Hybrid Vehicle Generation Control Apparatus for Battery State of Charge
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Solution Overview
Problem
Hybrid vehicles face challenges in maintaining an appropriate state of charge for their batteries while minimizing CO2 emissions associated with electric power generation, as existing systems often overcharge batteries, leading to unnecessary fuel consumption and increased CO2 discharge, especially when output requirements fluctuate.
Innovation Solution
A generation control apparatus and method for hybrid vehicles that includes a second generation mode, activating the generator in a high load state when power consumption exceeds its maximum output, and continuing operation until a target state of charge is reached, then switching to a first generation mode to maintain the charge, using a zone determination system to adjust power consumption and generation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is charged to the upper limit level (generation end value SOCend) after generation starts, then the battery state of charge is maintained high, but fuel consumption increases and CO2 discharge increases due to unnecessary charging
Solution Approach 1:
The patent applies dynamics by making the generation end value SOCend variable rather than fixed. The SOCend is dynamically adjusted based on the relationship between the battery's output capability and the motor's required output. When the battery can meet the motor's requirements, SOCend is set lower; when the battery output is insufficient, SOCend is set higher. This dynamic adjustment prevents unnecessary charging to a fixed upper limit, reducing fuel consumption and CO2 emissions while maintaining adequate battery charge levels.
2Reliability
If the battery is charged to the upper limit level (generation end value SOCend), then the battery has sufficient charge for high output requirements, but the generation cycle cannot be extended and generator operation frequency increases
Solution Approach 1:
The patent makes the generation end value SOCend dynamically adjustable based on battery output capability and motor required output. When battery output capability is sufficient to meet motor requirements, SOCend is set to a lower value, allowing the generation cycle to be extended and generator operation frequency to decrease. When battery output capability is insufficient, SOCend is raised to ensure adequate charge储备. This dynamic approach optimizes the balance between maintaining sufficient battery charge and extending generation cycles.
3Adaptability or versatility
If the generation end value SOCend is set high, then the battery can meet high output demands, but CO2 discharge increases due to excessive charging when output requirements are low
Solution Approach 1:
The patent applies dynamics by making SOCend variable based on the ratio of battery output to motor required output. When the battery's output capability is high relative to motor requirements, SOCend is set lower, reducing unnecessary charging and CO2 emissions. When battery output capability is low relative to requirements, SOCend is set higher to ensure adequate charge储备 for high output demands. This dynamic adjustment optimizes the balance between output adaptability and CO2 emission reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively maintains the battery's state of charge while reducing CO2 emissions by optimizing power generation and consumption, ensuring the battery can meet varying output demands without overcharging.
Implementation Method 1
a generation unit provided with an internal combustion engine and a generator which generates electric power by operation of the internal combustion engine
Data Source
AI summary
There is provided a generation control apparatus for a hybrid vehicle having a second generation mode which controls a generation unit so as to suppress the reduction of a state of charge of a battery, wherein the generation control apparatus activates the generation unit with a high load state in which an electric power that is consumed in the hybrid vehicle over a predetermined period of time becomes larger than a maximum output electric power of the generation unit, while controlling the generation unit to operate in the second generation mode unless the battery reaches the target state of charge and thereafter continues to drive the generation unit until the state of charge of the battery reaches a target state of charge of the battery, when the electric power over the predetermined period of time becomes smaller than the maximum output electric power.