Work Vehicle Speed Change Controller for Motor Stability
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Solution Overview
Problem
Existing work vehicles face challenges in controlling motor speed changes, particularly when numerous speed stages are involved, leading to potential motor stalling or over-rotation due to inadequate shock absorption during speed changes.
Innovation Solution
A speed change controller that breaks down speed change commands into multiple stages and incorporates a defined interval, either time or distance, to manage the load and prevent motor stalling or over-rotation, allowing for adjustable speed change intervals based on operator preference or load detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the speed change controller outputs speed change commands for all stages at once, then the productivity is improved, but the motor may stall or over-rotate due to excessive load
Solution Approach 1:
The speed change controller divides a multi-stage speed change command into smaller sub-commands that are executed sequentially. When a speed change request is received, the controller breaks it down into multiple intermediate speed change steps, executing them one after another with appropriate timing intervals, rather than attempting to execute all stages simultaneously. This segmentation prevents excessive load on the motor while still achieving the desired speed change.
Solution Approach 2:
The controller implements periodic speed change commands with defined intervals between successive speed change stages. Instead of continuous or simultaneous speed changes, the system applies speed change commands at periodic intervals, allowing the motor to adapt to each change before the next one occurs. This periodic approach maintains motor stability while progressing through multiple speed stages.
2Adaptability or versatility
If the number of speed change stages is increased to accommodate human operation requirements, then the adaptability is improved, but the shock during speed change increases and motor control becomes difficult
Solution Approach 1:
The controller segments large speed change ranges into multiple smaller incremental steps. Instead of executing a single large speed change command that causes shock, the system divides it into multiple smaller adjustments distributed over time. Each incremental change produces minimal shock, while the cumulative effect achieves the desired overall speed change across multiple stages.
Solution Approach 2:
The controller预先 applies cushioning measures by implementing gradual speed transitions before reaching extreme speed changes. The system prepares for upcoming speed changes by progressively adjusting motor parameters and applies damping control strategies in advance, reducing the impact shock that would otherwise occur during abrupt multi-stage speed transitions.
3Productivity
If speed change commands are executed without defined intervals, then the productivity is improved, but the motor rotation speed recovery time is insufficient leading to stalling or over-rotation
Solution Approach 1:
The controller enforces periodic timing intervals between successive speed change commands. After each speed change command is issued, the system waits for a predetermined time period that allows the motor rotation speed to stabilize and recover before issuing the next command. This periodic timing ensures motor stability is maintained while still progressing through multiple speed stages efficiently.
Solution Approach 2:
The controller performs preliminary timing calculations and prepares appropriate wait intervals before executing each speed change command. By anticipating the motor's response time requirements, the system pre-calculates and implements sufficient delays between commands, ensuring the motor has adequate time to adjust its rotation speed without compromising overall productivity.
Data Source
AI summary
A vehicle includes; a vehicle body on which the motor is mounted; an apparatus provided to the traveling vehicle body and also driven by drive power from the motor; an apparatus that performs work on a field; an apparatus that changes the speed of drive power input from the motor and transmits the drive power; a tool that includes speed change stages and is also capable of speed change operation of the speed change apparatus by human operation; a controller that, when the number of speed change stages is changed based on human operation of the speed change operation tool, outputs to the speed change apparatus a speed change command for each predefined number of stages and is also capable of outputting the speed change command for each defined speed change interval; and an operation mechanism that enables adjustment of the speed change interval.