Automatic Stop-Start Function Calibration During Battery Reconnection
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Solution Overview
Problem
The automatic stop and restart function for internal combustion engines is inhibited for several hours after battery disconnection and reconnection, as the battery state of charge estimator requires a long standby period to recalibrate, leading to vehicle immobilization and delayed functionality.
Innovation Solution
A method that detects the occurrence of battery disconnection and reconnection, followed by activation of the automatic stop and restart function during maintenance or repair modes, independent of battery state of charge, and ensures reliability through convergence threshold or waiting time checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery state of charge estimator is used to ensure accurate state of charge estimation, then the reliability of the automatic stop and restart function is improved, but the vehicle must be immobilized for several hours after battery disconnection and reconnection
Solution Approach 1:
The system performs preliminary calibration of the state of charge estimator during a standby phase before the automatic stop and restart function is activated. This preliminary action ensures that when the battery is reconnected, the estimator has already been calibrated and is ready for immediate use, eliminating the need for post-reconnection waiting period.
Solution Approach 2:
The system dynamically adjusts the activation conditions of the automatic stop and restart function based on the calibration status of the state of charge estimator. When calibration is complete, the function can be activated immediately; when calibration is pending, the system manages the function accordingly, creating a dynamic response to the calibration state.
2Productivity
If the automatic stop and restart function is activated immediately after battery reconnection, then the productivity is improved, but the accuracy of state of charge estimation deteriorates
Solution Approach 1:
The system performs preliminary calibration of the state of charge estimator during a standby phase before the automatic stop and restart function is activated. This preliminary action ensures that when the battery is reconnected, the estimator has already been calibrated and is ready for immediate use, eliminating the need for post-reconnection waiting period.
3Ease of repair
If the battery is disconnected for maintenance or repair, then the ease of repair is improved, but the automatic stop and restart function becomes unavailable
Solution Approach 1:
The system performs preliminary calibration of the state of charge estimator during a standby phase before the automatic stop and restart function is activated. This preliminary action ensures that when the battery is reconnected, the estimator has already been calibrated and is ready for immediate use, eliminating the need for post-reconnection waiting period.
Data Source
Figure 1
AI summary
The invention relates to a method for managing an automatic stop-start function of a vehicle's internal combustion engine, which also includes a battery. This method comprises a step (01) of detecting when the battery is disconnected and then reconnected. The method is characterized in that it is followed by the steps (02) of detecting when a vehicle maintenance or repair operating mode is activated and, when such an occurrence is detected, activating (05) the automatic stop-start function, without taking into account the battery's state of charge. The invention also relates to a vehicle whose computer includes instructions for executing the method of the invention. The invention makes it possible to test the automatic stop-start function immediately after a maintenance operation without having to wait for the battery's state of charge to be estimated.