Hybrid Vehicle Engine Load Point Control for Battery Charging
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Solution Overview
Problem
Hybrid electric vehicles face inefficiencies in charging their batteries, particularly in urban environments where quick charging is needed, and existing methods do not optimally balance energy efficiency and acoustic emissions during internal combustion engine operation.
Innovation Solution
A method that shifts the load point of the internal combustion engine within a favorable efficiency and acoustic emissions range to charge the battery, allowing for continuous adjustments based on predicted energy demand and actual charging capacity, and escalates to less favorable shifts if necessary to achieve target charging states, while considering torque limits and driver profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the load point of the internal combustion engine is shifted upward to charge the battery quickly, then the charging speed is improved, but the energy efficiency and acoustic emissions deteriorate
Solution Approach 1:
The control apparatus calculates a target charging state for a future point in time based on predicted energy demand, and determines the required target charging capacity in advance. This allows the internal combustion engine to be operated at optimal charging points beforehand, avoiding the need for inefficient high-load operation when quick charging is actually needed.
Solution Approach 2:
The load point of the internal combustion engine is dynamically adjusted within favorable engine-map ranges based on actual charging capacity feedback. The system continuously monitors whether the target charging state is achieved and adapts the operating point accordingly, allowing efficient operation across varying conditions rather than fixed high-load charging.
2Productivity
If the load point of the internal combustion engine is shifted upward to charge the battery quickly, then the charging speed is improved, but the acoustic emissions increase
Solution Approach 1:
By calculating the target charging state for a future point in time and determining the required charging capacity in advance, the system can plan the charging process to occur during periods when the vehicle is already in operation, avoiding the need for additional high-noise engine operation dedicated solely to charging.
Solution Approach 2:
The system changes operating parameters by selecting favorable engine-map ranges that balance charging capacity with acoustic emissions. The load point is adjusted within these favorable ranges rather than always operating at maximum load, thereby reducing noise while maintaining effective charging.
3Use of energy by moving object
If the target charging state is specified for a future point in time based on multiple parameters, then the energy supply optimization is improved, but the control complexity increases
Solution Approach 1:
The control apparatus integrates multiple functions into a single control unit that handles energy demand prediction, target charging state calculation, charging capacity determination, and engine load point adjustment. This multi-functional approach consolidates complexity rather than distributing it across separate systems.
Solution Approach 2:
The system continuously monitors the actual charging capacity and compares it with the target charging capacity. Based on this feedback, the control apparatus adjusts the load point of the internal combustion engine and updates the target charging state calculations, creating a self-regulating system that manages complexity through adaptive control rather than rigid programming.
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 method ensures efficient and effective electrical energy supply to the hybrid electric vehicle, maintaining optimal energy and acoustic performance by using load point shifts that are favorable in terms of energy and acoustics, ensuring a stable battery charge and reducing thermal and electrical losses.
Implementation Method 1
an electric machine used to propel the vehicle also can be operated in a generator mode to charge a battery of the vehicle
Data Source
AI summary
A method for operating a hybrid electric vehicle including an electric machine, a battery and an internal combustion engine, the load point of which is shifted upward to drive the electric machine for charging the battery in the generator mode, wherein a target state of charge of the battery is specified; a required target charging capacity is determined; the load point of the internal combustion engine initially is only shifted upward within an engine-map range of the internal combustion engine.