Hybrid Vehicle Battery Controller for Saturation Prevention
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Solution Overview
Problem
Hybrid vehicles face challenges in preventing battery saturation during power regeneration on long downgrade roads, leading to inefficient fuel consumption and power utilization.
Innovation Solution
A controller system that predicts battery state of charge (SOC) based on road grade and vehicle speed, executes discharge increasing control to prevent saturation, and corrects the control when actual and predicted SOC behaviors diverge, ensuring effective power regeneration and improved fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discharge increasing control is executed based on predicted SOC to prevent battery saturation, then battery saturation is prevented, but SOC control accuracy deteriorates when predicted SOC behavior shifts from actual SOC behavior
Solution Approach 1:
The system continuously monitors actual SOC and compares it with predicted SOC. When a deviation exceeds a threshold, the system feeds back this information to recalculate and update the discharge increasing control strategy, ensuring accurate SOC control even when initial predictions are inaccurate
Solution Approach 2:
The system performs preliminary SOC prediction based on road grade and vehicle speed before executing discharge increasing control. This preliminary action allows the system to proactively adjust discharge quantity to prevent battery saturation while maintaining control accuracy through subsequent feedback corrections
2Use of energy by moving object
If discharge increasing control is executed based on predicted SOC, then fuel consumption is improved through effective power regeneration, but control reliability deteriorates when SOC shift factors occur
Solution Approach 1:
The system uses feedback mechanisms to detect SOC shift factors such as changes in driver behavior, vehicle load, or road conditions. When such factors are detected, the system recalculates the discharge increasing control strategy to maintain reliability while continuing to improve fuel consumption through effective power regeneration
Solution Approach 2:
The system dynamically adjusts discharge control parameters based on detected SOC shift factors. By changing control parameters in response to actual operating conditions, the system maintains both control reliability and fuel efficiency under varying driving scenarios
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 system effectively prevents battery saturation, optimizes power regeneration, and enhances fuel consumption by dynamically adjusting discharge control based on accurate SOC predictions and corrections.
Implementation Method 1
a battery that transfer power with the motor generator... a regeneration power that is a power regenerated by the motor generator when the vehicle is decelerated
Data Source
AI summary
A controller is applied to a vehicle including an engine (11) and a motor generator (12 and 13) as power sources of the vehicle and a battery (20) that transfers power with the motor generator. The controller charges the battery with a regeneration power that is a power regenerated by the motor generator when the vehicle is decelerated. The controller includes a SOC prediction unit (39, 50 and 205) to predict a SOC indicating a remaining capacity of the battery in a scheduled travel route of the vehicle, based on a predicted result of a road grade and a vehicle speed in the scheduled travel route, a discharge control unit (39, 52, 206, 208 and 301 to 303) to execute a discharge increasing control to previously increase a discharge quantity of the battery to prevent the battery from becoming in a saturation state based on a predicted SOC that is the SOC predicted by the SOC prediction unit, when the discharge control unit determines that the battery becomes in the saturation state where the battery cannot be charged with the regeneration power based on the predicted SOC, a determination unit (39 and 105 to 109) to determine whether a behavior of the predicted SOC shifts from a behavior of an actual SOC or determine whether a SOC shift factor occurs, after a start of the discharge increasing control, where the SOC shift factor is a vehicle control or an environment change that predicts the behavior of the predicted SOC shifts from the behavior of the actual SOC, and a correction unit (39, 110, 201 to 209 and 301 to 303) to correct the discharge increasing control by executing a prediction of the SOC in the scheduled travel route again, when the determination unit determines that the behavior of the predicted SOC shifts from the behavior of the actual SOC or determines that the SOC shift factor occurs.