Engine Injector Fault Detection Isolating Air Compressor Torque
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Solution Overview
Problem
Existing methods for determining injector failure in vehicle engines are influenced by the air compressor, leading to erroneous results due to the compressor's effect on crankshaft angular velocity, which can cause incorrect identification of injector malfunctions.
Innovation Solution
An engine control method and apparatus that uses a crankshaft position sensor and a controller to measure angular velocity variations between cylinders, applying the air compressor's driving torque at specific times to minimize its influence on injector failure detection, and calculates a correction amount for fuel injection based on these variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air compressor is driven by the engine, then compressed air is generated for brake and air systems, but the compressor load affects the crankshaft angular velocity and causes erroneous injector failure detection
Solution Approach 1:
The patent extracts and isolates the harmful influence of the air compressor by identifying specific crankshaft rotation sections where the compressor does not operate. By measuring angular velocity only in these excluded sections, the harmful factor (compressor load) is effectively removed from the measurement process, enabling accurate injector failure detection without interference.
Solution Approach 2:
The patent applies preliminary action by pre-identifying and excluding the crankshaft rotation sections where the air compressor operates before performing the angular velocity measurement. The controller is configured to measure angular velocity only in sections that are predetermined to be free from compressor influence, thus preparing the measurement conditions in advance to avoid erroneous detection.
2Measurement precision
If angular velocity measurement is performed in all crankshaft rotation sections, then comprehensive data is obtained, but measurements during compressor operation yield erroneous results
Solution Approach 1:
The patent segments the crankshaft rotation into distinct sections: sections where the air compressor operates and sections where it does not. By dividing the measurement domain into these segments, the patent enables precise measurement in the appropriate segments while ignoring the harmful segments, thus improving measurement accuracy without requiring complex intervention.
Data Source
AI summary
An engine control apparatus and method in which when an injector malfunction is determined based on a difference in variation of angular velocity of a crankshaft between a plurality of cylinders of a vehicle engine, determining whether the injector malfunctions by avoiding the time when the driving torque of an air compressor is applied or at the time when the influence thereof is reduced, thereby preventing the erroneous determination of whether the injector malfunctions from occurring due to the driving torque of the air compressor connected to the vehicle engine.