Ford Direct Injection Engine

FORD - FUTURE TECHNOLOGY WATCH

Many of the advanced technologies and significant issues remain to be resolved before implementation. Inhibitors which could delay or preclude implementation might include unproven reliability, vehicle packaging issues and cost .vs. value as perceived by the customer.

Direct Injection Engine

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What it is :

Direct Injection (DI) refers to fuel injected directly into the combustion chamber above the piston. Direct injection has long been used on large diesel engines. Smaller diesels are increasingly adopting direct injection (vs indirect injection into a pre-chamber). Direct injection also can be used in spark ignition (generally gasoline) engines instead of port fuel injection - for cleaner emissions, increased full throttle power and potentially for lean burn operation.

How it works :

With direct injection spark ignition (DISI) engines, fuel in injected in one to two ways depending on operating conditions. Lean burn operating (at part throttle), injects fuel after the air has entered, causing higher fuel concentration near the injector and spark plug for easy ignition. This is known as stratified charge. The oveall air/fuel ratio is lean for better fuel consumption. At full power, fuel is injected at the same time as air (same as for conventional) to promote good mixing. Fuel evaporating in the combustion chamber cools the air slightly for higher volumetric efficiency and power. Since all fuel being injected goes directly into the cylinder, it can be metered more precisely, promoting cleaner emissions.

Customer benefit :

Better fuel efficiency and more power.

Ford Status :

Next generation technology under development