Prius Transmission Repair

/Prius Transmission Repair
Prius Transmission Repair2018-05-03T23:49:13+00:00

Prius Transmission generator (MG1)

The small electric motor / generator (MG1) is an AC synchronous brushless AC motor . The maximum engine / generator speed is 10,000 rpm.Power: 25 Kw (34 hp) at 10,000 rpm. 

    The Prius / generator (MG1) in the Prius has two functions :

The first function is to generate electrical energy for the battery, s and the electric motor, MG1 then acts as a generator.The second function is to start the combustion engine, MG1 then works as a motor.

The Electric Motor MG2

The main electric motor / generator in the Prius is an AC 500V AC synchronous brushless AC power.
This engine has been fully engineered by Toyota after long experience with electrically powered vehicles and has the high KW per Kg output

The electric motor has two functions, the first function is the Prius drive and the second function is the generation of electrical energy within the Prius regenerative brake system. When the accelerator pedal is released and / or the brake pedal is depressed, the electric motor inhibits the Prius by operating as a generator. The resulting electrical energy is fed to the high voltage batteries so that they are charged

MG2 data: Power: 50 Kw (68 hp) at 1200 – 1540 rpm. Max. Torque: 400 Nm at 0 to 1200 rpm.            

What happens when we drive the Prius? 

Starting the ICE:



Starting the prius ICE:


Starting the ICE is provided by MG1, it runs by using
electric power from the high voltage battery.
If the Prius stops, the outer ring will also be kept quiet, because it is linked via MG2 to the front wheels.
The rotation of the Sun coupled with MG1 ensures that the Planetary wheel also rotates.
The planetary wheel rotates at a speed of 1 / 3.6 times the velocity of the Sun.
Where a conventional car starts the engine directly by supplying fuel and igniting it, Wait the Prius until the engine has a speed of 1000 rpm. MG1 rotates with a speed of 1000 x 3.6 = 3600 rpm. This speed is reached in less than 1 second. Starting the ICE at this speed ensures that the oil pump can bring oil pressure to normal operating pressure. As a consequence, less wear on the engine will arise during starting when starting a conventional combustion engine. At the start of the ICE, not all ignition cylinders are initially installed, which takes place stepwise, so that it starts smoothly and without vibration. Once the ICE is started, the speed is controlled by the computer to a desired value to heat the engine. Electricity is no longer used by MG1, because MG1 now works as a generator, electricity is returned to the batteries. There is a difference in starting the Prius when the ICE is cold and when The ICE is hot.

Driving with the Prius after a cold start of the ICE

Because the ICE is started in this situation, the power of the MG1 is transmitted to MG2 during gas (MG1 is connected to the planetary wheel via the Sun). At the time when more power is required, the ICE speed is increased by the computer. During this process, the ICE will turn the Sun tougher and the MG1 will turn the Sun slower, resulting in a power that sets the Prius on its way. The coupling of the ICE is split by the planetary wheel coupling in 72% to the outer ring and 28% to the Sun. Before we throttle the accelerator, the ICE drives stationary and does not provide a torque, but when we accelerate the accelerator, the ICE will deliver 28% of its torque to generator MG1 and the other 72% to the front wheels. The electrical energy generated by MG1 is reduced by MG2 and converted into a torque and transmitted to the front wheels. The electrical energy generated by MG1 is reduced by MG2 and converted into a torque and transmitted to the front wheels. (Figure 6) The electrical energy generated by MG1 is reduced by MG2 and converted into a torque and transmitted to the front wheels.


Driving with the Prius with a warm ICE:

Driving with a warm ICE takes place entirely on the electric motor.
During gas delivery, electrical power from the high-voltage batteries in MG2 is converted into a torque supplied to the front wheels. The speed of MG2 determines the driving speed of the Prius.

As long as the speed is low, the power consumption is not too high and the voltage level of the batteries is not too low, the Prius will be driven by the electric motor and the ICE will remain out of service.
The Prius is then called EV mode, also called stealth mode


Accelerate and hill on driving with the Prius:

If the power’s demand is high, the ICE and MG2 work together to meet this demand. When the accelerator pedal is pushed further, the ICE will provide more torque, which increases the mechanical torque to the planetary wheel and increases the amount of power generated by generator MG1. The excited electric power of MG1 ensures that MG2 delivers a larger torque to the front wheels. Depending on the status of the high-voltage batteries, an amount of electrical energy from the batteries can be used to make MG2 even more attached to the front wheels. However, when the speed of the Prius increases even more, the share of MG2 decreases in total power demanded. This is because the limit of 50 Kw is reached. The ICE takes account of the remaining assets. When the desired speed is reached and the accelerator pedal is lowered far, the demand for mechanical and electrical power will decrease and a portion of the power generated by MG1 will be released. This excess of power is then used to recharge the high voltage batteries. The available power in the battery ‘ S will only be used in this situation when accelerating quickly or when riding a steep hill. However, if there is no additional power in the batteries at this time, the ICE will have to deliver all the power and will temporarily decrease the performance of the Prius.
Driving at an average speed:

The moment we drive the Prius at a constant average speed on a flat road is the only thing to overcome the driving resistance. Row resistance consists of components, rolling tires, aerodynamics (air resistance), total car weight and friction loss of the various rotating components.
In this situation, the ICE is brought to a lower speed by the computer system. This has the advantage that the noise level of the drive is as low as possible and the comfort is at a high level.

During this higher speed and low speed of the ICE there is a typical situation. The direction of rotation of MG1 is now the other way round (see Figure 9), and in this mode, MG2 operates as generator and supplies electrical power to MG1, which in turn works as a motor. The Prius is powered by the ICE and MG1 in this fashion.
This is also called the “heretical fashion”

Prius Transmission While coasting

When you take off the foot pedal, the Prius slowly decreases due to rolling resistance and aerodynamics (air resistance). In a conventional car the engine remains connected to the driven wheels. The engine then runs without fuel supply, but still has compression and thus greatly inhibits the car. At the Prius this does not have to be the case because the ICE is stopped and thus stands still.
The Prius does, however, slow down like a conventional car, which is caused by the fact that MG2 will work as a generator in this situation.
The resulting electrical energy is fed to the high voltage batteries. The batteries will be charged. In Figure 10 , you see that the planetary wheel stops in this situation. The ICE has stopped and the generator takes care of the effect of braking on the engine. The advantage is that energy is being generated instead of energy being destroyed as in a conventional car.


Prius Transmission in reverse Gear

The Prius has no gearbox like a conventional car and therefore no reverse gear. The Prius drives backwards by using electric motor MG2. In normal situations, the ICE will stop when switching to reverse. (Figure 11)

The electric motor is rewound and drives the front wheels so that the Prius drives backwards. If the ICE does not stop, for example, because the charge level of the batteries is too low, the reverse speed is limited to protect MG1 from overflow. The speed of MG1 is higher when the ICE is in operation and the Prius is powered by MG2. (See also Figure 9)

The required power during reverse operation with the ICE in operation is provided by MG1 in this situation.







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Brian McDermott
22:18 29 Jul 18
After taking my 2007 Prius to the Toyota dealership and being quoted an extremely high price for the repair, I thought that my Prius was totaled. However, after looking online we found Ken and decided to take a chance. He ended up being able to fix it for half the price and a better warranty. He finished on time and even did more work to the car for free. Ken was a pleasure to work with and I will definitely be taking my car there for future repairs. I would highly recommend this place!read more
mark strain
21:14 25 Jul 18
2005 Prius- 159,000 miles While parallel parking last week, I kissed the curb with my passenger’s side rear bumper. It dislodged several supportive clips, showing about two inches of clear space on one side. I shook my head as the bumper was still attached but looking for a railroad track to tear it off. I called Ken at the Prius Repair Shop for advice. He asked several questions to make sure the car was drivable and the bumper wasn’t dragging the ground. He then asked me to bring it in the following day. I did, and he called back after lunch and said it was ready. Ken reattached the bumper with new clips and said, "no charge" as it only took several minutes to fix. For the last two years I’ve had Ken perform regular oil and filter changes, a tune-up, and replace the inverter and water pump. Ken is honest, understands the complex Prius Hybrid system, and does what he say he will more
Jason Laikam
19:44 14 Jul 18
Was having problems with coolant level. Ken helped me resolve my problem.. and gave me some good advice on my 200,000 miles Prius 2006. Assured me that it is a workhorse and that it had a long way to more
Chantal Elise
20:46 03 Jul 18
I just picked up my car from here, and I just want to say that all these 5 star reviews are well-earned!!!! I am so thrilled with the exceptional service I received and the quality of care. I didn't feel I was overcharged as I have with many countless other mechanics in the past, and my prius went from sounding like a jackhammer and a jar of crickets were jammed under the hood to being as silent as a snail!!! They didn't try to sell me a bunch of unnecessary junk, they didn't make me feel like an idiot, they were just kind and gracious and it's safe to say I won't ever be going anywhere else for maintenance! THANK YOU!read more
Jacqueline Toy
03:08 07 Jun 18
Ken is the best mechanic I know. I have been bringing my cars to repair for over 10 years now. I won't go anywhere else! I had a 1988 mercedes and now I have a 2001 toyota camry. Ken has helped me keep my cars running! I commute all the way to Laguna Hills since he is a very trust worthy mechanic. He is quick to finish any job that is necessary and will listen to anything that you may have a concern with. He is very friendly and I highly recommend for anything from oil checks to assisting with smog checks. There is a certified smog check right next door, so very convenient if you are needing to do that too!read more
Karolina Grechuta
23:04 04 Jun 18
This shop is absolutely amazing. I am so grateful to have found Ken. He is hands down the best mechanic I’ve been to. Very honest, and knowledgeable which is a rare thing in and of itself in this industry. My engine was making weird noises and I was taking it from one mechanic to another for diagnoses and estimates. I was not happy with anyone’s answers or integrity up to this point which led me to call Ken, whom I came across through a referral from a friend. When I first called him and told him the engine problem I was having with my Prius he asked me a couple questions and diagnosed the problem immediately which no one was able to do before. He didn't even hesitate. Based on the content of the questions, the speed to which he got right to the heart of the issue and his kindness, right there I knew he knew his stuff, he wasn’t going to take advantage of my situation and that's when I started to relax that I was finally in good hands. When I brought my car in he looked it over, confirmed his diagnoses and then spent hours trying every trick in the book to see if there was any way to save my engine. As it turns out my engine was failing due to other mechanics mishandling that I had been taking it to. Unfortunately it was too far gone at that point and I needed to make plans to replace it. Ken got to work and found a remanufactured engine for me at a very fair price, installed it and had my car back to me without any hiccups and in a very short timeframe. Ken is hands down THE expert when it comes to Prius hybrids. I will be taking my car to him for routine maintenance I don't want anyone else working on my car after this engine ordeal. There's no one like Ken you truly are in the best of hands with more
Nicole Lonberger
00:23 23 May 18
Prompt, friendly and fast service. Ken responded to my inquiry quickly and scheduled me to come in the next day. My check engine light was on. Ken checked it and told me instantly what need to change in my car. He was able to turn it around that same day. Ken also checked in to see how my car was running. Very happy with the experience. Will continue to go there & refer my more
Carla Mendoza
01:07 17 May 18
Thank you for fixing my Prius Ken!! Works great and got it to me quicker than I thought! I had to get a new motor installed which was a bummer but I'm glad I found Ken! Super nice and helpful, very knowledgeable!!read more
16:35 09 May 18
Awesome service! Quick turn around time, and fair pricing. Can’t really ask for more than that when it comes to prius maintenance or repairs! I will forever go to ken for all of my prius problems or maintenance that needs to be addressed. I had to have a few parts replaced on the prius and the dealership quoted me an astronomical price. After speaking with ken on the phone, I was educated on what exactly went wrong with my prius and what my options were to cut corners on cost. Bottom line! If you have a prius and don’t take it here you’re a fool.. Thanks ken, be seeing you in the future! -Paulread more
Stentorian Voice Training
23:56 02 Nov 17
I'm a shade tree mechanic and there were some unfamiliar hybrid stuff I just didn't want to deal with... Ken knows his stuff! Its a very personable small shop and he's honest about cost but very reasonably more
Jake Jones
16:18 12 Sep 17
Ken did a great job answering all of my questions and diagnosing my vehicle. I would highly recommend him to anyone.
Art Pazornik
18:11 09 Sep 17
I have had my car (2007 Prius) serviced by Ken 3 times and each time I've been totally satisfied. I have 253,000 miles on the car and as long as Ken's around I have no plans on replacing it. He is honest, fair and a terrific mechanic. I highly recommend him. 5 stars for more
Laura Gustafson
17:24 22 Aug 17
This place is great! I was having trouble finding someone to install a 12V replacement battery in my Prius but finally found their website and they installed it in about 20 minutes for more than half the price my Toyota dealership was charging. Really nice people and super knowledgable about hybrids!read more
Kristen R
21:18 12 Jul 17
Ken accommodated my car with ease and quoted me the best price out there. My car was back to me in a few short days, and now I'm very happy with the results. Thank you!read more
Denise Shaw
22:25 06 Jul 17
I'm so happy to have found and reached out to Ken before taking my Prius to the dealer. He diagnosed and fixed my issue in less than 24 hours at a VERY reasonable price. Ken will be my "go to" mechanic for all of my Prius more
Joe Wolfgram
00:53 30 Jun 17
Brought my car in with red triangle of death and got it fixed same day for half the price Toyota was going to charge me. I'm very happy, when I have more money I'll get my A/C fixed here more
Haytham Salem
18:01 14 Jun 17
It's always nice to get the job done by someone who really knows what he's doing! If you have an issue with your hybrid so don't waste your time and money somewhere else because this is the place to fix your car professionally and with a reasonable cost. I came here with some unknown issues, they took my car in a busy day and got it done in just few hours! I highly recommend this more
Leo Domino
19:16 07 Jun 17
My wife and I took our 2007 Prius over to Ken at Caspian Motors after reading great reviews about his business. We were about ready to give up on the Prius and get rid of it. Ken is a great mechanic and also a very honest one. He did a lot of great repair work on it for a very good price and saved our car! I HIGHLY recommend if you need car repairs, definitely go see Ken. He's got our business from now on!read more
Mary Manca
22:40 10 May 17
Ken at Caspian took the time to explain my options. He squeezed me in on a busy day, and did the work for the quoted price, far less than I would have spent at the dealership. I'm confident they know what they're doing, and will definitely go back and refer to friends and family. read more
Beach Smile Dental
16:43 21 Apr 17
Brought my Lexus hybrid to be checked after first taking it to the dealer....what a difference in price. Ken is very knowledgeable and got my Lexus hybrid battery fixed for less than half the price I was quoted. Highly recommended!read more
Shahram Ray
02:28 08 Apr 17
I have my two vehicle. Honda hybrid and lexus hybrid repaired at this place. My overall experience is very positive. I recommended friends and family they all have positive experience ken is very knowledgeable and know his craft very well. If you have hybrid vehicle I highly recommend this place. you won't be disappointed fair price knowledgeable and honestread more
Jacob Whitehead
18:35 28 Mar 17
I took my RX400h in for repair. Ken was absolutely wonderful. He was quick to give provide me with options and was the best price around. The dealer quoted me over 5 times what Ken fixed my vehicle for. I am truly grateful for his help!read more
Jean Ridlon
06:16 02 Mar 17
Ken has repaired my a/c, did my brakes, does my oil changes, and everything done timely, doesn't charge an arm OR a leg! I just love this guy. He's always available to explain everything, too. I highly recommend anybody with a foreign car to use this guy. My Prius is a little older and Ken is going to keep it going until it is MUCH more
Grady Raymer
21:15 31 Jan 17
As advertised- skilled, smart, polite and reasonable. Ken was able to bring my Prius back to life as other dealerships were offering to scrap it for me. Some mechanics are spooked by the Prius and yet Ken embraces it. Don't waste your time- go to an expert that cares = use this shop for all of your Prius needs. Very happy to have found this place in South Orange Countyread more
Nathaniel Masudal
19:36 21 Jan 17
Searching the web for a reliable and affordable mechanic close-by, I found Ken at Caspian Motors and am very glad I did. Calling right away, I explained what work needed to be done on my 2008 Prius and Ken quoted me his prices, and they were great! The job was done in half a day and got my car back running great! Highly recommend; definitely returning for future services. Thanks Ken!read more
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