A speed regulation control method for dual-flow transmission system of wheeled tractor
The technology of a wheeled tractor and control method is applied in the field of research and design of vehicle speed change control, which can solve the problems of driving wheel slipping, discount of speed regulation effect, deterioration of driving wheel slipping rate, etc., so as to avoid driving wheel slipping, maintain production efficiency, and excellent The effect of speed regulation ability
Active Publication Date: 2021-06-08
HEFEI UNIV OF TECH
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Problems solved by technology
Existing speed regulation control for tractors equipped with hydraulic-mechanical dual-flow transmission systems often only considers the adjustment of the tractor's vehicle speed and ignores the control of the slip rate of the drive wheel, and does not take the slip rate and vehicle speed as a coupled whole to formulate corresponding Therefore, in the process of vehicle speed adjustment, it is easy to cause the deterioration of the slip rate of the driving wheel, and the phenomenon of slipping of the driving wheel will reduce the passability of the tractor and eventually lead to a decrease in the production efficiency of the tractor.
[0003] In addition, the existing technology does not take into account the influence of the transmission efficiency fluctuation of the hydraulic speed control branch on the transmission efficiency of the entire transmission system in the process of speed control of the hydraulic-mechanical dual-flow transmission system. The maximum output power of the engine is equal to the maximum driving power of the tractor driving wheels, which leads to a great reduction in the actual speed regulation effect
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[0113] image 3 It is a simplified diagram of the front-end module of the dual-flow transmission. By adjusting the HMT clutch L1, the HST clutch L2 and the displacement of the hydraulic pump in the front-end module, the transformation of the transmission mode of the dual-flow transmission can be realized. For example: combined with HMT clutch L1, disengaged from HST clutch L2, the hydraulic pump displacement is adjusted to 0, and the dual-flow transmission system is in a purely mechanical transmission state; combined with HMT clutch L1, disengaged from HST clutch L2, the hydraulic pump displacement is not 0, then When the double-flow transmission system is in the hydraulic-mechanical double-flow transmission state.
[0114] Assuming that the wheeled tractor equipped with the dual-flow transmission system is performing harvesting operations in purely mechanical transmission mode, suddenly, the operating resistance of the tractor increases sharply. If the speed control system de...
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The invention discloses a speed regulation control method for a wheeled tractor dual-flow transmission system. When the operation resistance of the tractor and the adhesion condition of the road surface change, the speed regulation control is divided into three stages by grading the tractor drive wheel slip rate. There are two different priorities: performance priority and production efficiency priority, and implement slip rate control and vehicle speed control respectively. The invention can determine the transmission mode of the dual-flow transmission system by grading the current working resistance of the tractor when controlling the speed of the vehicle, and adjust the speed according to the speed change law of the highest productivity, thereby maintaining the production efficiency of the tractor to the maximum extent.
Description
technical field [0001] The invention relates to the field of vehicle speed control research and design, in particular to a speed control method for a wheeled tractor dual-flow transmission system. Background technique [0002] Different from the fuel economy requirements of passenger cars, tractors pay more attention to the production efficiency of the unit. During the operation of the tractor, the slip rate of the driving wheel and the speed of the tractor will affect the production efficiency of the tractor. Existing speed regulation control for tractors equipped with hydraulic-mechanical dual-flow transmission systems often only considers the adjustment of the tractor's vehicle speed and ignores the control of the slip rate of the drive wheel, and does not take the slip rate and vehicle speed as a coupled whole to formulate corresponding Therefore, in the process of vehicle speed adjustment, it is very easy to cause the slip rate of the driving wheel to deteriorate, and ...
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IPC IPC(8): B60W30/18B60W40/105B60W40/10
CPCB60W30/18172B60W40/10B60W40/105B60W2300/152B60W2720/10
Inventor 夏光纵华宇高军于星海张亮王跃强李嘉诚夏岩陈建杉
Owner HEFEI UNIV OF TECH