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7 DIGITAL ENGINE CONTROL SYSTEM
Quiz for Chapter 7
1. A typical fuel control system 6. A low air/fuel ratio is what type
may include the following of fuel mixture?
components a. lean
a. MAF sensor b. rich
b. fuel injector c. poor
c. EGO sensor d. fat
d. all of the above
7. Open- and closed-loop fuel
2. A fuel control system control systems control air/fuel
a. has many operating modes ratio near which of the following?
b. is never operated in open- a. rich
loop mode b. lean
c. does not control air/fuel ratio c. stoichiometry
during warm-up d. rich and lean
d. none of the above
8. Acceleration enrichment is used
3. During hard deceleration the for what purpose?
engine requires a. reduce fuel consumption
a. very rich mixture b. reduce exhaust emissions
b. very lean mixture c. provide maximum torque
c. stoichiometric mixture d. provide minimum fuel
d. none of the above economy
4. Electronic control system for 9. Idle speed control is used for what
ignition can perform reason?
a. timing for maximum a. maximum idle speed
torque b. minimum idle fuel
b. correct timing calculation consumption
with respect to RPM c. deceleration leaning
c. correct timing calculation d. maintaining desired idle
with respect to MAP speeds
d. all of the above
10. Under closed-loop ignition
5. The controller discussed in timing control, spark advance is
this chapter is what type of limited by
controller? a. the distributor rotation
a. analog b. knock
b. digital c. MBT
c. both analog and digital d. coolant temperature
258 UNDERSTANDING AUTOMOTIVE ELECTRONICS
