Zero-Turn Mower Lever Control With Real-Time Neutral Calibration
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Solution Overview
Problem
Existing rolling vehicles with zero turn radius, such as mowing vehicles, require a time-consuming calibration procedure by a qualified operator to set the neutral position of the control lever, which is not feasible for real-time adjustments and can be affected by mechanical wear.
Innovation Solution
The vehicle is equipped with a control system that includes a second sensor to detect the angular position of the lever, a memory to store the neutral position, and a control unit that automatically calibrates the neutral position in real time, using data from an existing sensor to determine the neutral position without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration procedure is used to set the neutral position of the control lever, then the neutral position can be determined, but the procedure is time-consuming and requires a qualified operator
Solution Approach 1:
The control system automatically determines the neutral position of the lever using sensors and processing means, eliminating the need for manual calibration by a qualified operator. The system performs self-calibration by detecting the lever position through sensors and storing the neutral position data in memory, thereby resolving the contradiction between accurate measurement and time consumption.
Solution Approach 2:
The patent replaces the manual mechanical calibration procedure with an automated electronic system comprising sensors, processing means, and memory. The processing means automatically processes sensor signals to determine the neutral position, substituting the mechanical manual adjustment process with an electronic automation system that reduces both time and skill requirements.
2Reliability
If manual calibration is performed in the factory, then the neutral position is set, but the calibration cannot be adjusted in real-time and is affected by mechanical wear
Solution Approach 1:
The calibration system is designed to be dynamic rather than static. The processing means can continuously or periodically recalibrate the neutral position during vehicle operation, allowing the system to adapt to mechanical wear and operational changes. This dynamic recalibration capability ensures long-term reliability while providing real-time adjustment flexibility.
Solution Approach 2:
The system incorporates feedback through sensors that continuously monitor the lever position. The processing means uses this feedback to detect deviations from the calibrated neutral position and can trigger recalibration procedures. This closed-loop feedback mechanism maintains accuracy over time and enables real-time adaptation to wear and operational variations.
3Ease of manufacture
If individual programming of each vehicle is carried out in the factory, then the neutral position is stored, but the procedure must be repeated upon component change or failure
Solution Approach 1:
The system performs preliminary calibration automatically during vehicle assembly or initial startup, storing the neutral position in memory. This preliminary action establishes the baseline calibration that persists through component changes, eliminating the need for repeated manual calibration procedures and improving both manufacturing ease and productivity.
4Ease of operation
If mechanical transmission is used to transmit lever movements to motors, then the vehicle can be controlled, but the construction becomes complex
Solution Approach 1:
The patent replaces complex mechanical transmission systems with electronic control. Sensors detect lever position and convert mechanical movement into electrical signals, which are then processed and used to control the motors electronically. This substitution eliminates the need for complex mechanical linkages while maintaining full vehicle control capability, thereby reducing device complexity.
Data Source
AI summary
A rolling vehicle (1) has a chassis (2) equipped with a pair of drive wheels (3) and a system (4) for controlling the rotational driving of the drive wheels having two motors (5) and a control device (6) for each motor (5).Each control device (6) has a second sensor (9) for detecting the angular position of said associated lever (7) about the first pivot axis (XX′), a memory (10) for storing the neutral position (PN) of said the lever (7) and a control unit (11) configured to, in the active state of the lever (7), control the speed and the direction of rotation of the associated motor (5) as a function of the data from the second sensor (9) and of the stored neutral position (PN). The control unit (11) is, in calibration operating mode, configured to order a storage of the neutral position (PN) corresponding to a datum supplied by the second sensor (9) at least as a function of the data supplied by the first sensor (8).