Excitation self-adjusting extremum searching controller for continuously variable transmission and construction method
A continuously variable transmission and construction method technology, applied in the direction of adaptive control, general control system, transmission control, etc., to achieve the effect of solving influence, improving stability and improving efficiency
Active Publication Date: 2018-12-07
HUNAN UNIV
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[0004] The purpose of the present invention is to provide an excitation self-adjusting extreme value search controller and construction method for continuously variable transmission, so as to solve the technical defects existing in the prior art
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[0041] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.
[0042] The construction method of the excitation self-adjusting extremum search controller for the continuously variable transmission proposed by the present invention firstly needs to keep the pressure of the active valve as a fixed value, adjust the initial driven valve pressure according to a certain step length, and record the starting value of each adjustment from The control current of the driven valve establishes the relationship between the controlled current of the driven valve and the initial driven valve pressure. The specific operation is: keep the pressure of the hydraulic pump at 3MPa, and this value can be adjusted according to actual needs. Let the pressure of the driven valve change from 0.1 MPa to 3 MPa in an adjustment step of 0.1...
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The invention discloses a construction method of an excitation self-adjusting extremum searching controller for a continuously variable transmission in the field of continuously variable transmissioncontrol. The method comprises the following steps that an initial pressure value of a follow-up valve of the continuously variable transmission is obtained, and an excitation generator is establishedby taking a theoretical pressure value and the initial pressure value as input signals; an output signal of the excitation generator is obtained, and a pressure band-pass filter and a speed-ratio band-pass filter are established respectively; an output alternating component of the pressure band-pass filter and an output alternating component of the speed-ratio band-pass filter serve as input signals to establish a low pass filter, and an output signal of the low pass filter serves as an input signal to establish an integrator; an output signal value of the integrator and an instant pressure value of the follow-up valve are obtained, and if the instant pressure value is convergent, the excitation self-adjusting extremum searching controller is established; otherwise, the instant pressure value is corrected according to the output signals, the corrected pressure value serves as the initial pressure value of the follow-up value, and then all the above-mentioned steps are repeated till theinstant pressure value is convergent.
Description
technical field [0001] The invention relates to the field of continuously variable transmission control, and specifically discloses an excitation self-adjusting extreme value search controller for a continuously variable transmission and a construction method. Background technique [0002] The low efficiency of the CVT is due to the excessive clamping force of the metal belt to avoid slipping when encountering road resistance. However, excessive clamping force will not only reduce the transmission efficiency of the CVT, but also increase the loss of the hydraulic system. At present, an extremum search algorithm has been proposed abroad, which can make its clamping force approach the optimal clamping force without additional displacement sensors, so as to improve transmission efficiency. [0003] The steady-state oscillation of the extreme value search algorithm has an impact on the vehicle transmission system, which reduces the stability of the controller, resulting in a dec...
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Login to View More IPC IPC(8): F16H61/02G05B13/02
CPCF16H61/0251G05B13/024
Inventor 张飞铁方赞斌王亚平赵宏亮谢浩
Owner HUNAN UNIV