Hybrid Catalyst Temperature Control via Threshold Management
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Solution Overview
Problem
Current systems fail to optimally manage the temperature of hybrid vehicle catalysts, leading to inefficient pollutant reduction and excessive fossil fuel consumption, as they do not effectively balance the thermal engine and electric torque management with driver demand and energy storage capabilities.
Innovation Solution
A system that uses an analysis and control means to determine a threshold temperature for the catalyst, adjusting heating based on energy storage parameters and maintaining the catalyst in an active mode to minimize thermal engine use, while optimizing torque management across hybrid vehicle powertrain components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catalyst is continuously heated to maintain active mode, then pollutant reduction efficiency is improved, but fossil fuel consumption increases
Solution Approach 1:
The system performs preliminary heating of the catalyst during periods when electric motor torque is insufficient or unavailable, ensuring the catalyst reaches active mode before extended electric driving sequences begin. This preliminary action allows the catalyst to be maintained in active mode without continuous heating during subsequent electric-only driving periods, thereby reducing fossil fuel consumption while preserving pollutant reduction efficiency.
Solution Approach 2:
The control system dynamically adjusts the catalyst heating strategy based on real-time assessment of electric motor torque availability, energy storage state, and driving conditions. By making the heating decision dynamic rather than static, the system optimizes the balance between maintaining catalyst activity and minimizing fossil fuel consumption according to actual operational requirements.
2Reliability
If the thermal engine is used more frequently to heat the catalyst, then catalyst active mode is maintained, but fossil fuel consumption increases
Solution Approach 1:
The system uses the thermal engine for catalyst heating in advance, during periods when electric torque is insufficient, to bring the catalyst to active mode. This preliminary heating action allows subsequent electric-only driving to proceed without additional fossil fuel consumption, as the catalyst remains active through residual heat and insulation rather than continuous thermal engine operation.
Solution Approach 2:
The system leverages the thermal inertia and insulation properties of the exhaust system to maintain catalyst temperature in active mode without continuous external heating. The catalyst and exhaust components essentially serve themselves by retaining heat, reducing the need for ongoing thermal engine operation and associated fossil fuel consumption.
3Ease of operation
If the electric motor torque is increased to compensate for reduced thermal engine torque during catalyst heating, then driver demand is met, but energy storage discharge rate increases
Solution Approach 1:
The system performs catalyst heating during periods when electric motor torque can be supplied without excessively high discharge rates, such as during moderate driving conditions or when the energy storage is already charged. This preliminary heating action prepares the catalyst for future electric-only driving sequences, allowing the system to later meet driver demand using electric torque alone without the penalty of high discharge rates during the heating phase.
Solution Approach 2:
The control system monitors and responds to changes in energy storage state, adjusting the torque distribution between thermal engine and electric motor accordingly. When the energy storage discharge rate approaches limiting values, the system modifies its catalyst heating strategy, potentially using more thermal engine torque or adjusting the timing of heating actions to avoid sustained high discharge rates while still meeting driver demand.
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 maintains the catalyst at a priming temperature, reducing fossil fuel consumption and ensuring efficient pollutant reduction, allowing for longer electric driving without unnecessary heating, thus minimizing fuel use and extending catalyst lifespan.
Implementation Method 1
The catalytic converter is intended to reduce, by catalysis, the polluting gases, in particular those unburnt in the exhaust
Implementation Method 2
the catalyst being heated during use of the heat engine and having a starting temperature Ta from which said catalyst is in active mode
Data Source
Figure 1
Figure 2~3
AI summary
Said system for controlling the temperature of a catalyst of a hybrid vehicle exhaust line comprises a catalyst having a light-off temperature (Ta) from which the catalyst is in the active mode, wherein a treatment of the exhaust gases is carried out, a variable threshold temperature (Ts) of the catalyst being determined which, once reached, prevents the catalyst from being heated for a duration (t) while remaining in the active mode and when a determined instantaneous temperature (41) of the catalyst is lower than the threshold temperature (Ts), the heating of the catalyst is controlled until the threshold temperature (Ts) is reached. The invention also relates to an identical method and a hybrid motor vehicle comprising said system.