Control method for self-adaptively adjusting braking force of hydraulic braking road roller

Abstract

The invention discloses a control method for self-adaptively adjusting braking force of a hydraulic braking road roller, which comprises the following steps of: acquiring rigidity characteristics of a construction road surface in real time through a compactness detection radar, and adjusting the maximum braking force according to real-time road surface rigidity characteristic parameters; the number and distance of obstacles in the running direction of the vehicle are collected in real time through the obstacle detection radar, and the current vehicle speed is collected in real time through the steel wheel speed sensor. The displacement of the driving proportional pump and the displacement of the steel wheel driving proportional motor can be controlled and adjusted by integrating road surface rigidity characteristic parameters, the distance of an obstacle and the current vehicle speed, vehicle braking force is adjusted in a self-adaptive mode for speed reduction, and effective control over deceleration can be achieved by combining the rigidity characteristics of a construction road surface during braking; and therefore, the phenomena of non-uniform pavement compaction, paving layer pushing or upheaval and the like caused by overlarge inertia load are avoided, and the device is particularly suitable for the double-drum vibratory roller.

Description

technical field [0001] The invention relates to a braking control method for a road roller, in particular to a control method for adaptively adjusting the braking force of a hydraulic brake roller, belonging to the technical field of road rollers. Background technique [0002] The road roller is a heavy-duty construction machine used for road construction. It uses the gravity of the machine itself to permanently deform and compact the rolled layer. It is widely used in high-grade highways, railways, airport runways, dams, stadiums and other large-scale engineering projects. Square compaction work. Double-drum road roller generally refers to a double-drum vibratory road roller, which is a road roller that uses its own gravity and vibration to compact various road construction materials. It is widely used for compaction efficiency, and it is most suitable for compacting various non-cohesive soils, crushed stones, crushed stone mixtures and various asphalt concretes. [0003]...

AI Technical Summary

Problems solved by technology

In the prior art, a radar is usually installed on the tandem roller body to detect obstacles and implement braking alarms. Although the radar detection method can realize real-time feedback and real-time braking alarms, on the one hand, due to various The ratio of different road construction materials, the amount of high-viscosity binder added, and the thickness of the pavement will cause different physical properties of the mixed pavement, and the brake of the double-drum road roller is usually hydraulic brake, that is, the engine The high-pressure oil pumped out by the driving hydraulic pump drives the front and rear drums to travel respectively through two parallel travel hydraulic motors. When braking, the displacement of the hydraulic pump is zero, and the travel hydraulic motor is in pump mode, generating torque opposite to the rotation direction of the drums. The front and rear steel wheels are braked, and the braked steel wheels interact with the ground to achieve braking. That is to say, the braking speed of the double drum roller is mainly determined by the deceleration of the pump displacement of the walking hydraulic system The impact of the maximum braking force of the walking system and the ground adhesion. Therefore, for mixed material layers with different physical properties, if the deceleration is not properly controlled during the braking process, the inertial load will often be too large, which will lead to uneven compaction of the road surface. In severe cases, it may even cause the ply to push or wrap, and affect the quality of the final formed road surface; on the other hand, the handle of the road roller used to control the gear is usually directly connected to the hydraulic pump of the hydraulic brake of the road roller, usually when the handle is in the middle position The displacement of the hydraulic pump is zero and the road roller is in the braking state. The braking speed of the road roller is controlled by the speed at which the handle returns from the forward gear or the reverse gear to the neutral position, which causes the deceleration of the road roller during normal operation. The control often depends on the experience and emergency response ability of the roller driver

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