Traveling Motor Speed Control for Straight-Travel Auto-Deceleration
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Solution Overview
Problem
Existing working machines lack an efficient method for automatic deceleration during straight traveling, which can lead to unintended speed changes and reduced operational efficiency.
Innovation Solution
A working machine equipped with a controller that automatically reduces the rotation speed of traveling motors from a second speed stage to a first speed stage during straight traveling, using detected rotation speeds and pressures in the hydraulic system to determine the appropriate deceleration thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic deceleration control is implemented during straight traveling, then speed control precision is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The hydraulic pump system serves multiple functions: it provides both propulsion power and speed sensing capability through its inherent pressure characteristics. The existing hydraulic circuit is utilized for dual purposes, eliminating the need for separate speed sensors and reducing overall system complexity while achieving precise speed control.
Solution Approach 2:
The system uses its own hydraulic pressure signals to detect traveling state and trigger deceleration control. The hydraulic circuit self-monitors its operating conditions and automatically initiates speed reduction when threshold pressures are detected, enabling the system to serve its own control needs without external sensing equipment.
2Reliability
If deceleration threshold is set low for sensitive detection, then deceleration timing is improved, but false triggering increases during normal operation
Solution Approach 1:
The system pre-establishes a threshold pressure value that anticipates the conditions leading to unintended speed changes. By setting this threshold in advance based on expected hydraulic pressure characteristics during normal operation versus deceleration conditions, the system proactively prevents false triggering while maintaining sensitive detection capability.
Solution Approach 2:
The deceleration threshold is not fixed but dynamically adjusted based on current traveling conditions. The control system monitors real-time hydraulic pressure and rotation speed to adaptively determine the appropriate threshold, allowing the system to maintain high sensitivity when deceleration is needed while preventing false activation during normal high-speed operation.
3Stability of the object's composition
If deceleration threshold is set high to prevent false triggering, then operational stability is improved, but deceleration response time increases
Solution Approach 1:
The control system prepares for deceleration by continuously monitoring hydraulic pressure and identifying trends that precede the need for speed reduction. When pressure approaches the threshold range, the system pre-adjusts control parameters and readies the deceleration sequence, ensuring rapid response when the actual deceleration condition is met without sacrificing stability during normal operation.
Data Source
AI summary
A working machine includes a first rotation detector to detect a first rotation speed of the left traveling motor, a second rotation detector to detect a second rotation speed of the right traveling motor, and a controller to perform automatic deceleration to automatically reduce the first rotation speed and the second rotation speed both set at respective second speed stages by shifting a speed stage of each of the first rotation speed and the second rotation speed to a first speed stage that is lower than the second speed stage. During straight traveling of a machine body of the working machine, the controller determines a straight-traveling threshold serving as a deceleration threshold for judging whether to perform the automatic deceleration based on the first rotation speed or the second rotation speed.