Dynamic Battery Charging Threshold for Idling Stop Control
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Solution Overview
Problem
The existing methods for implementing idling stop in internal combustion engines restrict the frequency of idling stop when the battery temperature is low, leading to reduced fuel efficiency and increased battery deterioration, as they prohibit idling stop based on a fixed battery charging rate threshold that does not account for varying temperatures.
Innovation Solution
A control device for internal combustion engines that sets a lower threshold for battery charging rate permission and prohibition based on temperature, allowing idling stop execution even at low temperatures, thereby increasing the opportunity for idling stop and reducing battery deterioration by dynamically adjusting the thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed battery charging rate threshold is used to prohibit idling stop, then battery protection is improved, but fuel efficiency deteriorates due to reduced idling stop opportunities at low temperatures
Solution Approach 1:
The patent applies dynamics by making the battery charging rate threshold dynamic rather than fixed. The threshold is adjusted based on battery temperature conditions: a first (lower) threshold is applied when battery temperature is below a reference temperature, and a second (higher) threshold is applied when battery temperature is at or above the reference temperature. This dynamic adjustment allows the system to optimize both battery protection and fuel efficiency by adapting the threshold to operating conditions.
Solution Approach 2:
The patent changes the parameter of the battery charging rate threshold based on battery temperature. By setting different threshold values for different temperature ranges, the system enables idling stop at low temperatures when the battery can tolerate lower charging rates, while maintaining higher thresholds at high temperatures for enhanced battery protection. This parameter change resolves the contradiction by allowing flexible optimization.
2Duration of action of stationary object
If a high battery charging rate threshold is maintained to protect the battery, then battery durability is improved, but the opportunity to execute idling stop is reduced
Solution Approach 1:
The system dynamically adjusts the battery charging rate threshold based on battery temperature, enabling high idling stop execution frequency at low temperatures while maintaining battery durability through higher thresholds at high temperatures. This dynamic behavior allows the system to maximize productivity when conditions permit and protect battery durability when needed.
Solution Approach 2:
The patent applies local quality by setting different threshold requirements for different temperature conditions. Instead of applying a uniform high threshold across all operating conditions, the system applies a lower threshold locally at low temperatures where battery deterioration is slower, and a higher threshold locally at high temperatures where battery protection is more critical. This localized approach balances durability and productivity.
3Device complexity
If a single threshold value is used for all temperature conditions, then control device structure is simplified, but fuel efficiency cannot be optimized at low temperatures
Solution Approach 1:
The patent implements a dynamic threshold system that adjusts the battery charging rate threshold based on battery temperature. This dynamic approach optimizes fuel efficiency at low temperatures by allowing lower thresholds, while maintaining simplified control logic through clear temperature-based conditional statements. The system achieves optimization without excessive complexity.
Solution Approach 2:
The system changes the threshold parameter based on temperature conditions, enabling fuel efficiency optimization at low temperatures. The control device structure remains relatively simple by using straightforward temperature comparison and conditional threshold selection, avoiding complex algorithms while still achieving parameter adaptation for optimization.
4Use of energy by moving object
If the battery charging rate threshold is lowered to increase idling stop opportunities, then fuel efficiency is improved, but battery over-discharge risk increases
Solution Approach 1:
The patent dynamically adjusts the battery charging rate threshold based on battery temperature to balance fuel efficiency and battery protection. At low temperatures where battery chemistry is more tolerant of discharge, a lower threshold enables frequent idling stop for fuel efficiency. At high temperatures where battery stress is higher, a higher threshold prevents over-discharge risk. This dynamic adjustment resolves the contradiction by adapting to operating conditions.
Solution Approach 2:
The system changes the threshold parameter according to temperature conditions, allowing lower thresholds at low temperatures to improve fuel efficiency while maintaining higher thresholds at high temperatures to prevent battery over-discharge. This parameter adaptation based on environmental conditions resolves the contradiction between fuel efficiency and battery protection.
Data Source
AI summary
A control device for an internal combustion engine for executing idling stop. The control device includes a threshold setting unit and an execution prohibition unit. The threshold unit sets a threshold of a charging rate of a battery and sets the threshold when the battery temperature is low smaller than that when the battery temperature is high. The threshold is used for determining whether execution of the idling stop is permitted. The execution prohibition unit prohibits execution of the idling stop when the charging rate of the battery is less than the threshold. The threshold is set by the threshold setting unit.