Electric Lift Arm Control With Resolver Homing and Float Mode
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Solution Overview
Problem
Conventional power machines rely on hydraulic systems, which can be complex and costly, and often require precise position tracking of electronically controlled work elements, posing challenges in calibration and ride control.
Innovation Solution
The implementation of an electrically powered power machine with a control system that includes electrical actuators and a resolver for precise position tracking, allowing for homing operations during startup and float mode operations to improve ride control and reduce power surges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hydraulic systems are used to power work elements, then complex and costly systems are required, but position tracking precision is achieved
Solution Approach 1:
The patent replaces hydraulic systems with electric motors and electronic control systems. Specifically, electric motors are used to power work elements (lift arm, implement carrier) instead of hydraulic motors, and electronic sensors/resolvers are used for position feedback instead of hydraulic position tracking mechanisms. This substitution reduces system complexity while maintaining or improving measurement precision through electronic sensing and digital control.
Solution Approach 2:
The patent introduces electronic intermediaries (sensors, resolvers, microprocessors) between the power source and work elements to achieve precise position tracking. These electronic intermediaries provide digital feedback signals that enable accurate position measurement and control without requiring complex hydraulic sensing systems.
2Speed
If electrical actuators are used without homing operations, then startup position uncertainty occurs, but operational speed is maintained
Solution Approach 1:
The patent implements homing operations as a preliminary action during startup. Before normal operations begin, the system automatically moves electrical actuators to predetermined reference positions (home positions) and stores these position values in memory. This preliminary calibration ensures that subsequent operations start from known, accurate position references, eliminating position uncertainty while allowing full operational speed to be maintained afterward.
3Productivity
If rapid actuator movement is commanded during startup, then operational efficiency is improved, but position accuracy deteriorates
Solution Approach 1:
The patent implements dynamic speed adjustment based on operational phase. During homing operations, actuators move at reduced speeds to ensure accurate position detection and calibration. Once homing is complete and reference positions are established, the system transitions to normal operational mode where higher speeds are permitted. This dynamic adaptation of movement speed optimizes both position accuracy during calibration and operational efficiency during work operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient and precise control of lift arms and other work elements, improves operator comfort, and reduces wear on power system components by minimizing power fluctuations and enhancing calibration accuracy.
Implementation Method 1
The power machine can include a resolver in communication with the at least one electrical actuator to track relative movement of the at least one electrical actuator
Data Source
AI summary
A power machine can include a frame, a lift arm, and one or more electrical devices for control of one or more work elements. The electrical devices can be controlled to improve positional accuracy for work elements during work operations, to improve power management and customer experience (e.g., to provide smoother ride during drive operations), and to provide float functionality for work elements.