Ems (Engine Management System) - Volvo Penta TWD1643GE Series Operator's Manual

Presentation
20
EMS (Engine Management
System)
EMS is an electronic system with CAN communication
(Controller Area Network) for diesel engine control.
The system has been developed by Volvo Penta and
includes fuel regulation and diagnostic functions. The
system consists of a control unit, injectors, a number
of sensors that supply the control unit with information,
and connectors for diagnostics and functional checks.
The engine can be connected to a communication
interface comprising a CAN link and a serial link.
Input/Output signals
The information from the sensors provides precise
data about prevailing operating conditions and allows
the processor in the control module to, among other
things, calculate correct injection amount, injection
timing and check the engine's condition.
Fuel regulation
The engine fuel requirement is analyzed up to 100
times per second. The engine injection volume and
injection timing are controlled electronically via the fuel
valves in the injectors. The control unit receives signals
from sensors and monitors in order to determine when
the fuel valve must open and close. This means the
engine always receives the correct fuel volume under
all operating conditions, which means lower fuel
consumption and the lowest possible exhaust
emission.
Diagnostic function
The purpose of the diagnostic function is to detect and
locate any malfunctions in the EMS system, as well as
to protect components from damage.
If a malfunction is detected, this is announced by
warning lamps, a flashing diagnostic lamp or a text
message on the instrument panel, depending on the
equipment fitted. If a fault code is displayed it is used
for guidance in any fault tracing. Fault codes can also
be read by Volvo's VODIA tool at authorized Volvo
Penta workshops.
If there is a serious malfunction, the engine will be shut
down completely or the control unit may reduce power
output (depending on the application). Fault codes are
registered as an aid to fault tracing.
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