Pulse-Width Limits; Figure 3-13 Injector Opening And Closing Response - Delphi Multec 3.5 Applications Manual

Multec 3.5 Fuel Injector Application Manual

Pulse-Width Limits

3.9
Opening Response
Open - 95
Closed - 0
Logic On
Logic Off
0 0.5
Delphi Energy and Chassis Systems
Fuel delivery becomes unpredictable at high duty cycles (>95%) and very
low pulse-widths due to unstable opening and closing times.
Opening response (O.R.) is the time it takes the magnetic circuit to build
up sufficient force to overcome loads from the fuel pressure and valve
spring on the injector valve and move it from the fully closed position to
the fully open position.
Closing response (C.R.) is the time it takes for the magnetic circuit to
decay to a level at which the loads from the valve spring and fuel pressure
can move the valve from the fully open position to the fully closed
position.
Closing Response
Pulse Width
(2ms)
1 1.5 2 2.5

Figure 3-13 Injector Opening and Closing Response

Inertial forces must be considered when determining opening response and
closing response. Other factors that contribute to injector opening and
closing responses include:
Period (5 ms)
3 3.5 4 4.5
Time (ms)
Product Description
5 5.5 6 6.5
Revision: 11/05-1 3-27
7