Vehicle energy recovery intensity assessment method

Abstract

The present invention provides a method for evaluating vehicle energy recovery intensity, comprising the following steps: S1: acquiring vehicle driving parameters in real time; determining whether the vehicle has entered an energy recovery phase based on the driving parameters; if so, proceeding to step S2; S2: determining the vehicle's energy recovery intensity level based on the driving parameters and preset energy recovery determination rules; and S3: controlling the vehicle to perform energy recovery based on the vehicle's energy recovery intensity level. The vehicle's driving parameters include vehicle speed, accelerator pedal opening, and deceleration. The present invention determines the vehicle's energy recovery level based on the preset energy recovery determination rules, thereby evaluating the vehicle's energy recovery intensity and matching the vehicle's energy recovery intensity with braking feel. This supports the development and setting of energy recovery intensity and enhances the user's driving experience.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a vehicle energy recovery intensity evaluation method. Background Art

[0002] Currently, single-pedal technology is a key technology being applied to new energy vehicles. It not only simplifies driving but also achieves energy savings through reverse braking of the motor. Coasting energy regeneration control typically uses a regeneration map to determine the negative torque corresponding to different vehicle speeds and accelerator pedal conditions. This torque is then sent to the motor as the requested torque. The motor controller then calculates the regenerated power and charging current to charge the battery pack.

[0003] Energy recovery in the development of pure electric vehicles generally has multiple intensity modes. Currently, there is no system for evaluating different energy recovery intensities, and the definition of energy recovery intensity varies greatly among different brands of vehicles. For example, the braking feel corresponding to the strong energy recovery mode on vehicle A is the same as the braking feel corresponding to the weak energy recovery mode on vehicle B. As a result, the braking feel of the strong energy recovery mode on vehicle A is not as strong as that of the weak energy recovery mode on vehicle B, causing confusion for users about the poor driving experience.

[0004] After searching relevant patent documents, the following patents on energy recovery intensity are found:

[0005] Chinese patent publication number CN111959286B discloses a "Method, Device, and Medium for Controlling Coasting Energy Regeneration Intensity in Electric Vehicles." This patent primarily describes how to determine the required deceleration based on accelerator pedal position, vehicle speed, and distance to the preceding vehicle; and how to adjust the required regeneration torque to ensure the current deceleration is the desired deceleration. However, the patent does not define the regeneration intensity; it simply implements braking according to the desired deceleration.

[0006] Chinese patent publication number CN113997792A discloses a "Method and Device for Adaptively Controlling Vehicle Energy Regeneration Intensity." Like the aforementioned prior patents, this patent discloses controlling the actual vehicle deceleration based on the desired deceleration and the deceleration limit for energy regeneration to achieve energy regeneration. However, it also fails to define the energy regeneration intensity. Summary of the Invention

[0007] The purpose of the present invention is to solve the problem that in the development of existing electric vehicles, multiple energy recovery intensity modes are set, but there is no system for evaluating different energy recovery intensities. In addition, different brands have very different definitions of energy recovery intensity, which makes the same energy recovery intensity show different effects and different braking feelings in different brands, resulting in a poor driving experience for users.

[0008] To solve the above problems, the embodiments of the present invention disclose a method for evaluating vehicle energy recovery intensity. The method comprises the following steps:

[0009] S1: Acquire the vehicle's driving parameters in real time; determine whether the vehicle has entered the energy recovery phase based on the driving parameters; if so, proceed to step S2;

[0010] S2: Determine the energy recovery intensity level of the vehicle based on driving parameters and preset energy recovery judgment rules;

[0011] S3: Control the vehicle to perform energy recovery according to the energy recovery intensity level of the vehicle;

[0012] Among them, the vehicle's driving parameters include vehicle speed, accelerator pedal opening and deceleration.

[0013] By adopting the above scheme, whether the vehicle has entered the coasting energy recovery stage is determined based on the vehicle's driving parameters, namely the vehicle speed and the accelerator pedal opening, and the vehicle's energy recovery intensity level is evaluated based on the driving parameters and the preset energy recovery judgment rules, which supports the development and setting of the energy recovery intensity and improves the user's driving experience.

[0014] According to another specific embodiment of the present invention, in the vehicle energy recovery intensity evaluation method disclosed in the embodiment of the present invention, the energy recovery intensity levels include a strong energy recovery level, a medium energy recovery level, and a weak energy recovery level.

[0015] By adopting the above solution, energy recovery is divided into three levels, which makes it convenient for users to set the energy recovery intensity according to their needs and improve the user's driving experience.

[0016] According to another specific embodiment of the present invention, a vehicle energy recovery intensity assessment method disclosed in an embodiment of the present invention includes a preset energy recovery judgment rule comprising: setting multiple accelerator pedal openings, each accelerator pedal opening having a corresponding vehicle speed, deceleration, and energy recovery intensity relationship diagram; wherein the accelerator pedal opening is less than an accelerator pedal opening threshold;

[0017] The vehicle energy recovery intensity evaluation method further includes obtaining a plurality of vehicle speed, deceleration, and energy recovery intensity relationship diagrams corresponding to a plurality of accelerator pedal openings, including:

[0018] S001: Determine a deceleration range for each energy recovery intensity level corresponding to each vehicle speed interval in a plurality of vehicle speed intervals;

[0019] S002: After the vehicle is controlled to travel at a specific constant speed, the accelerator pedal opening is controlled to one of a plurality of accelerator pedal openings; wherein the specific speed is greater than a maximum value of a preset energy recovery speed range;

[0020] S003: collecting vehicle speed and deceleration in real time, determining a deceleration range within which the deceleration falls based on the accelerator pedal opening, vehicle speed, and deceleration; and determining an energy recovery intensity level based on the determined deceleration range;

[0021] S004: Based on the accelerator pedal opening, the real-time collected vehicle speed and deceleration, and the determined energy recovery intensity level, a relationship diagram of the vehicle speed, deceleration, and energy recovery intensity corresponding to the accelerator pedal opening is obtained.

[0022] By adopting the above scheme, the relationship diagram of vehicle speed, deceleration and energy recovery intensity corresponding to the accelerator pedal opening is more accurate, which can improve the accuracy of energy recovery intensity assessment and facilitate subsequent use.

[0023] According to another specific embodiment of the present invention, in the vehicle energy recovery intensity evaluation method disclosed in the embodiment of the present invention, in step S001, determining the deceleration range of each energy recovery intensity level corresponding to each speed interval in a plurality of speed intervals includes:

[0024] The vehicle speed, deceleration, and deceleration perception of multiple vehicles are collected in real time during driving; based on the speed intervals and deceleration ranges corresponding to different deceleration perceptions, the deceleration range corresponding to each energy recovery intensity level in each of the multiple speed intervals is determined; wherein,

[0025] Different deceleration levels include not obvious, obvious and strong, which correspond to strong energy recovery, medium energy recovery and weak energy recovery respectively.

[0026] The above solution is adopted, and the deceleration range is determined in combination with the user's perception, which then corresponds to different energy recovery levels. This represents the mainstream level of energy recovery, conforms to the human perception of most people, and enhances the user's driving experience.

[0027] According to another specific embodiment of the present invention, in the vehicle energy recovery intensity evaluation method disclosed in the embodiment of the present invention, the accelerator pedal opening is 0%, the vehicle speed range is 50 km / h to 80 km / h, and the deceleration range set for each energy recovery intensity level is:

[0028] The deceleration range for the weak energy recovery level is 0.02g to 0.08g; the deceleration range for the medium energy recovery level is 0.08g to 0.15g; the deceleration range for the strong energy recovery level is 0.15g to 0.22g; where g is the acceleration due to gravity, which is 9.8m / s 2 .

[0029] With the above solution, when the vehicle deceleration is in different ranges, corresponding different energy recovery intensity levels are assigned to it, which facilitates the evaluation of the energy recovery intensity level.

[0030] According to another specific embodiment of the present invention, the vehicle energy recovery intensity evaluation method disclosed in the embodiment of the present invention, step S2 further includes:

[0031] S201: Determine a corresponding relationship diagram of accelerator pedal opening, deceleration, and energy recovery intensity according to vehicle speed;

[0032] S202: Determine the energy recovery intensity of the vehicle according to the deceleration, the vehicle speed, and the determined relationship diagram between the accelerator pedal opening, the deceleration, and the energy recovery intensity.

[0033] By adopting the above scheme, the speed of judging the vehicle energy recovery intensity level is improved according to the relationship diagram between the accelerator pedal opening, deceleration and energy recovery intensity.

[0034] According to another specific embodiment of the present invention, the vehicle energy recovery intensity assessment method disclosed in the embodiment of the present invention, in step S1, the step of determining whether the vehicle enters the energy recovery stage based on the vehicle driving parameters includes: S101: determining whether the vehicle speed is within a preset energy recovery speed range; if so, proceeding to step 102; if not, continuing to obtain the vehicle speed; S102: determining whether the accelerator pedal opening is less than a preset accelerator pedal opening threshold; if so, proceeding to step S2; if not, continuing to obtain the vehicle speed.

[0035] The above scheme requires both vehicle speed and accelerator pedal opening as conditions for determining whether the vehicle enters the energy recovery phase, eliminating other influencing factors during driving and improving the accuracy of energy recovery intensity assessment after entering energy recovery.

[0036] According to another specific embodiment of the present invention, the vehicle energy recovery intensity assessment method disclosed in the embodiment of the present invention has a preset energy recovery speed range of 8 km / h-180 km / h and a preset accelerator pedal opening threshold of 5%.

[0037] According to another specific embodiment of the present invention, the vehicle energy recovery intensity evaluation method disclosed in the embodiment of the present invention calculates the deceleration according to the following formula:

[0038]

[0039] Where a is the vehicle deceleration in m / s 2 ; M is the vehicle weight, in kg; F v is the vehicle's driving resistance, in N; Tmotor is the torque of the motor's energy recovery, in Nm; i is the vehicle's main reducer speed ratio; r is the wheel's rolling radius, in m.

[0040] According to another specific embodiment of the present invention, a vehicle energy recovery intensity assessment method disclosed in an embodiment of the present invention obtains the vehicle weight each time the vehicle is started. The step of obtaining the vehicle weight includes: collecting the weight of four positions of the vehicle: the left front, the right front, the left rear, and the right rear, respectively, and calculating the sum of the weights of the four positions and the unsprung mass of the vehicle to obtain the vehicle weight.

[0041] With the above solution, when the vehicle speed is 0, the vehicle stops and may perform a weight reduction or weight increase operation. At this time, the current vehicle weight is recalculated, which improves the accuracy of the weight parameters, ensures the accuracy of the acceleration calculation, and further ensures the accuracy of the energy recovery intensity level judgment.

[0042] The beneficial effects of the present invention are:

[0043] The energy recovery intensity assessment method provided by the present invention determines whether the vehicle has entered the energy recovery stage by obtaining the vehicle's driving parameters, determines the vehicle's energy recovery intensity level based on the driving parameters and preset energy recovery judgment rules, and controls the vehicle to perform energy recovery based on the vehicle's energy recovery intensity level. This defines an energy recovery intensity assessment method, which solves the problem of multiple intensity modes for energy recovery settings in existing electric vehicle development, and large differences in the definition of energy recovery intensity, resulting in a poor user driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 1 is a flow chart of a method for evaluating vehicle energy recovery intensity provided by an embodiment of the present invention;

[0045] Figure 2 This is a relationship diagram between vehicle speed, deceleration, and energy recovery intensity obtained when the accelerator pedal opening is controlled to 0% during a test on a certain vehicle model in the vehicle energy recovery intensity evaluation method provided by an embodiment of the present invention;

[0046] Figure 3 This is a relationship diagram between the accelerator pedal opening, deceleration, and energy recovery intensity obtained when the vehicle speed is 80 km / h in the vehicle energy recovery intensity evaluation method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0048] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0049] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0050] To address the problem of multiple energy recovery intensity modes in existing electric vehicle development, but without a system for evaluating different energy recovery intensities, and the significant discrepancies in the definition of energy recovery intensity across different brands, resulting in different effects and braking feel for the same energy recovery intensity level in vehicles of different brands, leading to a poor driving experience for users, the present invention discloses a vehicle energy recovery intensity assessment method. This method can evaluate the vehicle energy recovery level intensity at different vehicle speeds and accelerator pedal openings by determining whether the vehicle deceleration falls within a deceleration range defined in a preset energy recovery judgment rule. This method supports the development and setting of energy recovery intensity and enhances the user driving experience.

[0051] The present invention provides a vehicle energy recovery intensity assessment method, which is executed by an energy recovery system. The energy recovery system includes a controller, which can be specifically integrated into a vehicle controller, and also includes a collection device connected to the controller.

[0052] Next, combine Figure 1-Figure 3 , the vehicle energy recovery intensity evaluation method provided by the present invention is described in detail.

[0053] like Figure 1As shown, the energy recovery intensity evaluation method provided by the present invention includes: S1: acquiring the vehicle's driving parameters in real time; judging whether the vehicle enters the energy recovery stage according to the driving parameters; if so, entering step S2; S2: determining the vehicle's energy recovery intensity level according to the driving parameters and preset energy recovery judgment rules; S3: controlling the vehicle to perform energy recovery according to the vehicle's energy recovery intensity level; wherein the vehicle's driving parameters include vehicle speed, accelerator pedal opening and deceleration.

[0054] The following further explains the vehicle energy recovery intensity evaluation method in conjunction with the energy recovery system.

[0055] S1: Real-time acquisition of vehicle driving parameters; determining whether the vehicle has entered the energy recovery phase based on the driving parameters; if so, proceeding to step S2. The driving parameters include vehicle speed, accelerator pedal opening, and deceleration.

[0056] It should be noted that the vehicle's driving parameters are acquired through a collection device in the energy recovery system in order to determine whether the vehicle has entered the energy recovery phase in subsequent steps.

[0057] Furthermore, if it is determined based on the driving parameters that the vehicle has not entered the energy recovery phase, it is necessary to continue executing step S1 to obtain the vehicle's driving parameters in real time.

[0058] Furthermore, the acquisition device includes wheel speed sensors and a vehicle controller for acquiring vehicle speed. Wheel speed sensors located on the rims of the four wheels can be used to acquire the wheel speeds of the four wheels in real time, and the acquired wheel speed signals are sent to the vehicle controller. The vehicle controller calculates the current vehicle speed S = 2πR*C based on the acquired wheel speed C (the number of wheel rotations per unit time, taking the average of the four wheel speeds, front, rear, left, and right) and the tire's rolling radius R (the tire's rolling radius can be determined based on the tire model), and sends the current vehicle speed to the controller of the energy recovery system provided by the present invention. The current vehicle speed is generally displayed on the vehicle's dashboard, but it can also be calculated by the vehicle controller and then sent to the dashboard for display.

[0059] Furthermore, the acquisition device also includes a pedal position sensor for obtaining the accelerator pedal opening. It should be noted that the pedal position sensor uses a sliding resistor (the resistance varies with the length and area of the component) to sense the accelerator pedal depth. The measured resistance value is converted into a voltage signal and transmitted to the controller, which uses this signal to control the throttle valve opening.

[0060] The deceleration rate can be calculated by the vehicle controller based on some collected driving parameters. The calculation method for the vehicle deceleration rate can be pre-set and stored in the controller. Therefore, the vehicle driving parameters required for the calculation process are also pre-determined. The acquired vehicle driving parameters can include the vehicle speed and accelerator pedal opening, as listed in this embodiment. Depending on the calculation method for the determined deceleration rate, more driving parameters, such as vehicle weight and vehicle driving resistance, can also be included. Those skilled in the art can configure these parameters as needed.

[0061] In one embodiment of the present invention, the calculation formula for deceleration is:

[0062]

[0063] Where a is the vehicle deceleration, which is normally a negative value and is expressed in m / s. 2 ; M is the vehicle weight, in kg; F v is the vehicle's driving resistance, in N; Tmotor is the torque of the motor's energy recovery, in Nm; i is the vehicle's main reducer speed ratio; r is the wheel's rolling radius, in m.

[0064] Furthermore, the vehicle mass can be obtained from the factory or measured over a certain period of time. In one embodiment of the present invention, to improve parameter accuracy, the vehicle weight is obtained each time the vehicle is started. The step of obtaining the vehicle weight includes: collecting weights at four locations: vehicle, right front, left rear, and right rear, and calculating the sum of the weights at the four locations and the vehicle's unsprung mass to obtain the vehicle weight.

[0065] More specifically, the collection device includes an air spring controller. A vehicle equipped with air suspension is provided with multiple air spring controllers, which are arranged on the four shock absorbers in the front, rear, left and right directions respectively. Each air spring controller can collect the weight borne by its own spring, and collect the left front weight G1, right front weight G2, left rear weight G3, and right rear weight G4 respectively through the air spring controller. The four weights are transmitted to the controller to calculate the weight of the entire vehicle G, G=G1+G2+G3+G3+G5, where G5 is the unsprung mass of the vehicle, specifically refers to the weight not supported by the vehicle suspension system, including springs, shock absorbers, upper and lower control arms, wheels, tires, brake discs, partial mass of the drive shaft, etc., which can be obtained when the vehicle design is completed.

[0066] Furthermore, the acquisition device includes a tachometer, which processes the received digital pulse signal (sent by the sensor) and directly reads it into the counting port of the controller to obtain the motor torque.

[0067] According to one embodiment of the present invention, the energy recovery intensity levels include a strong energy recovery level, a medium energy recovery level, and a weak energy recovery level. The energy recovery level can also be set to stepless adjustment, etc., and those skilled in the art can set it according to specific needs.

[0068] According to one embodiment of the present invention, the step of determining whether the vehicle enters the energy recovery stage based on the vehicle driving parameters includes: S101: determining whether the vehicle speed is within a preset energy recovery speed range; if so, proceeding to step 102; if not, continuing to obtain the vehicle speed; S102: determining whether the accelerator pedal opening is less than a preset accelerator pedal opening threshold; if so, proceeding to step S2; if not, continuing to obtain the vehicle speed.

[0069] At the same time, the vehicle speed and accelerator pedal opening are required as conditions for judging whether the vehicle has entered the energy recovery stage, eliminating other influencing factors during driving and improving the accuracy of energy recovery intensity assessment after entering energy recovery.

[0070] Specifically, the energy recovery speed range and the accelerator pedal opening threshold can be obtained based on vehicle test calibration.

[0071] S2: Determine the energy recovery intensity level of the vehicle based on driving parameters and preset energy recovery judgment rules.

[0072] S201: Determine a corresponding relationship diagram of accelerator pedal opening, deceleration, and energy recovery intensity according to vehicle speed;

[0073] S202: Determine the energy recovery intensity of the vehicle according to the deceleration, the vehicle speed, and the determined relationship diagram between the accelerator pedal opening, the deceleration, and the energy recovery intensity.

[0074] It should be noted that the relationship between accelerator pedal opening, deceleration, and energy recovery intensity can be obtained through vehicle testing and calibration. After obtaining the relationship between accelerator pedal opening, deceleration, and energy recovery intensity at different speed ranges, it is stored in the vehicle's memory. When the vehicle enters the energy recovery phase, after collecting the vehicle speed, the vehicle's energy recovery intensity level can be determined based on the preset energy recovery judgment rules.

[0075] According to one embodiment of the present invention, a preset energy recovery judgment rule is as follows: multiple accelerator pedal openings are set, each accelerator pedal opening having a corresponding relationship diagram between vehicle speed, deceleration, and energy recovery intensity; wherein the accelerator pedal opening is less than an accelerator pedal opening threshold;

[0076] The vehicle energy recovery intensity evaluation method further includes obtaining a plurality of vehicle speed, deceleration, and energy recovery intensity relationship diagrams corresponding to a plurality of accelerator pedal openings, including:

[0077] S001: Determine a deceleration range for each energy recovery intensity level corresponding to each vehicle speed interval in a plurality of vehicle speed intervals;

[0078] S002: After the vehicle is controlled to travel at a specific constant speed, the accelerator pedal opening is controlled to one of a plurality of accelerator pedal openings; wherein the specific speed is greater than a maximum value of a preset energy recovery speed range;

[0079] S003: collecting vehicle speed and deceleration in real time, determining a deceleration range within which the deceleration falls based on the accelerator pedal opening, vehicle speed, and deceleration; and determining an energy recovery intensity level based on the determined deceleration range;

[0080] S004: Based on the accelerator pedal opening, the real-time collected vehicle speed and deceleration, and the determined energy recovery intensity level, a relationship diagram of vehicle speed, deceleration, and energy recovery intensity corresponding to the accelerator pedal opening is obtained. Figure 2 The figure shows the relationship between vehicle speed, deceleration and energy recovery intensity when the accelerator pedal opening is controlled at 0% during a test of a certain vehicle model conducted by the present invention. It can be seen from the figure that the deceleration range corresponding to the vehicle's weak energy recovery level is 0.02g~0.08g; the deceleration range corresponding to the medium energy recovery level is 0.08g~0.15g; and the deceleration range corresponding to the strong energy recovery level is 0.15g~0.22g.

[0081] Furthermore, the present invention also converts the obtained relationship diagram of vehicle speed, deceleration and energy recovery intensity corresponding to different accelerator pedal openings to obtain the relationship diagram of throttle opening, deceleration and energy recovery intensity corresponding to different vehicle speeds, wherein Figure 3 The graph shows the relationship between accelerator pedal opening, deceleration, and energy recovery intensity at a speed of 80 km / h. The graph shows that the vehicle deceleration changes linearly between 0% accelerator opening and the accelerator opening threshold.

[0082] The present invention can evaluate the energy recovery of the vehicle based on the relationship diagram of the throttle opening, deceleration and energy recovery intensity corresponding to different vehicle speeds, and determine whether adjustment is needed. For example, the energy recovery of model A at 0% throttle opening falls into the medium energy recovery intensity range, but most of the throttle openings above 0% fall into the weak energy recovery intensity range. The evaluation result is that the energy recovery linearity is poor, and the acceleration mutation is obvious and the driving experience is poor; it is necessary to optimize and increase the deceleration value above 0% throttle opening to the medium energy recovery range or reduce the deceleration value of 0% throttle opening to the weak energy recovery range. The energy recovery deceleration of model B at 0%-5% throttle opening is all in the strong energy recovery range, so it is evaluated as: strong energy recovery, and the energy recovery linearity is good, and no adjustment is required.

[0083] Determine the deceleration range corresponding to each energy recovery intensity level in multiple vehicle speed intervals. The deceleration range is used to divide the evaluation interval of the energy recovery intensity level. Determine the energy recovery intensity level according to the range of the deceleration interval within which the actual deceleration falls, which can improve the accuracy of the energy recovery intensity evaluation.

[0084] According to one embodiment of the present invention, in step S001, determining the deceleration range of each energy recovery intensity level corresponding to each speed interval in a plurality of speed intervals includes:

[0085] The vehicle speed, deceleration, and deceleration perception of multiple vehicles are collected in real time during driving; based on the speed intervals and deceleration ranges corresponding to different deceleration perceptions, the deceleration range corresponding to each energy recovery intensity level in each of the multiple speed intervals is determined; wherein,

[0086] Different deceleration levels include not obvious, obvious and strong, which correspond to strong energy recovery, medium energy recovery and weak energy recovery respectively.

[0087] Specifically, the different deceleration sensations and deceleration ranges corresponding to different vehicle speed ranges are determined by combining databases, ergonomics, and design experience. Specifically, by testing different vehicle decelerations and combining subjective evaluations, we can ultimately determine a threshold that meets the human perception expectations of most people, thereby improving the user's driving experience.

[0088] According to one embodiment of the present invention, the accelerator pedal opening is 0%, the vehicle speed range is 50 km / h to 80 km / h, and the deceleration range set for each energy recovery intensity level is: the deceleration range corresponding to the weak energy recovery level is 0.02g to 0.08g; the deceleration range corresponding to the medium energy recovery level is 0.08g to 0.15g; and the deceleration range corresponding to the strong energy recovery level is 0.15g to 0.22g; where g is the acceleration due to gravity, the value is 9.8m / s 2 .

[0089] Specifically, the maximum deceleration of a typical fuel-powered vehicle is 0.05g (varies at different speeds). Due to energy regeneration, pure electric vehicles experience greater deceleration than fuel-powered vehicles, typically exceeding 0.08g, which is noticeable to the human body. Therefore, the intensity of the low energy regeneration range is similar to or slightly higher than that of fuel-powered vehicles. Generally, 0.07g to 0.13g is the range within which regulations require the vehicle's brake lights to illuminate, indicating that the driver can clearly perceive the deceleration. Furthermore, 95% of daily driving conditions require no brake pedal intervention, thus defining the medium energy regeneration range. Generally, 0.2g represents the peak deceleration during energy regeneration for mainstream single-pedal vehicles. This value is sufficient for 98% of daily driving conditions and is the critical range for some occupants to experience significant physiological reactions (such as motion sickness). Therefore, the deceleration threshold for strong regeneration is 0.15g to 0.22g. This threshold was determined based on a combination of database, ergonomics, and design experience, and aligns with the perceived threshold of most people, thereby improving drivability.

[0090] According to one embodiment of the present invention, the preset energy recovery vehicle speed range is 8 km / h-180 km / h, and the preset accelerator pedal opening threshold is 5%.

[0091] S3: Control the vehicle to perform energy recovery according to the energy recovery intensity level of the vehicle.

[0092] Specifically, the vehicle controller retrieves the relationship diagram between the accelerator pedal opening, deceleration and energy recovery intensity corresponding to the current speed from the memory based on the data collected by the acquisition device, calculates the deceleration, determines the energy recovery intensity level based on the area in which the deceleration falls in the relationship diagram between the accelerator pedal opening, deceleration and energy recovery intensity, and performs energy recovery control on the vehicle at the corresponding level.

[0093] The vehicle recuperation intensity assessment method of this invention controls vehicle energy recuperation according to defined recuperation intensity levels. These levels, based on a database, ergonomics, and design experience, meet the thresholds expected by most people's human perception, thereby enhancing the user's driving experience. Furthermore, this invention standardizes recuperation standards, ensuring a consistent recuperation experience across different vehicle models.

[0094] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A method for evaluating vehicle energy recovery intensity, characterized in that: The following steps are involved: S1: Acquire driving parameters of the vehicle in real time; determine whether the vehicle enters the energy recovery phase according to the driving parameters; If yes, proceed to step S2; S2: Determining the energy recovery intensity level of the vehicle according to the driving parameters and a preset energy recovery judgment rule; S3: controlling the vehicle to perform energy recovery according to the energy recovery intensity level of the vehicle; Wherein, the driving parameters of the vehicle include vehicle speed, accelerator pedal opening and deceleration; The preset energy recovery judgment rule includes: setting a plurality of accelerator pedal openings, each of the accelerator pedal openings having a corresponding relationship diagram between vehicle speed, deceleration, and energy recovery intensity; wherein the accelerator pedal opening is less than an accelerator pedal opening threshold; The energy recovery intensity levels include strong energy recovery level, medium energy recovery level and weak energy recovery level; The vehicle energy recovery intensity evaluation method further includes obtaining a plurality of vehicle speed, deceleration, and energy recovery intensity relationship diagrams corresponding to a plurality of accelerator pedal openings, including: S001: determining a deceleration range for each energy recovery intensity level corresponding to each vehicle speed interval in a plurality of vehicle speed intervals; S002: After controlling the vehicle to travel at a specific speed, controlling the accelerator pedal opening to one of the plurality of accelerator pedal openings; wherein the specific speed is greater than a maximum value of a preset energy recovery speed range; S003: collecting vehicle speed and deceleration in real time, determining a deceleration range within which the deceleration falls based on the accelerator pedal opening, the vehicle speed, and the deceleration; and determining the energy recovery intensity level based on the determined deceleration range; S004: Based on the accelerator pedal opening, the vehicle speed and deceleration collected in real time, and the determined energy recovery intensity level, a relationship diagram of the vehicle speed, deceleration and energy recovery intensity corresponding to the accelerator pedal opening is obtained.

2. The vehicle energy recovery intensity evaluation method according to claim 1, characterized in that: In step S001, determining the deceleration range of each energy recovery intensity level corresponding to each speed interval in the plurality of speed intervals includes: The vehicle speed, deceleration, and deceleration perception level of multiple vehicles during driving are collected in real time; based on the vehicle speed intervals and deceleration ranges corresponding to different deceleration perception levels, the deceleration range corresponding to each energy recovery intensity level in each of the multiple speed intervals is determined; wherein, The different deceleration sensation levels include three levels: not obvious, obvious, and strong, which correspond to the strong energy recovery, the medium energy recovery, and the weak energy recovery, respectively.

3. The vehicle energy recovery intensity evaluation method according to claim 2, characterized in that: The accelerator pedal opening is 0%, the vehicle speed range is 50 km / h to 80 km / h, and the deceleration range set for each energy recovery intensity level is: The deceleration range for weak energy recovery is 0.02g to 0.08g; the deceleration range for medium energy recovery is 0.08g to 0.15g; the deceleration range for strong energy recovery is 0.15g to 0.22g; where g is the acceleration due to gravity, which is 9.8m / s 2 .

4. The vehicle energy recovery intensity evaluation method according to any one of claims 1 to 3, characterized in that: The step S2 further includes: S201: determining the corresponding relationship diagram of the accelerator pedal opening, deceleration, and energy recovery intensity according to the vehicle speed; S202: Determine the energy recovery intensity of the vehicle according to the deceleration, the vehicle speed, and the determined relationship diagram of the accelerator pedal opening, deceleration, and energy recovery intensity.

5. The vehicle energy recovery intensity evaluation method according to any one of claims 1 to 3, characterized in that: In step S1, the step of determining whether the vehicle enters the energy recovery phase according to the driving parameters includes: S101: Determining whether the vehicle speed is within a preset energy recovery speed range; If yes, proceed to step 102; If not, continue to obtain the vehicle speed; S102: Determining whether the accelerator pedal opening is less than a preset accelerator pedal opening threshold; If yes, proceed to step S2; If not, continue to obtain the vehicle speed.

6. The vehicle energy recovery intensity evaluation method according to claim 5, characterized in that: The preset energy recovery speed range is: 8km / h-180km / h, and the preset accelerator pedal opening threshold is 5%.

7. The vehicle energy recovery intensity evaluation method according to any one of claims 1 to 3, characterized in that: The deceleration is calculated according to the following formula: Where a is the vehicle deceleration in m / s 2 ; M is the vehicle weight, in kg; F v is the vehicle's driving resistance, in N; Tmotor is the torque of the motor's energy recovery, in Nm; i is the vehicle's main reducer speed ratio; r is the wheel's rolling radius, in m.

8. The vehicle energy recovery intensity evaluation method according to claim 7, characterized in that: The vehicle weight is obtained each time the vehicle is started, and the steps of obtaining the vehicle weight include: The weights of the vehicle at the left front, right front, left rear, and right rear positions are collected respectively, and the sum of the weights at the four positions and the unsprung mass of the vehicle is calculated to obtain the vehicle weight.

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