Dual Injectors to Boost Fuel Economy

--The Future of Small Engines?

Product Details

Language
English
Format
PDF
File Size
0.68MB
Print Length
16 Pages
Publisher
Nikkei Business Publications,Inc.
Published
June 2014
Delivery
Immedate Download

Sample PDF

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Report Description

Nissan's dual injectors, Honda's twin injection, Suzuki's dual jet... regardless of the name used by each company, more and more gasoline engines are being built with two injectors per cylinder.

Suzuki adopted a dual-injector design in the Swift in July 2013, followed by Honda in its N-WGN in November of the same year. Nissan started even earlier, though, putting two injectors on its Juke design from 2010. And now all three offer the technology.

Some people have suggested that future engines will all be direct injection designs, but in fact dual injectors delivers better fuel economy than direct injection in low-displacement engines. The technology seems likely to establish a place for itself as a viable engine design choice. Fuel droplets from the injectors travel through the port, and there are two ways they can enter the combustion chamber: ride in on the air current as droplets, or hit the port wall and slide in along it as a film. Automobile manufacturers are adopting dual-injector engines so that they can use the former approach – droplets – with even smaller drops than ever before.

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Table of contents

Dual-injector engines are on the market

Control evaporation heat to control combustion

Constant air/fuel ratio for uniformity

Positioning each injector ideally

Injection up close

More tiny apertures

Misting injector

Coexistence with direct-injection engines

Figures:

Fig. 1 Head cross-section of Nissan's dual-injector engine
Fig. 2 Suzuki's Swift
Fig. 3 Honda's N-WGN
Fig. 4 Suzuki's Solio
Fig. 5 Honda's N-BOX
Fig. 6 The Nissan AD also has dual injectors
Fig. 7 Brake Specific Fuel Consumption (BSFC) for Swift engine
Fig. 8 Fuel concentration distribution analysis by Honda
Fig. 9 Fuel concentration distribution analysis by Suzuki
Fig. 10 A/F probability distribution for cylinder interior
Fig. 11 Nissan's injector
Fig. 12 Combustion spread within the port
Fig. 13 Suzuki's dual-injector design
Fig. 14 Nozzle plate front and side views (Nissan)
Fig. 15 Photos of fuel injection spray
Fig. 16 Honda's swirl injector
Fig. 17 Honda assigned priority to reducing fuel adhesion on walls, especially at branch
Fig. 18 Suzuki's injector roadmap

Sample PDF

This product includes the 10 report set. For the 10 report set, please click here.

Clicking here will take you to the outside partner sales site.