Hybrid Vehicle Stop Charging Control Using Motor and HSG
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Solution Overview
Problem
In hybrid vehicles, low battery state of charge (SOC) often leads to frequent engine startups to charge the battery when stopped, causing customer inconvenience due to increased use of electrical components.
Innovation Solution
A control apparatus and method that selectively employs a first charging mode using the driving motor and a second charging mode using both the driving motor and hybrid starter-generator (HSG) to quickly charge the battery based on expected stop time and SOC, with the option to limit charging in idling restricted zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is turned on frequently to charge the battery when SOC is low and the vehicle is stopped, then the battery can be charged, but customer inconvenience increases due to frequent engine startups
Solution Approach 1:
The control apparatus performs preliminary charging action by turning on the engine before the vehicle is actually needed to move. The controller predicts the next vehicle operation time and charges the battery in advance during the stopped period, so that when the vehicle needs to move, the battery is already sufficiently charged and the engine can be turned off, avoiding frequent engine startups and improving customer convenience.
2Productivity
If the engine is kept running to charge the battery quickly, then charging speed increases, but fuel consumption increases
Solution Approach 1:
The control apparatus dynamically adjusts the engine operation state based on real-time conditions. The controller continuously monitors battery SOC, predicted vehicle operation time, and other parameters, and dynamically switches between charging mode (engine on) and idle mode (engine off). This dynamic control optimizes the balance between charging speed and fuel consumption by only running the engine when necessary and for the minimum required duration.
3Use of energy by moving object
If the vehicle operates in EV mode with low battery SOC, then electrical component usage is limited, but driving flexibility is reduced
Solution Approach 1:
The control apparatus performs preliminary charging action by turning on the engine before the vehicle is actually needed to move. The controller predicts the next vehicle operation time and charges the battery in advance during the stopped period, so that when the vehicle needs to move, the battery is already sufficiently charged and the engine can be turned off, avoiding frequent engine startups and improving customer convenience.
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
Enables quick and efficient battery charging while the vehicle is stopped, improving charging efficiency and reducing customer inconvenience by optimizing charging modes and adhering to idling restrictions.
Implementation Method 1
the driving motor may convert power outputted from the engine into electrical energy to charge the battery
Implementation Method 2
the driving motor and the HSG may convert power outputted from the engine into electrical energy to charge the battery
Implementation Method 3
an engine that generates power required for vehicle driving by fuel combustion
Data Source
AI summary
A control apparatus of a hybrid vehicle includes an input and output module for a driver to select a driving mode, an engine that generates power required for vehicle driving by fuel combustion, a driving motor that generates power required for vehicle driving and operates as a generator, a hybrid starter-generator (HSG) that starts the engine and operates as a generator, and a controller. When the driving mode is inputted to a stopping mode through the input and output module, based on an expected stop time, a current SOC of a battery, a target SOC of the battery, output of the driving motor, and output of the HSG, the controller that performs a first charging mode that charges the power generated by the engine in the battery through the driving motor and a second charging mode that charges the power generated by the engine in the battery through the driving motor and the HSG.