By invoking these operations, the PowerControlUnit can set the throttle and mixture of the InternalCombustionEngine. The PowerControlUnit can also read properties of the InternalCombustionEngine across the connector to find out the rpm, temperature, ...

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OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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Connector
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HSUV sample problem
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Since the ecu:PowerControlUnit part and ice:InternalCombustionEngine part are connected via these ports, the ecu:PowerControlUnit part may invoke setThrottle and setMixture on the ice:InternalCombustionEngine part via its ice port, across the connector...
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By invoking these operations, the PowerControlUnit can set the throttle and mixture of the InternalCombustionEngine. The PowerControlUnit can also read properties of the InternalCombustionEngine across the connector to find out the rpm, temperature, and whether it is knocking.
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Inversely, the InternalCombustionEngine can read the isControlOn property of the PowerControlUnit across the connector to determine if the unit is still operating, and possibly shut down if it is not.
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Figure 9-6 is a fragment of the ibd:PwrSys diagram used in the HybridSUV Sample Problem in Annex D. (The complete diagram is in Figure D.19.)
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