EV Charging Control for Accessory Loads and Battery Power Limits
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Solution Overview
Problem
Existing electric vehicle charging systems do not effectively account for parasitic loads during charging, leading to suboptimal battery charging and increased fuel consumption due to limited power distribution.
Innovation Solution
A hybrid control circuit that determines a total power limit by summing battery power limits and parasitic power loads, broadcasting this limit to the charging source to ensure the battery receives maximum power while satisfying accessory loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery management system broadcasts a current or power limit to the charging source during a normal recharge cycle, then the battery charging safety is ensured, but the charging speed and power utilization are limited
Solution Approach 1:
The patent segments the power limit into two components: a battery power limit (determined by the battery management system based on battery state of charge, temperature, and health) and an accessory power limit (determined by the hybrid control circuit based on parasitic loads). This segmentation allows the charging source to provide higher total power while the battery management system ensures battery safety through its power limit, resolving the contradiction between safety and charging speed.
Solution Approach 2:
The hybrid control circuit acts as an intermediary between the battery management system and the charging source. It receives the battery power limit from the battery management system, adds the accessory power limit, and broadcasts the total power limit to the charging source. This intermediary enables faster charging by incorporating accessory power needs while maintaining battery safety through the original battery power limit.
2Productivity
If the battery receives maximum power during charging, then the charging efficiency is improved, but the parasitic accessory loads may not be satisfied
Solution Approach 1:
The patent merges the battery power limit and accessory power limit into a single total power limit that is broadcast to the charging source. This combination allows the charging source to provide sufficient power for both battery charging and accessory loads simultaneously, resolving the contradiction between maximizing battery charging efficiency and satisfying parasitic accessory loads.
Solution Approach 2:
The hybrid control circuit performs preliminary calculation of the total power limit by adding the battery power limit and accessory power limit before the charging process begins. This preliminary action ensures that the charging source is informed of the total power requirements in advance, allowing both battery charging and accessory loads to be satisfied without conflict during the charging process.
3Length of moving object
If the charging source provides high power to the battery, then the charge range is extended, but the charging station capacity utilization is suboptimal
Solution Approach 1:
The patent makes the charging station capacity serve multiple functions simultaneously: charging the battery and powering accessory loads. By broadcasting a total power limit that includes both battery and accessory power needs, the system ensures that charging station capacity is fully utilized for dual purposes, resolving the contradiction between extending charge range and optimizing charging station capacity utilization.
Data Source
AI summary
Systems and methods to control an electric vehicle accessory of an electric vehicle during a charge event are provided. An apparatus includes a controller communicatively coupled to a battery and an electric vehicle accessory. The controller is structured to: receive a battery power limit from the battery management system; receive an indication that the battery is undergoing the charge event; and cause the electric vehicle accessory to recharge by absorbing energy from a charging station during the charge event.