Supercharged Off-Road Engine Intake Layout for Knock Prevention
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Solution Overview
Problem
In off-road vehicles equipped with a supercharger, the high temperature of intake air can lead to knocking in engines, and the use of an intake air manifold can cause mutual interference between intake airs, restricting valve motions.
Innovation Solution
The configuration includes an internal combustion engine, a supercharger, an intercooler, an intake tank, a throttle body, and multiple injectors. The intake tank defines an intake chamber, and the throttle body has multiple intake conduits and throttle valves connected to each cylinder. This setup eliminates the use of an intake air manifold, reducing mutual interference and allowing for effective knocking prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an intake air manifold is used to distribute intake air to multiple cylinders, then the structure is simplified, but mutual interference occurs between intake airs which restricts valve motions
Solution Approach 1:
The patent divides the intake system into separate individual intake conduits for each cylinder, eliminating the shared intake air manifold. Each cylinder has its own dedicated intake path from the throttle body, which prevents mutual interference between intake airs while maintaining simplified structure through direct routing.
2Temperature
If fuel is injected into the intake air manifold to cool the intake air, then knocking is prevented, but mutual interference between intake airs occurs which restricts valve motions
Solution Approach 1:
The patent segments the fuel injection system so that each individual intake conduit has its own fuel injector positioned within it. This allows cooling fuel to be injected into each separate intake air stream without causing mutual interference, as each conduit operates independently. The segmented approach maintains both cooling effectiveness and proper valve motion.
3Temperature
If the intake air temperature is decreased for knocking prevention, then engine knocking is reduced, but the intercooler alone is insufficient without proper fuel injection positioning
Solution Approach 1:
The patent uses the individual intake conduits as intermediaries to deliver cooling fuel directly to each cylinder's intake air stream. The conduits act as channels that facilitate heat transfer from the intake air to the injected fuel, enhancing the cooling effect. This intermediary approach ensures reliable knocking prevention by positioning the fuel injection exactly where it is most effective.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration minimizes mutual interference between intake airs, ensuring smooth valve operations while effectively preventing knocking in the engine, thus enhancing the performance and reliability of the off-road vehicle.
Implementation Method 1
an intercooler, provided at an intake conduit provided between the supercharger and the internal combustion engine
Implementation Method 2
the fuel injected from the second injector is vaporized to promote decrease of the intake air temperature
Implementation Method 3
The plurality of throttle valves are respectively provided in the plurality of intake conduits
Data Source
AI summary
An off-road vehicle includes an internal combustion engine, a supercharger, an intercooler, an intake tank, a throttle body, first injectors, and at least one second injector. The engine includes cylinders. The supercharger supplies intake air to the engine. The intercooler is provided at an intake conduit provided between the supercharger and the engine. The intake tank is provided at the intake conduit and defines an intake chamber inside the intake tank. The throttle body is provided at the intake conduit, and includes intake conduits and throttle valves. The intake conduits are respectively connected to intake ports of the cylinders. The throttle valves are respectively provided in the intake conduits. The plurality of first injectors are provided at the throttle body and inject fuel to the respective intake conduits. The at least one second injector is provided at the intake tank and injects fuel to the intake chamber.