MrHockey

RX400H regenerative braking disengages before the traction battery is charged.

Recommended Posts

I drive down a hill on a regular basis, a highway off ramp, with a stop sign at the bottom.  As I brake I can see the power created by monitoring the kilowatt gauge, the needle dives into the blue showing the results of regenerative braking.  After about 4 car lengths the needle returns to zero even though I continue braking for many more car lengths. I can feel the reduction in braking when regenerative braking disengages and compensate by pressing on the brakes a little harder.  Meantime I am monitoring the traction battery graphics, the one that show how fully charged the battery is, and it show the battery is 3 or 4 bars below full.  So if the traction battery is not full why is the Regen braking disenging so quickly?  If I release the brakes for an instant a Mb d then apply them I can get the kilowatt Gage to dive into the blue again, and I can repeat this several times but with each cycle the amount the needle dives is less as is the duration.  The car is not throwing any codes.  As for fuel mileage, it's close to what it should be but I think it is slighty low, but it is hard to say for sure.  My sense is it is lower by approximately 1mpg.  If the regenerative braking would stay engaged for the duration of the hill this would go a long way toward topping up the traction battery.  The only thing I can think of is the graphics are lagging behind the actually state of the battery.  And I should mention I cannot remember the last time I saw the traction battery full.

Edited by MrHockey

Share this post


Link to post
Share on other sites
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Similar Content

    • By D Eric
      Curious how many Lexus owners have had a brake actuator failure.  We have a 2013 RX350; we bought a new RX450, and parked the 350 over the holidays planning to sell.  When I started it, numerous warning lights came on: the "Check AWD System" light, the engine light, and the VSC and Traction Control System lights. Upon taking the vehicle to our dealer, were we told that the brake actuator assembly needed to be replaced.  The cost to do so was $3,855.12.  I found there was a NHTSA recall on 2/12/2014 for this issue, requiring a software upgrade to avoid the failure of the brake actuator.  The dealer advises that software was updated in 2015 - which obviously didn't work because the brake actuator still failed.  Lexus is refusing to cover this, even though the predicted failure occurred anyway.  If anyone else has experienced this, please let me know.  I am preparing litigation on this issue.
    • By Jlogo1985
      I just got a 2007 Lexus gs350 from my cousin he got a new car so the car was sitting for 5 months when I went to start it no surprise the battery was dead I called aaa to jump when he had the charger on the battery it started and everything was fine but when you shut the car off it wouldn’t start again so I had it towed to Toyota and had the battery replaced they said they changed the battery and now the alarm won’t stop going off and the key fob isn’t opening the doors or trunk when you go in the car the computer gps starts up but car won’t start or turn off alarm I changed the key fob battery before I had all the issues I’m not sure if this is the problem but Toyota could not figure it out and I just spent $400 for them to tell me good luck get out of here I was hoping you guys could help me out please!!!  
    • By Andy_N
      Hi Guys,
      Couple weeks ago, my Lexus hybrid system light came on. I took the car to a  local Lexus dealer. They charged me $160 just to test the engine light and  told me to replaced my hybrid battery for $6,700. I am so broke I declined the replacement.  Last week, I opened the hybrid battery and tested all cells. Turns out all cells are fine. I reassembled the battery back in place and drove it for another week. Today while driving 70 mph on the highway the "warning hybrid light" comes on again  including check VSC, check ECB. Does anyone here has the same problem like it do? I know the battery is fine. Could the battery converter causing this problem?
      Any advise would be appreciated.
      Thank you.


    • By jjc1971
      Hi all,
      New to Lexus and new to here. I did try to search but couldn't find a thread related to this. Also posted this on the wrong thread - sorry. 
      Bought a 2004 RX300 a couple of weeks ago and I've been really pleased so far. But I now have an issue. A couple of days ago the belts squeaked for about a minute but it wasn't first start up of the day so I noticed and thought that's odd.
      Since then belts have squeaked a few times and again for a minute only and not from cold.
      Yesterday got in it to leave work at 5pm and got the squeak but also the red battery light was on for the first time so I turned off all the power hungry items. After about 5 mins the battery light went out again, and then I pulled over to pick up groceries. When i restarted car started ok with no noise and no red light but no power. There was nothing to indicate it was in limp mode, no warning lights just wouldn't pull.
      Any thoughts? My initial uneducated thought is alternator. Alternator may have semi 'seized' so with the squeak yesterday was alternator refusing to turn, but then it did turn but is so stiff its basically nearly stopping the engine but it is reluctantly turning hence the battery light is out.
      Is there any way I can test the alternator? Is my theory idiotic?
      Any help greatly appreciated.
    • By jjc1971
      Hi all,
      New to Lexus and new to here. I did try to search but couldn't find a thread related to this. 
      Bought a 2004 RX300 a couple of weeks ago and I've been really pleased so far. But I now have an issue. A couple of days ago the belts squeaked for about a minute but it wasn't first start up of the day so I noticed and thought that's odd.
      Since then belts have squeaked a few times and again for a minute only and not from cold.
      Yesterday got in it to leave work at 5pm and got the squeak but also the red battery light was on for the first time so I turned off all the power hungry items. After about 5 mins the battery light went out again, and then I pulled over to pick up groceries. When i restarted car started ok with no noise and no red light but no power. There was nothing to indicate it was in limp mode, no warning lights just wouldn't pull.
      Any thoughts? My initial uneducated thought is alternator. Alternator may have semi 'seized' so with the squeak yesterday was alternator refusing to turn, but then it did turn but is so stiff its basically nearly stopping the engine but it is reluctantly turning hence the battery light is out.
      Is there any way I can test the alternator? Is my theory idiotic?
      Any help greatly appreciated.