Vehicle Catalyst Diagnosis Control via Deceleration Rate Assessment
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Solution Overview
Problem
Existing vehicle control systems face challenges in executing catalyst deterioration diagnosis at appropriate timings due to interruptions caused by driver operations, leading to potential repeated executions and increased fuel injection, which can disrupt the diagnosis and reduce regenerative electric power.
Innovation Solution
A vehicle control apparatus that includes a catalyst deterioration diagnosing unit, an engine controlling unit, and a diagnosis start determining unit, which controls the air-fuel ratio to lean and rich sides during diagnosis and prohibits diagnosis execution during high deceleration rates, allowing it only when deceleration is low without braking operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalyst deterioration diagnosis is executed during vehicle deceleration, then diagnosis can be performed, but driver operations may interrupt the diagnosis causing repeated executions and increased fuel injection
Solution Approach 1:
The system performs preliminary assessment of deceleration rate before initiating catalyst deterioration diagnosis. By evaluating the deceleration rate in advance and selecting appropriate timing, the system prevents interruptions caused by driver operations, thereby avoiding repeated diagnosis executions and excessive fuel injection.
2Loss of time
If catalyst deterioration diagnosis is executed during high deceleration, then diagnosis timing is available, but driver operations interrupt the diagnosis and reduce regenerative electric power
Solution Approach 1:
The system performs preliminary assessment of deceleration rate before initiating catalyst deterioration diagnosis. By evaluating the deceleration rate in advance and selecting appropriate timing, the system prevents interruptions caused by driver operations, thereby avoiding repeated diagnosis executions and excessive fuel injection.
3Measurement precision
If air-fuel ratio is controlled to lean side and then rich side during diagnosis, then catalyst deterioration can be detected, but engine speed may fluctuate during high deceleration
Solution Approach 1:
The system performs preliminary assessment of deceleration rate before initiating catalyst deterioration diagnosis. By evaluating the deceleration rate in advance and selecting appropriate timing, the system prevents interruptions caused by driver operations, thereby avoiding repeated diagnosis executions and excessive fuel injection.
Data Source
AI summary
A vehicle control apparatus for a vehicle includes a catalyst deterioration diagnosing unit, an engine controlling unit, and a diagnosis start determining unit. The catalyst deterioration diagnosing unit executes a deterioration diagnosis of a catalyst included in an exhaust system of an engine provided in the vehicle. The engine controlling unit controls an air-fuel ratio of the engine to a lean side and thereafter to a rich side during the deterioration diagnosis of the catalyst. The diagnosis start determining unit prohibits the deterioration diagnosis of the catalyst from being executed when a deceleration rate upon deceleration of the vehicle is high, and permits the deterioration diagnosis of the catalyst to be executed when the deceleration rate upon deceleration of the vehicle is low.