| 摘要 |
The invention includes means (40c, 40d) for pneumatically amplifying sensed air flow pressure differential (PD) through an air intake venturi (32) between a first air pressure sensor (50) outside the venturi and a second pressure sensor (46) in the venturi. Pressure at the inner end (45) of the second pressure sensor (46) is reduced by altering the air path (28c, 28d) creating a vacuum at that point (45). A throttle plate (40) in the venturi (32) has a by-pass hole (40c, 40d) therethrough, creating a vacuum by pulling air out of the inner end (45) of the sensor tube (46), to reduce pressure thereat. This maintains a sufficient sensed pressure differential (PD) between the outside of the venturi and the inside of it, and amplifies said differential to provide improved tracking of fuel flow requirements between prescribed lean limit (LL, Figs. 20-22) and rich limit (RL) requirements, at idle and low speed. |
