Differential Hydraulic Drive Control for Variable Wheel Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing agricultural implements with differential hydraulic drive systems face challenges in responding to varying steering and speed commands, as they control wheel speed uniformly regardless of the speed at which the commands are applied, making operation challenging for operators.
Innovation Solution
A differential drive system with variable acceleration rates for left and right drive systems based on the acceleration rate of the steering or propulsion input, controlled by a drive controller that adjusts wheel speed according to the input's acceleration, allowing user-defined preferences for responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the differential drive system controls wheel speed uniformly regardless of command application speed, then the system structure remains simple, but the ease of operation deteriorates due to challenging vehicle response
Solution Approach 1:
The patent applies dynamics by making the acceleration rate of the drive system variable rather than fixed. The controller dynamically adjusts the acceleration rate based on the acceleration rate of the steering or propulsion input, allowing the system to adapt its response characteristics in real-time. This resolves the contradiction by improving ease of operation through adaptive response while maintaining reasonable system complexity through algorithmic control rather than mechanical complexity.
Solution Approach 2:
The patent changes the parameter of acceleration rate from a constant value to a variable value that depends on the input acceleration rate. By implementing this parameter change, the system can provide tailored responses to different operating conditions, improving ease of operation without requiring complex mechanical modifications, thus resolving the technical contradiction.
2Ease of operation
If the system provides variable acceleration rates based on input acceleration rate, then the ease of operation improves, but the device complexity increases due to additional control algorithms and sensors
Solution Approach 1:
The patent implements feedback by using the acceleration rate sensor to detect the actual acceleration rate of the steering or propulsion input and feeding this information back to the controller. The controller then uses this feedback to adjust the drive system's acceleration rate accordingly. This feedback mechanism improves ease of operation by creating a responsive, adaptive system while managing complexity through intelligent control algorithms that process sensor data efficiently.
3Speed
If the drive controller adjusts wheel speed based on input acceleration rate, then the responsiveness improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent replaces mechanical precision requirements with electronic control precision. Instead of requiring mechanically precise components to achieve responsive wheel speed adjustment, the system uses a controller with an acceleration rate sensor and algorithm to dynamically adjust wheel speed. This substitution of mechanical systems with electronic control systems improves responsiveness while reducing the stringency of manufacturing precision requirements for mechanical components.
Data Source
AI summary
An implement includes a steering input operable to receive a desired vehicle steering command and a differential hydraulic drive system. A drive controller determines an acceleration rate of the steering input while receiving the desired vehicle steering command and defines a left acceleration rate and a right acceleration for a left hydraulic drive system and a right hydraulic drive system respectively based on the acceleration rate of the steering input while receiving the desired vehicle steering command. The drive controller communicates the left acceleration rate and the right acceleration rate to the differential hydraulic drive system to achieve the desired vehicle steering command.