Work Machine Deceleration Control for Smooth Direction Switching

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Solution Overview

Problem

Conventional work machines experience reduced work accuracy and shocks during deceleration, particularly when switching between forward and backward travel, which can affect the operator.

Innovation Solution

An operation control method and system that adjusts acceleration until the work machine reaches a target speed during speed reduction, based on user input, to mitigate shocks and improve efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the work machine decelerates suddenly during travel direction switching, then the response time is reduced, but shocks are transmitted to the operator and work accuracy is reduced

Engineering Contradiction:

Improveresponse timeVSAvoidshocks to operator

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The control device calculates and sets a deceleration period in advance before the actual deceleration occurs. By determining the time from current position to target position and dividing by target speed, the system prepares a cushioning deceleration schedule that prevents sudden shocks while maintaining efficient response time.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The system dynamically adjusts the deceleration profile based on real-time conditions. The control device continuously monitors current position, target position, and machine speed to calculate appropriate deceleration periods, making the deceleration process adaptive rather than fixed, thereby balancing speed and comfort.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the work machine decelerates suddenly, then the operational efficiency is improved, but work accuracy is reduced

Engineering Contradiction:

Improveoperational efficiencyVSAvoidwork accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The control device establishes a cushioning deceleration period before reaching the target position, ensuring that the machine slows down gradually rather than abruptly. This pre-planned deceleration maintains work accuracy by preventing sudden movements that would compromise precision while still achieving timely arrival at the target.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The system performs preliminary calculation of the deceleration profile before execution. By computing the required deceleration period based on current and target positions and speeds, the system prepares the optimal deceleration schedule in advance, ensuring both efficiency and accuracy are maintained throughout the deceleration process.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260014859A1Operation control method, operation control system, and operation control program

Publication Date: 2026.01.15 YANMAR HLDG CO LTD

AI summary

The operation control method includes: executing travel control related to travel of the work machine; and adjusting acceleration until time at which a travel speed of the work machine reaches target speeds V1, V2 during the speed reduction of the work machine in accordance with a user's operation.