Dynamic variable speed optimization control method considering efficiency of HMT (hydraulic mechanical transmission)

A technology for optimizing control and transmission, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve the problem of not considering the influence of HMT transmission drive power, etc., to improve fuel economy and transmission efficiency. The effect of improving and reducing the cost of agricultural production

Inactive Publication Date: 2019-11-01
HEFEI UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The principle of formulating the optimal power control law of traditional continuously variable transmission vehicles is to make the engine work at the speed with the maximum output power at each throttle opening. This principle does not consider the effect of HMT transmission efficiency on driving power. influences

Method used

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  • Dynamic variable speed optimization control method considering efficiency of HMT (hydraulic mechanical transmission)
  • Dynamic variable speed optimization control method considering efficiency of HMT (hydraulic mechanical transmission)
  • Dynamic variable speed optimization control method considering efficiency of HMT (hydraulic mechanical transmission)

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Embodiment Construction

[0031] In this embodiment, a dynamic transmission optimization control method considering the efficiency of the HMT transmission, when the HMT transmission system is in a mechanical-hydraulic dual-flow transmission, in order to avoid the phenomenon of power cycling in the hydraulic circuit, the adjustment range of the pump displacement ratio is 0h <1; The specific method is as follows:

[0032] Step 1. Calculate the hydraulic power split ratio ρ of the transmission system of the HMT transmission according to formula (1) h :

[0033]

[0034] In formula (1), i 1 Input gear pair transmission ratio for hydrostatic transmission; i 2 Is the transmission ratio of the hydrostatic transmission output gear pair; i 3 Is the transmission ratio of the transfer shaft and the confluence shaft input gear pair; e is the displacement ratio of the hydraulic pump; K is the characteristic parameter of the confluence planetary gear train.

[0035] Step 2. Calculate the efficiency η of the hydraulic circui...

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Abstract

The invention discloses a dynamic variable speed optimization control method considering efficiency of an HMT (hydraulic mechanical transmission). The dynamic variable speed optimization control method considering the efficiency of the HMT includes: by calculating a hydraulic power split ratio rho<h> of an HMT drive system and efficiency of the HMT in mechanical-hydraulic double current driving, confirming a discharge ratio of a pump in the HMT drive system when the mechanical-hydraulic double current driving efficiency is maximum. By regulating the discharge ratio of the pump in the HMT drivesystem, the dynamic variable speed optimization control method considering the efficiency of the HMT enables the HMT drive system to keep working at the maximum driving efficiency moment all the timewhen the HMT drive system is in the mechanical-hydraulic double current driving, thereby improving dynamic performance of the HMT drive system.

Description

Technical field [0001] The invention relates to the technical field of tractor power shifting, in particular to a method for improving the mechanical-hydraulic dual-flow transmission efficiency of a HMT transmission transmission system to optimize power shift control. Background technique [0002] Unlike traditional road transport vehicles, tractors do not have fuel economy evaluation indicators. During the operation of the tractor, the operation quality is guaranteed and the operation is completed as quickly as possible. Therefore, the evaluation index of the tractor is only the productivity. When the purpose is to increase productivity, the basic requirement of the tractor hydraulic mechanical transmission (Hydraulic Mechanical Transmission, HMT) HMT continuously variable speed law is: to ensure the tractor output maximum power within the limited speed range in order to meet the quality of work. [0003] The driving power obtained by the tractor is determined by the engine outpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/42
CPCF16H61/42F16H2061/0015
Inventor 夏光张亮赵名卓石鹏许立平张洋高军杨猛李嘉诚滑杨莹
Owner HEFEI UNIV OF TECH
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