CN113734145B

CN113734145B - Vehicle driving method and device and vehicle

Info

Publication number: CN113734145B
Application number: CN202111148379.7A
Authority: CN
Inventors: 蓝天鹏; 陈才; 卜健; 张润生; 吴炯明
Original assignee: Dongfeng Nissan Passenger Vehicle Co
Current assignee: Dongfeng Nissan Passenger Vehicle Co
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2023-01-24
Anticipated expiration: 2041-09-28
Also published as: CN113734145A

Abstract

The invention belongs to the technical field of vehicle control, and discloses a vehicle driving method, a vehicle driving device and a vehicle. The method comprises the following steps: acquiring a required torque; determining a target driving mode according to the required torque, the motor output torque interval and the engine output torque interval; and driving the vehicle according to the target driving mode. Through the mode, the vehicle determines the corresponding target driving mode according to the current required torque, and the most energy-saving driving mode is used for driving the vehicle under different required torques, so that the energy utilization rate of the hybrid vehicle during driving is improved.

Description

Vehicle driving method and device and vehicle

Technical Field

The invention relates to the technical field of vehicle control, in particular to a vehicle driving method and device and a vehicle.

Background

The P2.5 vehicle has two power sources of an engine and a motor, and can not be charged by plugging in electricity, the electric quantity of the battery mainly comes from the power generation of the motor, and the battery simultaneously provides the driving of the motor. However, in general, the P2.5 vehicle starts the charging mode only when the battery power decreases to a certain value, but the fuel consumption during charging may be large, and when the battery power reaches a certain value, the vehicle is continuously driven by the motor and cannot save electric energy well, so that the P2.5 vehicle cannot reduce fuel consumption or save electric energy well during driving.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a vehicle driving method, a vehicle driving device and a vehicle, and aims to solve the technical problem of how to improve the energy utilization rate when a hybrid vehicle runs in the prior art.

To achieve the above object, the present invention provides a vehicle driving method including the steps of:

acquiring a required torque;

determining a target driving mode according to the required torque, the motor output torque interval and the engine output torque interval;

and driving the vehicle according to the target driving mode.

Optionally, the step of determining a target drive mode based on the requested torque, the motor output torque interval, and the engine output torque interval comprises:

determining the maximum output torque and the minimum output torque of the motor according to the output torque interval of the motor, and determining the maximum output torque and the minimum output torque of the engine according to the output torque interval of the engine;

determining a vehicle maximum output torque according to the motor maximum output torque and the engine maximum output torque, and determining a vehicle minimum output torque according to the motor minimum output torque and the engine minimum output torque;

determining a target drive mode according to the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque.

Alternatively, the step of determining a target drive mode based on the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque includes:

when the required torque is greater than the engine maximum output torque and less than the vehicle maximum output torque, taking a power-assisted drive mode as a target drive mode;

when the required torque is greater than the engine minimum output torque and less than the engine maximum output torque, taking a hybrid mode as a target driving mode;

when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque, the charge mode is set as a target drive mode.

Alternatively, the step of setting the assist drive mode as the target drive mode when the required torque is larger than the engine maximum output torque and smaller than the vehicle maximum output torque includes:

when the required torque is larger than the maximum output torque of the engine and smaller than the maximum output torque of the vehicle, distributing the output torque of the motor and the output torque of the engine according to the required torque, the minimum output torque of the motor and the maximum output torque of the engine to obtain an output torque set;

determining a motor driving value of each output torque group in the output torque set;

determining a maximum motor driving value according to the motor driving value;

and when the motor driving value is larger than a driving threshold value, generating a power-assisted driving mode according to an output torque group corresponding to the maximum motor driving value, and taking the power-assisted driving mode as a target driving mode.

Optionally, the step of determining the motor drive value for each output torque set in the output torque set comprises:

determining distributed consumed electric energy according to the output torque of the motor of each output torque group, and determining distributed consumed fuel quantity according to the output torque of the engine of each output torque group;

and determining the motor driving value of each output torque group according to the distributed consumed electric energy, the distributed consumed fuel oil quantity, the reference consumed electric energy and the reference consumed fuel oil quantity.

Alternatively, the step of setting a hybrid mode as the target drive mode when the required torque is greater than the engine minimum output torque and less than the engine maximum output torque includes:

when the required torque is larger than the minimum output torque of the engine and smaller than the maximum output torque of the engine, distributing the output torque of the motor and the output torque of the engine according to the required torque, the minimum output torque of the engine, the maximum output torque of the engine, the minimum output torque of the motor and the maximum output torque of the motor to obtain an output torque set;

determining a motor driving value and a motor power generation value of each output torque group in the output torque set;

determining a maximum motor driving value according to the motor driving value, and determining a minimum motor power generation value according to the motor power generation value;

when the maximum motor driving value is larger than a driving threshold value, generating a mixed mode according to an output torque group corresponding to the maximum motor driving value, and taking the mixed mode as a target driving mode;

and when the minimum motor power generation value is smaller than the power generation threshold value, generating a mixed mode according to the output torque group corresponding to the minimum motor power generation value, and taking the mixed mode as a target driving mode.

Optionally, the step of determining the motor driving value and the motor power generation value of each output torque group in the output torque set includes:

determining distributed consumed electric energy and distributed generated electric energy according to the output torque of the motor of each output torque group, and determining distributed consumed fuel oil amount according to the output torque of the engine of each output torque group;

and determining the motor driving value and the motor power generation value of each output torque group according to the distributed consumed electric energy, the distributed consumed fuel amount and the pure engine driven fuel amount.

Alternatively, the step of regarding the motor drive mode as a target drive mode when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque includes:

when the required torque is larger than the vehicle minimum output torque and smaller than the engine minimum output torque, distributing the motor output torque and the engine output torque according to the required torque, the motor minimum output torque, the motor maximum output torque, the engine minimum output torque and the engine maximum output torque to obtain an output torque set;

determining the motor power generation value of each output torque group in the output torque set;

determining a minimum motor power generation value according to the motor power generation value;

and when the motor power generation value is smaller than the power generation threshold value, generating a charging mode according to the output torque group corresponding to the minimum motor power generation value, and taking the charging mode as a target driving mode.

Optionally, the step of determining the motor power generation value of each output torque group in the output torque set includes:

determining to distribute and generate electric energy according to the output torque of the motor of each output torque group, and determining to distribute and consume fuel oil according to the output torque of the engine of each output torque group;

and determining the motor power generation value of each output torque group according to the distributed generated electric energy, the distributed fuel consumption amount, the reference fuel consumption amount and the reference generated electric energy.

Optionally, after the step of driving the vehicle according to the target driving mode, the method further includes:

acquiring the current electric quantity of a battery;

and when the current electric quantity is within a preset electric quantity interval, taking the motor driving mode as a target driving mode.

Further, to achieve the above object, the present invention also proposes a vehicle drive device including:

the acquisition module is used for acquiring the required torque;

the determining module is used for determining a target driving mode according to the required torque, the motor output torque interval and the engine output torque interval;

and the driving module is used for driving the vehicle according to the target driving mode.

Further, to achieve the above object, the present invention also proposes a vehicle including: a memory, a processor, and a vehicle driver stored on the memory and operable on the processor, the vehicle driver being configured to implement the steps of the vehicle driving method as described above.

Furthermore, to achieve the above object, the present invention also proposes a storage medium having a vehicle driver stored thereon, which when executed by a processor implements the steps of the vehicle driving method as described above.

The method comprises the steps of acquiring a required torque; determining a target driving mode according to the required torque, the motor output torque interval and the engine output torque interval; and driving the vehicle according to the target driving mode. Through the mode, the vehicle determines the corresponding target driving mode according to the current required torque, and the most energy-saving driving mode is used for driving the vehicle under different required torques, so that the energy utilization rate of the hybrid vehicle during driving is improved.

Drawings

FIG. 1 is a schematic diagram of a vehicle in a hardware operating environment according to an embodiment of the present invention;

fig. 2 is a schematic flowchart of a first embodiment of a vehicle driving method of the invention;

fig. 3 is a schematic flowchart of a second embodiment of the vehicle driving method of the invention;

FIG. 4 is a schematic diagram of driving thresholds and generating thresholds according to an embodiment of the driving method of the vehicle of the present invention;

fig. 5 is a block diagram showing the construction of a first embodiment of the vehicular drive apparatus of the invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a schematic vehicle structure diagram of a hardware operating environment according to an embodiment of the present invention.

As shown in fig. 1, the vehicle may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.

Those skilled in the art will appreciate that the configuration shown in FIG. 1 is not intended to be limiting and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.

As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and a vehicle driver.

In the vehicle shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the vehicle of the present invention may be provided in the vehicle, and the vehicle calls the vehicle driving program stored in the memory 1005 through the processor 1001 and executes the vehicle driving method provided by the embodiment of the present invention.

An embodiment of the present invention provides a vehicle driving method, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the vehicle driving method according to the present invention.

In this embodiment, the vehicle driving method includes the steps of:

step S10: and acquiring the required torque.

It should be noted that the execution subject of the embodiment may be an in-vehicle terminal, and the in-vehicle terminal may perform data processing based on a sensor of the vehicle or vehicle condition data, so as to implement various functions on the vehicle.

In specific implementation, the required torque is torque required by the vehicle to reach a target speed from a current speed, when a driver needs to accelerate, an accelerator pedal is pressed, an accelerator pedal opening can be obtained at the moment, the target speed of the vehicle is determined according to the pedal opening and the current gear of the vehicle, and the target speeds of the accelerator pedal opening under different gears are different. The torque required to achieve the target speed is the required torque, and therefore, the required torque can be determined by the pedal opening and the current gear.

Step S20: and determining a target driving mode according to the required torque, the motor output torque interval and the engine output torque interval.

It should be noted that the vehicle in this embodiment is a vehicle with a P2.5 structure, and the P2.5 structure is implemented by integrating a motor inside a transmission, coupling the motor with an even shaft of a dual clutch transmission through a gear, controlling an even gear by the motor, controlling an odd gear and an even gear by an engine, and sharing a clutch module, so as to finally implement that two power systems drive the vehicle individually or jointly to implement maximum torque output.

In a specific implementation, the motor output torque interval refers to a torque range that can be output by a vehicle motor, and includes a maximum torque and a minimum torque that can be output by the motor, for example: the motor output torque interval of a certain vehicle is-100 Nm to 100Nm, when the motor output torque is-100 Nm to 0Nm, the motor generates power, and when the motor output torque is 0Nm to 100Nm, the motor drives. The above are merely examples, and the present embodiment is not limited thereto. Similarly, the engine output torque range refers to a torque range that can be output by the vehicle engine.

It should be understood that one of the conditions affecting the torque output of the motor is the charge of the vehicle-mounted battery, the torque recommended to be output by the motor is different under different battery charge conditions, and different battery charge intervals correspond to different recommended output torques, for example: the recommended output torque of the motor is 20Nm when the battery level is 10% to 30%, 40Nm when the battery level is 30% to 50%, and 60Nm when the battery level is 50% to 70%. The above are merely examples, and the present embodiment is not limited thereto.

Further, after the current battery capacity belonging interval is determined, the corresponding suggested output torque is determined according to the belonging interval, the torque required to be output by the engine is determined according to the required torque, and the target driving mode is generated according to the motor output torque and the engine output torque.

It can be understood that when the battery power is lower than the power threshold, the motor does not output kinetic energy, power generation is needed, and the engine needs to completely meet the required torque. When the engine can not completely meet the required torque, the driver is prompted that the current battery power is insufficient, and the engine outputs the maximum torque at the moment.

Step S30: and driving the vehicle according to the target driving mode.

It is understood that the torque distribution in the target drive mode varies according to the required torque because the torque output from the motor and the engine differs for different required torques.

Further, because of the characteristic of the battery, when the battery power is in a certain interval, the battery resistance is small, and at this moment, the electric energy can be saved comparatively through the motor drive, and then after step S30, the method further includes: acquiring the current electric quantity of a battery; and when the current electric quantity is within a preset electric quantity interval, taking the motor driving mode as a target driving mode.

In a specific implementation, the motor driving mode is a motor output positive torque to drive the vehicle, and if the target driving mode is a motor charging mode, when the battery capacity reaches a preset capacity interval, the battery charging mode is stopped, and the motor driving mode is the target driving mode.

The embodiment obtains the required torque; determining a target driving mode according to the required torque, the motor output torque interval and the engine output torque interval; and driving the vehicle according to the target driving mode. Through the mode, the vehicle determines the corresponding target driving mode according to the current required torque, and the most energy-saving driving mode is used for driving the vehicle under different required torques, so that the energy utilization rate of the hybrid vehicle during driving is improved.

Referring to fig. 3, fig. 3 is a flowchart illustrating a second embodiment of a vehicle driving method according to the present invention.

Based on the first embodiment described above, the vehicle driving method of the embodiment includes, at step S20:

step S21: and determining the maximum output torque and the minimum output torque of the motor according to the output torque interval of the motor, and determining the maximum output torque and the minimum output torque of the engine according to the output torque interval of the engine.

It should be noted that the motor output torque interval includes a maximum output torque and a minimum output torque that can be output by the motor, the minimum output torque is a negative torque, when the motor outputs a negative torque, the motor outputs electric energy to charge the battery, and when the motor outputs a positive torque, the motor outputs kinetic energy to drive the vehicle. Similarly, the engine output torque interval includes the maximum output torque and the minimum output torque that the engine can output.

It can be understood that, in vehicles of different models, the motor and the engine may not be in accordance, and therefore, the motor output torque interval and the engine output torque interval may not be in accordance.

Step S22: and determining the maximum output torque of the vehicle according to the maximum output torque of the motor and the maximum output torque of the engine, and determining the minimum output torque of the vehicle according to the minimum output torque of the motor and the minimum output torque of the engine.

In specific implementation, the maximum output torque of the motor is added with the maximum output torque of the engine to obtain the maximum output torque of the vehicle, and the minimum output torque of the motor is added with the minimum output torque of the engine to obtain the minimum output torque of the vehicle. For example: the maximum output torque of the motor is 100Nm, the maximum output torque of the engine is 200Nm, the maximum output torque of the vehicle is 300Nm, the minimum output torque of the motor is-100 Nm, the minimum output torque of the engine is 0Nm, and the minimum output torque of the vehicle is-100 Nm. The above are merely examples, and the present embodiment is not limited thereto.

Step S23: determining a target drive mode according to the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque.

Further, in order to more accurately distribute the torque output from the motor and the engine according to the required torque, step S23 includes: when the required torque is greater than the engine maximum output torque and less than the vehicle maximum output torque, taking a power-assisted drive mode as a target drive mode; when the required torque is greater than the engine minimum output torque and less than the engine maximum output torque, taking a hybrid mode as a target driving mode; when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque, the charge mode is set as a target drive mode.

When the required torque is greater than the maximum output torque of the engine and less than the maximum output torque of the vehicle, it means that the required torque cannot be satisfied by the torque that can be output by the engine alone, and the torque output by the motor is required at this time. And generating a target driving mode according to the torque required to be output by the motor and the torque output by the engine, wherein the target driving mode comprises the torque required to be output by the motor and the torque required to be output by the engine, so that the required torque is completely met.

Further, in order to save electric energy and fuel consumption when the motor outputs torque, it is necessary to select the most reasonable motor output torque and engine output torque, and the step of taking the power-assisted driving mode as the target driving mode when the required torque is greater than the maximum engine output torque and less than the maximum vehicle output torque includes: when the required torque is larger than the maximum output torque of the engine and smaller than the maximum output torque of the vehicle, distributing the output torque of the motor and the output torque of the engine according to the required torque, the minimum output torque of the motor and the maximum output torque of the engine to obtain an output torque set; determining a motor driving value of each output torque group in the output torque set; determining a maximum motor driving value according to the motor driving value; and when the motor driving value is larger than a driving threshold value, generating a power-assisted driving mode according to an output torque group corresponding to the maximum motor driving value, and taking the power-assisted driving mode as a target driving mode.

It is noted that, firstly, the interval of the allowable output torque of the motor needs to be determined, the minimum output torque of the engine is subtracted from the required torque, the obtained result is compared with the maximum output torque of the motor, and the smaller one is selected as the allowable maximum output torque of the motor; and subtracting the maximum output torque of the engine from the required torque, comparing the obtained result with the minimum output torque of the motor, and selecting the larger one as the minimum output torque allowed by the motor, thereby obtaining the torque output allowed interval of the motor.

In a specific implementation, when the motor output torque is distributed according to the required torque, the motor output torque needs to be within an allowable output torque interval of the motor, and the required torque is subtracted by the distributed motor output torque to obtain a corresponding engine output torque, so as to obtain a set of output torque groups, and when the motor output torque is distributed, multiple sets of output torque groups are distributed, for example: the required torque is 200Nm, the maximum output torque of the motor is 100Nm, the maximum output torque of the engine is 190Nm, the allocated motor output torques are 10Nm, 20Nm, 30Nm, 40Nm, 50Nm, 60Nm, 70Nm, 80Nm, 90Nm and 100Nm, and the corresponding engine output torques are 190Nm, 180Nm, 170Nm, 160Nm, 150Nm, 140Nm, 130Nm, 120Nm, 110Nm and 100Nm, thereby obtaining 10 groups of output torques. The interval of the distributed torque may be 10Nm, 5Nm, etc., and the embodiment is not limited.

Further, the motor driving value is an index for measuring whether the motor is driven to save energy, and in order to determine the most energy-saving output torque group, the step of determining the motor driving value of each output torque group in the output torque set comprises: determining distributed consumed electric energy according to the output torque of the motor of each output torque group, and determining distributed consumed fuel quantity according to the output torque of the engine of each output torque group; and determining the motor driving value of each output torque group according to the distributed consumed electric energy, the distributed consumed fuel oil quantity, the reference consumed electric energy and the reference consumed fuel oil quantity.

It will be appreciated that the apportioned output torque of the electric machines in the output torque set corresponds to the apportioned consumed electrical energy, i.e. the electrical energy that needs to be consumed when the electric machines are driven at that torque, and the apportioned output torque of the engines in the same output torque set corresponds to the apportioned consumed fuel amount, i.e. the fuel amount that needs to be consumed when the engines are driven at that torque, the correspondence being obtained when testing the vehicle at a previous stage.

When the required torque is greater than the engine maximum output torque and less than the vehicle maximum output torque, the reference output torque group is the engine output maximum torque, and the electric machine supplements and outputs the remaining required torque combination, for example: when the required torque is 100Nm, assuming that the maximum output torque of the engine is 60Nm, the reference torque group is the engine output torque 60Nm and the motor output torque 40Nm. The above are merely examples, and the present embodiment is not limited thereto.

Therefore, the reference consumed electric energy is the electric energy required to be consumed corresponding to the output torque of the motor in the reference output torque group, and the reference consumed fuel amount is the fuel amount required to be consumed corresponding to the output torque of the engine in the reference output torque group. The motor driving value calculation formula is as follows:

wherein A is a motor driving value, x is a fuel saving amount, y is an increased power consumption amount, m is a reference fuel consumption amount, n is a distributed fuel consumption amount, k is distributed power consumption, and i is a reference power consumption amount. As can be seen from the above equation 1, the fuel saving amount is obtained by subtracting the distributed fuel consumption amount from the reference fuel consumption amount, and the power consumption is increased by subtracting the reference power consumption from the distributed power consumption amount.

In a specific implementation, after the motor driving values of each output torque group are calculated, the maximum motor driving value is determined, and the maximum motor driving value is compared with a driving threshold, which is determined according to the current electric quantity of the automobile battery, as shown in fig. 4, SOC (State of Charge) is the State of Charge of the battery, and the driving thresholds are different for different battery electric quantities. And if the maximum motor driving value is larger than the driving threshold value, taking the motor output torque and the engine output torque in the output torque group corresponding to the maximum motor driving value as torque distribution indexes in the power-assisted driving mode, so that the motor outputs the torque according to the motor output torque, and the engine outputs the torque according to the engine output torque.

Further, when the required torque is greater than the minimum output torque of the engine and less than the maximum output torque of the engine, the torque output by the engine can completely meet the required torque, the motor can output kinetic energy to drive the vehicle and can also output electric energy to charge the battery, and when the required torque is greater than the minimum output torque of the engine and less than the maximum output torque of the engine, the step of taking the mixed mode as the target driving mode comprises the following steps: when the required torque is larger than the minimum output torque of the engine and smaller than the maximum output torque of the engine, distributing the output torque of the motor and the output torque of the engine according to the required torque, the minimum output torque of the engine, the maximum output torque of the engine, the minimum output torque of the motor and the maximum output torque of the motor to obtain an output torque set; determining a motor driving value and a motor power generation value of each output torque group in the output torque set; determining a maximum motor driving value according to the motor driving value, and determining a minimum motor power generation value according to the motor power generation value; when the maximum motor driving value is larger than a driving threshold value, generating a mixed mode according to an output torque group corresponding to the maximum motor driving value, and taking the mixed mode as a target driving mode; and when the minimum motor power generation value is smaller than the power generation threshold value, generating a mixed mode according to the output torque group corresponding to the minimum motor power generation value, and taking the mixed mode as a target driving mode.

Meanwhile, when the required torque is equal to the engine minimum output torque or equal to the engine maximum output torque, the hybrid mode is taken as the target drive mode.

Similarly, it is necessary to determine the motor output allowable torque range, but since a negative torque is output when the motor generates power, the motor output allowable torque range needs to be divided into a positive torque range and a negative torque range. When a positive torque interval is determined, subtracting the minimum output torque of the engine from the required torque, comparing the obtained result with the maximum output torque of the motor, wherein the smaller of the two is the maximum value of the positive torque interval, and the minimum value of the positive torque interval is 0Nm. When a negative torque interval is determined, the required torque is subtracted by the maximum torque of the engine, and the obtained result is compared with the minimum torque of the motor, wherein the larger one of the two is the minimum value of the negative torque interval, and 0Nm is the maximum value of the negative torque interval.

In a specific implementation, an output torque set of the motor output torque and the engine output torque is distributed according to the required torque and the positive torque interval, and similarly, the output torque set of the motor output torque and the engine output torque is distributed according to the required torque and the negative torque interval.

Further, if it is necessary to calculate the motor driving value of each group according to the output torque set allocated in the positive torque interval, and calculate the power generation value of each output torque group in the output torque set allocated in the negative torque interval, the step of determining the motor driving value and the motor power generation value of each output torque group in the output torque set includes: determining distributed consumed electric energy and distributed generated electric energy according to the output torque of the motor of each output torque group, and determining distributed consumed fuel oil amount according to the output torque of the engine of each output torque group; and determining the motor driving value and the motor power generation value of each output torque group according to the distributed consumed electric energy, the distributed consumed fuel amount and the pure engine driven fuel amount.

In a specific implementation, the pure engine-driven fuel amount refers to the fuel amount consumed when only the engine is used to meet the required torque, and the distributed generated electric energy refers to the electric energy generated when the motor operates by outputting negative torque by the motor in the torque output group.

Wherein, B is the power generation value of the motor, z is the pure engine driving fuel quantity, and e is the distribution generated electric energy.

Calculating to obtain motor driving values of each group in the output torque set distributed in the positive torque interval, calculating to obtain motor power generation values of each group in the output torque set distributed in the negative torque interval, selecting the maximum motor driving value in the motor driving values of each group, selecting the minimum motor power generation value in the motor power generation values of each group, driving the motor when the maximum motor driving value is greater than the driving threshold, and generating the power when the minimum motor power generation value is less than the power generation threshold, wherein the power generation threshold is determined according to the electric quantity of the battery, and the power generation threshold is different under different electric quantities of the battery as shown in FIG. 4.

In specific implementation, when the motor is determined to need to be driven, the hybrid mode is generated according to the output torque group corresponding to the maximum motor driving value, and similarly, when the motor is determined to need to generate power, the hybrid mode is generated according to the output torque group corresponding to the minimum motor power generation value. When the maximum motor driving value is smaller than the driving threshold value and the minimum motor power generation value is larger than the power generation threshold value, the motor does not drive or generate power, and the required torque is completely met by the engine.

Further, the step of regarding the motor drive mode as a target drive mode when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque includes: when the required torque is larger than the vehicle minimum output torque and smaller than the engine minimum output torque, distributing the motor output torque and the engine output torque according to the required torque, the motor minimum output torque, the motor maximum output torque, the engine minimum output torque and the engine maximum output torque to obtain an output torque set; determining the motor power generation value of each output torque group in the output torque set; determining a minimum motor power generation value according to the motor power generation value; and when the motor power generation value is smaller than a power generation threshold value, generating a charging mode according to an output torque group corresponding to the minimum motor power generation value, and taking the charging mode as a target driving mode.

Meanwhile, when the required torque is equal to the vehicle minimum output torque, the charging mode is taken as the target drive mode.

Similarly, when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque, subtracting the engine maximum output torque from the required torque, comparing the obtained result with the motor minimum output torque, and taking the larger of the two as the maximum value of the motor allowable output torque; and subtracting the minimum output torque of the engine from the required torque, comparing the obtained result with the maximum output torque of the motor, and taking the smaller of the two as the minimum value of the allowable output torque of the motor, thereby obtaining the allowable output torque interval of the motor, wherein the allowable output torque interval of the motor is a negative torque interval.

And thirdly, distributing the output torque of the motor and the output torque of the engine according to the allowable output torque interval and the required torque of the motor to obtain an output torque set, and calculating the motor power generation value of each output torque group in the output torque set.

It is understood that, when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque, the reference torque group is the engine output minimum torque, and the motor supplements the remaining required torque, at which time the torque output by the motor is a negative value.

Further, the step of determining the motor power generation value of each output torque group in the output torque set comprises: determining to distribute generated electric energy according to the output torque of the motor of each output torque group, and determining to distribute fuel consumption according to the output torque of the engine of each output torque group; and determining the motor power generation value of each output torque group according to the distributed generated electric energy, the distributed fuel consumption amount, the reference fuel consumption amount and the reference generated electric energy.

The calculation formula of the power generation value of the motor is as follows:

wherein d is the increased fuel quantity, f is the generated electric energy, and g is the reference generated electric energy. As can be seen from the above equation 3, the fuel consumption is distributed minus the reference fuel consumption to obtain the increased fuel amount, and the power consumption is distributed minus the reference generated power to obtain the generated power.

When the required torque is greater than the vehicle minimum output torque and less than the motor minimum output torque, a reference output torque set is generated according to a preset proportion and the required torque, and the reference generated electric energy is electric energy generated when the motor operates with the reference output torque set.

Similarly, a minimum motor power value is determined according to the motor power values of the output torque groups, and the minimum motor power value is compared with a power generation threshold, as shown in fig. 4, where the power generation threshold corresponds to the current electric quantity of the battery. And when the minimum motor power generation value is smaller than the power generation threshold value, generating a charging mode by using the output torque group corresponding to the minimum power generation value, and taking the charging mode as a target driving mode. And when the minimum motor power generation value is larger than the power generation threshold value, outputting the torque according to the reference output torque group.

The embodiment determines the maximum output torque of the motor and the minimum output torque of the motor according to the output torque interval of the motor, and determines the maximum output torque of the engine and the minimum output torque of the engine according to the output torque interval of the engine; determining a vehicle maximum output torque according to the motor maximum output torque and the engine maximum output torque, and determining a vehicle minimum output torque according to the motor minimum output torque and the engine minimum output torque; determining a target drive mode according to the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque. Through the mode, the output torque of the motor and the output torque of the engine are distributed according to the torque which can be output by the motor and the engine and the required torque, so that the energy consumption of a vehicle can be better.

Furthermore, an embodiment of the present invention also provides a storage medium, on which a vehicle driver is stored, and the vehicle driver implements the steps of the vehicle driving method as described above when executed by a processor.

Since the storage medium adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated herein.

Referring to fig. 5, fig. 5 is a block diagram showing the configuration of the first embodiment of the vehicular drive apparatus of the invention.

As shown in fig. 5, a vehicle drive device according to an embodiment of the present invention includes:

an obtaining module 10 obtains a requested torque.

The determination module 20 determines a target drive mode based on the requested torque, the motor output torque interval, and the engine output torque interval.

And a driving module 30 for driving the vehicle according to the target driving mode.

It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.

In one embodiment, the determining module 20 is further configured to determine a motor maximum output torque and a motor minimum output torque according to the motor output torque interval, and determine an engine maximum output torque and an engine minimum output torque according to the engine output torque interval; determining a vehicle maximum output torque according to the motor maximum output torque and the engine maximum output torque, and determining a vehicle minimum output torque according to the motor minimum output torque and the engine minimum output torque; determining a target drive mode according to the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque.

In one embodiment, the determining module 20, further configured to determine the target driving mode based on the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque, comprises: when the required torque is greater than the engine maximum output torque and less than the vehicle maximum output torque, taking a power-assisted drive mode as a target drive mode; when the required torque is greater than the engine minimum output torque and less than the engine maximum output torque, taking a hybrid mode as a target driving mode; when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque, the charging mode is set as a target drive mode.

In one embodiment, the determining module 20, further configured to take the assist drive mode as the target drive mode when the required torque is greater than the engine maximum output torque and less than the vehicle maximum output torque, includes: when the required torque is larger than the maximum output torque of the engine and smaller than the maximum output torque of the vehicle, distributing the output torque of the motor and the output torque of the engine according to the required torque, the minimum output torque of the motor and the maximum output torque of the engine to obtain an output torque set; determining a motor driving value of each output torque group in the output torque set; determining a maximum motor driving value according to the motor driving value; and when the motor driving value is larger than a driving threshold value, generating a power-assisted driving mode according to an output torque group corresponding to the maximum motor driving value, and taking the power-assisted driving mode as a target driving mode.

In one embodiment, the determining module 20 is further configured to determine the distributed consumed electric energy according to the output torque of the motor of each output torque group, and determine the distributed consumed fuel amount according to the output torque of the engine of each output torque group; and determining the motor driving value of each output torque group according to the distributed consumed electric energy, the distributed consumed fuel amount, the reference consumed electric energy and the reference consumed fuel amount.

In one embodiment, the determining module 20, further configured to take the hybrid mode as the target driving mode when the required torque is greater than the engine minimum output torque and less than the engine maximum output torque, includes: when the required torque is larger than the minimum output torque of the engine and smaller than the maximum output torque of the engine, distributing the output torque of the motor and the output torque of the engine according to the required torque, the minimum output torque of the engine, the maximum output torque of the engine, the minimum output torque of the motor and the maximum output torque of the motor to obtain an output torque set; determining a motor driving value and a motor power generation value of each output torque group in the output torque set; determining a maximum motor driving value according to the motor driving value, and determining a minimum motor power generation value according to the motor power generation value; when the maximum motor driving value is larger than a driving threshold value, generating a mixed mode according to an output torque group corresponding to the maximum motor driving value, and taking the mixed mode as a target driving mode; and when the minimum motor power generation value is smaller than the power generation threshold value, generating a mixed mode according to the output torque group corresponding to the minimum motor power generation value, and taking the mixed mode as a target driving mode.

In one embodiment, the determining module 20 is further configured to determine the distributed consumed electric energy and the distributed generated electric energy according to the output torque of the motor of each output torque group, and determine the distributed consumed fuel amount according to the output torque of the engine of each output torque group; and determining the motor driving value and the motor power generation value of each output torque group according to the distributed consumed electric energy, the distributed consumed fuel amount and the pure engine driven fuel amount.

In one embodiment, the determining module 20 is further configured to, when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque, allocate a motor output torque and an engine output torque according to the required torque, the motor minimum output torque, the motor maximum output torque, the engine minimum output torque, and the engine maximum output torque to obtain an output torque set; determining the motor power generation value of each output torque group in the output torque set; determining a minimum motor power generation value according to the motor power generation value; and when the motor power generation value is smaller than the power generation threshold value, generating a charging mode according to the output torque group corresponding to the minimum motor power generation value, and taking the charging mode as a target driving mode.

In one embodiment, the determining module 20 is further configured to determine to allocate electric energy according to the output torque of the motor of each output torque group, and determine to allocate fuel consumption according to the output torque of the engine of each output torque group; and determining the motor power generation value of each output torque group according to the distributed generated electric energy, the distributed fuel consumption amount, the reference fuel consumption amount and the reference generated electric energy.

In an embodiment, the driving module 30 is further configured to obtain a current electric quantity of the battery; and when the current electric quantity is within a preset electric quantity interval, taking the motor driving mode as a target driving mode.

It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.

In addition, the technical details that are not described in detail in this embodiment can be referred to a vehicle driving method provided by any embodiment of the present invention, and are not described herein again.

Furthermore, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A vehicle driving method characterized by comprising:

acquiring a required torque;

driving the vehicle according to the target driving mode;

the step of determining a target drive mode according to the required torque, the motor output torque interval, and the engine output torque interval includes:

2. The method according to claim 1, wherein the step of determining a target drive mode based on the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque comprises:

when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque, a charging mode is taken as a target driving mode.

3. The method according to claim 2, wherein the step of regarding a power-assisted drive mode as the target drive mode when the required torque is greater than the engine maximum output torque and less than the vehicle maximum output torque includes:

determining a maximum motor driving value according to the motor driving value;

4. The method of claim 3, wherein said step of determining motor drive values for each output torque group in said set of output torques comprises:

determining distribution consumed electric energy according to the output torque of the motor of each output torque group, and determining distribution consumed fuel amount according to the output torque of the engine of each output torque group;

5. The method according to claim 2, wherein the step of taking a hybrid mode as a target drive mode when the required torque is greater than the engine minimum output torque and less than the engine maximum output torque comprises:

6. The method of claim 5, wherein said step of determining motor drive values and motor generator values for each output torque group in said set of output torques comprises:

7. The method according to claim 2, wherein the step of regarding a charge mode as a target drive mode when the required torque is greater than the vehicle minimum output torque and less than the engine minimum output torque includes:

8. The method of claim 7, wherein said step of determining a motor generator value for each output torque group in said set of output torques comprises:

determining to distribute generated electric energy according to the output torque of the motor of each output torque group, and determining to distribute fuel consumption according to the output torque of the engine of each output torque group;

9. The method according to any one of claims 1 to 8, further comprising, after the step of driving the vehicle according to the target drive mode:

acquiring the current electric quantity of a battery;

and when the current electric quantity is within a preset electric quantity interval, taking a motor driving mode as a target driving mode.

10. A vehicle drive apparatus, characterized by comprising:

the acquisition module is used for acquiring the required torque;

the driving module is used for driving the vehicle according to the target driving mode;

the determining module is further used for determining the maximum output torque of the motor and the minimum output torque of the motor according to the output torque interval of the motor, and determining the maximum output torque of the engine and the minimum output torque of the engine according to the output torque interval of the engine; determining a vehicle maximum output torque according to the motor maximum output torque and the engine maximum output torque, and determining a vehicle minimum output torque according to the motor minimum output torque and the engine minimum output torque; determining a target drive mode according to the required torque, the engine maximum output torque, the engine minimum output torque, the vehicle maximum output torque, and the vehicle minimum output torque.

11. A vehicle, characterized in that the vehicle comprises: a memory, a processor, and a vehicle driver stored on the memory and operable on the processor, the vehicle driver being configured to implement the vehicle driving method of any one of claims 1 to 9.