Parked EV Energy Control for Stationary Functions and Range Reserve
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Solution Overview
Problem
Electric vehicles face limitations in providing stationary functions due to high-voltage systems being switched off when parked, leading to reduced range and user discomfort from unexpected energy depletion.
Innovation Solution
A method and control device that utilize an energy profile to manage energy transfer from a high-voltage to a low-voltage system, allowing stationary functions while considering user preferences and needs, ensuring energy is reserved for driving range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the high-voltage system is switched off in the parked state to maximize driving range, then energy consumption for driving is optimized, but stationary functions cannot be provided and user comfort deteriorates
Solution Approach 1:
The patent segments the energy management into two independent systems: a low-voltage system (12V) for stationary functions and a high-voltage system (HV) for driving. The low-voltage battery can be recharged from the high-voltage battery via a DC-DC converter, allowing stationary functions to operate independently without depleting the high-voltage battery intended for driving. This segmentation resolves the contradiction by enabling both driving range optimization and stationary function availability.
Solution Approach 2:
The patent introduces a DC-DC converter as an intermediary device that enables energy transfer from the high-voltage system to the low-voltage system. This intermediary allows the high-voltage battery to recharge the low-voltage battery, thereby enabling stationary functions to be provided without directly consuming high-voltage energy that would reduce driving range. The DC-DC converter mediates between the two systems to resolve the contradiction.
2Use of energy by moving object
If the low-voltage battery is used to power stationary functions, then the high-voltage system can remain off preserving range, but the limited energy storage in the low-voltage battery causes unexpected energy depletion
Solution Approach 1:
The patent implements an energy profile-based feedback mechanism that continuously monitors the state of charge of both batteries and the user's energy requirements. The control device uses this feedback to dynamically manage energy transfer from the high-voltage battery to the low-voltage battery, ensuring that sufficient energy is available in the low-voltage system for stationary functions while maintaining adequate charge in the high-voltage battery for driving. This feedback loop prevents unexpected energy depletion and improves reliability.
Solution Approach 2:
The patent employs preliminary action by proactively transferring energy from the high-voltage battery to the low-voltage battery before the low-voltage battery is fully depleted. The energy profile predicts future energy requirements for stationary functions and initiates recharging in advance, ensuring that energy is available when needed without causing unexpected depletion. This preliminary action enhances reliability by preventing energy shortages.
3Ease of operation
If energy is transferred from the high-voltage to low-voltage system to enable stationary functions, then user comfort is improved, but the high-voltage energy storage is reduced affecting driving range
Solution Approach 1:
The patent implements dynamic energy management where the amount of energy transferred from the high-voltage to low-voltage system is continuously adjusted based on real-time conditions. The control device monitors the state of charge of both batteries, the user's energy profile, and driving requirements to dynamically optimize the energy transfer rate and amount. This dynamic approach allows maximum user comfort for stationary functions while preserving sufficient high-voltage energy for driving, resolving the contradiction between comfort and energy availability.
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 more efficient and user-friendly energy management, reducing the risk of unexpected energy depletion and enhancing the availability of stationary functions without compromising vehicle range.
Implementation Method 1
a DC-DC converter, in order to be able to recharge the low-voltage battery from the high-voltage battery
Data Source
AI summary
A method for controlling an operation of a motor vehicle, which includes a low-voltage on-board electrical system and a high-voltage on-board electrical system having a high-voltage energy storage device. In order to provide at least one stationary function in a parked state of the motor vehicle, a component of the motor vehicle that carries out the stationary function is supplied with energy from the low-voltage onboard electrical system, at least one energy profile, which relates to the use of the at least one stationary function by a user of the motor vehicle, is provided and the operation of the motor vehicle is controlled depending on this energy profile.