Heating Device Control for Exhaust Purification Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas purifying systems face emission deterioration due to ignition delays of fuel supplied to catalysts, and lack of fuel supply to catalysts in existing technologies.
Innovation Solution
An exhaust purification system with a fuel supply device and heating device, controlled by a controller that adjusts the heating temperature based on the catalyst's state and vehicle operation, ensuring quick ignition and minimizing emission deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heating device is controlled to the ignition temperature immediately, then the ignition delay is reduced and emission deterioration is suppressed, but the energy consumption increases
Solution Approach 1:
The heating device performs preliminary heating to a pre-heating temperature (lower than ignition temperature) when only the first processing request is standing. This preliminary action prepares the heating device in advance so that when the second processing request is added, the ignition temperature can be reached quickly without excessive energy consumption during normal operation.
Solution Approach 2:
The heating control is made dynamic by adjusting the target temperature based on the combination of processing requests. The controller dynamically switches between pre-heating mode (first request only) and ignition mode (both requests standing), optimizing energy consumption while ensuring emission performance when needed.
2Use of energy by moving object
If the heating device is controlled to the pre-heating temperature only, then the energy consumption is reduced, but the ignition delay increases and emission deteriorates
Solution Approach 1:
The controller continuously monitors the standing status of processing requests and adjusts the heating device's target temperature accordingly. When both first and second processing requests are standing, the controller provides feedback to raise the temperature to ignition level, ensuring emission performance is maintained when required.
Solution Approach 2:
The target temperature parameter of the heating device is changed based on processing requests. The system switches between two temperature parameters: pre-heating temperature (energy-saving mode) and ignition temperature (emission control mode), optimizing the balance between energy consumption and emission performance.
3Reliability
If the heating device temperature is raised quickly to ignition temperature, then the ignition delay is suppressed, but the time for catalyst processing is extended
Solution Approach 1:
By performing preliminary heating to the pre-heating temperature in advance, the system reduces the time required to reach ignition temperature when both processing requests are standing. This preliminary action ensures quick ignition response without extending the overall catalyst processing time, as the heating curve is optimized based on request combinations.
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 system effectively suppresses emission deterioration by ensuring the ignition temperature is quickly reached, allowing for efficient catalyst processing and reducing energy consumption during standby periods.
Implementation Method 1
a heating device which heats the fuel supplied from the fuel supply device
Implementation Method 2
a catalytic combustion device having the function of supplying fuel to a catalyst arranged in the exhaust passage
Data Source
AI summary
An exhaust purification system of an internal combustion engine, having an exhaust purification catalyst in the exhaust passage of the engine of a vehicle, a fuel supply device provided in the exhaust passage upstream the exhaust purification catalyst and supplies fuel to an exhaust gas flowing into the catalyst, a heating device which heats the fuel supplied from the fuel supply device, and a controller which controls the heating device. The controller controls the heating device, when a first processing request based on a state of the exhaust purification catalyst is standing and a second processing request based on an operating state of the vehicle is not standing (t2), to a pre-heating temperature lower than an ignition threshold capable of igniting the fuel and, when the first processing request and the second processing request are standing (t3), to an ignition temperature higher than the ignition threshold.