HCHII Technical Facts (for the nerd in all of us)
#11
(for the nerd in all of us)
I think that HCHII owners tend to populate the intersection of Venn Nerd and Gearhead.
This is a very informative piece. Thanks for putting this together.
As an interesting sidebar, in the quest for a higher efficiency internal combustion engine, there is quite a re-think going on on how an IC engine works. For example, the distributor is a thing of the past for spark distribution. Next up, bye,bye camshafts to open and close the valves. You can expect in the next few years that the intake and exhaust valves will be manipulated by solenoids, giving an infinite number of "grinds" and available as needed. That coupled with electric and electronic drive systems will make a really interesting car.
This is a very informative piece. Thanks for putting this together.
As an interesting sidebar, in the quest for a higher efficiency internal combustion engine, there is quite a re-think going on on how an IC engine works. For example, the distributor is a thing of the past for spark distribution. Next up, bye,bye camshafts to open and close the valves. You can expect in the next few years that the intake and exhaust valves will be manipulated by solenoids, giving an infinite number of "grinds" and available as needed. That coupled with electric and electronic drive systems will make a really interesting car.
Last edited by Orient Express; 11-05-2007 at 06:42 PM.
#12
Re: HCHII Technical Facts (for the nerd in all of us)
In a conventional vehicle, the alternator must be designed to handle high electrical loads at engine idle speed (very low rpm) and to accomplish this, alternator/generators must be large (i.e. heavy and fuel-robbing). By contrast, at higher rpms when driving, the typical alternator could be downsized by a factor of 4X or more since its output increases with rpm. Similarly, conventional power steering pumps rob engine power even when the assist is not needed (such as driving in a straight line on the freeway.) Those are the compromises of conventional vehicles. Sounds downright primitive, doesn't it?
Indeed, upon inspection, you will see that the HCHII has no alternator or power steering pump to rob FE. The only engine driven accessory is the dual-mode A/C compressor which is designed to run off battery only whenever possible.
#16
Re: HCHII Technical Facts (for the nerd in all of us)
Thank-you for the posting, but . . .
Is this a contradiction of the Owner's Manual, which stated that the ABS is run on two circuits, with opposing corner brakes connected? So, if it fails on one of them, say the front-right an rear-left wheels, you will still have ABS braking on the other two wheels, potentially maintaining some forward control.
Is this a contradiction of the Owner's Manual, which stated that the ABS is run on two circuits, with opposing corner brakes connected? So, if it fails on one of them, say the front-right an rear-left wheels, you will still have ABS braking on the other two wheels, potentially maintaining some forward control.
#17
Re: HCHII Technical Facts (for the nerd in all of us)
Thank-you for the posting, but . . .
Is this a contradiction of the Owner's Manual, which stated that the ABS is run on two circuits, with opposing corner brakes connected? So, if it fails on one of them, say the front-right an rear-left wheels, you will still have ABS braking on the other two wheels, potentially maintaining some forward control.
Is this a contradiction of the Owner's Manual, which stated that the ABS is run on two circuits, with opposing corner brakes connected? So, if it fails on one of them, say the front-right an rear-left wheels, you will still have ABS braking on the other two wheels, potentially maintaining some forward control.
Bottom line: 4-channel ABS is the best system to ensure optimum control of each wheel during impending lock-up. This is important when the wheels of the car may not all be on the same type of terrain during severe braking, for instance, when someone brakes hard while the left wheels are on pavement and the right wheels are off on a gravel/sand shoulder of the road. Wheel lock-up characteristics will be different depending on the surface under the tires and 4-channel ABS can adjust to the changing conditions under each wheel independently.
Hope that helps.
#18
Re: HCHII Technical Facts (for the nerd in all of us)
Yes, yes, and...yes. 6500 rpm is the mechanical redline and the electronic limit for fuel delivery. To protect the engine from damage, the fuel injectors shut off if the engine speed exceeds 6500 rpm. When the revs come back down below 6500 rpm, the fuel system kicks in again. This method of over-rev protection is nearly universal among vehicles with computer-controlled fuel injection.
On the CVT version. You cannot exceed redline while in gear. You can floor it and the car will maintain redline without going over.
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