On-board Power Control Apparatus Priority Duty Ratio
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Solution Overview
Problem
Existing on-board power control systems fail to effectively suppress power consumption based on the current or future state of a battery, leading to uniform power reduction across all loads without considering their importance, and do not accurately measure or predict the battery state, risking inappropriate control.
Innovation Solution
An on-board power control apparatus that includes a power control unit with a determination unit to assess the battery's output voltage and SOC, a duty ratio setting unit to adjust power supply to switch units, and a priority level setting unit to prioritize power supply based on temperature and load states, allowing for targeted reduction of power to non-essential loads when the battery state is critical.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If uniform PWM control is applied to all loads to suppress power consumption, then overall power consumption is reduced, but power supply to high-priority loads is unnecessarily reduced
Solution Approach 1:
The patent applies different duty ratios to different loads based on their priority levels. High-priority loads receive higher duty ratios (more power) while low-priority loads receive lower duty ratios (less power), creating local quality differences in power distribution rather than uniform control across all loads.
Solution Approach 2:
The patent segments the power supply system into multiple independent control channels, each with its own duty ratio setting based on load priority. This allows independent optimization of power distribution to different load groups, separating the control of high-priority and low-priority loads.
2Loss of energy
If power supply is reduced to suppress power consumption, then energy loss is decreased, but battery state measurement and prediction accuracy must be maintained
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors battery state (charge level, temperature, voltage) and adjusts duty ratios accordingly. The system predicts future battery states and modifies power distribution in real-time based on this feedback, ensuring measurement accuracy is maintained while optimizing energy management.
3Reliability
If priority-based power distribution is implemented, then power supply reliability for essential loads is improved, but system complexity increases
Solution Approach 1:
The patent changes the control parameter from uniform duty ratio to priority-based differential duty ratios. By introducing priority levels as a new parameter, the system can differentiate power distribution without requiring complex structural modifications, simply adjusting the duty ratio parameter for each load based on its priority classification.
Data Source
AI summary
The present disclosure provides a configuration that can determine whether to suppress the power consumption of a load based on the state of a battery, and reduce the duty ratio to be supplied to a switch unit that is provided on a power supply path to the load, when the power consumption is to be suppressed. In an on-board power control apparatus, when a determination unit determines that a prediction value of an output voltage of a battery is less than a threshold voltage value, a duty ratio setting unit selects at least one of the plurality of loads as a target load for which power supply is to be stopped or suppressed, and the duty ratio setting unit resets duty ratios to reduce a duty ratio of a control signal to be output to a switch unit provided on a power supply path to the selected target load.