Machine Control System Preventing Power Source Stall
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Solution Overview
Problem
In machines like loaders and tractors, during deceleration, the power source can be driven above the desired speed by the traction assembly through the transmission assembly, leading to a governor cutting fuel supply, potentially causing the power source to stall when encountering loads like grades or obstacles, especially if it enters a zero fuel condition.
Innovation Solution
A control system that includes a processor communicating with the power source and transmission assembly, determining if the power source is in a potential stall condition based on actual and requested speeds, and proactively requesting fuel supply to anticipate increasing loads, thereby preventing stalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the governor cuts fuel supply to reduce power source speed above desired speed, then the power source speed is controlled to desired speed, but the power source may stall when encountering loads
Solution Approach 1:
The control system performs preliminary action by detecting potential stall conditions before they occur and proactively supplying fuel to the power source in advance. The processor monitors the difference between actual and requested speeds, and when it detects that the governor has cut fuel supply during deceleration, it preemptively requests fuel supply to prevent the power source from stalling when loads are encountered.
2Speed
If the governor cuts fuel supply to control power source speed, then speed control is achieved, but the machine loses power delivery capability when loads are encountered
Solution Approach 1:
The control system implements feedback by continuously monitoring the actual power source speed and comparing it with the requested speed. The processor receives feedback from the governor's fuel supply decisions and uses this information to determine when potential stall conditions exist, enabling the system to adjust fuel supply proactively to maintain both speed control and power delivery capability.
Data Source
AI summary
A control system for a machine may include a processor configured to communicate with a power source. The processor may also be configured to communicate with a transmission assembly. The processor may be configured to determine whether the power source is in a potential stall condition based at least in part on an actual speed of the power source and a requested speed of the power source. If the power source is in the potential stall condition, the processor may be configured to request that fuel be supplied to the power source although the fuel is not currently required by the power source, in anticipation of an increase in load on the machine.