2010년 6월 27일 일요일



My wife doesn’t drive a stick, why don’t any of the EVs have an automatic transmission? Do I have to use an AC motor in order to keep the automatic transmission?
You can make an automatic EV with DC just as easily as you can AC. The trick with an automatic is you need to have the motor slowly spinning ALL of the time to keep the hydraulics pumped up. Maybe you could find an old donor car that uses a CVT transmission, I don’t think they need the hydraulic pressure and they are automatic.

There are some AC motor setups that have been designed to replace the transmission as well, which might be what you are referencing. No reason you couldn’t run a DC motor with the same gear box, that is if someone will sell it to you and you can adapt it to the spline.

Depending on your driving you don’t necessarily have to shift that much, if at all. I only did city driving on my EV (under 40mph) and pretty much left it in 2nd gear all of the time.

Lee Hart posted the following on the EVList a while back:

If it’s a budget conversion, I’d say keep the automatic. Let the electric motor idle, just as it would with the ICE. Use a motor with a rear shaft, so you can put a pulley on it and drive the old alternator and other accessories (air conditioner, etc.).

Idling wastes a little power; it will generally draw 1-2 amps from the propulsion pack when stopped. This is low enough that you could leave it idling for a day or two before it discharged the pack.

Automatics that don’t have a locking torque converter are a little less efficient, so they will cost you 10% or so in range.

Comments 17
1.— Jim Calvert Aug 12, 2007 23:44 PM #

I have a 1988 VW Rabbit Cabriolet convertible that I would like to convert into an EV. The only problem is that it has an automatic transmission. Any possibility of finding an AC motor that could replace the transmission on this particular car? ... or how well would my car operate if I keep the auto transmission? Thanks.

2.— Joel Aug 13, 2007 18:22 PM #

I have a 1993 nissan 240sx. And i have the starter hooked up to a switch. This is so that i can turn it off at stops and goign downhill, and start it when needed. Without getting to as to why I do it, I leave the car in drive all the time. when the light turns green I just start it and the engine will crank then as soon as it gets to about 700rpms it engages into drive and drives off.It will engage as low as 500rpms and the only problem is that if the motor has too much time to “speed up” then when it doesn engage you’ll burnout…if thats the case. there’s no problem with leaving it automatic other than a small delay from when the motor spins and your wheel spin. if you would like the transsmission can be locked to 1st or second gear by selecting L1 or 1 depending on the transmission. reverse will work. Park will too, something manual transmissions cant do with an electric motor.

3.— Gavin Shoebridge Aug 24, 2007 17:54 PM #

Hey Joel, that sounds like a good idea.
I wish I’d thought of that years ago. Imagine a switch on the accelerator that starts the gas engine as soon as it’s even slightly pressed.
I know gas engines use something like three times the fuel (compared to driving) when starting, but it would still save quite a bit of money. The engine would start without even thinking about it.
Might be a bad thing too in a manual car.
There’s a few things that would need tweaking (ie: making sure the starter doesn’t try to start the engine while coasting at 60mph) but it could be a nice idea.

4.— Chris Jan 12, 2008 12:29 PM #

Lets look at some old race car technology. They sometimes use a direct hub in place of the torque convertor, which is why you would have to “idle” your motor. I’d like to try an auto trans, left in drive and take off in low with an electric motor. Although you’d want to choose a trans without a vacuum modulator and throttle valve linkage. (if that is possible)

5.— Dave Jun 01, 2008 13:49 PM #

A swith to cut/start the engine is a great idea. But bypassing the neutral saftey swith (so you can leave it in drive) is not. Your car could start in gear and take off on you. Also, it’s REALLY hard on the starter to start the engine like that, worse if it’s a manual and you’re starting it in gear. You’ll burn the starter out on no time. Starters are not cheap.

6.— Eric Jun 02, 2008 15:06 PM #

And if your car is like mine and you have hydraulic brakes, engine off = oh crap.

7.— Dan P. Jun 03, 2008 03:43 AM #

“And if your car is like mine and you have hydraulic brakes, engine off = oh crap”

This is a Vacuum Booster issue; you still have brakes just not the power assistance.

8.— Charles Jun 08, 2008 21:48 PM #

Can anyone recommend a good direct drive ac or dc engine setup that would effectively replace an AT tranny? Cars like the Tesla use one from ACPropulsion. Any others out there?

9.— Patrick D. Aug 24, 2008 15:54 PM #

What exactly is a CVT transmission? Also, would a front-wheel drive car with an automatic transmission have one? I’m thinking about converting a 2003 PT Cruiser to an EV in the future (after I’ve paid off the loan).


10.— EVdude Aug 24, 2008 18:00 PM #

A CVT is a Continuously Variable Transmission. the motor stays turning at a certain RPM but when you push the pedal a pulley moves further from the engine and axle pulleys and tightens up the belt. as the belt tightens the axle pulley speed increases thereby increasing the speed. if you need further info google CVT transmission.

11.— Dan P. Aug 25, 2008 03:35 AM #

Here is a link discussing diagnostics for vibrations with a CVT transmissions; it has some good information on which vehicles have them and pictures.
Pictures are good! I like pictures…

12.— EVdude Aug 25, 2008 21:46 PM #

Thanks for the link Dan. I didn’t know that they had invented a two pulley CVT but obviously they have by the looks of the pictures. a good example of a CVT transmisssion is the new John Deere mowers. instead of a 4 or 5 speed shifter they have an accelerator pedal and apparently these are attached to CVT transmission. they are very fun to drive at high speed(i clocked 9 mph on mine)

13.— Dan P. Sep 03, 2008 01:54 AM #

History of the CVT

“Leonardo DaVinci sketched the first CVT in 1490. Dutch automaker DAF first started using CVTs in their cars in the late 1950s; however technology limitations made CVTs unsuitable for engines with more than around 100 horsepower. In the late 80s and early 90s, Subaru offered a CVT in their Justy mini-car, while Honda used one in the high-mileage Honda Civic HX of the late 90s.
Improved CVTs capable of handling more powerful engines were developed in the late 90s and 2000s, and CVTs can now be found in cars from Nissan, Audi, Honda, Ford, GM, and other automakers.”


Also See: Variomatic

14.— Jeff Mar 14, 2009 15:07 PM #

Why wouldn’t an overdrive unit work as a replacement for a transmission to extend range at higher speeds.

15.— Scott Mar 21, 2009 23:40 PM #

Why would you need a torque converter in this case? If you were to get rid of that, what other “hydraulics” would need to be powered?

16.— JohnG Mar 22, 2009 20:24 PM #

There are virtually no automatic transmissions, bar the Power Glide, that have a low enough drag (or high enough efficiency) to justify having them; torque converter or not.

You cannot simply operate an A/T sans a converter because without hydraulic pressure (“engine” running ALL the time – even at idle) you can’t engage ANY gear.

The slight motor efficiency loss at low speeds (<35 MPH) of a single gear set-up more than outweigh any benefits of a transmission, any type of transmission.

17.— DanP. Aug 01, 2009 15:47 PM #

The main reason that I’d want to use an automatic transmission is that if anyone else drove the vehicle they could just put it in park when they were done driving and I wouldn’t be worrying the whole time if they’d remembered to set the parking brake when they got out. Also not all vehicle Parking Brakes are equal…

2010년 6월 18일 금요일

◇전기자동차 구조·장치 변경 허용

◇전기자동차 구조·장치 변경 허용
기존 내연기관 자동차를 전기자동차로 구조 변경할 수 있는 승인기준 및 절차를 국토부 장관이 별도로 고시할 수 있는 근거가 마련돼 시행된다.
다만, 전기자동차는 고전원 사용에 따른 감전 위험이 있기 때문에 안전을 확보하기 위해 구조·장치 변경을 할 수 있는 기준·자격·절차 등을 기존 내연기관 자동차와 달리 적용할 수 있도록 했다.
전기자동차 개조를 허용함으로써 최근 녹색교통수단으로 주목 받고 있는 전기자동차 시장 형성을 촉진하고, 전기자동차산업을 활성화할 수 있을 것으로 기대된다.

◇저속전기자동차 도로주행 허용
저탄소 녹색성장에 걸맞은 전기자동차의 개발 및 보급·활용에 기여할 수 있도록 저속전기자동차에 대해 일반 자동차와 다른 안전기준을 정하는 등 전기자동차가 도로주행을 할 수 있게 된다.
저속전기자동차의 특성을 감안해 시장·군수·구청장이 최고속도가 시속 60㎞ 이내의 도로 중에서 교통안전 및 교통흐름 등을 고려, 저속전기자동차의 운행구역을 지정할 수 있도록 했다.

◇자동차 등록사무 전국 처리제 시행
현재 시·도 관내에서만 처리 가능한 자동차 등록사무가 오는 6월부터는 지역에 관계없이 전국 모든 등록관청에서 처리할 수 있게 된다. 사업장 지역표시가 필요한 영업용 차량과 자동차매매업자의 매매용자동차를 제외한 비사업용 자동차는 전국 어디서나 신규·이전·변경·말소등록이 가능하게 되어 자동차 소유자의 시간적·경제적 편익이 크게 증진된다.

전기차 개조사업은 "기회와 위협 요인 공존

전기차 개조사업은 "기회와 위협 요인 공존"

전기차 부품개발업체 파워프라자, 19일 구조변경 비전 발표

노후 차량을 전기자동차로 구조변경하는 개조사업은 향후 글로벌 자동차산업 흐름에서 기회인 동시에 위협 요인이 될 수도 있다는 전망이 나왔다.

지난 19일 '2009 코아쇼' 기간 중 열린 '전기차 산업동향 및 기술세미나'에서 국내 전기차 파워트레인 솔루션 개발업체인 파워프라자(대표 김성호)의 송세명 전기차 연구소 부장은 이날 프리젠테이션을 갖고 해외 전기차 구조변경 사례에 대한 몇 가지 중요 흐름을 소개했다.

파워프라자 측이 발표한 자료에 따르면, 현재 전기차 개조사업이 합법화된 북미시장을 기준으로 구조변경 차량은 2012년까지 도입기(1만대)를 거치고 향후 10년 후인 2022년까지는 성장기(100만대), 그 후로는 성숙기 단계로 진입할 예정이다.

이와 관련 송세명 커置조瓚� 부장은 “현재 미국에서는 기름 소모가 많은 미니밴, SUV 등 수천만 대의 PSV 차량을 개조하자는 산업계의 의견이 정책에 반영되고 있으며, 석유가격의 폭등에 따라 향후 2~3년 내 전기차 개조사업이 성장기에 들어설 가능성도 제기되고 있다”고 밝혔다.

현재 미국 내에서는 10여 개의 전기차 개조회사가 개조사업을 진행하고 있으며, 대부분 파일럿 차량을 만들어 운영 중인 상태라 개조차량의 판매 실적은 아직 초기단계인 것으로 나타났다.

파워프라자 측은 불안정한 원유가격의 상승, PSV 전기차 개조 확산 운동, 친환경차 정부 보조금 지원 등을 기회 요인으로 들었다. 또 최근 배터리 회사들이 전기차 개조회사를 인수해 전기차 구조변경 사업에 진출하는 흐름도 점차 활발해지고 있다고 설명했다.

그러나 위협 요인으로는 개조된 전기차의 높은 성능이 요구되고, 크고 안전한 차량에 대한 운전자들의 전통적인 선호도가 높아 구매에 부정적 결과를 초래할 수도 있다는 점을 꼽았다.

현재 미국과 일본 등 전기차 구조변경이 합법화된 국가에서 구조변경이 활성화되기 위해선 플러그인 하이브리드 구매와 같이 구조변경 된 차량에도 세제 지원 등 정부의 보조금 혜택이 제공돼야 한다는 의견도 제기됐다.

한편 국내에서는 전기차 개발 중소업체들이 현재 해외로 수출 계약을 활발히 따내고 있으나 아직까지 도로 위를 달릴 수 있는 법안이 통과되지 않아 관련업계는 우선적으로 법령 마련이 시급하다는 지적이다.