Valve controlled regulating system without throttling loss based on PWM (pulse-width modulation) and regulating method thereof

Abstract

The invention relates to a valve controlled regulating system without throttling loss based on PWM (pulse-width modulation) and a regulating method of the regulating system, belonging to the technical field of hydraulic control. The system comprises a three phase alternating current asynchronous motor, a constant delivery pump, a single-way valve, a high-speed switching valve, a two-way cartridge valve, an energy accumulator, a relief valve and a regulating throttling valve, wherein a non-throttling valve controlled unit is formed by the high-speed switching valve and the two-way cartridge valve; a P opening of the high-speed switching valve is communicated with an outlet of the constant delivery pump; an A opening of the high-speed switching valve is communicated with a control chamber of the two-way cartridge valve; a T opening of the high-speed switching valve is communicated with an oil tank; the three phase alternating current asynchronous motor drives the constant delivery pump; an outlet of the constant delivery pump is communicated with the single-way valve; an outlet of the single-way valve is simultaneously communicated with inlets of the relief valve, the energy accumulator and the two-way cartridge valve; and an outlet of the two-way cartridge valve is communicated with the regulating throttling valve. The valve controlled regulating system solves the problems that the traditional hydraulic valve controlled system in the prior art has high throttling loss, lower system efficiency, slow response speed of positive displacement control mode, has high requirements on a motor and a pump, high cost and complex control mode and the like.

Description

technical field [0001] The present invention relates to a device and method in the technical field of hydraulic control, in particular to a PWM-based valve-controlled adjustment system without throttling loss and an adjustment method thereof. Background technique [0002] The control modes of the hydraulic control system mainly include throttling control mode and volumetric control mode. The throttling control system has the advantages of fast response speed and high control precision, but there are a lot of throttling losses and overflow losses, the efficiency of the entire control system is very low, and the temperature rise of the overflow hydraulic oil increases, which accelerates the deterioration of the hydraulic oil; The displacement control system can change the displacement of the pump and the speed of the driving motor, so that the output power of the hydraulic power system can match the load as much as possible, which greatly improves the efficiency of the system....

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a valve-controlled adjustment system and its adjustment method based on PWM without throttling loss, which solves the problems of high throttling loss, low system efficiency, volumetric The response speed of the control method is slow, the requirements for the motor and the hydraulic pump are high, the price is expensive, and the control method is complicated.

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