Power System Directional Shift Management
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Solution Overview
Problem
Existing machine control systems face performance issues during propulsion direction changes, as they struggle to maintain engine speed and torque demand due to unsuitable operational maps and delays in fuel resumption, leading to unsatisfactory engine performance.
Innovation Solution
A power system that selects a power boost map in response to a propulsion direction change request, directing power into the power source and regulating its speed according to this map, thereby increasing the power rating and reducing the time spent below the minimum desired speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If fuel supply is reduced or cut off during retarding phase, then retarding capability is improved, but engine speed increases which may conflict with power dissipation
Solution Approach 1:
The system dynamically adjusts fuel supply timing based on the propulsion direction change phase. During retarding phase, fuel is cut off to maximize retarding capability. During acceleration phase, fuel is resumed or increased to meet torque demand. This dynamic timing adjustment resolves the contradiction by optimizing fuel supply for each phase's specific requirements.
Solution Approach 2:
The control system resumes or increases fuel supply before the engine speed drops below minimum desired speed during the acceleration phase. This preliminary action ensures adequate torque is available to meet acceleration demand without allowing engine speed to fall into an unsatisfactory range.
2Power
If fuel is resumed or increased during acceleration phase, then torque demand is met, but there is a delay before adequate torque is generated
Solution Approach 1:
The control system resumes or increases fuel supply in advance, before the engine speed drops below minimum desired speed or before torque demand becomes critical. This preliminary fuel resumption allows the engine to generate adequate torque without delay, preventing engine speed from falling into an unsatisfactory range and ensuring smooth acceleration.
3Use of energy by moving object
If a fuel economy map is used during non propulsion direction change events, then fuel efficiency is improved, but engine power is sacrificed which is needed during acceleration phase
Solution Approach 1:
The system dynamically switches between different operational maps based on the propulsion direction change phase. During normal operation, a fuel economy map is used to optimize fuel efficiency. During propulsion direction change events, particularly in the acceleration phase, the system switches to a power-oriented map that prioritizes engine power output over fuel economy, ensuring adequate torque is available when needed.
Solution Approach 2:
The control system changes operational parameters by switching between different maps (fuel economy map vs. power-oriented map) based on the propulsion direction change phase. This parameter change allows the system to optimize for fuel economy during normal operation and for power output during acceleration phases, resolving the contradiction between fuel efficiency and engine power requirements.
4Stability of the object's composition
If the power train operates according to a previously selected map during propulsion direction change, then operational consistency is maintained, but performance becomes unsatisfactory due to map mismatch
Solution Approach 1:
The system dynamically selects and switches between different operational maps based on the propulsion direction change phase. Instead of maintaining a fixed map selection, the control system adapts the operational map to match the current phase requirements (retarding phase, acceleration phase, or normal operation), thereby optimizing performance during direction changes while maintaining operational consistency through systematic map selection.
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
The power system improves engine performance during propulsion direction changes by increasing torque output and reducing the duration of suboptimal engine speed, enhancing the overall efficiency and effectiveness of the direction change process.
Implementation Method 1
a machine control system initially controls a power train to retard motion in the current direction. Typically, the retarding event is initiated by adjusting the transmission (e.g. downshifting) to drive power into the engine, thereby using parasitic losses to slow the machine down.
Implementation Method 2
If the engine is supplied with fuel during the retarding phase, the engine will generate power that can conflict with the power being dissipated.
Implementation Method 3
During the acceleration phase, the transmission no longer directs power into the engine, and the parasitic losses cause the engine slow down.
Data Source
AI summary
A method is provided for operating a power system. The method includes receiving an operator request for a propulsion direction change. The method also includes selecting a power boost map in response to the propulsion direction change request. The power boost map increases the power rating of a power source of the power system. In addition, the method includes directing power into the power source. The method further includes regulating the power system and accelerating a power source speed according to the power boost map when the power is no longer being directed into the power source.