CH26 ONBOARD VEHICLE NETWORKS
EXAM QUESTIONS AND ANSWERS!
, Onboard vehicle networks are formed by - ANSWER Connecting vehicle electronic
control modules to one another to communicate and exchange information.
Communication takes place between all the modules and devices connected to the
network using - ANSWER An electrical signal-processing strategy called multiplexing
(MUX).
Onboard networks can be categorized by - ANSWER Typology, their physical layer,
their network protocol, or by whether they have centralized or distributed control.
Networks are formed based on organizational priorities, with modules grouped by -
ANSWER Area or function, such as those involved in engine, transmission, ABS,
climate control, instrumentation, entertainment devices, or body electrical control.
The type of multiplexing used in onboard networks works by - ANSWER dividing the
time available to each network module or device to transmit and listen to information.
Only one module is allowed to talk, and all other modules must listen until it is their turn
to talk.
Advantages of multiplexing include - ANSWER Simplified software control of the
electrical system, to enable onboard diagnostics, ease of connecting electronically
controlled accessories and features, and reduction in number of sensors.
Controlled area networks are the most - ANSWER Widely used type of network for
integrating power train operation (PTO) of all the latest vehicles.
Two different types of CANs used by on-highway trucks, buses, and highway equipment
are - ANSWER The SAE network standards of J-1939 and j-1587/1708.
In serial communication, one wire, called CAN-HI, has a more - ANSWER Positive
voltage than the other, which is CAN-LO. Each wire has a mirror opposite charge of the
other when communication takes place.
Wires are twisted to - ANSWER Minimize electromagnetic interference caused by
magnetic fields and radio waves. To further minimize signal distortion, at each end of
the J-1939 CANBus there is a 120-ohm resistor that extinguishes multiplex voltage
signals to prevent their reflection through the data bus.
EXAM QUESTIONS AND ANSWERS!
, Onboard vehicle networks are formed by - ANSWER Connecting vehicle electronic
control modules to one another to communicate and exchange information.
Communication takes place between all the modules and devices connected to the
network using - ANSWER An electrical signal-processing strategy called multiplexing
(MUX).
Onboard networks can be categorized by - ANSWER Typology, their physical layer,
their network protocol, or by whether they have centralized or distributed control.
Networks are formed based on organizational priorities, with modules grouped by -
ANSWER Area or function, such as those involved in engine, transmission, ABS,
climate control, instrumentation, entertainment devices, or body electrical control.
The type of multiplexing used in onboard networks works by - ANSWER dividing the
time available to each network module or device to transmit and listen to information.
Only one module is allowed to talk, and all other modules must listen until it is their turn
to talk.
Advantages of multiplexing include - ANSWER Simplified software control of the
electrical system, to enable onboard diagnostics, ease of connecting electronically
controlled accessories and features, and reduction in number of sensors.
Controlled area networks are the most - ANSWER Widely used type of network for
integrating power train operation (PTO) of all the latest vehicles.
Two different types of CANs used by on-highway trucks, buses, and highway equipment
are - ANSWER The SAE network standards of J-1939 and j-1587/1708.
In serial communication, one wire, called CAN-HI, has a more - ANSWER Positive
voltage than the other, which is CAN-LO. Each wire has a mirror opposite charge of the
other when communication takes place.
Wires are twisted to - ANSWER Minimize electromagnetic interference caused by
magnetic fields and radio waves. To further minimize signal distortion, at each end of
the J-1939 CANBus there is a 120-ohm resistor that extinguishes multiplex voltage
signals to prevent their reflection through the data bus.
