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Computerized
Engine Control
 By
the early 1980s, numerous vehicles were using electronics and onboard computers
to control many of the engine’s systems, such as fuel and ignition. Vehicle manufacturers
had to develop ways to diagnose problems generated by the new electronic hardware
found under the hood. Thus, the first OBD systems were developed by auto manufacturers
as electronic systems replaced mechanical systems. The engines in today’s vehicles
are mostly controlled by electronics. Sensors and actuators sense the operation
of specific components (e.g., the oxygen sensor) and actuate others (e.g., the
fuel injectors) to maintain optimal engine control. An onboard computer, known
sometimes as a "power train control module" or an "engine control unit," controls
all of these systems. With proper computer software, the onboard computer is
capable of monitoring all of the sensors and actuators to determine whether they
are working as intended. It can detect a malfunction or deterioration, usually
before the driver becomes aware of the problem through a loss in vehicle performance
or drive ability. The sensors and actuators, along with the diagnostic computer
software in the onboard computer, make up what is called "the OBD system." Dallas
Auto Sports trained technicians, equipped with the newest diagnostic and repair
equipment, can conduct OBD related service. |
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