Cam and Crank - Cam Encoder v2
Cam and Crank - Cam Encoder v2 — The cam encoder
generates a camshaft signal depending on the specified start and stop position
of the cam teeth. Up to 10 teeth are supported by the cam
encoder.
Library
Simulink® Real-Time™ - Speedgoat
Description
The cam encoder generates a camshaft signal depending on the specified start and
stop position of the cam teeth. Up to 10 teeth are supported by the cam encoder. To
disable o tooth, the start and stop angle of the tooth have to be '-1'. The current
implementation of the corresponding crank decoder supports cam profiles which meet
the following conditions:
Only one cam tooth
Start and stop angles of the cam tooth coincide with the start angle
of a crank tooth. e.g., for a crank profile with 18 teeth and 2 missing
teeth, possible cam start and stop angles are multiples of 20
degrees.
Ports
The Simulink block has one input port, two additional input ports per channel and
no output ports:
Inputs
-
Speed
Speed in rpm. The value has to match with the Speed value of the
corresponding crank encoder.
-
Cam start CH<x>
Start angles vector of the up to 10 cam teeth of channel <x> in
degrees [0, 720). The size of this vector must always be 10. If an
element of the vector is '-1', the corresponding tooth is disabled. An
example of a Cam start vector is [20, 60, 125, 550, -1, -1, -1, -1, -1,
-1]. In this case, the 4 configured teeth start at 20°, 60°, 125° and
550° respectively. The other teeth are disabled. The corresponding stop
angles of the teeth are specified in the cam stop port.
-
Cam stop CH<x>
Stop angles vector of the up to 10 cam teeth of channel <x> in
degrees [0, 720). The size of this vector must always be 10. If an
element of the vector is '-1', the corresponding tooth is disabled. An
example of a Cam start vector is [40, 90, 180, 665, -1, -1, -1, -1, -1,
-1]. In this case, the 4 configured teeth stop at 40°, 90°, 180° and
665° respectively. The other teeth are disabled. The corresponding start
angles of the teeth are specified in the cam start port.
Parameters
Tab: Module setup
-
Configurable I/O Module ID
This parameter associates a code module block with a configurable I/O module setup
block. Set this value to match the Module ID defined in the setup block of the
required configurable I/O module.
-
Channel Vector
A vector of channels this driver block entity will access. You can specify
channels in the range 1-N (N = the number of channels implemented in your specific
configuration file defined in the Setup block). The width of this vector also
defines the subsequent size of some of the following parameters if scalar expansion
applies. With a single block, all the channels of the block are synchronized.
-
Sample Time
Defines the base sample time at which this driver block gets its sample hit. This
parameter can also be set to -1 for inherited
sample time. The units are in seconds.
Tab: Cam Encoder
-
Crank master vector (read only)
The corresponding crank encoder master. This parameter is read-only,
and therefor only for information purpose. The crank encoder master is
predefined during the pin layout.
-
Number of teeth vector (read only)
This parameter defines the number of teeth defined in the crank
encoder master. This parameter is read-only, and therefor only for
information purpose. The number of teeth vector is defined in the crank
encoder mask.