Automotive Alternator Coupling Control for Lower Fuel Load
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automotive alternators contribute to fuel consumption and carbon dioxide emissions by acting as a mechanical load on the engine, even when the battery is fully charged, due to their continuous operation in modern vehicles with complex electrical systems, leading to increased fuel consumption and harmful emissions.
Innovation Solution
A method and system for managing an alternator that selectively couples and uncouples from the crankshaft and electrical system based on battery charge levels and driving conditions, using an ECU to control mechanical and electrical connections, keeping the alternator uncoupled when the battery is fully charged and coupling it only when necessary to reduce mechanical load and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the alternator operates continuously to supply electrical energy and recharge the battery, then the electrical system is ensured, but fuel consumption and carbon dioxide emissions increase due to mechanical energy consumption from the crankshaft
Solution Approach 1:
The alternator operates intermittently rather than continuously, being selectively coupled and uncoupled from the crankshaft based on battery charge level and driving conditions. The control unit monitors battery state of charge and alternator operating conditions, coupling the alternator only when necessary for battery recharging or when electrical loads require power, thereby reducing unnecessary mechanical energy consumption from the crankshaft and lowering fuel consumption while ensuring electrical system reliability.
2Loss of energy
If the alternator is electrically disconnected when battery charge is sufficient, then fuel consumption is reduced, but the battery charge level must be continuously monitored and managed
Solution Approach 1:
The control unit continuously monitors the battery state of charge and alternator operating conditions, using this feedback information to make real-time decisions about alternator coupling and disconnection. The system adjusts alternator operation based on actual battery needs and driving conditions, optimizing the balance between fuel consumption reduction and electrical system reliability without requiring overly complex control mechanisms.
3Loss of energy
If the alternator is selectively coupled and uncoupled based on battery charge level and driving conditions, then fuel consumption and emissions are reduced, but the coupling and uncoupling operations may cause mechanical shocks orjolts
Solution Approach 1:
The control unit anticipates coupling and uncoupling operations by monitoring battery state of charge and driving conditions in advance, planning alternator engagement timing to occur during appropriate moments (such as when the vehicle is already moving or during gear changes) to minimize mechanical shocks and jolts to the crankshaft and vehicle operation.
4Productivity
If the alternator operates at high efficiency, then electrical energy production is optimized, but the mechanical load on the crankshaft increases, leading to higher fuel consumption
Solution Approach 1:
The alternator's mechanical coupling to the crankshaft is made dynamic rather than fixed, allowing the alternator to be selectively engaged and disengaged based on real-time operating conditions. This dynamic coupling approach enables the system to optimize the balance between electrical energy production and mechanical load on the crankshaft, ensuring the alternator operates at high efficiency when engaged while minimizing overall mechanical energy consumption through strategic disengagement during periods when battery charge is sufficient or electrical loads are low.
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 approach reduces fuel consumption and emissions by up to 4% compared to conventional alternators, minimizing the 'jolt' during coupling and optimizing battery charging during vehicle cut-off conditions, thereby reducing mechanical load and pollutant emissions.
Implementation Method 1
The alternator supplies all electrical devices during vehicle operation and recharges the battery, and its designation is a reference to the type of current produced. This device works according to the fundamentals of electromagnetic induction: electric current flows through the rotor creating a magnetic field that induces the movement of electrons in the stator coils, resulting in an alternating current.
Data Source
AI summary
A method and system for managing an automotive alternator are described for a vehicle having an internal combustion engine. The alternator is controlled by an electrical control unit (ECU) designed to facilitate electrical and mechanical coupling of the alternator to a battery. The ECU receives signals from a battery charge sensor to: determine a battery charge level between: BC1 (corresponding to a fully charge condition); BC2 (corresponding to a working charge level); and BC3 (corresponding to a low charge); and acting on the alternator such that: at level BC1, the alternator is disconnected electrically and mechanically; at leve BC3, the alternator is connected electrically and mechanically; and level BC2, the alternator is coupled mechanically when the vehicle movement speed is greater than a predetermined value (VLim) and when the engine is disengaged to change gear, and the alternator is electrically connected when the vehicle is being driven in cut-off mode.