A method, apparatus, vehicle, and storage medium for protecting a power battery.

Abstract

This invention discloses a method, device, vehicle, and storage medium for protecting a power battery. The method is applied to a vehicle including an engine, generator, power battery, and drive motor. It includes: activating battery protection when the actual power of the power battery is determined to be greater than or equal to a power threshold, and the actual power change rate is greater than or equal to a rate threshold; when the current operating condition is driving acceleration, controlling the generator's speed regulation power to remain constant while reducing the allowable discharge power of the power battery; when the current operating condition is regenerative braking, controlling the generator's speed regulation power to remain constant while reducing the allowable charging power of the power battery. This technical solution, based on the vehicle's current operating condition, enables advance prediction of the power battery's over-discharge and over-charge trends, controls the generator's speed regulation power to remain constant, and simultaneously corrects the allowable discharge and allowable charging power of the power battery, actively reducing the overcharge and over-discharge trends of the power battery, thereby protecting the power battery.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a power battery protection method, device, vehicle, and storage medium. Background Technology

[0002] For hybrid electric vehicles, due to the energy coupling relationship between the generator and the drive motor, during acceleration or regenerative braking, there is a certain time delay in the communication between the vehicle control unit and the generator / drive motor control unit because the generator torque demand or drive motor torque demand signal calculated by the vehicle control unit, as well as the speed signal calculated by the generator and drive motor, do not keep up with the torque demand calculated by the vehicle control unit in a timely manner. This ultimately leads to a certain degree of overcharging and over-discharging of the battery.

[0003] In existing technologies, the allowable power of the battery is mainly corrected through proportional and integral controller (PI control) to achieve overcharge and over-discharge protection. However, this method is a lag control; PI control is only triggered when the actual power of the battery exceeds the allowable power. If the rate of change of the actual power of the battery is large, this lag control can still cause significant overcharging. Summary of the Invention

[0004] This invention provides a power battery protection method, device, vehicle, and storage medium to predict the overcharge and over-discharge trend of the power battery in advance and achieve overcharge and over-discharge protection for the power battery.

[0005] In a first aspect, embodiments of the present invention provide a power battery protection method, applied to a vehicle including an engine, a generator, a power battery, and a drive motor, the method comprising:

[0006] During the process of the generator and the drive motor driving the vehicle, if the actual power of the power battery is greater than or equal to the power threshold and the actual power change rate is greater than or equal to the rate threshold, then the battery protection is activated.

[0007] When the current operating condition is driving acceleration, the speed regulation power of the generator is kept constant, and the allowable discharge power of the power battery is reduced.

[0008] When the current operating condition is regenerative braking, the speed regulation power of the generator is kept constant, and the allowable charging power of the power battery is reduced.

[0009] The technical solution of this invention provides a power battery protection method, applied to a vehicle including an engine, a generator, a power battery, and a drive motor. The method includes: during the process of the generator and the drive motor driving the vehicle, if the actual power of the power battery is greater than or equal to a power threshold and the actual power change rate is greater than or equal to a rate threshold, then battery protection is activated; when the current operating condition is driving acceleration, the speed regulation power of the generator is kept constant, and the allowable discharge power of the power battery is reduced; when the current operating condition is regenerative braking, the speed regulation power of the generator is kept constant, and the allowable charging power of the power battery is reduced. The above technical solution allows for the determination of the actual power and rate of change of the power battery during vehicle operation driven by the generator and drive motor. When the actual power is greater than or equal to a power threshold and the rate of change of the actual power is greater than or equal to a rate threshold, battery protection is activated. This enables over-discharge or overcharge protection of the power battery based on the vehicle's current operating conditions. For example, during acceleration, the generator's speed control power can be kept constant while the allowable discharge power of the power battery is reduced to provide over-discharge protection. During regenerative braking, the generator's speed control power can be kept constant while the allowable charging power of the power battery is reduced to provide overcharge protection. By controlling the actual power change rate of the power battery, the over-discharge and overcharge trends can be predicted and adjusted in advance. While maintaining the generator's speed control power, the allowable discharge and charging power of the power battery are corrected, actively reducing the overcharge and over-discharge trends and thus protecting the power battery.

[0010] Furthermore, before determining that the actual power of the power battery is greater than or equal to a power threshold and that the actual power change rate is greater than or equal to a rate threshold, the method further includes:

[0011] The power threshold value is determined based on the difference between the allowable power of the power battery and a preset value, or based on the allowable power of the power battery and a preset ratio.

[0012] The rate threshold value is determined based on the overcharge and over-discharge capacity and degree of overcharge and over-discharge of the power battery.

[0013] The actual power and the rate of change of the actual power of the power battery are determined based on the voltage and current values ​​of the power battery.

[0014] Furthermore, when the current operating condition is drive acceleration, it also includes:

[0015] The actual power of the generator is determined based on the difference between the actual power of the engine and the speed regulation power of the generator.

[0016] Further, reducing the allowable discharge power of the power battery includes:

[0017] The allowable discharge power offset value is determined based on the actual power change rate of the power battery and preset parameters, or based on the offset value limit value.

[0018] The allowable discharge power of the power battery is reduced based on the offset value of the allowable discharge power of the power battery.

[0019] Furthermore, when the current operating condition is regenerative braking, it also includes:

[0020] The actual power of the generator is determined by the sum of the actual power of the engine and the speed regulation power of the generator.

[0021] Furthermore, reducing the allowable charging power of the power battery includes:

[0022] The allowable charging power offset value is determined based on the actual power change rate of the power battery and preset parameters, or based on the offset value limit value.

[0023] The allowable charging power of the power battery is reduced based on the offset value of the allowable charging power of the power battery.

[0024] Furthermore, the vehicle also includes a drive motor, and the method further includes:

[0025] The rate of change of the drive motor's speed at the current moment is determined based on the first speed of the drive motor received at the current moment and the second speed of the drive motor received a preset time ago.

[0026] The predicted speed of the drive motor at the current moment is determined based on the rate of change of the drive motor's speed at the current moment.

[0027] Secondly, embodiments of the present invention also provide a power battery protection device, configured in a vehicle including an engine, a generator, a power battery, and a drive motor, the device comprising:

[0028] The activation module is used to activate battery protection if, during the process of the generator and the drive motor driving the vehicle, the actual power of the power battery is greater than or equal to a power threshold value and the actual power change rate is greater than or equal to a rate threshold value.

[0029] The first control module is used to control the speed regulation power of the generator to remain constant and reduce the allowable discharge power of the power battery when the current working condition is drive acceleration.

[0030] The second control module is used to control the speed regulation power of the generator to remain unchanged and reduce the allowable charging power of the power battery when the current operating condition is regenerative braking.

[0031] Thirdly, embodiments of the present invention also provide a vehicle, the vehicle comprising:

[0032] One or more processors;

[0033] Storage device for storing one or more programs;

[0034] Engines, generators, power batteries, and drive motors are used to provide driving force for vehicles;

[0035] When the one or more programs are executed by the one or more processors, the one or more processors implement the power battery protection method as described in any of the first aspects.

[0036] Fourthly, embodiments of the present invention also provide a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the power battery protection method as described in any of the first aspects.

[0037] Fifthly, this application provides a computer program product including computer instructions that, when executed on a computer, cause the computer to perform the power battery protection method provided in the first aspect.

[0038] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on a computer-readable storage medium. This computer-readable storage medium may be packaged together with the processor of the power battery protection device, or it may be packaged separately from the processor of the power battery protection device; this application does not impose any limitations on this.

[0039] The descriptions of the second, third, fourth, and fifth aspects in this application can be referred to the detailed description of the first aspect; and the beneficial effects of the descriptions of the second, third, fourth, and fifth aspects can be referred to the analysis of the beneficial effects of the first aspect, which will not be repeated here.

[0040] In this application, the names of the aforementioned power battery protection devices do not limit the devices or functional modules themselves. In actual implementation, these devices or functional modules may appear under other names. As long as the functions of each device or functional module are similar to those in this application, they fall within the scope of the claims of this application and their equivalents.

[0041] These or other aspects of this application will become more readily apparent in the following description. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of the present invention;

[0044] Figure 2 A flowchart of a power battery protection method provided in an embodiment of the present invention;

[0045] Figure 3 A flowchart of another power battery protection method provided in an embodiment of the present invention;

[0046] Figure 4 A power change diagram of the power battery in another power battery protection method provided in an embodiment of the present invention;

[0047] Figure 5 A diagram showing the power changes of the power battery, drive motor, engine, and generator during acceleration in another power battery protection method provided in an embodiment of the present invention.

[0048] Figure 6 A diagram showing the power changes of the power battery, drive motor, engine, and generator during regenerative braking in another power battery protection method provided in an embodiment of the present invention.

[0049] Figure 7 A graph showing the speed variation of the drive motor in another power battery protection method provided in an embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the structure of a power battery protection device provided in an embodiment of the present invention;

[0051] Figure 9 This is a structural schematic diagram of a vehicle provided in an embodiment of the present invention. Detailed Implementation

[0052] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0053] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0054] The terms "first" and "second," etc., used in the specification and drawings of this application are used to distinguish different objects or to distinguish different treatments of the same object, rather than to describe a specific order of objects.

[0055] Furthermore, the terms "comprising" and "having," and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0056] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the figures. The process can correspond to a method, function, procedure, subroutine, subroutine, etc. Moreover, embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0057] It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0058] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0059] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of the present invention, such as... Figure 1As shown, the vehicle includes an engine 110, a generator 120, a power battery 130, and a drive motor 140, as well as a clutch 150 and a coupler 160. The engine 110, generator 120, power battery 130, and drive motor 140 cooperate with each other to provide driving force to the vehicle based on the clutch 150 and coupler 160, so as to drive the wheels to accelerate, decelerate, or travel at a constant speed.

[0060] Figure 2 This is a flowchart of a power battery protection method provided in an embodiment of the present invention. This embodiment is applicable to situations where it is necessary to predict the overcharge and over-discharge trends of the power battery in advance to reduce the risk of overcharge and over-discharge. This method can be executed by a power battery protection device and is applied to situations such as... Figure 1 The vehicles shown, such as Figure 2 As shown, the specific steps include the following:

[0061] Step 210: During the process of the generator and the drive motor driving the vehicle, if the actual power of the power battery is greater than or equal to the power threshold and the actual power change rate is greater than or equal to the rate threshold, then the battery protection is activated.

[0062] Before a vehicle leaves the factory or is used, a preset difference or preset ratio can be determined based on the default allowable power of the power battery, and a power threshold can be determined based on the default allowable power of the power battery and the preset difference, or based on the default allowable power of the power battery and the preset ratio. A rate threshold can also be determined based on the overcharge and over-discharge capabilities and the degree of overcharge and over-discharge of the power battery.

[0063] During the process of the generator and drive motor driving the vehicle, the actual power of the power battery and the actual power change rate can be determined based on the current value and voltage value of the power battery.

[0064] By comparing the actual power of the power battery with the power threshold value, and comparing the actual power change rate of the power battery with the rate threshold value, the protection of the power battery can be activated when it is determined that the actual power of the power battery is greater than or equal to the power threshold value and the actual power change rate is greater than or equal to the rate threshold value.

[0065] In practical applications, power exit threshold and rate exit threshold can also be determined. When the actual power of the power battery is determined to be less than the power threshold or the actual power change rate is less than the rate threshold, the protection of the power battery is turned off.

[0066] In this embodiment of the invention, during the process of the generator and drive motor driving the vehicle, the power battery protection can be activated based on the actual power and actual power change rate of the power battery, as well as the power threshold and rate threshold determined based on the default allowable power of the power battery, thereby achieving predictive regulation of the power battery.

[0067] Step 220: When the current operating condition is driving acceleration, control the speed regulation power of the generator to remain unchanged and reduce the allowable discharge power of the power battery.

[0068] Specifically, in the current driving acceleration condition, the engine and the power battery work together to accelerate the vehicle. To mitigate the limitation of the drive motor's driving capability caused by the generator's speed regulation, and to reduce the over-discharge tendency of the power battery, the generator's speed regulation power can be controlled to maintain its current value and not continue to increase. This also prevents torque fluctuations caused by the limited torque capability of the drive motor. Additionally, the allowable discharge power of the power battery can be reduced.

[0069] In this embodiment of the invention, when the vehicle is accelerating, over-discharge protection of the power battery is achieved by controlling the speed regulation power of the generator to remain constant and reducing the allowable discharge power of the power battery.

[0070] Step 230: When the current operating condition is regenerative braking, control the speed regulation power of the generator to remain unchanged and reduce the allowable charging power of the power battery.

[0071] Specifically, under the current operating condition of regenerative braking, the engine can charge the battery via the generator. To mitigate the overcharging tendency of the battery caused by generator speed regulation, the generator's speed regulation power can be controlled to maintain its current value and not continue to increase. Alternatively, the allowable charging power of the battery can be reduced.

[0072] In this embodiment of the invention, when the vehicle is regenerative braking, overcharge protection of the power battery is achieved by controlling the speed regulation power of the generator to remain constant and reducing the allowable charging power of the power battery.

[0073] This invention provides a power battery protection method applied to a vehicle including an engine, a generator, a power battery, and a drive motor. The method includes: during the process of the generator and the drive motor driving the vehicle, if the actual power of the power battery is greater than or equal to a power threshold and the actual power change rate is greater than or equal to a rate threshold, then battery protection is activated; when the current operating condition is driving acceleration, the speed regulation power of the generator is kept constant, and the allowable discharge power of the power battery is reduced; when the current operating condition is regenerative braking, the speed regulation power of the generator is kept constant, and the allowable charging power of the power battery is reduced. The above technical solution allows for the determination of the actual power and rate of change of the power battery during vehicle operation driven by the generator and drive motor. When the actual power is greater than or equal to a power threshold and the rate of change of the actual power is greater than or equal to a rate threshold, battery protection is activated. This enables over-discharge or overcharge protection of the power battery based on the vehicle's current operating conditions. For example, during acceleration, the generator's speed control power can be kept constant while the allowable discharge power of the power battery is reduced to provide over-discharge protection. During regenerative braking, the generator's speed control power can be kept constant while the allowable charging power of the power battery is reduced to provide overcharge protection. By controlling the actual power change rate of the power battery, the over-discharge and overcharge trends can be predicted and adjusted in advance. While maintaining the generator's speed control power, the allowable discharge and charging power of the power battery are corrected, actively reducing the overcharge and over-discharge trends and thus protecting the power battery.

[0074] Figure 3 This is a flowchart illustrating another power battery protection method provided in an embodiment of the present invention. This embodiment is a specific modification based on the above embodiments. Figure 3 As shown, in this embodiment, the method may further include:

[0075] Step 310: Determine the power threshold and rate threshold of the power battery.

[0076] In one implementation, step 310 may specifically include:

[0077] The power threshold is determined based on the difference between the allowable power of the power battery and a preset value, or based on the allowable power of the power battery and a preset ratio; the rate threshold is determined based on the overcharge and over-discharge capacity and the degree of overcharge and over-discharge of the power battery.

[0078] Specifically, before the vehicle leaves the factory or before it is used, a preset difference ΔP1 or a preset ratio μ can be determined based on the default allowable power P of the power battery, thereby determining the power threshold value P. a=max[P-ΔP1,P×μ]. Therefore, it can be concluded that when the default allowable power P of the power battery is relatively large, the power threshold value P can be determined. a =P-ΔP1, when the default allowable power P of the power battery is relatively small, the power threshold value P can be determined. a =P×μ. The rate threshold δP can also be determined based on the overcharge and over-discharge capacity of the power battery and the actual degree of overcharge and over-discharge. act1 When the overcharge and over-discharge capacity of the power battery is small or the actual overcharge and over-discharge degree is large, a small rate threshold value δP is determined. act1 .

[0079] In practical applications, a power exit threshold P can also be set. b and rate exit threshold δP act2 Power exit threshold P b and rate exit threshold δP act2 Used to deactivate battery protection when the actual power of the power battery is determined to be less than the power exit threshold, or the actual power change rate is less than the rate exit threshold.

[0080] In this embodiment of the invention, the power threshold, power exit threshold, speed threshold, and speed exit threshold of the vehicle are calibrated, providing a data basis for determining whether battery protection should be performed.

[0081] Step 320: During the process of the generator and the drive motor driving the vehicle, determine the actual power of the power battery and the actual power change rate.

[0082] In one implementation, step 320 may specifically include:

[0083] During the process of the vehicle being driven by the generator and the drive motor, the actual power and the actual power change rate of the power battery are determined based on the voltage and current values ​​of the power battery.

[0084] Specifically, during the process of the generator and drive motor driving the vehicle, the voltage value of the power battery can be obtained based on a voltage sensor, and the current value of the power battery can be obtained based on a current sensor. Then, based on the current and voltage values ​​of the power battery within a preset time period, the actual power of the power battery and the actual rate of change of that power can be determined.

[0085] Step 330: When it is determined that the actual power of the power battery is greater than or equal to the power threshold and the actual power change rate is greater than or equal to the rate threshold, the battery protection is activated.

[0086] Specifically, the actual power of the power battery is compared with the power threshold value, and the actual power change rate of the power battery is compared with the rate threshold value. When it is determined that the actual power of the power battery is greater than or equal to the power threshold value, and the actual power change rate is greater than or equal to the rate threshold value, the protection of the power battery can be activated.

[0087] Of course, when it is determined that the actual power of the power battery is less than the power threshold, or the actual power change rate is less than the rate threshold, the protection of the power battery can be turned off.

[0088] Figure 4 The power change diagram of the power battery in another power battery protection method provided in this embodiment of the invention is shown below. Figure 4 As shown, the actual power of the power battery is determined to be greater than or equal to the power threshold value P. a And the actual power change rate is greater than or equal to the rate threshold δP act1 At this time, activate overcharge / overdischarge regulation; ensure the actual power of the power battery is less than the power exit threshold P. b Or the actual rate of power change is less than the rate exit threshold δP act2 When this happens, turn off overcharge / over-discharge regulation.

[0089] In this embodiment of the invention, during the process of the generator and drive motor driving the vehicle, the protection of the power battery can be determined based on the actual power of the power battery, the power threshold, the power exit threshold, the actual power change rate, the rate threshold, and the rate exit threshold, thereby realizing predictive regulation of the power battery.

[0090] Step 340: When the current operating condition is driving acceleration, control the speed regulation power of the generator to remain unchanged and reduce the allowable discharge power of the power battery.

[0091] Specifically, under the current operating condition of acceleration, where the engine and the power battery work together to drive the vehicle, the generator's power P can be determined. GM =-(P EngAct -P adj ), where P EngAct P represents the actual power of the engine. adj This refers to the generator's speed-regulating power. When the vehicle accelerates, it's necessary to control the generator's speed-regulating power P. adj Keep the current P adj0 Without further increasing, the generator's power P is determined. GM =-(P EngAct -P adj0 This can alleviate the phenomenon of limited drive motor driving capability caused by generator speed regulation, while also mitigating the over-discharge trend of the power battery and preventing torque fluctuations caused by limited drive motor torque capability.

[0092] Additionally, the allowable discharge power of the power battery can be reduced. Specifically, the over-discharge offset value ΔP can be reduced. 偏移1 For example, it can be based on the actual power change rate δP of the power battery. act And adjust the parameter γ, or it can be based on the anti-over-discharge offset value ΔP. 偏移1 Limit value ΔP lim1 Determine the over-discharge protection offset value ΔP 偏移1 The parameter γ can be calibrated based on the magnitude of the over-discharge trend of the power battery and the over-discharge capacity reserve of the power battery itself. Of course, the over-discharge offset value ΔP needs to be determined. 偏移1 Afterwards, the over-discharge protection offset value ΔP needs to be adjusted. 偏移1 Perform Ramp processing to obtain ΔP 偏移ramp1 This is to prevent sudden changes in the allowable discharge power P1 of the power battery. Therefore, it can be determined that the target allowable discharge power P'1 obtained by reducing the allowable discharge power of the power battery is P1 - ΔP. 偏移ramp1 .

[0093] Figure 5 The diagram showing the power changes of the power battery, drive motor, engine, and generator during acceleration in another power battery protection method provided in this embodiment of the invention is shown below. Figure 5 As shown, after overcharge / discharge regulation is enabled, the speed regulation power of the generator remains unchanged, the target allowable discharge power of the power battery decreases, and the actual power of the power battery is also less than the allowable discharge power of the battery, thus achieving discharge protection for the power battery.

[0094] In this embodiment of the invention, when the vehicle is accelerating, over-discharge protection of the power battery is achieved by controlling the speed regulation power of the generator to remain constant and reducing the allowable discharge power of the power battery.

[0095] Step 350: When the current operating condition is regenerative braking, control the speed regulation power of the generator to remain unchanged and reduce the allowable charging power of the power battery.

[0096] Specifically, under the current operating condition of regenerative braking, the engine can charge the battery using the generator. The generator's power output P can be determined. GM =-(P EngAct +P adj ), where P EngAct P represents the actual power of the engine. adj This refers to the generator's speed control power. Similarly, during vehicle regenerative braking, it's necessary to control the generator's speed control power P. adj Keep the current P adj0 Without further increasing, the generator's power P is determined. GM =-(PEngAct -P adj0 This can mitigate the overcharging trend of the power battery caused by generator speed regulation.

[0097] It should be noted that when the vehicle brakes and the drive motor torque decreases from positive to zero, if the power battery still has the ability to regenerate while the generator is adjusting its speed, then the drive motor's regeneration torque requirement takes precedence over the generator's speed adjustment requirement. If the power battery does not have the ability to regenerate while the generator is adjusting its speed, then the generator's speed adjustment requirement takes precedence over the drive motor's regeneration torque requirement.

[0098] Additionally, the allowable charging power of the power battery can be reduced. Similarly, the over-discharge offset value ΔP can be reduced. 偏移2 For example, it can be based on the actual rate of change of battery power δP act And adjust the parameter γ, or you can adjust it according to the overcharge protection offset value ΔP. 偏移2 Limit value ΔP lim2 Determine the overcharge protection offset value ΔP 偏移2 The parameter γ can be calibrated based on the magnitude of the over-discharge trend of the power battery and the over-discharge capacity reserve of the power battery itself. Similarly, the overcharge protection offset value ΔP is determined. 偏移2 Afterwards, the overcharge protection offset value ΔP needs to be adjusted. 偏移2 Perform Ramp processing to obtain ΔP 偏移ramp2 This is to prevent sudden changes in the allowable charging power P2 of the power battery. Therefore, it can be determined that the target allowable charging power P'2 obtained by reducing the allowable charging power of the power battery is P2 - ΔP. 偏移ramp2 .

[0099] Figure 6 A power change diagram of the power battery, drive motor, engine, and generator during regenerative braking in another power battery protection method provided in this embodiment of the invention is shown below. Figure 6 As shown, after overcharge / discharge regulation is enabled, the generator's speed regulation power remains unchanged, the target allowable charging power of the power battery decreases, and the actual power of the power battery is also less than the allowable charging power, thus achieving charging protection for the power battery.

[0100] In this embodiment of the invention, when the vehicle is regenerative braking, overcharge protection of the power battery is achieved by controlling the speed regulation power of the generator to remain constant and reducing the allowable charging power of the power battery.

[0101] Step 360: Determine the rate of change of the drive motor's speed at the current moment based on the first speed of the drive motor received at the current moment and the second speed of the drive motor received a preset time ago.

[0102] Figure 7 The rotational speed change diagram of the drive motor in another power battery protection method provided by an embodiment of the present invention is as follows. Figure 7 As shown, due to the communication delay between the drive motor control unit and the vehicle control unit, the rotational speed N of the drive motor at the current moment real and the rotational speed N of the drive motor received by the vehicle control unit at the current moment read have a delay of M cycles, that is, N read is the N from M cycles ago real . Since the delay of N read causes the calculated result of the drive motor torque capacity T TMlin to be too large, there is a risk of over-discharge of the power battery.

[0103] Specifically, the first rotational speed of the drive motor received by the vehicle control unit at the current moment is N read , and the second rotational speed of the drive motor received L cycles ago is N real-L . Due to the communication delay, the second rotational speed N real-L is the rotational speed of the drive motor (M + L) cycles ago. Therefore, the rotational speed change rate δN read of the drive motor M moments ago can be determined as δN read =(N real-L -N real-L ) / L.

[0104] Step 370: Determine the rotational speed prediction value of the drive motor at the current moment according to the rotational speed change rate of the drive motor at the current moment.

[0105] Specifically, after determining the rotational speed N real-L of the drive motor (M + L) cycles ago, the rotational speed prediction value N realpred of the drive motor at the current moment can be determined. Specifically, when δN read >0, it can be determined that N realpred =N read +δN read ×r, where r < M; when δN read <0, it can be determined that N realpred =N read . And when the sign of δN read changes, ramp processing needs to be performed on N realpred .

[0106] When the current working condition is braking recovery, driving hold or driving deceleration, the rotational speed prediction value N realpred of the drive motor calculated by the vehicle control unit at the current moment is relatively close to the rotational speed N real of the drive motor at the current moment.When the current operating condition is acceleration, the predicted speed of the drive motor calculated by the vehicle control unit at the current moment is greater than or equal to the current speed N of the drive motor. real The drive motor torque capability T calculated by the vehicle control unit. TMlin =Min[P TMlin / N read ,T'], where P TMlin T represents the power capability of the drive motor, and T' represents the external characteristic of T. Therefore, the torque capability T of the drive motor calculated by the vehicle control unit... TMlin The smaller size reduces the risk of overcharging or over-discharging the battery. It should be noted that the drive motor torque capacity T calculated by the vehicle control unit... TMlin The degree of smallness should not affect the overall drivability of the vehicle.

[0107] The power battery protection method provided in this invention is applied to a vehicle including an engine, a generator, a power battery, and a drive motor. The method includes: determining a power threshold and a rate threshold for the power battery; determining the actual power and actual power change rate of the power battery during the process of the generator and the drive motor driving the vehicle; activating battery protection when the actual power of the power battery is greater than or equal to the power threshold and the actual power change rate is greater than or equal to the rate threshold; controlling the speed regulation power of the generator to remain constant and reducing the allowable discharge power of the power battery when the current operating condition is driving acceleration; controlling the speed regulation power of the generator to remain constant and reducing the allowable charging power of the power battery when the current operating condition is regenerative braking; determining the speed change rate of the drive motor at the current moment based on a first speed of the drive motor received at the current moment and a second speed of the drive motor received a preset time ago; and determining a predicted speed value of the drive motor at the current moment based on the speed change rate of the drive motor at the current moment. The above technical solution allows for the determination of the actual power and rate of change of the power battery during vehicle operation driven by the generator and drive motor. When the actual power is greater than or equal to a power threshold and the rate of change of the actual power is greater than or equal to a rate threshold, battery protection is activated. This enables over-discharge or overcharge protection of the power battery based on the vehicle's current operating conditions. For example, during acceleration, the generator's speed control power can be kept constant while the allowable discharge power of the power battery is reduced to provide over-discharge protection. During regenerative braking, the generator's speed control power can be kept constant while the allowable charging power of the power battery is reduced to provide overcharge protection. By controlling the actual power change rate of the power battery, the over-discharge and overcharge trends can be predicted and adjusted in advance. While maintaining the generator's speed control power, the allowable discharge and charging power of the power battery are corrected, actively reducing the overcharge and over-discharge trends and thus protecting the power battery. Of course, the predicted speed of the drive motor at the current moment can also be determined after determining the rate of change of the drive motor's speed at the current moment. When the drive motor runs based on this predicted speed, the power battery will be less likely to be overcharged or over-discharged.

[0108] Figure 8 This is a schematic diagram of a power battery protection device provided in an embodiment of the present invention. This device is applicable to situations where it is necessary to predict the overcharge and over-discharge trends of the power battery in advance to reduce the risk of overcharge and over-discharge. The device is configured in a vehicle including an engine, generator, power battery, and drive motor, and can be implemented through software and / or hardware, and is generally integrated into the vehicle including the engine and power battery.

[0109] like Figure 8 As shown, the device includes:

[0110] The activation module 810 is used to activate battery protection if, during the process of the generator and the drive motor driving the vehicle, the actual power of the power battery is greater than or equal to a power threshold value and the actual power change rate is greater than or equal to a rate threshold value.

[0111] The first control module 820 is used to control the speed regulation power of the generator to remain unchanged and reduce the allowable discharge power of the power battery when the current working condition is drive acceleration.

[0112] The second control module 830 is used to control the speed regulation power of the generator to remain unchanged and reduce the allowable charging power of the power battery when the current operating condition is regenerative braking.

[0113] The power battery protection device provided in this embodiment is configured in a vehicle including an engine, a generator, a power battery, and a drive motor. It includes: during the process of the generator and the drive motor driving the vehicle, if the actual power of the power battery is greater than or equal to a power threshold and the actual power change rate is greater than or equal to a rate threshold, then battery protection is activated; when the current operating condition is driving acceleration, the speed regulation power of the generator is kept constant, and the allowable discharge power of the power battery is reduced; when the current operating condition is regenerative braking, the speed regulation power of the generator is kept constant, and the allowable charging power of the power battery is reduced. The above technical solution allows for the determination of the actual power and rate of change of the power battery during vehicle operation driven by the generator and drive motor. When the actual power is greater than or equal to a power threshold and the rate of change of the actual power is greater than or equal to a rate threshold, battery protection is activated. This enables over-discharge or overcharge protection of the power battery based on the vehicle's current operating conditions. For example, during acceleration, the generator's speed control power can be kept constant while the allowable discharge power of the power battery is reduced to provide over-discharge protection. During regenerative braking, the generator's speed control power can be kept constant while the allowable charging power of the power battery is reduced to provide overcharge protection. By controlling the actual power change rate of the power battery, the over-discharge and overcharge trends can be predicted and adjusted in advance. While maintaining the generator's speed control power, the allowable discharge and charging power of the power battery are corrected, actively reducing the overcharge and over-discharge trends and thus protecting the power battery.

[0114] Based on the above embodiments, the device further includes:

[0115] The first determining module is used to determine the power threshold value based on the allowable power of the power battery and a preset difference, or based on the allowable power of the power battery and a preset ratio.

[0116] The second determining module is used to determine the rate threshold value based on the overcharge and over-discharge capacity and the degree of overcharge and over-discharge of the power battery.

[0117] The third determining module is used to determine the actual power and actual power change rate of the power battery based on the voltage and current values ​​of the power battery.

[0118] Based on the above embodiments, the first control module 820 is specifically used for:

[0119] When the current operating condition is driving acceleration, the speed regulation power of the generator is kept constant. The actual power of the generator is determined based on the difference between the actual power of the engine and the speed regulation power of the generator.

[0120] The allowable discharge power offset value is determined based on the actual power change rate of the power battery and preset parameters, or based on the offset value limit value.

[0121] The allowable discharge power of the power battery is reduced based on the offset value of the allowable discharge power of the power battery.

[0122] Based on the above embodiments, the second control module 830 is specifically used for:

[0123] When the current operating condition is regenerative braking, the speed regulation power of the generator is kept constant. The actual power of the generator is determined based on the sum of the actual power of the engine and the speed regulation power of the generator.

[0124] The allowable charging power offset value is determined based on the actual power change rate of the power battery and preset parameters, or based on the offset value limit value.

[0125] The allowable charging power of the power battery is reduced based on the offset value of the allowable charging power of the power battery.

[0126] Based on the above embodiments, the device further includes:

[0127] The prediction module is used to determine the rate of change of the drive motor's speed at the current moment based on the first speed of the drive motor received at the current moment and the second speed of the drive motor received a preset time ago; and to determine the predicted speed value of the drive motor at the current moment based on the rate of change of the drive motor's speed at the current moment.

[0128] The power battery protection device provided in the embodiments of the present invention can execute the power battery protection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the method.

[0129] It is worth noting that in the embodiments of the above-mentioned power battery protection device, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0130] Figure 9 This is a schematic diagram of the structure of a vehicle provided in an embodiment of the present invention, such as... Figure 9 As shown, the vehicle control system includes an engine 110, a generator 120, a power battery 130, a drive motor 140, a clutch 150, a coupler 160, a controller 170, and a memory 180; the number of controllers 170 in the vehicle can be one or more. Figure 9 Taking a controller 170 as an example; the engine 110, generator 120, power battery 130, drive motor 140, clutch 150, coupler 160, controller 170 and memory 180 in the vehicle can be connected via bus or other means. Figure 9 Taking the example of a connection between China and Israel via a bus.

[0131] The memory 180, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the vehicle control method in this embodiment of the invention (e.g., the opening module 810, the first control module 820, and the second control module 830 in the power battery protection device). The controller 170 executes various vehicle functions and data processing by running the software programs, instructions, and modules stored in the memory 180, thereby realizing the aforementioned vehicle control method.

[0132] The memory 180 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on terminal usage. Furthermore, the memory 180 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 180 may further include memory remotely configured relative to the controller 170, which can be connected to the vehicle via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0133] The engine 110, generator 120, power battery 130, and drive motor 140 are used to provide driving force for the vehicle.

[0134] Of course, those skilled in the art will understand that the controller can implement the technical solution of the vehicle control method provided in any embodiment of the present invention.

[0135] The vehicle provided in this embodiment of the invention can execute the vehicle control method provided in the above embodiments, and has corresponding functions and beneficial effects.

[0136] This invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements, for example, the power battery protection method provided in this invention. This method is applied to a vehicle including an engine, a generator, a power battery, and a drive motor, and includes:

[0137] During the process of the generator and the drive motor driving the vehicle, if the actual power of the power battery is greater than or equal to the power threshold and the actual power change rate is greater than or equal to the rate threshold, then the battery protection is activated.

[0138] When the current operating condition is driving acceleration, the speed regulation power of the generator is kept constant, and the allowable discharge power of the power battery is reduced.

[0139] When the current operating condition is regenerative braking, the speed regulation power of the generator is kept constant, and the allowable charging power of the power battery is reduced.

[0140] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. For example, a computer-readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0141] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0142] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0143] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0144] Those skilled in the art will understand that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computing device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0145] Furthermore, the acquisition, storage, use, and processing of data in the technical solution of this invention all comply with the relevant provisions of national laws and regulations.

[0146] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for protecting a power battery, characterized in that, Applied to vehicles including engines, generators, power batteries, and drive motors, the method includes: During the process of the generator and the drive motor driving the vehicle, if the actual power of the power battery is greater than or equal to the power threshold and the actual power change rate is greater than or equal to the rate threshold, then the battery protection is activated. When the current operating condition is driving acceleration, the speed regulation power of the generator is kept constant, and the allowable discharge power of the power battery is reduced. When the current operating condition is regenerative braking, the speed regulation power of the generator is kept constant, and the allowable charging power of the power battery is reduced. The rate of change of the drive motor's speed at the current moment is determined based on the first speed of the drive motor received at the current moment and the second speed of the drive motor received a preset time ago. When the rate of change of the drive motor's speed at the current moment is greater than zero, the predicted speed N of the drive motor at the current moment is determined. realpred =N read +δN read ×r, when the rate of change of the drive motor's speed at the current moment is less than zero, determine the predicted speed N of the drive motor at the current moment. realpred =N read , where N realpred N represents the predicted rotational speed of the drive motor at the current moment. read This represents the first rotational speed of the drive motor at the current moment, where r is a natural number less than M, and M represents the receiving time of the second rotational speed of the drive motor used to calculate the rate of change of the rotational speed of the drive motor at the current moment. The drive motor is controlled to operate based on the predicted speed value.

2. The power battery protection method according to claim 1, characterized in that, Before determining that the actual power of the power battery is greater than or equal to a power threshold and that the actual power change rate is greater than or equal to a rate threshold, the method further includes: The power threshold value is determined based on the difference between the allowable power of the power battery and a preset value, or based on the allowable power of the power battery and a preset ratio. The rate threshold value is determined based on the overcharge and over-discharge capacity and degree of overcharge and over-discharge of the power battery. The actual power and the rate of change of the actual power of the power battery are determined based on the voltage and current values ​​of the power battery.

3. The power battery protection method according to claim 1, characterized in that, When the current operating condition is drive acceleration, it also includes: The actual power of the generator is determined based on the difference between the actual power of the engine and the speed regulation power of the generator.

4. The power battery protection method according to claim 1, characterized in that, Reducing the allowable discharge power of the power battery includes: The allowable discharge power offset value is determined based on the actual power change rate of the power battery and preset parameters, or based on the offset value limit value. The allowable discharge power of the power battery is reduced based on the offset value of the allowable discharge power of the power battery.

5. The power battery protection method according to claim 1, characterized in that, When the current operating condition is regenerative braking, it also includes: The actual power of the generator is determined by the sum of the actual power of the engine and the speed regulation power of the generator.

6. The power battery protection method according to claim 1, characterized in that, Reducing the allowable charging power of the power battery includes: The allowable charging power offset value is determined based on the actual power change rate of the power battery and preset parameters, or based on the offset value limit value. The allowable charging power of the power battery is reduced based on the offset value of the allowable charging power of the power battery.

7. A power battery protection device, characterized in that, The device, configured in a vehicle including an engine, a generator, a power battery, and a drive motor, comprises: The activation module is used to activate battery protection when it is determined that the actual power of the power battery is greater than or equal to a power threshold value and the actual power change rate is greater than or equal to a rate threshold value. The first control module is used to control the speed regulation power of the generator to remain constant and reduce the allowable discharge power of the power battery when the current working condition is drive acceleration. The second control module is used to maintain the speed regulation power of the generator at a constant level and reduce the allowable charging power of the power battery when the current operating condition is regenerative braking; it is also used to determine the speed change rate of the drive motor at the current moment based on the first speed of the drive motor received at the current moment and the second speed of the drive motor received a preset time ago; when the speed change rate of the drive motor at the current moment is greater than zero, it determines the predicted speed value N of the drive motor at the current moment. realpred =N read +δN read ×r, when the rate of change of the drive motor's speed at the current moment is less than zero, determine the predicted speed N of the drive motor at the current moment. realpred =N read , where N realpred N represents the predicted rotational speed of the drive motor at the current moment. read The first rotational speed of the drive motor at the current moment is represented by r, which is a natural number less than M, and M represents the receiving time of the second rotational speed of the drive motor used to calculate the rate of change of the rotational speed of the drive motor at the current moment; the drive motor is controlled to operate based on the predicted rotational speed value.

8. A vehicle, characterized in that, The vehicles include: One or more processors; Storage device for storing one or more programs; Engines, generators, power batteries, and drive motors are used to provide driving force for vehicles; When the one or more programs are executed by the one or more processors, the one or more processors implement the power battery protection method as described in any one of claims 1-6.

9. A storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the power battery protection method as described in any one of claims 1-6.

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