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student_documentation:intro:relay

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student_documentation:intro:relay [2019/04/02 02:25]
Christoph Zingg
student_documentation:intro:relay [2019/04/02 05:05] (current)
Christoph Zingg
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 {{:​student_documentation:​intro:​shutdownrelay.jpg?​direct&​600|}} {{:​student_documentation:​intro:​shutdownrelay.jpg?​direct&​600|}}
  
-The relay contacts (SPDT) are to be used to shut the enine off. For Spark Ignition vehicles this can be achieved by connecting it to the ECU engineConnection through ​the ignition coil is not permitted ​due to EMI problems. <del> Installing the normally closed (NC) relay contacts of the relay in series with the primary of the ignition coil will achieve the desired results. As an option, the NC relay contact could be wired in series with the fuel injector to achieve the same results.+The relay contacts (SPDT) are intended ​to be used to shut the engine ​off. Connect these contacts ​to your motor controller or ignition controllerDirectly switching ​the ignition coil primary winding ​is not permitted ​because it generates strong EMI emissions which may lead to On-Board Computer malfunction. <del> Installing the normally closed (NC) relay contacts of the relay in series with the primary of the ignition coil will achieve the desired results. As an option, the NC relay contact could be wired in series with the fuel injector to achieve the same results.
  
-For Diesel engines, installing the NC relay contacts in series with a fuel shutoff solenoid or in series with the fuel injector will kill the engine when the relay is activated. </​del>​+For Diesel engines, installing the NC relay contacts in series with a fuel shutoff solenoid or in series with the fuel injector will kill the engine when the relay is activated.</​del>​
  
 Before the event, teams should identify the circuit that will be wired through the shutdown relay. Before the event, teams should identify the circuit that will be wired through the shutdown relay.
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 ===== ICE ===== ===== ICE =====
  
-  * Shutdown ​relay must turn off engine when relay is activated. +  * The shutdown ​relay must turn off the engine when the relay is activated. 
-  * Connections can be from N to NC (Normally Closed) or from N to NO (Normally Open) depending on system configuration+  * Connections can made be from N to NC (Normally Closed, will open when relay is activated) or from N to NO (Normally Open, will close when relay is activated) depending on system configuration
   * Maximum current = 10 amps   * Maximum current = 10 amps
  
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 ===== BE & H2 ===== ===== BE & H2 =====
  
-Shutdown ​relay must disable propulsion when relay is activated. +The shutdown ​relay must disable ​vehihle ​propulsion when the relay is activated. 
-Connections can be from N to NC (Normally Closed) or from N to NO (Normally Open) depending on system configuration.+Connections can be made from N to NC (Normally Closed, will open when relay is activated) or from N to NO (Normally Open, will close when relay is activated) depending on system configuration.
 Maximum relay current = 10 amps. Maximum relay current = 10 amps.
   * Option 1 disables throttle input when activated   * Option 1 disables throttle input when activated
   * Option 2 disables motor control when activated   * Option 2 disables motor control when activated
   * Option 3 grounds motor controller when activated   * Option 3 grounds motor controller when activated
-Other methods will be accepted as long as the propulsion ​system is disabled when the relay is activated+Other methods will be accepted as long as the drive system is disabled when the relay is activated
  
 Shutdown Relay Connection Examples Shutdown Relay Connection Examples
  
 {{:​student_documentation:​be_shutdownrelay.jpg?​direct&​400|}} {{:​student_documentation:​be_shutdownrelay.jpg?​direct&​400|}}
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student_documentation/intro/relay.txt · Last modified: 2019/04/02 05:05 by Christoph Zingg