System for controlling air supply pressure in a pneumatic direct

Details System for controlling air supply pressure in a pneumatic direct System for controlling air supply pressure in a pneumatic direct

1991-12-16

1992-09-29

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary air or gas used to inject fuel

123494, F02M 2300

Patent

active

051506920

ABSTRACT:
A system is disclosed for controlling the pressure in a pressurized air supply for an internal combustion engine having pneumatic direct fuel injection, wherein pressurized air from the supply is utilized to inject fuel held within a fuel injector directly into an engine cylinder, against opposing cylinder compression pressure, while the injector is opened during a cylinder injection period in the engine cycle. The system adjusts the duration of the cylinder fuel injection period in accordance with the sensed pressure in the air supply to maintain the air supply pressure above cylinder compression pressure during the injection period, thereby preventing the backflow of fuel through the cylinder fuel injector into the air supply.

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