Fuel Delivery Regulation Without Pressure Sensor
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Solution Overview
Problem
Existing methods for regulating fuel delivery systems without pressure sensors often result in inaccurate pressure determination and inefficient operation, especially across different vehicle operating states, leading to potential engine performance issues.
Innovation Solution
A method that employs multiple submethods, including characteristic map-based, current-controlled, and volume-controlled approaches, where control variables are evaluated for plausibility and used to actuate the electric motor, ensuring accurate pressure determination and regulation by combining and weighting variables from different submethods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single submethod is used for ascertaining pressure without a pressure sensor, then the construction remains simple, but the measurement precision deteriorates in certain operating ranges
Solution Approach 1:
The pressure determination method is segmented into multiple submethods, each optimized for specific operating ranges. The evaluation unit selectively executes relevant submethods based on current operating conditions, ensuring high measurement precision without requiring a dedicated pressure sensor across all operating states.
Solution Approach 2:
The system dynamically adapts by selecting and executing different submethods based on real-time operating conditions. The evaluation unit determines which submethod is appropriate for the current state, allowing the system to maintain high measurement precision across varying operating ranges while keeping the overall construction simple.
2Device complexity
If a single submethod is used for fuel delivery regulation, then the control logic is simple, but the reliability deteriorates across different operating states
Solution Approach 1:
The control logic is segmented into multiple submethods, each tailored to specific operating states. The evaluation unit selects the appropriate submethod based on current conditions, ensuring reliable fuel delivery regulation across all operating states while maintaining manageable control logic complexity.
Solution Approach 2:
The evaluation unit serves multiple functions by selecting and executing different submethods based on operating conditions. This multi-functional approach ensures reliable operation across all states without requiring separate control systems for each operating range.
3Device complexity
If characteristic map-based method is used, then the pressure can be ascertained without pressure sensor, but the measurement precision deteriorates in severe operating conditions
Solution Approach 1:
The characteristic map-based method is segmented into multiple specialized submethods, each optimized for specific operating conditions. The evaluation unit selects the most appropriate submethod for current conditions, maintaining high pressure determination accuracy across all operating states without requiring additional pressure sensors.
Solution Approach 2:
The system changes operational parameters by selecting different submethods with different characteristics based on operating conditions. This allows the system to adapt to severe operating conditions by using submethods specifically suited for those conditions, maintaining measurement precision without adding sensors.
Data Source
AI summary
A method for regulating a fuel delivery system without a pressure sensor. The fuel delivery system has a fuel delivery pump, an electric motor, and an evaluation unit. The fuel delivery pump is driven by the electric motor, which is actuated using control variables such that a prespecifiable fuel delivery is achieved. At least two different submethods are executed for ascertaining control variables, which are ascertained in the respective submethod and are supplied to an evaluation unit. The control variables are evaluated regarding their plausibility in the evaluation unit and the electric motor is actuated based on the ascertained control variables from only one or a plurality of submethods.