Mathematical‐based control method and performance analysis of a novel hydromechatronics driving system micro‐independent metering

Abstract

This paper aims to investigate the performance of a hydraulic actuator controlled by the novel system micro-independent metering (MIM). This analysis has been performed by comparing the models of two systems which are the traditional independent metering, that depends on poppet valve, and the new hydro-mechatronics system micro-independent metering, that relies on a stepped rotary flow control valve. In general, independent metering is a hydraulic control system which guarantees a separation between the meter-in and the meter-out of the hydraulic actuator.A Valvistor valve, a special type of Poppet valves, was developed to be embedded into the independent metering (IM) system. This valve has controllability and stability shortcomings which prevent the system from spreading in the industrial applications. The Valvistor valve performance is highly affected by the fluid disturbances because the fluid is considered as a part of its control elements. A stepped rotary flow control valve has been developed to control hydraulic flow rate. The valve composed of a rotary orifice attached to a stepper motor. Using this valve instead of the traditional poppet type has led to a new configuration, that is termed by micro-independent metering. This form improves the hydraulic cylinder velocity performance by rejecting the fluid disturbances effect on the control circuit.

High Tracking Control for a New Independent Metering Valve System Using Velocity-Load Feedforward and Position Feedback Methods

“…In addition to the high tracking precision, energy consumption is also one of the criteria to evaluate the effectiveness of the proposed control method. The energy consumption of the system can be calculated based on the energy consumption of the electric motor, which drives the main pump of the NIMV system, and is provided by Equation (24). =  E T dt (24) where E is the energy consumption of the electric motor, T is the torque and is the angular velocity which converts from the speed of the motor.…”

“…The energy consumption of the system can be calculated based on the energy consumption of the electric motor, which drives the main pump of the NIMV system, and is provided by Equation (24). =  E T dt (24) where E is the energy consumption of the electric motor, T is the torque and is the angular velocity which converts from the speed of the motor. Based on Equation ( 24), the comparison of the energy consumption of both control methods is provided in Figure 14.…”

“…The result shows the energy consumption in the PE mode is the same, but the motor speed after 4.5 s of the VF + PID method fluctuates In addition to the high tracking precision, energy consumption is also one of the criteria to evaluate the effectiveness of the proposed control method. The energy consumption of the system can be calculated based on the energy consumption of the electric motor, which drives the main pump of the NIMV system, and is provided by Equation (24).…”

“…Firstly, the cost of the proportional valve causes a high cost for the system [23]. Secondly, controlling four valves is particularly challenging because of various types of nonlinearities in hydraulic systems [24]. Therefore, reducing the number of proportional valves and developing control methods are current research trends [25,26].…”

A Study on a New Independent Metering Valve for Hydraulic Boom Excavator

“…In addition, a regeneration mode in the CIMV system operates without a flow from the pump. Thus, the energy consumption of the CIMV system is lower than that of the conventional excavator, which has been proven by numerous research projects and patents [21][22][23][24][25][26]. However, controlling four proportional valves is not simple when they depend on a pressure difference between the inlet and outlet of the valves, which leads to poor performance in valve control.…”