Hybrid Vehicle Throttle Bore Diagnostics for Sludge Detection
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Solution Overview
Problem
In hybrid vehicles, sludge accumulation in the throttle bore reduces air flow, making it difficult to diagnose due to limited time at closed throttle positions, which can lead to engine misfires or stalling, especially at low throttle angles.
Innovation Solution
A method is introduced to perform closed-in-bore diagnostics by initiating a diagnostic sequence when specific conditions are met, such as a fully closed driveline disconnect clutch, low vehicle speed, and low torque demands, allowing for precise control of engine speed and air flow without disturbing vehicle operation, enabling detection of sludge without intrusive engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If closed-in-bore diagnostics are performed by intrusively operating the engine, then sludge detection accuracy is improved, but vehicle operation is disturbed
Solution Approach 1:
The system performs closed-in-bore diagnostics during predetermined operating conditions (low vehicle speed, low torque demand, specific throttle angle ranges) before sludge accumulation significantly impacts engine performance. By detecting sludge early under controlled conditions, the system maintains detection accuracy while avoiding intrusive operations that would disturb normal vehicle operation.
Solution Approach 2:
The diagnostic system dynamically adjusts throttle angle targets based on detected engine parameters and operating conditions. The controller modifies the closed-in-bore diagnostic throttle angle dynamically to optimize sludge detection while maintaining smooth vehicle operation, allowing the system to adapt to changing conditions without intrusive engine operation.
2Use of energy by moving object
If the throttle is kept closed for extended periods to improve efficiency, then fuel efficiency is improved, but sludge accumulation in the throttle bore increases
Solution Approach 1:
The system implements periodic closed-in-bore diagnostics during normal low-speed operation without requiring extended throttle closure. By performing brief diagnostic cycles at predetermined intervals during low vehicle speed and low torque demand conditions, the system detects sludge accumulation early while maintaining fuel efficiency, avoiding the need for prolonged throttle closure that would worsen sludge buildup.
3Speed
If closed-in-bore diagnostics are performed at high vehicle speed, then diagnostic speed is improved, but engine air flow increases making sludge detection difficult
Solution Approach 1:
The system changes operating parameters by selecting specific vehicle speed ranges (low vehicle speed conditions) and throttle angle ranges for closed-in-bore diagnostics. By operating at lower air flow conditions with reduced vehicle speed and specific torque demand levels, the system creates optimal conditions for detecting sludge-induced air flow restrictions while maintaining reasonable diagnostic speed through efficient control algorithms.
Data Source
AI summary
Systems and methods for performing closed-in-bore diagnostics for a hybrid vehicle are presented. In one example, select operating conditions may be evaluated before closed-in-bore diagnostics may be initiated. In addition, charging of one or more batteries may be reduced to ensure that an engine throttle may operate with a small opening amount to evaluate the presence or absence of sludge in the engine throttle.