ETAS ES5340.2, Руководство пользователя

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ES5340.2 Electric Drive Simulation Board -User’s Guide 47
ETAS Hardware Description
3.7 RPM Generator
The ES5340.2 Electric Drive Simulation Board has a central RPM Generator that
outputs a speed-specific clock signal.
This RPM unit generates a 16-bit angle value that, in turn, is used for generating
arbitrary signals using analog or digital signal generators.
The maximum speed is:
• 60000 rpm (for 720° crankshaft angle of a combustion engine)
• 30000 rpm (for 360° mechanical angle of an electric motor)
The maximum angle resolution is 0.011 °CA (16 Bit).
3.7.1 Angle Clock Signal
The angle clock signal consists of three signals (see Fig. 3-11):
• The synchronization signal at 0 °CA
• The actual clock signal
• The signal for the direction of rotation (DOR)
A "High" level of the DOR signal means "Rotation with increasing crank-
shaft angle," while a "Low" level means "Rotation with decreasing crank-
shaft angle".
One of these three clock signals can be output via a multiplexer to the BNC con-
nection on the front panel (see "Connectors for the Angle Clock Signal
(ES5340.2-M only)" on page 101).
In addition, the engine speed can be output to this connection. This signal is
"High" (= 5 V) if the current crankshaft angle is between 0° and 360° and
"Low" (= 0 V) for crankshaft angles between 360° and 720°.
The following illustration shows the course of the four signals over one camshaft
revolution.
Fig. 3-11 Sync, Clock, Direction and Engine Speed signals
V
Low
High
Sync
V
Low
High
V
Low
High
Clock
Direction
V
Low
High
Engine Speed
α
0 °CA
720 °CA