Vehicle Vibration Control Device Phase Alignment
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Solution Overview
Problem
Existing vehicle vibration control systems fail to efficiently reduce vibration caused by damper torque due to mismatch between the phase adjustment time and the control cycle of the motor generator, leading to incomplete cancellation of damper torque vibrations.
Innovation Solution
A vehicle vibration control device that includes a motor generator connected to a power transmission path between the engine crankshaft and drive axle, with a motor generator control portion that calculates and adjusts the output torque to match the damper torque cycle by considering the control cycle time, using a compensation time calculation and torque correction mechanisms to ensure phase alignment between damper and reverse phase torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phase adjustment is executed by a control device without considering the control cycle, then the calculation of compensation time is simplified, but the shift between the cycle of damper torque and the cycle of motor torque remains, resulting in inefficient vibration reduction
Solution Approach 1:
The patent calculates the control cycle timing in advance and uses it to determine the optimal phase adjustment timing. By pre-calculating when the control cycle occurs and aligning the phase adjustment with this timing, the system ensures that the motor torque cycle matches the damper torque cycle, thereby efficiently reducing vibration while maintaining manageable control complexity
Solution Approach 2:
The patent incorporates feedback by continuously monitoring the actual output torque timing of the motor generator and adjusting the phase adjustment timing based on the control cycle. This feedback mechanism ensures that the phase adjustment remains synchronized with the control cycle, preventing timing shifts that would reduce vibration control effectiveness
2Productivity
If the compensation time is not aligned with the control cycle timing, then the phase adjustment can be applied immediately, but the torque cycles do not match, leaving residual vibrations
Solution Approach 1:
The patent pre-calculates the control cycle timing and determines the optimal phase adjustment timing in advance. By knowing when the control cycle occurs, the system can apply phase adjustment at the precise moment that ensures torque cycle matching, rather than applying it immediately without timing consideration
Solution Approach 2:
The patent applies phase adjustment periodically in synchronization with the control cycle. By aligning the phase adjustment timing with the periodic control cycle, the system ensures that motor torque is consistently generated at the correct phase relative to damper torque, eliminating residual vibrations through rhythmic, synchronized action
Data Source
AI summary
A vehicle vibration control device includes: a motor generator connected via a motor shaft to a power transmission path between a crankshaft of an engine and a drive axle that transmits a drive torque to a tire; and a motor generator control portion executing control of an output torque which is actually output by the motor generator. The motor generator control portion includes a damper torque calculation section that acquires information on a crank angle and a motor angle to calculate a damper torque generated by a damper, an explosion cycle calculation section, a reverse phase torque calculation section, a delay time calculation section, a compensation time calculation section, a first compensation time calculation section, a torque correction amount calculation section, and a command output section.