Hybrid Vehicle Generation Control Apparatus NV and Efficiency
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Solution Overview
Problem
Hybrid electric vehicles face a trade-off between maintaining noise vibration (NV) performance and energy efficiency, as high auxiliary power requirements from the internal combustion engine can lower NV performance and increase CO2 emissions, while prioritizing energy storage for high-speed engine operation conflicts with achieving optimal NV performance.
Innovation Solution
A generation control apparatus that evaluates driving conditions based on energy consumption, NV performance, and generation efficiency to determine when to operate the internal combustion engine, setting target state of charge for the battery and adjusting generation amounts to balance energy needs with NV performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the internal combustion engine is driven at high revolution speeds to supply great auxiliary electric power, then the energy supply capability is improved, but the NV performance is lowered
Solution Approach 1:
The patent implements dynamic adjustment of the APU output based on real-time evaluation of driving conditions, battery state of charge, and power requirements. The system transitions from static high-power operation to dynamic power level adjustment, matching the APU output to actual needs rather than maintaining high revolution speeds continuously.
Solution Approach 2:
The system changes the operating parameters of the APU by adjusting the target state of charge (SOC) of the battery as a control variable. By dynamically setting the target SOC based on driving conditions, the system optimizes the balance between power supply requirements and NV performance without requiring the engine to operate at high speeds continuously.
2Use of energy by moving object
If the internal combustion engine is driven to maintain high battery charge levels, then the energy availability is improved, but the CO2 emissions and NV performance degradation increase
Solution Approach 1:
The system employs feedback control by continuously monitoring the actual battery SOC and comparing it with the dynamically determined target SOC. Based on this comparison and driving condition evaluation, the system adjusts the APU operation to achieve the target SOC, avoiding unnecessary high-speed engine operation and associated emissions.
Solution Approach 2:
The system performs preliminary evaluation of driving conditions and power requirements to determine the appropriate target SOC in advance. This allows the APU to operate at optimal levels to achieve the predetermined charge level without excessive emissions, rather than maintaining high charge levels continuously.
3Reliability
If the battery SOC is maintained at high levels to ensure energy availability, then the power supply reliability is improved, but the generation efficiency is reduced
Solution Approach 1:
The system dynamically determines the target SOC based on actual driving conditions and power requirements rather than maintaining a fixed high SOC level. This dynamic approach ensures sufficient power supply reliability while allowing the APU to operate at efficient power levels, improving overall generation efficiency.
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
The apparatus enables compatible energy supply and NV performance, allowing the vehicle to maintain efficiency and reduce NV performance degradation, even under high energy demand conditions.
Implementation Method 1
a generator (111) which generates electric power by operating an internal combustion engine (109)
Implementation Method 2
a motor (107) which is driven by electric power supplied from at least one of the battery (101) and the generating unit (121)
Implementation Method 3
an internal combustion engine (109) which generates electric power by operating the internal combustion engine (109)
Data Source
AI summary
A hybrid vehicle includes a battery, a generating unit having an internal combustion engine and a generator which generates electric power by operating the internal combustion engine to supply the generated electric power to a motor or the battery, and the motor which is driven by the electric power supplied from at least one of the battery and the generating unit. A generation control apparatus for the hybrid vehicle evaluates the driving condition of the vehicle from viewpoints of the energy consumption at the motor, the NV performance of the vehicle and the generation efficiency of the generating unit and determines whether or not the operation of the generating unit is necessary based on an evaluation parameter of any one or more viewpoints.