Electric Work Vehicle Cruise Control for Fast Speed Response
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Solution Overview
Problem
Existing electric work vehicle control systems with cruise mode functionality require drivers to operate the travel instruction tool beyond its intended range to adjust vehicle speed, leading to potential delays and inefficiencies, especially at high speeds, and lack quick stopping capabilities without pressing the brake pedal.
Innovation Solution
A control system for electric work vehicles that includes a travel instruction tool, a sensor to detect its operation position, and a control device that manages the traveling motor's speed based on the tool's position, allowing for automatic cruise mode execution when the cruise switch is on and predetermined conditions are met, and cancellation when conditions are not satisfied, enabling immediate motor stoppage without brake pedal depression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cruise mode is activated and the travel instruction tool is released, then the vehicle speed is maintained automatically, but the traveling motor cannot be stopped quickly without pressing the brake pedal
Solution Approach 1:
The control device continuously monitors the operation state of the travel instruction tool and provides feedback control. When the tool is detected to be in the neutral position (released state), the control device automatically stops the traveling motor, creating a closed-loop feedback system that eliminates the need for brake pedal operation and enables immediate stopping.
Solution Approach 2:
The system performs self-service by automatically detecting when the travel instruction tool is released and autonomously stopping the traveling motor without requiring additional driver intervention. The cruise control system serves itself by integrating the stopping function directly into the travel instruction mechanism.
2Productivity
If the cruise mode is activated at high speed, then automatic traveling is maintained, but the vehicle cannot quickly adjust to driver's speed adjustment intentions
Solution Approach 1:
The control device implements real-time feedback monitoring of the travel instruction tool position. When any movement from the neutral position is detected, the system immediately responds by adjusting the traveling motor speed accordingly, eliminating the delay that would otherwise require operating the tool beyond its original range.
Solution Approach 2:
The system prepares for immediate response by continuously monitoring the travel instruction tool position even during cruise mode. The control device is pre-positioned to execute speed adjustments as soon as any tool movement is detected, eliminating the need for preliminary tool operations beyond the normal range.
3Adaptability or versatility
If the cruise mode is canceled by operating the travel instruction tool beyond its range, then speed adjustment is possible, but the vehicle speed increases momentarily causing unsafe conditions
Solution Approach 1:
The control device uses feedback control to monitor the exact position of the travel instruction tool. When the tool is detected in the neutral position, the system maintains cruise mode. When any movement is detected, the system cancels cruise mode and adjusts speed smoothly without momentary increases, preventing the harmful effect of instantaneous speed changes.
Solution Approach 2:
Instead of requiring the driver to operate the tool beyond its range to cancel cruise mode (which causes speed increases), the system inverts the logic: any movement from the neutral position cancels cruise mode and initiates smooth speed adjustment, eliminating the need for excessive tool operation and preventing harmful speed spikes.
Data Source
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AI summary
[Problem] In a control system for an electric work vehicle, when a cruise switch is turned on, a vehicle is shifted more quickly to an operation that reflects a driver's intention. [Solution] The control system includes a control device that controls a rotation speed of a traveling motor on the basis of an operation position of a travel instruction tool and a cruise switch that instructs execution of a cruise mode in which a rotation speed of the traveling motor is controlled by an ON operation so that a set vehicle speed is stored and that traveling is maintained without an operation of the travel instruction tool. The control device executes the cruise mode when the cruise switch is turned on and a predetermined condition is satisfied, cancels the cruise mode when the cruise switch is turned on but the predetermined condition is not satisfied, and if it is determined that there is no operation of the travel instruction tool after the cancellation of the cruise mode, the rotation speed of the traveling motor is stopped.