Driving Source Control via Phase-Lead Torsional Fluctuation Detection
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Solution Overview
Problem
Existing driving source control apparatuses are ineffective in properly reducing vibrations in driving apparatuses due to their inability to distinguish between torsional and road surface-induced fluctuations in engine rotation speed, leading to incomplete correction of target torque.
Innovation Solution
A driving source control apparatus that employs a phase-lead process to compute the period and amplitude of torsional fluctuations, applying a correction torque opposite in phase to the fluctuations when the amplitude exceeds a predetermined threshold, thereby reducing vibrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving source control apparatus corrects target torque based on rate of change in difference between engine rotation speed and average rotation speed, then vibrations are reduced, but the apparatus cannot properly reduce vibrations when fluctuations are caused by road surface input rather than torsional resonance
Solution Approach 1:
The patent segments the rotation speed fluctuation analysis into two distinct components: torsional fluctuations (detected through phase-lead processing of the difference between actual and average rotation speeds) and road surface-induced fluctuations (detected through acceleration sensor data). By separating these components, the system can selectively apply correction only to torsional resonance, avoiding incorrect corrections for road surface vibrations.
Solution Approach 2:
The patent introduces an acceleration sensor as an intermediary device to detect road surface-induced vibrations. This sensor provides independent measurement data that serves as a reference to distinguish between torsional and non-torsional fluctuations, enabling the ECU to make accurate decisions about when to apply torque correction.
2Ease of operation
If the apparatus applies correction torque based on computed torsional fluctuations, then vibrations are reduced, but correction may be applied incorrectly when fluctuations are not due to torsional resonance
Solution Approach 1:
The patent implements a feedback mechanism where the ECU continuously monitors both the computed torsional fluctuations (from rotation speed difference with phase-lead processing) and the acceleration sensor data. This dual-feedback system allows the control apparatus to verify the nature of fluctuations before applying correction, ensuring that correction torque is only applied when torsional resonance is actually present.
Solution Approach 2:
The patent performs preliminary analysis by computing the phase-lead processed difference between actual and average rotation speeds before applying any correction. This preliminary computation, combined with acceleration sensor verification, ensures that the system only initiates correction when torsional resonance is confirmed, preventing premature or incorrect corrections.
Data Source
AI summary
A period and amplitude of torsional fluctuations of a drive-train to be obtained by applying a phase-lead process, which is a process of advancing a phase by a predetermined amount, to a difference between a rotation speed of a driving source and a rotation speed of the driving source, computed from a rotation speed of a drive shaft, are repeatedly computed. When the computed amplitude of the torsional fluctuations in a predetermined period becomes greater than or equal to a predetermined amplitude at least two times consecutively, predetermined control is executed. In the predetermined control, the driving source is controlled at a torque obtained by adding a correction torque opposite in phase to the torsional fluctuations to a target torque. As a result, vibrations of a driving apparatus are further properly reduced.