Deceleration Control for Hybrid Vehicles Using Traffic Light Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid vehicles face inefficiencies in deceleration control, leading to unnecessary acceleration and deceleration, which affects fuel efficiency, especially when approaching traffic lights, due to lack of precise speed profiling based on traffic light information and vehicle positioning.
Innovation Solution
A method and device for controlling deceleration in environmentally friendly vehicles that determine a speed profile by calculating the actual deceleration driving distance and time using traffic light information and vehicle positioning, optimizing motor torque and gear ratio to maximize regenerative energy and prevent excessive acceleration and deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the vehicle performs deceleration control without considering waiting vehicles and traffic light information, then the control system is simple, but the fuel efficiency deteriorates due to unnecessary acceleration and deceleration
Solution Approach 1:
The control device receives traffic light information in advance and determines a speed profile before reaching the traffic light. By calculating the required deceleration distance and comparing it with the actual distance to the traffic light, the system proactively plans the deceleration maneuver, avoiding last-minute braking and subsequent unnecessary acceleration, thereby improving fuel efficiency.
Solution Approach 2:
The control device continuously monitors the vehicle's current speed, position, and compares it with the pre-determined speed profile. Based on this feedback, the system adjusts the actual deceleration control commands to match the planned profile, ensuring optimal fuel efficiency while adapting to real-time vehicle conditions.
2Use of energy by moving object
If the vehicle determines speed profile based on traffic light information and waiting vehicles, then fuel efficiency improves, but the information processing complexity increases
Solution Approach 1:
The control device extracts only the essential information needed for deceleration control from the traffic light information, specifically the distance to the traffic light and the status of waiting vehicles. By filtering out unnecessary information and focusing only on critical parameters, the system improves fuel efficiency without being overwhelmed by excessive information processing complexity.
3Measurement precision
If the vehicle calculates actual deceleration distance considering waiting vehicles, then deceleration precision improves, but the calculation complexity increases
Solution Approach 1:
The control device calculates the required deceleration distance in advance based on the speed profile and compares it with the actual distance to the traffic light. By performing this calculation beforehand rather than in real-time during deceleration, the system achieves precise deceleration control while keeping the computational complexity manageable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate deceleration control, improving fuel efficiency by minimizing unnecessary acceleration and deceleration, and maximizing regenerative energy capture, thus enhancing the overall performance of environmentally friendly vehicles.
Implementation Method 1
a regenerative braking mode in which braking and inertial energy is recovered through power generation of the motor and charged to the battery
Data Source
AI summary
A method for controlling deceleration of a vehicle includes determining, by a controller, a reference deceleration driving distance of the vehicle based on current speed information of the vehicle and stop signal residual time information of a traffic light located ahead of the vehicle, determining, by the controller, whether the reference deceleration driving distance is less than or equal to a distance between the vehicle and the traffic light, and determining, by the controller, a speed profile including an actual deceleration driving distance of the vehicle based on a waiting distance of a waiting vehicle that waits before the traffic light when it is determined that the reference deceleration driving distance is less than or equal to the distance between the vehicle and the traffic light.