Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - I want to build a 100-mpg car (and I want it to look vintage)

ProDigit · 10-30-2020, 06:39 AM

One thing hybrids all have wrong, is they all expect to have gasoline engines that have sufficient power to accelerate the car at highway speeds, and their electric motors are 'helper motors'.
That pattern of thought is just plain wrong.

Instead, what they should do is base a hybrid on an all electric vehicle, cut the battery by 1/3rd to 2/3rd, and the weight savings, stuff a 'helper engine' in there.

With that I mean, the electric motor needs to be powerful for high regen braking and acceleration.
All the while, in the front have a 2 cylinder 400-600CC ptwin engine, that has enough power to keep you cruising, but no acceleration power.
A 600cc engine could keep you cruising at 60MPH with no trouble. Gear it right and you'll get good gas mileage.

Doing it this way, you can combine a 104eMPG motor, with a 100MPG engine.

The good is, if you're running the engine below 60MPH, you can charge the battery on the go.

All you need is some gear slider.
Eco gear runs the engine at lowest RPM without lugging ~1000-2000RPM (fully gasoline, no charging).
-1 gear runs the engine at higher RPM (torque peak 2000-4000 RPM), drive slow, and remaining power is routed to charge the battery (maximum efficiency).
-2 gears, runs the engine at a high RPM (close to HP Peak 4000-6000RPM), Rout as much power to charge the battery as possible (less efficient, for more quickly charging a drained battery).

You don't really need a big battery for this.
A 35 mile battery, with the possibility to charge while driving at below 60MPH gets you enough range to basically run indefinitely (like a gasoline engine).
At >60MPH (eg: 80MPH), a 35 mile all electric battery charge, could possibly get you 100 miles or more, as long as the helper engine is running the brunt of the load.

All you need is about 5HP to do 45MPH, and 12HP to do 60MPH.
If your engine is rated at 20HP, you could probably hit 65-70MPH, and let the electric motor fill in the remaining energy at anything above this.

Reducing the battery pack by 50-66% is reducing the biggest cost on an electric (hybrid) car!

10-30-2020, 06:39 AM	#183 (permalink)
ProDigit EcoModding Apprentice Join Date: Jun 2012 Location: Florida Posts: 222 Thanks: 0 Thanked 22 Times in 18 Posts	One thing hybrids all have wrong, is they all expect to have gasoline engines that have sufficient power to accelerate the car at highway speeds, and their electric motors are 'helper motors'. That pattern of thought is just plain wrong. Instead, what they should do is base a hybrid on an all electric vehicle, cut the battery by 1/3rd to 2/3rd, and the weight savings, stuff a 'helper engine' in there. With that I mean, the electric motor needs to be powerful for high regen braking and acceleration. All the while, in the front have a 2 cylinder 400-600CC ptwin engine, that has enough power to keep you cruising, but no acceleration power. A 600cc engine could keep you cruising at 60MPH with no trouble. Gear it right and you'll get good gas mileage. Doing it this way, you can combine a 104eMPG motor, with a 100MPG engine. The good is, if you're running the engine below 60MPH, you can charge the battery on the go. All you need is some gear slider. Eco gear runs the engine at lowest RPM without lugging ~1000-2000RPM (fully gasoline, no charging). -1 gear runs the engine at higher RPM (torque peak 2000-4000 RPM), drive slow, and remaining power is routed to charge the battery (maximum efficiency). -2 gears, runs the engine at a high RPM (close to HP Peak 4000-6000RPM), Rout as much power to charge the battery as possible (less efficient, for more quickly charging a drained battery). You don't really need a big battery for this. A 35 mile battery, with the possibility to charge while driving at below 60MPH gets you enough range to basically run indefinitely (like a gasoline engine). At >60MPH (eg: 80MPH), a 35 mile all electric battery charge, could possibly get you 100 miles or more, as long as the helper engine is running the brunt of the load. All you need is about 5HP to do 45MPH, and 12HP to do 60MPH. If your engine is rated at 20HP, you could probably hit 65-70MPH, and let the electric motor fill in the remaining energy at anything above this. Reducing the battery pack by 50-66% is reducing the biggest cost on an electric (hybrid) car! Last edited by ProDigit; 10-30-2020 at 06:51 AM..