Vehicle Control Unit Engine Speed Variation During Lane Changes
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Solution Overview
Problem
Existing vehicle control systems face issues with engine speed variation during acceleration control, leading to poor driver performance and discomfort due to sudden changes in engine speed, especially during lane changes and deceleration possibilities.
Innovation Solution
A vehicle control unit that determines acceleration and deceleration possibilities using surrounding vehicle and road information, adjusting the target engine speed and gear ratio to maintain efficient engine operation and reduce engine speed variation, thereby improving fuel efficiency and driver comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If gear ratio is controlled to drive the engine in an optimal fuel consumption region, then fuel efficiency is improved, but engine speed variation increases causing poor driver performance
Solution Approach 1:
The system determines acceleration and deceleration possibilities in advance using surrounding vehicle and road information. When deceleration is predicted, the engine speed target is adjusted before the actual deceleration occurs, preventing sudden engine speed drops and maintaining smooth operation during lane changes or intersections.
Solution Approach 2:
The engine speed target is made dynamic based on predicted driving conditions. The system adjusts the target engine speed according to acceleration/deceleration possibilities, allowing the engine to operate efficiently while adapting to changing conditions, thus avoiding large speed variations that would affect driver performance.
2Adaptability or versatility
If acceleration control is interrupted due to lane change, then the vehicle can change lanes, but engine speed drops from high to low causing variation and poor driver performance
Solution Approach 1:
The system detects lane change possibilities in advance using surrounding vehicle information and determines acceleration/deceleration possibilities accordingly. By adjusting the engine speed target before the lane change occurs, the system prevents sudden engine speed drops and maintains smooth operation during the maneuver.
3Reliability
If suppressed acceleration is applied when lane change possibility exists, then safety is improved, but driver feels discomfort
Solution Approach 1:
The system dynamically adjusts acceleration control based on predicted deceleration possibilities. When a lane change is predicted, the engine speed target is adjusted to maintain smooth acceleration, avoiding sudden changes that would cause driver discomfort while still ensuring safe operation.
Data Source
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AI summary
When acceleration control is interrupted due to a lane change or the like, the engine speed is controlled from a high rotation speed to a low rotation speed, a variation in engine speed increases, and poor driver's driving performance is brought about. Furthermore, suppression of acceleration when there is a lane change possibility may rather cause the lane change and the driver feels discomfort. The vehicle control unit according to the present invention includes a target engine speed calculation unit which corrects a target engine speed to be reduced relative to a predetermined target engine speed when the acceleration/deceleration possibility determination unit determines that there is a deceleration possibility during acceleration to a target vehicle speed in automatic acceleration/deceleration control, and an engine control unit which controls an engine to have a target engine speed corrected by the target engine speed calculation unit.