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 Post subject: Electrically Actuated Throttle Question
 Post Posted: Tue Apr 20, 2010 10:33 am 
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Joined: Mon Apr 19, 2010 7:12 pm
Posts: 3
Location: RPI Formula Hybrid
I am reading the rules document 3.5.7.2 and 3.5.7.2.1 and I have a question. We are planning to use a servo to actuate the throttle of our engine. This servo will be controlled by a microcontroller, which is algorithmically controlled from inputs including the potentiometer on the throttle pedal. The servo and engine throttle are connected by a linkage that has two return springs. In case of emergency, when the e-stop is applied, the power is cut to the servo, and the throttle quickly retracts to "full engine stop" (engine off). Is this allowed by the rules?

Thank you,
Justin Gullotta
RPI Formula Hybrid


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 Post Posted: Tue Apr 20, 2010 3:03 pm 
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Joined: Fri Jan 29, 2010 11:56 am
Posts: 44
Location: St. Cloud State University
it would probably be more safe to cut power to the spark plug.


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 Post subject:
 Post Posted: Tue Apr 20, 2010 3:08 pm 
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Joined: Mon Apr 19, 2010 7:12 pm
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Location: RPI Formula Hybrid
It is a diesel engine.


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 Post subject:
 Post Posted: Tue Apr 20, 2010 6:19 pm 
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Joined: Fri Jan 29, 2010 11:56 am
Posts: 44
Location: St. Cloud State University
what kind of diesel?
The best diesel we could find this past summer was a Yanmar 296 CC but it weighed too much so we just went with a cheap B&S.


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 Post subject:
 Post Posted: Tue Apr 20, 2010 7:05 pm 
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Joined: Wed Jun 03, 2009 1:29 am
Posts: 117
Location: Texas A&M
gulloj wrote:
It is a diesel engine.


I'm also very curious as to what diesel it is, as there aren't many options in that size range.

_________________
- Texas A&M 2009 FH Crew Chief
- 1st place FH '09: 981 pts


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 Post subject:
 Post Posted: Tue Apr 20, 2010 8:01 pm 
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Joined: Mon Jun 05, 2006 4:05 pm
Posts: 111
Location: Rules Committee
The rules say:
[quote]3.5.7.2 Throttle Actuation
If the engine is coupled to the wheels in such a way that a stuck throttle would result in uncontrolled acceleration of the vehicle, then the throttle must be actuated mechanically as described in 3.5.7.2.1 below. Otherwise the throttling device may be actuated either mechanically or electrically; i.e. electrical throttle control or “throttle by wireâ€


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 Post subject:
 Post Posted: Wed Apr 21, 2010 2:27 pm 
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Joined: Mon Jun 05, 2006 4:05 pm
Posts: 111
Location: Rules Committee
When I first posted my reply, above, there was a typo in the last paragraph--a missing "not". It's fixed now. Sorry for any confusion that created!


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