Vehicle Control for Catalyst Odor and Degradation
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Solution Overview
Problem
Existing vehicle control systems face challenges in smoothly transitioning from catalyst odor suppression to catalyst degradation suppression, often resulting in inefficiencies due to delays in adjusting air amounts during engine idling.
Innovation Solution
A vehicle control method that prioritizes catalyst odor suppression by setting the required air amount for idling based on the vehicle's operating state, adjusting air amounts, and controlling fuel injection to perform a fuel cut, ensuring the air amount is adequate for idling when shifting to suppress catalyst degradation, thereby eliminating delays in air adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If control to suppress catalyst odor is performed by fuel cut, then catalyst odor is suppressed, but the transition to catalyst degradation suppression control becomes delayed due to throttle valve adjustment time
Solution Approach 1:
The control apparatus pre-adjusts the throttle valve opening amount during fuel cut control to suppress catalyst odor, preparing the air intake system in advance. When transitioning to catalyst degradation suppression control, the throttle valve is already positioned to provide the required air amount, eliminating adjustment delay and enabling immediate transition to the next control mode.
2Object-affected harmful factors
If fuel cut is performed to suppress catalyst odor, then sulfur buildup in catalyst is reduced, but engine idling stability becomes difficult to maintain without throttle adjustment
Solution Approach 1:
The control apparatus adjusts the throttle valve opening amount in advance during fuel cut control to establish proper air intake conditions. This pre-adjustment ensures that when fuel injection resumes and the engine transitions to idling, the throttle valve is already positioned to provide stable combustion conditions, maintaining engine idling stability without delay.
Solution Approach 2:
The control apparatus monitors engine operating conditions and dynamically adjusts the throttle valve opening amount based on feedback from sensors. This closed-loop control ensures that the air intake amount is continuously optimized to maintain stable engine idling while suppressing catalyst odor through fuel cut control.
Data Source
AI summary
When both catalyst degradation and catalyst odor need to be suppressed when a fuel cut condition is satisfied, a fuel cut control is executed giving priority to control for suppressing catalyst odor, though a required air amount G* for idling is drawn in at that time. Therefore, when shifting the engine into an idle state to suppress catalyst degradation after the catalyst odor has been eliminated, the required air amount G* for idling is already being drawn in so there is no need to adjust the air amount. As a result, there is no time delay for air amount adjustment. Therefore, after the control to suppress catalyst odor has ended, a smooth shift can be made into control to suppress degradation of the exhaust gas control catalyst.