Sequential Heater Control in Electric Catalyst Units for Ammonia Dissociation
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Solution Overview
Problem
Conventional electric catalyst units for ammonia dissociation in vehicles require significant power, leading to excessive current draw from the vehicle battery, which can drain the battery and impact other electrical components, and are inefficient due to binary operation of heating elements.
Innovation Solution
An electric catalyst unit with multiple sections, each containing a heating element and a temperature sensor, controlled by a controller that adjusts the heater percentage and powers elements only when necessary to maintain a threshold temperature, preventing excessive current draw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single heating element is always fully energized to maintain temperature for ammonia dissociation, then the required temperature is achieved, but excessive current is drawn from the power supply
Solution Approach 1:
The heating element is divided into multiple sections (first heating element in first section, second heating element in second section) that can be independently controlled. The controller selectively energizes only the sections that need heating based on temperature sensor feedback, rather than energizing the entire heating element continuously. This segmentation allows partial energization to maintain temperature while reducing overall power consumption.
Solution Approach 2:
The system transitions from static binary operation (fully on or fully off) to dynamic partial operation. The controller adjusts the heater percentage of individual heating elements based on real-time temperature measurements, enabling continuous modulation of power delivery. This dynamic control allows the system to maintain catalyst temperature while consuming only the necessary amount of power.
2Temperature
If high current is repeatedly drawn from the vehicle battery to heat the electric catalyst unit during constant stop-and-go conditions, then the catalyst reaches operating temperature, but the battery may be rapidly drained or damaged
Solution Approach 1:
By segmenting the heating element into multiple independently controllable sections, the system can distribute the heating load and selectively activate only the necessary sections. This reduces the peak current draw from the battery while still achieving the required catalyst temperature, thereby protecting battery health during repeated stop-and-go operations.
Solution Approach 2:
The controller applies partial action by energizing heating elements only to the extent necessary to maintain catalyst temperature above the threshold. Rather than continuously applying full power, the system uses temperature feedback to determine the minimum required heating, reducing unnecessary current draws and preserving battery capacity during idle or low-demand periods.
3Device complexity
If a single heating element operates in binary mode (fully on or fully off), then the control is simple, but unnecessary electric current is drawn when full power is not needed
Solution Approach 1:
Dividing the heating element into multiple independently controllable sections enables granular power management. Each section can be individually adjusted based on temperature requirements, allowing the system to escape the binary on/off limitation and achieve variable power delivery without requiring a complete redesign of the control architecture.
Solution Approach 2:
The system implements dynamic control by continuously monitoring temperature and adjusting the heater percentage of individual heating elements in real-time. This transforms the static binary operation into a dynamic system that adapts power delivery to actual thermal needs, reducing energy waste while maintaining relatively simple control logic based on feedback from temperature sensors.
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
The solution efficiently maintains the required temperature for ammonia dissociation while minimizing power consumption, preserving battery health and reducing unnecessary current draws, ensuring continuous operation without battery degradation.
Implementation Method 1
an electric catalyst unit can be utilized during a cold start of an internal combustion engine, or during low load engine operation, where the temperature of the exhaust gas from the engine is relatively low. Electric catalyst units can heat a catalyst to a temperature sufficient to perform ammonia dissociation
Implementation Method 2
a first temperature sensor coupled to the first section; a second temperature second coupled to the second section
Implementation Method 3
the controller increases a heater percentage of the first heating element if a temperature detected by the first temperature sensor is below a threshold temperature
Implementation Method 4
The ammonia dissociation reaction is highly endothermic, meaning that a significant amount of heat is required to break the chemical bonds of ammonia molecules
Data Source
AI summary
The present invention relates, in general, to a system and method for sequentially energizing heating elements in an electric catalyst unit for ammonia dissociation on-board a vehicle. The present invention utilizes output temperature readings at various sections within the electric catalyst unit, and sequentially energizes corresponding heating elements only if the output temperature of an upstream section is below a threshold temperature required for ammonia dissociation to occur. By sequentially energizing heating elements as needed, versus fully energizing every heating element, the present invention mitigates the risk of degradation and failure of the vehicle power system and other electrical components in the vehicle.