Optimal control strategy for distributed low voltage system with unidirectional dc converter
By employing a unidirectional DC/DC converter and model predictive control in a distributed low-voltage system in electric and hybrid vehicles, current distribution is optimized, the problem of unbalanced state of charge in high-voltage battery modules is solved, and the power supply stability and efficiency of the low-voltage bus are improved.
CN118494377BActive Publication Date: 2026-07-24GM GLOBAL TECHNOLOGY OPERATIONS LLC
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Filing Date
- 2023-08-29
- Publication Date
- 2026-07-24
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Figure CN118494377B_ABST
Abstract
An optimal control strategy for a distributed low voltage system with unidirectional DC / DC converters for a vehicle system is presented. The DC / DC converters regulate high voltage from high voltage battery modules and output the regulated current to low voltage batteries. A control system differentially varies the current input to the DC / DC converters to balance state of charge in the high voltage battery modules by calculating sets of currents that balance state of charge in the high voltage battery modules based on a value of a low voltage regulator current before knowing the value of the low voltage regulator current, interpolating the sets of currents to be input to the DC / DC converters in response to receiving the value of the low voltage regulator current, and selecting an interpolated set of currents from the sets as input to the DC / DC converters according to the received value.
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