CN112060934A - Charge state maintaining method and device, vehicle controller and electric vehicle - Google Patents

Charge state maintaining method and device, vehicle controller and electric vehicle Download PDF

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CN112060934A
CN112060934A CN202010995427.5A CN202010995427A CN112060934A CN 112060934 A CN112060934 A CN 112060934A CN 202010995427 A CN202010995427 A CN 202010995427A CN 112060934 A CN112060934 A CN 112060934A
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driving state
parameter
power generation
vehicle
determining
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CN112060934B (en
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邵军杰
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Beijing Co Wheels Technology Co Ltd
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Beijing Co Wheels Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
    • B60L50/62—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles charged by low-power generators primarily intended to support the batteries, e.g. range extenders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/13—Maintaining the SoC within a determined range
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The embodiment of the disclosure provides a state of charge maintaining method and device, a vehicle controller and an electric vehicle. The method comprises the following steps: acquiring a driving state parameter of a driver and a vehicle state parameter of a vehicle, wherein the driving state parameter is used for representing the smoothness degree of the driving state of the driver; determining a power generation parameter corresponding to the vehicle state parameter; and determining a power generation strategy corresponding to the driving state parameter according to the power generation parameter and the driving state parameter so as to enable the range extender of the vehicle to generate power according to the power generation strategy. According to the method and the device, the power generation strategy corresponding to the driving state parameter is determined by acquiring the vehicle state parameter and the driving state parameter, so that the final power generation strategy is not only related to the vehicle state parameter but also related to the driving state. Therefore, the final power generation strategy can meet the requirements of the actual working conditions of the vehicle, and the range extender of the vehicle can maintain the SOC of the battery when generating power according to the final power generation strategy, so that the dynamic property of the vehicle is improved.

Description

Charge state maintaining method and device, vehicle controller and electric vehicle
Technical Field
The disclosure relates to the field of extended range hybrid electric vehicles, in particular to a state of charge maintaining method and device, a vehicle controller and an electric vehicle.
Background
Hybrid Electric Vehicles (HEV) are vehicles in which a Vehicle drive system is combined by two or more single drive systems capable of operating simultaneously, and the driving power of the Vehicle is provided by the single drive system alone or together according to the actual driving state of the Vehicle, and generally refer to Hybrid Electric Vehicles (HEV). The hybrid electric vehicle has the characteristics of energy conservation and low emission.
The range-extended hybrid electric vehicle is a series plug-in hybrid electric vehicle which generates electricity through a range extender, and the range extender comprises a generator and an internal combustion engine. Unlike the common parallel hybrid vehicles, the extended range hybrid vehicle is driven by a motor only, and is not driven by an internal combustion engine. For extended range hybrid vehicles, the only function of the internal combustion engine is to drive the generator to generate electricity, charge the battery, drive the motor, or provide energy to other electrical devices, such as electrical devices, including: air conditioning, heating and/or 12v power.
At present, extended range hybrid electric vehicles mostly evaluate the maintaining performance Of the vehicle power battery State Of Charge (SOC) based on certain standard working conditions (for example, New European Driving Cycle (NEDC for short) and the world Light vehicle emission testing procedure (WLTC for short)) working conditions. Therefore, the purpose of the range extender power generation strategy of the range-extended hybrid electric vehicle is to maintain the SOC under the standard working condition.
The system runs under the standard working condition, the SOC maintenance is better, and the problem of continuous reduction of the SOC can not occur during stable driving.
However, the inventors have studied and found that: when the real vehicle is operated, because the driving condition that different drivers 'driving habits caused is great with above-mentioned standard operating mode difference, can appear the condition that can't keep SOC when driving violently, lead to power battery SOC to last the decline, make vehicle dynamic variation, the condition of the vehicle nest of lying prone even appears.
Disclosure of Invention
The present disclosure is directed to a state of charge maintaining method, a state of charge maintaining device, a vehicle controller, and an electric vehicle, which are capable of solving at least one of the above-mentioned technical problems. The specific scheme is as follows:
in a first aspect, the present disclosure provides a state of charge maintenance method comprising:
acquiring a driving state parameter of a driver and a vehicle state parameter of a vehicle, wherein the driving state parameter is used for representing the smoothness degree of the driving state of the driver;
determining a power generation parameter corresponding to the vehicle state parameter;
and determining a power generation strategy corresponding to the driving state parameter according to the power generation parameter and the driving state parameter so as to enable the range extender of the vehicle to generate power according to the power generation strategy.
Optionally, the determining, according to the power generation parameter and the driving state parameter, a power generation strategy corresponding to the driving state parameter includes:
determining a compensation parameter corresponding to the degree of smoothness based on the degree of smoothness of the driving state represented by the driving state parameter;
and determining the power generation strategy according to the power generation parameters and the compensation parameters.
Optionally, the determining the power generation strategy according to the power generation parameter and the compensation parameter includes:
acquiring the power generation power represented by the power generation parameters;
and taking the product of the generated power and a compensation parameter as the power generation strategy.
Optionally, the determining a compensation parameter corresponding to the driving state based on the degree of smoothness of the driving state represented by the driving state parameter includes:
when the driving state parameter is larger than a preset threshold value, determining the quotient of the driving state parameter and the preset threshold value as the compensation parameter; the preset threshold is the mean value of normal distribution which takes driving state parameters as random variables under standard working conditions;
or
And determining a compensation parameter corresponding to the driving state parameter according to the corresponding relation between the preset stability degree and the preset compensation parameter.
Optionally, the state of charge maintaining method further includes:
and when the driving state parameter is not larger than a preset threshold value, determining that the compensation parameter is 1.
Optionally, the obtaining the driving state parameter of the driver includes:
acquiring the speed and the acceleration of the vehicle at the current moment;
and determining the product of the speed and the acceleration as the driving state parameter.
Optionally, the obtaining the driving state parameter of the driver includes:
acquiring the speed and the acceleration of the vehicle at a plurality of moments in a preset time period, and determining driving state parameters corresponding to the moments, wherein the driving state parameter corresponding to each moment is the product of the speed and the acceleration of the vehicle at the moment;
and determining the average value of the driving state parameters corresponding to each moment, and taking the average value as the driving state parameter of the driver.
Optionally, if the vehicle state parameters include a speed, an accelerator opening degree, and a state of charge of the vehicle, the determining the power generation parameters corresponding to the vehicle state parameters includes:
and determining the power generation parameters corresponding to the vehicle state parameters based on the corresponding relation among the speed, the opening degree of the accelerator pedal, the state of charge and preset power generation parameters.
In a second aspect, the present disclosure provides a state of charge maintaining apparatus comprising:
a state parameter acquiring unit for acquiring a driving state parameter of a driver and a vehicle state parameter of a vehicle, the driving state parameter being used for representing a degree of smoothness of a driving state of the driver;
a power generation parameter determination unit for determining a power generation parameter corresponding to the vehicle state parameter;
and the power generation strategy determining unit is used for determining a power generation strategy corresponding to the driving state parameter according to the power generation parameter and the driving state parameter so as to enable the range extender of the vehicle to generate power according to the power generation strategy.
Optionally, the power generation strategy determining unit includes:
the compensation parameter determining subunit is used for determining a compensation parameter corresponding to the stability degree based on the stability degree of the driving state represented by the driving state parameter;
and the power generation strategy determining subunit is used for determining the power generation strategy according to the power generation parameters and the compensation parameters.
Optionally, the power generation strategy determining subunit is specifically configured to:
acquiring the power generation power represented by the power generation parameters;
and taking the product of the generated power and a compensation parameter as the power generation strategy.
Optionally, the compensation parameter determining subunit is specifically configured to:
when the driving state parameter is larger than a preset threshold value, determining the quotient of the driving state parameter and the preset threshold value as the compensation parameter; the preset threshold is the mean value of normal distribution which takes driving state parameters as random variables under standard working conditions;
or
And determining a compensation parameter corresponding to the driving state parameter according to the corresponding relation between the preset stability degree and the preset compensation parameter.
Optionally, the compensation parameter determining subunit is further specifically configured to:
and when the driving state parameter is not larger than a preset threshold value, determining that the compensation parameter is 1.
Optionally, the state parameter obtaining unit is specifically configured to:
acquiring the speed and the acceleration of the vehicle at the current moment;
and determining the product of the speed and the acceleration as the driving state parameter.
Optionally, the state parameter obtaining unit is specifically configured to:
acquiring the speed and the acceleration of the vehicle at a plurality of moments in a preset time period, and determining driving state parameters corresponding to the moments, wherein the driving state parameter corresponding to each moment is the product of the speed and the acceleration of the vehicle at the moment;
and determining the average value of the driving state parameters corresponding to each moment, and taking the average value as the driving state parameter of the driver.
Optionally, the vehicle state parameters include a speed, an accelerator opening degree, and a state of charge of the vehicle, and the power generation parameter determination unit is specifically configured to:
and determining the power generation parameters corresponding to the vehicle state parameters based on the corresponding relation among the speed, the opening degree of the accelerator pedal, the state of charge and preset power generation parameters.
In a third aspect, the present disclosure provides a vehicle controller having stored thereon one or more instructions that, when executed by the vehicle controller, implement the method of any of the first aspects.
In a fourth aspect, the present disclosure provides an electric vehicle comprising the vehicle controller according to the third aspect.
Compared with the prior art, the scheme of the embodiment of the disclosure at least has the following beneficial effects:
the embodiment of the disclosure provides a charge state maintaining scheme, which determines a power generation strategy corresponding to a driving state parameter by acquiring a vehicle state parameter of a vehicle and the driving state parameter of a driver, so that the final power generation strategy is not only related to the vehicle state parameter any more, but also related to the driving state. Because the driving state parameter is used for representing the stability of the driving behavior of the driver, the final power generation strategy can better meet the requirement of the actual working condition of the vehicle, and the range extender of the vehicle can maintain the SOC of the battery when generating power according to the final power generation strategy, so that the dynamic property of the vehicle is improved.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements. It should be understood that the drawings are schematic and that elements and elements are not necessarily drawn to scale. In the drawings:
FIG. 1 illustrates a normal distribution plot of driving state parameters under a NEDC condition according to an embodiment of the present disclosure;
FIG. 2 shows a normal distribution diagram of driving state parameters under WLTC conditions according to an embodiment of the present disclosure;
FIG. 3 is a normal distribution diagram of driving state parameters under actual vehicle conditions according to an embodiment of the disclosure;
FIG. 4 shows an electronic device connection configuration diagram of an embodiment of the present disclosure;
FIG. 5 illustrates a method flow for state of charge maintenance according to an embodiment of the present disclosure;
FIG. 6 illustrates a method flow diagram for state of charge maintenance according to another embodiment of the present disclosure;
FIG. 7 illustrates a method flow for state of charge maintenance according to yet another embodiment of the present disclosure;
fig. 8 shows a schematic diagram of a state of charge maintaining apparatus provided by an embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.
The inventor researches and discovers that: at present, the power generation strategy of the range extender hybrid electric vehicle is to satisfy the purpose of maintaining the SOC under the standard working condition. For example, the generated power of the range extender is obtained based on the accelerator opening, the running vehicle speed, and the SOC, and then the range extender generates power with the generated power as the target power.
Normally, three vehicle state parameters, that is, the accelerator opening degree, the traveling vehicle speed, and the SOC, have a positive correlation with the generated power of the range extender. Namely, the larger the opening degree of an accelerator pedal and the larger the vehicle speed, the larger the generated power; the smaller the accelerator opening and the smaller the vehicle speed, the smaller the generated power. However, when the actual vehicle runs, because the driving habits of different drivers are different, the driving condition caused by each driving is greatly different from the standard working condition, so that the SOC cannot be maintained during violent driving, the SOC of the power battery is continuously reduced, the dynamic performance of the vehicle is poor, and even the nest of the vehicle is prone to occur.
In order to solve the above problem, the inventor proposes to represent the smoothness of the driving state of the driver by the driving state parameter, in the embodiment of the present disclosure, the larger the driving state parameter is, the lower the smoothness is; the smaller the driving state parameter, the higher the smoothness. In one embodiment, the inventors determine driving state parameters based on the speed and acceleration of the vehicle, such as: driving state parameter is speed x acceleration, wherein the unit of speed is m/s, and the unit of acceleration is m/s2The unit of the driving state parameter is m2/s3。
The inventor researches and discovers that: in some scenes, the driving state parameters under the actual vehicle working conditions are greater than the driving state parameters under the standard working conditions, so that the driving state of the driver under the actual vehicle working conditions in the scenes is low in smoothness and is violent in driving. If the power generation strategy in the prior art is adopted, the SOC maintenance under the actual working condition is poorer than that under the standard working condition. This is explained in detail below with reference to fig. 1-3.
FIG. 1 is a normal distribution diagram of driving condition parameters under one standard condition (NEDC condition) provided by the embodiments of the present disclosure; FIG. 2 shows a normal distribution diagram of driving state parameters under another standard condition (WLTC condition) provided by the embodiments of the present disclosure. The abscissa is a driving state parameter (that is, the driving state parameter is a random variable), and the ordinate is a frequency distribution of the driving state parameter under a statistical standard working condition. The mean (i.e., median or expectation) refers to the abscissa interval in which the axis of symmetry of the normal distribution curve lies.
As shown in FIG. 1, under the NEDC condition, the median of the driving state parameters is 4m2/s3I.e. most of the driving state parameters under the NEDC working condition are 4m2/s3Nearby.
As shown in FIG. 2, under WLTC condition, the median of driving state parameters is 5.7m2/s3That is, most driving state parameters under the WLTC working condition are 5.7m2/s3Nearby.
It can be understood that from the distribution of the driving state parameters under NEDC and WLTC conditions, the driving state parameter under WLTC condition is higher than the driving state parameter under NEDC condition. It should also be understood that the disclosed embodiments are not limited to NEDC and WLTC, but other operating conditions that are subject to national, world, or industry organization standards are all within the scope of the disclosed embodiments. It should also be understood that certain conditions may not be listed as a national, world, or industry organization standard, which may be a condition set by some person, business, or organization, and are also included within the scope of the embodiments of the present disclosure.
FIG. 3 shows a normal distribution diagram of driving state parameters under actual vehicle conditions in an actual scene. The abscissa is a driving state parameter, and the ordinate is statistical frequency distribution of the driving state parameter of the real vehicle. As can be seen, the median of the driving state parameters under the actual vehicle working condition is 21.4m2/s3That is, the actual vehicle driving state parameter is mostly 21.4m2/s3In the vicinity, this value is much greater than the median of the driving state parameters under NEDC and WLTC conditions.
In conjunction with fig. 1-3, it can be seen that: the median of the driving state parameters under the actual vehicle working condition is larger than the median of the driving state parameters under the NEDC and WLTC working conditions, which can indicate that the driving state parameters at all times under the actual vehicle working condition are larger than the driving state parameters under the WLTC working condition. Compared with the working conditions of NEDC and WLTC, the driving state of the driver under the working condition of the real vehicle is lower in smoothness. If the power generation strategy in the prior art is adopted, the SOC maintenance under the actual working condition is poorer than that under the working conditions of the NEDC and the WLTC.
In order to maintain the SOC under each stationary degree, the embodiment of the present disclosure provides at least one SOC maintaining scheme, and determines the power generation strategy corresponding to the driving state parameter by obtaining the vehicle state parameter of the vehicle and the driving state parameter of the driver, so that the final power generation strategy is no longer only related to the vehicle state parameter, but also related to the driving state. Because the driving state parameter is used for representing the stability of the driving behavior of the driver, the final power generation strategy can better meet the requirement of the actual working condition of the vehicle, and the range extender of the vehicle can maintain the SOC of the battery when generating power according to the final power generation strategy, so that the dynamic property of the vehicle is improved.
Fig. 4 shows the operating principle of the power generation strategy, i.e. power generation strategy — generated power × compensation parameter.
It can be seen from the above that the generated power in the embodiment of the present disclosure is the vehicle state parameter and the corresponding power generation parameter, the power generation strategy in the embodiment of the present disclosure is to compensate the power generation parameter, and the adopted compensation strategy is that the driving state parameter and the compensation parameter are in a positive correlation relationship, that is, the larger the driving state parameter is, the larger the compensation parameter is, the smaller the driving state parameter is, and the smaller the compensation parameter is. The scheme provided by the embodiment of the disclosure has corresponding power generation strategies when the stability degree is different (namely stable driving and violent driving): when the stability degree is higher, the driving behavior meets the standard working condition, the maintenance of the SOC is higher, and at the moment, the power generation is carried out by the power generation strategy under the standard working condition; when the stability degree is low, the power generation strategy under the standard working condition is compensated, the final power generation power is improved, and the SOC is maintained. Therefore, the scheme provided by the embodiment of the disclosure can be suitable for actual working conditions, the final power generation strategy can meet the requirements of the actual working conditions of the vehicle, and the range extender of the vehicle can maintain the SOC of the battery when generating power according to the final power generation strategy, so that the dynamic property of the vehicle is improved.
Alternative embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Referring to fig. 5, a flowchart of a state of charge maintaining method according to an embodiment of the present disclosure is shown, where the method is applicable to a vehicle controller, and the vehicle controller and a range extender of a vehicle can communicate. As shown in fig. 5, the state of charge maintenance method includes at least 400 and 404.
400. The driving state parameter of the driver and the vehicle state parameter of the vehicle are acquired. Wherein the driving state parameter is used for representing the smoothness degree of the driving state of the driver.
In the embodiment of the present disclosure, whether the driving behavior of the driver is smooth is represented by the degree of smoothness of the driving state. The higher the smoothness degree is, the more smoothness the driving behavior of the driver is; the lower the smoothness, the more violent or fluctuating the driving behavior of the driver. In general, smooth driving refers to a driver's driving behavior that is relatively smooth; the violent driving is opposite to the steady driving, which means that the driving is relatively low in steady degree and relatively high in fluctuation degree.
402. And determining the power generation parameters corresponding to the vehicle state parameters.
In some embodiments, the vehicle state parameter and the power generation parameter have a corresponding relationship, and the corresponding relationship is stored in a storage space of the vehicle controller, or can be stored in a separate storage space, and the separate storage space is electrically connected with the vehicle controller, and the vehicle controller can read data stored in the separate storage space. In one embodiment, the correspondence may be represented by table 1 below.
TABLE 1
Vehicle state parameter Parameters of power generation
Vehicle state parameter 1 Power generation parameter 1
Vehicle state parameter 2 Power generation parameter 2
Vehicle state parameter 3 Power generation parameters 3
Vehicle state parameter 4 Power generation parameter 4
404. And determining a power generation strategy corresponding to the driving state parameter according to the power generation parameter and the driving state parameter so that the range extender of the vehicle generates power according to the power generation strategy.
In the disclosed embodiment, when the vehicle controller determines the power generation strategy, the power generation strategy may be sent to a range extender of the vehicle. And the range extender of the vehicle receives the power generation strategy and generates power according to the power generation strategy.
The power generation strategy corresponding to the driving state parameter is determined by acquiring the vehicle state parameter of the vehicle and the driving state parameter of the driver, so that the final power generation strategy is not only related to the vehicle state parameter but also related to the driving state. Because the driving state parameter is used for representing the stability of the driving behavior of the driver, the final power generation strategy can better meet the requirement of the actual working condition of the vehicle, and the range extender of the vehicle can maintain the SOC of the battery when generating power according to the final power generation strategy, so that the dynamic property of the vehicle is improved.
Referring to fig. 6, a flowchart of a state of charge maintaining method according to another embodiment of the present disclosure is shown, where the method is applicable to a vehicle controller, and the vehicle controller is capable of communicating with a range extender of a vehicle. As shown in fig. 6, the state of charge maintaining method at least comprises 500-.
500. The driving state parameter of the driver and the vehicle state parameter of the vehicle are acquired.
In the embodiment of the present disclosure, the driving state parameters are used to represent the smoothness of the driving state of the driver, and the vehicle state parameters include the speed, the accelerator opening degree, and the state of charge of the vehicle.
In one embodiment, the speed of the vehicle may be obtained by a speed sensor, the accelerator opening may be obtained by a position sensor mounted at an accelerator pedal, and the state of charge may be determined by a ratio of the obtained remaining capacity to the capacity in a fully charged state.
In one embodiment, the driving state parameters may be determined from the speed and acceleration of the vehicle, for example: driving state parameter is speed x acceleration, wherein the unit of speed is m/s, and the unit of acceleration is m/s2The unit of the driving state parameter is m2/s3. In one embodiment, the driving state parameter may be obtained by:
acquiring the speed and the acceleration of the vehicle at the current moment;
and determining the product of the speed and the acceleration as the driving state parameter.
In other embodiments, the driving state parameter may also be obtained by:
acquiring the speed and the acceleration of the vehicle at a plurality of moments in a preset time period, and determining the driving state parameter corresponding to each moment, wherein the driving state parameter corresponding to each moment is the product of the speed and the acceleration of the vehicle at the moment;
and determining the average value of the driving state parameters corresponding to each moment, and taking the average value as the driving state parameter of the driver.
In the embodiment of the present disclosure, whether the driving behavior of the driver is smooth is represented by the degree of smoothness of the driving state. The higher the smoothness degree is, the more smoothness the driving behavior of the driver is; the lower the smoothness, the more violent or fluctuating the driving behavior of the driver. In general, smooth driving refers to a driver's driving behavior that is relatively smooth; the violent driving is opposite to the steady driving, which means that the driving is relatively low in steady degree and relatively high in fluctuation degree.
In some embodiments, when the driving state parameter is greater than the preset threshold, it is considered that the driving state parameter indicates that the driving behavior of the driver is relatively smooth, i.e., the driving behavior of the driver is violent driving. When the driving state parameter is not greater than the preset threshold, the driving state parameter is considered to represent that the smoothness of the driving behavior of the driver is higher, namely the driving behavior of the driver is smooth driving.
In some embodiments, the preset threshold is a mean value of a normal distribution with the driving state parameter as a random variable under the standard working condition. In one embodiment, the standard operating condition is NEDC; in another embodiment, the standard operating condition is WLTC. With reference to fig. 1-2, the following describes specific schemes for determining the preset threshold under different standard conditions.
As shown in FIG. 1, under the NEDC condition, the median of the driving state parameters is 4m2/s3I.e. most of the driving state parameters under the NEDC working condition are 4m2/s3Nearby. The preset threshold under the NEDC condition may be set to 4m2/s3。
As shown in FIG. 2, under WLTC condition, the median of driving state parameters is 5.7m2/s3That is, most driving state parameters under the WLTC working condition are 5.7m2/s3Nearby. The preset threshold value under the WLTC working condition can be set to be 4m2/s3。
In one embodiment, as shown in fig. 3, most driving state parameters under the actual vehicle condition in the scene are greater than the median (preset threshold) of the driving state parameters under the NEDC or WLTC condition, and the driving state of the driver under the actual vehicle condition is less stable than under the NEDC and WLTC conditions, and is driving violently.
502. And determining the power generation parameters corresponding to the vehicle state parameters based on the corresponding relation between the speed, the opening degree of the accelerator pedal and the state of charge and the preset power generation parameters.
In some embodiments, the speed, the accelerator opening and the state of charge of the vehicle have a correspondence relationship with the power generation parameters, and the correspondence relationship is stored in a storage space of the vehicle controller, or may be stored in a separate storage space, which is electrically connected with the vehicle controller, and the vehicle controller can read data stored in the separate storage space. In one embodiment, the correspondence may be represented by table 2 below.
TABLE 2
Speed of vehicle Opening degree of accelerator pedal State of charge Parameters of power generation
Vehicle speed
1 Opening degree 1 State of charge 1 Power generation parameter 1
Vehicle speed 2 Opening 2 State of charge 2 Power generation parameter 2
Vehicle speed 3 Opening degree 3 State of charge 3 Power generation parameters 3
Vehicle speed 4 Opening degree 4 State of charge 4 Power generation parameter 4
504. And determining a compensation parameter corresponding to the smoothness degree based on the smoothness degree of the driving state represented by the driving state parameter.
In one embodiment, the compensation parameter is obtained by: when the driving state parameter is larger than a preset threshold value, determining the quotient of the driving state parameter and the preset threshold value as a compensation parameter; the preset threshold is the mean value of normal distribution which takes the driving state parameter as a random variable under a standard working condition.
In another embodiment, the compensation parameter has a corresponding relationship with the stationary degree, and the compensation parameter is obtained by: and determining the compensation parameters corresponding to the driving state parameters according to the corresponding relation between the preset stability degree and the preset compensation parameters.
506. And determining a power generation strategy according to the power generation parameters and the compensation parameters.
According to the embodiment of the disclosure, the compensation parameter corresponding to the driving state is determined by acquiring the vehicle state parameter of the vehicle and the driving state parameter of the driver, so that the final power generation strategy is not only related to the vehicle state parameter, but also related to the driving state. Because the driving state parameter is used for representing the stability of the driving behavior of the driver, the final power generation strategy can better meet the requirement of the actual working condition of the vehicle, and the range extender of the vehicle can maintain the SOC of the battery when generating power according to the final power generation strategy, so that the dynamic property of the vehicle is improved.
Referring to fig. 7, a flowchart of a state of charge maintaining method according to another embodiment of the disclosure is shown. The method is applicable to a vehicle controller that is capable of communicating with a range extender of a vehicle. As shown in fig. 7, the state of charge maintaining method at least comprises the following steps 601 and 606.
601. And acquiring the speed, the opening degree of an accelerator pedal and the state of charge of the vehicle at the current moment.
602. And determining the generating power corresponding to the vehicle state parameters based on the corresponding relation between the speed, the opening degree of the accelerator pedal and the state of charge and the preset generating power.
Specifically, the corresponding relation between the speed, the accelerator pedal opening, the state of charge and the preset power generation is a power generation strategy under a standard working condition, and three vehicle state parameters, namely the accelerator pedal opening, the running vehicle speed and the SOC, are in positive correlation with the power generation power of the range extender. Namely, the larger the opening degree of an accelerator pedal and the larger the vehicle speed, the larger the generated power; the smaller the accelerator opening and the smaller the vehicle speed, the smaller the generated power.
In general, the power generation strategy under the standard working condition is suitable for the power generation strategy when the smoothness degree is higher (namely, smooth driving).
603. And acquiring the speed and the acceleration of the vehicle at the current moment, and determining the product of the speed and the acceleration as a driving state parameter.
604. If the driving state parameter is larger than the preset threshold, the driving state represented by the driving state parameter is considered to be low in stability degree and is violent driving, and at the moment, the quotient of the driving state parameter and the preset threshold is determined as a compensation parameter. 606 is performed.
In the embodiment of the present disclosure, the preset threshold is a mean value of normal distribution using the driving state parameter as a random variable under the standard working condition. Because the driving state parameter representation stability degree under the standard working condition is higher (namely stable driving), the power generation strategy needs to be compensated when the stability degree is lower (namely violent driving), the final power generation power is improved, and the SOC is maintained.
The compensation strategy adopted by the embodiment of the disclosure is that the driving state parameter and the compensation parameter are in positive correlation, namely, the larger the driving state parameter is, the larger the compensation parameter is, the smaller the driving state parameter is, and the smaller the compensation parameter is. Specifically, the quotient of the driving state parameter and the preset threshold may be used as the compensation parameter.
In an application scenario, the distribution diagram of the driving state parameters is shown in fig. 3, and most of the driving state parameters under the actual vehicle condition in the scenario are greater than the median (preset threshold) of the driving state parameters under the WLTC condition, so that the driving state of the driver under the actual vehicle condition is less stable than that under the WLTC condition, and the driver is driven violently. If the driving state parameter determined at the current moment is 21.4m2/s3The determined compensation parameters are: 21.4/5.7.
605. If the driving state parameter is not greater than the preset threshold value, the driving state represented by the driving state parameter is considered to be in a high stability degree, the driving is in a stable state, and the compensation parameter is determined to be 1. 606 is performed.
The driving state parameter is not greater than the preset threshold value, which indicates that the driving state at the moment meets the standard working condition, the stability degree is higher at the moment, and the SOC maintainability is higher, so that the compensation strategy at the moment is that the power generation strategy is not required to be compensated, namely the compensation parameter is 1.
606. And taking the product of the generated power and the compensation parameter as a power generation strategy.
From the above, it can be seen that the scheme that this disclosure embodiment provided all has corresponding power generation strategy when the stationary degree is different (i.e. stationary driving, fierce driving): when the stability degree is higher, the driving behavior meets the standard working condition, the maintenance of the SOC is higher, and at the moment, the power generation is carried out by the power generation strategy under the standard working condition; when the stability degree is low, the power generation strategy under the standard working condition is compensated, the final power generation power is improved, and the SOC is maintained. Therefore, the scheme provided by the embodiment of the disclosure can be suitable for actual working conditions, the final power generation strategy can meet the requirements of the actual working conditions of the vehicle, and the range extender of the vehicle can maintain the SOC of the battery when generating power according to the final power generation strategy, so that the dynamic property of the vehicle is improved.
Referring to fig. 8, an embodiment of the present disclosure provides a state of charge maintaining apparatus, including:
a state parameter acquiring unit 800 for acquiring a driving state parameter of the driver and a vehicle state parameter of the vehicle, the driving state parameter being used for representing a degree of smoothness of the driving state of the driver;
a power generation parameter determination unit 801 for determining a power generation parameter corresponding to the vehicle state parameter;
the power generation strategy determining unit 802 is configured to determine a power generation strategy corresponding to the driving state parameter according to the power generation parameter and the driving state parameter, so that the range extender of the vehicle generates power according to the power generation strategy.
Optionally, the power generation strategy determining unit 802 includes:
the compensation parameter determining subunit is used for determining a compensation parameter corresponding to the stability degree based on the stability degree of the driving state represented by the driving state parameter;
and the power generation strategy determining subunit is used for determining the power generation strategy according to the power generation parameters and the compensation parameters.
Optionally, the power generation strategy determining subunit is specifically configured to:
acquiring power generation power represented by power generation parameters;
and taking the product of the generated power and the compensation parameter as a power generation strategy.
Optionally, the compensation parameter determining subunit is specifically configured to:
when the driving state parameter is larger than a preset threshold value, determining the quotient of the driving state parameter and the preset threshold value as a compensation parameter; the preset threshold value is the mean value of normal distribution which takes driving state parameters as random variables under standard working conditions;
or
And determining the compensation parameters corresponding to the driving state parameters according to the corresponding relation between the preset stability degree and the preset compensation parameters.
Optionally, the compensation parameter determining subunit is further specifically configured to:
and when the driving state parameter is not greater than the preset threshold value, determining the compensation parameter to be 1.
Optionally, the state parameter obtaining unit 800 is specifically configured to:
acquiring the speed and the acceleration of the vehicle at the current moment;
and determining the product of the speed and the acceleration as the driving state parameter.
Optionally, the state parameter obtaining unit 800 is specifically configured to:
acquiring the speed and the acceleration of the vehicle at a plurality of moments in a preset time period, and determining the driving state parameter corresponding to each moment, wherein the driving state parameter corresponding to each moment is the product of the speed and the acceleration of the vehicle at the moment;
and determining the average value of the driving state parameters corresponding to each moment, and taking the average value as the driving state parameter of the driver.
Optionally, the vehicle state parameters include a speed of the vehicle, an opening degree of an accelerator pedal, and a state of charge, and the power generation parameter determining unit 801 is specifically configured to:
and determining the power generation parameters corresponding to the vehicle state parameters based on the corresponding relation between the speed, the opening degree of the accelerator pedal and the state of charge and the preset power generation parameters.
The disclosed embodiments also provide a vehicle controller having one or more instructions stored thereon, the one or more instructions, when executed by the vehicle controller, implementing any of the methods provided by the foregoing embodiments.
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), systems on a chip (SOCs), Complex Programmable Logic Devices (CPLDs), and the like.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents does not depart from the spirit of the disclosure. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.
Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (15)

1. A state of charge maintenance method, comprising:
acquiring a driving state parameter of a driver and a vehicle state parameter of a vehicle, wherein the driving state parameter is used for representing the smoothness degree of the driving state of the driver;
determining a power generation parameter corresponding to the vehicle state parameter;
and determining a power generation strategy corresponding to the driving state parameter according to the power generation parameter and the driving state parameter so as to enable the range extender of the vehicle to generate power according to the power generation strategy.
2. The method of claim 1, wherein determining the power generation strategy corresponding to the driving state parameter based on the power generation parameter and the driving state parameter comprises:
determining a compensation parameter corresponding to the degree of smoothness based on the degree of smoothness of the driving state represented by the driving state parameter;
and determining the power generation strategy according to the power generation parameters and the compensation parameters.
3. The method of claim 2, wherein determining the power generation strategy based on the power generation parameter and a compensation parameter comprises:
acquiring the power generation power represented by the power generation parameters;
and taking the product of the generated power and a compensation parameter as the power generation strategy.
4. The method of claim 2, wherein determining a compensation parameter corresponding to the driving state based on the degree of smoothness of the driving state characterized by the driving state parameter comprises:
when the driving state parameter is larger than a preset threshold value, determining the quotient of the driving state parameter and the preset threshold value as the compensation parameter; the preset threshold is the mean value of normal distribution which takes driving state parameters as random variables under standard working conditions;
or
And determining a compensation parameter corresponding to the driving state parameter according to the corresponding relation between the preset stability degree and the preset compensation parameter.
5. The method of claim 4, further comprising:
and when the driving state parameter is not larger than a preset threshold value, determining that the compensation parameter is 1.
6. The method of claim 1, wherein the obtaining the driving state parameter of the driver comprises:
acquiring the speed and the acceleration of the vehicle at the current moment;
and determining the product of the speed and the acceleration as the driving state parameter.
7. The method of claim 1, wherein the obtaining the driving state parameter of the driver comprises:
acquiring the speed and the acceleration of the vehicle at a plurality of moments in a preset time period, and determining driving state parameters corresponding to the moments, wherein the driving state parameter corresponding to each moment is the product of the speed and the acceleration of the vehicle at the moment;
and determining the average value of the driving state parameters corresponding to each moment, and taking the average value as the driving state parameter of the driver.
8. The method of any of claims 1-7, wherein said vehicle state parameters include speed, accelerator opening, and state of charge of said vehicle, and said determining power generation parameters corresponding to said vehicle state parameters comprises:
and determining the power generation parameters corresponding to the vehicle state parameters based on the corresponding relation among the speed, the opening degree of the accelerator pedal, the state of charge and preset power generation parameters.
9. A state of charge maintenance device, comprising:
a state parameter acquiring unit for acquiring a driving state parameter of a driver and a vehicle state parameter of a vehicle, the driving state parameter being used for representing a degree of smoothness of a driving state of the driver;
a power generation parameter determination unit for determining a power generation parameter corresponding to the vehicle state parameter;
and the power generation strategy determining unit is used for determining a power generation strategy corresponding to the driving state parameter according to the power generation parameter and the driving state parameter so as to enable the range extender of the vehicle to generate power according to the power generation strategy.
10. The apparatus of claim 9, wherein the power generation strategy determination unit comprises:
the compensation parameter determining subunit is used for determining a compensation parameter corresponding to the stability degree based on the stability degree of the driving state represented by the driving state parameter;
and the power generation strategy determining subunit is used for determining the power generation strategy according to the power generation parameters and the compensation parameters.
11. The apparatus according to claim 10, wherein the power generation strategy determining subunit is specifically configured to:
acquiring the power generation power represented by the power generation parameters;
and taking the product of the generated power and a compensation parameter as the power generation strategy.
12. The apparatus according to claim 10, wherein the compensation parameter determining subunit is specifically configured to:
when the driving state parameter is larger than a preset threshold value, determining the quotient of the driving state parameter and the preset threshold value as the compensation parameter; the preset threshold is the mean value of normal distribution which takes driving state parameters as random variables under standard working conditions;
or
And determining a compensation parameter corresponding to the driving state parameter according to the corresponding relation between the preset stability degree and the preset compensation parameter.
13. The apparatus according to claim 12, wherein the compensation parameter determining subunit is further configured to:
and when the driving state parameter is not larger than a preset threshold value, determining that the compensation parameter is 1.
14. A vehicle controller having one or more instructions stored thereon that, when executed by the vehicle controller, implement the method of any of claims 1-8.
15. An electric vehicle characterized by comprising the vehicle controller according to claim 14.
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