Hybrid Vehicle Battery Reserve Control for Temperature-Based EV Exit
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Solution Overview
Problem
Hybrid vehicles face challenges in accurately determining the optimal battery energy reserve to balance the duration of pure electric mode usage and ensuring electrical demand is met, leading to either short pure electric mode time or insufficient energy for vehicle operation.
Innovation Solution
A control method and apparatus that utilize temperature sensors to determine minimum battery energy values based on ambient and power source temperatures, switching to hybrid mode when actual energy falls below the determined threshold, considering different temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If too much battery energy is reserved, then the electrical demand of the hybrid vehicle can be met, but the user can only use the pure electric mode for a short period of time
Solution Approach 1:
The patent implements dynamic adjustment of the battery energy threshold for switching from pure electric mode to hybrid mode based on ambient temperature and power source temperature. The control unit calculates different threshold values according to temperature conditions, making the energy reservation requirement adaptive rather than fixed. This resolves the contradiction by allowing the system to maintain reliability (electrical demand satisfaction) while optimizing pure electric mode duration based on real-time environmental conditions.
Solution Approach 2:
The patent changes the parameter of battery energy threshold based on temperature parameters. By establishing a relationship between temperature (ambient and power source) and the required battery energy threshold, the system dynamically adjusts the switching point between pure electric and hybrid modes. This parameter change approach allows the system to balance electrical demand satisfaction with extended pure electric mode operation under favorable temperature conditions.
2Duration of action of moving object
If too little battery energy is reserved, then the pure electric mode can be used for a longer time, but the electrical demand of the hybrid vehicle cannot be met
Solution Approach 1:
The system dynamically determines the battery energy threshold based on real-time temperature measurements rather than using a fixed conservative value. This dynamic approach allows the system to extend pure electric mode usage when temperatures are favorable while ensuring electrical demand is met when temperatures require higher energy reserves, thus resolving the contradiction between duration and reliability.
Solution Approach 2:
The control unit continuously monitors ambient temperature and power source temperature, using this feedback to adjust the battery energy threshold for mode switching. This feedback mechanism ensures that the system maintains adequate electrical demand satisfaction while maximizing pure electric mode duration by adapting to actual operating conditions rather than relying on fixed conservative thresholds.
3Device complexity
If a fixed battery energy threshold is used for mode switching, then the control logic is simple, but it cannot adapt to different temperature conditions
Solution Approach 1:
The patent introduces temperature parameters (ambient and power source) that dynamically change the battery energy threshold for mode switching. This parameter change approach adds adaptability to different temperature conditions while maintaining relatively simple control logic based on threshold comparison. The system adjusts the threshold parameter based on temperature measurements, achieving adaptability without excessive complexity.
Solution Approach 2:
The patent pre-establishes the relationship between temperature and battery energy threshold, storing the correspondence in advance. The control unit retrieves and applies the appropriate threshold based on measured temperatures, rather than performing complex real-time calculations. This preliminary action approach enables temperature adaptability while keeping the control logic relatively simple through lookup and comparison operations.
Data Source
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AI summary
A control method for a hybrid vehicle, the method includes when the hybrid vehicle operates in a pure electric mode, acquiring a first temperature value for an electric power source of the hybrid vehicle and a second temperature value for a current ambient environment; determining a first battery energy value corresponding to the first temperature value and a second battery energy value corresponding to the second temperature value from a first preset relationship; where the first preset relationship is a minimum remaining battery energy value set for the hybrid vehicle that the electric power source needs to have under different ambient environment temperatures/different electric power source temperatures; and taking a minimum battery energy value of the first battery energy value and the second battery energy value as an exit battery energy value of the pure electric mode, and controlling the hybrid vehicle to exit the pure electric mode and activate a hybrid mode when it is detected that an actual remaining battery energy value of the electric power source is not higher than the exit battery energy value. Also provided are a control apparatus for a hybrid vehicle, a vehicle, and a medium. The control method of the present application realizes reserving the battery energy of the electric power source for different ambient environment temperatures/different electric power source temperatures, so that a user may drive the vehicle in the pure electric mode for a longer time, and sufficient battery energy currently required may also be reserved for the vehicle.