Page 389 - Understanding Automotive Electronics

2735 | CH 11 Page 376 Tuesday, March 10, 1998 1:30 PM

11 FUTURE AUTOMOTIVE ELECTRONIC SYSTEMS

Figure 11.7
Functional
Operation of
Lambda Sensor

FPO

Alternative Engine
The engine that has been discussed in detail throughout this book is a 4-
stroke/cycle, gasoline-fueled, spark-ignited (SI) engine (see Chapter 1). An
alternative gasoline engine is the 2-stroke/cycle engine. This type of engine has
been used for many years as a small marine engine, as motorcycle and
lawnmower engines, and briefly as a passenger car engine. Unlike the 4-stroke/
cycle engine, which requires two complete crankshaft revolutions for each
power stroke, the 2-stroke/cycle engine delivers power during each crankshaft
revolution. This engine has the potential to be more compact and lightweight
for a given power output and to require fewer parts than a comparable 4-stroke/
cycle engine. Great potential fuel economy benefits can be achieved using this
engine compared with a 4-stroke/cycle engine due to reduced vehicle weight
and improved vehicle shape for drag reduction.

376 UNDERSTANDING AUTOMOTIVE ELECTRONICS