Vehicle Control Device Filter Removal Detection
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Solution Overview
Problem
Existing control devices for vehicles lack sufficient accuracy in detecting whether a filter is removed from the exhaust passage, leading to inefficiencies in exhaust management.
Innovation Solution
A control device for a vehicle that includes an energization control unit for the electrically heated catalyst and a detection unit using two temperature sensors to determine if the filter is removed based on temperature differences, with the energization control unit energizing the electrically heated catalyst to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature-based detection is used to determine filter attachment status, then the detection method is simple, but the detection accuracy is insufficient
Solution Approach 1:
The exhaust passage is divided into multiple sections with temperature sensors placed at different locations (upstream and downstream of the filter). By segmenting the measurement points, the system can detect temperature differences caused by filter presence/absence, improving detection accuracy without requiring a single complex sensor
Solution Approach 2:
The system utilizes temperature as a detectable parameter that changes based on filter attachment status. By monitoring temperature differences between upstream and downstream sensors, the system transforms the physical state (filter presence) into a measurable parameter change, enhancing detection accuracy while maintaining system simplicity
2Measurement precision
If the electrically heated catalyst is energized continuously, then the exhaust temperature is maintained for better detection, but energy consumption increases
Solution Approach 1:
The electrically heated catalyst is energized periodically or intermittently rather than continuously. The control device activates the catalyst heating element at specific intervals or under specific conditions to create temporary temperature differences for detection, then reduces heating to minimize energy consumption while maintaining sufficient detection accuracy
Solution Approach 2:
The electrically heated catalyst is energized in advance before detection is needed. By pre-heating the exhaust passage and filter assembly, the system creates favorable thermal conditions for accurate detection, then can reduce or stop heating afterward to conserve energy
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 proposed control device significantly enhances the accuracy of filter removal detection by utilizing temperature differences measured by two sensors, thereby improving exhaust management efficiency.
Implementation Method 1
an energization control unit that controls energization of the electrically heated catalyst
Implementation Method 2
a first temperature sensor and a second temperature sensor that are provided in an exhaust passage
Data Source
AI summary
A vehicle control device controls a vehicle including an internal combustion engine, a filter, an electrically heated catalyst, a first temperature sensor, and a second temperature sensor. An exhaust passage of the internal combustion engine is provided with the electrically heated catalyst, the first temperature sensor, the filter, and the second temperature sensor from an upstream side to a downstream side, and the control device includes an energization control unit that controls energization of the electrically heated catalyst, and a detection unit that detects whether or not the filter is removed based on a first temperature that is a temperature detected by the first temperature sensor and a second temperature that is a temperature detected by the second temperature sensor, and when the detection unit performs detection, the energization control unit energizes the electrically heated catalyst.