybrid electric vehicle, and the device comprises:
the first acquisition module is used for acquiring a target power control mode of the hybrid electric vehicle according to a finished vehicle mode and a finished vehicle wheel end required torque level;
the judging module is used for judging whether the target power control mode is the same as the current power control mode of the hybrid electric vehicle or not;
the second acquisition module is used for acquiring mode switching information when the target power control mode is different from the current power control mode;
and the switching module is used for switching the power control mode of the hybrid electric vehicle from the current power control mode to the target power control mode according to the mode switching information.
10. A hybrid vehicle characterized by comprising the hybrid vehicle power control mode decision means according to claim 9.
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Application publication date: 20210713 |