Construction Vehicle Bucket Control for Hydraulic Impact Reduction
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Solution Overview
Problem
The existing control methods for work vehicles fail to effectively moderate the impacts and vibrations caused when the bucket is operated in the tilt direction from a state where it is forcibly actuated in the tilt direction and the bucket hydraulic cylinder is pressurized by the lifting operation of the boom, leading to degraded operability and workability.
Innovation Solution
A control method that includes a bucket control valve to manage the direction and flow rate of pressure oil to the bucket hydraulic cylinder, combined with boom and bucket operation direction detection, and storage of actuation regions to control the bucket hydraulic cylinder's tilt direction, while restricting the lifting speed of the boom to reduce pressurization and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the boom is lifted while the bucket is in the dump position, then the boom lifting operation is performed, but the bucket is forcibly actuated in the tilt direction and the bucket hydraulic cylinder is pressurized causing impacts and vibrations
Solution Approach 1:
The control device detects the work equipment posture before the boom lifting operation and determines in advance whether the bucket is in a state where it would be forcibly actuated. By predicting the harmful condition before it occurs, the system can prepare the appropriate control response (restricting bucket actuation or controlling hydraulic flow) to prevent the impacts and vibrations from happening in the first place
Solution Approach 2:
The control device continuously monitors the work equipment posture (boom angle, bucket position) and uses this feedback information to dynamically control the bucket control valve. When the feedback indicates that the boom lifting would cause harmful pressurization of the bucket hydraulic cylinder, the system automatically adjusts the hydraulic flow restriction to prevent the harmful effects while allowing normal operation in safe conditions
2Ease of operation
If the bucket operation lever is operated to actuate the bucket in the tilt direction from a pressurized state, then the bucket tilting operation is performed, but abrupt pressure changes occur in the bucket hydraulic cylinder causing vibrations
Solution Approach 1:
The control device uses real-time feedback on the work equipment posture and hydraulic cylinder state to detect when the bucket hydraulic cylinder is in a pressurized condition. When the operator attempts to actuate the bucket from this pressurized state, the feedback mechanism triggers automatic control intervention to manage the pressure transition
Solution Approach 2:
The control device changes the hydraulic flow parameters dynamically by restricting the flow rate of pressure oil to the bucket hydraulic cylinder when harmful pressurization is detected. This parameter change (flow restriction) moderates the pressure buildup and prevents abrupt pressure changes during bucket actuation, thereby eliminating vibrations while still allowing the bucket tilting operation to proceed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution moderates or eliminates the abrupt pressure changes and vibrations, enhancing the operability and workability of the work vehicle by ensuring smooth oil pressure variations and reducing the impact on the vehicle and operator.
Implementation Method 1
the head chamber 6H is pressurized by the force lifting the boom 3, even though pressure oil is not supplied in the direction tilting the bucket 4
Implementation Method 2
controlling the bucket control valve 16 so as to restrict a flow rate of pressure oil supplied to the bucket hydraulic cylinder 6
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
The present invention provides a control method and a control apparatus for a vehicle that make it possible to moderate or completely eliminate the impacts generated when the bucket is operated in a tilt direction, from a state in which the bucket in a dump position is forcibly actuated in the tilt direction and the bucket hydraulic cylinder is pressurized by the lifting operation of the boom and also to perform the boom lifting operation with good operability and workability. Control is performed to supply a pressure oil to the bucket hydraulic cylinder so as to actuate the bucket hydraulic cylinder in the tilt direction when a work equipment is being actuated in an actuation region close to an actuation region in which the bucket is forcibly actuated in the tilt direction by lifting the boom in a state in which the bucket is operated to a neutral position or dump operated, or when the bucket is being actuated in the tilt direction in the actuation region in which the bucket is forcibly actuated in the tilt direction. Further, a pressure oil supplied to the bucket hydraulic cylinder is controlled so as to restrict an actuation speed of the bucket hydraulic cylinder in a dump direction when [the work equipment] being actuated in an actuation region close to an actuation region in which the bucket is forcibly actuated in the tilt direction by operating the boom to a neutral position or lowering the boom in a state in which the bucket is dump operated.