Hybrid Car – More Fun with Less Gas

Where does extra electricity go? - Page 2

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Posted by mrv@kluge.net on December 31, 2005, 6:09 pm
'B' is for engine braking.  It's like trailer trucks' jake brakes - the
engine spins to bleed off your speed.  Under most conditions, you
actually get LESS battery recharging when in B mode (so it is NOT B for
battery, but actually B for braking).

When the hybrid battery reaches its upper charge limit (shows as 100%
on the screen, but in reality it's only around 80% of full charge on
the battery), the excess generated electricity is used to spin the
gasoline engine faster.  You'll probably hear the engine still spinning
once you get down to flat land and cruise along on surface streets in
electric-only, while the battery tries to get rid of that excess charge
and get back to its happy medium.

Posted by Chris Shearer Cooper on December 31, 2005, 8:16 pm
Which probably answers one of the other questions I had on this same trip

When going down a long hill, as long as the battery is still charging, is it
"better" to leave it in 'D' and use the brakes (rather than shift into 'B')?

Posted by Michelle Steiner on December 31, 2005, 11:39 pm

Every time I've tried to use B going downhill (including the Grapevine
on I-5 in either direction), it slowed the car too much, so I wound up
keeping it in D and using the brakes.  Keep in mind that except for
panic stops and when the car is going very slowly, the brakes are the
regenerative brakes and not the mechanical, friction, brakes.

Stop Mad Cowboy Disease:  Impeach the son of a Bush.

Posted by Bill on January 1, 2006, 1:45 am

Wouldn't it work to put it in B and accelerate to the desired speed?  I
mean, wouldn't light pressure on the gas pedal overcome engine braking as
with a conventional stick shift?

Posted by Chris Shearer Cooper on January 1, 2006, 2:42 am
 On long downhill treks, the batteries will fill up, and braking will revert
to the old-fashioned mechanical brakes.  So I'm thinking that Michelle has
the right idea, leave it in B and give it a little gas as needed .. that
way, the deceleration will be performed either by regenerative braking or
enging slowing?

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