Deutz EMR 2, System Description, Page: 12 / 60

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© 06/02
EMR 2
System Description
3.3 Description of functions
The sensors attached to the engine provide the electronics in the control unit with all the relevant physical
parameters.
In accordance with the information of the current condition of the engine and the preconditions (accelerator
pedal etc.), the EMR 2 controls an actuator that operates the control rod of the injection pump and thus
doses the fuel quantity in accordance with the performance requirements.
The exact position of the regulating rod is reported back and, if necessary, is corrected, by means of the
control rod travel sensor, situated together with the rotation magnets in a housing of the “actuator”.
The EMR 2 is equipped with safety devices and measures in the hardware and software in order to ensure
emergency running (Limp home) functions (see Chapter 7.1).
In order to switch the engine off, the EMR 2 is switched in a de-energized fashion over the ignition switch. A
strong spring in the actuator presses the control rod in the de-energized condition into the zero position. As
a redundancy measure, an additional solenoid serves for switching off and this, independently of the actua-
tor, also moves the control rod in the de-energized condition into the zero position.
After the programming, that is carried out over the ISO 9141 interface, the EMR 2 is possesses a motor-
specific data set and this is then fixedly assigned to the engine. Included in this are the various application
cases as well as the customer’s wishes regarding a particular scope of function. The result of this is that any
later alteration must be reported back to the DEUTZ AG so that, in case of replacement anywhere in the
world, the new control unit can be programmed with the current data set.
3.4 Basic equipment
Besides the control unit, the following components are required as minimum equipment for the operation
of the engine:
Vehicle side:
!
Energy supply (battery)
!
Diagnostic interface (ISO 9141)
!
Fault lamp/diagnostic lamp
!
Diagnostic button
!
Set point selection
!
Key operated switch
!
Function change-over switch
!
Cable harness
Engine side:
!
Actuator (contains control rod travel sensor and positioning magnet)
!
Speed sensor (camshaft)
!
Coolant temperature sensor (NTC)
!
Cable harness
Further components and installation are possible depending on the application case or the desired
functions (see chapters 4 and 6). The combination can be selected from the DEUTZ pocket handbook.