Dual Fuel Injector Packaging in Overhead Valve Engines
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Solution Overview
Problem
In overhead valve engine assemblies, it is challenging to incorporate both direct fuel injectors and port fuel injectors due to packaging constraints, particularly with pushrods positioned on opposite sides of intake ports, which hinders simultaneous placement on the intake side of the cylinder head.
Innovation Solution
The engine assembly positions direct fuel injectors on the intake side and port fuel injectors on the exhaust side of the cylinder head, allowing both types of injectors to be integrated by angling them obliquely relative to the piston axis and utilizing separate fuel rails closer to their respective sides, enabling efficient fuel injection into combustion chambers and intake ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both direct fuel injectors and port fuel injectors are placed on the intake side of the cylinder head, then fuel injection functionality is improved, but packaging constraints due to pushrods on opposite sides of intake ports prevent simultaneous placement
Solution Approach 1:
The patent resolves the packaging constraint by moving the port fuel injector from the traditional intake side location to the exhaust side of the cylinder head. This spatial reconfiguration in another dimension (from intake side to exhaust side) allows both direct fuel injectors and port fuel injectors to coexist without interfering with the pushrod arrangement, while maintaining dual fuel injection functionality.
2Device complexity
If port fuel injectors are positioned on the exhaust side of the cylinder head, then packaging constraints are resolved, but fuel injection into intake ports upstream of intake valve becomes more challenging
Solution Approach 1:
The patent employs asymmetric positioning of the port fuel injector on the exhaust side of the cylinder head, angled obliquely relative to the piston axis. This asymmetric configuration allows the injector to reach across and inject fuel into the intake port upstream of the intake valve, overcoming the positional challenge while maintaining packaging efficiency.
3Use of energy by moving object
If direct fuel injectors and port fuel injectors are both incorporated into the engine assembly, then fuel economy is enhanced, but space availability on the intake side is reduced
Solution Approach 1:
The patent segments the fuel injection system into two distinct components: direct fuel injectors positioned on the intake side for direct combustion chamber injection, and port fuel injectors positioned on the exhaust side for intake port injection. This segmentation allows each injector type to occupy separate spatial zones, preserving space availability while achieving enhanced fuel economy through dual injection modes.
Data Source
AI summary
An engine assembly includes a cylinder head having an intake side and an exhaust side opposite the intake side. The cylinder head has an intake port, an exhaust port, and a combustion chamber in fluid communication with the intake port and the exhaust port. The engine assembly further includes a port fuel injector coupled to the cylinder head. The port fuel injector is disposed closer to the exhaust side than to the intake side of the cylinder head. Further, the port fuel injector is fluid communication with the intake port to allow fuel to be injected directly into the intake port. The engine assembly further includes a direct fuel injector coupled to the cylinder head. The direct injector is in fluid communication with the combustion chamber to allow fuel to be injected directly into the combustion chamber.