A pure electric commercial vehicle based on three-state cruise method

Abstract

The application discloses a kind of pure electric commercial vehicle based on three-state cruise method, comprising: vehicle state self-checking: in the process of vehicle driving, the state of vehicle itself is judged, to judge whether vehicle can continue to drive;Driver state detection: collect the life temperature signal of driver, determine the life characteristics are correct after starting driver observation system, determine the mental state of driver meets the cruise opening condition;Driving condition judgment or selection, to select cruise mode;Self-regulating cruise mode: through the condition collection of vehicle state, driver state and driving condition three states, vehicle can automatically match and call corresponding cruise mode driving.The cruise method of the application can improve the safety of cruise, optimize the drivability, and improve the safety of vehicle driving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of commercial vehicle cruise, in particular to a three-state cruise method for pure electric commercial vehicle. BACKGROUND

[0002] During the long-time use of the commercial vehicle, a series of problems will occur in the driving process of the driver, mainly because the use of the commercial vehicle itself is of commercial nature, so many drivers will work for a long time and thus fatigue driving occurs. During the fatigue driving, the driver's attention will continue to decline, thus causing the vehicle to not be able to find and take corresponding measures in time when the vehicle appears damage to the parts and other safety hazards; and in the face of different driving link working conditions, the speed required by the driver is different, therefore, a single cruise strategy cannot well respond to the signals of the driver; at the same time, because of the fatigue driving of the driver, the driver cannot make the best judgment to change the speed, thus causing a series of vehicle traffic failures.

[0003] The existing commercial vehicle cruise needs the driver to intervene artificially to enter or exit the cruise mode, therefore, the operability of the driver and the state of the driver need to have certain requirements, and the commercial nature of the commercial vehicle itself has not been fully reflected, in addition, the existing cruise can only cruise at a specified speed, and the safety cannot be guaranteed. SUMMARY

[0004] The present application aims to provide a three-state cruise method for pure electric commercial vehicle, which is used to solve the technical problems that the existing commercial vehicle cruise needs the driver to intervene artificially and can only cruise at a specified speed, thus causing poor cruise effect.

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

[0006] A three-state cruise method for pure electric commercial vehicle, the specific steps include:

[0007] Step A, vehicle state self-checking: judging the state of the vehicle itself during the driving of the vehicle to determine whether the vehicle can continue to drive;

[0008] The following aspects need to be judged to determine whether the vehicle can continue to drive, and the corresponding conclusions are drawn:

[0009] A1.1, vehicle cruise software state detection, to determine whether the vehicle software self-detection before driving has an error;

[0010] A1.2, vehicle driving hardware state detection; detecting the state of hardware devices, control systems of hardware devices, and the rear trailer part of the semi-trailer during vehicle driving, to determine whether the cruise standard can be reached;

[0011] Step B, driver state detection: collecting the driver's vital temperature signal, determining the vital signs, starting the driver observation system after determining the vital signs, determining the mental state of the driver, and determining whether the cruise opening condition is met without obvious sleep state and without obvious change in complexion;

[0012] Step C, driving condition judgment or selection, to select the cruise mode: the driving condition is complex during driving, and the driver selects or uses the Beidou positioning system to determine the position of the cruise system for selection; the driving condition includes but is not limited to: high-speed long-distance condition, special mineral working condition, port condition, and national highway and urban condition;

[0013] Step D, self-adjusting cruise mode: through the collection of the conditions of vehicle state, driver state and driving condition, the vehicle can automatically match and call the corresponding cruise mode; the cruise mode includes but is 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 a sudden situation occurs, and the vehicle needs to be stabilized and slowed down in an active or passive manner; the high-speed long-distance mode is suitable for high-speed long-distance conditions; the multi-condition coordination mode and the composite mode can be freely switched, and can be applied to special mineral working conditions and port conditions; the composite mode can also be applied to national highway and urban conditions.

[0015] As a further improvement of the present application, in step A, it is determined whether the vehicle can continue to drive, if so, the vehicle continues to drive and determines the range of the vehicle driving speed; 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 application, in step A, the vehicle cruise software state detection is used to determine whether the vehicle software self-detection before driving has an error; the specific method includes:

[0017] Detecting whether the alarm and first-aid device of the cab can continue to be opened without obstacles;

[0018] The communication diagnosis of the electric control program is used to determine whether there is an error;

[0019] The driver state processing of the driver observation system is regarded as a software state, so it is necessary to determine whether the driver state processing of the driver observation system has an error.

[0020] As a further improvement of the present application, 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 state judgment result is correct.

[0021] As a further improvement of the present application, in step B, it further comprises: adjusting the cruise control speed within 50% of the safe speed limit according to the driver state;

[0022] Among them, when entering light fatigue driving, the cruise control speed is lowered by 10%; when entering moderate fatigue driving, the cruise control speed is lowered by 30%; when entering severe fatigue driving, the cruise control speed is lowered by 50%.

[0023] As a further improvement of the present application, 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 state data is collected. Then, the driver's closed eye state and facial feature state are collected, and the driver's eye and mouth aspect ratio are collected and analyzed. Since the aspect ratio of each person is different, the aspect ratio is used to determine that when the aspect ratio decreases by more than 20% of the normal state, it is determined as a light item; and when the driver's eyes are closed for more than 3s, it is also determined as a light item;

[0025] The driver's mouth is also analyzed for aspect ratio. If the aspect ratio decreases by more than 30% of the normal state, it is determined as a light item; if the aspect ratio of the mouth appears more than twice within one minute, it is determined as a light item; the driver's blinking frequency is analyzed, and 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 light item;

[0026] When one item is determined as a light item, it is light fatigue driving; two items are moderate fatigue driving; and more than two items are severe fatigue driving.

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

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

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

[0030] As a further improvement of the present application, in step D, during the process of 0km / h in the "0" cruise mode, the vehicle acceleration process can be interrupted at any time; and when the vehicle leaves the acceleration process, the "0" cruise mode still exists and starts to gradually drive the vehicle to 0km / h.

[0031] As a further improvement of the present application, in step D, when the high-speed long-distance cruise mode is selected, real-time state analysis of the driver is required; if the driver's state is not up to 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 accessed; 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 application has the following advantages and beneficial effects:

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

[0034] (1) Improve cruise safety: In particular, the life characteristics and mental state of the driver directly affect the safety of driving. The present cruise method first performs vehicle state self-check, driver state detection, driving condition judgment or selection for three-state detection and judgment to avoid a series of safety problems caused by directly entering the cruise mode. At the same time, the driving state safety analysis of the driver is performed, and whether the driver can effectively control the current cruise is calculated, and the vehicle can be safely stopped at a certain time during high-speed cruise. The "0" cruise mode in the cruise mode is added to improve the cruise safety.

[0035] (2) Optimize driving operability: The classification of the cruise mode realizes the differentiation of the cruise mode. According to the speed and power requirements under different driving conditions, the workload of the driver is well optimized, and time is saved for better driving operation of the driver. In different cruise modes, the power of the vehicle is properly controlled, and the effective use of vehicle energy is optimized.

[0036] (3) Improve the safety of vehicle driving: The overall vehicle safety is optimized by the three-state self-collection of the vehicle to prevent some possible accidents, so that the vehicle can avoid or prevent accidents in advance. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The flowchart of the present application based on the three-state cruise method for a pure electric commercial vehicle;

[0038] Figure 2 A schematic diagram of the positions of various points in the aspect ratio calculation of the present application. DETAILED DESCRIPTION

[0039] In order to make the objects, 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 with reference to the drawings of the preferred embodiments of the present application. In the drawings, identical or similar reference numerals represent identical or similar components or components having identical or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

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

[0041] In the description of the present application, it should be noted that the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display comprising a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or display.

[0042] The embodiments of the present application will be described in detail below with reference to the drawings. Figures 1-2 A pure electric commercial vehicle based on a three-state cruise method is described in detail in the embodiments of the present application. It should be noted that the following embodiments are used to explain the present application and do not constitute a limitation of the present application.

[0043] EMBODIMENT

[0044] The embodiments of the present application will be described in detail below with reference to the drawings. Figure 1 As shown in the drawings, a pure electric commercial vehicle based on a three-state cruise method comprises the following steps:

[0045] A, vehicle state self-check: during vehicle driving, the state of the vehicle itself is judged to determine whether the vehicle can continue to drive;

[0046] The vehicle self-check needs to be performed through a communication line, and the new energy commercial vehicle itself has a communication line. Therefore, the vehicle communication information is judged by the vehicle state self-check to determine whether the vehicle can continue to drive; if so, the vehicle continues to drive and determines that the driving speed should be ensured within a certain range to achieve optimal driving; 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.

[0047] In the judgment of whether the vehicle can continue to travel is needed from the following multiple aspects to make a judgment, and draw the corresponding conclusion;

[0048] A1.1, vehicle cruise software state detection, to determine whether the vehicle software self-test before driving has an error; For example: VCU program, MCU program whether to cause MCU, VCU error, etc.

[0049] The alarm and first aid device of the cab is detected whether it can continue to open without obstacles. The communication of other electronic control programs should be diagnosed to determine whether there is an error. The driver state processing of the driver observation system in the cab panel is regarded as a software state, so the driver state processing of the driver observation system needs to be judged whether there is an error. The panel navigation mark is marked whether it can be used normally, whether it can reach the cruise change standard, and the expression of the cruise process identification change on the panel should be accurate and rapid, so that the driver can receive the information in the first time and make corresponding judgment and subsequent work. For the change in the cruise process, the corresponding problem should be detected through communication to the self-adjusting cruise module, so as to make corresponding adjustment to make the vehicle reach the corresponding state.

[0050] A1.2, vehicle driving hardware state detection

[0051] For the state of hardware devices, hardware device control systems, and semi-trailer rear trailer parts during vehicle driving process; For example: motor, battery, electronic control and other hardware devices, and use sensors to detect the existing state of hardware device control systems such as tires, transmission system, steering system, brake system, etc. It needs to be detected whether there is an error under communication detection. And for the brake system of the semi-trailer rear trailer, a similar sensor communication detection should be performed to determine whether the rear trailer is safe and whether it can reach the cruise standard.

[0052] B, driver state detection: collect the driver's life temperature signal, determine the life characteristics, start the driver observation system, determine the driver's mental state without obvious sleep state, no obvious change in facial expression, etc. It meets the cruise opening condition;

[0053] As a preferred, after the cruise is started, the driver's life characteristics and the driver's mental state are continuously detected to ensure that the previous driver state judgment result is correct.

[0054] Specifically, when the driver enters the driver's cabin, the temperature sensor of the driver's seat should start measuring the driver's vital temperature signal, and after determining the vital signs are correct, the driver observation system is started to determine the mental state of the driver, i.e., no obvious sleep state, no obvious change in complexion, etc., which meets the cruise opening condition. After the cruise is opened, the driver's vital signs and mental state are detected to ensure that the detection and judgment results of the temperature sensor and the driver observation system are correct, and it is re-judged whether the current state of the driver meets the requirements of the cruise opening. The application function design is mainly to arrange the module equipment of the driver's seat and its related equipment part to achieve the state analysis of the driver.

[0055] However, the driver's state is different for different people, and needs to be adjusted according to the AI algorithm calculation of the simple life habit collection of the driver, and the cruise safety speed limit is adjusted according to the driver's state. This adjustment is only reflected in the adjustment within 50% of the cruise safety speed limit, for example: when entering light fatigue driving, the cruise safety speed limit is lowered by 10%, when entering moderate fatigue driving, the cruise safety speed limit is lowered by 30%, and when entering severe fatigue driving, the cruise safety speed limit is lowered by 50%.

[0056] In combination with the accompanying Figure 2 The method for determining fatigue driving is as follows:

[0057] First, the facial information of the driver is collected, the normal driving state data of the driver is collected, then the closed-eye state and facial feature state of the driver are collected, and then the length-width ratio of the eyes and corners of the mouth of the driver is collected and analyzed. Since the length-width ratio of each person is different, the decline range of the length-width ratio is used to determine: when the length-width ratio decreases by more than 20% of the normal state, it is determined as a light item; if the driver closes his eyes for more than 3s, it is also determined as a light item; the length-width ratio of the corners of the mouth of the driver is also analyzed, if it is greater than 30% of the normal state, it is determined as a light item; if the length-width ratio of the corners of the mouth appears more than twice in one minute, which is greater than 30% of the normal state, it is also determined as a light item; the blinking frequency of the driver is analyzed, the normal blinking frequency is 15-20 times / min, when the frequency of the driver is greater than 20 times / min, it is determined as a light item; when one of them is a light fatigue driving, two of them are a moderate fatigue driving, and more than two of them are a severe fatigue driving. The calculation formula of the length-width ratio is: ;

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

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

[0060] Driving conditions are complex when driving, and the selection of driving conditions can be self-selected by the driver or judged by the cruise system using the Beidou positioning system. Driving conditions are divided into the following categories:

[0061] C3.1. High-speed long-distance condition

[0062] This condition is considered to be a condition that requires continuous driving on a high-speed long-distance highway for a long time. The range of cruise speed needs to be controlled the most widely, and the speed requirement needs to be met widely at this time. Therefore, the working speed range is given to 30-90km / h, that is, the cruise mode has the authority to enter the cruise mode only when the speed reaches 30km / h to 90km / h. The driver can adjust the speed in this cruise speed range; however, the state requirement for the driver is the highest in this condition, and the cruise has the ability to control the brake system at high speed. If the cruise requirement is not met, the cruise module has the right to reduce the speed, and the electric control brake system of the trailer will also be started simultaneously, which can greatly and safely reduce the speed and support the driver's reaction time to a certain extent;

[0063] C3.2. Special mineral working condition

[0064] For the condition of working in mineral areas and special environments, the cruise mode gives a mode of 10-40km / h in this condition, and in the mineral area, there are multiple sensors on the cargo box or trailer to detect whether the cargo equipment meets the loading range of the cruise requirement. When the requirement is met, the cruise mode can be entered, and when the requirement is not met, the cruise mode is directly exited and the driver is reminded;

[0065] C3.3. Port condition

[0066] The transportation of port cargo requires the vehicle to operate at high load, so the cruise requirement may be standard, but the driver needs to control it, but to a certain extent, it also facilitates the driver and improves the driving quality.

[0067] C3.4. National highway and urban condition

[0068] For national highways and urban areas, the vehicle does not need high-speed cruise, but needs to save power for energy saving.

[0069] D. Self-adjusting cruise mode

[0070] In the adjustment of the cruise module, first, the conditions of the vehicle state, the driver state and the driving condition are collected, at this time, which cruise mode can be called by the self-adjusting cruise module, 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 mode that can be called in the normal driving process, this mode is used when other cruise modes suddenly encounter an emergency situation, and the vehicle needs to be stabilized and slowed down, this mode will be actively or passively started, because the emergency situation is different, the degree of need is different, and more for commercial vehicles is to brake the tractor and trailer at the same time, at this time, the safety of the vehicle can be ensured, so that the vehicle gradually leaves the danger and reaches a safe state. Due to the complexity of the environmental conditions, braking is not the best solution to escape danger in many cases, therefore, the process of "0" cruise mode at 0 km / h can be interrupted at any time and the vehicle can be accelerated, but the "0" cruise mode still exists and continues to start when the vehicle is out of the acceleration range, and the vehicle is gradually driven to 0 km / h.

[0072] High-speed long-distance cruise mode: suitable for high-power, high-speed, high-detection, and high-risk conditions. This mode is applied to high-speed or long-distance, i.e. high-speed long-distance conditions, during the process of long-time high-speed driving of commercial vehicles, frequent and persistent acceleration will increase the workload of the driver, high-speed cruise is necessary, but the observation of the state of the driver needs a real-time state analysis during long-term high-speed travel; if the driver's state is not up to 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 accessed; and when the whole vehicle power is less than 20%, the driver is reminded to directly leave the high-speed long-distance cruise mode;

[0073] Multi-condition coordination mode: suitable for low-power, low-speed, high-detection, and high-risk. The use of commercial vehicles is for transportation, some commercial vehicles run multiple times under different conditions, therefore, the driver needs to switch under different environments, but there is no requirement for speed and high power, therefore, the motor and its corresponding speed conditions can be limited in this mode, without affecting the work efficiency, so that the vehicle is in a low-energy consumption cruise state. The multi-condition coordination mode is superior in low-power mode and also provides convenient cruise;

[0074] Composite mode: suitable for high-power, low-speed, low-detection, and low-risk. This mode is suitable for composite conditions, such as vehicles that need power but also need low-speed cruise in ports. The demand of this mode is to reduce the workload of the driver, therefore, the requirement for this cruise mode is not high.

[0075] Among them, the multi-working condition coordination mode and the composite mode can be switched freely, and both can be suitable for special mineral working conditions and port working conditions, and the composite mode can also be suitable for national road urban working conditions.

[0076] The cruise method can improve cruise safety, optimize driving operability, and improve vehicle driving safety.

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

[0078] 2. Optimize driving operability: the cruise mode is different, and the driver workload is optimized for different driving conditions, vehicle speed and power requirements, and time is saved for better driving operation for the driver;

[0079] 3. Improve the safety of vehicle driving: the overall vehicle safety is optimized by the three-state self-collection of the vehicle to optimize the driving judgment, and some possible accidents are prevented, so that the vehicle avoids or prevents accidents in advance.

[0080] Although the present application has been described herein with reference to the explanatory embodiments thereof, the above-described embodiments are merely the preferred embodiments of the present application, and the embodiments of the present application are not limited to the above-described embodiments, and 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 the present application.

Claims

1. A three-state cruise method for pure electric commercial vehicles, characterized in that, include: Step A: Vehicle Status Self-Check: During vehicle operation, assess the vehicle's status to determine whether it can continue driving. To determine whether a vehicle can continue to be driven, the following factors need to be assessed, and a corresponding conclusion drawn: A1.1 Vehicle cruise software status detection to determine whether there are any errors in the vehicle software self-detection before driving; A1.2 Vehicle driving hardware status detection; The status of the hardware equipment, the control system of the hardware equipment, and the rear trailer of the semi-trailer are detected during the vehicle driving process to determine whether the cruise standard can be met. Step B, Driver Status Detection: Collect the driver's vital signs and, after confirming that the vital signs are correct, activate the driver observation system. If the driver's mental state is not obviously asleep or there is no obvious change in complexion, then the cruise control activation conditions are met. Step C, Determining or Selecting Driving Conditions for Cruise Mode Selection: Driving conditions are complex during driving. The selection of driving conditions is made by the driver or determined by the cruise system using the Beidou positioning system. The driving conditions include: long-distance highway driving conditions, special mineral working conditions, port driving conditions, and urban national highway driving conditions. Step D, Self-Adjusting Cruise Mode: By collecting data on vehicle status, driver status, and driving conditions, the vehicle can automatically match and activate the corresponding cruise mode. Cruise modes include: "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 sudden situations and the vehicle urgently needs to slow down, and is activated actively or passively; the high-speed long-distance mode is suitable for high-speed long-distance working conditions; the multi-condition coordination mode and the composite mode can be switched freely and are suitable for special mineral working conditions and port working conditions. The composite mode is also suitable for national highway urban working conditions.

2. The three-state cruise method for pure electric commercial vehicles according to claim 1, characterized in that, In step A, it is determined whether the vehicle can continue to drive. If it can, it continues to drive and the range of the vehicle's speed is determined. If it cannot, the vehicle automatically turns on its hazard lights and enters "0" cruise mode to ensure the safety of the driver and the vehicle.

3. The three-state cruise method for pure electric commercial vehicles according to claim 1, characterized in that, In step A, the vehicle cruise control software status is checked to determine whether there are any errors in the vehicle's pre-driving software self-check; the specific method includes: Test the alarm and emergency rescue devices in the driver's cab to ensure they can continue to open without obstruction and in seconds; For communication in the electronic control program, perform communication diagnostics to determine if there are any errors; The driver status processing of the driver observation system is considered as software status, therefore it is necessary to determine whether the driver status processing process of the driver observation system reports an error.

4. The three-state cruise method for pure electric commercial vehicles according to claim 1, characterized in that, In step B, after cruise control is activated, the driver's vital signs and mental state are continuously monitored to ensure that the driver's condition assessment is accurate.

5. The three-state cruise method for pure electric commercial vehicles according to claim 4, characterized in that, Step B also includes: adjusting the cruise safety speed limit to within 50% based on the driver's condition; Specifically, the cruise safety speed limit is reduced by 10% when entering a state of mild fatigue driving, by 30% when entering a state of moderate fatigue driving, and by 50% when entering a state of severe fatigue driving.

6. The three-state cruise method for pure electric commercial vehicles according to claim 5, characterized in that, In step B, the method for determining fatigued driving is as follows: First, facial information of the driver is collected to gather data on the driver's normal driving state. Then, data on the driver's closed-eye state and facial features are collected. The aspect ratio of the driver's eyes and mouth is collected and analyzed. Since the aspect ratio is different for each person, the decrease in aspect ratio is used to determine the severity: when the aspect ratio decreases by more than 20% of the normal state, it is judged as a mild case; the driver closing his eyes for more than 3 seconds is also judged as a mild case. The driver's mouth corners were also analyzed for their aspect ratio. If the aspect ratio decreased by more than 30% of the normal range, it was considered a mild case. If the aspect ratio of the mouth corners increased by more than 30% of the normal range twice within one minute, it was also considered a mild case. The driver's blinking frequency was also analyzed. The normal blinking frequency is 15-20 times / min. If the driver's frequency was greater than 20 times / min, it was considered a mild case. If one criterion is judged as mild, it is considered mild fatigue driving; if two criteria are met, it is considered moderate fatigue driving; and if two or more criteria are met, it is considered severe fatigue driving.

7. The three-state cruise method for pure electric commercial vehicles according to claim 6, characterized in that, The formula for calculating the aspect ratio is: ; Wherein, P1 is the leftmost point of the eye or corner of the mouth; P2 is the upper 1 / 3 point of the eye or corner of the mouth; P3 is the upper 2 / 3 point of the eye or corner of the mouth; P4 is the rightmost point of the eye or corner of the mouth; P5 is the lower 2 / 3 point of the eye or corner of the mouth; and P6 is the lower 1 / 3 point of the eye or corner of the mouth.

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

9. The three-state cruise method for pure electric commercial vehicles according to claim 8, characterized in that, Step D further includes: during the "0" cruise mode at 0 km / h, the vehicle can be interrupted at any time and accelerated; and when the vehicle leaves the acceleration stroke, the "0" cruise mode still exists and continues to start, gradually driving the vehicle to 0 km / h.

10. A three-state cruise method for pure electric commercial vehicles according to any one of claims 1-7, 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 is not up to standard, the driver will be reminded and the cruise will be discontinued. If the driver responds, the long-distance highway cruise mode will be discontinued immediately. If there is no response, the "0" cruise mode will be activated; and when the vehicle's battery level is below 20%, the driver will be alerted and the long-distance highway cruise mode will be disengaged.

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