Hybrid Drive Control for Predictive Battery Preconditioning
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Solution Overview
Problem
Existing hybrid drive systems face challenges in efficiently and cost-effectively activating the electric drive component to meet rapid power requirements without compromising the energy source's durability, as they often require high component costs and rapid response dynamics.
Innovation Solution
A method for controlling hybrid drives that detects upcoming traffic and road situations to predict power requests, increases the extraction rate from the electrical energy source before the power request, allowing for a gradual and non-discontinuous power increase, thus reducing wear on components and avoiding sudden power interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electric drive component is configured with high response dynamics to meet rapid power requests, then the power delivery speed is improved, but the component costs increase
Solution Approach 1:
The system performs preliminary actions by detecting upcoming traffic and road situations to predict future power requests. It then proactively increases the extraction rate from the electrical energy source before the actual power request occurs, allowing standard batteries to meet acceleration demands without requiring high response dynamics configuration
Solution Approach 2:
The power delivery process is segmented into two phases: a preparatory phase where the extraction rate is gradually increased before the power request, and an execution phase where the predicted power request is implemented. This segmentation allows the use of standard batteries by separating the rate-limiting preparation step from the power delivery step
2Power
If the extraction rate from the electrical energy source is increased rapidly to meet power requests, then the power delivery is improved, but the wear on the energy source increases
Solution Approach 1:
The system gradually increases the extraction rate from the electrical energy source in advance of the predicted power request. This preliminary gradual increase reduces mechanical and chemical stress on the battery, extending its service life while still enabling rapid power delivery when needed
Solution Approach 2:
The system cushions the electrical energy source against sudden high-rate discharge by pre-conditioning it with a gradual extraction rate increase. This beforehand cushioning protects the battery from harmful sudden loads while maintaining the capability to deliver high power when required
3Loss of time
If the electric drive component is activated predicatively based on route timetable, then the power request anticipation is improved, but the response dynamics requirements increase
Solution Approach 1:
The system uses traffic and road situation detection to predict power requests at upcoming points on the route. It then performs preliminary action by increasing the extraction rate before these predicted requests, eliminating the need for rapid response dynamics while maintaining low loss of time
Solution Approach 2:
The system dynamically adjusts the extraction rate based on predicted power requests from traffic and road situation analysis. This dynamic adjustment allows the use of standard batteries with moderate response dynamics by matching the extraction rate increase to the predicted timing and magnitude of power requests
Data Source
AI summary
A method for controlling a hybrid drive of a vehicle includes detecting a traffic and/or street situation ahead of the vehicle, and based on the detected situation, determining an upcoming increase of a performance requirement to be expected from the hybrid drive and increasing a withdrawal rate of an electrical energy source of the hybrid drive. This increase occurs before the performance requirement is realized. The performance requirement may be realized according to the increase of the withdrawal rate, e.g., in conformity with a performance requirement which may be entered via an interface, for example an accelerator pedal.