Vehicle Idle Stop Control via Disk Temperature Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing idle stop and go (ISG) system in vehicles often causes braking noise and startup delay due to the electric stability control system's delayed engine restart, which can lead to momentary vibrations and increased noise when the disk temperature is high during sequential or quick braking.
Innovation Solution
A method and system that estimate the disk temperature based on work done by the braking force, prohibiting engine stop during idle stop if the disk temperature exceeds a predetermined threshold to prevent braking noise, and controlling the electric brake system to manage engine restart and stop conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the electric stability control system delays engine restart to prevent stumble, then engine stability is improved, but braking noise increases and vehicle startup is delayed
Solution Approach 1:
The system changes the engine restart timing parameter based on disk temperature conditions. When disk temperature is high, the engine restart is delayed longer to avoid braking noise; when disk temperature is low, the engine restart occurs sooner to reduce startup delay. This dynamic parameter adjustment resolves the contradiction between engine stability and braking noise.
Solution Approach 2:
The system dynamically adjusts the engine restart timing based on real-time disk temperature monitoring. The restart delay duration is not fixed but varies according to thermal conditions, allowing the system to adapt between preventing stumble (requiring delay) and reducing braking noise (avoiding delay when disk is hot).
2Object-generated harmful factors
If the electric stability control system extends braking time to prevent noise, then braking noise is reduced, but vehicle startup is excessively delayed
Solution Approach 1:
The system uses disk temperature as a parameter to determine the appropriate engine restart timing. When disk temperature is low, earlier restart is permitted to reduce startup delay; when disk temperature is high, later restart is enforced to prevent braking noise. This parameter-based decision-making resolves the time trade-off.
Solution Approach 2:
The system implements feedback control by monitoring disk temperature and adjusting engine restart timing accordingly. The temperature feedback allows the system to automatically determine whether to prioritize noise reduction or startup speed, eliminating the need for manual intervention or fixed timing rules.
3Force
If sequential braking or quick braking is performed before vehicle stop, then braking effectiveness is improved, but disk temperature increases causing increased braking noise
Solution Approach 1:
The system performs preliminary monitoring of disk temperature through work-based estimation before the vehicle stop occurs. By calculating the work done by braking force and converting it to temperature rise, the system predicts disk temperature in advance, allowing proactive adjustment of engine restart timing to prevent braking noise before it occurs.
Solution Approach 2:
The system replaces direct disk temperature measurement with a mechanical work-based estimation method. By calculating work done by braking force and converting to thermal energy, the system infers temperature without physical sensors, enabling temperature-aware control based on braking history and intensity.
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
Prevents braking noise and reduces startup delay by ensuring the engine does not stop when the disk temperature is high, thereby maintaining optimal braking conditions and reducing noise, while allowing engine stop when safe to do so, thus enhancing vehicle performance and reducing noise pollution.
Implementation Method 1
the braking noise further increases if a disk temperature is raised by sequential braking before the vehicle stops or by quick braking
Data Source
AI summary
A method and a system for controlling idle stop of a vehicle that can reduce braking noise and prevent startup delay may be included, wherein the method for controlling may include estimating a disk temperature, determining whether the estimated disk temperature may be lower than or equal to a first predetermined temperature, and prohibiting engine stop according to the idle stop when the estimated disk temperature may be higher than the first predetermined temperature.