Mechanical air-fuel control for feedback control of external dev

Details Mechanical air-fuel control for feedback control of external dev Mechanical air-fuel control for feedback control of external dev

1994-06-10

1996-11-12

Miller, Carl S.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123373, F02D 3100

Patent

active

055729720

ABSTRACT:
A control system for a diesel engine for creating an ON/OFF feedback signal for controlling engine-related functions includes a mechanical assembly involving a fuel injection pump, a governor for the fuel injection pump, a pair of cam stops as part of the governor and an electrically grounded moveable rack finger. One of the cam stops is a fixed stop which limits travel of the rack finger and thus limits fueling to a predetermined level. The only variable which determines fuel quantity for this full load cam stop is engine speed. The second stop which limits rack finger travel is an air-fuel cam stop which has two independent variables that determine the fuel limit. These independent variables are engine speed and engine boost pressure. The air-fuel cam stop is placed within a housing which is electrically isolated from the rest of the fuel pump and the engine. Once there is contact between the moveable rack finger and the air-fuel cain an electrical signal (ON) is created which may be used to activate or energize other engine-related functions such as shutting off EGR during air limited operation.

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