Engine Torque Control for Powertrain Vibration Damping
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Solution Overview
Problem
Existing engine control systems fail to effectively suppress vibrations in the vehicle power train during sudden torque changes while maintaining driver-demanded acceleration, as they either suppress engine acceleration or lack detailed methods for output correction.
Innovation Solution
A control system for internal combustion engines that calculates and corrects the output torque to align with the center value of local rotational speed changes, using resonance period calculations and sinusoidal wave signals to phase-shift torque corrections, ensuring driver-demanded acceleration is maintained while damping vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-pass filtering is applied to engine rotational speed to suppress vibrations, then vibration suppression is improved, but engine acceleration is suppressed and driver-demanded acceleration cannot be obtained
Solution Approach 1:
The patent segments the rotational speed signal processing into two distinct components: low-pass filtering to extract the driver-demanded acceleration component, and high-pass filtering to extract the vibration component. By separating these components and applying different processing strategies to each, the system can suppress vibrations while preserving the intended acceleration signal.
Solution Approach 2:
The patent implements a feedback mechanism where the processed rotational speed signals (both low-pass and high-pass filtered) are fed back to the torque control system. The system continuously monitors the actual engine acceleration and adjusts the torque correction amount in real-time to maintain the desired acceleration while suppressing vibrations.
2Object-affected harmful factors
If engine output torque correction is performed to suppress vibrations, then vibration suppression is improved, but the method lacks detail and cannot maintain driver-demanded acceleration
Solution Approach 1:
The patent employs dynamic control by continuously adjusting the torque correction amount based on real-time detection of local maximum and minimum values in the high-pass filtered signal. The system adapts the correction magnitude and timing dynamically rather than using fixed parameters, allowing effective vibration suppression while maintaining responsiveness to driver demands.
Solution Approach 2:
The patent changes key parameters including the torque correction amount, the timing of correction application, and the filtering characteristics based on the detected vibration state. By dynamically modifying these parameters according to the actual engine operation conditions and vibration characteristics, the system achieves effective suppression without overly complex control logic.
3Object-affected harmful factors
If torque correction is applied during resonance, then vibration suppression is improved, but the correction timing and magnitude must be precisely controlled to maintain driver acceleration
Solution Approach 1:
The patent applies preliminary action by detecting the onset of resonance conditions through the high-pass filtered signal and preparing the torque correction in advance. The system identifies local maximum and minimum values that indicate resonance and applies correction before the vibration reaches its peak, allowing for more effective suppression with less aggressive correction amounts.
Solution Approach 2:
The patent utilizes the periodic nature of resonance vibrations by applying torque correction at regular intervals corresponding to the vibration cycle. The system targets specific phases of the vibration waveform (at local maximum and minimum points) and applies periodic correction actions that are synchronized with the resonance frequency, improving suppression effectiveness while maintaining precision.
Data Source
AI summary
A control system for an internal combustion engine, which controls an output torque of the internal combustion engine for driving a vehicle, is provided. An engine rotational speed is detected, and a change amount of the detected engine rotational speed is calculated. The output torque control amount of the engine is corrected so that the rotational speed change amount coincides with the center value of the local minimum value and the local maximum value of the rotational speed change amount. Specifically, a torque correction amount is calculated according to a torque value which is equal to half of a difference between peak vibration torque values corresponding to the local minimum value and the local maximum value of the rotational speed change amount, and an output torque control amount is corrected with the torque correction amount.