Pure electric commercial vehicle cruising method based on three states

Abstract

The invention discloses a three-state-based cruise method for a pure electric commercial vehicle, which comprises the following steps of: vehicle state self-inspection: judging the state of the vehicle in a vehicle driving process so as to judge whether the vehicle can continue to run or not; driver state detection: collecting a life temperature signal of the driver, starting a driver observation system after determining that the vital signs are correct, and determining that the mental state of the driver meets a cruise starting condition; judging or selecting a driving condition to select a cruise mode; according to the self-adjusting cruise mode, the vehicle can be automatically matched and call the corresponding cruise mode to run by collecting the conditions of the vehicle state, the driver state and the running working condition. According to the cruising method, the cruising safety can be improved, the driving operability is optimized, and the driving safety of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial vehicle cruising, and in particular to a three-state cruising method for a pure electric commercial vehicle. Background Art

[0002] When commercial vehicles are used for a long time, drivers will encounter a series of problems during driving. This is mainly because the use of commercial vehicles is commercial in nature, so many drivers will work for a long time and experience fatigue driving. During fatigue driving, the driver's attention will continue to decline, resulting in the vehicle failing to promptly detect and take corresponding measures when safety hazards such as worn and damaged parts occur; and in the face of different driving conditions, the driver's required speed is different, so a single cruise strategy cannot respond well to the driver's signal; at the same time, because of the driver's fatigue driving, the driver cannot make the best judgment and take countermeasures to change the speed, resulting in a series of vehicle traffic failures.

[0003] Existing commercial vehicle cruise control requires manual intervention from the driver to enter or exit the cruise mode. Therefore, there are certain requirements for the driver's operability and driver status, and the commercial nature of the commercial vehicle itself is not fully reflected. In addition, the existing cruise control can only cruise at a specified speed, and safety cannot be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to provide a three-state cruise method for a pure electric commercial vehicle, which is used to solve the technical problems in the prior art that commercial vehicle cruising requires human intervention from the driver and that cruising can only be performed at a specified speed, resulting in poor cruising effect.

[0005] The present invention solves the above problems through the following technical solutions:

[0006] A three-state cruise method for a pure electric commercial vehicle includes the following specific steps:

[0007] Step A: Self-checking the vehicle status: During the driving process, the vehicle status is judged to determine whether the vehicle can continue to drive;

[0008] Whether the vehicle can continue to drive requires judging the following aspects and drawing corresponding conclusions:

[0009] A1.1. Vehicle cruise software status detection to determine whether the vehicle software self-detection before driving reports an error;

[0010] A1.2. Vehicle driving hardware status detection: Detect the status of the hardware equipment, the control system of the hardware equipment, and the rear trailer of the semi-trailer during the vehicle driving process to determine whether the cruising standard can be met;

[0011] Step B, driver status detection: Collect the driver's vital temperature signal, and start the driver observation system after confirming that the vital characteristics are correct, and confirm that the driver's mental state has no obvious sleep state and no obvious change in complexion, which meets the cruise start condition;

[0012] Step C, judging or selecting the driving condition to select the cruise mode: the driving condition is complicated during driving, and the selection of the driving condition is made by the driver or by the cruise system positioning judgment using the Beidou positioning system; the driving condition includes but is not limited to: high-speed long-distance condition, special mineral working condition, port condition and national highway urban condition;

[0013] Step D, self-adjusting cruise mode: by collecting the status of the vehicle, the driver and the driving condition, the vehicle can automatically match and call the corresponding cruise mode for driving; the cruise modes include but are not limited to: "0" cruise mode, high-speed long-distance mode, multi-condition coordination mode, and composite mode,

[0014] Among them, the "0" cruise mode is used when encountering unexpected situations and the vehicle urgently needs to slow down steadily, and it is started actively or passively; the high-speed long-distance mode is suitable for high-speed and long-distance working conditions; the multi-condition coordination mode and the composite mode can be switched freely, and are both suitable for special mineral working conditions and port conditions. The composite mode can also be suitable for national highway urban conditions.

[0015] As a further improvement of the present invention, in step A, it is determined whether the vehicle can continue to travel. If so, it continues to travel, and the range of the vehicle's driving speed is determined; if not, the vehicle automatically turns on the double flash and enters the "0" cruise mode to ensure the safety of the driver and the vehicle.

[0016] As a further improvement of the present invention, in step A, the vehicle cruise software status detection is performed to determine whether the vehicle software self-detection before driving has an error; the specific method includes:

[0017] Check the cab's emergency alarm device to see if it can continue to open without any obstacles in seconds;

[0018] Conduct communication diagnosis on the electronic control program to determine whether there is an error;

[0019] The driver status processing of the driver observation system is regarded as a software status, so it is necessary to judge whether the driver status processing process of the driver observation system reports an error.

[0020] As a further improvement of the present invention, in step B, after the cruise is turned on, the driver's vital signs and mental state are continuously detected to ensure that the driver's state judgment result is correct.

[0021] As a further improvement of the present invention, the step B further includes: adjusting the cruising safety speed limit within 50% according to the driver's state;

[0022] Among them, the cruising safety speed limit is reduced by 10% when entering mild fatigue driving, the cruising safety speed limit is reduced by 30% when entering moderate fatigue driving, and the cruising safety speed limit is reduced by 50% when entering severe fatigue driving.

[0023] As a further improvement of the present invention, in step B, the method for determining fatigue driving is:

[0024] First, the driver's facial information is collected, and the driver's normal driving status data is collected. Then the driver's eye closure status and facial feature status are collected, and the aspect ratio of the driver's eyes and mouth corners is collected and analyzed. Since each person's aspect ratio is different, the decrease in the aspect ratio is used to determine: when the aspect ratio decreases by more than 20% of the normal state, it is determined as a mild item; if the driver closes his eyes for more than 3s, it is also determined as a mild item;

[0025] The driver's mouth corners are also analyzed for aspect ratio. If it is greater than 30% of the normal state, it is judged as mild. If the mouth corner aspect ratio is greater than 30% of the normal state twice or more within one minute, it is judged as mild. The driver's blinking frequency is analyzed. The normal blinking frequency is 15-20 times / min. When the driver's frequency is greater than 20 times / min, it is judged as mild.

[0026] When one item is judged as mild, it is mild fatigue driving; when there are two items, it is moderate fatigue driving; when there are more than two items, it is severe fatigue driving.

[0027] As a further improvement of the present invention, the calculation formula of the aspect ratio is:

[0028] Among them, P1 is the leftmost point data of the eye or corner of the mouth; P2 is the upper 1 / 3 point data of the eye or corner of the mouth; P3 is the upper 2 / 3 point data of the eye or corner of the mouth; P4 is the leftmost point data of the eye or corner of the mouth; P5 is the lower 2 / 3 point data of the eye or corner of the mouth; P6 is the lower 1 / 3 point data of the eye or corner of the mouth.

[0029] As a further improvement of the present invention, in step D, when the commercial vehicle starts the "0" cruise mode, the tractor and the trailer need to be braked at the same time.

[0030] As a further improvement of the present invention, step D also includes: during the process of the "0" cruise mode reaching 0 km / h, the vehicle can be interrupted at any time and accelerated; and when the vehicle leaves the acceleration range, the "0" cruise mode still exists and continues to start, gradually driving the vehicle to 0 km / h.

[0031] As a further improvement of the present invention, in step D, when the high-speed long-distance cruise mode is selected, a real-time status analysis of the driver is required; if the driver's status does not meet the standard, the driver is reminded and the cruise is exited; if the driver responds, the high-speed long-distance cruise mode is directly exited; if there is no response, the "0" cruise mode is connected; and when the vehicle power is less than 20%, the driver is reminded and the high-speed long-distance cruise mode is directly exited.

[0032] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0033] The cruising method of the present invention can improve cruising safety, optimize driving operability, and improve vehicle driving safety.

[0034] (1) Improving cruise safety: In particular, the driver's vital characteristics and mental state will directly affect driving safety. When the vehicle is cruising, the present cruise method first performs vehicle status self-checking, driver status detection, and driving condition judgment or selection to perform three-state detection and judgment, so as to avoid a series of safety problems caused by directly entering the cruise mode; and while performing a driving status safety analysis on the driver, an effective algorithm is used to control whether the driver can grasp the current cruise, and the vehicle can be safely stopped at a certain time when cruising at high speed, thereby improving the cruise safety by adding a "0" cruise mode in the cruise mode;

[0035] (2) Optimizing driving operability: The cruise mode classification realizes the differentiation of cruise modes. According to the vehicle speed and power requirements under different driving conditions, the driver's workload is well optimized, freeing up time for the driver to better drive. In addition, the vehicle's dynamic performance is appropriately regulated under different cruise modes, optimizing the effective use of vehicle energy.

[0036] (3) Improve vehicle driving safety: As for the overall vehicle safety, the vehicle’s three-state self-collection optimizes driving judgment and takes necessary precautions against some possible accidents, allowing the vehicle to avoid accidents or prevent them in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of a three-state cruising method for a pure electric commercial vehicle according to the present invention;

[0038] Figure 2 It is a schematic diagram of the positions of various points in the aspect ratio calculation of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0040] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0041] In the description of the present application, it should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or display comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or displays.

[0042] The following will be combined Figure 1-2 , a three-state cruise method based on a pure electric commercial vehicle involved in the embodiment of the present application is described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0043] Example

[0044] Combined with Figure 1 As shown, a three-state cruise method for a pure electric commercial vehicle includes the following steps:

[0045] A. Vehicle status self-check: During the driving process, the vehicle status is judged to determine whether the vehicle can continue to drive;

[0046] The vehicle self-check needs to be carried out through the communication line, and the new energy commercial vehicle itself has a communication line. Therefore, the vehicle communication information is used to determine whether the vehicle can continue to drive after the vehicle status self-check; if it can, it will continue to drive and determine the driving speed range to achieve the best driving; if it cannot, the vehicle will automatically turn on the double flash and enter the "0 cruise mode" to ensure the safety of the driver and the vehicle.

[0047] In determining whether the vehicle can continue to drive, it is necessary to make judgments from the following aspects and draw corresponding conclusions;

[0048] A1.1. Vehicle cruise software status detection to determine whether the vehicle software self-detection before driving has an error; for example: whether the VCU program or MCU program causes the MCU or VCU to report an error, etc.;

[0049] Check whether the alarm emergency device in the cab can continue to open without obstacles in seconds. The same communication diagnosis should be performed on the communication of other electronic control programs to determine whether there is an error. The driver status processing of the driver observation system on the cab panel is regarded as a software state in this method, so it is necessary to determine whether the driver status processing of the driver observation system is an error. Check whether the navigation logo on the panel can be used normally according to the needs, and whether it can meet the cruise change standards. The expression of the logo change on the panel during the cruise process should be accurate and rapid, so that the driver can receive the information at the first time to make corresponding judgments and follow-up work. For changes in the cruise process, if the corresponding problems are detected, they should be communicated to the self-adjusting cruise module, so that the vehicle can reach the corresponding state.

[0050] A1.2. Vehicle driving hardware status detection

[0051] The status of hardware equipment, control systems of hardware equipment, and the rear trailer of the semi-trailer are queried during the driving process of the vehicle; for example: hardware equipment such as motors, batteries, and electronic controls, and sensors are used to detect the existing status of control systems of hardware equipment such as tires, transmission systems, steering systems, and brake systems, etc., and whether there are any abnormalities under communication detection; and for the rear trailer of the semi-trailer, there should be a same sensor communication detection for its brake system to determine whether the rear trailer is safe and whether it can meet the cruising standard.

[0052] B. Driver status detection: Collect the driver's vital temperature signal, and start the driver observation system after confirming that the vital characteristics are correct. It is determined that the driver's mental state does not show obvious sleepiness or obvious changes in complexion, which meets the cruise start conditions;

[0053] Preferably, after the cruise control is turned on, the driver's vital signs and mental state are continuously detected to ensure that the initial judgment result of the driver's state is correct.

[0054] Specifically, when the driver enters the cab, the temperature sensor of the driver's seat should start measuring the driver's vital temperature signal. After confirming that the vital signs are correct, the driver observation system is started to determine that the driver's mental state, that is, no obvious sleep state, no obvious change in complexion, etc., meets the cruise start conditions; after the cruise is turned on, the driver's vital signs and mental state are tested to ensure that the test and judgment results of the temperature sensor and the driver observation system are correct, and re-judge whether the driver's current state can meet the requirements for cruise start. The design of this application function mainly arranges module equipment in the driver's seat and its related equipment to achieve the driver's state analysis.

[0055] However, the driver's status varies from person to person, and corresponding adjustments need to be made based on the AI ​​algorithm calculations collected from the driver's simple living habits. The cruise safety speed limit is adjusted according to the driver's status. This adjustment only applies to adjustments within 50% of the cruise safety speed limit. For example: when entering a state of mild fatigue driving, the cruise safety speed limit is reduced by 10%; when entering a state of moderate fatigue driving, the cruise safety speed limit is reduced by 30%; when entering a state of severe fatigue driving, the cruise safety speed limit is reduced by 50%.

[0056] Combined with Figure 2 As shown in the figure, the method for determining fatigue driving is:

[0057] First, the driver's facial information is collected, and the data of the driver's normal driving status is collected. Then the driver's eye closure status and facial feature status are collected, and then the aspect ratio of the driver's eyes and mouth corners is collected and analyzed. Since each person's aspect ratio is different, the decrease in the aspect ratio is used to determine: when the aspect ratio decreases by more than 20% of the normal state, it is determined as a mild item; if the driver closes his eyes for more than 3s, it is also determined as a mild item; the driver's mouth corners are also analyzed for aspect ratio. If it is greater than 30% of the normal state, it is determined as a mild item; if the aspect ratio of the mouth corner is greater than 30% of the normal state twice or more within one minute, it is also determined as a mild item; the driver's blinking frequency is analyzed. The normal blinking frequency is 15-20 times / min. When the driver's frequency is greater than 20 times / min, it is determined as a mild item; when one of the items is present, it is mild fatigue driving, two are moderate fatigue driving, and more than two are severe driving fatigue. Among them, the calculation formula of the aspect ratio is:

[0058] Among them, P1 is the leftmost point data of the eye or corner of the mouth; P2 is the upper 1 / 3 point data of the eye or corner of the mouth; P3 is the upper 2 / 3 point data of the eye or corner of the mouth; P4 is the leftmost point data of the eye or corner of the mouth; P5 is the lower 2 / 3 point data of the eye or corner of the mouth; P6 is the lower 1 / 3 point data of the eye or corner of the mouth.

[0059] C. Driving condition judgment or selection to select cruise mode:

[0060] The driving conditions are complicated during driving. The driver can choose the driving conditions by himself, or the Beidou positioning system can be used to determine the positioning by the cruise system. The driving conditions are divided into the following categories:

[0061] C3.1, high-speed long-distance operation

[0062] This working condition is regarded as a working condition that requires continuous driving on a long-distance highway for a long time. The range of cruising speed control is the widest, and the speed requirements that need to be met at this time are extensive. Therefore, the speed range here is given to a working speed of 30-90km / h, that is, only when it reaches 30km / h to 90km / h can you have the right to enter the cruise mode. In this area of ​​the cruising speed range, the driver can adjust the speed; however, in terms of the driver's state requirements, this working condition has the highest requirements, and in this cruise, the braking system at high speed has the ability to regulate. For the cruise requirements that cannot be met, the cruise module has the right to reduce the speed, and the electronic brake system of the trailer will also be started simultaneously, which can greatly reduce the speed safely and effectively, and also provide a certain degree of support for the driver's reaction time;

[0063] C3.2 Special mineral working conditions

[0064] For working conditions that require handling of minerals in mineral areas and special environments, the cruise mode is 10-40km / h under these working conditions. In the mineral area, there are multiple sensors in the cargo box or trailer to detect whether the cargo equipment meets the loading range required by the cruise. When this requirement is met, the cruise mode can be entered. When the requirement is not met, the cruise mode is directly exited and the driver is reminded.

[0065] C3.3, Port conditions

[0066] The transportation of port cargo requires vehicles to operate at high load, so the demand for cruising may be standard. Because the demand and standard for cruising exist, it requires the driver's regulation, but to a certain extent it also facilitates the driver and improves driving quality.

[0067] C3.4, National highway urban conditions

[0068] For national highways in urban areas, what vehicles need at this time is not high-speed cruising, but the power and energy saving through endurance.

[0069] D. Self-adjusting cruise mode

[0070] In the adjustment of the cruise module, the vehicle status, driver status and driving condition are first collected. At this time, the self-adjusting cruise module can call which cruise mode. The self-adjusting cruise module is divided into the following modes: "0" cruise mode, high-speed long-distance mode, multi-condition coordination mode, and composite mode;

[0071] "0" cruise mode: This mode does not exist in the modes that can be called during normal driving. This mode is used when other cruise modes encounter unexpected situations. When the vehicle urgently needs to slow down steadily, this mode will be started actively or passively. Because the corresponding situations are different for emergencies, the degree of need varies. In the braking of commercial vehicles, the tractor and trailer are more often braked at the same time. Only then can the safety of the vehicle be guaranteed, and the vehicle can be gradually out of danger and reach a safe state. Due to the complexity of environmental conditions, braking is not the optimal solution to escape danger in many cases. Therefore, in the process of 0km / h in the "0" cruise mode, it can be interrupted at any time and the vehicle can be accelerated. However, after the vehicle leaves the acceleration range, the "0" cruise mode still exists and continues to start, gradually driving the vehicle to 0km / h.

[0072] High-speed long-distance cruise mode: Applicable to high-power, high-speed, high-detection, and high-risk conditions. This mode is applied to high-speed or long-distance conditions. During the long-term high-speed driving of commercial vehicles, frequent and persistent accelerator pedaling will increase the driver's workload, so high-speed cruise is necessary. However, the observation of the driver's status during long-term high-speed travel requires a real-time status analysis; if the driver's status does not meet the standard, the driver will be reminded and the cruise will be exited; if the driver responds, the high-speed long-distance cruise mode will be directly exited; if there is no response, the "0" cruise mode will be connected; and when the vehicle's battery power is less than 20%, the driver will be reminded to directly exit the high-speed long-distance cruise mode;

[0073] Multi-operating-condition coordination mode: Applicable to low power, low speed, high detection and high risk. The purpose of commercial vehicles is transportation. Some commercial vehicles run multiple times under different operating conditions. Therefore, the driver switches between different environments, but there is no speed and high power requirement. Therefore, for this mode, the motor and its corresponding speed and other conditions can be restricted. Under the premise of not affecting work efficiency, the vehicle can be kept in a low-energy cruising state. The multi-operating-condition coordination mode is superior to the low-power mode and also provides cruising convenience;

[0074] Compound mode: suitable for high power, low speed, low detection and low risk. This mode is suitable for compound working conditions, such as vehicles that need power but also need to cruise at low speed in ports. And the requirement of this mode is that cruising reduces the workload of the driver, so the requirements for this cruise mode are not high.

[0075] Among them, the multi-condition coordination mode and the composite mode can be switched freely, both of which are applicable to special mineral working conditions and port conditions. The composite mode can also be applicable to national highway and urban conditions.

[0076] The cruising method of the present invention can improve cruising safety, optimize driving operability, and improve vehicle driving safety.

[0077] 1. Improve cruise safety: When the vehicle is cruising, firstly perform vehicle status self-check, driver status detection, and driving condition judgment or select to perform three-state detection and judgment, to avoid a series of safety problems caused by directly entering the cruise mode, and improve cruise safety by adding the "0" cruise mode in the cruise mode;

[0078] 2. Optimize driving operability: Different cruise modes are designed to optimize the driver's workload according to the vehicle speed and power requirements under different driving conditions, freeing up time for the driver to better drive.

[0079] 3. Improve vehicle driving safety: For the overall vehicle safety, the vehicle's three-state self-collection optimizes driving judgment, and takes necessary precautions against some possible accidents, allowing the vehicle to avoid or prevent accidents in advance.

[0080] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are only preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A three-state cruise method for a pure electric commercial vehicle, characterized in that: include: Step A: Self-checking the vehicle status: During the driving process, the vehicle status is judged to determine whether the vehicle can continue to drive; Whether the vehicle can continue to drive requires judging the following aspects and drawing corresponding conclusions: A1.

1. Vehicle cruise software status detection to determine whether the vehicle software self-detection before driving reports an error; A1.

2. Vehicle driving hardware status detection: Detect the status of the hardware equipment, the control system of the hardware equipment, and the rear trailer of the semi-trailer during the vehicle driving process to determine whether the cruising standard can be met; Step B, driver status detection: Collect the driver's vital temperature signal, and start the driver observation system after confirming that the vital characteristics are correct, and confirm that the driver's mental state has no obvious sleep state and no obvious change in complexion, which meets the cruise start condition; Step C, judging or selecting the driving condition to select the cruise mode: the driving condition is complicated during driving, and the selection of the driving condition is made by the driver or by the cruise system positioning judgment using the Beidou positioning system; the driving condition includes but is not limited to: high-speed long-distance condition, special mineral working condition, port condition and national highway urban condition; Step D, self-adjusting cruise mode: by collecting the status of the vehicle, the driver and the driving condition, the vehicle can automatically match and call the corresponding cruise mode for driving; the cruise modes include but are not limited to: "0" cruise mode, high-speed long-distance mode, multi-condition coordination mode, and composite mode, Among them, the "0" cruise mode is used when encountering unexpected situations and the vehicle urgently needs to slow down steadily, and it is started actively or passively; the high-speed long-distance mode is suitable for high-speed and long-distance working conditions; the multi-condition coordination mode and the composite mode can be switched freely, and are both suitable for special mineral working conditions and port conditions. The composite mode can also be suitable for national highway urban conditions.

2. A three-state cruise method for a pure electric commercial vehicle according to claim 1, characterized in that: In step A, it is determined whether the vehicle can continue to travel. If so, it continues to travel, and the range of the vehicle's driving speed is determined; if not, the vehicle automatically turns on the double flash and enters the "0" cruise mode to ensure the safety of the driver and the vehicle.

3. A three-state cruise method for a pure electric commercial vehicle according to claim 1, characterized in that: In step A, the vehicle cruise software status is detected to determine whether the vehicle software self-detection before driving has an error; the specific method includes: Check the cab's emergency alarm device to see if it can continue to open without any obstacles in seconds; Conduct communication diagnosis on the electronic control program to determine whether there is an error; The driver status processing of the driver observation system is regarded as a software status, so it is necessary to judge whether the driver status processing process of the driver observation system reports an error.

4. A three-state cruise method for a pure electric commercial vehicle according to claim 1, characterized in that: In step B, after the cruise control is turned on, the driver's vital signs and mental state are continuously detected to ensure that the driver's state judgment result is correct.

5. A three-state cruise method for a pure electric commercial vehicle according to claim 4, characterized in that: The step B also includes: adjusting the cruising safety speed limit within 50% according to the driver's state; Among them, the cruising safety speed limit is reduced by 10% when entering mild fatigue driving, the cruising safety speed limit is reduced by 30% when entering moderate fatigue driving, and the cruising safety speed limit is reduced by 50% when entering severe fatigue driving.

6. A three-state cruise method for a pure electric commercial vehicle according to claim 5, characterized in that: In step B, the method for determining fatigue driving is: First, the driver's facial information is collected, and the data of the driver's normal driving state is collected. Then the driver's eye closure state and facial feature state are collected, and the aspect ratio of the driver's eyes and mouth corners is collected and analyzed. Since each person's aspect ratio is different, the decrease in the aspect ratio is used to determine: when the aspect ratio decreases by more than 20% of the normal state, it is determined as a mild item; if the driver closes his eyes for more than 3s, it is also determined as a mild item; The driver's mouth corners are also analyzed for aspect ratio. If it is greater than 30% of the normal state, it is judged as mild. If the mouth corner aspect ratio is greater than 30% of the normal state twice or more within one minute, it is judged as mild. The driver's blinking frequency is analyzed. The normal blinking frequency is 15-20 times / min. When the driver's frequency is greater than 20 times / min, it is judged as mild. When one item is judged as mild, it is mild fatigue driving; when there are two items, it is moderate fatigue driving; when there are more than two items, it is severe fatigue driving.

7. A three-state cruise method for a pure electric commercial vehicle according to claim 6, characterized in that: The aspect ratio is calculated as: Among them, P1 is the leftmost point data of the eye or corner of the mouth; P2 is the upper 1 / 3 point data of the eye or corner of the mouth; P3 is the upper 2 / 3 point data of the eye or corner of the mouth; P4 is the leftmost point data of the eye or corner of the mouth; P5 is the lower 2 / 3 point data of the eye or corner of the mouth; P6 is the lower 1 / 3 point data of the eye or corner of the mouth.

8. A three-state cruise method for a pure electric commercial vehicle according to any one of claims 1 to 7, characterized in that: In step D, when the commercial vehicle starts the "0" cruise mode, the tractor and the trailer need to be braked at the same time.

9. A three-state cruise method for a pure electric commercial vehicle according to claim 8, characterized in that: The step D also includes: during the process of the "0" cruise mode reaching 0 km / h, the vehicle can be interrupted at any time and accelerated; and when the vehicle leaves the acceleration range, the "0" cruise mode still exists and continues to be started, and the vehicle is gradually driven to 0 km / h.

10. A three-state cruise method for a pure electric commercial vehicle according to any one of claims 1 to 7, characterized in that: In step D, when the high-speed long-distance cruise mode is selected, the driver's status needs to be analyzed in real time; if the driver's status does not meet the standard, the driver is reminded and the cruise is exited; If the driver responds, the high-speed long-distance cruise mode will be exited directly; If there is no response, the "0" cruise mode will be engaged; and when the vehicle battery level is less than 20%, the driver will be reminded and the high-speed long-distance cruise mode will be directly exited.

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