Hydraulic Working Vehicle Control for Fast Oil Flow Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional operation control devices for hydraulic shovels experience control delays and poor responsivity during rapid changes in differential pressure, leading to hunting issues and inefficient energy consumption due to the need for a single electric motor to drive multiple hydraulic pumps.
Innovation Solution
An operation control device that includes a hydraulic actuator, an operating oil supply source, a sent-out oil amount control device, and operating oil supply control devices, which control the oil flow based on the sum of operation signals and weighted operation signals to precisely supply necessary oil amounts, reducing hunting and improving responsivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control is used to determine discharge flow rate based on pressure difference, then the system can maintain stable operation, but control responsivity becomes slow and hunting occurs during rapid pressure changes
Solution Approach 1:
The controller determines the target discharge flow rate in advance based on the operation signal from the operating device, before actual pressure changes occur. This preliminary determination of flow rate based on operator input eliminates the delay inherent in feedback control, as the system prepares the appropriate flow rate proactively rather than reactively responding to pressure differences.
Solution Approach 2:
The system incorporates feedback by the controller monitoring actual discharge flow rate and comparing it with the target discharge flow rate, then adjusting the hydraulic pump's discharge flow rate accordingly. This closed-loop feedback ensures stable operation while maintaining fast responsivity, as the controller continuously corrects any deviations from the target flow rate determined from operation signals.
2Device complexity
If one electric motor drives all hydraulic pumps, then the system structure is simplified, but energy consumption increases due to the motor needing to operate at highest pressure levels continuously
Solution Approach 1:
The hydraulic pump system is segmented into multiple independent hydraulic pumps, each capable of being driven by separate electric motors. This segmentation allows each pump to operate independently at optimal pressure levels based on actual workload requirements, rather than one motor continuously operating at maximum capacity to handle peak demands across all actuators.
Solution Approach 2:
The system dynamically assigns electric motors to drive hydraulic pumps based on real-time operational needs. When certain hydraulic actuators require high pressure, only the corresponding hydraulic pump is driven at high power, while other pumps operate at lower power or remain idle. This dynamic adaptation optimizes energy consumption by matching motor output to actual demand rather than maintaining constant high-power operation.
Data Source
AI summary
An operation control device for a working vehicle which includes a hydraulic working device, comprises a hydraulic actuator to drive the hydraulic working device, an operating oil supply source for driving the hydraulic actuator, a sent-out oil amount control device that controls the amount of oil sent out from the operating oil supply source, an operating device to be operated to make the hydraulic actuator work, and an operating oil supply control device that performs control to supply operating oil to the hydraulic actuator according to operation of the operating device. The sent-out oil amount control device controls the amount of oil sent out from the operating oil supply source according to the operation amount of the operating device.