Vehicle Transmission Control for Traffic Light Stop Prediction
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Solution Overview
Problem
Conventional automatic transmission systems in vehicles often result in premature stopping due to engine back-driving during deceleration, leading to increased fuel loss from re-acceleration when attempting to maintain a desired stop position, especially when navigating through traffic lights or around preceding vehicles.
Innovation Solution
A vehicle control system that predicts stop positions based on traffic light states and vehicle infrastructure communication, determines optimal speed profiles, and adjusts transmission stages to decelerate the vehicle effectively without re-acceleration, using a determination device to decide between speed following and neutral driving controls based on traffic light states and distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional gear shifting schedule is used to maintain fuel cut-off state during deceleration, then fuel consumption is reduced during coasting, but vehicle stops at position earlier than expected due to engine back-driving, requiring re-acceleration and increasing overall fuel loss
Solution Approach 1:
The system predicts the stop position in advance by considering traffic light states and vehicle deceleration characteristics, then proactively adjusts transmission stages before the vehicle actually reaches the stop position. This preliminary action prevents premature stopping by preparing the transmission control ahead of time, allowing the vehicle to maintain momentum and reach the intended stop position without re-acceleration.
Solution Approach 2:
The transmission control system dynamically adjusts transmission stages based on real-time conditions including traffic light states, predicted stop position, and current vehicle speed. Instead of using a fixed gear shifting schedule, the system continuously adapts the transmission control strategy, switching between different transmission stages optimally timed to achieve the predicted stop position while maintaining fuel efficiency.
2Measurement precision
If transmission control is adjusted to prevent premature stopping, then stop position accuracy is improved, but transmission control complexity increases
Solution Approach 1:
The control system is divided into distinct functional modules: a traffic light state acquisition module that receives signal states, a stop position prediction module that calculates predicted stop positions based on vehicle characteristics and traffic conditions, and a transmission control module that executes stage adjustments. This segmentation allows each module to perform its specific function independently, managing overall system complexity while achieving accurate stop position prediction.
Solution Approach 2:
The system incorporates feedback mechanisms where the predicted stop position is continuously compared with actual vehicle position and traffic light states. This feedback loop allows the system to refine its predictions and adjust transmission control strategies in real-time, improving stop position accuracy while using systematic control logic that manages complexity through structured decision-making.
Data Source
AI summary
An apparatus and a method for controlling a transmission of a vehicle are provided. The apparatus includes a determination device to determine whether to perform speed following control based on state information of a traffic light positioned on a road in front of the vehicle in coasting, a stop position predicting device to predict a stop position of the vehicle based on position information of the vehicle and the traffic light, a transmission stage decision device to determine a target position and a target speed based on the predicted stop position and to form a speed profile for each transmission stage to determine a final transmission stage based on the target position and the target speed, and a controller to perform speed following transmission control based on the final transmission stage.