Hybrid Drive Engine Decoupling for Exhaust Temperature Control
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Solution Overview
Problem
Motor vehicles with hybrid drives face challenges in optimizing internal combustion engine efficiency and emissions, particularly in transitioning between electric and combustion engine modes, which affects fuel consumption and exhaust system temperature management.
Innovation Solution
The method involves decoupling the internal combustion engine from the traction electric motor and continuing its operation based on exhaust system conditions, such as temperature or fouling, to maintain system warmth and enable immediate functionality when switching back to combustion engine mode, while also using an electric machine to recover energy and adjust power settings for efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal combustion engine is switched off during electric operating phase, then fuel consumption is reduced, but exhaust system temperature drops and regeneration capability is lost
Solution Approach 1:
The control strategy performs preliminary action by maintaining exhaust system temperature through controlled engine operation before complete shutdown is required. The system monitors exhaust temperature and regulates engine operation in advance to ensure temperature remains within regeneration range, preventing temperature drop that would occur with immediate shutdown.
Solution Approach 2:
The system dynamically adjusts engine operation between different states (running, idle, shutdown) based on real-time conditions. The control unit continuously monitors exhaust temperature, driving status, and component regeneration needs to dynamically determine the optimal engine state, transitioning smoothly between modes to maintain temperature while minimizing fuel consumption.
2Productivity
If the internal combustion engine is decoupled from the traction electric motor, then electric mode efficiency is improved, but exhaust system temperature management becomes difficult
Solution Approach 1:
The control unit acts as an intermediary between the decoupled engine and exhaust system. Even when the engine is decoupled from the drive train, the control unit regulates engine operation to maintain exhaust flow and temperature. The intermediary control strategy coordinates engine throttle position, fuel injection, and air intake to sustain exhaust temperature independent of mechanical coupling to the drive train.
Solution Approach 2:
The engine serves multiple functions simultaneously: it can be mechanically decoupled from the drive train for electric operation while remaining thermally coupled to the exhaust system for temperature management. The system allows the engine to perform both propulsion function (when coupled) and thermal management function (when decoupled but still operating), making the engine universally useful in both coupled and decoupled states.
3Reliability
If the internal combustion engine continues to operate in decoupled state, then exhaust system temperature is maintained for regeneration, but energy is consumed without mechanical output
Solution Approach 1:
The system applies partial action by operating the engine at minimal necessary power levels rather than full power. When the engine is decoupled for temperature maintenance, it operates at idle or near-idle conditions, consuming only the minimum energy required to sustain exhaust temperature for regeneration. This partial operation avoids excessive energy consumption while ensuring sufficient heat for purification component regeneration.
Solution Approach 2:
The control system implements feedback control by continuously monitoring exhaust temperature, regeneration status, and energy consumption. Based on this feedback, the control unit adjusts engine operation parameters (throttle position, fuel injection rate, air intake) to maintain temperature with minimal energy input. The feedback loop ensures the engine operates only as much as necessary for regeneration, optimizing the balance between reliability and energy efficiency.
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 emissions, maintains exhaust system temperature, and optimizes energy use by allowing the internal combustion engine to idle during electric phases, ensuring immediate functionality and reducing heat loss, thereby improving overall hybrid drive efficiency.
Implementation Method 1
an internal combustion engine connected to an exhaust system of the motor vehicle
Implementation Method 2
at least one traction electric motor that is operated via an electric energy accumulator
Data Source
AI summary
Method for operating a motor vehicle with a hybrid drive, which includes an internal combustion engine connected to an exhaust system of the motor vehicle along with at least one traction electric motor, which is operated via an electric energy accumulator of the motor vehicle and can be coupled to the internal combustion engine, wherein the motor vehicle can be moved via the internal combustion engine and/or the traction electric motor, wherein when movement of the motor vehicle via the internal combustion engine is switched to movement of the motor vehicle solely via the traction electric motor, and the internal combustion engine is decoupled from the traction electric motor, operation of the internal combustion engine is continued, dependent upon at least one piece of exhaust system information describing a condition of the exhaust system.