CN112362356A - Intelligent vehicle braking and parking capacity testing method considering passenger comfort - Google Patents
Intelligent vehicle braking and parking capacity testing method considering passenger comfort Download PDFInfo
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Abstract
The invention relates to an intelligent vehicle braking and parking capacity testing method considering passenger comfort, which considers two dimensions of safety and experience, adopts a curve fitting method of discrete data, combines the subjective passenger comfort and objective driving data acquired by tests, repeatedly tests and verifies sensitive people to finally obtain a braking deceleration optimal curve, aims to provide an evaluation quantitative standard for evaluating the passenger comfort during braking of an automatic driving vehicle under the condition of considering the passenger comfort, improves related test items related to automatic driving and parking to a height with the same weight of safety and comfort, and provides theoretical basis and technical support for multi-dimensional evaluation of the braking and parking performance of the automatic driving vehicle.
Description
Technical Field
The invention relates to a method for testing the braking and parking capacity of an intelligent vehicle, in particular to a method for testing the braking and parking capacity of the intelligent vehicle by considering the comfort level of passengers.
Background
The maturity of the automatic driving technology is helpful for improving the traffic smooth capacity and reducing the occurrence of traffic accidents, and the intelligent vehicle (automatic classification of automobile driving) 5-level driving automation can realize the full automatic driving, so that passengers can easily handle the things irrelevant to the driving in the driving process. With the development of the automatic driving technology, the test of various functions of the automatic driving device is related to the safety guarantee of various road use main bodies.
The intelligent vehicle braking and parking test method is basically focused on safety dimension at present, and the experience dimension of passengers in the braking process still lacks the test specification of a system. Because the braking deceleration of the automatic driving vehicle has a nonlinear characteristic, the change trend of the automatic driving vehicle is difficult to accurately describe by using a simple mathematical equation, meanwhile, the comfort degree of a vehicle passenger has a subjective characteristic, individuals have differences, and a unified and efficient evaluation standard is lacked in the test scene specification establishment in the field in domestic and foreign demonstration areas.
Disclosure of Invention
In order to solve the technical problem, the invention provides an intelligent vehicle braking and parking capacity testing method considering passenger comfort, which comprises the following steps of:
(1) constructing a test site, and determining a tested passenger and a tested automatic driving vehicle;
the test site should meet the following requirements:
the pavement is dry and has no obvious visible wet place;
the peak value adhesion coefficient between the test road surface and the test tire is more than 0.9;
the test pavement is straight and flat, has no obvious adverse conditions such as bulges, pits, cracks and the like, and has the horizontal flatness of less than 1 percent and the length of not less than 400 m;
in the test process, no vehicle or barrier can be arranged within 3m of two sides of the test road and within 25m in front of the static target vehicle;
the tested passengers determine the number of people, the sex ratio and the age distribution according to the sex and the age distribution ratio of the population in China, and the tested passengers also comprise tested persons with carsickness symptoms of different degrees.
(2) Establishing speed conditions for the braking test: setting a plurality of different initial speeds u at fixed speed intervals in a certain initial speed interval0(ii) a At maximum deceleration ab maxTo a minimum deceleration ab minWithin the interval, a plurality of different braking decelerations a are set at a certain interval of the braking decelerationbWherein the maximum deceleration ab maxNot exceeding the deceleration that the maximum braking force on the ground can provide, i.e.
Peak adhesion coefficient; minimum deceleration ab minNot lower than the minimum braking deceleration specified by the national standard, i.e. ab min≥aISO(ii) a Wherein, aISOThe minimum braking deceleration of the automobile cold test is specified for ISO 6597;
(3) in a test site, a tested passenger takes a tested automatic driving vehicle, and the process from the start of braking to the stop of the tested automatic driving vehicle is taken as test content to acquire the braking deceleration and the instantaneous running speed of the tested automatic driving vehicle in real time;
(4) in the test process, the comfort subjective feelings of each subject when the tested automatic driving vehicle performs the brake test with different brake decelerations are collected, wherein the comfort subjective feelings comprise four subjective evaluation indexes of 'very comfortable', 'more comfortable', 'less comfortable' and 'very uncomfortable', and the four subjective evaluation indexes are used as the corresponding initial speed u of the subject0And braking deceleration abBy adjusting the weighting factor w to reflect the acquired subjectThe higher the w value is, the more important the data is in the curve fitting process, and in the test, the comfort degree and the w value are in positive correlation;
(5) the value of the comfort weighting factor w is determined using Analytic Hierarchy Process (AHP):
for the subjective feeling of the comfort level acquired in the previous step, a reasonable judgment matrix is constructed through comparison of importance degrees between every two evaluation indexes to obtain a comparison judgment matrix, the judgment matrix is normalized and averaged in rows in sequence to obtain a weight vector, consistency inspection is carried out on the weight vector, and the weighting coefficients of the comfort levels corresponding to 'very comfortable', 'more comfortable', 'less comfortable' and 'very uncomfortable' can be obtained after the consistency inspection is met;
(6) based on discrete statistical data acquired and processed by a subject, combining with the weighting of a subjective evaluation coefficient w of the subject, and adopting a weighted least square method as a curve fitting method to obtain a braking deceleration optimal curve, wherein the corresponding equation set is as follows:
in the formula, l is the acquired data volume; w is ai、u0iAnd abiComfort degree weighting coefficient, braking initial speed and braking deceleration of the ith group of data are respectively set; n is the optimum polynomial degree selected according to the fitting degree; a is0,a1,…,anFitting coefficients for the polynomial;
solving the above equation system can obtain the mathematical expression that the optimal braking deceleration changes with the initial speed:
acoft＝ab＝a0+a1u0+a2u0 2+…+anu0 n
in the formula, acoftFor optimal braking deceleration; u. of0Is the initial speed;
with acoftAs occupant comfortAccording to the evaluation, when the automatic driving vehicle adopts the deceleration a not more than the optimal braking deceleration acoftBraking deceleration abDuring braking, the vehicle is considered to meet the requirement of comfort level of passengers, otherwise, the vehicle is considered not to reach the comfort level index.
(7) Designing a test scene:
the braking process of the tested automatic driving vehicle in the test scene is divided into three parts, and the behavior nodes are respectively point A, B, C: test autonomous vehicle to design initial speed u0Automatically driving to a point A at a constant speed, and starting braking when the point A is reached; in the section from A to B, the braking force is continuously and linearly increased, and when the point B is reached, the braking force of the tested vehicle is increased to FpDeceleration is increased to abeAt which time the vehicle under test is at an instantaneous speed ueContinue to run, and ueIs greater than 0; the vehicle under test is at an instantaneous speed ueDeceleration abePassing through the point B to the point C, the braking force and the deceleration in the road sections from B to C are constant, and the speed u at the point Cc＝0；
Selecting braking initial speed u according to vehicle type to be tested0Further determining the position A of three braking points on the test routeISO、AcomfortAnd Arisk：
If and only if the target deceleration
Time brake distance sACAt the minimum, this braking point is the most dangerous braking point, denoted AriskBecause there is a great risk that the vehicle cannot be parked at the predetermined parking position if the vehicle takes a braking action after exceeding the predetermined parking position; when a isbe＝aISOWhile, the braking distance sAC＝sACrangeReaching the maximum value in the national standard allowable range, the braking point is the braking point in the maximum allowable range and is marked as AISOThe starting of braking at this braking point is the maximum braking distance allowed by international standards; when the comfort of passengers is considered, the optimal braking deceleration a at the current test braking initial speed is obtained by the braking deceleration optimal curvecoftObtaining the corresponding braking distance sACcomfortAt the same time due to ab＝acoft＜abmaxKnowing its braking distance sACcomfortHas a value range of sACmin＜sACcomfort＜sACrangeThe braking point is marked as Acomfort；
(8) In the test scene, the automatic driving vehicle to be tested enters a test road section at a preset initial speed, and autonomously performs braking action, wherein the evaluation criteria are as follows:
the braking behavior of the vehicle to be tested occurs in AriskThe rear, braking action taking place at braking point AISOWhen the front or parking point exceeds the preset parking point C, the vehicle to be tested is considered to be incapable of meeting the requirement of the safety dimension, and the evaluation grade is recorded as unqualified;
the vehicle that awaits measuring can be in predetermineeing parking point C department braking parking, thinks to satisfy the requirement of safe dimension, further evaluates braking parking passenger comfort level:
the braking behavior of the vehicle to be tested occurs in AISOAnd AcomfortIn the meantime, the passenger experience dimension requirement is considered to be met, and the evaluation level is recorded as 'comfort';
the braking behavior of the vehicle to be tested occurs in AcomfortThen, the passenger experience dimension requirement is considered to be not satisfied, and the evaluation level is recorded as "uncomfortable".
Further, step (7) determines point A, B, C and braking point position A based on the following theoretical calculationISO、AcomfortAnd Arisk：
The brake braking process of the tested automatic driving vehicle is divided into three parts: the brake is acted, continuously braked and released;
1) in the brake application phase t1In the time period:
since the brake shoe is pulled by the rebound spring and a gap exists between the shoe and the brake drum, the time t 'is required for the brake shoe to contact the brake drum'1The ground braking force can only be activated and cause the vehicle to produce deceleration, hence period t'1The inner vehicle moves at constant speed t'1Velocity constant in the section is u0，t’1The distance traveled by the segment vehicle is s'1＝u0t’1；
Time period t after brake application1And the automatic driving vehicle makes an autonomous decision according to the test scene to ensure that the braking deceleration a of the vehiclebFrom ab0Linearly increasing to the required braking deceleration abe(ii) a Due to the fact that
In the formula
So ═ du ═ ktdt, then
t1At a time of vehicle speed of
Due to the fact that
Then
Get t ═ t ″)1Distance of time period
From the above can be obtained at t1Distance of section brake
2) During the continuous braking phase t2In the time period:
the braking force reaches a constant value FpeThe deceleration of the vehicle reaches a required value abeAnd keeping constant uniform deceleration movement, the initial speed of the stage is ueLast speed is zero and carry in ueTo obtain t2The braking distance of the segment is
From the above 1) and 2) the total braking distance obtainable is
Due to t1' and t1"very Small, obviously, abeThe larger the total braking distance s is;
braking distance s from road A to road BABThe calculation method is
Braking distance s from road B to road CBCThe calculation method is
Braking distance s from road A to road CACThe calculation method is
The invention has the beneficial effects that:
the invention provides an intelligent vehicle braking and parking testing method considering passenger comfort feeling aiming at the whole process of an automatic driving braking and parking scene, which considers two dimensions of safety and experience, adopts a curve fitting method of discrete data, combines the passenger subjective comfort degree and objective driving data acquired by tests, repeatedly tests and verifies sensitive people (test groups can find car sickness people), and finally obtains a braking deceleration optimal curve, aims to provide an evaluation quantification standard for evaluating the passenger comfort degree during braking of an automatic driving vehicle under the condition of considering the passenger comfort degree, and improves related test items relating to automatic driving and parking to the height of safety and comfort. Theoretical basis and technical support are provided for multi-dimensional evaluation of the braking and stopping performance of the automatic driving vehicle. The invention firstly solves the problems that the comfort level of a vehicle passenger has subjective characteristics and the individual difference exists, creatively adopts a weighted curve fitting mode to correlate subjective evaluation and objective indexes, and constructs an automatic driving braking and parking capability test scene considering the comfort level of the passenger by establishing a mathematical relation between a braking distance and braking deceleration in automatic driving and taking the position of a braking action as an evaluation index, so that the test efficiency is higher, the repeatability is stronger, the test cost is reduced, the quantitative evaluation of the comfort level of braking and parking is completed, and a unified and effective theoretical basis and research method are provided for the braking decision optimization of the automatic driving vehicle.
Drawings
FIG. 1 is a simplified broken line schematic illustration of deceleration change during braking of an autonomous vehicle in accordance with the present invention;
FIG. 2 is a schematic view of a vehicle behavior for a test scenario of the present invention;
FIG. 3 is a schematic view of the stopping point of the test scenario of the present invention.
Detailed Description
The invention provides a method for testing the braking and parking capacity of an intelligent vehicle with consideration of the comfort of passengers, which comprises the following steps:
(2) constructing a test site, and determining a tested passenger and a tested automatic driving vehicle;
the test site should meet the following requirements:
the pavement is dry and has no obvious visible wet place;
the peak value adhesion coefficient between the test road surface and the test tire is more than 0.9;
the test pavement is straight and flat, has no obvious adverse conditions such as bulges, pits, cracks and the like, and has the horizontal flatness of less than 1 percent and the length of not less than 400 m;
in the test process, no vehicle or barrier can be arranged within 3m of two sides of the test road and within 25m in front of the static target vehicle;
the tested passengers determine the number of people, the sex ratio and the age distribution according to the sex and the age distribution ratio of the population in China, and also comprise the testees with car sickness symptoms of different degrees, because the experience of the passengers on the speed and the braking deceleration of the vehicle is more sensitive than that of the ordinary people; j panelists of different genders and ages were selected.
The intelligent vehicle to be tested needs to meet the requirement that the driving mileage is not higher than 5000 km; the fuel quantity before the test is more than 90% of the volume of the fuel tank; for new energy vehicles capable of being externally charged, the power storage battery is fully charged according to GB/T18385-20055.1 the day before the test; and for the new energy vehicle which cannot be externally charged, preparing a test according to the normal running state of the vehicle.
(2) Establishing speed conditions for the braking test: setting a plurality of different initial speeds u at fixed speed intervals in a certain initial speed interval0(ii) a At maximum deceleration ab maxTo a minimum deceleration ab minWithin the interval, a plurality of different braking decelerations a are set at a certain interval of the braking decelerationbWherein the maximum deceleration ab maxNot exceeding the deceleration that the maximum braking force on the ground can provide, i.e.
Peak adhesion coefficient; minimum deceleration ab minNot lower than the minimum braking deceleration specified by the national standard, i.e. ab min≥aISO(ii) a Wherein, aISOThe minimum braking deceleration of the automobile cold test is specified for ISO 6597; and setting a group of m braking initial speeds according to the test scene and the requirements of the automatic driving vehicle to be tested, and setting a group of k braking decelerations in a reasonable interval.
(3) In a test site, a tested passenger takes a tested automatic driving vehicle, and the process from the start of braking to the stop of the tested automatic driving vehicle is taken as test content to acquire the braking deceleration and the instantaneous running speed of the tested automatic driving vehicle in real time;
(4) in the test process, the comfort subjective feelings of each subject when the tested automatic driving vehicle performs the brake test with different brake decelerations are collected, wherein the comfort subjective feelings comprise four subjective evaluation indexes of 'very comfortable', 'more comfortable', 'less comfortable' and 'very uncomfortable', and the four subjective evaluation indexes are used as the corresponding initial speed u of the subject0And braking deceleration abThe four collected subjective evaluations of the testees are embodied by adjusting the weighting coefficient wThe higher the value of w is, the more important the data is in the process of curve fitting, and in the test, the comfort degree and the value of w are in positive correlation;
(5) the value of the comfort weighting factor w is determined using Analytic Hierarchy Process (AHP):
for the subjective feeling of the comfort level acquired in the previous step, a reasonable judgment matrix is constructed by comparing the importance degrees of every two evaluation indexes, and the result is shown in table 1.
TABLE 1 comparison of the degree of importance
| Layer of criteria | Very comfortable | Is more comfortable | Is less comfortable | Is very uncomfortable |
| Very comfortable | 1 | 3 | 7 | 9 |
| Is more comfortable | 1/3 | 1 | 5 | 7 |
| Is less comfortable | 1/7 | 1/5 | 1 | 3 |
| Is very uncomfortable | 1/9 | 1/7 | 1/3 | 1 |
The obtained comparison judgment matrix J is:
normalizing the judgment matrix J according to columns to obtain a matrix:
performing row average on the judgment matrix J to obtain a weight vector:
calculating the maximum characteristic root gamma of the judgment matrix J of the evaluation indexmax：
In order to ensure the logical consistency of the judgment ideas and ensure that the judgment ideas are coordinated and consistent without internal contradiction, the consistency is checked. The consistency index c.i. is:
by referring to the "average random consistency index c.r. value", when n is 4, c.r. is 0.9, so that
Therefore, the judgment result of the obtained comparison matrix is considered to be acceptable.
Thus, "very comfortable," "more comfortable," "less comfortable," and "very uncomfortable" are obtained with comfort weighting coefficients of 0.58, 0.29, 0.09, and 0.05.
(6) Based on discrete statistical data acquired and processed by a subject, combining with the weighting of a subjective evaluation coefficient w of the subject, and adopting a weighted least square method as a curve fitting method to obtain a braking deceleration optimal curve, wherein the corresponding equation set is as follows:
in the formula, l is the acquired data volume; w is ai、u0iAnd abiComfort degree weighting coefficient, braking initial speed and braking deceleration of the ith group of data are respectively set; n is the optimum polynomial degree selected according to the fitting degree; a is0,a1,…,anFitting coefficients for the polynomial;
solving the above equation system can obtain the mathematical expression that the optimal braking deceleration changes with the initial speed:
acoft＝ab＝a0+a1u0+a2u0 2+…+anu0 n
in the formula, acoftFor optimal braking deceleration; u. of0Is the initial speed;
with acoftAs the evaluation basis of the comfort degree of passengers, when the automatic driving vehicle adopts the braking deceleration not more than the optimal braking decelerationDegree acoftBraking deceleration abDuring braking, the vehicle is considered to meet the requirement of comfort level of passengers, otherwise, the vehicle is considered not to reach the comfort level index.
(7) Designing a test scene:
the conventional vehicle braking process is divided into 4 stages: the driver responds after receiving the signal, the brake acts, the brake is continuously braked and released, the perception, decision and execution operation time of the automatic driving vehicle to the signal are far shorter than the reaction time of the driver, the invention ignores the time consumption of the phase, and the brake braking process of the tested automatic driving vehicle is divided into three parts: the brake is acted, continuously braked and released; a simplified autonomous vehicle deceleration line graph is plotted as shown in fig. 1.
1) In the brake application phase t1In the time period:
since the brake shoe is pulled by the rebound spring and a gap exists between the shoe and the brake drum, the time t 'is required for the brake shoe to contact the brake drum'1The ground braking force can only be activated and cause the vehicle to produce deceleration, hence period t'1The inner vehicle moves at constant speed t'1Velocity constant in the section is u0，t’1The distance traveled by the segment vehicle is s'1＝u0t’1；
Time period t after brake application1And the automatic driving vehicle makes an autonomous decision according to the test scene to ensure that the braking deceleration a of the vehiclebFrom ab0Linearly increasing to the required braking deceleration abe(ii) a Due to the fact that
In the formula
So ═ du ═ ktdt, then
t1At a time of vehicle speed of
Due to the fact that
Then
Get t ═ t ″)1Distance of time period
From the above can be obtained at t1Distance of section brake
2) During the continuous braking phase t2In the time period:
the braking force reaches a constant value FpeThe deceleration of the vehicle reaches a required value abeAnd keeping constant uniform deceleration movement, the initial speed of the stage is ueLast speed is zero and carry in ueTo obtain t2The braking distance of the segment is
From the above 1) and 2) the total braking distance obtainable is
Due to t1' and t1"very Small, obviously, abeThe larger the total braking distance s is;
the braking process of the tested autonomous driving vehicle in the test scenario is divided into three parts, as shown in fig. 2, behavior nodes are respectively points A, B, C: test autonomous vehicle to design initial speed u0Automatically driving to a point A at a constant speed, and starting braking when the point A is reached; in the section from A to B, the braking force is continuously and linearly increased, and when the point B is reached, the braking force of the tested vehicle is increased to FpDeceleration is increased to abeAt which time the vehicle under test is at an instantaneous speed ueContinue to run, and ue＞0；
Braking distance s from road A to road BABThe calculation method is
The vehicle under test is at an instantaneous speed ueDeceleration abePassing through the point B to the point C, the braking force and the deceleration in the road sections from B to C are constant, and the speed u at the point Cc＝0；
Braking distance s from road B to road CBCThe calculation method is
Braking distance s from road A to road CACThe calculation method is
Selecting braking initial speed u according to vehicle type to be tested0Further determining the position A of three braking points on the test routeISO、AcomfortAnd Arisk：
If and only if the target deceleration
Time brake distance sACAt the minimum, this braking point is the most dangerous braking point, denoted AriskBecause there is a great risk that the vehicle cannot be parked at the predetermined parking position if the vehicle takes a braking action after exceeding the predetermined parking position; when a isbe＝aISOWhile, the braking distance sAC＝sACrangeReaching the maximum value in the national standard allowable range, the braking point is the braking point in the maximum allowable range and is marked as AISOThe starting of braking at this braking point is the maximum braking distance allowed by international standards; when the comfort of passengers is considered, the optimal braking deceleration a at the current test braking initial speed is obtained by the braking deceleration optimal curvecoftObtaining the corresponding braking distance sACcomfortAt the same time due to ab＝acoft＜abmaxTo know the braking distancesACcomfortHas a value range of sACmin＜sACcomfort＜sACrangeThe braking point is marked as Acomfort(ii) a The schematic diagram of the stopping point of the test scene is obtained as shown in the attached figure 3.
(8) And after the state of the vehicle to be tested is confirmed, starting to perform the autonomous braking parking test. In the test scene, the automatic driving vehicle to be tested enters a test road section at a preset initial speed, braking behavior is automatically carried out, and safety and experience two dimensions of the automatic driving vehicle to be tested in braking and parking are evaluated according to the following evaluation criteria:
the braking behavior of the vehicle to be tested occurs in AriskThe rear, braking action taking place at braking point AISOWhen the front or parking point exceeds the preset parking point C, the vehicle to be tested is considered to be incapable of meeting the requirement of the safety dimension, and the evaluation grade is recorded as unqualified;
the vehicle that awaits measuring can be in predetermineeing parking point C department braking parking, thinks to satisfy the requirement of safe dimension, further evaluates braking parking passenger comfort level:
the braking behavior of the vehicle to be tested occurs in AISOAnd AcomfortIn the meantime, the passenger experience dimension requirement is considered to be met, and the evaluation level is recorded as 'comfort';
the braking behavior of the vehicle to be tested occurs in AcomfortThen, the passenger experience dimension requirement is considered to be not satisfied, and the evaluation level is recorded as "uncomfortable".
Claims (6)
1. The intelligent vehicle braking and parking capacity testing method considering the comfort of passengers is characterized by comprising the following steps of:
(1) constructing a test site, and determining a tested passenger and a tested automatic driving vehicle;
(2) establishing speed conditions for the braking test: setting a plurality of different initial speeds u at fixed speed intervals in a certain initial speed interval0(ii) a At maximum deceleration abmaxTo a minimum deceleration abminWithin the interval, a plurality of different braking decelerations a are set at a certain interval of the braking decelerationb；
(3) In a test site, a tested passenger takes a tested automatic driving vehicle, and the process from the start of braking to the stop of the tested automatic driving vehicle is taken as test content to acquire the braking deceleration and the instantaneous running speed of the tested automatic driving vehicle in real time;
(4) in the test process, the comfort subjective feelings of each subject when the tested automatic driving vehicle performs the brake tests with different brake decelerations are collected and used as the corresponding initial speed u of the subject0And braking deceleration abThe comfort weighting coefficient w;
(5) determining the value of the comfort weighting coefficient w by adopting an analytic hierarchy process:
for the subjective feeling of the comfort degree collected in the last step, a reasonable judgment matrix is constructed through comparison of importance degrees between every two evaluation indexes to obtain a comparison judgment matrix, consistency inspection is carried out on the comparison judgment matrix, and the weighting coefficient corresponding to the comfort degree can be obtained after the consistency inspection is met;
(6) based on discrete statistical data acquired and processed by a subject, combining with the weighting of a subjective evaluation coefficient w of the subject, and adopting a weighted least square method as a curve fitting method to obtain a braking deceleration optimal curve:
acoft＝ab＝a0+a1u0+a2u0 2+…+anu0 n
in the formula, acoftFor optimal braking deceleration; u. of0Is the initial speed; a is0,a1,…,anFitting coefficients for the polynomial;
(7) designing a test scene:
the braking process of the tested automatic driving vehicle in the test scene is divided into three parts, and the behavior nodes are respectively point A, B, C: test autonomous vehicle to design initial speed u0Automatically driving to a point A at a constant speed, and starting braking when the point A is reached; in the section from A to B, the braking force is continuously and linearly increased, and when the point B is reached, the braking force of the tested vehicle is increased to FpDeceleration is increased to abeAt which time the vehicle under test is at an instantaneous speed ueContinue to run, and ueIs greater than 0; subject to testVehicle at instantaneous speed ueDeceleration abePassing through the point B to the point C, the braking force and the deceleration in the road sections from B to C are constant, and the speed u at the point Cc＝0；
Selecting braking initial speed u according to vehicle type to be tested0Further determining the position A of three braking points on the test routeISO、AcomfortAnd Arisk：
If and only if the target deceleration
Time brake distance sACAt the minimum, this braking point is the most dangerous braking point, denoted Arisk(ii) a When a isbe＝aISOWhile, the braking distance sAC＝sACrangeReaching the maximum value in the national standard allowable range, the braking point is the braking point in the maximum allowable range and is marked as AISO(ii) a When the comfort of passengers is considered, the optimal braking deceleration a at the current test braking initial speed is obtained by the braking deceleration optimal curvecoftObtaining the corresponding braking distance sACcomfortAt the same time due to ab＝acoft＜abmaxKnowing its braking distance sACcomfortHas a value range of sACmin＜sACcomfort＜sACrangeThe braking point is marked as Acomfort；
(8) In the test scene, the automatic driving vehicle to be tested enters a test road section at a preset initial speed, and autonomously performs braking action, wherein the evaluation criteria are as follows:
the braking behavior of the vehicle to be tested occurs in AriskThe rear, braking action taking place at braking point AISOWhen the front or parking point exceeds the preset parking point C, the vehicle to be tested is considered to be incapable of meeting the requirement of the safety dimension, and the evaluation grade is recorded as unqualified;
the vehicle that awaits measuring can be in predetermineeing parking point C department braking parking, thinks to satisfy the requirement of safe dimension, further evaluates braking parking passenger comfort level:
the braking behavior of the vehicle to be tested occurs in AISOAnd AcomfortIn the middle, considerIn order to meet the dimensional requirement of the experience of passengers, the evaluation level is recorded as 'comfort';
the braking behavior of the vehicle to be tested occurs in AcomfortThen, the passenger experience dimension requirement is considered to be not satisfied, and the evaluation level is recorded as "uncomfortable".
2. The intelligent vehicle braking and parking ability testing method considering passenger comfort as claimed in claim 1, wherein: the test site in the step (1) should meet the following requirements:
the pavement is dry and has no obvious visible wet place;
the peak value adhesion coefficient between the test road surface and the test tire is more than 0.9;
the test pavement is straight and flat, has no obvious adverse conditions including bulges, pits and cracks, and has the horizontal flatness of less than 1 percent and the length of not less than 400 m;
in the test process, no vehicle or barrier can be arranged within 3m of two sides of the test road and within 25m in front of the static target vehicle;
the tested passengers determine the number of people, the sex ratio and the age distribution according to the sex and the age distribution ratio of the population in China, and the tested passengers also comprise tested persons with carsickness symptoms of different degrees.
3. The intelligent vehicle braking and parking ability testing method considering passenger comfort as claimed in claim 1, wherein: in step (2), the maximum deceleration abmaxNot exceeding the deceleration that the maximum braking force on the ground can provide, i.e.
Peak adhesion coefficient; minimum deceleration abminNot lower than the minimum braking deceleration specified by the national standard, i.e. abmin≥aISOWherein a isISOThe minimum brake deceleration for the cold test of the vehicle is specified for ISO 6597.
4. The intelligent vehicle braking and parking ability testing method considering passenger comfort as claimed in claim 1, wherein: in the step (4), the comfort subjective feeling comprises four subjective evaluation indexes of 'very comfortable', 'relatively uncomfortable' and 'very uncomfortable', the four acquired subjective evaluation indexes of the testees are embodied by adjusting the weighting coefficient w, and the higher the value of w is, the more important the data is in the curve fitting process.
5. The intelligent vehicle braking and parking ability testing method considering passenger comfort as claimed in claim 1, wherein: in the step (6), based on discrete statistical data acquired and processed by the subject, weighting is performed by combining with a subjective evaluation coefficient w of the subject, and a braking deceleration optimal curve is obtained by using a weighted least square method as a curve fitting method, wherein a corresponding equation set is as follows:
in the formula, l is the acquired data volume; w is ai、u0iAnd abiComfort degree weighting coefficient, braking initial speed and braking deceleration of the ith group of data are respectively set; n is the optimum polynomial degree selected according to the fitting degree; a is0,a1,…,anFitting coefficients for the polynomial;
solving the above equation system can obtain the mathematical expression that the optimal braking deceleration changes with the initial speed:
acoft＝ab＝a0+a1u0+a2u0 2+…+anu0 n
in the formula, acoftFor optimal braking deceleration; u. of0Is the initial speed;
with acoftAs the evaluation basis of the comfort degree of passengers, when the automatic driving vehicle adopts the braking deceleration not more than the optimal braking decelerationDegree acoftBraking deceleration abDuring braking, the vehicle is considered to meet the requirement of comfort level of passengers, otherwise, the vehicle is considered not to reach the comfort level index.
6. The intelligent vehicle braking and parking ability testing method considering passenger comfort as claimed in claim 1, wherein: in the step (7), the brake process of the tested automatic driving vehicle is divided into three parts: the brake is acted, continuously braked and released;
1) in the brake application phase t1In the time period:
brake application phase t1Comprises t'1And t1"two phases, time t 'to brake shoe contact brake drum'1Ground braking force can only be activated and the vehicle is caused to produce deceleration, period t'1The inner vehicle moves at constant speed t'1Velocity constant in the section is u0，t′1The distance traveled by the segment vehicle is s'1＝u0t′1；
Time period t after brake application1And the automatic driving vehicle makes an autonomous decision according to the test scene to ensure that the braking deceleration a of the vehiclebFrom the initial braking deceleration ab0Linearly increasing to the required braking deceleration abe(ii) a Due to the fact that
In the formula
So ═ du ═ ktdt, then
t1At a time of vehicle speed of
Due to the fact that
Then
Get t ═ t1Distance of time period
From the above can be obtained at t1Distance of braking in time period
2) During the continuous braking phase t2In the time period:
the braking force reaches a constant value FpeThe deceleration of the vehicle reaches a required value abeAnd keeping constant uniform deceleration movement, the initial speed of the stage is ueLast speed is zero and carry in ueTo obtain t2The braking distance of the segment is
From the above 1) and 2) the total braking distance obtainable is
Braking distance s from road A to road BABThe calculation method is
Braking distance s from road B to road CBCThe calculation method is
Braking distance s from road A to road CACThe calculation method is
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