Engine Speed Control Using Power Ratio Maps
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Solution Overview
Problem
Existing engine control systems face challenges in efficiently managing engine speed to meet both efficiency targets and sudden power demands from ancillary systems in vehicles, leading to delays and compromised efficiency.
Innovation Solution
A control process and system that calculates current engine power, determines minimum engine speed based on engine maps, monitors power requests, and adjusts engine speed using a power ratio map to quickly respond to demands while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine controller reacts to power demands from ancillary systems, then the power demand is met, but the engine speed increases unnecessarily and efficiency is compromised
Solution Approach 1:
The system pre-calculates and stores engine maps that define the optimal engine speed for any given power demand before the actual demand occurs. When a power demand from ancillary systems is detected, the controller refers to the pre-stored engine map to determine the appropriate engine speed, eliminating the need for reactive speed increases and maintaining optimal efficiency.
2Power
If the engine controller increases engine speed to meet power demands, then the power demand is satisfied, but the engine operates at higher than necessary speed
Solution Approach 1:
The engine map is pre-calculated and stored, defining the optimal engine speed for any power demand scenario. When power is needed, the system retrieves the pre-determined optimal speed from the map rather than reacting by increasing speed, ensuring the engine operates at the most efficient point for the required power output.
3Power
If the engine controller reacts to power requests, then the power demand is met, but there is a delay in power delivery
Solution Approach 1:
The engine map is pre-calculated and stored in the controller memory before operation. When a power request occurs, the controller immediately queries the pre-stored map to determine the required engine speed, eliminating reaction delays and enabling instant response to power demands from ancillary systems.
Data Source
AI summary
A control process for controlling an engine speed governor of an engine is provided. The process comprises the steps of calculating the current engine power being developed by the engine, and determining an appropriate engine speed for the current engine power based upon a first engine map. The process then instructs the speed governor to adjust the engine speed in accordance with the first map if required. The process monitors for desired engine power requests, and calculates a power ratio of desired engine power versus current engine power upon receiving a desired engine power request. The process then establishes an engine speed adjustment value based upon a second engine map of power ratio versus speed adjustment value, and instructs the speed governor to adjust the engine speed in accordance with the speed adjustment value. A speed governor system incorporating the control process, and a work machine or vehicle incorporating such a system are also provided.