Hydraulic Pump Controller Torque Compensation for Construction Equipment
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Solution Overview
Problem
Construction equipment's engine control unit faces challenges in responding to rapid load variations due to insufficient torque generation and inaccurate torque recognition, leading to unstable compensation control and increased development resources.
Innovation Solution
A hydraulic pump control device that calculates engine speed errors and compensation torques using various pressure sensors and PID controllers, transmitting target engine torque to the engine control unit for stable engine control, especially under rapid load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the engine control unit uses only actual RPM as control information, then the control logic remains simpler, but the response to rapid load variations becomes insufficient and compensation control becomes unstable
Solution Approach 1:
The pump controller calculates torque information in advance and transmits it to the engine control unit before the engine needs to respond to load variations. This preliminary calculation of torque based on pump operating conditions enables the engine control unit to perform more stable compensation control without increasing the overall system complexity
Solution Approach 2:
The pump controller acts as an intermediary that calculates torque information and transmits it to the engine control unit. This intermediary provides the engine control unit with additional torque information without requiring the engine control unit to perform complex torque calculations itself, thus maintaining relative simplicity while improving compensation stability
2Reliability
If the pump controller calculates torque information and transmits it to the engine control unit, then compensation control stability improves, but the pump controller cannot accurately recognize the calculated torque value
Solution Approach 1:
The torque control function is segmented between two controllers: the pump controller calculates and transmits torque information to the engine control unit, while the engine control unit performs the actual compensation control. This segmentation allows each controller to perform its specialized function accurately, with the engine control unit having final authority over torque adjustment
Solution Approach 2:
The engine control unit receives torque information from the pump controller and uses this feedback to perform compensation control. The engine control unit adjusts the engine output based on the transmitted torque information and actual engine conditions, ensuring accurate torque recognition and control
3Speed
If the engine control unit performs compensation control with increased compensation torque value, then the response to rapid load improves, but the pump controller cannot accurately recognize the torque value
Solution Approach 1:
The pump controller performs preliminary calculation of torque information and transmits it to the engine control unit before rapid load changes occur. This allows the engine control unit to have advance knowledge of the required torque adjustments, enabling faster response to rapid load variations
Solution Approach 2:
The communication interface between the pump controller and engine control unit serves as an intermediary that efficiently transmits torque information. This allows the engine control unit to receive and process torque data quickly, improving response speed while maintaining accurate torque value recognition through the structured data exchange protocol
Data Source
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AI summary
The present disclosure relates to a system and method of controlling a vehicle of construction equipment, which calculate a target engine torque from compensation torque information using torque information generated in a hydraulic pump and an engine speed error and transmit the calculated target engine torque, thereby more stably performing engine control while responding to a rapid load variation of the hydraulic pump.