Vehicle Power Control Unit Dynamic Limit Adjustment
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Solution Overview
Problem
Existing vehicle control systems fail to rapidly adjust input/output limit values to prevent voltage and current from exceeding allowable ranges, despite power being within set limits, leading to potential component damage.
Innovation Solution
A control method for vehicles that dynamically adjusts upper and lower limit values of electric power based on deviations and predicted changes, using a control unit to calculate correction amounts and align boundary values with required electric power, ensuring compliance with limit values and preventing voltage and current overshoots/undershoots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input/output limit value is changed rapidly to prevent voltage and current from exceeding allowable ranges, then the reliability of components is improved, but the stability of power control deteriorates
Solution Approach 1:
The patent applies dynamics by making the power limit values (upper limit value Wout and lower limit value Win) adjustable and time-varying rather than fixed. The control unit dynamically changes these limit values based on real-time battery state (SOC, temperature) and operating conditions, allowing rapid adaptation to prevent voltage/current overshoot while maintaining stability through controlled adjustment rates.
Solution Approach 2:
The patent changes physical parameters (power limit values) to resolve the contradiction. By modifying the upper and lower power limit values based on battery state of charge, temperature, and current/voltage deviations, the system can rapidly respond to protect components while the gradual nature of parameter changes maintains control stability.
2Stability of the object's composition
If the input/output limit value is changed slowly to maintain stable power control, then the stability of power control is improved, but the reliability of components deteriorates due to voltage and current exceeding allowable ranges
Solution Approach 1:
The system dynamically adjusts power limit values based on real-time conditions. When voltage or current approaches critical thresholds, the control unit rapidly modifies the limit values to prevent component damage, while under normal conditions it maintains stable, gradual adjustments.
Solution Approach 2:
The patent implements feedback control by continuously monitoring battery voltage, current, state of charge, and temperature, then using this information to adjust power limit values. The control unit compares actual values with allowable ranges and modifies limits accordingly, creating a closed-loop system that balances stability and protection.
3Adaptability or versatility
If the power limit values are adjusted based on multiple factors (battery state, temperature, voltage, current), then the adaptability of the control system is improved, but the device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it monitors battery state of charge, temperature, voltage, and current; calculates appropriate power limit values; and adjusts motor generator output. This multi-functional approach consolidates complexity into a single control unit while achieving high adaptability through comprehensive parameter consideration.
Solution Approach 2:
The system adjusts multiple parameters (power limit values, motor generator output) based on changes in battery state, temperature, voltage, and current. By coordinating changes across these parameters, the system achieves high adaptability while managing complexity through integrated control logic.
Data Source
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AI summary
ECU 200 executes a program including the steps of: executing addition processing (S104) when current IB is equal to or more than a current upper limit value IB(0) (YES in S100) and there is a divergence between command power Pc and an upper limit value Woutf of an allowable range of electric power at the time of agreement between the current IB and the current upper limit value IB(0) (YES in S102); and executing normal Woutf determination processing (S106) when the current IB is less than the current upper limit value IB(0) (NO in S100) or there is no divergence between the command power Pc and the upper limit value Woutf at the time of agreement between the current IB and the current upper limit value IB(0) (NO in S102).