Adaptive Battery Estimator for Fast Dynamics
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Solution Overview
Problem
Existing methods for estimating battery dynamics primarily focus on 'slow' dynamics, such as state-of-charge, and are inadequate for capturing 'fast' dynamics like battery voltage and current fluctuations, which are crucial for accurate vehicle control systems.
Innovation Solution
An adaptive battery control system that estimates battery terminal voltage, internal resistance, and current using a plurality of sensors and a vehicle battery control module, incorporating both fixed and adaptive estimators to predict battery dynamics based on input signals and power requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing battery estimation methods focusing on slow dynamics (state-of-charge) are used, then the estimation method is simple, but the accuracy of capturing fast dynamics (voltage and current fluctuations) deteriorates
Solution Approach 1:
The battery dynamics estimation is segmented into two distinct components: slow dynamics (state-of-charge) and fast dynamics (voltage and current fluctuations). The patent applies different estimation methods to each segment - a simpler method for slow dynamics and a more sophisticated adaptive method for fast dynamics, thereby achieving high accuracy without uniformly increasing system complexity across all estimation functions.
Solution Approach 2:
The patent transitions from static estimation methods to dynamic estimation by implementing an adaptive estimator that continuously adjusts its parameters based on real-time battery conditions. The adaptive nature allows the system to capture fast-changing voltage and current dynamics while maintaining computational efficiency through on-the-fly parameter adaptation rather than fixed complex models.
2Adaptability or versatility
If a greater number of sensors are included to provide increased vehicle system control, then the vehicle system control capability is improved, but the burden on the electrical system increases
Solution Approach 1:
The adaptive battery estimator serves multiple functions simultaneously: it estimates state-of-charge, terminal voltage, internal resistance, and battery current from a single integrated system. This multi-functionality allows the patent to achieve enhanced vehicle system control capability without requiring separate dedicated sensors for each parameter, thereby reducing the overall electrical system burden.
Solution Approach 2:
The patent uses the battery terminal voltage as an intermediary measurement that contains information about multiple battery parameters. By analyzing voltage fluctuations in response to known load changes, the system can infer current, internal resistance, and state-of-charge without directly measuring each parameter separately, thus reducing sensor requirements while maintaining control versatility.
Data Source
AI summary
An adaptive battery estimation control system includes a fixed and adaptive battery estimators effective for a battery parameter estimations across a wide range of dynamic battery operational conditions.