A method, device and controller for determining charging request of a power battery

Abstract

The embodiment of the present invention discloses a method, device and controller for determining a charging request of a power battery. The method for determining a charging request of a power battery includes: determining a charging setting condition according to the state of charge of the power battery, a start threshold, a stop threshold, a start request and the engine state; determining a charging reset condition according to the state of charge of the power battery, the stop threshold and the working condition of the vehicle; outputting a charging stop request when both the charging setting condition and the charging reset condition are satisfied; outputting a charging start request when the charging reset condition is not satisfied and the charging setting condition is satisfied; wherein, the charging stop request is output by default. The embodiment of the present invention determines the charging setting condition and the charging reset condition by collecting various parameters, so that the charging setting condition and the charging reset condition change according to the real-time state of the vehicle. Problems such as frequent starting and stopping of the engine are avoided. The fuel economy of the engine is improved, and the driving experience of the driver is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to power battery control technology, and more particularly to a method, device, and controller for determining a charging request of a power battery. Background Art

[0002] As people's awareness of environmental protection increases, hybrid vehicles, as a type of vehicle that combines the advantages of both fuel vehicles and electric vehicles, have been widely praised by the market.

[0003] However, existing hybrid vehicles often send a charging request to the engine when charging is needed. The engine provides power to the generator, which converts the power into electricity and charges the battery. The engine also has the task of outputting power. This simultaneous task of outputting power and driving the generator results in frequent engine starts and stops, as well as restarts shortly after stopping. These issues impact both engine fuel economy and the driver's experience. Summary of the Invention

[0004] The present invention provides a method, a device and a controller for determining a charging request of a power battery, which are used to improve the fuel economy of an engine and enhance the driving experience of a driver.

[0005] In a first aspect, an embodiment of the present invention provides a method for determining a charging request of a power battery, comprising:

[0006] Determine the charging setting conditions based on the power battery's state of charge, start threshold, stop threshold, start request, and engine status;

[0007] Determining a charging reset condition according to the state of charge of the power battery, the shutdown threshold and the operating condition of the vehicle;

[0008] When the charging setting condition and the charging reset condition are simultaneously met, outputting a charging stop request;

[0009] When the charging reset condition is not met and the charging setting condition is met, outputting a charging start request;

[0010] The charging stop request is output by default.

[0011] Optionally, the charging reset condition is that the state of charge of the power battery is greater than the shutdown threshold, or the vehicle is in a coasting energy recovery condition or a braking energy recovery condition.

[0012] Optionally, the charging setting condition is that the state of charge of the power battery is less than the start threshold, or the state of charge of the power battery is less than the stop threshold and other start requests other than the charging start request are valid and the engine is in the running state.

[0013] Optionally, the sum of the start threshold and the offset threshold is the shutdown threshold, the offset threshold includes a basic offset and an extended offset, and the extended offset is the maximum value of a static offset and a dynamic offset.

[0014] Optionally, the method for determining the static offset includes:

[0015] determining whether the vehicle is in a first operating condition;

[0016] If the first operating condition is satisfied, calculating a minimum start interval under the first operating condition, where the minimum start interval is a minimum value greater than or equal to a start time interval threshold;

[0017] Calculating the number of starts and stops corresponding to the minimum start interval during the first operating period;

[0018] The product of the number of starts and stops and the single expansion amount is determined as a reference static offset;

[0019] Selecting a minimum value between the reference static offset and the extended maximum offset as the static offset;

[0020] Among them, the first operating condition is that after the high-voltage power-up is completed, the gear position of the vehicle is in the parking gear, neutral gear or forward automatic shift gear, and the speed of the vehicle is less than the sum of the vehicle's target creeping speed and the speed offset, and the throttle opening is less than the preset throttle threshold; the extended maximum offset is the preset charge state of the power battery.

[0021] Optionally, if the first operating condition is not met, the static offset is zero.

[0022] Optionally, the method for determining the dynamic offset includes:

[0023] determining whether the vehicle is in a second operating condition;

[0024] If the second operating condition is met, the vehicle speed is obtained, and the dynamic offset is determined according to a vehicle speed-dynamic offset correspondence table, where when the vehicle speed is lower than a speed threshold, the dynamic offset increases as the vehicle speed increases, and when the vehicle speed is higher than the speed threshold, the dynamic offset decreases as the vehicle speed increases;

[0025] Among them, the second operating condition is that the gear position of the vehicle is in the forward automatic shift gear position, and the vehicle meets the preset speed and throttle conditions; the preset speed and throttle conditions are that the speed of the vehicle is greater than the sum of the preset speed threshold and the speed extension amount, or the throttle of the vehicle is greater than the sum of the preset throttle threshold and the throttle extension amount.

[0026] Optionally, if the second operating condition is not met, the dynamic offset is zero.

[0027] In a second aspect, an embodiment of the present invention further provides a device for determining a charging request of a power battery, comprising:

[0028] a charging setting condition determination module, the charging setting condition determination module being configured to determine the charging setting condition based on the state of charge of the power battery, the start threshold, the stop threshold, the start request, and the engine state;

[0029] a charging reset condition determination module, configured to determine a charging reset condition based on the state of charge of the power battery, the shutdown threshold, and the operating condition of the vehicle;

[0030] a charging stop request output module, configured to output a charging stop request when both the charging set condition and the charging reset condition are satisfied;

[0031] a charging start request output module, configured to output a charging start request when the charging reset condition is not met but the charging set condition is met;

[0032] The charging stop request is output by default.

[0033] In a third aspect, an embodiment of the present invention further provides a controller comprising the above-mentioned device for determining a charging request of a power battery.

[0034] The method for determining a charging request for a power battery provided in an embodiment of the present invention includes determining a charging setting condition based on the state of charge of the power battery, a start threshold, a stop threshold, a start request, and the engine state. A charging reset condition is determined based on the state of charge of the power battery, the stop threshold, and the operating condition of the vehicle. When the charging setting condition and the charging reset condition are simultaneously satisfied, a charging stop request is output. When the charging reset condition is not satisfied but the charging setting condition is satisfied, a charging start request is output. The charging stop request is output by default. The charging setting condition and the charging reset condition are determined by collecting various parameters, so that the charging setting condition and the charging reset condition continuously change according to changes in the various parameters. This achieves the purpose of adjusting the engine start and stop conditions according to the real-time state of the vehicle. This avoids problems such as frequent engine starts and stops, and restarting the engine within a short period of time after stopping. This improves the fuel economy of the engine and enhances the driving experience of the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic structural diagram of a dual-motor hybrid power system for a vehicle provided by an embodiment of the present invention;

[0036] Figure 2 A flow chart of a method for determining a charging request for a power battery provided by an embodiment of the present invention;

[0037] Figure 3 A flow chart of a method for determining a static offset provided by an embodiment of the present invention;

[0038] Figure 4 A flow chart of a method for determining a dynamic offset provided by an embodiment of the present invention;

[0039] Figure 5 A schematic structural diagram of a device for determining a charging request for a power battery provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0041] Figure 1 A schematic diagram of a dual-motor hybrid system for a vehicle according to an embodiment of the present invention is provided. Figure 1 In the prior art, hybrid vehicles can adopt a dual-motor hybrid system structure, which includes an engine 1, a generator 2, a torsional vibration damper 3, a reduction gear mechanism 4, a clutch 5, a drive motor 6, and a differential 7. The engine 1 drives the generator 2 to generate electricity. The engine 1 is used to both drive the vehicle and drive the generator 2 to generate electricity. Therefore, the starting and stopping of the engine 1 respond to both charging requests and power supply requests. In the prior art, only fixed charging start and stop thresholds are often set. Therefore, the superposition of charging requests and power supply requests can lead to problems such as frequent starting and stopping of the engine 1, and restarting the engine 1 within a short period of time after stopping. At the same time, the prior art also has the problem that the conditions required to meet the charging start request are overly simple, considering only the needs of the battery itself. This can result in the presence of a charging start request during coasting energy recovery or braking energy recovery, causing energy recovery and engine power generation to charge the power battery simultaneously. This charging method can have a negative impact on vehicle economy.

[0042] Figure 2A method flow chart of a method for determining a charging request of a power battery provided by an embodiment of the present invention, referring to Figure 2 In response to the above problem, an embodiment of the present invention provides a method for determining a charging request of a power battery, comprising:

[0043] S1: Determine the charging setting condition based on the charge state of the power battery, the start threshold, the stop threshold, the start request and the engine status.

[0044] Among them, the state of charge of the power battery can be determined by reading the parameters provided by the battery management system of the power battery. The start threshold and the stop threshold can be determined according to actual needs. The start request may include a charging start request, and may also include other start requests other than the charging start request, such as an output power start request. The engine status refers to the working state of the engine, for example, the engine can be in a running state and the engine can be in a stopped state. When the charging setting condition is determined to be valid, the controller in the vehicle for controlling the start and stop of the engine (such as the vehicle controller) will combine other conditions to comprehensively determine whether to start the engine to charge the battery.

[0045] Optionally, the charging setting condition is that the state of charge of the power battery is less than the start threshold, or the state of charge of the power battery is less than the stop threshold and other start requests except the charging start request are valid and the engine is in the running state.

[0046] The engine being in an operating state may mean that the engine is idling at a preset speed and can normally output positive torque. The preset speed can be determined based on actual needs. When the charge setting condition is met, the charge setting condition flag in the controller used to control engine start and stop can be set to valid, so that the controller can make decisions on starting and stopping the engine.

[0047] Optionally, the sum of the start threshold and the offset threshold is the stop threshold, the offset threshold includes a basic offset and an extended offset, and the extended offset is the maximum value of the static offset and the dynamic offset.

[0048] To determine the start and stop thresholds, one of the start and stop thresholds can be determined based on actual needs, and then the other can be calculated based on the offset threshold. For example, the start threshold can be determined based on actual needs, and then the offset threshold can be added to the start threshold to obtain the stop threshold. The base offset in the offset threshold can be a fixed value and can be determined based on actual needs. The extended offset, on the other hand, is a variable and can change based on real-time vehicle parameters. The extended offset is the maximum value of the static offset and the dynamic offset. The values ​​of the static offset and the dynamic offset can be determined based on the vehicle's operating conditions.

[0049] Figure 3A method flow chart of a method for determining a static offset provided by an embodiment of the present invention, referring to Figure 3 Optionally, the method for determining the static offset includes:

[0050] S111: Determine whether the vehicle is in the first operating condition.

[0051] S112: If the first operating condition is satisfied, a minimum start interval under the first operating condition is calculated, where the minimum start interval is a minimum value greater than or equal to a start time interval threshold.

[0052] S113: Calculate the number of starts and stops corresponding to the minimum start interval during the first operating period.

[0053] S114: Determine the product of the number of starts and stops and the single extension amount as a reference static offset.

[0054] S115: Select the minimum value between the reference static offset and the extended maximum offset as the static offset.

[0055] Among them, the first operating condition is that after the high-voltage power-up is completed, the vehicle's gear is in the parking gear, neutral gear or forward automatic shift gear, and the vehicle's speed is less than the sum of the vehicle's target creeping speed and the speed offset, and the throttle opening is less than the preset throttle threshold.

[0056] The first operating condition can be a stationary vehicle operating condition or a creeping vehicle operating condition. Specific criteria for determining the first operating condition include: after high-voltage power-up is complete, the vehicle's gear is in any of the following: park, neutral, or forward automatic shift gear; the vehicle speed is less than the sum of the target creep speed and the speed offset; and the throttle opening is less than a preset throttle threshold. When the vehicle is started, the high-voltage circuit is powered up to prepare to supply power to high-voltage components such as the motor and its drive circuit. The vehicle speed refers to the vehicle's real-time speed and can be determined based on reported real-time speed measurement results. The target creep speed refers to the desired creep speed, and the speed offset refers to the maximum allowable deviation from the target creep speed. The target creep speed and speed offset can be determined based on actual needs. The throttle opening can be the real-time throttle opening obtained by the throttle sensor. The preset throttle threshold can be a throttle opening threshold determined based on actual needs. The minimum start interval under the first operating condition can be calculated by adding a unit interval to the minimum start interval base value and comparing the calculated minimum start interval intermediate value with the start interval threshold. If the minimum start interval intermediate value is not greater than or equal to the start interval threshold, the unit interval is further added to the minimum start interval intermediate value to generate a new minimum start interval intermediate value. This cycle continues until the new minimum start interval intermediate value is just greater than or equal to the start interval threshold. This minimum start interval intermediate value is used as the minimum start interval. The minimum start interval is expressed in minutes / time and represents the minimum engine start interval. The unit interval is the minimum accumulated interval time and can be determined based on actual needs. The duration of the first operating condition is then calculated and divided by the minimum start interval to obtain the number of starts and stops corresponding to the minimum start interval during the first operating condition period. The product of the number of starts and stops and the single extension value is then determined as the reference static offset. The single extension value is a fixed value and can be determined based on actual needs. The minimum value between the reference static offset and the extended maximum offset is then selected as the static offset. The extended maximum offset is the preset state of charge of the power battery. The preset state of charge can be the maximum state of charge of the power battery or a state of charge determined according to actual needs. The purpose of comparing the reference static offset with the extended maximum offset is to prevent errors in the calculation or acquisition process from causing significant errors in the static offset. This improves the stability and reliability of this embodiment.

[0057] Optionally, if the first operating condition is not met, the static offset is zero.

[0058] The static offset is an offset corresponding to the first operating condition. When the vehicle is not in the first operating condition, the static offset may be determined to be zero.

[0059] Figure 4A method flow chart of a method for determining a dynamic offset provided by an embodiment of the present invention, referring to Figure 4 Optionally, the method for determining the dynamic offset includes:

[0060] S121: Determine whether the vehicle is in the second operating condition.

[0061] S122: If the second operating condition is met, the vehicle speed is obtained, and the dynamic offset is determined according to the vehicle speed-dynamic offset correspondence table. When the vehicle speed is lower than the speed threshold, the dynamic offset increases as the vehicle speed increases. When the vehicle speed is higher than the speed threshold, the dynamic offset decreases as the vehicle speed increases.

[0062] Among them, the second operating condition is that the vehicle's gear is in the forward automatic shift gear, and the vehicle meets the preset speed and throttle conditions; the preset speed and throttle conditions are that the vehicle's speed is greater than the sum of the preset speed threshold and the speed extension amount, or the vehicle's throttle is greater than the sum of the preset throttle threshold and the throttle extension amount.

[0063] The second operating condition may be the condition during vehicle acceleration. Specific criteria for determining the second operating condition include: the vehicle's gear is in a forward automatic shift position, and the vehicle's speed is greater than the sum of a preset speed threshold and a speed extension. Alternatively, the vehicle's gear is in a forward automatic shift position, and the vehicle's throttle is greater than the sum of a preset throttle threshold and a throttle extension. The vehicle's speed refers to the vehicle's real-time speed. The preset speed threshold may be a fixed value that can be determined based on actual needs. The speed extension is the maximum allowable error value added to the preset speed threshold and can be determined based on actual needs. The vehicle's throttle refers to the vehicle's real-time throttle status and can be determined by obtaining information from a throttle sensor. The preset throttle threshold may be a fixed value that can be determined based on actual needs. The throttle extension is the maximum allowable error value added to the preset throttle threshold and can be determined based on actual needs. When determining that the vehicle is in the second operating condition, the dynamic offset may be determined by searching a database for a corresponding relationship. Specifically, after collecting the vehicle's speed, the database is searched for a speed-dynamic offset mapping table based on the speed, and the dynamic offset corresponding to the speed is determined. The speed-dynamic offset mapping can be established according to the following rules: when the vehicle's speed is below a speed threshold, the dynamic offset increases as the speed increases; when the vehicle's speed exceeds the speed threshold, the dynamic offset decreases as the speed increases. The speed threshold can be determined based on actual needs. This setting primarily takes into account the driver's increased power requirements as speed increases. By adjusting the dynamic offset, the shutdown threshold is increased, reserving sufficient battery assist power for the vehicle. When the speed exceeds the speed threshold, the dynamic offset decreases, primarily to allow for energy recovery to drain the battery's state of charge. After determining the dynamic offset, it should also be verified that the offset threshold does not exceed the battery management system's maximum state of charge. If the offset threshold exceeds the battery management system's maximum state of charge, the offset threshold is considered incorrectly calculated and should be recalculated.

[0064] Optionally, if the second operating condition is not met, the dynamic offset is zero.

[0065] The dynamic offset is an offset corresponding to the second operating condition. When the vehicle is not in the second operating condition, the dynamic offset can be determined to be zero.

[0066] S2: Determine the charging reset condition based on the charge state of the power battery, the shutdown threshold and the operating condition of the vehicle.

[0067] The charging reset condition can be used to determine subsequent charging stop requests and charging start requests, and serve as a basis for engine start / stop determination.

[0068] Optionally, the charging reset condition is that the charge state of the power battery is greater than the shutdown threshold, or the vehicle is in a coasting energy recovery condition or a braking energy recovery condition.

[0069] The criteria for determining whether the vehicle is in coasting or braking energy regeneration can be that the vehicle's real-time speed is greater than the reset condition speed, the driver releases the brake pedal, and the wheel-end power demand is less than the reset condition power. The reset condition power can be a negative value, and the reset condition speed and reset condition power can be determined based on actual needs.

[0070] S31: When the charge set condition and the charge reset condition are met at the same time, a charge stop request is output.

[0071] S32: When the charge reset condition is not met but the charge set condition is met, a charge start request is output.

[0072] Among them, the default output is charging stop request.

[0073] Among them, the priority of the charging reset condition is higher than the charging setting condition. When both the charging setting condition and the charging reset condition are invalid, the output is based on the previous state. The embodiment of the present invention determines the charging start request and the charging stop request through the charging setting condition and the charging reset condition, wherein the charging setting condition and the charging reset condition can be determined in real time according to the vehicle parameters. The charging setting condition and the charging reset condition are determined by collecting various vehicle parameters, so that the charging setting condition and the charging reset condition change continuously according to the changes in various parameters. The purpose of adjusting the engine start and stop conditions according to the real-time status of the vehicle is achieved. It avoids problems such as frequent engine start and stop, and restarting the engine within a short time after shutdown. It improves the fuel economy of the engine and improves the driving experience of the driver.

[0074] Figure 5 A schematic diagram of a charging request determination device for a power battery according to an embodiment of the present invention is provided. Figure 5 The embodiment of the present invention further provides a device for determining a charging request of a power battery, comprising:

[0075] The charging setting condition determination module 01 is used to determine the charging setting condition according to the charge state of the power battery, the start threshold, the stop threshold, the start request and the engine state;

[0076] The charging reset condition determination module 02 is used to determine the charging reset condition according to the state of charge of the power battery, the shutdown threshold and the operating condition of the vehicle;

[0077] The charging stop request output module 03 is used to output a charging stop request when both the charging set condition and the charging reset condition are met;

[0078] The charging start request output module 04 is used to output a charging start request when the charging reset condition is not met and the charging set condition is met;

[0079] Among them, the default output is charging stop request.

[0080] The device for determining a charging request for a power battery provided in an embodiment of the present invention has the corresponding functional modules and beneficial effects of the method for determining a charging request for a power battery provided in any embodiment of the present invention.

[0081] An embodiment of the present invention further provides a controller, the above-mentioned device for determining a charging request of a power battery.

[0082] Among them, the vehicle electrical system provided by the embodiment of the present invention includes the vehicle electronic control unit provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects.

[0083] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope 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 scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for determining a charging request of a power battery, characterized in that: include: Determine the charging setting conditions based on the power battery's state of charge, start threshold, stop threshold, start request, and engine status; Determining a charging reset condition according to the state of charge of the power battery, the shutdown threshold and the operating condition of the vehicle; When the charging setting condition and the charging reset condition are simultaneously met, outputting a charging stop request; When the charging reset condition is not met and the charging setting condition is met, outputting a charging start request; Wherein, the charging stop request is output by default; The sum of the start threshold and the offset threshold is the stop threshold, the offset threshold includes a basic offset and an extended offset, and the extended offset is the maximum value of the static offset and the dynamic offset; The method for determining the static offset includes: determining whether the vehicle is in a first operating condition; If the first operating condition is satisfied, calculating a minimum start interval under the first operating condition, where the minimum start interval is a minimum value greater than or equal to a start time interval threshold; Calculating the number of starts and stops corresponding to the minimum start interval during the first operating period; The product of the number of starts and stops and the single expansion amount is determined as a reference static offset; Selecting a minimum value between the reference static offset and the extended maximum offset as the static offset; Among them, the first operating condition is that after the high-voltage power-up is completed, the gear position of the vehicle is in the parking gear, neutral gear or forward automatic shift gear, and the speed of the vehicle is less than the sum of the vehicle's target creeping speed and the speed offset, and the throttle opening is less than the preset throttle threshold; the extended maximum offset is the preset charge state of the power battery.

2. The method for determining a charging request of a power battery according to claim 1, characterized in that: The charging reset condition is that the state of charge of the power battery is greater than the shutdown threshold, or the vehicle is in a coasting energy recovery operating condition or a braking energy recovery operating condition.

3. The method for determining a charging request of a power battery according to claim 1, characterized in that: The charging setting condition is that the state of charge of the power battery is less than the start threshold, or the state of charge of the power battery is less than the stop threshold and other start requests other than the charging start request are valid and the engine is in a running state.

4. The method for determining a charging request of a power battery according to claim 1, wherein: If the first operating condition is not met, the static offset is zero.

5. The method for determining a charging request of a power battery according to claim 1, characterized in that: The method for determining the dynamic offset includes: determining whether the vehicle is in a second operating condition; If the second operating condition is met, the vehicle speed is obtained, and the dynamic offset is determined according to a vehicle speed-dynamic offset correspondence table, where when the vehicle speed is lower than a speed threshold, the dynamic offset increases as the vehicle speed increases, and when the vehicle speed is higher than the speed threshold, the dynamic offset decreases as the vehicle speed increases; Among them, the second operating condition is that the gear position of the vehicle is in the forward automatic shift gear position, and the vehicle meets the preset speed and throttle conditions; the preset speed and throttle conditions are that the speed of the vehicle is greater than the sum of the preset speed threshold and the speed extension amount, or the throttle of the vehicle is greater than the sum of the preset throttle threshold and the throttle extension amount.

6. The method for determining a charging request of a power battery according to claim 5, characterized in that: If the second operating condition is not met, the dynamic offset is zero.

7. A device for determining a charging request of a power battery, characterized in that: include: a charging setting condition determination module, the charging setting condition determination module being configured to determine the charging setting condition based on the state of charge of the power battery, the start threshold, the stop threshold, the start request, and the engine state; a charging reset condition determination module, configured to determine a charging reset condition based on the state of charge of the power battery, the shutdown threshold, and the operating condition of the vehicle; a charging stop request output module, configured to output a charging stop request when both the charging set condition and the charging reset condition are satisfied; a charging start request output module, configured to output a charging start request when the charging reset condition is not met but the charging set condition is met; Wherein, the charging stop request is output by default; The sum of the start threshold and the offset threshold is the stop threshold, the offset threshold includes a basic offset and an extended offset, and the extended offset is the maximum value of the static offset and the dynamic offset; The method for determining the static offset includes: determining whether the vehicle is in a first operating condition; If the first operating condition is satisfied, calculating a minimum start interval under the first operating condition, where the minimum start interval is a minimum value greater than or equal to a start time interval threshold; Calculating the number of starts and stops corresponding to the minimum start interval during the first operating period; The product of the number of starts and stops and the single expansion amount is determined as a reference static offset; Selecting a minimum value between the reference static offset and the extended maximum offset as the static offset; Among them, the first operating condition is that after the high-voltage power-up is completed, the gear position of the vehicle is in the parking gear, neutral gear or forward automatic shift gear, and the speed of the vehicle is less than the sum of the vehicle's target creeping speed and the speed offset, and the throttle opening is less than the preset throttle threshold; the extended maximum offset is the preset charge state of the power battery.

8. A controller, characterized in that: Includes the charging request determination device for the power battery as described in claim 7.

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