Engine Speed Controller for Power Generation Tendency
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Solution Overview
Problem
Existing engine control systems face inefficiencies in managing engine speed during idling operations, leading to wasteful energy consumption and adverse effects on battery life due to simplistic structures that do not account for the states of uncontrolled devices and rapid control responses.
Innovation Solution
An engine speed controller system that includes an engine controller, generator controller, and auxiliary device controller, which performs feedback control to maintain engine speed at a target value by evaluating power generation and torque tendencies, requesting adjustments to engine speed based on calculated power generation and torque imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine speed is increased to boost electric power generation when battery charged level is low, then the electric power generation is improved, but the control response becomes excessively quick and causes hunting
Solution Approach 1:
The system performs preliminary evaluation of power generation tendency by comparing requested power generation with present power generation before executing engine speed changes. This advance assessment prevents excessive quick response and hunting by preparing control actions in advance based on predicted power generation needs rather than reacting to immediate battery charged level changes
Solution Approach 2:
The system implements feedback control by continuously monitoring both requested and present power generation, and adjusting engine speed based on the evaluated tendency of power generation. This feedback mechanism ensures stable control response by making adjustments based on actual system state rather than isolated threshold triggers
2Duration of action of stationary object
If the engine speed is changed in response to small changes in battery charged level to prevent adverse influence on battery life, then the battery life is protected, but the control becomes excessively sensitive and causes hunting
Solution Approach 1:
The system uses feedback control that evaluates the tendency of power generation by comparing requested and present power generation levels. This approach protects battery life through appropriate engine speed adjustments while maintaining control stability by basing decisions on comprehensive power generation assessment rather than isolated battery charged level changes
Solution Approach 2:
The system changes the control parameter from directly responding to battery charged level to responding to evaluated power generation tendency. This parameter transformation reduces excessive sensitivity to small battery charged level changes while still achieving the goal of protecting battery life through appropriate engine speed management
3Device complexity
If the idling speed is controlled by operating only the intermittent ON/OFF signal of the auxiliary device, then the control structure is simplified, but the controllability is not excellent and the engine speed may be wastefully operated
Solution Approach 1:
The engine speed control system serves multiple functions simultaneously: it controls engine speed based on power generation needs, protects battery life, and prevents wasteful operation. By making the engine speed control universal and responsive to evaluated power generation tendency, the system achieves excellent controllability without requiring complex auxiliary device control structures
Solution Approach 2:
The system enables the engine speed control to self-adjust based on evaluated power generation tendency rather than relying on external auxiliary device ON/OFF signals. This self-service capability improves controllability by making the engine speed control autonomous and responsive to actual power generation needs while maintaining simple control structure
Data Source
AI summary
An engine controller controls an engine, which drives a generator, an auxiliary device, and a vehicle. The generator generates electricity, and supplying the electricity to a battery and a plurality of current consumers. A generator controller controls the generator. An auxiliary device controller controls the auxiliary device. An electric power generation calculation unit calculates one of a requested power generation of the generator and a present power generation of the generator. An engine speed changing unit evaluates tendency of power generation on the basis of the one of the requested power generation and the present power generation. The engine speed changing unit requests increase or decreases in the engine speed when the engine speed changing unit determines the power generation to be inclined toward shortage or excess.