TLeaf
Forum Supporter
Posts: 247
Joined: Sat Aug 07, 2010 12:08 am
Delivery Date: 15 Jan 2011
Leaf Number: 000225
Location: Renton, WA

Electric Power Steering

Mon Sep 13, 2010 9:01 pm

I seem to recall this having come up as a question in this forum and it appears we might now have an answer:
http://www.motortrend.com/roadtests/alt ... index.html

Not sure if this is a definitive answer (wouldn't be the first time an all-knowing moto-journalist was wrong), but atleast it's from a semi-reputable source. Asides from this little nugget of info, the article is a bit interesting as it sounds like they got to push the car a bit more than the typical review-writer. I am curious, however, about the mention of the charge controller being located behind the rear seats; doesn't this put it a bit far away from the front electrical connections and the connectors for the battery pack (also located at the front, according to the pictures I've seen)?

User avatar
garygid
Gold Member
Posts: 12464
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: Electric Power Steering

Mon Sep 13, 2010 9:07 pm

Yes, electric power steering.

The 3.3 kW charger only needs 15 (or 16) amps going to it,
so a little wire "distance" is not very important.

Question is, how does one open that transverse "hump" just
behind the rear seat to access/see the L1/L2 charger?
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

User avatar
EVDRIVER
Moderator
Posts: 6677
Joined: Sat Apr 24, 2010 7:51 am

Re: Electric Power Steering

Mon Sep 13, 2010 9:25 pm

There are different types of EPS, some are full and some assist off the steering shaft, I have driven the latter and it feels amazing and very connected. Since I have read several articles that say the steering is very easy this indicates it is over done for the american market which is unfortunate and you don't need power steering to be that easy unless you are very old. There are several items on the Leaf they made too car like such as regen and steering to make people feel like its a normal car which sometimes means a bit bland. EPS should be speed sensitive and taught with good feedback, some are done well and some overdone. I'm going to drive the Leaf in LA on the 1st so it should be interesting to see how it compares to others.

wgs1912
Posts: 31
Joined: Fri Oct 01, 2010 6:58 am
Delivery Date: 26 Jun 2015
Location: NW FLORDIA

Re: Electric Power Steering

Sat Oct 02, 2010 8:39 am

Nissan is already using electric asst. on versa and sentra and it is speed sensitive. Motor and control module mounted on steering column.
Is it better to let people think you are stupid than open your mouth and prove it?

User avatar
mwalsh
Posts: 9644
Joined: Thu Apr 22, 2010 10:10 am
Delivery Date: 05 Jan 2011
Leaf Number: 0213
Location: Garden Grove, CA

Re: Electric Power Steering

Sat Oct 02, 2010 10:02 am

wgs1912 wrote:Nissan is already using electric asst. on versa and sentra and it is speed sensitive.
Hopefully that means it'll get heavier on the Leaf at high speeds? It really is VERY light at low speed.
2011 Blue Ocean SL with 83,000 miles
2015 pack on 12/30/15
Tinted windows
Bosch AGM 12v
Ecopia 422+ tires
L1 EVSE upgrade
FIAMM horns
Superbright LED lighting
2013 sun visors
LED shifter
Heated seats
GT-R map lamp lenses
Altima illuminated door switches

User avatar
garygid
Gold Member
Posts: 12464
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: Electric Power Steering

Sat Oct 02, 2010 10:24 am

Many know this, but a few might not:

Very Light means a "strong" assist, feeling like very little effort is required to move the wheel.

Although "light" steering can help make turning the wheel while parking much easier, it tends to remove the "road feel" from steering.

When a car's wheels (tires) are "pulled" to the left or right, by uneven road surfaces, ruts, groves, etc., the driver can normally feel the steering wheel try to twist in his grip. This gives the driver better feedback and a stronger feeling of being "connected to" (being aware of) the road conditions. Thus, one has a greater feeling of "driving" and being the one who controls the car's motion and steering, rather than just riding in a robot-controlled vehicle.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

User avatar
mwalsh
Posts: 9644
Joined: Thu Apr 22, 2010 10:10 am
Delivery Date: 05 Jan 2011
Leaf Number: 0213
Location: Garden Grove, CA

Re: Electric Power Steering

Sat Oct 02, 2010 11:17 am

garygid wrote:Although "light" steering can help make turning the wheel while parking much easier, it tends to remove the "road feel" from steering.

Maybe this is where this "vague steering" comment we've heard a couple of times is coming from.
2011 Blue Ocean SL with 83,000 miles
2015 pack on 12/30/15
Tinted windows
Bosch AGM 12v
Ecopia 422+ tires
L1 EVSE upgrade
FIAMM horns
Superbright LED lighting
2013 sun visors
LED shifter
Heated seats
GT-R map lamp lenses
Altima illuminated door switches

User avatar
Jimmydreams
Posts: 1500
Joined: Fri Apr 23, 2010 6:44 pm
Delivery Date: 08 Jan 2011
Leaf Number: 0175
Location: Oceanside, Ca.
Contact: Website

Re: Electric Power Steering

Sat Oct 02, 2010 11:37 am

mwalsh wrote:
wgs1912 wrote:Nissan is already using electric asst. on versa and sentra and it is speed sensitive.
Hopefully that means it'll get heavier on the Leaf at high speeds? It really is VERY light at low speed.
I thought almost everyone had variable power steering nowadays; very light at low speeds, but at highway speeds, it's basically manual steering to allow for 'road feel'. I'm expecting the same in the Leaf.
JimmyD
http://www.jjhamilton.com/solar
Blue SL Leaf delivered 1/7/2011
EVP participant. EVSE: Blink
6.75kW PV solar

wgs1912
Posts: 31
Joined: Fri Oct 01, 2010 6:58 am
Delivery Date: 26 Jun 2015
Location: NW FLORDIA

Re: Electric Power Steering

Sat Oct 02, 2010 11:40 am

It turns off all asst. at higher speeds unless it sees a rapid change in steering angle and has full asst. in parking lot manuvers.
Is it better to let people think you are stupid than open your mouth and prove it?

User avatar
evnow
Moderator
Posts: 11477
Joined: Thu Apr 22, 2010 11:41 am
Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

Re: Electric Power Steering

Sat Oct 02, 2010 11:43 am

wgs1912 wrote:It turns off all asst. at higher speeds unless it sees a rapid change in steering angle and has full asst. in parking lot manuvers.
Yes, that is what people doing test drives are reporting.

BTW, are you in some way an insider in the auto industry (dealer or connected with Nissan) ? You can PM me if you don't want to post it in public.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

Return to “Engineering”