Adaptive Open-Loop Control for Engine Vibration
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Solution Overview
Problem
Existing active vibration control systems for engine mounts require expensive and complex control units with additional sensors to tune neutralizing forces to the amplitude and frequency of engine-induced vibrations, making them inefficient.
Innovation Solution
An adaptive open-loop control system that determines operating modes based on engine parameters, using an integrated control module to selectively control active vibration systems without additional sensors, allowing the active vibration system to act as both a sensor and actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensors and complex control units are used to tune neutralizing force frequency to engine vibration frequency, then vibration cancellation effectiveness is improved, but system cost and complexity increase
Solution Approach 1:
The active engine mount serves dual functions: it acts as both the actuator generating neutralizing forces and as the sensor detecting engine vibrations. The electromagnetic actuator measures vibration frequency through its mechanical response while simultaneously generating the counteracting force, eliminating the need for separate sensing mechanisms and complex control units.
Solution Approach 2:
The system uses its own operational characteristics to achieve sensing functionality. The active engine mount's mechanical response to engine vibrations provides the sensing information needed to tune the neutralizing force frequency, allowing the system to self-regulate without external sensing components.
2Measurement precision
If additional sensors are employed to measure engine vibration frequency, then tuning accuracy of neutralizing force is improved, but system cost increases
Solution Approach 1:
The active engine mount's electromagnetic actuator performs both sensing and actuation functions. The same component that generates neutralizing forces also detects vibration frequency through its mechanical response characteristics, eliminating the need for separate sensors and reducing system cost.
Solution Approach 2:
The control module acts as an intermediary that processes the mechanical response signals from the active engine mount and translates them into appropriate control commands, enabling frequency tuning without requiring additional external sensing components.
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 reduces the need for additional sensors and complex control units, enabling efficient cancellation of engine-induced vibrations and noise while optimizing energy usage and cost.
Implementation Method 1
The electromagnetic actuator is electromagnetically driven and operable to generate a neutralizing force in response to forces transmitted to the chassis or body it is mounted on
Data Source
AI summary
Methods and systems are provided for controlling an active vibration system. In one embodiment, a method of controlling an active vibration system associated with an engine is provided. The method includes: receiving engine parameters indicating one or more engine operating conditions; determining an operating mode of the active vibration system to be at least one of a sensing mode and a force generation mode based on the engine parameters; and selectively controlling the active vibration system based on the operating mode.