Hybrid Vehicle Vibration Control via Phase Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid electric vehicles with two-cylinder engines experience excessive vibrations, which current methods fail to adequately address for improved fuel efficiency and reduced energy waste.
Innovation Solution
An apparatus and method that include a reference signal generator, speed calculator, vibration extractor, variable filter, phase calculator, phase shift compensator, synchronization signal generator, inverse phase signal generator, and torque generator to calculate and compensate for vibration signals, reducing engine vibrations by controlling the phase and amplitude of reference signals corresponding to harmonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a two-cylinder engine is used to improve fuel efficiency, then fuel efficiency is improved, but vibration becomes excessive
Solution Approach 1:
The system generates a counter-vibration signal before the actual vibration occurs by predicting the vibration based on motor position and speed. The counter-vibration signal is injected into the motor control to preemptively cancel out the harmful vibrations from the two-cylinder engine, allowing fuel efficiency improvement without suffering from excessive vibration.
Solution Approach 2:
The system converts the harmful vibration signals into useful information by extracting vibration characteristics from motor current signals. These extracted vibration signals are then used to generate counter-vibration commands, transforming the harmful vibration into a beneficial control signal that improves overall system performance while maintaining the fuel-efficient two-cylinder configuration.
2Object-affected harmful factors
If vibration reduction systems are added to the hybrid electric vehicle, then vibration is reduced, but device complexity increases
Solution Approach 1:
The vibration reduction system utilizes the existing motor and its control unit to perform multiple functions: both driving the vehicle and generating counter-vibration signals. The motor controller serves dual purposes by simultaneously controlling motor torque for vehicle propulsion and injecting counter-vibration signals, eliminating the need for separate vibration reduction hardware and reducing overall device complexity.
Solution Approach 2:
The system uses the motor's own current signals to detect vibrations and generates counter-vibration commands through the same motor controller. The motor essentially monitors itself for vibrations and self-corrects by adjusting its own control signals, eliminating the need for external sensors and control systems, thereby reducing device complexity while achieving vibration reduction.
Data Source
AI summary
An apparatus for reducing vibrations of a two-cylinder engine for a hybrid electric vehicle includes a reference signal generator for generating a first reference signal and a first reference phase, a speed calculator for calculating a speed of the motor based on the position of the motor, a vibration extractor for extracting a first vibration signal based on the speed of the motor, a variable filter, a filter coefficient updater, a phase calculator, a phase shift compensator, a synchronization signal generator for generating a first synchronization signal synchronized with the first vibration signal based on a first reference phase transferred from the reference signal generator, the second phase difference transferred from the phase calculator and the first compensation value transferred from the phase shift compensator, an inverse phase signal generator, and a torque generator for generating a final command torque based on the first inverse phase signal.