Active Vibration Isolating Support for Engine Starting
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Solution Overview
Problem
Existing active vibration isolating support apparatuses are ineffective in reducing transient vibrations during engine starting due to delayed control responses, particularly because the working point of the vibration isolating support apparatus cannot move to its full range of displacement before the engine begins self-revolution, leading to inadequate absorption of large vibrations.
Innovation Solution
The apparatus includes active mounts with actuators that receive a predetermined current before engine ignition to move the working point to the middle of its vertical displacement range, and control the actuator based on engine vibration, ensuring effective vibration isolation from the start of self-revolution by utilizing a linear solenoid actuator and adjusting the control instruction value based on crank angle and roll resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator control is started based on crank pulse sampling after engine starting, then the vibration isolating performance for stationary vibrations is improved, but the transient vibrations at engine starting cannot be reduced due to delayed control response
Solution Approach 1:
The control unit supplies a predetermined current to the actuator before engine ignition based on a starting control condition, moving the working point to a middle position of the vertical displacement range in advance. This preliminary action ensures the actuator is positioned optimally before transient vibrations occur, enabling immediate response when engine self-revolution begins without waiting for crank pulse sampling.
Solution Approach 2:
The system applies a predetermined current to the actuator in advance to position the working point at the middle of its displacement range, creating a preparatory state that counteracts the impending transient vibrations. This preliminary anti-action prevents the harmful effect of vibration transmission by ensuring the actuator is ready to respond immediately when the engine starts, rather than reacting after vibrations have already occurred.
2Device complexity
If the working point is positioned at one side of the vertical moving range before engine starting, then the actuator structure is simple, but the vertical range for vibration control is limited and transient vibrations cannot be effectively absorbed
Solution Approach 1:
The system dynamically adjusts the working point position of the actuator based on engine operating conditions. Before engine starting, the control unit supplies a predetermined current to move the working point to the middle of the vertical displacement range. During normal operation, the working point is adjusted based on vibration control requirements. This dynamic repositioning expands the available displacement range for vibration absorption without changing the actuator structure.
Solution Approach 2:
The control unit changes the current parameter supplied to the actuator based on engine operating conditions. By supplying a predetermined current before engine starting, the working point position parameter is changed to the middle of the vertical displacement range. This parameter change enables the actuator to utilize its full displacement range for absorbing transient vibrations, effectively resolving the limitation without increasing device complexity.
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
This solution enables the apparatus to stabilize the working point quickly and effectively absorb vibrations, reducing the transmission of roll resonance to the vehicle body from the beginning of engine self-revolution, thereby improving vibration isolation during engine starting.
Implementation Method 1
an actuator; and a control unit to drive the actuator to extend and contract periodically in response to a waveform of the vibration of the engine
Data Source
AI summary
An object of the present invention is to provide an active vibration isolating support apparatus to effectively reduce a transient vibration which occurs at the time of engine starting. In order to achieve the above object, an active vibration isolating support apparatus for suppressing a vibration transmitted to a vehicle body including: active mounts to elastically support a load of an engine in the vehicle body each of which includes an actuator; and a control unit to drive the actuator to extend and contract periodically in response to a waveform of the vibration of the engine; in which the control unit supplies a predetermined current to the actuator based on a starting control condition, and starts a control of the actuator based on a control instruction value of a current in response to the vibration of the engine is provided.