EV Acceleration Control Using Battery Degradation Feedback

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Solution Overview

Problem

Conventional techniques for controlling acceleration in electric vehicles prioritize acceleration performance over battery degradation, leading to increased battery degradation due to high current discharge, especially when the vehicle is heavy or on steep gradients.

Innovation Solution

An information processing method that calculates the degradation degree of the battery based on the output current during acceleration requests and generates acceleration control instructions to reduce battery degradation by adjusting acceleration time and target speed, prioritizing battery health over performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If acceleration control is optimized for performance (heavy vehicle compensation), then acceleration performance is improved, but battery degradation progresses

Engineering Contradiction:

Improveacceleration performanceVSAvoidbattery degradation

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent changes the control parameters from fixed acceleration targets to dynamic acceleration profiles that adapt based on battery state. The ECU calculates time-varying acceleration commands that reduce peak current demands, thereby changing the operational parameters to balance performance and battery health

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic adaptation where the acceleration control strategy changes in real-time based on battery state of charge and degradation indicators. The system transitions from static performance-oriented control to dynamic control that adjusts acceleration characteristics according to battery conditions

Inventive Principle:

Principle #15Dynamics

2Power

If high output current is supplied to the battery during acceleration, then acceleration performance is improved, but battery degradation accelerates

Engineering Contradiction:

Improveacceleration powerVSAvoidbattery degradation

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent employs periodic or pulsed acceleration patterns rather than continuous high-power discharge. By controlling the duty cycle and timing of acceleration events, the system allows battery recovery periods that reduce cumulative degradation while maintaining acceptable acceleration performance

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies partial action by providing just sufficient current for acceptable acceleration rather than maximum possible current. The control strategy deliberately limits current output to levels that prevent excessive degradation while still meeting transportation needs

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12071022B2Information processing method, information processing device, and information processing system

Publication Date: 2024.08.27 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An information processing method executed by a computer includes: acquiring an acceleration request for a mobile body that moves using a battery; calculating an output current in the battery based or the acceleration request; calculating a degradation degree of the battery based on the output current; generating an acceleration control instruction in response to the acceleration request in accordance with the degradation degree of the battery; and outputting the generated acceleration control instruction.