Outlet Valve State Detection via Intake Pressure Monitoring
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Solution Overview
Problem
Internal combustion engines face challenges in maintaining particulate filter efficiency during overrun operations, where regeneration reduces filter efficiency and can lead to emission regulation non-compliance due to faulty outlet valves.
Innovation Solution
A method and device for checking the state of outlet valves by evaluating pressure profiles in the intake pipe, determining mean and peak pressure levels, and temporal positions of pressure maxima/minima, to identify and address any faulty valve states, preventing regeneration and ensuring compliance with emission regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outlet valves are closed to prevent regeneration during overrun operation, then particulate filter efficiency is maintained, but faulty valve states can lead to emission regulation non-compliance
Solution Approach 1:
The control unit continuously monitors the actual state of outlet valves by evaluating pressure profiles in the intake pipe and compares this feedback with expected values to detect faulty valve states and ensure emission compliance
Solution Approach 2:
The patent replaces direct mechanical valve position sensing with an indirect pressure-based detection method, using pressure profiles in the intake pipe to infer valve state without additional mechanical sensors
2Measurement precision
If pressure monitoring is performed to detect outlet valve state, then faulty valves can be identified, but additional measurement systems are required
Solution Approach 1:
The existing pressure sensor in the intake pipe, originally used for other engine control functions, is also utilized for outlet valve state detection, eliminating the need for dedicated measurement hardware
Solution Approach 2:
The system uses its own existing pressure measurement infrastructure to monitor valve state, making the detection capability self-contained without requiring external or additional measurement systems
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 effectively identifies and addresses faulty outlet valves, preventing regeneration and reducing oxygen flow to the particulate filter, thereby maintaining filter efficiency and reducing carbon dioxide emissions.
Implementation Method 1
checking whether the outlet valves of the combustion chambers of the motor vehicle are in a closed state by evaluating the pressure prevailing in an intake pipe of the motor vehicle
Data Source
AI summary
Various embodiments of the teachings herein include methods for operating a motor vehicle having combustion chambers. The methods may include: closing the combustion chambers of the motor vehicle towards the exhaust tract by bringing outlet valves of the combustion chambers into the closed state; checking whether the outlet valves of the combustion chambers of the motor vehicle are in a closed state by evaluating the pressure prevailing in an intake pipe of the motor vehicle; and in the event one or more of the outlet valves are not in a closed state, initiating countermeasures to comply with emissions protocols.