Motor Control Apparatus for Damping Engine Torque Vibration
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Solution Overview
Problem
Existing engine vibration reduction technologies increase switching loss in inverters and struggle to predict engine torque variations during transient conditions, particularly when engine velocity transitions.
Innovation Solution
A motor control apparatus and method that predicts motor anti-phase torque by considering engine velocity, engine torque, ignition timing, and damping factor, using a processor to calculate weighting values based on piston position, angular acceleration, and velocity to operate the motor and cancel out engine torque vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If motor anti-phase torque control is implemented to reduce engine vibration, then engine vibration reduction performance is improved, but switching loss in inverter increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the motor anti-phase torque magnitude and timing based on engine operating conditions (engine velocity, engine torque, ignition timing). The controller modifies control parameters such as torque amplitude and phase angle to optimize vibration cancellation while minimizing inverter switching losses through efficient torque application timing.
Solution Approach 2:
The system implements dynamics by continuously adapting the motor anti-phase torque control strategy according to real-time engine operating conditions. The controller dynamically adjusts torque magnitude, timing, and duration based on detected engine velocity, torque, and ignition timing variations, enabling optimal vibration reduction across different operating regimes while energy efficiency is maintained.
2Object-affected harmful factors
If traditional motor control method is used to determine anti-phase torque, then engine vibration reduction is achieved, but prediction of engine torque variation under transient conditions is difficult
Solution Approach 1:
The patent applies preliminary action by using the damping factor to pre-characterize the damper's vibration suppression properties before transient conditions occur. The controller uses this pre-established damping factor information to predict and prepare appropriate anti-phase torque responses during transient engine velocity transitions, improving prediction accuracy of engine torque variations before they fully develop.
Solution Approach 2:
The system implements feedback by continuously monitoring engine velocity, engine torque, and ignition timing, then using this feedback information to adjust the motor anti-phase torque in real-time. The damping factor serves as a reference parameter that the controller compares against actual engine responses, enabling accurate prediction and correction of torque variations during transient conditions.
3Object-affected harmful factors
If engine damper is used to reduce vibration, then vibration damping is achieved, but manufacturing cost increases
Solution Approach 1:
The patent applies mechanics substitution by replacing the mechanical damper system with an electromagnetic motor-based active vibration control system. The motor generates anti-phase torque electronically controlled to cancel engine vibrations, eliminating or reducing the need for mechanical dampers and their associated manufacturing costs while maintaining vibration reduction effectiveness.
Solution Approach 2:
The controller serves as an intermediary that processes engine operating parameters (velocity, torque, ignition timing) and translates them into appropriate motor anti-phase torque commands. This intermediary control system enables the motor to effectively replace the mechanical damper's vibration cancellation function through intelligent torque management rather than direct mechanical damping.
Data Source
AI summary
A motor control apparatus and method for damping engine vibration are provided. The apparatus includes a data collection device that collects engine information and motor information and a processor that determines a magnitude of engine torque vibration using the engine information and the motor information. A weighting value is determined by determining a position of a piston in a cylinder of an engine, ignition timing, an engine angular acceleration, and an engine velocity. A motor arti-phase torque is calculated by reflecting the determined weighting value in the magnitude of the engine torque vibration and a motor is operated based on the motor anti-phase torque to cancel out the engine torque vibration.