Vehicle Controller Re-acceleration Engine Speed Control
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Solution Overview
Problem
Hybrid vehicles experience degraded acceleration response due to engine shutdown during deceleration, which is not adequately addressed by existing systems that rely solely on road type or driver input, as they fail to consider the dynamic driving conditions of preceding vehicles.
Innovation Solution
A vehicle controller system that includes a sensor to detect the driving condition of a preceding vehicle, a re-acceleration determiner to identify re-acceleration states, and a rotation controller to maintain engine rotational speed above a lower limit when re-acceleration is detected, thereby inhibiting engine shutdown and enhancing acceleration response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is shut down during vehicle deceleration to reduce fuel consumption, then fuel economy is improved, but acceleration response is degraded
Solution Approach 1:
The system performs preliminary action by detecting re-acceleration patterns of preceding vehicles before the current vehicle needs to accelerate. By identifying that a preceding vehicle has decelerated and then accelerated (re-acceleration state), the system proactively maintains engine rotational speed above the lower limit, so that when the current vehicle needs to accelerate, the engine is already in a state ready for quick response, thus resolving the contradiction between fuel savings from shutdown and acceleration response
2Speed
If the engine rotational speed is maintained above a lower limit during re-acceleration state, then acceleration response is improved, but fuel consumption increases
Solution Approach 1:
The system applies dynamics by making the engine rotational speed control adaptive rather than static. The rotation controller dynamically adjusts the engine speed maintenance strategy based on the detected re-acceleration state of preceding vehicles. The engine speed is maintained above the lower limit only when the re-acceleration state is detected, and allowed to decrease when it is not, thus optimizing the balance between acceleration response and fuel consumption under varying driving conditions
3Speed
If engine shutdown is inhibited only on expressway ramps, then acceleration response is improved on ramps, but the system cannot adapt to other driving conditions requiring good acceleration performance
Solution Approach 1:
The system implements feedback by using sensors to detect the driving conditions of preceding vehicles and using this information to dynamically adjust engine shutdown control. The re-acceleration determiner continuously monitors preceding vehicle behavior (deceleration followed by acceleration) and feeds this information back to the rotation controller, which adjusts engine speed maintenance accordingly. This feedback mechanism enables the system to adapt to various driving conditions beyond just expressway ramps, improving acceleration response whenever re-acceleration scenarios are detected
Data Source
AI summary
A vehicle controller includes a camera unit that detects driving conditions of a preceding vehicle; a re-acceleration determiner that determines based on the driving conditions of the preceding vehicle whether or not a re-acceleration state in which the preceding vehicle decelerates and then accelerates occurs; and a rotation controller that, if it is determined that the vehicle is in a re-acceleration state, maintains the engine speed of the engine not less than a lower limit.