Engine Mount Control for Idle-Stop Vibration Suppression
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Solution Overview
Problem
Existing engine mount control systems struggle to effectively suppress engine vibration during idling stop and restart, especially when the engine is not completely stopped, leading to inadequate vibration damping performance.
Innovation Solution
An engine mount control apparatus that implements a first restart time control when the engine is completely stopped and a second restart time control based on engine rotational speed or position when it is not, using actuators to manage vibration suppression, with the option to acquire rotational position or speed data from higher precision sensors like traction or starter motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the crankshaft rotational position at the time of an idling stop is used for vibration control, then the control can be initiated, but since the crankshaft rotational position changes due to continued subsequent rotation of the engine, adequate vibration damping performance cannot be obtained
Solution Approach 1:
The control apparatus performs preliminary action by acquiring the crankshaft rotational position before the engine is completely stopped (during the deceleration phase), and uses this pre-acquired position data to set the operation start timing for vibration suppression control. This allows the control to be properly initiated even when the engine restarts before coming to a complete stop, resolving the contradiction between ease of operation and reliability.
2Measurement precision
If the system waits until the engine rotational speed becomes zero to acquire the crankshaft rotational position, then accurate position data can be obtained, but the engine is restarted before the rotational speed becomes zero, making the control technique inapplicable
Solution Approach 1:
The system performs preliminary acquisition of the crankshaft rotational position during the deceleration phase (before the engine stops completely), rather than waiting for the rotational speed to reach zero. This preliminary action ensures that the control technique remains applicable in modern vehicles with idling stop control, where the engine may be restarted before coming to a complete stop.
Solution Approach 2:
The control apparatus dynamically adjusts the timing for acquiring crankshaft rotational position based on the actual engine state. Instead of using a fixed criterion (waiting for zero rotational speed), the system acquires the position at an appropriate time during deceleration and uses this data to dynamically set the operation start timing, making the control adaptable to various restart scenarios.
3Use of energy by moving object
If the engine is restarted before the rotational speed becomes zero, then fuel consumption is improved, but the existing control technique cannot be used, leading to inadequate vibration suppression
Solution Approach 1:
The control apparatus performs preliminary acquisition of crankshaft rotational position data during the deceleration phase, before the engine restart is triggered. This pre-acquired data is then used to set the operation start timing for vibration suppression control, ensuring that the control remains effective even when the engine is restarted before coming to a complete stop, thus maintaining vibration suppression capability while allowing fuel-efficient early restart.
Data Source
AI summary
Provided are: an engine-mounted controller capable of being suitably used in a vehicle that carries out an idle-stop operation while the vehicle is moving; and a vehicle. An engine-mounted controller of a vehicle determines whether or not an engine is in a completely stopped state when an idle-stop operation is canceled. If the controller determines that the engine is in a completely stopped state, a first control operation for suppressing the transmission of engine vibrations associated with engine idling is executed on the assumption that the engine is in a completely stopped state, and if the controller determines that the engine is not in a completely stopped state, the first control operation is prohibited when the engine restarts.