CN114863587A - Method for offline acquisition and evaluation of gear shifting rule of hydraulic mechanical automatic transmission - Google Patents
Method for offline acquisition and evaluation of gear shifting rule of hydraulic mechanical automatic transmission Download PDFInfo
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Abstract
The invention belongs to the technical field of control of automatic transmissions of passenger vehicles, and relates to an off-line obtaining and evaluating method for a gear shifting rule of a hydraulic mechanical automatic transmission. The method comprises the following steps: s1: an accelerator pedal opening degree zone; s2: acquiring a gear-up curve; s3: obtaining a downshift curve; s4: synthesizing an upshift curve and a downshift curve into an offline gear shifting rule; s5: evaluating an offline gear shifting rule; s6: and evaluating and optimizing to form a final offline gear shifting rule. The invention can calibrate the gear shifting rule in the early stage before the sample vehicle comes out, effectively forwards the calibration work, and reliably guarantees the real-time performance and rapidity of the gear shifting rule applied to the real vehicle; after the relevant parameters are updated, the updated gear shifting rule can be quickly obtained; the adjustment of the gear shifting rule can be intuitively analyzed and evaluated to improve the relevant drivability of the whole vehicle; the workload and the human resource input in the test calibration stage are reduced, and meanwhile, the gear shifting rule with the brand DNA characteristic is more favorably established.
Description
Technical Field
The invention belongs to the technical field of control of automatic transmissions of passenger vehicles, and relates to an off-line obtaining and evaluating method for a gear shifting rule of a hydraulic mechanical automatic transmission.
Background
The gear shifting rule is a MAP (MAP) diagram of automatic gear shifting with adjacent gears changing along with control parameters in the running process of a vehicle, and the two-parameter control gear shifting rule of the vehicle speed and the accelerator pedal opening degree which is widely applied at present is closely related to the dynamic property, the economical efficiency and the driving property of the whole vehicle and needs to be correspondingly adjusted according to the complex environment, the running state and the intention of a driver where the vehicle is located. In the calibration process, a long-time manual real vehicle multi-working-condition test calibration test needs to be carried out, the workload is large, and the influence of the state of a calibration sample vehicle, road conditions, environment and the like is easily caused.
In the face of short cycle, low cost and higher driving experience pursuit of customers, how to obtain a gear shifting rule meeting the requirements of power performance, economy and customer drivability in a short time is a concern.
CN105485325A provides a method for calibrating the speed of an automatic transmission up-shifting vehicle, which gives consideration to fuel economy and dynamic property, and comprises the following steps: a, selecting an engine rotating speed measuring point; b, setting the corresponding vehicle speed of each measuring point in each gear as the upshift vehicle speed of the fixed accelerator pedal opening; c, starting the vehicle in situ, fixing the opening degree of an accelerator pedal, measuring the acceleration time and the working condition oil consumption corresponding to the engine rotating speed of each measuring point in the step a, drawing a fuel economy-dynamic curve by taking the acceleration time as a horizontal coordinate and the working condition oil consumption as a vertical coordinate, and taking the speed of each gear calculated in the step b corresponding to an inflection point on the curve as the speed of the upshift with the fixed opening degree; and d, repeating the steps, and connecting the gear-up vehicle speeds into a gear-up curve by taking the vehicle speed as a horizontal coordinate and the opening as a vertical coordinate. The method provided by the invention can fully give consideration to fuel economy and dynamic property under the condition of ensuring the acceleration performance.
This application compares patent advantage that retrieves and lies in:
1. retrieving patents is based on real-vehicle testing; the method aims to obtain the gear shifting rule in an off-line mode under the condition of no sample vehicle, and can effectively move the calibration work forwards;
2. the retrieval patent is only for the description of the method for calibrating the speed of the upshift vehicle, the application has the description of the method for acquiring the upshift and downshift curves, and the retrieval patent is different from the retrieval patent in the method for acquiring the gear shifting rule;
3. the method for evaluating the gear shifting rule offline is introduced, and the drivability related to the gear shifting rule is considered while the economy and the dynamic performance are considered.
CN111810624A discloses a method for determining a shift schedule and a vehicle, the method for determining includes: determining the opening degree of a reference accelerator pedal of the up-shift vehicle speed; determining an upshift speed determination principle of a reference accelerator pedal opening; calculating the rotating speed of the upshifting engine according to the upshifting vehicle speed determining principle; fitting an engine speed curve during gear-up, and calculating the gear-up engine speed corresponding to the opening degree of each accelerator pedal; calculating a gear-up speed point and obtaining a gear-up vehicle speed curve according to the gear-up engine speed and vehicle parameters; obtaining a fixed time length according to the opening degree and the gear of an accelerator pedal; calculating a downshift speed point according to the fixed time length and the upshift line speed, and obtaining a downshift speed line and adjusting the downshift speed line according to the set fixed accelerator pedal opening value; and combining the upshift vehicle speed line and the downshift vehicle speed line into a gear shifting rule.
This application compares patent advantage that retrieves and lies in:
1. retrieving patents is based on real-vehicle testing; the method aims to obtain the gear shifting rule in an off-line mode under the condition of no sample vehicle and effectively move the calibration work forwards;
2. the method for acquiring the gear shifting rule is different from the method for acquiring the gear shifting rule;
3. the method for evaluating the gear shifting rule offline is introduced, and drivability related to the gear shifting rule is considered.
CN110108499B discloses a comprehensive evaluation method for shift schedule of an automatic transmission, which performs comprehensive quantitative evaluation on the economy and the dynamic property of the shift schedule of the automatic transmission. The method comprises the following steps: measuring specific oil consumption and vehicle acceleration of each vehicle speed; formulating an optimal economic gear shifting rule and an optimal dynamic gear shifting rule; calculating a reference parameter of the quantitative evaluation index; and fourthly, calculating the economic index and the dynamic index of the gear shifting rule, and finishing the quantitative evaluation of the economic index and the dynamic index of the whole gear shifting rule. The smaller the calculated index value is, the better the corresponding performance of the represented vehicle is, and the index value can be used as an important index in evaluating the quality of the gear shifting rule of the automatic transmission, thereby providing an important basis for ensuring the vehicle performance.
This application compares patent advantage that retrieves and lies in:
1. the patent retrieval is based on quantitative evaluation of real vehicle test; the method aims to obtain the gear shifting rule in an off-line mode under the condition of no sample vehicle, and can effectively move the calibration work forwards;
2. the method for acquiring the gear shifting rule is different from the method for acquiring the gear shifting rule;
3. the retrieved patent is used for carrying out quantitative evaluation on economy and dynamic performance, and the method is different from the retrieved patent in off-line evaluation of the gear shifting rule, and considers the economy and the dynamic performance and also considers the drivability related to the gear shifting rule.
Disclosure of Invention
The invention discloses an off-line obtaining and evaluating method for a gear shifting rule of an automatic transmission, and a flow chart refers to fig. 1 and aims to:
1. calculating a gear shifting rule by using an analytic method, and obtaining the gear shifting rule with both dynamic property and economical efficiency under the condition of no sample vehicle;
2. a gear shifting rule off-line evaluation method is introduced, the relevant drivability of the gear shifting rule is optimized, and the whole vehicle gear shifting rule calibration work is effectively advanced.
With reference to the attached drawings of the specification, the purpose of the invention is to realize an off-line acquisition and evaluation method of the gear shifting rule of the hydromechanical automatic transmission by the following technical scheme, comprising the following steps:
s1: an accelerator pedal opening degree zone;
s2: acquiring a gear-up curve;
s3: obtaining a downshift curve;
s4: synthesizing an upshift curve and a downshift curve into an offline gear shifting rule;
s5: evaluating an offline gear shifting rule;
s6: and evaluating and optimizing to form a final offline gear shifting rule.
Further, in step S1, the accelerator pedal opening division means dividing the accelerator pedal opening range into a low load region, an intermediate load region, and a high load region; a combined gear shifting rule is adopted, namely the gear shifting rule is formed by combining three sections of gear shifting curves with different changes according to accelerator pedal subareas, and different vehicle performances are obtained within different accelerator pedal opening ranges;
further, step S1 is to divide the opening degree of the accelerator pedal into three areas, namely 0-30%, 30-80% and 80-100%;
further, in the step S2, acquiring the upshift curves means acquiring the shift curves of the three divisions in the step S1;
the method comprises the following steps:
step S21, a low load region upshift curve is obtained: the method is characterized in that the fuel consumption curves of specific accelerator pedal opening and various gears are drawn according to universal characteristic data of an engine in 5% equal step length within 0-30% of pedal range; taking an intersection point or an end point as a gear shifting point;
step S22, obtaining a mid-load region upshift curve: performing polynomial fitting according to a least square method, fitting an engine torque curve, converting acceleration into functions of accelerator pedal opening, vehicle speed and speed ratio through formula derivation, and making vehicle speed-acceleration curves of specific accelerator pedal opening and various gears; drawing a vehicle speed-acceleration curve of each gear under each accelerator pedal opening by taking 10% of the accelerator pedal opening as a step length, taking an intersection point as an upshift point of each gear under the accelerator pedal opening, and taking the highest vehicle speed without the intersection point as a shift point, thereby obtaining the optimal acceleration;
step S23, a high load region upshift curve is obtained: the reserved target value of the rotation speed is obtained by a lookup table, a gear shifting point is set according to the allowed maximum engine rotation speed under the condition of 100% pedal opening, and the gear shifting point is connected with the gear shifting point under the condition of 80% accelerator opening determined in the step S3 to form an upshift curve in a high load area.
Further, in step S3, the obtaining of the downshift curves refers to obtaining the downshift curves in the low load region and the high load region respectively; the method comprises the following steps:
step S31, the downshift point setting for the low load region: the method is characterized in that a downshift curve of a low-load region is set according to minimum vehicle speed intervals of an ascending line and a downshift line and equal delay;
step S32, obtaining a downshift curve in the medium and high load region: calculating the vehicle speed of a 100% accelerator pedal opening downshift point by looking up a table, and connecting the vehicle speed with a middle-low load boundary accelerator pedal opening downshift point to form a middle-high load downshift curve;
u downshift i+1→i ＝u upshift i→i+1 -α*Δt
wherein i is gear, u downshift i+1→i Is the speed of i +1 → i downshift at 100% accelerator pedal opening, u upshift i→i+1 The speed is the speed of an i → i +1 upshift under the condition of 100% of the accelerator pedal opening, alpha is the acceleration value of the intersection point of the acceleration curves of the i +1 gear and the i gear under the condition of 100% of the accelerator pedal opening, and delta t is the time interval of i → i +1 upshift point and i +1 → i downshift point under the condition of 100% of the accelerator pedal opening.
Further, in step S5, the off-line shift schedule evaluation includes the following steps:
s51: engine speed consistency evaluation
Calculating the rotation speed of the engine before and after the gear is shifted up under the opening of each gear and each accelerator pedal
Wherein n is before upshift For engine speed, n, before shifting after upshift For the engine speed after shifting, i is the gear, u i-i+1 For i-i +1 upshifts of speed, i 0 Is a main reduction ratio i i Is i-gear transmission ratio, i i+1 The transmission ratio of the i +1 gear is obtained, and r is the radius of the tire;
drawing a rotating speed change curve of the engine before and after each gear is shifted up under the opening of each accelerator pedal;
s52: evaluation of correlation between accelerator pedal opening and upshift of each gear
Evaluating the setting of a certain gear upshift point, and calculating the rotation speed of the upshift engine of the gear under each accelerator pedal opening degree by taking 10% as a step length to form a curve of upshift rotation speed-accelerator pedal opening degree and a target rotation speed curve;
s53: evaluation of downshift
And evaluating the setting of a downshift point of a certain accelerator pedal opening, converting a downshift line into a vehicle speed-acceleration curve, and drawing the vehicle speed-acceleration curve and an acceleration curve corresponding to the theoretically available torque of the engine in the gear on a graph.
The invention has the following beneficial effects:
the method can calibrate the gear shifting rule in the early stage before the sample vehicle comes out, effectively forwards the calibration work, and reliably guarantees the real-time performance and the rapidity of the gear shifting rule applied to the real vehicle; after the relevant parameters are updated, the updated gear shifting rule can be quickly obtained; the adjustment of the gear shifting rule can be intuitively analyzed and evaluated to improve the relevant drivability of the whole vehicle; the workload and the human resource input in the test calibration stage are reduced, and meanwhile, the gear shifting rule with the brand DNA characteristic is more favorably established.
Drawings
Fig. 1 is a flow chart of a shift schedule offline acquisition method according to the present invention;
FIG. 2 is a schematic diagram of a method for acquiring a shift point at 15% accelerator pedal opening in a low load region according to the method for acquiring a shift schedule offline of the present invention;
FIG. 3 is a schematic diagram of a method for obtaining a shift point at an accelerator opening of 40% in a medium load region in the method for obtaining a shift schedule offline according to the present invention;
fig. 4 is a schematic diagram of a downshift line acquisition method in a medium-high load area in the gear shift schedule offline acquisition method of the invention;
FIG. 5 is a schematic diagram of the engine speed before each gear is shifted up in the offline shift schedule obtaining method according to the present invention;
FIG. 6 is a schematic diagram of the engine speed after each gear is shifted up in the method for obtaining the gear shift schedule offline according to the present invention;
FIG. 7 is a schematic diagram illustrating evaluation of correlation between accelerator pedal opening and gear upshift in the off-line gear shifting schedule obtaining method according to the present invention;
fig. 8 is a schematic diagram of gear-shifting evaluation in the gear-shifting rule offline acquisition method of the invention.
Detailed Description
For the purpose of clearly describing the technical scheme of the present invention, the detailed working process and the embodiment of the present invention are further described in detail below with reference to the accompanying drawings.
S1: accelerator pedal opening zoning
The combined gear shifting rule is divided into a low-load area, a medium-load area and a high-load area according to the opening range of the accelerator pedal, and the gear shifting rule is formed by combining three sections of gear shifting curves with different changes, so that different vehicle performances can be obtained in different opening ranges of the accelerator pedal. The step refers to dividing the opening degree of an accelerator pedal into three regions of 0-30%, 30-80% and 80-100%. The invention relates to a gear shifting rule making principle, wherein a low-load region mainly takes economy as a main part, and a medium-high load region mainly takes dynamic property as a main part.
S2: upshift curve acquisition
S21: obtaining a low-load region upshift curve;
formulation principle of the gear shifting point in the low-load area: the vehicle is driven in a region where the fuel consumption of the engine is low as much as possible. Within the range of 0% -30% of pedal opening, 5% of equal step length is used for drawing the fuel consumption curve of each gear under a certain specific accelerator pedal opening according to universal characteristic data of the engine, wherein the abscissa is the vehicle speed, and the ordinate is the fuel consumption. Taking the accelerator opening of 15% as an example, the intersection of the fuel consumption curves of the respective gears is taken as the upshift points of the respective gears at the accelerator opening, as shown in fig. 2.
S22: obtaining a middle load area gear-up curve;
the gear shifting point of the middle load area is determined according to the principle: the shortest time it takes for a vehicle to accelerate from one vehicle speed to another according to a certain accelerator opening requires that the vehicle always travels according to the maximum acceleration during the gear shift.
Polynomial fitting is carried out according to a least square method, an engine torque curve is fitted, and the acceleration can be converted into a function of the opening degree of an accelerator pedal, the speed and the speed ratio through derivation of the following formula.
T tq ＝f(ap，n)
Wherein T is tq Ap is the engine torque, ap is the accelerator pedal opening, n is the engine speed, u is the vehicle speed, r is the tire radius, i g To the gear ratio of the corresponding gear, i 0 Is a main reduction ratio, F t As a driving force of the entire vehicle, F f As rolling resistance, F i As slope resistance, F w As air resistance, F j For acceleration resistance, η T For mechanical transmission efficiency, a is the current road slope angle, G is the vehicle gravity, mFor the mass of the entire vehicle, f 1 Is a coefficient of rolling resistance, C D Is the air resistance coefficient; a is the windward area, delta is the conversion coefficient of the rotating mass, and alpha is the acceleration of the vehicle
According to the derivation, the vehicle speed-acceleration curve of each gear can be made according to each specific accelerator pedal opening degree alpha; and drawing a vehicle speed-acceleration curve of each gear under each accelerator pedal opening by taking 10% of the accelerator pedal opening as a step length, taking an intersection point as an upshift point of each gear under the accelerator pedal opening, and taking the highest vehicle speed without the intersection point as a shift point, thereby obtaining the optimal acceleration. A vehicle speed-acceleration curve of each gear under the accelerator pedal is plotted with an accelerator pedal opening of 40%, an intersection point is taken as an upshift point of each gear under the accelerator pedal opening, and the highest vehicle speed without the intersection point is taken as a shift point, and the upshift point under the accelerator pedal opening is obtained, as shown in fig. 3.
S23: obtaining a high-load region upshift curve;
in order to prevent the over-rotation speed of the engine caused by the gear shifting delay, the rotation speed of the engine is reserved under the condition that the opening degree of an accelerator pedal of each gear is 100 percent, and the target value of the reserved rotation speed can be obtained by looking up a table 1; a shift point is set at the allowable maximum engine speed with the pedal opening of 100%, and is connected to the shift point at the accelerator opening of 80% determined in step S3 to form an upshift curve in the high load region.
TABLE 1
| Shifting | 1-2 | 2-3 | 3-4 | 4-5 | 5-6 |
| Reserved target value of rotation speed (rpm) | 1600 | 1000 | 800 | 600 | 600 |
S3: downshift curve acquisition
S31 downshift point setting in low load region
The downshift curve of the low-load region is set at the ascending and downshift line minimum vehicle speed intervals with equal delay.
S32 downshift curve acquisition in medium and high load region
Calculating the vehicle speed at the downshift point with the 100% accelerator pedal opening:
u downshift i+1→i ＝u upshift i→i+1 -α*Δt
wherein i is gear, u downshift i+1→i Is i +1 → i downshift speed u under 100% accelerator pedal opening upshift i→i+1 The vehicle speed is the vehicle speed of i → i +1 upshift under the condition of 100% of accelerator pedal opening, alpha is the acceleration value of the intersection point of the acceleration curves of i +1 gear and i gear under the condition of 100% of accelerator pedal opening, and delta t is the time interval of i → i +1 upshift point and i +1 downshift point under the condition of 100% of accelerator pedal opening, and the vehicle speed is obtained by looking up a table 2.
TABLE 2
| i | 1 | 2 | 3 | 4 | 5 |
| Δt(s) | 3.5 | 5 | 8 | 10 | 15 |
Taking the 2-1 downshift as an example, the downshift point at the 2-1 downshift and the accelerator pedal opening of 100% is found by the above method, and as shown in fig. 4, a medium-high load downshift curve is formed in connection with the downshift point at the accelerator pedal opening of 30% (determined in step S41).
And combining the downshift curves in the low-load region and the middle-high load region to form a downshift curve.
S4: synthesizing an upshift curve and a downshift curve into an offline shift schedule
S5: offline shift schedule evaluation
S51: engine speed consistency evaluation
Calculating the rotation speed of the engine before and after the gear is shifted up under the opening of each gear and each accelerator pedal
Wherein n is before upshift For engine speed, n, before shifting after upshift For the engine speed after shifting, i is the gear, u i-i+1 For i-i + 1 liter gear vehicleSpeed, i 0 Is a main reduction ratio i i For gear i, i i+1 The transmission ratio of the i +1 gear is obtained, and r is the radius of the tire.
And (3) drawing the change curves of the engine speeds before and after the gears are shifted up under the opening of each accelerator pedal, as shown in fig. 5 and 6, the closer the engine speeds before and after the gears are shifted and the more linear the engine speed increase after the gears are shifted under the same opening of the accelerator pedal, the better the consistency of the engine speeds is.
S52: evaluation of correlation between accelerator pedal opening and upshift of each gear
And evaluating the setting of a certain gear upshift point, calculating the engine speed of the upshift of the gear under each accelerator pedal opening degree by taking 10% as a step length, and forming a curve of the upshift speed and the accelerator pedal opening degree and a target speed curve, wherein as shown in FIG. 7, the closer to the target speed curve, the higher the correlation between the two curves is, and the better the drivability corresponding to the working conditions is.
S53: evaluation of downshift
And evaluating the setting of a downshift point of a certain accelerator pedal opening, converting a downshift line into a vehicle speed-acceleration curve, and drawing the curve and an acceleration curve corresponding to the theoretically available torque of the engine in the gear on a graph. Taking a 4-3 downshift as an example, as shown in fig. 8, the smaller the distance between the two curves is, the more sufficient the engine torque is utilized, whereas the problem of an early downshift is that the downshift point needs to be adjusted.
S6: and evaluating and optimizing to form a final offline gear shifting rule.
The invention discloses a method for quickly acquiring and evaluating a gear shifting rule of a hydraulic mechanical automatic transmission in an off-line manner, which is characterized in that the gear shifting rule which takes power performance and economy into consideration is acquired by an analytic method, evaluation and optimization are carried out on the driveability related to the gear shifting rule, the off-line optimal gear shifting rule is quickly acquired, calibration work is effectively moved forward, the workload and the human resource investment in the test calibration stage are reduced, and meanwhile, the gear shifting rule with brand DNA characteristics is more favorably established.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims. And those not described in detail in this specification are well within the skill of the art.
Claims (10)
1. A hydromechanical automatic transmission gear-shifting rule off-line obtaining and evaluating method is characterized by comprising the following steps:
s1: an accelerator pedal opening is partitioned;
s2: acquiring an upshift curve;
s3: obtaining a downshift curve;
s4: synthesizing an upshift curve and a downshift curve into an offline gear shifting rule;
s5: evaluating an offline gear shifting rule;
s6: and forming a final off-line gear shifting rule.
2. The hydromechanical automatic transmission shift schedule off-line acquisition and evaluation method according to claim 1, characterized in that:
in step S1, the accelerator pedal opening range division is divided into a low load region, a medium load region and a high load region according to an accelerator pedal opening range by using a combined shift schedule, and the shift schedule is formed by combining three different shift curves, so that different vehicle performances can be obtained in different accelerator pedal opening ranges.
3. The hydromechanical automatic transmission shift schedule off-line acquisition and evaluation method according to claim 2, characterized in that:
step S1 is to divide the accelerator pedal opening into three regions of 0-30%, 30-80%, 80-100%.
4. The method for acquiring and evaluating the shift schedule of the hydromechanical automatic transmission offline as recited in claim 3, wherein in said step S2, acquiring the upshift curves means acquiring the shift curves of three divisions in step S1; the method comprises the following steps:
step S21, a low load region upshift curve is obtained: the method is characterized in that the fuel consumption curves of specific accelerator pedal opening and various gears are drawn according to universal characteristic data of an engine in 5% equal step length within 0-30% of pedal range; taking an intersection point or an end point as a gear shifting point;
step S22, obtaining a mid-load region upshift curve: performing polynomial fitting according to a least square method, fitting an engine torque curve, converting acceleration into functions of accelerator pedal opening, vehicle speed and speed ratio through formula derivation, and making vehicle speed-acceleration curves of specific accelerator pedal opening and various gears; and drawing a vehicle speed-acceleration curve of each gear under each accelerator pedal opening by taking 10% of the accelerator pedal opening as a step length, taking an intersection point as an upshift point of each gear under the accelerator pedal opening, and taking the highest vehicle speed without the intersection point as a shift point, thereby obtaining the optimal acceleration.
5. The method for offline acquisition and evaluation of gearshift schedule of automatic hydromechanical transmission as claimed in claim 4, wherein in said step S2, acquiring the upshift curves means acquiring the shift curves of three divisions of step S1; further comprising the steps of:
step S23, a high load region upshift curve is obtained: the reserved target value of the rotation speed is obtained by a lookup table, a gear shifting point is set according to the allowed maximum engine rotation speed under the condition of 100% pedal opening, and the gear shifting point is connected with the gear shifting point under the condition of 80% accelerator opening determined in the step S3 to form an upshift curve in a high load area.
6. The hydromechanical automatic transmission shift schedule offline acquisition and evaluation method according to claim 5, wherein in step S3, the downshift curve acquisition means that downshift curves in a low load region and a high load region are obtained respectively; the method comprises the following steps:
step S31, the downshift point setting for the low load region: it is a downshift curve in which a low-load region is set with equal delay in the minimum vehicle speed interval of the upshift and downshift lines.
7. The hydromechanical automatic transmission shift schedule offline acquisition and evaluation method according to claim 6, wherein in step S3, the downshift curve acquisition means that downshift curves in a low load region and a high load region are obtained respectively; further comprising the steps of:
step S32, obtaining a downshift curve in the medium and high load region: calculating the vehicle speed of a 100% accelerator pedal opening downshift point by looking up a table, and connecting the vehicle speed with a middle-low load boundary accelerator pedal opening downshift point to form a middle-high load downshift curve;
u downshift i+1→i ＝u ups h ift i→i+1 -α*Δt
wherein i is gear, u downshift i+1→i Is i +1 → i downshift vehicle under 100% accelerator pedal opening
Fast u upshift i→i+1 The speed is the speed of an i → i +1 upshift under the condition of 100% of the accelerator pedal opening, alpha is the acceleration value of the intersection point of the acceleration curves of the i +1 gear and the i gear under the condition of 100% of the accelerator pedal opening, and delta t is the time interval of i → i +1 upshift point and i +1 → i downshift point under the condition of 100% of the accelerator pedal opening.
8. The hydromechanical automatic transmission shift schedule offline acquisition and evaluation method according to claim 7, wherein the offline shift schedule evaluation comprises the steps of:
s51: engine speed consistency evaluation
Calculating the rotation speed of the engine before and after the gear is shifted up under the opening of each gear and each accelerator pedal
Wherein n is before upshift For engine speed, n, before shifting after upshift For the engine speed after shifting, i is the gear, u i-i+1 For i-i +1 upshifts of speed, i 0 Is a main reduction ratio i i Is i-gear transmission ratio, i i+1 The transmission ratio of the i +1 gear is obtained, and r is the radius of the tire;
and drawing the change curves of the rotating speed of the engine before and after each gear is shifted up under the opening of each accelerator pedal.
9. The hydromechanical automatic transmission shift schedule offline acquisition and evaluation method according to claim 8, wherein the offline shift schedule evaluation further comprises the steps of:
s52: evaluation of correlation between accelerator pedal opening and upshift of each gear
And evaluating the setting of a certain gear upshift point, calculating the rotation speed of the upshift engine of the gear at each accelerator pedal opening degree by taking 10% as a step length, and forming a curve of the upshift rotation speed and the accelerator pedal opening degree and a target rotation speed curve.
10. The hydromechanical automatic transmission shift schedule offline acquisition and evaluation method of claim 9, wherein the offline shift schedule evaluation further comprises the steps of:
s53: evaluation of downshift
And evaluating the setting of a downshift point of a certain accelerator pedal opening, converting a downshift line into a vehicle speed-acceleration curve, and drawing the vehicle speed-acceleration curve and an acceleration curve corresponding to the theoretically available torque of the engine in the gear on a graph.
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