Construction Machine Brake Control for Slope Rollback Prevention
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Solution Overview
Problem
Construction machines face challenges in preventing rolling backward on slopes due to their self-weight, which can lead to safety accidents, and existing solutions like gyro sensors are not suitable for these machines as they require continuous braking, disrupting operations.
Innovation Solution
An apparatus and method that automatically operate the brake of a construction machine only when the traveling signal and rotation signal mismatch, using a control unit to manage the brake operation based on traveling and rotation signals, and release braking when sufficient tractive force is secured, without the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gyro sensor is used to detect slope and operate the brake for two seconds when the vehicle starts, then the vehicle can be prevented from rolling backward, but the construction machine cannot perform operations while moving and the brake operation disturbs the workflow
Solution Approach 1:
The brake control system dynamically adjusts brake operation based on real-time comparison between travel lever position and actual movement direction. The system activates brake control only when mismatch is detected, making the brake operation dynamic rather than fixed, thereby preventing rolling backward only when necessary and avoiding disruption to normal operations.
Solution Approach 2:
The patent replaces the gyro sensor-based mechanical detection system with an electronic control system that uses sensors to detect travel lever position and actual movement direction, then uses a control unit to compare these signals and determine when brake operation is necessary. This substitution enables more precise and adaptive brake control.
2Reliability
If the brake is operated unconditionally for two seconds when the vehicle starts after stop, then rolling backward is prevented, but the construction machine operation is disturbed and convenience is reduced
Solution Approach 1:
The system implements feedback control by continuously monitoring both the travel lever position (driver's intended direction) and the actual movement direction, then comparing these feedback signals to determine whether brake operation is necessary. This feedback mechanism ensures the brake is operated only when there is a mismatch, preventing rolling backward while avoiding unnecessary disruption to driver convenience.
Solution Approach 2:
The brake control system transitions from static unconditional brake operation to dynamic conditional brake operation. The system dynamically evaluates the need for brake operation based on real-time comparison of travel lever position and actual movement direction, activating brake control only when mismatch is detected, thereby maintaining safety while improving ease of operation.
3Adaptability or versatility
If the upper body is turned to take a pose for turning, then the direction of the upper body does not match the direction of the lower body, but the gyro sensor-based brake operation cannot distinguish this from rolling backward
Solution Approach 1:
The patent segments the detection function into two independent parts: detecting the travel lever position (intended direction) and detecting the actual movement direction. By comparing these two separate detection results, the system can distinguish between intentional upper body turning (where travel lever and actual direction both indicate the same turn) and unintended rolling backward (where they mismatch), thereby maintaining both adaptability and reliability.
Solution Approach 2:
The system uses feedback from two independent sources: the travel lever position sensor and the actual movement direction sensor. By comparing these feedback signals, the system can accurately determine whether a direction mismatch represents intentional maneuvering or unintended rolling backward, resolving the reliability issue while preserving upper body turning capability.
Data Source
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AI summary
According to a method of preventing a construction machine from rolling backward, it is possible to detect a travelling direction of the construction machine on a slope. Whether the detected travelling direction is an intended travelling direction of a driver of the construction machine may be confirmed. The brake of the construction machine may be controlled to be operated according to whether the detected travelling direction is the same as the intended travelling direction of the driver. Accordingly, when the intended travelling direction of the driver on the slope is not matched with an actual travelling direction of the construction machine, a brake is automatically operated, thereby suppressing the construction machine from rolling backward downhill on the slope.