Method for optimizing gear-shift schedule of vehicle based on dynamic programming algorithm

A dynamic programming algorithm, a technology for car shifting, applied in the direction of instruments, adaptive control, control/regulation systems, etc., can solve the problem of weakening the overall performance of the car

Active Publication Date: 2018-07-27
CHANGCHUN UNIV OF TECH
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Problems solved by technology

The shift schedule obtained by using a performance as the opt

Method used

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  • Method for optimizing gear-shift schedule of vehicle based on dynamic programming algorithm
  • Method for optimizing gear-shift schedule of vehicle based on dynamic programming algorithm
  • Method for optimizing gear-shift schedule of vehicle based on dynamic programming algorithm

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Embodiment Construction

[0049] Below in conjunction with the accompanying drawings, the present invention will be further described by taking the comprehensive performance optimal shift schedule of a 5-speed electronically controlled mechanical automatic transmission (AMT) of a certain type of traditional passenger car as a specific embodiment.

[0050] 1. Construction of car model

[0051] Car linear dynamics model:

[0052] T tq =(mgfcosα+mgsinα+C d Sv 2 / 21.15+δmdv / (dt))r (1)

[0053] Car speed:

[0054] v=0.377rn / (i g i o ) (2)

[0055] In the formula, T tq is the driving torque of the engine, the unit is Nm; the vehicle mass m, the unit is kg; g is the gravity acceleration, the unit is m / s 2 ; f rolling resistance coefficient; α is the ramp angle; C d is the air resistance coefficient; S is the windward area of ​​the car, m 2 ; v is the vehicle speed, the unit is m / s; dv / dt is the vehicle acceleration, the unit is m / s 2 ; δ is the conversion factor of the car's rotating mass; r is th...

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Abstract

The invention discloses a method for optimizing the gear-shift schedule of a vehicle based on a dynamic programming algorithm, and belongs to the technical field of automotive automatic transmissions.In order to optimize the vehicle gear-shift decision that satisfies fuel economy without losing dynamic property, the invention aims to propose a method for optimizing the gear-shift schedule of a vehicle based on a dynamic programming algorithm. The method of the invention includes the steps of establishing an engine fuel consumption characteristic map according to the measured data of an engine; importing a gear optimal sequence of various cyclic working conditions solved in the first step into an AMEsim vehicle simulation model that has been built; printing the corresponding throttle opening and vehicle speed obtained in the second step and the gear data solved in the first step under the three cyclic working conditions into the same figure by using the MATLAB; building a gear-shift logic control module on an MATLAB/SIMLINK platform; formulating an economy based gear-shift schedule and a dynamic property based gear-shift schedule respectively according to the same vehicle parameters in Table 1 in the second step; and finally, performing optimization to obtain a gear-shift schedule curve that satisfies both the dynamic property and the fuel economy. The invention has the characteristics of simple structure, easy implementation, and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of automatic transmissions for automobiles, and relates to a method for optimizing shift schedules of automobiles based on a dynamic programming algorithm (DP). Background technique [0002] The development of automobiles is currently in the stage of automatic control, from the individual control of each assembly to the integrated comprehensive control of the power transmission system, from general control to intelligent and networked control. As an important part of automobile power transmission, automatic transmission control research is especially critical. Automobile automatic transmissions currently include hydraulic automatic transmissions (AT), electromechanical automatic transmissions (AMT), dual-clutch automatic transmissions (DCT) and continuously variable transmissions (CVT). The gear shifting rule, one of the core technical links of automatic transmission, refers to the rule that the gear positi...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 卢晓晖李哲马腾姜雨朱小泉
Owner CHANGCHUN UNIV OF TECH
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