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Dynamic evaluation method of vehicle acceleration characteristic and acceleration control method

A technology of acceleration control and dynamic evaluation, applied in the direction of electric speed/acceleration control, etc., can solve the problems of delay, control process error, large control error and effect, etc.

Inactive Publication Date: 2019-02-15
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the intelligent control decision-making schemes directly control the vehicle with a fixed control quantity input; in this way, when the acceleration characteristics of the vehicle are greatly different from the acceleration characteristics during calibration, it will lead to large control errors and effects.
In addition, part of the intelligent control scheme is to obtain the acceleration characteristics of the current vehicle with a certain output first, and then further accurately control the output of the control quantity. Although this scheme has made some progress compared with the previous fixed control quantity output, However, the trial process will lead to a certain delay. When the vehicle is running at high speed, it will have a large error and effect on the control process.

Method used

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  • Dynamic evaluation method of vehicle acceleration characteristic and acceleration control method
  • Dynamic evaluation method of vehicle acceleration characteristic and acceleration control method
  • Dynamic evaluation method of vehicle acceleration characteristic and acceleration control method

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Experimental program
Comparison scheme
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Embodiment 1

[0051] A dynamic evaluation method of vehicle acceleration characteristics, which is used for dynamically adjusting the corresponding relationship between the variable speed control amount and acceleration according to the current acceleration characteristics, so as to establish an accurate acceleration characteristic database.

[0052] In this embodiment, the speed change control amount refers to a control means to change the vehicle speed by taking measures of accelerator or brake, so the speed change control amount may include the accelerator control amount and / or brake control amount of the vehicle. The control amount is preferably a percentage parameter, and the percentage parameter represents the ratio of the current control amount to the maximum throttle or the maximum brake.

[0053] The acceleration characteristic database is a database used to reflect the mapping relationship between the variable speed control amount and the acceleration, and the mapping relationship ...

Embodiment 2

[0074] As the optimization of embodiment 1, the difference between this embodiment and embodiment 1 is: as image 3 As shown, in order to improve the accuracy of the acceleration characteristic database quantity and the sample size in this embodiment, the construction of the acceleration characteristic database includes the following steps:

[0075] The actual acceleration and the speed change control amount in the second specific time period are collected, and the collected actual acceleration and speed change control amount are continuous and multiple. The second specific time period may be, but not limited to, any value from 1s to 4s, so as to ensure the accuracy of data collection. Theoretically, the longer the second specific time period is, the higher the accuracy rate is, but the more difficult it is to collect.

[0076] Judging whether the collected actual acceleration rate of change is less than the first preset value, in order to ensure the efficiency of data collec...

Embodiment 3

[0081] As the optimization of embodiment 1, the difference between this embodiment and embodiment 2 is: as Figure 4 As shown, step S20 of this embodiment includes the following sub-steps:

[0082] S21. Obtain the current variable speed control amount , to retrieve the current variable speed control amount Whether there is completely corresponding data in the acceleration characteristic database, and if so, directly obtain the corresponding ideal acceleration , otherwise it is obtained by calculation, specifically refer to step S22 and step S23.

[0083] S22. According to the size of the current variable speed control amount, take the first calculated control amount larger than the current variable speed control amount in the acceleration characteristic database and a second calculation control amount smaller than the current shift control amount ;

[0084] S23. Obtaining the first calculated control quantity , the second calculated control quantity Corresponding...

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Abstract

The invention relates to a dynamic evaluation method of vehicle acceleration characteristic, comprising the following steps of: S10, obtaining an actual variable speed control amount P and an actual acceleration a of a vehicle; S20, calculating an ideal acceleration a<e> corresponding to the actual variable speed control amount P in the established acceleration characteristic database; S30, calculating an equivalent ratio change rate r of the actual acceleration a and the ideal acceleration a<e>, and correcting the data in the database. Meanwhile, the invention also provides a vehicle acceleration control method based on the dynamic evaluation method. The invention has the advantages that the precise correspondence between the control amount and the acceleration is greatly improved by establishing a dynamic acceleration characteristic database, monitoring the mapping relation between the variable speed control amount and the acceleration of the vehicle in real time, and performing the global real-time correction on the database. During the intelligent control, the braking effect or the acceleration effect is more accurate, the output control amount of the current vehicle can be estimated according to the target acceleration, and the intelligent precise control level is improved.

Description

technical field [0001] The invention relates to the field of intelligent driving and ADAS intelligent assisted driving systems, in particular to a dynamic evaluation method and an acceleration control method of vehicle acceleration characteristics. Background technique [0002] With the continuous development of smart technology, smart vehicles and even unmanned vehicles have gradually entered our lives. The acceleration of the vehicle is one of the important characteristics that characterize the motion state of the vehicle. In the application process of vehicle intelligence, the acceleration is an irreplaceable calculation basis. Therefore, the acceleration characteristics of vehicles play an increasingly important role on the road to intelligent vehicles. [0003] The acceleration characteristics of the vehicle directly affect the motion control performance of the vehicle. In the process of intelligent application of vehicles, it is often necessary to estimate the contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D13/62
CPCG05D13/62
Inventor 张耿旭
Owner HUIZHOU DESAY SV AUTOMOTIVE