Power Generation Controller Noise Immunity via Command Storage
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Solution Overview
Problem
Noise from vehicle engines can corrupt binary pulse train signals transmitted to power generation voltage controllers, leading to suboptimal control of vehicle generators due to undetected errors in the signals, which can result in erroneous control until the next valid signal is received.
Innovation Solution
A power generation controller that receives and holds control commands from an external unit, specifically controlling the excitation current of a generator when the engine is stopped to prevent noise interference, and includes features like gradual-excitation time, maximum power increase, and temperature compensation commands to ensure reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power generation voltage controller continuously receives control commands from the engine ECU during engine operation, then the control responsiveness is improved, but noise from the engine ignition device corrupts the binary pulse train signal causing control errors
Solution Approach 1:
The controller prestores multiple control commands (first through fourth commands) in memory before they are needed. When noise corrupts an incoming signal, the controller can retrieve previously stored valid commands instead of executing erroneous real-time signals, thus maintaining reliability while preserving responsive control capability.
2Stability of the object's composition
If the controller uses previously received control commands when error is detected, then control stability is improved, but the controller cannot perform optimum control during engine operation
Solution Approach 1:
The controller prestores multiple different control commands corresponding to different operating conditions (gradual excitation, maximum power increase, normal operation, etc.) in advance. When the engine is stopped, the controller receives and validates new commands for future use. When the engine runs, it executes the prestored commands that were validated before engine start, ensuring both stability and optimality.
Solution Approach 2:
The controller dynamically switches between executing prestored commands during engine operation and receiving fresh commands when the engine is stopped. This dynamic adaptation allows the system to maintain optimal control across different operating phases while ensuring stability during critical engine running periods.
3Adaptability or versatility
If the controller receives control commands during engine operation, then real-time control capability is improved, but noise-induced erroneous control occurs until the next valid signal is received
Solution Approach 1:
The controller receives and validates control commands in advance when the engine is stopped (when no ignition noise is present), storing them in memory. This preliminary validation ensures command accuracy before the engine starts, preventing noise-induced errors while maintaining the ability to execute control actions once the engine is running.
Solution Approach 2:
The controller uses an intermediate storage mechanism (memory holding multiple prestored commands) between the engine ECU and the excitation current control. This intermediary buffer allows the system to decouple real-time signal reception from control execution, enabling validation during noise-free periods and execution during operation without direct noise interference.
Data Source
AI summary
The power generation controller includes a control command receiving section receiving a control command transmitted from an external control unit for controlling an internal combustion engine, a control command holding section holding the control command received by the control command receiving section, and an excitation current control section controlling an excitation current of a generator driven by the internal combustion engine on the basis of the control command held by the control command holding section. The excitation current control section is configured to control the excitation current on the basis of a control command transmitted from the external control unit when the internal combustion engine is in a stopped sate.