EHC Warmup Notification With Acceleration Holdback
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Solution Overview
Problem
Catalytic converters in vehicles do not operate efficiently at low temperatures, leading to inefficient removal of pollutants during cold starts, especially in plug-in hybrid vehicles, resulting in high emissions due to incomplete heating of the electrically heated catalyst (EHC) before engine start-up.
Innovation Solution
A method to restrict vehicle acceleration based on the operational state of the EHC by comparing data with threshold values, providing notifications and implementing holdback functions to limit emissions until the EHC reaches its light-off temperature, with the option to bypass these restrictions under certain conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the EHC is heated electrically prior to engine start-up, then the catalyst reaches light-off temperature faster, but the vehicle battery energy is consumed and acceleration is restricted
Solution Approach 1:
The system performs preliminary heating of the EHC using the vehicle battery before engine start-up to ensure the catalyst reaches light-off temperature quickly. This preliminary action prevents harmful emissions during cold start while managing battery energy consumption through intelligent control strategies.
Solution Approach 2:
The control system dynamically adjusts heating parameters including voltage, current, and duration based on battery state of charge, ambient temperature, and vehicle operating conditions. This optimization balances the trade-off between achieving sufficient EHC temperature and conserving battery energy.
2Temperature
If the EHC is heated electrically after engine start-up, then the catalyst maintains light-off temperature, but the alternator energy is consumed and acceleration is restricted
Solution Approach 1:
The system maintains continuous heating of the EHC after engine start-up to ensure the catalyst remains at light-off temperature for optimal emission control. The alternator provides continuous electrical energy to the heating element, with control strategies that optimize energy consumption while maintaining effective catalytic conversion.
3Object-generated harmful factors
If acceleration is restricted during EHC heating, then emissions are reduced, but vehicle performance is degraded
Solution Approach 1:
The system applies preliminary anti-action by restricting acceleration before the EHC reaches light-off temperature, preventing the vehicle from operating in a high-emission state. The control system limits throttle input and acceleration demand during the heating phase, with strategies to manage driver expectations and provide bypass options for urgent situations.
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
Enhances EHC efficiency by reducing emissions through driver notification and controlled vehicle operation, facilitating driver cooperation in minimizing pollutant production during cold starts.
Implementation Method 1
EHCs are catalytic converters adapted to be heated by electrical energization. For example, some EHCs may be adapted to be heated by electrical resistance heaters.
Data Source
AI summary
Systems and methods of electrically heating catalyst (EHC) driver notification are provided. With the goal of increasing driver cooperation in reducing emissions, EHC driver notification systems notify the driver when the EHC is in an inefficient operation state. This notification is provided to the driver so that the driver may consciously operate the vehicle in a fashion that reduces emissions while the EHC is in the inefficient operation state. EHC driver notifications systems may also restrict operation of the vehicle when the EHC is in an inefficient operation state. However, for safety reasons, these systems provide the driver a function to bypass the restriction as needed.