A variable pump displacement control method for a hub motor hydraulic drive system

Abstract

The invention relates to a displacement control method for a hub motor fluid power system variable pump, and belongs to an automobile control system. The revolving speed of front wheels follows the revolving speed of rear wheels. The displacement control method is mainly divided into static regulation and PI (proportional integral) regulation, wherein the static regulation comprises two steps of gear estimation and displacement table search; the table is directly searched according to the estimated gear to obtain a constant value displacement, i.e. the static displacement; the PI feedback regulation of the difference value of the front wheel speed and the rear wheel speed needs to be added to correct the static displacement. The displacement control method for the hub motor fluid power system variable pump has the advantages that the front wheel speed and the rear wheel speed of the automobile can be consistent under the control of the control method when the system is under the auxiliary driving working condition, and the trackslip efficiency of the whole automobile is optimal while the hub motor fluid power system is controlled to obviously improve the passage capacity of the whole automobile on a low-adhering road surface or a road surface with a big slope.

Description

technical field [0001] The invention belongs to an automobile control system, in particular to a method for controlling the displacement of a variable pump in a hub motor hydraulic drive system. Background technique [0002] Commercial vehicles, heavy trucks and engineering vehicles often encounter unsteady ground such as mine roads, country roads, construction sites, and slippery roads such as mud, ice and snow. Its adhesion coefficient is generally small, and occasionally has a large slope. The driving wheel of a traditional single-axle drive vehicle may slip under these conditions, and the vehicle's passability is poor. The all-wheel drive vehicle overcomes the shortcomings of the traditional single-axle drive vehicle, can effectively use the attached weight, obtain the maximum driving force, and obviously enhance its passing performance on bad roads. However, the working environment of general engineering vehicles is relatively complicated. Although there are sometimes...

AI Technical Summary

Problems solved by technology

However, the working environment of general engineering vehicles is relatively complicated. Although there are sometimes slippery roads or steep slopes, most of them are flat and good hard roads.

On good road conditions, all-wheel drive vehicles are not good enough in terms of speed and fuel economy.

Images