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Old 02-01-2011, 04:00 AM   #31 (permalink)
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As I understand it Hybrids at the moment fall into 2 types.

- The Prius type with batteries storing regen / engine power which is used to drive or assist as required.

- The Insight type where the batteries store regen power which is used to assist but not to drive the car exclusively.

The Diesel Hybrids I've seen suggest they are going down the Prius route, which I assume is much easier to retro-fit to an existing vehicle, albeit with a loss in luggage space because of the battery pack and of course weight.

Are there any Diesel-Electric hybrids, now or planned or built in a garage ? I'm thinking like the old Diesel-Electric locomotives idea of a Diesel engine powering a generator which in turn powers electric motors - so the Diesel engine can stay at the optimum speed for load vs fuel use. It also means top torque from zero engine speed.

What would that mean in terms of the engine size, or rather the power required, and weight ? Does it make a smaller hybrid possible ?

A second point if I may, ironic this one. Part of the marketing push on the Mk2 Insight here in the UK is that it is an alternative to a Diesel, because you don't need the heavy duty gear needed for a 'fuel of the gods' engine - clutch etc. And now they are putting Diesels in Hybrids. Hmmm.

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Old 02-01-2011, 01:02 PM   #32 (permalink)
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Quote:
Originally Posted by Arragonis View Post
As I understand it Hybrids at the moment fall into 2 types.

- The Prius type with batteries storing regen / engine power which is used to drive or assist as required.

- The Insight type where the batteries store regen power which is used to assist but not to drive the car exclusively.

The Diesel Hybrids I've seen suggest they are going down the Prius route, which I assume is much easier to retro-fit to an existing vehicle, albeit with a loss in luggage space because of the battery pack and of course weight.
This is fairly accurate. I would emphasize the Honda Insight, Integrated Motor Assist (IMA) approach allows the high-torque capability of an electric motor to make a small displacement engine perform like one the next size up during acceleration. Several years ago Honda had a nice web page showing how the IMA fills in the torque needed at low rpm.

In the case of diesels, they pretty much have all of the low-end torque needed. This is my speculation about a diesel-hybrid version which today are mostly announcements of future products. The hybrid version should provide more engine OFF time and electric vehicle (EV) operation. This can avoid fuel burns at low power settings when the internal friction becomes a significant part of the fuel budget. It will also capture a significant part of the energy lost in braking.

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Originally Posted by Arragonis View Post
Are there any Diesel-Electric hybrids, now or planned or built in a garage ? I'm thinking like the old Diesel-Electric locomotives idea of a Diesel engine powering a generator which in turn powers electric motors - so the Diesel engine can stay at the optimum speed for load vs fuel use. It also means top torque from zero engine speed.

What would that mean in terms of the engine size, or rather the power required, and weight ? Does it make a smaller hybrid possible ?

A second point if I may, ironic this one. Part of the marketing push on the Mk2 Insight here in the UK is that it is an alternative to a Diesel, because you don't need the heavy duty gear needed for a 'fuel of the gods' engine - clutch etc. And now they are putting Diesels in Hybrids. Hmmm.
"Planned or built" . . . well there was this Top Gear approach which I believe involved a diesel powered generator strapped to their . . . 'machine.' I forget the episode but think of a box wrapped in aluminum sheeting with a dome on the roof for one of the presenters. I believe they used 'cartoon physics' in the design.

It is really hard to speculate on what a diesel-hybrid will actually be when delivered as there are subtle design aspects, 'fork-in-the-road' where either path works. To some extent these decision also come from a corporate culture about what drives their preferences.

As for commenting about marketing, I try not to curse before after-work, 'happy hour.' . . . Marketing, where really awful engineers are sent. The incompetent ones become managers. <grins>

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Old 02-01-2011, 04:22 PM   #33 (permalink)
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Originally Posted by bwilson4web View Post
In the case of diesels, they pretty much have all of the low-end torque needed. This is my speculation about a diesel-hybrid version which today are mostly announcements of future products. The hybrid version should provide more engine OFF time and electric vehicle (EV) operation. This can avoid fuel burns at low power settings when the internal friction becomes a significant part of the fuel budget. It will also capture a significant part of the energy lost in braking.
Aha - now it makes sense, I wondered given the woosh that Helga has why would I need any assist.

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Originally Posted by bwilson4web View Post
"Planned or built" . . . well there was this Top Gear approach which I believe involved a diesel powered generator strapped to their . . . 'machine.' I forget the episode but think of a box wrapped in aluminum sheeting with a dome on the roof for one of the presenters. I believe they used 'cartoon physics' in the design.
That is my son's fave episode, he collapses in laughter at The Stig walking down the wheelchair ramp after he delivered the prototype to Autocar mag.

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Originally Posted by bwilson4web View Post
It is really hard to speculate on what a diesel-hybrid will actually be when delivered as there are subtle design aspects, 'fork-in-the-road' where either path works. To some extent these decision also come from a corporate culture about what drives their preferences.
I shall watch also.

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Originally Posted by bwilson4web View Post
As for commenting about marketing, I try not to curse before after-work, 'happy hour.' . . . Marketing, where really awful engineers are sent. The incompetent ones become managers. <grins>

Bob Wilson
I suspect desperation. I can count on the fingers of two fingers the numbers of Insight Mk2's I've seen here in Embra. Mind you its only 1 finger for the total number of Insight 1s I have ever seen including several trips to the US. Still to see an Auris Hybrid either.
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Old 02-09-2011, 10:43 AM   #34 (permalink)
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VW may have one in Europe by 2013- a mini hatch getting 79 mpg.

Volkswagen Reportedly Preparing 79 MPG Up Minicar With XL1 Powertrain - Rumor Central
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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 02-09-2011, 11:20 AM   #35 (permalink)
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VW may have one in Europe by 2013- a mini hatch getting 79 mpg.

Volkswagen Reportedly Preparing 79 MPG Up Minicar With XL1 Powertrain - Rumor Central
the US needs to step up importing diesels! Europe is steaming ahead of us
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Old 05-30-2012, 01:47 AM   #36 (permalink)
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So did the Peugeot 3008 diesel hybrid finally make to production? I haven't seen one But yesterday I saw an ad for a diesel hybrid from Peugeot's sister Citroën, model DS5 iirc. The catch: it is only for lease. Why does this remind me of GM's EV1?
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[Old] Piwoslaw's Peugeot 307sw modding thread
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Old 05-30-2012, 01:06 PM   #37 (permalink)
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Quote:
Originally Posted by Piwoslaw View Post
So did the Peugeot 3008 diesel hybrid finally make to production? I haven't seen one But yesterday I saw an ad for a diesel hybrid from Peugeot's sister Citroën, model DS5 iirc. The catch: it is only for lease. Why does this remind me of GM's EV1?
We can get them all here in Belgium, but then this is really diesel territory.

The 3008 hybrid
Peugeot - Configureer uw wagen

508 hybrid.
Peugeot - Configureer uw wagen

We can also get the DS5 as direct sale.
CarSelector

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