Control Lever Signal Calibration for Neutral Drift Compensation
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Solution Overview
Problem
Existing control lever systems in work vehicles, such as ZTR mowers and lawn tractors, face issues with neutral position drift and range variation over time, leading to inaccurate translation of sensor signals to traction drive motors.
Innovation Solution
A control lever calibration system that uses an electronic sensor to map position signals to traction drive motor commands, automatically updating the neutral position and range limits, and accommodating sensor drift by capturing and adjusting these values during vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If physical methods such as mechanical stops are used to place control levers in neutral position and prevent drift, then neutral position stability is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent replaces mechanical stops and physical calibration methods with an electronic sensor system that uses software-based calibration to detect and correct control lever positions. The electronic sensor continuously monitors lever position and the controller dynamically adjusts the mapping between sensor signals and motor commands, eliminating the need for mechanical calibration components while maintaining position accuracy over time.
2Ease of operation
If electronic sensors are used to detect control lever position, then ease of operation is improved, but measurement precision deteriorates due to sensor drift over time
Solution Approach 1:
The patent implements a feedback mechanism where the electronic sensor continuously provides position signals to the controller, which compares these signals against calibrated reference values stored in memory. When drift is detected, the controller dynamically remaps the sensor signal range to maintain accurate correspondence between control lever position and motor commands, ensuring long-term measurement precision without requiring manual recalibration.
Solution Approach 2:
The system dynamically changes the mapping parameters between sensor signals and motor commands based on detected drift. The controller adjusts the calibration parameters stored in memory to compensate for sensor drift, allowing the electronic sensor to maintain measurement precision over time while continuing to provide ease of operation.
3Manufacturing precision
If manual calibration methods are used to update neutral position and range limits, then manufacturing precision is improved, but productivity deteriorates due to time-consuming calibration processes
Solution Approach 1:
The patent enables the control system to perform self-calibration automatically during vehicle operation. The controller monitors sensor signals, detects when control levers reach their mechanical stops or neutral positions, and automatically updates the calibration parameters stored in memory without requiring manual intervention. This self-service calibration maintains manufacturing precision while eliminating time-consuming manual calibration processes.
Solution Approach 2:
The system performs preliminary calibration actions automatically during vehicle startup or operation by detecting when control levers are in known positions (such as when neutral switches are activated or when levers contact mechanical stops). This preliminary automatic calibration ensures manufacturing precision is maintained without requiring separate manual calibration steps, thereby improving productivity.
Data Source
AI summary
A control lever calibration system includes translating position signals of a control lever to traction drive motor commands for a work vehicle, determining if the position signals are within a stored range of control lever position signals, and expanding the stored range if position signals are outside the stored range.