Mobile Work Machine Operating-Mode Engine Speed Adaptation
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Solution Overview
Problem
Current mobile hydraulic work machines, such as hydraulic excavators, face inefficiencies due to constant diesel engine speed and hydraulic power generation that does not adapt to specific operating modes, leading to increased power losses and fuel consumption.
Innovation Solution
A mobile work machine with a control device that recognizes specific operating modes and adjusts the engine speed and hydraulic power generation to match the required power needs, optimizing engine operation by reducing throttle and power losses through adaptive speed control and volume flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diesel engine operates at constant regulated output speed, then the machine can maintain readiness for any work phase, but power losses increase and fuel consumption rises due to mismatched power generation with actual work requirements
Solution Approach 1:
The patent applies dynamics by transitioning from constant engine speed to variable engine speed that adapts to different work phases. The control device dynamically adjusts the engine speed based on the currently active work phase, allowing the system to be both reliable (ready for any work) and energy-efficient (matching power generation to actual needs).
Solution Approach 2:
The patent changes the parameter of engine speed from constant to variable. By modifying the engine speed parameter according to the work phase requirements, the system reduces power losses while maintaining the capability to perform any work phase, thus resolving the contradiction between reliability and energy loss.
2Power
If the hydraulic power generation unit conveys hydraulic volume proportional to constant engine speed, then the system maintains constant power availability, but unnecessary hydraulic power is generated and lost due to mismatch with actual work phase requirements
Solution Approach 1:
The patent makes the hydraulic volume flow dynamic by linking it to variable engine speed rather than constant speed. The hydraulic power generation unit now adapts its output to match the actual power requirements of different work phases, reducing unnecessary hydraulic power generation and associated losses while maintaining adequate power availability.
Solution Approach 2:
The patent changes the parameter of hydraulic volume flow from constant (proportional to constant engine speed) to variable (proportional to adaptive engine speed). This parameter change ensures that hydraulic power generation matches actual work requirements, eliminating the contradiction between power availability and energy loss.
3Use of energy by moving object
If the engine speed is dynamically adapted to match required hydraulic power, then fuel consumption decreases and efficiency improves, but the system complexity increases due to control device requirements
Solution Approach 1:
The control device serves multiple functions: it identifies work phases, determines required hydraulic power, and adjusts engine speed accordingly. By making the control device multi-functional, the patent reduces the need for separate dedicated components for each function, thereby managing system complexity while achieving dynamic engine speed adaptation and improved fuel efficiency.
4Use of energy by moving object
If different engine performance maps are used to deploy the engine, then the engine can operate in regions of better efficiencies, but the control complexity increases due to map selection and adaptation requirements
Solution Approach 1:
The patent applies dynamics by implementing dynamic selection of engine performance maps based on the current work phase. Rather than using a single static performance map, the system dynamically switches between different maps to keep the engine operating in high-efficiency regions, accepting the necessary control complexity as a trade-off for significant efficiency improvements.
Data Source
AI summary
The present invention relates to a mobile work machine, in particular a hydraulic excavator, which comprises an engine for driving the mobile work machine, a hydraulic power generation unit which is coupled to the engine and is designed to convey a hydraulic volume in a manner which is dependent on a rotational speed of the engine, and a plurality of hydraulic elements which can be actuated by way of the conveyed volume of the hydraulic power generation unit and are assigned to various functions of the mobile work machine. The machine is characterized by a control unit for detecting a defined operating mode of the mobile work machine, wherein the control unit is designed to set the setpoint rotational speed of the engine in a manner which is dependent on the detected defined operating mode.