Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
Caleb Kraft
User Rank
Author
Re: There's an underlying assumption here
Caleb Kraft   10/29/2013 1:12:04 PM
NO RATINGS
Yeah, it really seems like this would be most useful for pushing a massive weight from a stop. They hydraulic systems are heavy and the power output is, from what I've seen, fairly short lived. Not really ideal for marketing to city/highway drivers of small vehicles.

cd2012
User Rank
Author
Re: There's an underlying assumption here
cd2012   10/29/2013 11:14:36 AM
NO RATINGS
According to the article the stored energy is used for short bursts of acceleration, not for steady state driving.  I imagine diesel engines are incredibly inefficient when trying to accelerate a massive load from stop, and that problem is what this technology addresses.  This technology isn't useful for highways, a primary use case for plug-in hybrids, so I don't know if one could make any statement about a hydraulic system being applicable for that use case based on this article.

 

Bert22306
User Rank
Author
There's an underlying assumption here
Bert22306   10/28/2013 6:54:07 PM
NO RATINGS
The underlying assumption being that the amount of energy stored by the compressed gas, or whatever the hydraulics is actually compressing, will never match the energy storage of a battery. Perhaps the fact that neither stores an adequate amount of energy makes the comparison moot, in my mind.

Specifically, there's no reason to assume that you can't have a plug-in "hydraulic" hybrid. You simply have an electric motor compressing whatever gas, while the car is parked at home. Much like electric plug-in hybrids change the battery while parked.

Some time ago, I read an article about flywheel-energized buses in Zurich. Same idea. Spin up the big flywheel on top, then use its energy to help move it along.

LarryM99
User Rank
Author
Comparative energy storage
LarryM99   10/28/2013 3:27:37 PM
NO RATINGS
I have heard of using pressurized gas as a propulsion mechanism, but this is the first that I have heard of using it as an energy recovery mechanism. It would seem to make sense, although obviously it depends on the efficiency of the storage and reutilization of the energy. Does anyone know what the comparative energy density between this and lithium batteries would be?

bobdvb
User Rank
Author
Hydraulic
bobdvb   10/28/2013 9:28:29 AM
NO RATINGS
I am not sure these should be called hydraulic hybrids, are they not "compressive" or "mechanical" hybrids? or even "pneumatic" and "fluid power" hybrids?

I like the idea of compressed gas hybrids because they could easily be designed to be safer than chemical batteries and the conversion losses should be equal if not better. Although gas at high pressure could present a hazard it can be placed in sacrificial casings which prevent explosive decompression.

The date of 2016, that Peugot propose for first production, seems quite a long time given our collective knowledge of both hybrid and compressive technologies, especially as work has been on going in various places since at least 2008.



Radio
NEXT UPCOMING BROADCAST
Why Connect a Car?
May 11, 1pm EDT Monday
Overview: Battle-hardened veterans of the electronics industry have heard of the “connected car” so often that they assume it’s a done deal. But do we really know what it takes to get a car connected and what its future entails? Join EE Times editor Junko Yoshida as she moderates a panel of movers and shakers in the connected car business. Executives from Cisco, Siemens and NXP will share ideas, plans and hopes for connected cars and their future. After the first 30 minutes of the radio show, our listeners will have the opportunity to ask questions via live online chat.
Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...