Hyundai Yanmar TNV Series Manual page 47

CONTROL SYSTEM
The control program and the engine model-specific control map are maintained as prime constituents by
engine models. The individual data is created per each injection pump and engine and maintained as CS
data. Figure 2-12 illustrates constituents of the E-ECU data.
The control program is common to all engine models and cannot be customized per customers.
The engine model-specific control map is composed of two areas: the base area (unchangeable) that
defines engine performance including torque characteristics, and the option area that can be customized per
customers.
The individual data is injection pump and engine specific and, when the E-ECU is replaced, the data must be
copied to a new E-ECU. When the fuel injection pump is replaced, the E-ECU must be updated according to
settings of a new pump. The individual data are stored on EEPROM. Loading new individual data to
EEPROM automatically refreshes the map from the Flash memory area to the EEPROM area.
Flash memory is a nonvolatile storage, the maximum number of write cycles of which is usually 100, and
data stored in this memory is not lost if the E-ECU power turns off. Flash memory differs from EEPROM in
that the former does not accept write cycles during engine operation while the latter can be written to,
irrespective of whether or not the engine runs. A special device is needed to write data to Flash memory.
ECU
DATA
2-28
Flash memory (ROM)
Engine model-specific
· Base
· Options
Control program
Switching
(common)
· Factory correction
Flash memory writer
(factories, service shops)
Figure 2-12 E-ECU data configuration
control map
· Event log
Individual data
· Market correction
values values
Service tools
TNV Application Manual
EEPROM
Individual data
(market)