Vehicle Controller Dynamic State of Charge Threshold for Warm-Up PM Reduction
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Solution Overview
Problem
During the warm-up period of an internal combustion engine in vehicles equipped with both an internal combustion engine and a motor generator, the increased ratio of engine output to vehicle required output leads to higher particulate matter discharge due to insufficient battery power supply, which is exacerbated by low battery temperatures.
Innovation Solution
A controller adjusts the state of charge threshold for the battery based on temperature, setting a lower threshold during the warm-up period and a higher threshold after warm-up is complete, to limit the execution of charging control and thereby reduce particulate matter discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If charging control is executed during the warm-up period to charge the battery, then the state of charge of the battery is improved, but the amount of particulate matter discharged from the internal combustion engine increases
Solution Approach 1:
The state of charge threshold is made dynamic rather than fixed. The control device adjusts the threshold based on whether the internal combustion engine is in the warm-up period or not. During warm-up, a first (lower) threshold is used; after warm-up, a second (higher) threshold is used. This dynamic adjustment allows charging control to be selectively applied, preventing PM increase during warm-up while enabling battery charging after warm-up completes.
Solution Approach 2:
The invention changes the parameter of the state of charge threshold based on engine operating conditions. By monitoring engine temperature and warm-up status, the system switches between different threshold values (first threshold during warm-up, second threshold after warm-up). This parameter change strategy resolves the contradiction by adapting the charging control criteria to the engine's thermal state, thereby reducing PM discharge during critical warm-up periods.
2Use of energy by moving object
If the ratio of internal combustion engine output to vehicle required output is increased to generate power for the battery, then the battery charging capability is improved, but the amount of particulate matter discharged from the internal combustion engine increases
Solution Approach 1:
The system performs preliminary assessment of engine warm-up status before initiating charging control. By detecting whether the engine has completed warm-up (monitoring engine temperature and operational state), the control device prevents charging control activation during the warm-up period. This preliminary action avoids the harmful effect of increased PM discharge that would result from running the engine at high output ratios during warm-up.
Solution Approach 2:
The control device continuously monitors engine operating parameters including temperature, rotational speed, and load to determine warm-up status. This feedback mechanism allows the system to adaptively adjust charging control decisions based on real-time engine state, ensuring that charging operations are postponed until the engine is fully warmed up, thereby preventing PM increase while maintaining battery charging capability.
Data Source
AI summary
A controller for a vehicle is configured to execute, when a state of charge of a battery is less than or equal to a threshold, a charging control to charge the battery with power that is generated by a motor generator using driving force of an internal combustion engine. The controller is also configured to obtain a temperature of the battery, set the threshold to a first threshold during a warm-up period, which is a period from a start of the internal combustion engine until the warm-up of the internal combustion engine is completed, set the threshold to a second threshold, which is greater than the first threshold, when the warm-up period ends, and set the second threshold to be greater when the temperature of the battery is a first temperature than when the temperature of the battery is a second temperature, which is higher than the first temperature.