08-02-2013, 10:21 AM
Modern Automotive Technology Fundamentals, service, diagnostics
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Motor vehicle classifications
Single-track vehicles
Motorcycles are single-track vehicles with 2 wheels. A
sidecar may be attached to the motorcycle, which remains
classified as such provided that the tare weight
of the combination does not exceed 400kg. A motorcycle
can also be employed to pull a trailer. Single-track
vehicles include
● Motorcycles. These are equipped with permanent,
fixed-location components (fuel tank, engine) located
adjacent to the knees as well as footrests.
● Motor scooters. Because the operator's feet rest on
a floor panel, there are no fixed components at knee
level on these vehicles.
● Bicycles with auxiliary power plants.These vehicles
exhibit the same salient features as bicycles, such as
pedals (mopeds, motor bicycle, etc.).
Motor vehicle system
The motor vehicle is a complex technical system in
which various subsystems operate in harmony to discharge
a defined function.
The function of the passenger car is to transport
people, while the function of the motor lorry, or truck,
is to carry cargo.
Operational units within the motor vehicle
Systems designed to support operational processes
are combined in operational units (Fig. 1). Familiarity
with the processes performed in operational units such
as the engine, drivetrain, etc. can enhance our under-
standing of the complete system represented by the
motor vehicle in its implications for maintenance, diagnosis
and repair.
The concept is suitable for application with any technical
system. Among the operational units that comprise
the motor vehicle are the:
● Power unit
● Power-transfer assembly
● Support and load-bearing structure
● Electro-hydraulic systems
(open and closed-loop systems, etc.)
● Electrical and electronic systems
(such as safety devices)
New service concepts
The service date is calculated on the basis of data collected
on the actual condition of wearing parts, fluids
and lubricants, as well as information on the vehicle's
operating conditions. When defined by this demandbased
service concept, service and maintenance are
carried out only when needed, for instance, when a
component reaches its wear limit, or a fluid or lubricant
has reached the end of its service life.