Working Machine Controller Tilt Threshold Actuation
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Solution Overview
Problem
Existing working machines with load handling apparatuses face inefficiencies in preventing tipping, as they rely on constantly running hydraulic pumps to restrict hydraulic fluid flow, which wastes energy and is not suitable for electric machines without constant engines.
Innovation Solution
A controller that uses an electrically driven actuator assembly, receiving tilt signals to control an electrical drive element, such as an electric motor or actuator, to manage the load handling apparatus efficiently, reducing energy consumption by stopping or adjusting the actuator movement when a tilt threshold is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic pump is used to restrict hydraulic fluid flow to prevent tipping, then tipping prevention is achieved, but energy consumption increases due to constant pump operation
Solution Approach 1:
The hydraulic pump operates periodically rather than continuously - it runs only when the load handling apparatus needs to move and stops when the tilt threshold is reached or when no movement is required. This periodic operation maintains tipping prevention capability while dramatically reducing energy consumption compared to constant operation.
Solution Approach 2:
The control system extracts and separates the tipping prevention function from the continuous hydraulic pump operation. By using a controller that monitors tilt signals and independently manages pump operation, the system achieves tipping prevention without requiring the pump to run constantly, thus removing the unnecessary energy consumption aspect.
2Ease of operation
If a hydraulic pump is used to control actuator movement, then load handling control is achieved, but the system complexity increases due to hydraulic components
Solution Approach 1:
The patent replaces parts of the traditional hydraulic control system with an electrically driven actuator assembly. The electric motor directly drives the actuator, eliminating the need for a hydraulic pump, hydraulic fluid, and complex hydraulic valves. This substitution maintains full load handling control capability while significantly reducing system complexity and removing the source of continuous energy consumption.
Solution Approach 2:
The controller serves multiple functions: it monitors tilt signals for tipping prevention, controls the electrically driven actuator for load handling, and manages the electrical drive element. By consolidating these functions into a single control unit, the system reduces overall complexity while maintaining ease of operation.
3Reliability
If the lifting arm movement is restricted by diverting hydraulic fluid, then tipping is prevented, but hydraulic fluid is wasted into the tank
Solution Approach 1:
The electrically driven actuator assembly replaces the hydraulic fluid-based control system. Instead of diverting hydraulic fluid into a tank, the electric motor simply stops driving the actuator when the tilt threshold is reached. This eliminates hydraulic fluid waste entirely while maintaining effective tipping prevention through direct electrical control.
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 enhances energy efficiency by directly controlling the electric actuator, saving energy and extending battery life in electric working machines, while effectively preventing tipping without the need for constant hydraulic pump operation.
Implementation Method 1
an electric motor configured to drive a hydraulic pump
Implementation Method 2
an electric motor configured to drive a hydraulic pump that supplies hydraulic fluid to a hydraulic actuator
Data Source
AI summary
A working machine has a body and a load handling apparatus coupled to the body. The load handling apparatus is moveable with respect to the body by an electrically driven actuator assembly. A controller is configured to receive a tilt signal representative of a moment of tilt of the working machine and issue a control signal configured to control an electrical drive element of the electrically driven actuator assembly based on the value of the tilt signal relative to a tilt threshold.