Forced Charging PHEV Battery Motor HSG Power Maps
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Solution Overview
Problem
Existing methods for forcibly charging high-voltage batteries in PHEVs using a motor-only operation result in low charging power and speed, are disabled by excessive motor temperatures, and do not allow maximum charging over time, leading to reduced fuel efficiency due to premature transition to engine-driven modes.
Innovation Solution
A method utilizing three-dimensional maximum charging power maps to calculate and adjust charging power for simultaneous motor and Hybrid Starter Generator (HSG) operation, with excessive temperature prevention logic to maintain optimal temperatures and extend EV driving mode duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If motor-only operation is used for forced charging, then the system structure is simple, but the charging power and charging speed are low
Solution Approach 1:
The patent combines the motor and HSG into a coordinated dual-generator system for forced charging. The controller manages both components simultaneously, allowing their power outputs to be aggregated and applied to the high-voltage battery, thereby achieving maximum charging power by merging the capabilities of both power generation sources.
Solution Approach 2:
The system enables both the motor and HSG to serve as charging sources during forced charging mode. The controller dynamically allocates charging tasks between these two components based on their operational characteristics and temperature states, making both devices functionally versatile as power generation sources for battery charging.
2Productivity
If motor-only operation is used for forced charging, then the control logic is simple, but the charging speed is low
Solution Approach 1:
The controller dynamically adjusts the charging power distribution between motor and HSG based on real-time temperature monitoring and operational states. The system continuously adapts the power allocation strategy, increasing charging speed when conditions permit and adjusting when temperature limits are approached, thereby optimizing charging productivity under varying conditions.
Solution Approach 2:
The dual-generator system ensures continuous high-power charging action by coordinating both motor and HSG operation. The controller maintains continuous power flow to the battery from both sources simultaneously when conditions allow, maximizing the continuity and intensity of the charging process to achieve faster charging speeds.
3Loss of time
If high charging power is applied, then charging time is reduced, but motor temperature becomes excessive causing power limitation
Solution Approach 1:
The controller acts as an intermediary that manages the thermal load distribution between motor and HSG during forced charging. By monitoring temperature states and dynamically adjusting power allocation, the controller mediates between the need for high charging power (to reduce charging time) and the constraint of preventing excessive temperature rise that would trigger power limitation.
Solution Approach 2:
The system changes operational parameters dynamically during forced charging, specifically adjusting the power output levels of motor and HSG based on real-time temperature measurements. When temperature approaches critical thresholds, the controller modifies power parameters to prevent excessive heating, thereby maintaining charging efficiency without triggering protective power limitation.
4Duration of action of moving object
If motor temperature is not managed, then charging power can be maximized, but the EV driving mode duration is reduced due to premature engine start
Solution Approach 1:
The controller performs preliminary temperature management during forced charging by proactively monitoring and controlling motor and HSG temperatures before they reach critical levels. This preliminary thermal management prevents premature engine startup that would terminate EV mode, thereby extending the duration of electric-only operation while still achieving effective charging.
Solution Approach 2:
The system implements continuous feedback control by monitoring temperature states of motor and HSG during forced charging and adjusting power allocation accordingly. This feedback mechanism ensures that temperature remains within acceptable ranges, preventing the conditions that would trigger engine startup and thereby protecting the duration of EV driving mode while maintaining charging effectiveness.
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
Enables maximum charging power and reduced charging time for high-voltage batteries while preventing temperature-related power limitations, thereby enhancing fuel efficiency by prolonging EV driving mode.
Implementation Method 1
A method utilizing three-dimensional maximum charging power maps to calculate and adjust charging power for simultaneous motor and Hybrid Starter Generator (HSG) operation
Data Source
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AI summary
The present disclosure provides a method of forcibly charging a high-voltage battery using a motor and a Hybrid Starter Generator (HSG) which is capable of forcibly charging the high-voltage battery with maximum charging power using the motor and the HSG simultaneously. The method does so by calculating maximum chargeable power for the high-voltage battery using three dimensional (3D) maximum charging power maps of the motor and the HSG, adjusting maximum charging power using energy integration during forced charging using the motor and the HSG simultaneously, and applying excessive temperature prevention logics for protecting the motor and the HSG from an excessive temperature in a forced charging mode.