Vehicle Control Device for Noise and Fuel Efficiency Trade-off
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Solution Overview
Problem
Existing vehicle control systems that adjust engine rotation speed via stepless gear shifting mechanisms face challenges in balancing noise reduction and fuel efficiency, as they often compromise fuel efficiency when curbing noise generation.
Innovation Solution
A control device that predicts noise generation duration time and adjusts the engine operating point to remain on the optimal fuel-efficiency line when duration is short, and shifts outside this line when duration is long to minimize noise, using a prediction unit and control unit to manage the engine and gear shifting mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the engine operating point is controlled to reach an operating point outside of the optimal fuel-efficiency operating line to curb noise generation, then noise generation is reduced, but fuel efficiency decreases
Solution Approach 1:
The prediction unit predicts the noise generation duration time before the engine operating point actually enters the noise generation region. Based on this prediction, the control unit proactively adjusts the engine operating point to remain on the optimal fuel-efficiency operating line when the predicted duration is short, or moves outside it when the predicted duration is long, thereby preventing noise generation while minimizing fuel efficiency loss.
Solution Approach 2:
The control system dynamically adjusts the engine operating point based on real-time prediction of noise generation duration. The control unit switches between two control strategies (staying on the optimal fuel-efficiency operating line vs. moving outside it) depending on the predicted noise duration, making the system adaptive to changing operating conditions.
2Use of energy by moving object
If the engine operating point remains on the optimal fuel-efficiency operating line, then fuel efficiency is maintained, but noise generation increases when the operating point enters the noise generation region
Solution Approach 1:
The control system uses feedback from the prediction unit to continuously monitor and adjust the engine operating point. The prediction unit provides real-time information about the predicted noise generation duration, and the control unit uses this feedback to decide whether to keep the engine on the optimal fuel-efficiency operating line or move outside it to avoid noise generation.
Data Source
AI summary
When a noise generation duration time predicted by a prediction unit is equal to or less than a predetermined time and it is predicted that generation of noise can be further curbed in comparison with a case in which the noise generation duration time in which noise is generated is relatively short and the noise generation duration time is greater than the predetermined time, an engine operating point control unit controls an engine and a differential unit such that an engine operating point reaches an engine operating point in an optimal fuel-efficiency operating line and thus it is possible to curb generation of noise and to curb a decrease in fuel efficiency.