Search found 4673 matches

by methods
Apr 14, 2018 5:33 pm
Forum: Battery Technology
Topic: How to measure -60V to 1000V
Replies: 15
Views: 675

Re: How to measure -60V to 1000V

marcos wrote:
Sep 04, 2017 9:46 am
There are reasons not to play with this.
Sounds like a reason to redesign....

-methods
by methods
Apr 14, 2018 3:16 pm
Forum: Large EV General Discussion
Topic: Tesla manufacturing
Replies: 6
Views: 762

Re: Tesla manufacturing

Thank for having me over to you house when I was in Canada sir.

-methods
by methods
Apr 14, 2018 10:12 am
Forum: Large EV General Discussion
Topic: Azure Dynamics Transport Connect - I have one
Replies: 16
Views: 1253

Re: Azure Dynamics Transport Connect - I have one

Time flies... I still have one of these torn apart over at Google. The battery (last checked) was dead nuts perfect in every way shape and form. The only problem (as far as I can tell...) is that one of the modules in the system is not reporting. Likely - worst case... a few hundred bucks to replace...
by methods
Apr 14, 2018 10:07 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

As for motor control on a "Zero type" setup. Due to the PID and order of magnitude (meaning... there is not a direct 1:1 relationship between the throttle and the motor drive... and since the motor drive is on the order of 10's of KW...) It is normal for something like a big Sevcon setup to ... eh.....
by methods
Apr 14, 2018 10:04 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Skimming back thru time... At present - we are running POT throttles with a microswitch. We run 10V and an inlilne resistance There are failure modes for both Resistive and Hall throttles... The microswitch is NOT rated for direct 60V off the sevcon We sometimes run it off of that 60V in testing (We...
by methods
Apr 14, 2018 9:49 am
Forum: Motor Technology
Topic: 75-5 & 75-7 Motors - Looking for Test Engineers
Replies: 57
Views: 5621

Re: 75-5 & 75-7 Motors - Looking for Test Engineers

The motors have been out in some (safe) test vehicles now for some time now. We have destroyed more than a few in high stress testing (thanks Craig, for absorbing the cost of validation...) Ultimately... We strive to find a motor which has no failure mode at high RPM. This motor DOES have a high RPM...
by methods
Apr 14, 2018 9:15 am
Forum: E-Vehicles General Discussion
Topic: Luke (liveforphysics) article on Gizmag
Replies: 42
Views: 3362

Re: Luke (liveforphysics) article on Gizmag

. . . Lukes contribution to the Electric Revolution is unquestionably... ........................... One for the record books No other person pushed my personal boundaries further than Lucas Workman. I continue to vouch for Luke (in the same way I did when I baited him over to this forum... from som...
by methods
Nov 09, 2017 1:23 pm
Forum: Food and Drink
Topic: $55 unlimited high speed mobile data
Replies: 2
Views: 280

Re: $55 unlimited high speed mobile data

I have been doing pretty well balancing power usage on the phone with leveraging WIFI I went from apx 11GB data month down to 5GB last month... but that was only because I worked from home most of the time. I just reset my data counter. We will see..... Striaght Talk got into trouble 5years back for...
by methods
Nov 09, 2017 1:14 pm
Forum: Food and Drink
Topic: $55 unlimited high speed mobile data
Replies: 2
Views: 280

Re: $55 unlimited high speed mobile data

Of course... I will reset my data counter... and show that I am actually burning 10's of GB for that $55

Video conferencing daily on the go

-methods
by methods
Nov 09, 2017 1:13 pm
Forum: Food and Drink
Topic: $55 unlimited high speed mobile data
Replies: 2
Views: 280

$55 unlimited high speed mobile data

Straight Talk changed the plans again. The plan I am on now offers: 1) Unlimited calls and text (incoming international, no outgoing international) 2) Unlimited data.. it used to be 15GB at high speed (4G 50Mb on ATT towers), then low speed (2g crawl)... now it appears that they lifted the cap again...
by methods
Nov 08, 2017 3:44 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Report.jpg Ah man... really? Sigh... Ok... I am heading to the climbing gym then. Gotta burn off nervous energy in a way that involves physical activity I still have THIS going on in my shoulder ShoulderSmall.jpg But I have been going to physical therapy and the lady there (who climbs!) gave me the...
by methods
Nov 08, 2017 2:20 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Hey... we all have to put in our time as Meatheads.
Thats how you graduate to BrownHorn

-methdos
by methods
Nov 08, 2017 2:19 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Ok... I have a free hour. I am going to draw up the formal proof and present it. I am just DREADING calling Sevcon after all the negative feedback I have heard from guys in the field. Sure... fools call Sevcon all the time... so they cant have a $250k/yr Wizard answering the phone. I totally underst...
by methods
Nov 08, 2017 2:00 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Drew it on the board. Went over what I remember from talking with folks who were developing this stuff back in the day. Back in the day throttles with a built in switch were... I guess... not as available as they are now. Some major developers moved forward on a Magura type throttle - No switch. If ...
by methods
Nov 08, 2017 1:45 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

FYI... I am killing time over here. Day got derailed by a development. Should be over at Calfee Design wiring up a bike (parts are int) Excited to get that done. Engineering bike... clean one... :D I realized that I have been dragging my feet over the throttle interlock stuff. Trying to sort out the...
by methods
Nov 08, 2017 1:40 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

And yes... Unless the bikes I have tested were Engineering... There are more than a few out in the wild... That if you apply full throttle.... And then you bump out of Drive.... and then you bump back into drive... Step-function the throttle. Just tested it on the bench the other day. Admittedly it ...
by methods
Nov 08, 2017 1:36 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

So... thats not the spot we will deal with it. Rate of change would be a spot where we could do it How many 1000RPM per second it is allowed to accelerate But... those are across the board settings... and I only want to affect response at 0RPM Step Function (Throttle goes from 0% to X% instantly) Im...
by methods
Nov 08, 2017 1:17 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Arbitrary map pulled from our repository
ArbitraryMap.png
ArbitraryMap.png (21.49 KiB) Viewed 903 times
(ack... work stuff... to be continued)

Anyway - note the performance at 0RPM
Its a major trade-off and not the spot where I want to deal with adversarial throttle injection

-methods
by methods
Nov 08, 2017 11:31 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Slide #6 DVT, DCF's, DLD's and understanding the big picture.... A word of caution So... you are using DVT as your portal to the Sevcon DVT simply passes thru a DLD and, as far as I can tell, has no knowledge of the DLD behavior DVT parses a DCF It shows you whatever the last software programmer hap...
by methods
Nov 08, 2017 11:20 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Throttle direction

Forward
Reverse
FS1

Inch Fwd
Inch Rev

Deadman

Belly

Belt Fwd
Belt Rev
Belt Stop

-methods
by methods
Nov 08, 2017 11:18 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

So on a naive search (the kind that happens on a phone, at lunch, half distracted)... The only instance of the word Sequence is 2918 In there we see some interesting things... which can help us back out what the DLD is doing. Sorting by BITMASK=0x Your parsing machine produces the following (You hav...
by methods
Nov 08, 2017 11:04 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

Not it... but inching closer.... Looking for the bit (no pun intended) which insists that a sequence be: All other bits cleared (FWD, FS1, Other) Throttle now checked for return to zero (inside of a WINDOW... so... ARBITRARY percentage window) proceed if so, otherwise lock until return Yep... Racers...
by methods
Nov 07, 2017 10:00 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Re: Sevcon Gen4 - Throttle Interlock Sequence

That safety is built in, resistance in the 10s of k. Return to Zero behavior for "enable" is what I am trying to turn on. I will search the DCF... Steady state (not Startup) FS1, FWD, or both are open 50% throttle applied... Via Electrical fault FS1 and FWD are closed Looking to force a return to 0%...
by methods
Nov 04, 2017 1:43 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sevcon Gen4 - Throttle Interlock Sequence
Replies: 20
Views: 1042

Sevcon Gen4 - Throttle Interlock Sequence

Hey guys... As fechter always says... "one test is worth a thousand opinions" In short: Sevcon Gen 4 5K pot throttle (or even hall throttle) Built in NO micro switch We have 3 major events to detect and protect against 1) Low Votlage on Throttle signal 2) High Voltage on Throttle siginal 3) Unexpect...