A vehicle driving mode intelligent control method and system

Abstract

The present invention relates to the field of vehicle driving control technology, and specifically to a whole vehicle driving mode intelligent control method and system. The driving mode switch of the present invention does not directly output a driving mode signal, but continuously adjusts multiple parameters to control the torque output of the vehicle. Through this control method, a variety of driving modes can be smoothly switched, which solves the limitation of only a few fixed driving modes at present, and greatly meets the personalized driving needs of users; the control method of the present invention includes two control strategies: custom mode and intelligent mode. The custom mode requires the user to operate the driving mode main switch to select the custom mode, and then operate the driving mode sub-switch to switch the driving mode; the intelligent mode requires the user to operate the driving mode main switch to select the intelligent mode, and the user does not need to operate the driving mode sub-switch. The vehicle intelligently switches the driving mode according to its own operating state and road conditions to achieve appropriate torque output, thereby improving the driving experience of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle driving control, and in particular to a whole vehicle driving mode intelligent control method and system. Background Art

[0002] As vehicles become more and more popular, young people have higher and higher demands for personalized vehicles, especially personalized driving performance. Although most vehicles currently provide three driving modes: energy saving (EHo), comfort (Normal) and sports (Sport), for most users, these three modes are difficult to accurately match their actual needs and they cannot experience personalized driving pleasure.

[0003] Intelligent driving mode control can solve this problem well to meet the driving needs of different groups of people. However, the existing intelligent driving mode control methods usually rely on cloud servers and Internet of Things technology, or need to collect a large amount of driving experience of excellent drivers, have high requirements for the vehicle networking environment, and may have the risk of delay or unavailability in environments with poor or no network. In addition, the control cost is high, making it difficult to apply to actual mass-produced vehicles. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a method and system for intelligent control of the driving mode of a whole vehicle is provided, which can intelligently match the appropriate driving mode and support driving mode customization, thereby meeting the user's personalized driving needs to the greatest extent.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A vehicle driving mode intelligent control method mainly includes the following steps:

[0007] S1, obtaining the current main driving mode category, if it is a custom mode, executing step S2, if it is a smart mode, executing step S3;

[0008] S2, obtaining the current sub-driving mode category, determining the torque distribution parameter k and the torque filter parameter r according to the sub-driving mode category, and executing step S6;

[0009] S3, obtaining a vehicle speed signal, a wheel speed signal, a slope signal, a terrain signal and an accelerator pedal signal of the current vehicle;

[0010] S4, determining a slip ratio value H of the current vehicle according to the vehicle speed signal and the wheel speed signal, determining a slope angle value A of the current vehicle according to the slope signal, determining a friction coefficient U of the road surface on which the current vehicle is traveling according to the terrain signal, and determining a throttle opening B and a rate of change of the opening W of the current vehicle according to the throttle pedal signal;

[0011] S5, calculating the torque distribution parameter k and the torque filter parameter r according to the slip ratio value H, the slope angle value A, the road friction coefficient U, the throttle opening B and the opening change rate W, and executing step S6;

[0012] S6, executing a corresponding torque output table according to the torque distribution parameter k, and determining a target output torque corresponding to the current accelerator pedal opening according to the torque output table;

[0013] S7, determining a torque response time corresponding to the target output torque according to the torque filter parameter r;

[0014] S8: Control the torque output value of the vehicle according to the target output torque and the torque response time.

[0015] Among them, the value range of the torque distribution parameter k is 0-1. When k is 1, the strong power torque output table is executed; when k is 0, the weak power torque output table is executed; when k is between 0 and 1, the larger the value of k, the smaller the throttle pedal opening value required to achieve the same target output torque in the executed torque output table; the value range of the torque filtering parameter r is 0-1. When r is 0, torque filtering is not performed; when r is not 0, torque filtering is performed, and the larger the value of r, the longer the torque response time required to achieve the same target output torque.

[0016] Furthermore, in step S1, the main driving mode category is obtained through a driving mode main switch in the vehicle, and the driving mode main switch is provided with two gears of "custom mode" and "intelligent mode".

[0017] Furthermore, in step S2, the sub-driving mode category is obtained through a driving mode sub-switch in the vehicle, and the driving mode sub-switch is provided with a plurality of modes, each mode corresponding to a different torque distribution parameter k and torque filter parameter r.

[0018] Furthermore, in step S4, the slope angle value A is a positive number when the vehicle is in an uphill state, and is a negative number when the vehicle is in a downhill state; the specific method for determining the road friction coefficient U is: first, determine the road condition on which the vehicle is currently traveling according to the terrain signal, and then determine the road friction coefficient U on which the vehicle is currently traveling according to a preset reference table of friction coefficients for various road conditions.

[0019] Furthermore, in step S5, the calculation formulas of the torque distribution parameter k and the torque filtering parameter r are as follows:

[0020] k=A×k 2 +U×k 3 +B×k 4 +W×k5 -H×k 1

[0021] r=H×r 1 -A×r 2 -U×r 3 -B×r 4 -W×r 5

[0022] In the formula, k 1 , k 2 , k 3 , k 4 , k 5 are the torque distribution weight coefficients of slip ratio value H, slope angle value A, road friction coefficient U, throttle opening B and opening change rate W; r 1 、r 2 、r 3 、r 4 、r 5 They are the torque filter weight coefficients of slip ratio value H, slope angle value A, road friction coefficient U, throttle opening B and opening change rate W respectively.

[0023] Furthermore, in step S6, a plurality of torque output tables are provided, and different torque distribution parameters k correspond to different torque output tables, respectively. The torque output table records the target output torque corresponding to each accelerator pedal opening value.

[0024] Based on the same inventive concept, the present application also provides a vehicle driving mode intelligent control system, which mainly includes a driving mode input block, a driving mode control module and a power output module. The driving mode input block is composed of a driving mode input module, a vehicle parameter monitoring module and a road condition recognition module.

[0025] The driving mode input module includes a driving mode main switch and a driving mode sub-switch, which are used to obtain the main driving mode category and the sub-driving mode category of the current vehicle respectively;

[0026] The vehicle parameter monitoring module is used to monitor the vehicle speed signal, wheel speed signal and accelerator pedal signal in real time, and calculate the current vehicle slip rate value according to the vehicle speed signal and wheel speed signal, and determine the current vehicle throttle opening and opening change rate according to the accelerator pedal signal;

[0027] The road condition recognition module is used to monitor the vehicle's slope signal and terrain signal in real time, and determine the current vehicle's uphill and downhill state and slope inclination value according to the slope signal, and determine the road condition on which the vehicle is currently traveling according to the terrain signal;

[0028] The driving mode control module is used to receive the output signal of the driving mode input block, and calculate and determine the torque distribution parameter and torque filtering parameter of the current vehicle;

[0029] The power output module is used to determine the target output torque and torque response time of the current vehicle according to the torque distribution parameter and the torque filter parameter in combination with a preset torque output table.

[0030] Compared with the prior art, the present invention has the following main advantages:

[0031] 1. The present invention provides a new driving mode control method and system. The driving mode switch does not directly output a driving mode signal, but continuously adjusts multiple parameters to control the torque output of the vehicle. This control method can realize smooth switching of multiple driving modes, solves the limitation of only a few fixed driving modes at present, and greatly meets the personalized driving needs of users;

[0032] 2. The control method provided by the present invention includes two control strategies: custom mode and intelligent mode. The custom mode requires the user to operate the driving mode main switch to select the custom mode, and then operate the driving mode sub-switch to switch the driving mode. The intelligent mode requires the user to operate the driving mode main switch to select the intelligent mode, and there is no need for the user to operate the driving mode sub-switch. The vehicle intelligently switches the driving mode according to its own operating status and road conditions to achieve appropriate torque output, thereby improving the driving experience of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Flow chart of the vehicle driving mode intelligent control method in an embodiment of the present invention;

[0034] Figure 2 is a corresponding curve diagram of torque distribution parameters and target output torque in an embodiment of the present invention;

[0035] Figure 3 is a corresponding curve diagram of torque filter parameters and torque response time in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the vehicle driving mode intelligent control system in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0039] Embodiment 1: This embodiment provides a vehicle driving mode intelligent control method, such as Figure 1 As shown, it mainly includes the following steps:

[0040] A vehicle driving mode intelligent control method mainly includes the following steps:

[0041] S1, obtaining the current main driving mode category, if it is a custom mode, executing step S2, if it is a smart mode, executing step S3;

[0042] Among them, the main driving mode category is obtained through a driving mode main switch in the vehicle, and the driving mode main switch has two gears: "custom mode" and "intelligent mode".

[0043] S2, obtaining the current sub-driving mode category, determining the torque distribution parameter k and the torque filter parameter r according to the sub-driving mode category, and executing step S6;

[0044] The sub-driving mode category is obtained through a driving mode sub-switch in the vehicle, and the driving mode sub-switch is provided with a plurality of modes, each mode corresponding to a different torque distribution parameter k and torque filter parameter r.

[0045] S3, obtaining a vehicle speed signal, a wheel speed signal, a slope signal, a terrain signal and an accelerator pedal signal of the current vehicle;

[0046] S4, determining a slip ratio value H of the current vehicle according to the vehicle speed signal and the wheel speed signal, determining a slope angle value A of the current vehicle according to the slope signal, determining a friction coefficient U of the road surface on which the current vehicle is traveling according to the terrain signal, and determining a throttle opening B and a rate of change of the opening W of the current vehicle according to the throttle pedal signal;

[0047] The slope angle value A is a positive number when the vehicle is in an uphill state, and a negative number when the vehicle is in a downhill state;

[0048] The specific method for determining the road friction coefficient U is as follows: firstly, determining the road condition on which the vehicle is currently traveling according to the terrain signal, and then determining the road friction coefficient U on which the vehicle is currently traveling according to a preset reference table of friction coefficients for various road conditions;

[0049] The calculation formulas of the torque distribution parameter k and the torque filtering parameter r are as follows:

[0050] k=A×k 2+U×k 3 +B×k 4 +W×k 5 -H×k 1

[0051] r=H×r 1 -A×r 2 -U×r 3 -B×r 4 -W×r 5

[0052] In the formula, k 1 , k 2 , k 3 , k 4 , k 5 are the torque distribution weight coefficients of slip ratio value H, slope angle value A, road friction coefficient U, throttle opening B and opening change rate W; r 1 、r 2 、r 3 、r 4 、r 5 They are the torque filter weight coefficients of slip ratio value H, slope angle value A, road friction coefficient U, throttle opening B and opening change rate W respectively.

[0053] S5, calculating the torque distribution parameter k and the torque filter parameter r according to the slip ratio value H, the slope angle value A, the road friction coefficient U, the throttle opening B and the opening change rate W, and executing step S6;

[0054] S6, executing a corresponding torque output table according to the torque distribution parameter k, and determining a target output torque corresponding to the current accelerator pedal opening according to the torque output table;

[0055] There are multiple torque output tables, and different torque distribution parameters k correspond to different torque output tables. The torque output table records the target output torque corresponding to each accelerator pedal opening value.

[0056] S7, determining a torque response time corresponding to the target output torque according to the torque filter parameter r;

[0057] S8: Control the torque output value of the vehicle according to the target output torque and the torque response time.

[0058] like Figure 2 As shown, the torque distribution parameter K ranges from 0 to 1. When K is 1, the strong power torque output table is executed; when K is 0, the weak power torque output table is executed; when K is between 0 and 1, the vehicle torque output value is also between the two torque output tables.

[0059] At the same time, when the K value is larger, the output torque value changes faster, and the maximum torque value is reached faster. The accelerator pedal opening value corresponding to the maximum torque value is also smaller, and the power is stronger. The user only needs to step on the accelerator slightly to output a large torque, which improves the vehicle's starting, acceleration, and overtaking performance.

[0060] like Figure 3 As shown, the torque filter parameter r ranges from 0 to 1. When r is 0, no torque filtering is performed; when r is not 0, torque filtering is performed.

[0061] At the same time, as the r value increases, the torque filter strength increases, the responsiveness of the output torque becomes worse but the smoothness becomes better. The r value does not affect the torque output value under the same throttle, but only adjusts the torque change process. As can be seen from the figure, as the r value increases, it takes longer to reach the same output torque. When the r value is large, after the user presses the throttle, he will feel that the power output increases slowly but the acceleration smoothness will be better.

[0062] Furthermore, when the user operates the driving mode main switch to select the custom mode, if the user pursues a dynamic driving experience, the user can choose to adjust the driving mode with a large K value and a small r value. The vehicle torque output value at the same throttle opening will be larger, and the torque response will be very fast, and the acceleration will be very strong; if the user pursues a comfortable driving experience and fuel economy, the user can choose to adjust the driving mode with a small K value and a large r value. The vehicle torque output value at the same throttle opening will be lower, and the torque response will be slower, and the acceleration will be weaker.

[0063] Furthermore, when the user operates the driving mode main switch to select the intelligent mode, the driving mode sub-switch no longer controls the driving mode, and the vehicle intelligently selects the driving mode according to its own operating status and road conditions to adjust the vehicle's torque output. The intelligent mode function of the vehicle driving mode requires accelerator pedal signal, vehicle speed signal, wheel speed signal, slope signal, and multi-terrain signal. The throttle opening and opening change rate are calculated according to the accelerator pedal signal, and the vehicle slip rate is calculated according to the vehicle speed signal and wheel speed signal. When calculating the torque distribution parameters and torque filter parameters, the vehicle slip rate is first determined. The larger the slip rate, the higher the risk of vehicle skidding. When the slip rate is greater than a certain value, the vehicle's grip will drop sharply, affecting the vehicle's driving stability and safety. When the slip rate is greater than a certain value, the intelligent selection of the driving mode reduces the K value and increases the r value, reducing the torque output value at the same throttle opening, and reducing the slip rate to a reasonable level. Secondly, the slope, road conditions and accelerator pedal signal are judged. When going uphill, the required torque is large, and the intelligent driving mode is selected to increase the K value and reduce the r value, thereby increasing the torque output value at the same throttle opening. The selection for downhill is just the opposite; when the vehicle is on a road condition with a large friction coefficient such as rock or sand, the intelligent driving mode is selected to increase the K value and reduce the r value, thereby increasing the torque output value at the same throttle opening; when the vehicle is on a road condition with a small friction coefficient such as snow or mud, the intelligent driving mode is selected to reduce the K value and increase the r value, thereby reducing the torque output value at the same throttle opening; when the user's throttle opening is large or the throttle opening change rate is large, the intelligent driving mode is selected to increase the K value and reduce the r value, thereby increasing the torque output value at the same throttle opening. After judging the above signals, the appropriate K value and r value are finally output to adjust the torque output value at different throttles to meet the user's driving needs.

[0064] Embodiment 2, based on the same inventive concept, this embodiment also provides a vehicle driving mode intelligent control system, which is used to implement the vehicle driving mode intelligent control method as described above, such as Figure 4 As shown, the control system is composed of a vehicle parameter monitoring module, a road condition recognition module and a driving mode key input module to form a driving mode signal input module, which jointly determine the input signal required for driving mode control.

[0065] The vehicle monitoring module monitors the vehicle speed, wheel speed, accelerator pedal opening and other signals in real time;

[0066] Furthermore, the road condition recognition module determines in real time the basic state of the road surface, whether it is a slope, whether it is rocky, snowy, sandy, muddy, wading or highway conditions, etc.;

[0067] Further, the driving mode button input signal determines whether the current driving mode main switch and sub-switch are pressed, released, faulty, etc.;

[0068] Further, the driving mode control module controls the switching of the driving mode according to the input signal received from the driving mode input block, and calculates the corresponding torque distribution parameter and torque filtering parameter;

[0069] Furthermore, the power output module is used to receive the torque distribution parameter and torque filter parameter signal output by the driving mode control module, and calculate the output torque of the vehicle in combination with the preset torque output table of the vehicle, thereby meeting the user's driving requirements.

[0070] Embodiment 3: This embodiment provides a method and system for intelligently controlling a vehicle driving mode. The control system is provided with a driving mode main switch and a driving mode sub-switch. The main switch selects the driving mode as the intelligent mode or the custom mode, and the driving mode sub-switch controls the switching of the driving mode. This allows users to set the driving mode themselves and also intelligently match the appropriate driving mode according to the vehicle operating status and road conditions.

[0071] The driving mode sub-switch has multiple modes to choose from (theoretically, there can be countless modes). Users can switch driving modes by adjusting the sub-switch, such as a knob, a car screen button, or using voice control, experience the driving feeling under different driving modes, and set a driving mode that satisfies them.

[0072] The vehicle is set with two basic torque output tables, one for strong power output and the other for weak power output. Different driving modes select different torque coefficients and filter coefficients. First, the torque output value is determined by the torque coefficient and the two torque tables, and then the torque response and torque smoothness of the vehicle are adjusted by the filter coefficient to achieve different driving experiences.

[0073] The driving mode sub-switch does not output a specific driving mode, but outputs a continuous digital signal. The torque distribution parameters and torque filter parameters are calculated through internal conversion. Based on the preset torque output table, different torque distribution parameters and torque filter parameters determine different torque outputs to achieve different driving experiences.

[0074] Furthermore, the preset torque output tables are not limited to two, and may be one or more.

[0075] Furthermore, the parameters of the driving mode control are not limited to the torque distribution parameter and the torque filter coefficient, but may involve other parameters that affect the driving experience.

[0076] Furthermore, the torque distribution parameter and torque filter coefficient of the driving mode control are not limited to a one-dimensional table, but may be a multi-dimensional table.

[0077] In summary:

[0078] 1. The present invention provides a new driving mode control method and system. The driving mode switch does not directly output a driving mode signal, but continuously adjusts multiple parameters to control the torque output of the vehicle. This control method can realize smooth switching of multiple driving modes, solves the limitation of only a few fixed driving modes at present, and greatly meets the personalized driving needs of users;

[0079] 2. The control method provided by the present invention includes two control strategies: custom mode and intelligent mode. The custom mode requires the user to operate the driving mode main switch to select the custom mode, and then operate the driving mode sub-switch to switch the driving mode. The intelligent mode requires the user to operate the driving mode main switch to select the intelligent mode, and there is no need for the user to operate the driving mode sub-switch. The vehicle intelligently switches the driving mode according to its own operating status and road conditions to achieve appropriate torque output, thereby improving the driving experience of the vehicle.

[0080] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle driving mode intelligent control method, characterized in that: The steps include: S1, obtaining the current main driving mode category, if it is a custom mode, executing step S2, if it is a smart mode, executing step S3; S2, obtaining the current sub-driving mode category, determining the torque distribution parameter k and the torque filter parameter r according to the sub-driving mode category, and executing step S6; S3, obtaining a vehicle speed signal, a wheel speed signal, a slope signal, a terrain signal and an accelerator pedal signal of the current vehicle; S4, determining a slip ratio value H of the current vehicle according to the vehicle speed signal and the wheel speed signal, determining a slope angle value A of the current vehicle according to the slope signal, determining a friction coefficient U of the road surface on which the current vehicle is traveling according to the terrain signal, and determining a throttle opening B and a rate of change of the opening W of the current vehicle according to the throttle pedal signal; S5, calculating the torque distribution parameter k and the torque filter parameter r according to the slip ratio value H, the slope angle value A, the road friction coefficient U, the throttle opening B and the opening change rate W, and executing step S6; S6, executing a corresponding torque output table according to the torque distribution parameter k, and determining a target output torque corresponding to the current accelerator pedal opening according to the torque output table; S7, determining a torque response time corresponding to the target output torque according to the torque filter parameter r; S8, controlling the torque output value of the vehicle according to the target output torque and the torque response time; In step S5, the calculation formulas of the torque distribution parameter k and the torque filtering parameter r are as follows: k=A×k2+U×k3+B×k4+W×k5-H×k1 r=H×r1-A×r2-U×r3-B×r4-W×r5 Wherein, k1, k2, k3, k4, k5 are torque distribution weight coefficients of slip ratio value H, slope angle value A, road friction coefficient U, throttle opening B and opening change rate W respectively; r1, r2, r3, r4, r5 are torque filtering weight coefficients of slip ratio value H, slope angle value A, road friction coefficient U, throttle opening B and opening change rate W respectively.

2. The method for intelligently controlling vehicle driving mode according to claim 1, characterized in that In step S1, the main driving mode category is obtained through a driving mode main switch in the vehicle, and the driving mode main switch is provided with two gears: "custom mode" and "smart mode".

3. The method for intelligently controlling vehicle driving mode according to claim 1, characterized in that In step S2, the sub-driving mode category is obtained through a driving mode sub-switch in the vehicle, and the driving mode sub-switch is provided with a plurality of modes, each mode corresponding to a different torque distribution parameter k and torque filter parameter r.

4. The method for intelligently controlling vehicle driving mode according to claim 1, characterized in that In step S4, the slope angle value A is a positive number when the vehicle is in an uphill state, and is a negative number when the vehicle is in a downhill state; the specific method for determining the road friction coefficient U is: first, determine the road condition on which the vehicle is currently traveling according to the terrain signal, and then determine the road friction coefficient U on which the vehicle is currently traveling according to a preset reference table of friction coefficients for various road conditions.

5. The method for intelligently controlling vehicle driving mode according to claim 1 is characterized in that In step S6, there are multiple torque output tables, and different torque distribution parameters k correspond to different torque output tables. The torque output table records the target output torque corresponding to each accelerator pedal opening value.

6. The method for intelligently controlling vehicle driving mode according to claim 5, characterized in that: The torque distribution parameter k has a value range of 0 to 1, and the larger the value of k is, the smaller the accelerator pedal opening value required to achieve the same target output torque in the executed torque output table is.

7. The method for intelligently controlling vehicle driving mode according to claim 1 is characterized in that In step S7, the value range of the torque filter parameter r is 0-1, and the larger the value of r is, the longer the torque response time required to achieve the same target output torque.

8. An intelligent control system for vehicle driving mode, used to implement the control method according to any one of claims 1 to 7, characterized in that: It includes a driving mode input module, a driving mode control module and a power output module. The driving mode input module is composed of a driving mode input module, a vehicle parameter monitoring module and a road condition recognition module. The driving mode input module includes a driving mode main switch and a driving mode sub-switch, which are respectively used to obtain the main driving mode category and the sub-driving mode category of the current vehicle; The vehicle parameter monitoring module is used to monitor the vehicle speed signal, wheel speed signal and accelerator pedal signal in real time, and calculate the current vehicle slip rate value according to the vehicle speed signal and wheel speed signal, and determine the current vehicle throttle opening and opening change rate according to the accelerator pedal signal; The road condition recognition module is used to monitor the vehicle's slope signal and terrain signal in real time, and determine the current vehicle's uphill and downhill state and slope inclination value according to the slope signal, and determine the road condition on which the vehicle is currently traveling according to the terrain signal; The driving mode control module is used to receive the output signal of the driving mode input block, and calculate and determine the torque distribution parameter and torque filtering parameter of the current vehicle; The power output module is used to determine the target output torque and torque response time of the current vehicle according to the torque distribution parameter and the torque filter parameter in combination with a preset torque output table.

9. The vehicle driving mode intelligent control system according to claim 8, characterized in that: The driving mode control module runs a driving mode control program, and the driving mode control module implements the control method according to any one of claims 1 to 7 when running the program.

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