Vehicle Controller Dynamic Charge Discharge Range Adjustment
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Solution Overview
Problem
The performance of power storage devices in hybrid and electric vehicles is limited by temperature and state of charge conditions, restricting motor traveling range and braking force, and existing technologies struggle to optimize these factors for enhanced fuel economy and safety.
Innovation Solution
A vehicle controller system that includes an electric motor, a power storage device, and a charge/discharge controller, which adjusts charge/discharge ranges based on driving conditions and activates a wider charge/discharge range during cruise control to optimize battery performance, and automatically extends the power limit for regenerative braking during potential collision situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charge/discharge range for the power storage device is narrowed to prevent overcharging or over-discharging, then the reliability of the power storage device is improved, but the performance of the power storage device cannot be optimized, making it difficult to expand the motor traveling range
Solution Approach 1:
The patent applies dynamics by making the charge/discharge range adjustable based on driving conditions. The control unit dynamically switches between a first charge/discharge range (narrower, for normal operation) and a second charge/discharge range (wider, for expanding motor traveling range). This resolves the contradiction by adapting the range to specific operational contexts, ensuring reliability during normal use while enabling expanded performance when conditions permit.
Solution Approach 2:
The patent changes the parameter of charge/discharge range width based on detected driving conditions. The control unit adjusts the permissible charge/discharge limits according to the state of the power storage device and vehicle operation requirements. This allows the system to optimize power storage device performance and expand motor traveling range while maintaining safety through conditional parameter adjustment.
2Productivity
If electric motor output torque is increased to expand motor traveling range, then the motor traveling range is improved, but the performance of the power storage device cannot be optimized due to temperature and state of charge limitations
Solution Approach 1:
The system dynamically adjusts the charge/discharge range based on real-time detection of power storage device temperature and state of charge. When these parameters indicate healthy device state, the system expands to a wider charge/discharge range, enabling increased electric motor output torque and extended motor traveling range while maintaining power storage device reliability.
3Force
If the braking force of the regenerative brake is increased under automatic brake control, then the braking performance is improved, but the performance of the power storage device cannot be optimized depending on battery state of charge or temperature
Solution Approach 1:
The control unit dynamically adjusts the charge/discharge range specifically during automatic brake control operations. When a need for automatic braking is detected, the system switches to a wider charge/discharge range, enabling increased regenerative braking force while accounting for power storage device state. This resolves the contradiction by allowing high braking performance when needed while maintaining power storage device reliability through conditional range adjustment.
4Reliability
If the charge/discharge range is narrowed to account for overshoot or undershoot, then the reliability of the power storage device is improved, but the performance of the power storage device cannot be optimized
Solution Approach 1:
The system dynamically adjusts the charge/discharge range based on detected driving conditions and power storage device state. Instead of using a permanently narrowed range, the control unit switches between a first narrower range (for normal operation with safety margins) and a second wider range (when conditions permit optimization). This resolves the contradiction by making the range adaptive rather than static.
Solution Approach 2:
The control unit changes the charge/discharge range parameters based on real-time detection of driving conditions and power storage device state. When the device is in a healthy state and conditions permit, the system expands the permissible charge/discharge range to optimize performance. This dynamic parameter adjustment allows the system to maintain reliability while achieving optimal performance when appropriate.
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 solution optimizes battery performance by expanding the charge/discharge range during cruise control, improving fuel economy and allowing more frequent use of the electric motor, while ensuring safety by enhancing regenerative braking force during automatic brake control.
Implementation Method 1
a power storage device that is connected to the electric motor
Data Source
AI summary
A vehicle controller includes an electric motor connected to wheels, a power storage device connected to the electric motor, a charge/discharge controller that controls charge/discharge of the power storage device, a first traveling controller that controls the electric motor in accordance with a driver's operation, and a second traveling controller that controls the electric motor in accordance with a cruise function that automatically controls a vehicle speed. When the first traveling controller controls the electric motor, the charge/discharge controller controls charge/discharge power of the power storage device within a first charge/discharge range. When the second traveling controller controls the electric motor, the charge/discharge controller controls charge/discharge power of the power storage device within a second charge/discharge range that is wider than the first charge/discharge range.