Vehicle Battery Preheating of Emission Loads Before Engine Start
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Solution Overview
Problem
Existing hybrid vehicles face challenges in efficiently preheating emission-relevant loads, such as exhaust gas purification devices, to meet emission standards without requiring static precharging in high-voltage batteries, which can lead to inefficiencies and safety risks.
Innovation Solution
A method and system that dynamically charge emission-relevant loads with electrical energy from a lower-voltage battery before the vehicle starts, ensuring they reach operating temperature before the internal combustion engine, using a control unit to manage energy transfer between batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emission-relevant loads are preheated using static precharging in high-voltage batteries, then emission standards can be met, but energy efficiency deteriorates and safety risks increase
Solution Approach 1:
The invention applies preliminary action by preheating emission-relevant loads (such as exhaust gas purification devices) before the vehicle starts and before the internal combustion engine runs. This is achieved by charging the loads with electrical energy from the 12V battery prior to engine start-up, ensuring they reach operating temperature in advance. This preliminary heating action guarantees emission standards are met from the moment the engine starts, while avoiding the energy inefficiencies and safety risks associated with static precharging of high-voltage batteries.
2Reliability
If emission-relevant loads are preheated before vehicle start-up, then emission standards are met, but energy management complexity increases
Solution Approach 1:
The invention implements self-service by utilizing the 12V battery's existing electrical energy to directly charge emission-relevant loads before vehicle start-up. The control unit manages this process by detecting the state of charge of the 12V battery and automatically controlling the charging of emission-relevant loads when conditions are appropriate. This self-service approach simplifies energy management compared to complex multi-battery systems, as it uses the already-present 12V battery energy without requiring additional precharging infrastructure or complex coordination between multiple energy sources.
3Loss of energy
If 12V battery energy is used to charge emission-relevant loads before start-up, then energy efficiency improves, but the 12V battery discharge risk increases
Solution Approach 1:
The invention applies feedback by implementing a control unit that continuously monitors the state of charge of the 12V battery and dynamically adjusts the charging of emission-relevant loads based on real-time conditions. The control unit only initiates charging of emission-relevant loads when the 12V battery has sufficient charge, and stops charging when the battery reaches a predetermined discharge threshold. This feedback mechanism ensures that the 12V battery never discharges below safe levels, preventing functionality issues while still maximizing energy efficiency by utilizing available 12V battery energy for preheating emission-relevant loads.
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 efficient preheating of emission-relevant loads without static precharging, meeting emission standards, reducing CO2 emissions, and ensuring functional safety by avoiding redundant energy storage, thus optimizing energy use and cost.
Implementation Method 1
the at least one emission-relevant load is heated with electrical energy from the at least one vehicle battery until an operating temperature intended for this purpose is or has been reached
Data Source
AI summary
A method for operating a vehicle having: an internal combustion engine for driving the vehicle; at least one emission-relevant load; at least one electrical-system battery; and at least one vehicle battery, in which method prior to the start-up of the vehicle, the at least one vehicle battery is charged with electrical energy from the at least one electrical-system battery and, prior to and/or during the start-up of the internal combustion engine, the at least one emission-relevant load is charged with this electrical energy from the vehicle battery.