Machine Control Direction Shift Fuel Threshold
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Solution Overview
Problem
Existing machine control systems face challenges in maintaining engine speed during propulsion direction changes, as the current methods rely on a single predetermined threshold for fuel resumption, which is not effective for varying load conditions, leading to delays in torque generation and potential engine performance issues.
Innovation Solution
A method and system that adjust the fuel supply based on the power source's speed during the retarding phase, setting a first threshold speed based on the maximum speed encountered during the retarding phase to ensure timely resumption of fueling and prevent engine speed from falling below a minimum desired speed, thereby optimizing torque generation during acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single predetermined threshold speed is used for resuming fueling, then the control system is simple to implement, but the engine speed may fall below minimum desired speed under varying load conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a static predetermined threshold to a dynamic threshold that adapts to varying load conditions. The threshold speed for resuming fueling is now determined based on real-time parameters including maximum engine speed during retarding phase, acceleration load, and rate of speed decline, allowing the control system to optimize fuel resumption timing for each specific operating condition
Solution Approach 2:
The patent implements parameter changes by modifying the threshold speed parameter from a fixed value to a calculated value that changes based on operating conditions. The new threshold incorporates multiple parameters (maximum speed during retarding, acceleration load, rate of speed decline) to dynamically adjust the fuel resumption trigger point, ensuring reliable engine speed maintenance across different load scenarios
2Power
If fuel supply is reduced during retarding phase, then the retarding capability of the engine is improved, but the engine speed may continue to decline during acceleration phase
Solution Approach 1:
The patent applies preliminary action by calculating and setting the fuel resumption threshold speed in advance, before the engine speed actually declines to problematic levels. The control system determines the threshold based on predicted acceleration requirements and engine characteristics, then proactively resumes fueling when speed approaches this pre-calculated threshold, preventing excessive speed decline before it occurs
Solution Approach 2:
The patent implements feedback by continuously monitoring engine speed during both retarding and acceleration phases, and using this real-time data to determine when to resume or increase fuel supply. The control system compares actual speed against the calculated threshold and adjusts fueling accordingly, creating a closed-loop control that responds to actual engine behavior rather than following a fixed schedule
3Power
If there is a delay in resuming fuel supply during acceleration phase, then the retarding phase is completed effectively, but torque generation is delayed and engine performance is adversely affected
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the fuel resumption threshold based on acceleration load requirements. Higher acceleration loads result in higher calculated thresholds, triggering earlier fuel resumption and reducing torque generation delay. This parameter adaptation ensures that the retarding phase is completed effectively while minimizing performance loss during the transition to acceleration
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 approach improves engine performance by ensuring adequate torque is generated promptly, reducing delays and maintaining engine speed within desired limits across different propulsion direction change events, enhancing the overall efficiency and reliability of the power system.
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
the control system places an acceleration load on the engine, which causes the engine to transfer to the transmission, any power absorbed during the retarding phase
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 directing power into a power source and reducing a supply of fuel to the power source while directing power into the power source. The method further includes basing a first threshold speed on a speed of the power source produced by directing power into the power source and increasing the supply of fuel to the power source when the speed of the power source falls below the first threshold speed.