kiev
Posts: 657
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Autonomous Attitude Control System?

Fri Jan 27, 2017 8:39 am

Has anyone else experienced autonomous self-braking by the miev in a high-speed cornering situation?

Piev Paul told me that his car did that this week as he was travelling a little too fast thru a corner--the car applied braking and lit up an indicator on the dash.

It would be interesting to read the CAN buss during such an event. It seems that the car has a steering wheel angle and torque sensor, also some sort of accelerometer or g-sensor, plus a yaw sensor, (maybe it has pitch and roll also?). So there is some software running to monitor the driving conditions and it will take action in the event that it detects an abnormal or potentially unsafe condition.

i had never considered something like this being part of the traction control system, or the anti-lock braking system--maybe this is anti-rollover...?
kiev = kenny's innovative electric vehicle

PV1
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Posts: 2916
Joined: Fri Apr 27, 2012 4:22 pm
Location: Pittsburgh, PA
Contact: Website

Re: Autonomous Attitude Control System?

Fri Jan 27, 2017 9:13 am

The ASC is very protective of the car. It'll engage if I hit the driveway at work a little too quick, and there is a dip in my road that triggers it every time. However, it rarely adds braking force, opting to either cut power or drop regen instead unless I'm definitely sliding.

How fast are you guys going around corners? I've taken Koorz (and Bear for that matter) around turns fast enough where it seems the car will break loose and slide off the road and not have it intervene. Maybe it detected oversteer and tried to correct (applying brake force to the outside front tire)?
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

2017 Bolt EV LT in Orange with QC - 7/31/2017

Driving electric since 2-21-2013.

JoeS
Site Moderator
Posts: 3475
Joined: Thu Dec 15, 2011 5:47 am
Location: Los Altos Hills, California

Re: Autonomous Attitude Control System?

Fri Jan 27, 2017 12:52 pm

Having thrown my Mitsi pretty violently around corners on many occasions, I'll attest to ASC's occasionally unwanted interventions consisting of abrupt regen stoppage and selective wheel braking, especially on rough road surfaces. Normally, it's difficult to even get the tires to squeal, but I'm glad to have ASC for my wife's sake (I know, not politically correct)! It's great that we can disable ASC when we participate in, uh, spirited driving. :roll:
ASC = Active Stability Control
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

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