Hybrid Car – More Fun with Less Gas

Repair Costs - Page 9

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Posted by =?iso-8859-1?Q?mark=5Fdigital= on May 29, 2006, 11:21 am

If neither is functioning, how do you stop your car? Throw it in reverse?


Posted by A Sherman on May 30, 2006, 2:59 am

Use the mechanical brakes (of course).

By compression braking, I was referring to the ICE.  I am just speculating
that the car would be coasting in N.

There is no question that MG1 will need to spin if the ICE is stopped and the
car is moving.  I presume that when the car is in N,  MG1 will just spin as
necessary with no electrical power in or out.


Posted by =?iso-8859-1?Q?mark=5Fdigital= on May 31, 2006, 10:07 pm

I misunderstood what you meant by compression braking because the engine is
not involved with slowing the car. Approx 10% of the kinetic energy is drawn
away, and explicitly so, to resemble the "feel" we're accustomed to with a
conventional car.
Hmmm. I probably just made matters worst.
Have a good day and enjoy your Prius.

Posted by A Sherman on June 1, 2006, 2:24 am

"mark_digital©"  wrote

Thanks Mark, I do enjoy my Prius.

Your reply pointed out that I did not realize that MG2 ordinarily provides the
dynamic braking without involvement of the ICE.

Now that I am thinking about it, I assume that the ICE and MG1 must both be
involved in braking when in "B" mode.  They both must provide retarding forces
(actually torques) that are apportioned by the power split device.

I was assuming that this use of MG! and the ICE would also happen during
"dynamic braking".   Now I realize that this is unnecessary with dynamic
breaking provided by MG2.  So here are new questions:

Do I understand this correctly?
Is MG1 and ICE "pumping" ever used for retarding in "D", or is it only used in


Posted by =?iso-8859-1?Q?mark=5Fdigital= on June 1, 2006, 3:49 pm

I just went to a web site to get a better understanding and I can't see how
the engine can remain "hard connected" to the wheels, provide resistance and
all the while not suffer scored cylinder walls.

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