V-Type Engine Injector Control Using Side-Specific Rail Pressure
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Solution Overview
Problem
Existing methods for controlling V-type internal combustion engines with a common rail system rely on a single high-pressure pump for both sides, which limits precision in determining injection time, especially when dealing with separate common rail systems on each side.
Innovation Solution
The method computes injection time for each side's injector using a shared injector map, with input variables specific to the actual rail pressure of the side being controlled, allowing for precise adaptation and efficient computation without additional hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single high-pressure pump is used for both A-side and B-side rails, then device complexity is reduced and production costs are lowered, but injection time determination precision deteriorates because the same rail pressure prevails in both rails which is not accurate for separate common rail systems
Solution Approach 1:
The patent segments the common rail system into separate A-side and B-side systems, each with its own high-pressure pump and rail pressure sensor. This segmentation allows independent pressure control and accurate injection timing for each side, resolving the precision issue while accepting increased system complexity as necessary for accurate control of V-type engines with separate fuel delivery paths
Solution Approach 2:
The patent applies local quality by using side-specific rail pressure values (A-side actual rail pressure for A-side injectors, B-side actual rail pressure for B-side injectors) in the injector map lookup. This ensures that each injector receives control based on its local pressure conditions, improving injection timing precision for separate common rail systems
2Measurement precision
If separate common rail systems with side-specific pressure control are implemented, then injection time determination precision is improved, but device complexity and production costs increase
Solution Approach 1:
The patent maintains a single universal injector map that can be used for both A-side and B-side injectors. The map is accessed with side-specific pressure values, allowing one control component to serve multiple functions. This reduces production costs by avoiding the need for separate injector maps or additional control hardware for each side
3Adaptability or versatility
If a single injector map is used for both sides with side-specific pressure input, then adaptability is improved and process efficiency is enhanced, but computation complexity increases due to switchable input variables
Solution Approach 1:
The patent implements dynamic switching of the rail pressure input variable based on which side's injector is currently being controlled. The control system dynamically selects between A-side actual rail pressure and B-side actual rail pressure as the input to the injector map, allowing adaptive control for separate common rail systems while using a single static injector map structure
Data Source
AI summary
A method for controlling a V-type internal combustion engine with a separate common rail system on an A side and a separate common rail system on a B side of the internal combustion engine, in which a set injection quantity is computed at least as a function of an actual speed relative to a set speed. An injection time for controlling an A-side injector is computed by an injector map as a function of the set injection quantity and as a function of an A-side actual rail pressure. The injection time for controlling a B-side injector is computed by the same injector map as a function of the set injection quantity and as a function of a B-side actual rail pressure.