Motor Torque Phase Correction for Damper Vibration Reduction
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Solution Overview
Problem
Conventional motor control devices fail to accurately estimate damper torque in configurations with an intermediate inertial member, leading to ineffective reduction of vibrations caused by damper torque, as they only consider the torsion angle between the input and output inertial members without accounting for the intermediate member's characteristics.
Innovation Solution
A motor control device with a hardware processor that calculates damper torque by considering the torsion angles between the input, intermediate, and output inertial members, and adjusts the motor torque command to correct for phase shifts, using sensors and maps to account for engine rotations and transmission speeds, thereby accurately estimating and reducing damper torque-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional damper torque estimation method is used (considering only torsion angle between input and output inertial members), then device complexity is reduced, but measurement precision of damper torque deteriorates
Solution Approach 1:
The patent segments the damper system into three distinct inertial members (input, intermediate, and output) and calculates torsion angles for each segment separately. By dividing the complex three-inertial-member system into manageable segments with individual torsion angle calculations, the system achieves precise damper torque estimation without overwhelming complexity. The control device computes torsion angles θ1 (input-intermediate) and θ2 (intermediate-output) independently, then combines them to determine total damper torque.
2Object-affected harmful factors
If damper configuration with intermediate inertial member is adopted, then vibration reduction capability is improved, but damper torque estimation accuracy deteriorates
Solution Approach 1:
The patent implements feedback by using detected torsion angles θ1 and θ2 from the intermediate inertial member to continuously adjust and calculate the damper torque. The control device receives feedback signals from sensors monitoring the rotational positions of all three inertial members, processes this feedback information through the torsion angle calculations, and generates corrected motor torque commands that account for the intermediate member's characteristics, thereby maintaining accurate torque estimation in the enhanced damper configuration.
3Object-affected harmful factors
If motor torque is adjusted to counteract damper torque, then vibration reduction effectiveness is improved, but control precision requirements increase
Solution Approach 1:
The patent applies preliminary action by calculating the required phase correction amount before generating the motor torque command. The control device determines the phase difference between the crankshaft and motor shaft, pre-calculates the necessary correction amount based on the detected torsion angles, and then applies this correction in advance to the motor torque command. This preliminary phase correction ensures that the motor torque is precisely aligned to counteract damper torque fluctuations, reducing drive shaft torque variations without requiring real-time high-precision adjustments.
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
The solution effectively reduces vibrations by accurately estimating damper torque and adjusting motor torque to counteract phase shifts, improving the reduction of drive shaft torque fluctuations and enhancing damping control in vehicles with intermediate inertial members.
Implementation Method 1
an intermediate inertial member connected to the input inertial member via at least a first elastic member (211), and an output inertial member connected to the intermediate inertial member via at least a second elastic member (212)
Data Source
AI summary
A motor control device which is an example of the present disclosure includes a hardware processor configured to: calculate damper torque on a basis of a difference between a crank angle and a motor angle; calculate, on a basis of the damper torque, reversed phase torque in reverse phase to the damper torque; calculate a correction amount for a phase of the reversed phase torque on a basis of a difference between a first value corresponding to a torsion angle between an input inertial member and an output inertial member and a second value corresponding to a torsion angle between an intermediate inertial member and the output inertial member; and output a motor torque command to be provided to a motor generator on a basis of the reversed phase torque a phase of which has been corrected in accordance with the correction amount.