Idling-Stop Control Apparatus Engine Speed Differential Vibration
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Solution Overview
Problem
Vehicles experience uncomfortable vibrations when the engine is automatically restarted from an idling stop state, due to variations in engine speed, leading to body shaking and discomfort for occupants.
Innovation Solution
An idling-stop control apparatus that includes an auxiliary-machine controller, which regulates the drive state of an auxiliary machine, such as an alternator, to maintain a constant time differential value of engine speed during engine restart, thereby suppressing vibrations by adjusting the power generation load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engine is automatically restarted from an idling stop state, then the engine restarts quickly, but vehicle body vibrations increase causing occupant discomfort
Solution Approach 1:
The auxiliary machine controller applies a preliminary counteracting action by controlling the auxiliary machine to generate a load that opposes the engine's acceleration during restart. This prevents the harmful vibrations from occurring in the first place by maintaining constant engine speed differential, rather than allowing vibrations to develop and then correcting them
Solution Approach 2:
The controller changes the operational parameters of the auxiliary machine during engine restart. By adjusting the auxiliary machine's load characteristics and controlling its drive state, the system modifies the engine's acceleration profile to maintain constant speed differential, thereby suppressing vibrations while enabling quick restart
2Object-affected harmful factors
If the auxiliary machine load is adjusted to suppress vibrations, then vehicle body shaking reduces, but control system complexity increases
Solution Approach 1:
The auxiliary machine serves multiple functions: it provides necessary electrical load during engine operation and simultaneously acts as a vibration suppression mechanism during engine restart. By controlling the auxiliary machine's drive state, the system achieves both power generation and vibration control without requiring separate dedicated components
Solution Approach 2:
The control system continuously monitors engine speed and auxiliary machine operational state, using this feedback to adjust the auxiliary machine's load in real-time. This closed-loop control maintains constant engine speed differential during restart, effectively suppressing vibrations while adapting to changing operating conditions
Data Source
AI summary
An idling-stop control apparatus includes an idling-stop controller and an auxiliary-machine controller. The idling-stop controller is configured to automatically stop an engine to cause the engine to be in a state in which idling is stopped in a case where a predetermined condition for stopping idling is satisfied and configured to automatically restart the engine in a case where a predetermined condition for restarting the engine is satisfied. The auxiliary-machine controller is configured to control a drive state of an auxiliary machine that is to be driven by the engine. The auxiliary-machine controller is configured to control the drive state of the auxiliary machine that is driven by the engine such that, in a case where the engine is automatically restarted from the state in which idling is stopped by the idling-stop controller, a time differential value of an engine speed of the engine is constant.