Emission Deterioration Notifying Device with Injection Stop Control
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Solution Overview
Problem
In direct injection internal combustion engines, existing emission deterioration notification systems often incorrectly notify drivers of exhaust emission deterioration due to low fuel pressure, even when injection stop control is active, leading to unnecessary information and potential driver confusion.
Innovation Solution
An emission deterioration notifying device with a low fuel pressure determining means and an electric control unit that allows notification only during fuel injection and prohibits or reduces threshold values during injection stop control, ensuring accurate notification of exhaust emission deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the warning lamp is lit whenever fuel pressure is below the threshold value, then exhaust emission deterioration is notified, but unnecessary notifications occur during injection stop control causing driver confusion
Solution Approach 1:
The notification system dynamically adjusts its behavior based on the injection control state. The ECU determines whether injection stop control is active and selectively enables or disables the warning lamp notification accordingly. This dynamic adaptation ensures notifications are only displayed when they reflect actual emission deterioration, eliminating false alarms during planned injection stop periods.
Solution Approach 2:
The system changes the notification parameter (warning lamp state) based on the operational context. When injection stop control is detected, the notification parameter is modified to prevent illumination even if fuel pressure is low. This parameter change ensures that the notification system responds appropriately to different operational modes, maintaining reliability while avoiding unnecessary information.
2Loss of information
If the warning lamp notification is prohibited during injection stop control, then unnecessary notifications are reduced, but actual emission deterioration may be missed
Solution Approach 1:
The ECU continuously monitors the injection control state and fuel pressure conditions, using this feedback to make intelligent notification decisions. By detecting the injection stop control state through feedback from the control system, the ECU can distinguish between planned injection stops (where notifications should be suppressed) and abnormal conditions (where notifications should occur), ensuring both reduced false alarms and maintained reliability.
Solution Approach 2:
The notification system dynamically responds to changing operational conditions. Rather than a fixed prohibition, the system adapts its notification behavior based on real-time detection of injection control state and fuel pressure conditions, ensuring that notifications are suppressed only when appropriate while maintaining alertness to actual problems.
Data Source
AI summary
An emission deterioration notifying device includes a low fuel pressure determining unit, an emission deterioration notifying unit, and an electric control unit. The determining unit determines whether supply pressure of fuel supplied to an injector is in a low fuel pressure state, in which the supply pressure is lower than a predetermined threshold value. The notifying unit notifies that exhaust emission is deteriorating beyond its allowable range when it is determined that the supply pressure is in the low fuel pressure state. The control unit allows notification by the notifying unit at a time of injection control at which injection of fuel from the injector is allowed, and the control unit prohibits notification by the notifying unit or reduces the threshold value at a time of injection stop control at which injection of fuel from the injector is stopped.