05-9
Section 05
DIGITAL PERFORMANCE MANAGEMENT (DPM) SYSTEM
Enrichment Solenoid
Solenoid Operating Principle
A solenoid is a winding coiled in order to produce
a magnetic field. A metal rod crosses the coil and
cuts the magnetic field. Each time the coil is acti-
vated, the magnetic field attracts the rod. If the
supply current is interrupted, a spring pushes the
rod.
Solenoid Function within the DPM System
The DPM module turns the solenoid on and off 10
times per second, which means that it operates at
10 cycles/second or 10 Hertz (Hz). The solenoid
therefore opens and closes 10 times per second,
thus allowing the pump pressure to reach the dis-
tribution gallery (upper tube).
For the pressure to vary within the bowls, the so-
lenoid is activated in part by the DPM during each
cycle. This is what is called the duty cycle. In other
words, the solenoid will not open throughout the
whole cycle. The duty cycle depends on the en-
gine temperature.
The colder the engine, the longer the duty cycle.
Therefore, the solenoid will stay open longer, thus
giving way to pressure.
1. Engine temperature sensor
Compensation Solenoid
NOTE:
Read
Operating Principle of a Solenoid at
the beginning of the chapter concerning the en-
richment solenoid.
The DPM module turns the solenoid on and off 10
times per second, which means that it operates at
10 cycles/second or 10 Hertz (Hz). The solenoid
therefore opens and closes 10 times per second,
thus allowing the pump pressure to reach the dis-
tribution gallery (upper tube).
For the vacuum to vary within the bowls, the so-
lenoid is activated in part by the DPM module dur-
ing each cycle. This is what is called the duty
cycle. In other words, the solenoid will not open
throughout the whole cycle. The duty cycle de-
pends on the air temperature and the atmospher-
ic pressure.
The warmer the air, the longer the duty cycle.
Therefore, the solenoid will stay open longer, thus
giving way to vacuum. The same applies when
the altitude increases.
A06I0SA
A06E2QA
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Summary of Contents for FORMULA S 1997
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