ISG Control Unit Adaptive Stoppage Delay Logic
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Solution Overview
Problem
Existing idle stop & go (ISG) systems degrade driving convenience and increase fuel consumption by unnecessarily turning off the engine during temporary vehicle stops and causing engine hesitation upon restart, as they apply the same stoppage delay time regardless of driving patterns.
Innovation Solution
An enhanced ISG system with a control unit that determines whether preset idle stop and restart conditions are met, accumulates data on non-satisfied conditions and short idle stops, and deactivates ISG operation when specific criteria are met, reactivating it based on travel distance and time, to prevent unintended ISG operations and reduce restart hesitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the ISG system applies a fixed stoppage delay time for engine shutdown, then fuel efficiency is improved through automatic engine shutdown during idle states, but driving convenience is degraded when the vehicle needs to be restarted immediately after temporary stops
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed stoppage delay time to a variable stoppage delay time that adapts to different driving conditions. The control unit dynamically adjusts the stoppage delay time based on detected driving patterns, such as distinguishing between temporary stops (parking lot maneuvers, traffic signals) and extended idle states, thereby resolving the contradiction between fuel efficiency and driving convenience
Solution Approach 2:
The patent changes the parameter of stoppage delay time from a static value to a dynamic parameter that varies based on driving conditions. By modifying this key parameter according to detected patterns (e.g., vehicle movement, brake status, duration), the system optimizes both fuel consumption and driving convenience without requiring manual driver intervention
2Loss of energy
If the ISG system performs engine shutdown during temporary stops, then fuel efficiency is improved, but engine restart hesitation is caused when the vehicle needs to be restarted immediately
Solution Approach 1:
The patent applies preliminary action by having the control unit detect and accumulate data on stoppage conditions before executing engine shutdown. It monitors parameters such as stoppage duration, vehicle movement, and brake status in advance, and only initiates shutdown when conditions confirm it's appropriate, preventing premature or unsuitable shutdowns that would cause restart hesitation
Solution Approach 2:
The patent implements feedback by continuously monitoring driving conditions and using this information to adjust ISG operations. The control unit accumulates data on stoppage patterns and uses this feedback to determine whether engine shutdown is appropriate, thereby preventing shutdowns that would lead to immediate restart hesitation and improving overall system reliability
3Device complexity
If the ISG system uses a fixed stoppage delay time, then the control logic is simple, but it cannot distinguish between temporary stops and extended idle states leading to unnecessary engine shutdowns
Solution Approach 1:
The patent applies segmentation by dividing the stoppage detection function into multiple sub-functions within the control unit. It segments the monitoring process into detecting stoppage conditions, accumulating stoppage data, determining stoppage patterns, and deciding on engine shutdown based on accumulated evidence. This segmentation manages complexity while improving accuracy in distinguishing temporary stops from extended idle states
Data Source
AI summary
The ISG (Idle Stop & Go) system may include a vehicle information receiving unit receiving a vehicle information, and a control unit including an ISG operation logic which performs an idle stop when a preset idle stop condition is satisfied and restarts the engine when a preset restart condition of the engine is satisfied, and an ISG deactivation determination logic which determines whether a preset ISG deactivation condition is satisfied or not, based on the accumulated number of determinations that the idle stop condition is not satisfied, the accumulated number of idle stops, and the accumulated number of determinations that a performance time of the idle stop is smaller than a preset idle stop retention time, and deactivates the ISG operation logic when the ISG deactivation condition is satisfied.