Fuel Pressure Sensor Plausibility Check via Idle Actuating Variable
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Solution Overview
Problem
Internal combustion engines face challenges in reliably operating with erroneous fuel pressure sensor measurements, leading to potential pollutant emissions and increased fuel consumption, as existing methods fail to effectively check the plausibility of fuel pressure sensor values.
Innovation Solution
A method and device that regulate the internal combustion engine's rotational speed to a predefined idle speed, determining the required actuating variable for fuel metering, and inferring errors in the fuel pressure sensor measurement by comparing it to a reference value, using a characteristic map to quantify deviations and determine the actual fuel pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel pressure sensor measurement value is used directly for fuel metering control, then the control system operates simply, but the reliability of engine operation deteriorates due to potential erroneous measurements
Solution Approach 1:
The patent implements a feedback mechanism where the control device continuously monitors the actuating variable required to maintain idle rotational speed and compares it against stored reference values. This feedback loop enables automatic detection of fuel pressure sensor errors without requiring additional hardware sensors, thereby improving reliability while maintaining system simplicity.
Solution Approach 2:
The system uses its own operational parameters (actuating variable and rotational speed) to self-diagnose sensor errors. By analyzing the relationship between the actuating variable and rotational speed during idle operation, the system performs self-verification of the fuel pressure sensor without external assistance, resolving the contradiction between reliability and complexity.
2Measurement precision
If no plausibility check is performed on fuel pressure sensor measurements, then the system complexity remains low, but measurement precision deteriorates due to undetected sensor errors
Solution Approach 1:
The patent introduces the actuating variable as an intermediary parameter to indirectly verify the fuel pressure sensor measurement. Instead of directly measuring fuel pressure with additional sensors, the system uses the actuating variable (which controls fuel metering) as a mediator to infer whether the pressure sensor reading is accurate, thereby improving measurement precision without proportionally increasing system complexity.
Solution Approach 2:
The patent replaces potential mechanical measurement systems (additional pressure sensors) with a electronic/control-based verification method. By using the control device to analyze the relationship between actuating variable and rotational speed, the system substitutes complex mechanical measurement infrastructure with a software-based plausibility check, improving measurement precision while minimizing complexity increase.
3Stability of the object's composition
If the actuating variable is continuously adjusted to compensate for sensor errors, then the rotational speed stability improves, but the loss of substance increases due to incorrect fuel metering
Solution Approach 1:
The patent applies preliminary action by detecting and correcting fuel pressure sensor errors before they cause significant deviations in fuel metering and rotational speed. The control device continuously monitors the actuating variable and identifies sensor errors early, allowing for timely correction of the measurement value, thereby maintaining rotational speed stability while minimizing unnecessary fuel consumption adjustments.
Data Source
AI summary
An internal combustion engine has a fuel pressure sensor, the measured value of which represents a fuel pressure in a fuel reservoir of the internal combustion engine. Fuel is metered from the fuel reservoir into a combustion chamber. In a predefined idle operating state (LBZ) of the internal combustion engine, a speed of the internal combustion engine is regulated so as to reach a specific idling speed. During the regulation process, a value of a manipulated variable for metering the fuel is determined, the value being required to reach the specific idling speed. Furthermore, it is concluded that the measured fuel pressure value contains an error (ERR) when the determined required value of the manipulated variable differs from a reference value (REF) predefined for the predefined idle operating state (LBZ) of the internal combustion engine by at least a given amount or factor.