Fuel Rail Pressure Sensor Accuracy Correction
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Solution Overview
Problem
Inaccuracies in fuel rail pressure sensors can lead to improper fueling in internal combustion engines, particularly when the pressure within the fuel rail is below a predetermined level, such as 2 Mega Pascal, causing potential engine performance issues and requiring remedial actions to correct the fueling system.
Innovation Solution
A system and method that selectively disables the high pressure fuel pump, compares measurements from multiple pressure sensors, and adjusts their readings based on a feed pressure sensor for accuracy, determining pressure adjustments to correct for inaccuracy in the fuel rail pressure sensors, and generates adjusted fuel rail pressures to ensure proper engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fuel rail pressure sensor measurements are used directly for fueling control, then the system operation is simple, but measurement accuracy deteriorates when pressure is below 2 MPa
Solution Approach 1:
The system performs preliminary action by disabling the fuel pump before taking pressure measurements. This creates a known reference state where the measured pressure should match the feed pressure, allowing the system to pre-determine accuracy adjustments before normal operation resumes. The pump is disabled for a predetermined period to ensure pressure equilibrium is reached.
Solution Approach 2:
The system implements feedback by continuously comparing the fuel rail pressure sensor measurements with feed pressure sensor measurements during pump-disabled periods. The determined pressure adjustments are fed back into the fueling control system to correct future measurements, creating a closed-loop correction mechanism that improves measurement accuracy over time.
2Measurement precision
If the fuel pump is disabled to correct sensor inaccuracy, then measurement accuracy improves, but engine productivity decreases during the correction period
Solution Approach 1:
The system applies periodic action by disabling the fuel pump at specific intervals rather than continuously. The pump operates normally during most of the time and is temporarily disabled only during predetermined periods when accuracy corrections are needed. This periodic disabling minimizes impact on overall engine productivity while still achieving measurement correction.
Solution Approach 2:
The system uses partial action by disabling the fuel pump only for the minimum necessary duration required to obtain accurate pressure measurements and determine corrections. The pump is not disabled excessively long, and the correction process is designed to be completed within a predetermined period, thus limiting the impact on engine productivity while achieving the necessary measurement accuracy.
3Measurement precision
If pressure adjustments are determined after a predetermined period following pump disablement, then measurement accuracy improves, but response time increases
Solution Approach 1:
The system performs preliminary determination of pressure adjustments during the pump-disabled period. By preparing the correction values in advance while the pump is disabled, the system has corrections ready before normal operation resumes, reducing the actual time delay when the corrected values are applied to fueling control.
Data Source
AI summary
A system for a vehicle includes a pump control module, an adjustment determination module, and an adjusting module. The pump control module selectively disables pumping of a fuel pump that is driven by a spark ignition direct injection (SIDI) engine. A predetermined period after the pumping of the fuel pump is disabled, the adjustment determination module determines a pressure adjustment for a first fuel rail pressure measured using a fuel rail pressure sensor. The adjusting module generates a second fuel rail pressure based on the pressure adjustment and the first fuel rail pressure.