阅读说明：本技术 基于双驱动器系统的新能源汽车飞轮系统及其控制方法 (New energy automobile flywheel system based on dual-driver system and control method thereof ) 是由 王波 李�浩 于 2021-01-13 设计创作，主要内容包括：本发明实施例公开了一种基于双驱动器系统的新能源汽车飞轮系统及其控制方法,所述飞轮系统包括能量源、双驱动器、驱动系统、飞轮装置,所述飞轮系统还包括：首次起机模块：双驱动器驱动飞轮装置以恒功率运行状态运作起来固定转速状态下；缓慢加速或巡航模块：将能量源的电能经驱动系统转换为机械能驱动整车；急加速或飞轮满额模块：以驱动系统需求的功率来制动飞轮装置；缓慢减速模块：将整车的机械能经驱动系统转换为电能存储到能量源；急减速或飞轮欠额模块：双驱动器先以驱动系统制动功率驱动飞轮装置。本发明采用飞轮装置,使飞轮装置在系统中吸收/释放瞬时大功率,对功率流进行滤波平滑,降低能量源端的高功率密度需求。(The embodiment of the invention discloses a new energy automobile flywheel system based on a dual-driver system and a control method thereof, wherein the flywheel system comprises an energy source, the dual drivers, a driving system and a flywheel device, and the flywheel system also comprises: the first startup module: the dual-driver drives the flywheel device to operate in a constant-power operation state and fix the rotating speed; slow acceleration or cruise module: converting the electric energy of the energy source into mechanical energy through a driving system to drive the whole vehicle; fast acceleration or flywheel full module: braking the flywheel device with the power required by the drive system; the slow speed reduction module: converting mechanical energy of the whole vehicle into electric energy through a driving system and storing the electric energy to an energy source; sudden deceleration or flywheel underrun module: the dual-driver drives the flywheel device by the braking power of the driving system. The invention adopts the flywheel device, so that the flywheel device absorbs/releases instantaneous high power in the system, filters the power flow smoothly and reduces the high power density requirement of the energy source end.)

1. The utility model provides a new energy automobile flywheel system based on dual driver system, the flywheel system includes energy source, dual driver, actuating system, its characterized in that, the flywheel system still includes the flywheel device of being connected with the dual driver electricity, and the flywheel device comprises flywheel body and motor, the flywheel system includes:

the first startup module: when the automobile is started for the first time or is started after long-time parking, the dual-driver drives the flywheel device to operate in a constant-power running state and the rotating speed is fixed;

slow acceleration or cruise module: when the automobile is slowly accelerated or the automobile is cruising at a fixed speed, the dual-driver converts the electric energy of the energy source into mechanical energy through the driving system to drive the whole automobile, and in the process, the flywheel device is in a running standby state at all times;

fast acceleration or flywheel full module: when the automobile requires a rapid acceleration mode, the dual-driver brakes the flywheel device with the power required by the driving system to match the power requirement of the driving system, and if the power of the driving system is greater than the instantaneous power of the flywheel device at the moment, the energy source provides supplement; when the automobile is in a normal driving mode, if the flywheel device is in a full-rated state due to braking feedback, the dual-driver firstly controls the flywheel device to provide energy for a driving system, and the balance is reduced to the standby operation requirement;

the slow speed reduction module: when the automobile is slowly decelerated, the dual-driver converts the mechanical energy of the whole automobile into electric energy through the driving system and stores the electric energy into an energy source, and the flywheel device is continuously in a running standby state in the process;

sudden deceleration or flywheel underrun module: when the automobile needs a rapid deceleration mode, a driving system instantaneously brakes high-power energy, a dual driver drives a flywheel device with the braking power of the driving system to match the braking power of the driving system, and if the braking power of the driving system is larger than the absorption power of the flywheel device at the moment, the energy is absorbed by an energy source; when the automobile is in a normal feedback mode, if the flywheel device is in an underrated state due to driving, the dual-driver firstly meets the requirement that the driving system supplies energy to the flywheel system and increases the underrated flywheel device to the standby operation.

2. The dual-driver system based new energy vehicle flywheel system according to claim 1, wherein the flywheel system further comprises:

the slope module: when the energy source fails or the front-end power distribution function fails, and the dual-driver cannot receive energy, the dual-driver firstly controls the flywheel device to provide energy for the driving system, so that the slope running function under the energy source failure mode is realized, and the safety is ensured.

3. The dual-driver system based new energy vehicle flywheel system according to claim 1, wherein the flywheel system further comprises:

a charging module: trickle charging and CC charging are carried out firstly in a charging mode, after the CC charging is finished, a dual driver is switched into a constant power charging mode of the flywheel device, and when the flywheel device is full, the charging is stopped; energy stored in the flywheel device is fed back to the energy source through the dual driver in a constant voltage feeding mode, and if the driving is required in the process, the dual driver firstly converts the energy to the driving system for driving.

4. A control method of a new energy automobile flywheel system based on a dual-driver system is characterized by comprising the following steps:

a first starting step: when the automobile is started for the first time or is started after long-time parking, the dual-driver drives the flywheel device to operate in a constant-power running state and the rotating speed is fixed;

slow acceleration or cruise step: when the automobile is slowly accelerated or the automobile is cruising at a fixed speed, the dual-driver converts the electric energy of the energy source into mechanical energy through the driving system to drive the whole automobile, and in the process, the flywheel device is in a running standby state at all times;

quick acceleration or flywheel full-charge step: when the automobile requires a rapid acceleration mode, the dual-driver brakes the flywheel device with the power required by the driving system to match the power requirement of the driving system, and if the power of the driving system is greater than the instantaneous power of the flywheel device at the moment, the energy source provides supplement; when the automobile is in a normal driving mode, if the flywheel device is in a full-rated state due to braking feedback, the dual-driver firstly controls the flywheel device to provide energy for a driving system, and the balance is reduced to the standby operation requirement;

and a slow deceleration step: when the automobile is slowly decelerated, the dual-driver converts the mechanical energy of the whole automobile into electric energy through the driving system and stores the electric energy into an energy source, and the flywheel device is continuously in a running standby state in the process;

and (3) a step of sudden deceleration or flywheel underrun: when the automobile needs a rapid deceleration mode, a driving system instantaneously brakes high-power energy, a dual driver drives a flywheel device with the braking power of the driving system to match the braking power of the driving system, and if the braking power of the driving system is larger than the absorption power of the flywheel device at the moment, the energy is absorbed by an energy source; when the automobile is in a normal feedback mode, if the flywheel device is in an underrated state due to driving, the dual-driver firstly meets the requirement that the driving system supplies energy to the flywheel system and increases the underrated flywheel device to the standby operation.

5. The method for controlling the flywheel system of the new energy vehicle based on the dual-driver system according to claim 4, wherein the first startup step further comprises:

a slope traveling step: when the energy source fails or the front-end power distribution function fails, and the dual-driver cannot receive energy, the dual-driver firstly controls the flywheel device to provide energy for the driving system, so that the slope running function under the energy source failure mode is realized, and the safety is ensured.

6. The method for controlling the flywheel system of the new energy vehicle based on the dual-driver system according to claim 4, wherein the first startup step further comprises:

a charging step: trickle charging and CC charging are carried out firstly in a charging mode, after the CC charging is finished, a dual driver is switched into a constant power charging mode of the flywheel device, and when the flywheel device is full, the charging is stopped; energy stored in the flywheel device is fed back to the energy source through the dual driver in a constant voltage feeding mode, and if the driving is required in the process, the dual driver firstly converts the energy to the driving system for driving.

Technical Field

The invention relates to the technical field of new energy vehicles, in particular to a new energy vehicle flywheel system based on a dual-driver system and a control method thereof.

Background

The new energy automobile adopts electric drive to replace the traditional fuel engine drive, and the energy source adopts a lithium battery or a fuel battery to replace the traditional petroleum fuel. In the actual operation of a vehicle, strong power can be required under various working conditions such as repeated acceleration, slope road surface, running speed and the like, high power density is required for an energy source, and meanwhile, the energy density is required to be achieved by the durable cruising ability required by the place where the vehicle runs for long distance or is not charged, so that the three-way electric system of the new energy whole vehicle needs to carry out reasonable matching design according to the required indexes of the whole vehicle such as hundred kilometers acceleration index, climbing index, high-speed cruising index, cruising index and the like to meet the performance of the whole vehicle.

High power density and high energy density are taken as mutual problems, and a matching process needs to be designed to be comprehensively considered:

1. the lithium battery comprehensively considers the design of the battery core, the module and the PACK to ensure the power and energy requirements of a vehicle, the vehicle can repeatedly accelerate and decelerate in the running process, particularly the rapid acceleration and deceleration, the battery needs large charge and discharge, the service life of the battery is seriously influenced, and simultaneously, the capacity is attenuated;

2. when charging, in order to protect the service life of a battery, a new energy source needs to perform reasonable charging management according to the SOC of the battery, and is generally divided into trickle charging, CC (constant current) charging and CV (constant current) charging modes, and particularly, under the CV mode charging, the charging current is smaller and smaller, and the charging time is too long;

3. the fuel cell has high energy density, but the power density is too low, the power density is improved by generally adopting a scheme of connecting a super capacitor or a lithium battery in parallel, the super capacitor has large volume, and the service life and the capacity attenuation are influenced by large C charge and discharge caused by the problem of repeated acceleration and deceleration;

4. the high-voltage source of the existing system has a failure mode, has sudden power loss, and seriously affects personnel safety particularly at high speed.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a new energy vehicle flywheel system based on a dual-driver system and a control method thereof, so as to reduce the high power density requirement of an energy source end.

In order to solve the technical problem, an embodiment of the present invention provides a new energy vehicle flywheel system based on a dual driver system, where the flywheel system includes an energy source, a dual driver, and a driving system, the flywheel system further includes a flywheel device electrically connected to the dual driver, the flywheel device is composed of a flywheel body and a motor, and the flywheel system includes:

the first startup module: when the automobile is started for the first time or is started after long-time parking, the dual-driver drives the flywheel device to operate in a constant-power running state and the rotating speed is fixed;

slow acceleration or cruise module: when the automobile is slowly accelerated or the automobile is cruising at a fixed speed, the dual-driver converts the electric energy of the energy source into mechanical energy through the driving system to drive the whole automobile, and in the process, the flywheel device is in a running standby state at all times;

fast acceleration or flywheel full module: when the automobile requires a rapid acceleration mode, the dual-driver brakes the flywheel device with the power required by the driving system to match the power requirement of the driving system, and if the power of the driving system is greater than the instantaneous power of the flywheel device at the moment, the energy source provides supplement; when the automobile is in a normal driving mode, if the flywheel device is in a full-rated state due to braking feedback, the dual-driver firstly controls the flywheel device to provide energy for a driving system, and the balance is reduced to the standby operation requirement;

the slow speed reduction module: when the automobile is slowly decelerated, the dual-driver converts the mechanical energy of the whole automobile into electric energy through the driving system and stores the electric energy into an energy source, and the flywheel device is continuously in a running standby state in the process;

sudden deceleration or flywheel underrun module: when the automobile needs a rapid deceleration mode, a driving system instantaneously brakes high-power energy, a dual driver drives a flywheel device with the braking power of the driving system to match the braking power of the driving system, and if the braking power of the driving system is larger than the absorption power of the flywheel device at the moment, the energy is absorbed by an energy source; when the automobile is in a normal feedback mode, if the flywheel device is in an underrated state due to driving, the dual-driver firstly meets the requirement that the driving system supplies energy to the flywheel system and increases the underrated flywheel device to the standby operation.

Correspondingly, the embodiment of the invention also provides a control method of the new energy automobile flywheel system based on the dual-driver system, which comprises the following steps:

a first starting step: when the automobile is started for the first time or is started after long-time parking, the dual-driver drives the flywheel device to operate in a constant-power running state and the rotating speed is fixed;

slow acceleration or cruise step: when the automobile is slowly accelerated or the automobile is cruising at a fixed speed, the dual-driver converts the electric energy of the energy source into mechanical energy through the driving system to drive the whole automobile, and in the process, the flywheel device is in a running standby state at all times;

quick acceleration or flywheel full-charge step: when the automobile requires a rapid acceleration mode, the dual-driver brakes the flywheel device with the power required by the driving system to match the power requirement of the driving system, and if the power of the driving system is greater than the instantaneous power of the flywheel device at the moment, the energy source provides supplement; when the automobile is in a normal driving mode, if the flywheel device is in a full-rated state due to braking feedback, the dual-driver firstly controls the flywheel device to provide energy for a driving system, and the balance is reduced to the standby operation requirement;

and a slow deceleration step: when the automobile is slowly decelerated, the dual-driver converts the mechanical energy of the whole automobile into electric energy through the driving system and stores the electric energy into an energy source, and the flywheel device is continuously in a running standby state in the process;

and (3) a step of sudden deceleration or flywheel underrun: when the automobile needs a rapid deceleration mode, a driving system instantaneously brakes high-power energy, a dual driver drives a flywheel device with the braking power of the driving system to match the braking power of the driving system, and if the braking power of the driving system is larger than the absorption power of the flywheel device at the moment, the energy is absorbed by an energy source; when the automobile is in a normal feedback mode, if the flywheel device is in an underrated state due to driving, the dual-driver firstly meets the requirement that the driving system supplies energy to the flywheel system and increases the underrated flywheel device to the standby operation.

The invention has the beneficial effects that: (1) the flywheel system is simple and reliable, the flywheel device is independent, only electrical signal correlation is carried out, and high-speed and high-power density of the flywheel system can be fully exerted; (2) the flywheel system disclosed by the invention is based on the power flow control of the dual-driver, and can smoothly filter high power in the running process of the whole vehicle, reduce the high-power requirement of an energy source and improve the safety and the service life of the energy source; (3) the flywheel system of the invention is based on the power flow control of the dual driver, and put forward the whole set of power flow management strategy; (4) when the flywheel system of the invention has a failure mode in an energy source or a power distribution power supply, the dual-driver system switches into a slope running function, thereby meeting the safety requirement; (5) the flywheel system disclosed by the invention is used for charging and storing energy for the constant power of the flywheel based on the dual-driver system in the charging mode, and replaces the CV charging mode, so that the charging time is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of a new energy vehicle flywheel system based on a dual-driver system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a new energy vehicle flywheel system based on a dual-driver system when a vehicle is started for the first time according to an embodiment of the invention.

Fig. 3 is a schematic structural diagram of a new energy vehicle flywheel system based on a dual-driver system when the vehicle is slowly accelerated or cruising according to an embodiment of the invention.

Fig. 4 is a schematic structural diagram of a flywheel system of a new energy vehicle based on a dual-driver system when the vehicle is suddenly accelerated or the flywheel is full according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a new energy vehicle flywheel system based on a dual-driver system when a vehicle decelerates slowly according to an embodiment of the invention.

Fig. 6 is a schematic structural diagram of a new energy vehicle flywheel system based on a dual-driver system when the vehicle suddenly decelerates or the flywheel is underrated according to an embodiment of the invention.

Fig. 7 is a schematic structural diagram of a new energy vehicle flywheel system based on a dual-driver system when the vehicle runs on a slope according to an embodiment of the invention.

Fig. 8 is a schematic structural diagram of a flywheel system of a new energy vehicle based on a dual-driver system when the vehicle is charged according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict, and the present invention is further described in detail with reference to the drawings and specific embodiments.

If directional indications (such as up, down, left, right, front, and rear … …) are provided in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the movement, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only used for descriptive purposes 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.

Referring to fig. 1, a new energy vehicle flywheel system based on a dual driver system according to an embodiment of the present invention includes an energy source (i.e., HVBAT & BMS in the figure), a dual driver (which can be implemented by 2 single drivers if the dual driver is replaced by the dual driver), a driving system, and a flywheel device electrically connected to the dual driver.

The flywheel device consists of a flywheel body and a motor. The flywheel device is formed by combining the flywheel body and the motor into a whole, realizes the functions of mutual conversion and storage of electric energy and mechanical energy, and has the characteristics of high power density, long service life, high efficiency and the like.

The new energy automobile flywheel system based on the dual-driver system comprises a first-time starting module, a slow acceleration or cruising module, a rapid acceleration or flywheel full-scale module, a slow deceleration module, a rapid deceleration or flywheel underscale module, a slope traveling module and a charging module.

The first startup module: referring to fig. 2, when the vehicle is started for the first time or after a long-time stop, the dual-driver first establishes the initial power storage of the flywheel system to drive the flywheel device to operate in a constant power operation state and at a fixed rotation speed state.

Slow acceleration or cruise module: referring to fig. 3, under the condition of slow acceleration or cruise at a fixed speed, the dual-driver system converts the electric energy of the energy source into mechanical energy through the driving system to drive the whole vehicle, and the flywheel device is in a running standby state all the time in the process.

Fast acceleration or flywheel full module: referring to fig. 4, when the rapid acceleration mode is required, the driving system needs to provide short-term high power, the dual-driving system preferentially brakes the flywheel device with the power required by the driving system to match the power requirement of the driving system, and if the power of the driving system is greater than the instantaneous power of the flywheel device at the moment, the energy source provides supplement, so that the energy source can always provide normal power requirement;

when the flywheel device is in a full-rated state due to brake feedback, the dual-drive system still preferentially controls the flywheel system to provide energy for the drive system in a normal drive mode, and the balance is reduced to the standby operation requirement.

The slow speed reduction module: referring to fig. 5, under the slow deceleration, the dual-driver system converts the mechanical energy of the entire vehicle into electrical energy through the driving system and stores the electrical energy into the high-voltage energy source, and the flywheel device is in a standby state during the process.

Sudden deceleration or flywheel underrun module: referring to fig. 6, when a rapid deceleration mode is required, the driving system instantaneously brakes high-power energy, the dual-driving system preferentially drives the flywheel device with the braking power of the driving system to match the braking power of the driving system, and if the braking power of the driving system is greater than the absorption power of the flywheel device at the moment, the energy source absorbs the braking power, so that the energy source can be ensured to be always in a low-power feedback mode;

when the flywheel device is in an underrated state due to driving, the dual-drive system still preferentially meets the requirement that the driving system provides energy for the flywheel system and increases the amount of the energy to the standby operation under a normal feedback mode.

The slope module: referring to fig. 7, when the energy source system fails or the front-end power distribution function fails, the dual-driver cannot receive energy, at this time, the dual-driver establishes internal energy circulation, and controls the flywheel device to provide energy to the driving system first, so that the normal driving and braking requirements of the entire vehicle can be met within a certain distance, the slope running function under the energy source failure mode is realized, and the safety is ensured.

A charging module: referring to fig. 8, in the charging mode, trickle charging and CC charging are performed first, after CC charging is completed, the dual driver is switched into the constant power charging mode (CP mode) of the flywheel device, and when the flywheel device is at full charge, charging is stopped; energy stored in the flywheel device is fed back to the energy source through the dual driver in a constant voltage feeding mode, and if the process needs to be driven, the dual driver firstly converts the energy to a driving system for driving.

The charging mode of the energy source is to ensure full charge by first constant current and then constant voltage, and the constant voltage charging time is long and slow.

The new energy automobile flywheel system based on the dual-driver system is simple and reliable, only the flywheel device is added to the original system, and no mechanical association exists. In the driving mode: when the whole vehicle is subjected to rapid acceleration and rapid deceleration, the dual-driver system and the flywheel device are reasonably adjusted to always enable the energy source to be in a smooth charging or discharging mode, so that the safety and the service life of the energy source are ensured, and meanwhile, when the high-voltage energy source fails, a slope function can be performed. In the charging mode: after a CC charging mode and a CV mode are cancelled, the dual-driver system switches the charging equipment to charge and store the flywheel at constant power, the original CV charging mode is replaced by the high-power charging process, and the charging time is greatly saved.

Referring to fig. 1 to 8, a control method of a new energy vehicle flywheel system based on a dual driver system according to an embodiment of the present invention includes a first startup step, a slow acceleration or cruise step, a rapid acceleration or full flywheel step, a slow deceleration step, a rapid deceleration or insufficient flywheel step, a hill-climbing step, and a charging step.

And a first starting step, starting the engine after the engine is started for the first time or is stopped for a long time, and establishing initial power storage of the flywheel device by the dual drivers to drive the flywheel device to operate in a constant power operation state and under a fixed rotating speed state.

And slowly accelerating or cruising, namely converting the electric energy of the energy source into mechanical energy by the double drivers through the driving system to drive the whole automobile when the automobile is slowly accelerated or the automobile is cruising at a fixed speed, wherein the flywheel device is in a running standby state all the time in the process.

Quick acceleration or flywheel full-charge step: when the automobile requires a rapid acceleration mode, the dual-driver brakes the flywheel device with the power required by the driving system to match the power requirement of the driving system, and if the power of the driving system is greater than the instantaneous power of the flywheel device at the moment, the energy source provides supplement; when the automobile is in a normal driving mode, if the flywheel device is in a full-rated state due to braking feedback, the dual-driver firstly controls the flywheel device to provide energy for the driving system, and the balance is reduced to the standby operation requirement.

And a slow deceleration step: when the automobile is slowly decelerated, the dual-driver converts the mechanical energy of the whole automobile into electric energy through the driving system and stores the electric energy into the energy source, and the flywheel device is continuously in a running standby state in the process.

And (3) a step of sudden deceleration or flywheel underrun: when the automobile needs a rapid deceleration mode, a driving system instantaneously brakes high-power energy, a dual driver drives a flywheel device with the braking power of the driving system to match the braking power of the driving system, and if the braking power of the driving system is larger than the absorption power of the flywheel device at the moment, the energy is absorbed by an energy source; when the automobile is in a normal feedback mode, if the flywheel device is in an underrated state due to driving, the dual-driver firstly meets the requirement that the driving system supplies energy to the flywheel system and increases the underrated flywheel device to the standby operation.

A slope traveling step: when the energy source fails or the front-end power distribution function fails, and the dual-driver cannot receive energy, the dual-driver firstly controls the flywheel device to provide energy for the driving system, so that the slope running function under the energy source failure mode is realized, and the safety is ensured.

A charging step: trickle charging and CC charging are carried out firstly in a charging mode, after the CC charging is finished, a dual driver is switched into a constant power charging mode of the flywheel device, and when the flywheel device is full, the charging is stopped; energy stored in the flywheel device is fed back to the energy source through the dual driver in a constant voltage feeding mode, and if the driving is required in the process, the dual driver firstly converts the energy to the driving system for driving.

The invention relates the flywheel device to the electric signal by adopting the dual-driver, and based on the energy management strategy of the dual-driver system, the flywheel device absorbs/releases the instantaneous high power in the system, and filters the power flow smoothly, thereby reducing the high power density requirement of the energy source end.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.