HC Adsorption Catalyst Air Feed Control
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Solution Overview
Problem
The existing technologies fail to prevent temporary deterioration of exhaust emissions when the temperature of the HC adsorption and removal catalyst is within the desorption temperature to HC removal temperature region, leading to increased HC discharge.
Innovation Solution
An internal combustion engine equipped with an HC adsorption and removal catalyst and an air feed device, where the control device controls air feed to the catalyst when its temperature is between the desorption and HC removal temperatures, ensuring that the HC desorbed can react with oxygen and be removed, thereby preventing emission deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the temperature of the HC adsorption and removal catalyst is in the temperature region from the desorption temperature to the HC removal temperature, then the HC desorption occurs from the HC adsorbent, but the HC removal rate is insufficient leading to increased HC discharge and temporary deterioration of exhaust emissions
Solution Approach 1:
The patent applies preliminary action by feeding air to the HC adsorption and removal catalyst in advance when the catalyst temperature reaches the desorption temperature, before the HC removal temperature is reached. This ensures that oxygen is available when HC desorption occurs, allowing immediate oxidation and removal of desorbed HC, thereby preventing HC discharge and emission deterioration.
Solution Approach 2:
The patent uses air (oxygen) as an intermediary substance to facilitate the removal of HC. By introducing air to the catalyst, oxygen acts as a mediator that enables the oxidation and removal of HC that has desorbed from the HC adsorbent, converting the harmful HC into less harmful oxidation products.
2Device complexity
If air is not fed to the HC adsorption and removal catalyst when the temperature is between desorption temperature and HC removal temperature, then the device structure remains simple, but the exhaust emissions deteriorate due to increased HC discharge
Solution Approach 1:
The patent applies parameter changes by monitoring the catalyst temperature and changing the air feed parameter based on temperature conditions. When the catalyst temperature reaches the desorption temperature, the air feed is activated; when the temperature reaches the HC removal temperature, the air feed is stopped. This dynamic parameter adjustment prevents HC discharge without requiring complex structural modifications.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the catalyst temperature and adjusting the air feed accordingly. The temperature sensor provides feedback to the control unit, which then adjusts the air feed device to maintain optimal conditions for HC removal, preventing emission deterioration while avoiding unnecessary complexity.
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 solution effectively keeps exhaust emissions from deteriorating by ensuring that HC is removed when it is desorbed, maintaining cleaner emissions within the specified temperature range.
Implementation Method 1
an HC adsorbent adsorbing hydrocarbons in the exhaust
Implementation Method 2
a catalyst removing the hydrocarbons
Implementation Method 3
an air feed device for feeding air to the HC adsorption and removal catalyst
Data Source
AI summary
An internal combustion engine includes an engine body, an HC adsorption and removal catalyst in an exhaust, including an HC adsorption layer and a catalyst layer, and having a desorption temperature of the HC from the HC adsorption layer lower than an HC removal temperature of a temperature where a rate of removal of HC at the catalyst layer is a predetermined rate or more when an air-fuel ratio of the exhaust is near the stoichiometric air-fuel ratio, and an air feed device for feeding air to the HC adsorption and removal catalyst. A control device for an internal combustion engine includes an air feed control for controlling feed air to the HC adsorption and removal catalyst when a condition stands. The condition includes the temperature of the HC adsorption and removal catalyst being the desorption temperature or more and less than the HC removal temperature.