A creep mode temperature compensation speed regulation control method for wheel hub hydraulic drive system

Abstract

The invention provides a crawling mode temperature compensation speed regulation control system of a hub hydraulic driving system for solving the problems of temperature rise and disturbance of temperature change to control precision and the like of the hub hydraulic driving system when a vehicle is in a crawling mode, and belongs to a vehicle control system. The control system includes the stepsthat in the crawling mode, according to the speed regulation characteristics of a hydraulic system closed circuit, the hub hydraulic driving system is regarded as a hydraulic stepless speed regulationgear, the target is engine optimization, power transmission of a hydraulic circuit influenced by efficiency change of a pump and a motor due to changes of states such as the temperature and the pressure is considered, compensating factors are introduced, and thus hydraulic stepless speed regulation control is conducted. According to the crawling mode temperature compensation speed regulation control method, a temperature compensation module is added, thus the engine operating point is regulated to the optimal line, it is guaranteed that an engine works in a high efficiency area, the temperature adaptive capacity of the hub hydraulic driving system is improved, the bearing capacity of the system is improved, and meanwhile certain energy-saving effect is achieved.

Description

Technical field [0001] The present invention belongs to an automobile control system. More specifically, the present invention relates to a creeping mode control method of a wheel hub hydraulic drive system. Background technique [0002] Heavy-duty vehicles often run on poor roads such as mine roads, mud-snow roads, etc., which are prone to wheel slip and insufficient driving force. A set of wheel hub hydraulic motor auxiliary drive system is added to traditional heavy vehicles, and the hydraulic motor in the non-driven wheel hub is driven by the hydraulic pump for auxiliary drive, which can make the vehicle enter the four-wheel drive mode for a short time and improve the road surface with low adhesion coefficient. Traction performance and passability. The working environment of heavy-duty vehicles is complex and harsh, and they often need to move at low speeds. There may be extreme situations in which the mechanical transmission system of the vehicle cannot work normally, such ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of the temperature rise of the wheel hub hydraulic drive system and the interference of temperature changes on the control accuracy in the creep mode of the existing wheel hub hydraulic auxiliary drive vehicle system, and propose a wheel hub hydraulic drive system Temperature Compensation Speed ​​Regulation Control Method in Creep Mode

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