Engine Torque Reserve for Vehicle Electrical Voltage Stability
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Solution Overview
Problem
Motor vehicles with internal combustion engines and electrical systems face challenges in maintaining stable electrical power supply during high load conditions, particularly when electrical consumers like electric power steering are activated, leading to potential voltage drops and discomfort for the driver.
Innovation Solution
A method that dynamically adjusts the internal combustion engine's injection quantity and ignition point to create a torque reserve, allowing the engine to quickly deliver additional torque to the generator and stabilize electrical voltage, especially during anticipated high-load situations like turning maneuvers, by using a driving situation detection device to recognize imminent driving scenarios and adjust engine operation states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection quantity is increased to provide torque reserve for stabilizing electrical voltage, then the electrical system stability is improved, but the energy consumption increases
Solution Approach 1:
The system performs preliminary action by detecting imminent high-load situations (turning maneuvers) before they occur and pre-adjusting the engine's injection quantity and ignition point to create a torque reserve. This allows the engine to quickly deliver additional torque to the generator when needed, stabilizing electrical voltage without requiring continuous high energy input. The torque reserve is created in advance and only consumed when actually needed.
Solution Approach 2:
The system dynamically adjusts the engine operating parameters (injection quantity and ignition point) based on real-time detection of driving situations. The control unit continuously monitors sensor data and adapts the engine's torque output to match the actual electrical load requirements, optimizing the balance between electrical system stability and energy consumption.
2Reliability
If the engine torque is increased to meet sudden electrical load demands, then the electrical power supply stability is improved, but the engine speed fluctuation increases
Solution Approach 1:
The system creates a torque reserve in advance by adjusting the ignition point and injection quantity before the high-load situation occurs. When the electrical load suddenly increases, the pre-prepared torque reserve can be immediately deployed to the generator, providing the necessary electrical power while minimizing disruptions to engine speed stability.
Solution Approach 2:
The system rushes through the transition by having the torque reserve already prepared and available. When high electrical power is needed, the engine can immediately deliver the additional torque without the delay that would normally be required to adjust injection and ignition parameters, thus maintaining engine speed stability while meeting the sudden electrical demand.
3Use of energy by moving object
If electrical consumers are replaced by hydraulic consumers to reduce CO2 emissions, then the energy efficiency is improved, but the power requirement stability deteriorates
Solution Approach 1:
The system uses feedback from sensors that detect driving situations and electrical load conditions to continuously adjust the engine's torque output. This feedback mechanism ensures that the engine can respond to sudden power demands from electrical consumers while maintaining overall system efficiency, thus preserving both energy efficiency and power supply stability.
Solution Approach 2:
The system changes engine operating parameters (injection quantity, ignition point) dynamically to match the electrical load requirements. By adjusting these parameters in real-time, the engine can efficiently meet the variable power demands of electrical consumers while maintaining stable power supply, thus resolving the contradiction between energy efficiency and stability.
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 ensures that the vehicle's electrical system can handle sudden high loads without voltage collapse, maintaining performance and reducing the likelihood of engine speed fluctuations, thereby enhancing driver comfort and system stability.
Implementation Method 1
the internal combustion engine is operated in a first operating state with a first injection quantity and with a first ignition point
Data Source
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AI summary
The invention relates in particular to a method for reducing the energy consumption of a motor vehicle comprising an internal combustion engine and at least one vehicle electric system, to which at least one electrical consumer is connected. To achieve a high performance vehicle electric system with a reduced energy consumption, the internal combustion engine is operated in a first operating mode with a first injection quantity and a first ignition time. In a second operating mode the internal combustion engine is operated with a second injection quantity that is higher than the first and with a second ignition time. The second ignition time when used with the second injection quantity is not as favourable to the performance of the internal combustion engine as the first ignition time. In a third operating mode, the internal combustion engine is operated with the second injection quantity and predominantly the first ignition time so that the performance of the internal combustion engine is higher in the third operating mode than in the second operating mode. A device for detecting the driving situation, which is provided in the vehicle, recognises an imminent specific driving situation (304) on the basis of the previous behaviour of the driver (102, 104, 105, 107, 108, 110, 111, 201, 205, 206, 210, 212, 213, 302, 303, 401, 403) when controlling the vehicle and/or the behaviour of the vehicle in advance and initiates a switch in operating modes of the internal combustion engine from the first operating mode to the second operating mode.