Internal Combustion Engine Idling Speed Control for Electrical Load
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Solution Overview
Problem
Conventional motor vehicles face challenges in maintaining idling speed of internal combustion engines during high electrical load phases, particularly in emergency situations where battery power is disconnected, leading to potential engine stalling and transmission strain.
Innovation Solution
The method involves disconnecting the internal combustion engine from the transmission and applying a predetermined braking force when a power request is detected, allowing the engine to increase idling speed and generate power for the on-board system without overloading the transmission, thereby preventing stalling and ensuring stable power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the idling speed of the internal combustion engine is increased to meet high electrical power requests, then the power supply capability of the on-board system is improved, but the transmission may be overloaded and the engine may stall
Solution Approach 1:
The patent segments the power delivery system by introducing a controllable coupling mechanism between the generator and the transmission. The control unit can decouple the transmission from the generator when high power is needed, allowing the engine to increase speed for maximum generator output without transmitting that torque to the wheels, thus preventing transmission overload while maintaining engine stability
Solution Approach 2:
The control unit monitors the operating state and anticipates high power demand situations. When a power request is detected, the system proactively adjusts the coupling state and engine speed before the full power demand occurs, ensuring smooth transition and preventing engine stalling by preparing the system in advance
2Power
If the connection between the internal combustion engine and transmission is disconnected to allow higher idling speed, then the generator can deliver maximum power, but the vehicle loses drive capability
Solution Approach 1:
The patent implements a dynamic coupling mechanism that can rapidly switch between connected and disconnected states based on real-time power demands. The control unit dynamically adjusts the coupling state - disconnecting when maximum generator power is needed and reconnecting when drive capability is required, allowing the system to adapt its configuration optimally for each operating condition
3Power
If the idling speed is increased in a stationary vehicle with non-positively engaged transmission, then the electrical power demand is met, but the transmission is thermally and mechanically strained
Solution Approach 1:
The patent extracts the generator from the transmission power flow path by controlling the coupling mechanism. When high electrical power is needed, the generator is decoupled from the transmission, allowing the engine to spin at high speed to maximize generator output without transmitting torque through the transmission, thereby eliminating thermal and mechanical strain on the transmission during high-power electrical generation
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 safely and reliably increases idling speed, preventing engine stalling and reducing transmission strain, while maintaining stable power supply to electrical consumers even in emergency mode situations.
Implementation Method 1
a generator (3) for supplying an on-board power system (4) of the motor vehicle with electric power, wherein the generator (3) can be driven by means of the internal combustion engine (2)
Data Source
AI summary
A method for setting an idling speed of an internal combustion engine of a motor vehicle, in which the idling speed of the internal combustion engine is increased if a predetermined power request within an on-board power system of the motor vehicle is detected, wherein a generator for electrically supplying the on-board power system is driven by the internal combustion engine, and wherein the internal combustion engine is connected to a transmission of the motor vehicle, wherein the connection between the internal combustion engine and the transmission is disconnected, and/or a predetermined braking force is made available by means of at least one brake of the motor vehicle if the predetermined power request is detected.