Interlocked Engine and Vehicle Speed Control for Work Vehicles
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Solution Overview
Problem
Existing mowing machines require operators to carefully adjust vehicle speed and engine revolutions independently, leading to potential engine overload and inefficient operation.
Innovation Solution
A traveling work vehicle with a single rotary power source, interlocked engine revolution and vehicle speed control system, utilizing a PID control mechanism to adjust engine revolutions and vehicle speed based on user input, ensuring optimal speed for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of revolutions of the engine is increased to improve mowing performance, then the mowing performance is improved, but the vehicle speed control becomes more difficult and engine overload may occur
Solution Approach 1:
The patent combines the engine revolution adjustment and vehicle speed adjustment into a single integrated control system. When the operator operates the accelerator lever to adjust engine revolutions, the system automatically and interlockedly adjusts the vehicle speed through the traveling transmission mechanism, merging two previously independent control functions into one coordinated operation.
Solution Approach 2:
The system incorporates feedback mechanisms where the actual number of engine revolutions is detected and used to automatically adjust the vehicle speed. The control unit continuously monitors engine revolution changes and相应地 adjusts the vehicle speed to maintain optimal operating conditions, creating a closed-loop control system that prevents engine overload while maintaining mowing performance.
2Adaptability or versatility
If independent adjustment of engine revolutions and vehicle speed is maintained, then operational flexibility is preserved, but the risk of engine overload increases and operation complexity increases
Solution Approach 1:
The patent merges the control functions of engine revolutions and vehicle speed into an interlocked system where a single input (accelerator lever operation) simultaneously controls both parameters. This reduces the effective control complexity for the operator while maintaining the adaptability needed for different working conditions through the system's automatic adjustment capabilities.
Data Source
AI summary
A traveling work vehicle includes: a vehicle speed control portion configured to control the vehicle speed; a number-of-revolutions calculation portion configured to calculate, as an actual number of revolutions, a number of revolutions of a single rotary power source per unit time; a number-of-revolutions command generation portion configured to generate a number-of-revolutions command using a requested number of revolutions; a requested vehicle speed input portion configured to input a requested vehicle speed that is based on a user operation; a requested vehicle speed calculation portion configured to calculate a computed requested vehicle speed using a deviation between the requested number of revolutions and the actual number of revolutions, and the requested vehicle speed; and a vehicle speed command generation portion configured to give the vehicle speed control portion a vehicle speed command that is generated using the computed requested vehicle speed.