Electronic Control Unit Prevents Particulate Filter Overheating
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Solution Overview
Problem
In motor vehicles equipped with particulate matter removal filters, the filters can become overheated during engine braking, especially when there is a significant deposition of particulate matters, leading to unnecessary high temperatures due to excessive air supply.
Innovation Solution
The implementation of an electronic control unit that prevents engine braking and sequential shift operations when the particulate matter deposition exceeds a predetermined amount, thereby restricting air supply to the filter and maintaining a stable temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If engine braking is activated by carrying a downshift when particulate matters are deposited in the filter, then the filter temperature rises and regeneration is promoted, but the filter becomes overheated due to excessive air supply
Solution Approach 1:
The control unit prohibits sequential shift operations before engine braking can cause overheating. By detecting particulate matter deposition amount in advance and preventing downshift operations when deposition exceeds the threshold, the system stops the harmful process before it starts, avoiding excessive air supply and filter overheating
Solution Approach 2:
The control unit continuously monitors the deposition amount of particulate matters in the filter and uses this feedback information to control shift operations. When the deposition amount reaches a predetermined threshold, the control unit activates the prohibition flag to prevent sequential shifts, creating a closed-loop control system that adjusts shift availability based on real-time filter status
2Object-affected harmful factors
If sequential shift operation is restricted when particulate matter deposition is high, then filter overheating is prevented, but driver's shift control capability is reduced
Solution Approach 1:
The availability of sequential shift operation is made dynamic rather than fixed. The control unit adjusts shift control capability in real-time based on filter deposition conditions, allowing full shift functionality when deposition is low and automatically restricting it when deposition exceeds the threshold, creating an adaptive system that responds to changing operational conditions
3Adaptability or versatility
If upshift is allowed when particulate matter deposition is high, then shift operation flexibility is maintained, but the original state cannot be regained and filter overheating occurs
Solution Approach 1:
The sequential shift operation is segmented into allowed and prohibited states based on deposition conditions. When deposition exceeds the threshold, the control unit segments the shift operations by prohibiting both upshift and downshift, preventing the system from transitioning to states that would lead to overheating while ensuring the ability to return to the original state by maintaining the current gear position
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 prevents filter overheating by controlling engine operations to avoid excessive air supply during high particulate matter deposition, ensuring the filter operates within a safe temperature range and informing the driver of the restrictions to prevent discomfort.
Implementation Method 1
a particulate matter removal filter that removes particulate matters
Implementation Method 2
the particulate matters deposited in the filter burn
Data Source
AI summary
A motor vehicle includes an engine having, in an exhaust system thereof, a particulate matter removal filter that removes particulate matters, a shift device capable of performing a sequential shift operation, and an electronic control unit that controls the engine such that the motor vehicle runs in accordance with a driver's operation. The electronic control unit is configured to perform control in such a manner as to cause the vehicle to run without carrying out a shift even when the sequential shift operation is performed by the driver, if a deposition amount of particulate matters deposited in the particulate matter removal filter is equal to or larger than a predetermined amount. Thus, the particulate matter removal filter can be restrained from being overheated through the supply of a large amount of air to the particulate matter removal filter with the predetermined amount or more of particulate matters deposited therein.