Load-Handling Vehicle Engine-Speed Control to Reduce Tire Wear
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Solution Overview
Problem
Existing load-handling vehicles experience premature wear of tires, excessive fuel consumption, and mechanical stress due to simultaneous wheel advancement and bucket operation, leading to inefficient bucket loading and increased risk of damage.
Innovation Solution
A load-handling vehicle with a control unit that adjusts engine speed based on bucket movement detection, reducing torque to the wheels when bucket movement does not conform to expected operations, optimizing bucket loading times and preserving vehicle mechanics and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operator presses harder on the accelerator pedal to advance the vehicle into the heap and simultaneously perform bucket digging and arm lifting operations, then the productivity and bucket filling speed are improved, but the tire wear increases, fuel consumption increases, and mechanical stress increases with high risk of damage
Solution Approach 1:
The control unit receives feedback from the system for detecting bucket movements to determine whether the bucket is successfully being filled. Based on this feedback, the control unit automatically adjusts the engine rotation speed and torque transmission to the wheels, reducing thrusting force when bucket filling is detected. This closed-loop feedback mechanism resolves the contradiction by automatically coordinating vehicle advancement with bucket operation, eliminating the need for operator intervention while preventing excessive tire wear and mechanical stress.
Solution Approach 2:
The system dynamically changes the parameter of engine rotation speed based on the detected bucket movement state. When bucket filling is detected, the control unit reduces the engine speed to a value lower than the speed control setpoint, thereby reducing torque and thrusting force. This parameter adjustment resolves the contradiction by optimizing the balance between vehicle advancement and bucket operation, maintaining productivity while reducing harmful effects on tires and mechanics.
2Loss of time
If the vehicle advances at full power into the heap to fill the bucket as much as possible in one go, then the bucket loading time is reduced, but the thrusting force causes excessive friction and strain on the bucket against the heap, opposing the digging and tipping-out movements
Solution Approach 1:
The detection system provides real-time feedback on bucket movement and filling status. The control unit uses this feedback to dynamically adjust engine speed and torque, reducing thrusting force when bucket digging or tipping operations are detected. This feedback mechanism resolves the contradiction by automatically reducing the opposing friction force on the bucket while maintaining efficient loading progress.
Solution Approach 2:
The system dynamically adjusts the engine rotation speed and torque transmission based on the real-time state of bucket operations. By making the thrusting force dynamic rather than constant, the system optimizes the balance between advancing into the heap for efficient loading and reducing strain on the bucket during digging and tipping movements.
3Productivity
If the control unit reduces the speed of rotation of the heat engine to a value lower than the speed control setpoint, then the torque to wheels is reduced and bucket loading is optimized, but the vehicle advancement speed decreases
Solution Approach 1:
The control unit periodically adjusts the engine speed based on the detected operational phase. During bucket filling operations, the engine speed is reduced to optimize loading efficiency. During transport phases, the engine speed returns to the control setpoint for efficient advancement. This periodic adjustment resolves the contradiction by optimizing speed for each specific operational phase rather than maintaining a constant speed.
Solution Approach 2:
The system makes the engine rotation speed dynamic, adjusting it based on the real-time detected state of bucket operations. The speed is reduced only when and where needed (during bucket filling) and maintained at full setpoint during transport phases. This dynamic adjustment resolves the contradiction by optimizing the trade-off between loading efficiency and advancement speed at different moments in the operational cycle.
Data Source
AI summary
The invention relates to a load-handling vehicle (1) comprising a wheeled chassis (2) and, supported by said chassis (2),—an internal combustion engine (4),—a mechanism (5) for transmitting power from the internal combustion engine (4) to the wheels (3) of the chassis (2),—a bucket (7),—a system for moving said bucket (7),—a control unit (9),—an accelerator pedal (10),—a control member (11) which can be manually actuated by the driver of the vehicle,—a system (12) for detecting movements of the bucket (7). The power transmission mechanism (5) is configured so that a reduction in the rotational speed of the internal combustion engine (4) results in a reduction in the torque supplied to the wheels (3) of the chassis (2) and the vehicle (1) comprises at least one operating mode in which the control unit (9) is configured, in accordance with the data provided by the system (12) for detecting the movements of the bucket (7) and the control instructions of the system for moving the bucket (7), to reduce the rotational speed of the engine (4) to a value lower than the set value for speed control corresponding to the position of the accelerator pedal (10).