Crankshaft Angle-Based Vibration Suppression Control
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Solution Overview
Problem
Existing control systems for active vibroisolating support devices struggle to accurately initiate vibration suppression processes in sync with rolling natural vibrations of the engine, leading to ineffective suppression of vibrations transmitted to the vehicle body due to variations in engine rotational acceleration caused by different starting torques and types of engine starters.
Innovation Solution
A control apparatus that uses a crankshaft rotational position acquiring unit to determine the precise rotational position of the crankshaft, allowing the actuator to initiate the vibration suppressing control process at a predetermined rotational position, ensuring timely and accurate suppression of rolling natural vibrations, regardless of engine starter type or starting torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration suppressing control process is initiated based on engine rotational speed, then the control can be started, but the timing deviates from the actual rolling natural vibration occurrence, reducing suppression effectiveness
Solution Approach 1:
The patent replaces the engine rotational speed-based timing mechanism with a crankshaft angle-based timing mechanism. The crankshaft angle is a direct mechanical position parameter that can be measured precisely by sensors (e.g., crankshaft position sensor), allowing accurate synchronization of the vibration suppressing control process with the actual rolling natural vibration occurrence regardless of variations in engine starter type or starting torque.
2Adaptability or versatility
If the control system uses engine rotational speed to determine vibration beginning time, then it can operate with existing sensors, but the gradient variation in rotational speed causes timing inaccuracy
Solution Approach 1:
The patent changes the control parameter from engine rotational speed to crankshaft angle. The crankshaft angle is a positional parameter that increases linearly and predictably during engine rotation, providing a stable and accurate reference for timing the vibration suppressing control process. This parameter change eliminates the gradient variation problem inherent in rotational speed measurements, as the angle progression is uniform regardless of acceleration variations caused by different engine starters or starting torques.
Data Source
AI summary
A control apparatus includes an actuator ECU for controlling a plurality of ACMs. When an engine is started or restarted, the actuator ECU begins a vibration suppressing control process with the ACMs for suppressing vibrations transmitted to a vehicle body when a crankshaft angle, which is represented by a CRK pulse signal from a CRK sensor, reaches a beginning crankshaft angle.