Variable Tipping Pressure Control for Load Carriers
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Solution Overview
Problem
Heavy vehicles, such as trucks and construction equipment, face excessive wear and potential warranty issues due to operators consistently using additional hydraulic pressure margins for tipping loads, leading to overloading and unnecessary maintenance.
Innovation Solution
A method and device that adjust the tipping pressure based on the inclination angle of the vehicle, allowing a first maximal pressure when the angle is less than a predefined value and a second, higher pressure when the angle exceeds this, ensuring the pressure is adapted to the actual conditions while not exceeding the hydraulic system's limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional positive pressure margin is allowed in the hydraulic system, then the nominal load can always be unloaded regardless of external conditions, but the operator may constantly overload the vehicle causing excessive wear and unnecessary repairs
Solution Approach 1:
The patent applies dynamics by making the maximal tipping pressure variable rather than fixed. The control unit dynamically adjusts the maximal tipping pressure based on the measured inclination angle of the working machine. When the inclination angle exceeds a predefined threshold, the system automatically increases the allowed pressure margin, and when the inclination is within normal range, it restricts the pressure to nominal levels. This dynamic adjustment ensures reliable unloading when needed while preventing constant overload and excessive wear during normal operation.
2Object-generated harmful factors
If the additional pressure margin is minimized to prevent overload, then vehicle wear is reduced, but the nominal load may not always be unloaded under varying external conditions
Solution Approach 1:
The system dynamically adjusts the pressure margin based on real-time inclination measurements. When the working machine operates on inclined terrain exceeding the predefined angle, the control unit automatically increases the maximal tipping pressure to ensure the nominal load can be unloaded. When operating on level or gently sloping ground, the system maintains only the nominal pressure, preventing unnecessary wear. This dynamic approach ensures both reliability and wear prevention are achieved at different operating conditions.
3Device complexity
If a fixed maximal tipping pressure is predefined in the hydraulic system, then the system is simple to control, but it cannot adapt to varying inclination angles and load conditions
Solution Approach 1:
The patent implements feedback control by using an inclination sensor to continuously measure the working machine's angle relative to the horizon and feeding this information back to the control unit. The control unit processes this feedback signal and automatically adjusts the maximal tipping pressure accordingly. This feedback mechanism enables the system to adapt to varying inclination angles and load conditions while maintaining relatively simple control architecture, as the automation handles the complexity of real-time adjustments.
Data Source
AI summary
A method for tipping a load by a working machine is provided. The working machine includes a load carrier and at least one lift cylinder adapted to raise the load carrier for tipping the load. The method includes obtaining a measure of the inclination angle of the working machine, where the inclination of the working machine is such that the rear end of the working machine is higher than the front end thereof, allowing a first maximal tipping pressure to the lift cylinder for raising the load carrier when the inclination angle is smaller than a predefined inclination angle, and allowing a second maximal tipping pressure to the lift cylinder for raising the load carrier when the inclination angle is greater than the predefined inclination angle, and where the second maximal tipping pressure exceeds the first maximal tipping pressure. A tipping device, a working machine comprising such a tipping device, a computer program and a computer program product are also provided.