A secondary regulation system based on electric control

Abstract

The invention discloses a novel secondary regulation system based on electrical control. The novel secondary regulation system comprises a hydraulic energy accumulator, an electric quantity storage unit, a driving motor, a first motor / generator, a second motor / generator, a first motor controller, a second motor controller, an inverter, a first variable pump / motor, a second variable pump / motor, a reversing valve, a shuttle valve, a safety valve, a controller and the like. Conventional hydraulic transformers or proportional reversing valves are replaced by the variable pumps / motors and the motors / generators for matching the pressures and flows of a constant pressure source and a load in the secondary regulation system, the pressures of the hydraulic energy accumulator and the load are matched by regulating the displacement of the variable pumps / motors, and the speed of an actuator is controlled by regulating the rotation speed of the motors / generators; in addition, through the multi-quadrant operation of the motors / generators and the variable pumps / motors, the occasion where the pressure of the load is driven to be higher than that of the hydraulic energy accumulator is achieved, and the defects that a conventional secondary regulation system is difficult to adapt to the actuator which is linearly driven and the pressure of the load is difficult to drive to be higher than that of the hydraulic energy accumulator are overcome.

Description

technical field [0001] The invention relates to the technical field of drive systems, in particular to a secondary regulation system based on electrical control. Background technique [0002] In the face of global energy crisis, environmental pollution and other major problems, all kinds of machinery and equipment urgently need to cope with the pressure of energy conservation and environmental protection. The concept of green and environment-friendly machinery and equipment has gradually emerged, and efforts are being made to seek new solutions in technology. At present, the commonly used hydraulic system energy saving mainly includes several typical hydraulic control systems such as secondary adjustment technology, open center, load sensing, negative flow and positive flow control. Among them, the secondary regulation technology has already begun to be applied. [0003] As early as 1977, Professor Nikolaus of the University of Defense Technology in Hamburg, Germany, propos...

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Problems solved by technology

The hydraulic actuator in the constant pressure network is a hydraulic motor / pump with adjustable displacement, so this technology can be applied to the rotary drive, but because the speed control of the hydraulic pump / motor must be closed-loop control, due to the strong nonlinearity of the hydraulic system Features, the speed of the hydraulic pump / motor is difficult to control precisely, and there is a large impact at the moment of starting and braking

For a hydraulic cylinder that does linear motion, since the cross-sectional area of ​​the hydraulic cylinder cannot be changed, the secondary adjustment technology cannot be directly applied to a linear motion system.

The current researchers generally adopt the following two schemes: one adopts the method of connecting the hydraulic transformer to realize the matching of the constant voltage oil source and the variable voltage load for linear motion, but the introduction of the hydraulic transformer will make the system structure complicated, which is not conducive to the actual production application; the other is to use the proportional directional valve for direct control, but due to the mismatch between the pressure of the hydraulic accumulator and the load pressure, it will inevitably lead to a large amount of throttling loss on the valve port of the proportional directional valve. At the same time, this scheme The proportional reversing valve cannot be pressurized, and the pressure of the hydraulic accumulator is required to be higher than the load pressure

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