CN110108499B - Comprehensive testing method for gear shifting rule of automatic transmission - Google Patents
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- 238000012113 quantitative test Methods 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 5
- 238000011158 quantitative evaluation Methods 0.000 abstract 3
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a comprehensive evaluation method for a gear shifting rule of an automatic transmission, which is used for carrying out comprehensive quantitative evaluation on the economical efficiency and the dynamic property of the gear shifting rule 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 for evaluating the quality of the gear shifting rule of the automatic transmission, thereby providing an important basis for ensuring the vehicle performance.
Description
Technical Field
The invention belongs to the technical field of control of automatic transmissions of passenger vehicles, and relates to a comprehensive test method for a gear shifting rule of an automatic transmission, in particular to a comprehensive quantitative test method for the economical efficiency and the dynamic property of the gear shifting rule of the automatic transmission.
Background
The automatic transmission has the advantages of automatic gear shifting, simple driving operation and the like, and is more and more widely applied to the field of passenger vehicles. The rationality of gear selection has a great influence on the performance of the whole vehicle, and the technology related to the work is the test of the gear shifting rule. The gear shifting rule is a rule that the automatic gear shifting time of two adjacent gears changes along with control parameters in the running process of a vehicle, namely, the relationship between gears and control parameters at the gear shifting time, and currently, a two-parameter control method of vehicle speed and accelerator pedal opening is widely applied, namely, an automatic transmission selects corresponding gears according to the conditions of the vehicle speed and the accelerator pedal opening. The gear shifting rule is closely related to the economy and the dynamic property of the whole vehicle, and the quality of the economy and the dynamic property of the gear shifting rule is an important performance index of the whole vehicle. However, few studies are made on quantitative tests of the economy and the dynamic performance of the shift schedule at present, and therefore, a comprehensive quantitative test method for the economy and the dynamic performance of the shift schedule needs to be provided urgently.
Disclosure of Invention
In view of the few researches on the conventional testing method for the economy and the dynamic property of the shift schedule of the automatic transmission, the invention aims to provide a comprehensive testing method for the shift schedule of the automatic transmission, which is used for testing the quality of the economy and the dynamic property of the shift schedule of the automatic transmission.
The purpose of the invention is realized by the following technical scheme:
a comprehensive test method for a gear shifting rule of an automatic transmission comprises the following steps:
measuring specific oil consumption and vehicle acceleration of each vehicle speed point under different gears and different accelerator pedal opening degrees respectively;
secondly, making an optimal economical gear shifting rule according to the specific oil consumption characteristics measured in the step I;
thirdly, making an optimal dynamic gear shifting rule according to the acceleration characteristic measured in the first step;
calculating reference parameters for quantifying test results according to the optimal economical gear shifting rule measured in the step II and the optimal dynamic gear shifting rule measured in the step III, wherein the reference parameters comprise: the optimal economic parameter, the worst dynamic parameter, the optimal dynamic parameter and the worst economic parameter;
and fifthly, calculating the economic index and the dynamic index of the gear shifting rule to be tested according to the reference parameters of the quantitative test result calculated in the step (IV).
Further, in the step (i), the specific fuel consumption and the vehicle acceleration of the vehicle are measured in three dimensions of a gear, an accelerator pedal opening and a vehicle speed respectively.
Furthermore, in the second step, an intersection point of the same accelerator pedal opening and the fuel consumption curves of adjacent gears is taken as an ideal economical gear shifting point; and if no intersection point exists, taking the minimum point of the vehicle speed of the higher gear in the adjacent gears as an ideal economic gear shifting point.
Furthermore, in the third step, the intersection point of the acceleration curves of the same accelerator pedal opening and the adjacent gears is taken as an ideal dynamic gear shifting point; and if no intersection point exists, taking the maximum point of the vehicle speed of the lower gear in the adjacent gears as an ideal dynamic gear shifting point.
Furthermore, in the fifth step, the economical and dynamic indexes of the shift schedule of the automatic transmission are calculated by the following formula:
the dynamic index calculation formula of the gear shifting rule to be tested is as follows:
an economic index calculation formula of the gear shifting rule to be tested is as follows:
the smaller the dynamic index and the economic index of the gear shifting rule to be tested are, the better the corresponding performance is represented.
The invention has the following beneficial effects:
the testing method provided by the invention can quantitatively test the economy and the dynamic property of the whole gear shifting rule, and the smaller the index value calculated by the formula is, the better the corresponding performance is, the smaller the index value is, the important index for testing the goodness and badness of the gear shifting rule of the automatic transmission can be used as an important index for testing the performance of the whole vehicle, and an important basis is provided for ensuring the performance of the whole vehicle.
Drawings
FIG. 1 illustrates ideal economy shift points as described in the present invention;
FIG. 2 illustrates ideal powershift points as described in the present disclosure;
FIG. 3 is a graph of an optimal economy shift schedule as described in the present invention;
FIG. 4 is a graphical illustration of an optimal sporty shift schedule as described in the present invention;
FIG. 5 illustrates the best economics and worst dynamics parameters set forth in the present invention;
FIG. 6 shows the best dynamics and worst economics parameters described in the present invention;
FIG. 7 shows the dynamics and worst economics parameters to be tested as described in the present invention;
fig. 8 shows the results of the economic and dynamic quantitative calculations described in the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a comprehensive testing method for a gear shifting rule of an automatic transmission, which is characterized in that an optimal economic gear shifting rule and an optimal dynamic gear shifting rule are respectively formed according to the principles of minimum specific oil consumption and maximum acceleration, reference parameters of quantitative tests of economy and dynamic are calculated on the basis of the optimal economic and dynamic gear shifting rules, parameters of economy and dynamic of the gear shifting rule to be tested are calculated, and quantitative tests of economy and dynamic of the gear shifting rule are formed by using an index calculation formula.
A comprehensive test method for a gear shifting rule of an automatic transmission comprises the following steps:
a. the method comprises the following steps of starting a vehicle on site, fixing a gear, fixing the opening of an accelerator pedal, and measuring the specific oil consumption and the vehicle acceleration of each vehicle speed point;
b. repeating the step a to obtain specific oil consumption and vehicle acceleration of each vehicle speed point with different gears and different accelerator pedal opening degrees;
c. b, drawing the specific oil consumption of each vehicle speed point of different gears and different accelerator pedal opening degrees obtained in the step b on a graph, taking the intersection point of curves of the same accelerator pedal opening degree and the specific oil consumption of adjacent gears as an ideal economical gear shifting point, taking the minimum point of the vehicle speed of the higher gear in the adjacent gears without the intersection point as an ideal economical gear shifting point, and connecting the economical gear shifting points of the same adjacent gears into a line to form an optimal economical gear shifting rule;
d. b, making the acceleration of each vehicle speed point with different gears and different accelerator pedal opening degrees obtained in the step b on a graph, taking the intersection point of acceleration curves of the same accelerator pedal opening degree and adjacent gears as an ideal dynamic gear shifting point, taking the maximum point of the vehicle speed of a lower gear in the adjacent gears as an ideal dynamic gear shifting point without the intersection point, and connecting the dynamic gear shifting points of the same adjacent gears into a line to form an optimal dynamic gear shifting rule;
e. and c, starting the vehicle on site, fixing the opening degree of an accelerator pedal, selecting the optimal economical gear shifting rule obtained in the step c, and shifting the gear to accelerate to the selected speed. Calculating the average specific oil consumption of the acceleration process as the optimal economic parameter, ECO for shortBest(ii) a Calculating the acceleration time of the acceleration process as the worst dynamic property parameter, referred to as DYN for shortWorst。
f. And d, starting the vehicle on site, fixing the opening degree of an accelerator pedal, selecting the optimal dynamic gear shifting rule obtained in the step d, and shifting the gear to accelerate to the selected speed. Calculating the acceleration time of the acceleration process as the optimal dynamic parameter, named DYN for shortBest(ii) a Compute accelerationThe average specific fuel consumption of the process is taken as the worst economic parameter, ECO for shortWorst；
g. The vehicle is started in situ, the opening degree of an accelerator pedal is fixed, and a gear shifting rule to be tested is selected to accelerate to a selected speed. Calculating the acceleration time of the acceleration process as the dynamic parameter to be tested, referred to as DYN for shortNow(ii) a Calculating the average specific oil consumption of the acceleration process as the economic parameter to be tested, ECO for shortNow；
h. An economic index calculation formula of the gear shifting rule to be tested is as follows:
i. the dynamic index calculation formula of the gear shifting rule to be tested is as follows:
j. and (e) repeating the steps f to h to obtain the economic index and the dynamic index of the gear shifting rule to be tested with different accelerator pedal opening degrees, wherein the smaller the index values of the dynamic index and the economic index are, the better the corresponding performance is represented, and the economic performance and the dynamic performance quantitative test of the whole gear shifting rule is completed.
Example 1
a. The vehicle starts in situ, the fixed gear is 2, the opening of the fixed accelerator pedal is 30%, and the specific oil consumption and the vehicle acceleration of each vehicle speed point are measured;
b. the vehicle starts in situ, the fixed gear is 3, the opening of the fixed accelerator pedal is 30%, and the specific oil consumption and the vehicle acceleration of each vehicle speed point are measured;
c. the specific oil consumption of each vehicle speed of the 30% accelerator pedal opening 2 gear and the 3 gear obtained in the step a and the step b is made on a graph, the intersection point of the specific oil consumption curves of the same accelerator pedal opening and the adjacent gears is taken as an ideal economical gear shifting point, and the minimum point of the vehicle speed of the higher gear in the adjacent gears without the intersection point is taken as an ideal economical gear shifting point, as shown in the attached graph 1;
d. b, making the vehicle acceleration of each vehicle speed of the 2-gear and the 3-gear with 30% of accelerator pedal opening obtained in the step a and the step b on a graph, taking the intersection point of acceleration curves of the same accelerator pedal opening and adjacent gears as an ideal dynamic gear shifting point, and taking the maximum point of the vehicle speed of the lower gear in the adjacent gears as an ideal dynamic gear shifting point without the intersection point, as shown in the graph 2;
e. repeating the steps a, b and c to obtain ideal economic gear shifting points of gears with the opening degrees of the accelerator pedal of 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and connecting the gear shifting points of the gears into a curve to form an optimal economic gear shifting law by taking the vehicle speed as an abscissa and the accelerator pedal as an ordinate, as shown in fig. 3;
f. repeating the steps a, b and d to obtain ideal dynamic gear shifting points of gears with the opening degrees of the accelerator pedal of 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and connecting the gear shifting points of the gears into a curve to form an optimal dynamic gear shifting law by taking the vehicle speed as an abscissa and the accelerator pedal as an ordinate, as shown in fig. 4;
g. and (5) starting the vehicle in situ, fixing the opening degree of an accelerator pedal, selecting the optimal economical gear shifting rule obtained in the step e to shift gears, and accelerating the vehicle until the current opening degree of the accelerator pedal can reach 90% of the maximum vehicle speed. Calculating the average specific oil consumption of the acceleration process as the optimal economic parameter, ECO for shortBest(ii) a Calculating the acceleration time of the acceleration process as the worst dynamic property parameter, referred to as DYN for shortWorst。
h. And repeating the step g to obtain the optimal economic performance parameters and the worst dynamic performance parameters of the accelerator pedal opening degree of 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, as shown in FIG. 5.
i. And e, starting the vehicle on site, fixing the opening degree of an accelerator pedal, selecting the optimal dynamic gear shifting rule obtained in the step f to shift gears, and accelerating to the same speed in the step g. Calculating the acceleration time of the acceleration process as the optimal dynamic parameter, named DYN for shortBest(ii) a Calculating the average specific oil consumption of the acceleration process as the worst economic parameter, ECO for shortWorst；
j. And repeating the step i to obtain the optimal dynamic parameters and the worst economic parameters of the opening degree of the accelerator pedal of 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, as shown in FIG. 6.
k. And g, starting the vehicle on site, fixing the opening degree of an accelerator pedal, and accelerating to the same speed in the step g by using a gear shifting rule to be tested. Calculating the acceleration time of the acceleration process as the dynamic parameter to be tested, referred to as DYN for shortNow(ii) a Calculating the average specific oil consumption of the acceleration process as the economic parameter to be tested, ECO for shortNow；
Repeating the step k to obtain dynamic parameters to be tested and economic parameters to be tested with the opening degrees of the accelerator pedals of 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, as shown in FIG. 7;
m. an economic index calculation formula of the gear shifting rule to be tested:
n, a power performance index calculation formula of the gear shifting rule to be tested:
repeating the steps of m and n to obtain the economic index and the dynamic index of the gear shifting rule to be tested with different opening degrees of the accelerator pedal, as shown in FIG. 8; the smaller the index values of the dynamic index and the economic index are, the better the corresponding performance is represented.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A comprehensive test method for a gear shifting rule of an automatic transmission is characterized by comprising the following steps of:
measuring specific oil consumption and vehicle acceleration of each vehicle speed point under different gears and different accelerator pedal opening degrees respectively;
secondly, making an optimal economical gear shifting rule according to the specific oil consumption characteristics measured in the step I;
thirdly, making an optimal dynamic gear shifting rule according to the acceleration characteristic measured in the first step;
calculating reference parameters for quantifying test results according to the optimal economical gear shifting rule measured in the step II and the optimal dynamic gear shifting rule measured in the step III, wherein the reference parameters comprise:
calculating the average specific oil consumption of the acceleration process using the optimal economic gear shifting rule as an optimal economic parameter;
calculating the acceleration time of the acceleration process using the optimal economical gear shifting law as the worst dynamic parameter;
calculating the acceleration time of the acceleration process using the optimal dynamic shift schedule as an optimal dynamic parameter;
calculating the average specific oil consumption of the acceleration process using the optimal dynamic gear shifting rule as the worst economic parameter;
and fifthly, calculating the economic index and the dynamic index of the gear shifting rule to be tested according to the reference parameters of the quantitative test result calculated in the step (IV).
2. The method for comprehensively testing the gear shifting rule of the automatic transmission according to claim 1, wherein in the step (r), the specific oil consumption and the acceleration of the vehicle are measured in three dimensions of gear, accelerator pedal opening and vehicle speed respectively.
3. The comprehensive test method for the gear shifting rule of the automatic transmission according to claim 1, wherein in the second step, the intersection point of oil consumption curves of the same accelerator pedal opening and adjacent gears is taken as an ideal economical gear shifting point; and if no intersection point exists, taking the minimum point of the vehicle speed of the higher gear in the adjacent gears as an ideal economic gear shifting point.
4. The method for comprehensively testing the gear shifting schedule of the automatic transmission according to claim 1, wherein in the step three, the intersection point of acceleration curves of the same accelerator pedal opening and the adjacent gears is taken as an ideal dynamic gear shifting point; and if no intersection point exists, taking the maximum point of the vehicle speed of the lower gear in the adjacent gears as an ideal dynamic gear shifting point.
5. The method for comprehensively testing the shift schedule of the automatic transmission according to claim 1, wherein in the fifth step, the economic and dynamic indexes of the shift schedule of the automatic transmission are calculated by the following formulas:
the dynamic index calculation formula of the gear shifting rule to be tested is as follows:
an economic index calculation formula of the gear shifting rule to be tested is as follows:
in the formula, DYNNowThe acceleration time of the acceleration process using the gear shifting rule to be tested, namely the dynamic parameter to be tested;
DYNWorstthe acceleration time of the acceleration process for which the best economy shift schedule is used, i.e. the worst dynamics parameter;
DYNBestthe acceleration time of the acceleration process for which the optimal dynamic shift schedule is used, i.e., the optimal dynamic parameter;
ECONowthe method comprises the following steps of (1) using the average specific oil consumption of the acceleration process of the gear shifting rule to be tested, namely an economic parameter to be tested;
ECOWorstaverage specific fuel consumption for acceleration processes using optimal dynamic shift schedules, i.e. worstAn economic parameter;
ECOBestthe average specific fuel consumption of the acceleration process, i.e. the optimal economy parameter, for which the optimal economy shift schedule is used.
6. The comprehensive test method of the shift schedule of the automatic transmission according to claim 5, characterized in that: the smaller the dynamic index and the economic index of the gear shifting rule to be tested are, the better the corresponding performance is represented.
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| CN111810624B (en) * | 2020-06-30 | 2022-02-18 | 中国第一汽车股份有限公司 | Gear shifting rule determination method and vehicle |
| CN113029588A (en) * | 2021-02-19 | 2021-06-25 | 东风汽车集团股份有限公司 | Automobile acceleration dynamic property evaluation method and system |
| CN112943914B (en) * | 2021-03-16 | 2022-03-18 | 一汽解放汽车有限公司 | Vehicle gear shifting line determining method and device, computer equipment and storage medium |
| CN114863587A (en) * | 2022-04-29 | 2022-08-05 | 一汽奔腾轿车有限公司 | Method for offline acquisition and evaluation of gear shifting rule of hydraulic mechanical automatic transmission |
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