Windrower Propulsion Control for Traction-Adaptive Steering
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Solution Overview
Problem
Dual-path agricultural machines face inefficiencies in propulsion and steering due to traction loss on uneven surfaces, manual engagement of steering systems, and excessive fuel use at low speeds, leading to reduced maneuverability and fuel inefficiency.
Innovation Solution
A control system that automates propulsion, steering, and engine speed adjustments using semi-closed or closed-loop control, incorporating sensors to optimize engine speed, hydraulic pressure, and flow, with setpoint adjustments limited by thresholds to prevent immobilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual engagement of steering systems is used, then device complexity is reduced, but ease of operation deteriorates due to hindered maneuverability in field conditions
Solution Approach 1:
The steering system automatically engages and disengages based on detected ground conditions without requiring manual operator intervention. The system monitors traction conditions and autonomously activates the positively-controlled steered caster when slippage or sticking is detected, then automatically disengages when conditions improve, making the system self-regulating and eliminating manual engagement requirements
Solution Approach 2:
The system incorporates sensors that continuously monitor ground conditions, traction status, and machine movement. This feedback is processed by a controller that determines when to engage or disengage the positively-controlled steered caster, creating a closed-loop control system that adapts to changing field conditions in real-time
2Power
If throttle is set to full engine speed to ensure full range of propulsion system, then power availability is improved, but use of energy deteriorates through unnecessary fuel consumption at low speeds
Solution Approach 1:
The system dynamically adjusts engine speed and hydraulic system pressure/flow based on actual propulsion needs and ground conditions. The controller modulates engine RPM and hydraulic parameters in real-time, allowing the propulsion system to operate at optimal power levels rather than maintaining constant full-throttle operation, thereby reducing fuel consumption while preserving available power when needed
Solution Approach 2:
The system changes operating parameters (engine speed, hydraulic pressure, hydraulic flow) based on detected conditions. When traction is adequate, parameters are reduced to conserve fuel; when slippage or sticking is detected, parameters are increased to maintain propulsion effectiveness, creating an adaptive power management system
3Use of energy by moving object
If propulsion system operates at lower loads, then fuel efficiency is improved, but power availability deteriorates reducing ability to overcome stuck tires
Solution Approach 1:
The system proactively detects early signs of ground condition deterioration (increased slippage, resistance changes) and preemptively increases propulsion power and activates the positively-controlled steered caster before the machine becomes completely stuck. This preliminary action prevents the need for high-power recovery maneuvers later, maintaining fuel efficiency while ensuring power availability when truly needed
Solution Approach 2:
The system performs preliminary engagement of the positively-controlled steered caster and adjustment of propulsion parameters before complete loss of traction occurs. By detecting early warning signs and acting in advance, the system maintains continuous adequate power delivery without requiring excessive fuel consumption, as the corrective action is taken before the situation escalates
4Ease of operation
If hydraulic damping steer-assist systems are used, then ease of operation is improved for smooth motion, but reliability deteriorates when loss of traction causes machine motion to not match steering input
Solution Approach 1:
The system dynamically switches between hydraulic damping steer-assist mode and positively-controlled steered caster mode based on ground conditions. During normal operation, the hydraulic damping provides smooth motion; when slippage or sticking is detected, the system transitions to the positively-controlled mode which maintains reliable steering control by mechanically coupling the caster to the frame through a controlled articulation point
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
Improves drive efficiency by optimizing propulsion and steering, reduces fuel consumption at low speeds, and enhances maneuverability by automatically adapting to changing conditions.
Implementation Method 1
pressure and flow of a hydraulic propulsion system
Implementation Method 2
engine speed and pressure and flow of the hydraulic propulsion system
Data Source
AI summary
Described herein are control systems and methods for self-propelled windrowers and other types of agricultural dual-path machines that improve drive efficiency of the machines through automated control of propulsion, steering, or engine speed. In some embodiments, a control system improves drive efficiency by adjusting engine speed and pressure and flow of a hydraulic propulsion system. In such embodiments and others, a controller controls the engine speed and pressure and flow of the hydraulic propulsion system in left and right drive pumps and motors of the dual-path machine according to setpoints and adjustment factors. The adjustment factors in such examples and others are not allowed to exceed respective thresholds, such as a fixed percentage of a raw command, to prohibit immobilizing the machine while disabling or limiting the controller. The adjustment factors are based on feedback signals from various sensors of the machine.