Hot answers tagged

13

There are two power systems on all electric cars (fully electric and hybrids alike). This is in conjunction with the much higher voltage battery packs which normally power the electric motors. The reason for this extra power system is to power things like lights, electronics, and HVAC systems (to name a few). Most hybrid vehicles (and never a fully electric ...


12

The first attempt at fixing the sudden shutdown issue was to replace the Electric Motor Cooling Pump. Since it was a recall the dealer replaced it for free. The picture pump above is the "out the factory model". The one below is the replacement model. There is an obvious size difference between both. You can find instructions on how to replace this pump ...


11

It depends on the type of hybrid car you are talking about. In one type of hybrid, there will be a gasoline engine and at least one electric engine capable of driving the wheels. In this case, the gasoline engine must still use a transmission because it cannot be revved too high without causing major damage or shortened life. One possible solution to this ...


10

Brake performance, or vehicle stability, not motive power are the primary concerns with trailer limits. Why no trailers in early hybrids? Several considerations; first is the battery. In hybrids with regenerative braking the electric motors act as generators producing electricity. Now that electricity has be put somewhere; it goes into the battery. But ...


10

They Exist I was unable to find any manufacturers that have rolled out this technology into production vehicles but there are several manufacturers that have the baseline technology in R&D Formula 1 Formula 1 has always been a playground for engineers and with the new rules implemented in 2012 the current platforms are running this technology and ...


9

As race fever indicated, many modern cars, and all hybrids, will record how many hours the ICE (internal combustion engine) has been running. It appears the Ford C-max, along with most other hybrids, pass this clock into an 'oil life indicator' (should have called it Oil Indicator of Life, or OIL for short!), which calculates and displays an alert for when ...


9

The other answers failed to emphasize an important point: the 12V battery on hybrid cars is not designed to start an engine, being much smaller than typical automotive starter batteries. Thus, it may not have the cranking amps capacity to successfully start the other car. The 12V battery is merely there to provide power for lights and to boot up the computer ...


9

Well, you have posted the link to the website, where they explain it, and also give this image: There are three E-motors. Two on the axes, and one on the same shaft as the combustion motor (C-motor), which connects to the axes via a hydraulic coupling and a differential with a ratio of 2.73 Now, let's play with that numbers. The C-motor has its red line at ...


9

Short answer, it is bad don't do that. Longer answer, the fuel pump is cooled by the gas in the tank and runs while the fuel system is pressurized. When you run it dry the pump can overheat which reduces its lifespan. This analysis is based on looking at a Chevy Volt fuel pump on ebay and saying from visual inspection that it was a fuel cooled model.


7

That model of car can't recharge from a charging station. It charges the battery either from braking or by using the petrol engine as a generator. So yes, you should in theory get the 50mpg without a charging station. However it can depend. I have no idea of the type of driving and the quality of roads you'll be driving on. Most of the benefits come about ...


7

No, it won't get damaged. But you also shouldn't let the battery totally empty for long periods. Li-ion batteries are best stored with some charge (normally about 40% is recommended charge level for long term storage per battery university :)) Volvo says that if you press the 'save' button your car will keep reserve charge or charge the batteries from ...


6

I don't entirely agree with the upvoted answer. I have read somewhere (but cannot locate the source right now) that the electrical power transfer pathway is 70% efficient in Toyota Prius, whereas the mechanical power transfer pathway is probably over 90% efficient. Consider this: the electrical components (inverters) have water cooling, but the mechanical ...


6

The car will charge its battery while driving, e.g. when you brake. This allows the electric motor to augment the diesel engine, reducing overall fuel usage. The result is that the charge state of the battery constantly changes. In other hybrids (Toyota Prius) the control system keeps the battery charge in a range that optimizes battery lifetime (i.e. ...


6

No, this is not possible. The high-voltage (HV) battery is used to start the engine. Remove this battery, and you soon find yourself unable to start the engine. The engine is started by motor-generators (MGs) operating on the HV battery, not a conventional starter motor operating on 12V auxiliary battery. Also, the simulated Atkinson cycle engine would ...


5

This is in theory possible, but I have no idea how to implement it in practice. The Prius HSD "Hybrid Synergy Drive" has, at its transmission heart, a planetary gearset with two power inputs: One from the internal combustion engine, and one from the AC motor/alternator. Each acts on a different element of the planetary set (carrier, ring, I don't recall ...


5

Lots of good answers, but will clarify something for what it is worth: All hybrid cars do have a 12V and a high voltage system. In my Prius (2009, 2003-2009 model), the 12v battery is in the boot. The standard car electrics like computers (all 13 of them) and screens and headlight and indicators and everything runs off the 12v battery. The 12v battery is ...


5

I don't think the accepted answer answers this question acceptably. The reason for hybrid vehicles having a mechanical power transfer pathway is that mechanical power transfer has a higher efficiency than electric power transfer. I have read somewhere (but cannot find the source right now) that the electrical power transfer pathway is approximately 70% ...


5

The chances of you driving to match the government specified "city" cycle, well it won't happen... Your city drive may not have the variety that the "city cycle" assumed ie X percent of highway, 3 stops etc etc. The mileage you are getting is down to the route you drive and the time you drive it. I used to have a long commute and if I left early ie on ...


4

The short answer is power requirements. Most of the vehicles are parallel, or mild hybrids, some are series/parallel (Prius and Tahoe come to mind), and there are a few series ones (Chev Volt). A series hybrid has to have enough electrical power to get the vehicle to top speed. This means bigger motors, even bigger batteries, and a decent size genset or ...


4

The Prius doesn't start traditionally. It actually has two motors, MG1 and MG2 (MG = Motor Generator.) MG1 replaces a traditional starter motor in the sense that it is responsible for spinning up the engine. If you've ever started a Prius while stopped, you might notice that it sounds different. That's because the computer first adjusts timing to reduce ...


4

I don't recommend driving it further; you risk packing up the cooling system if oil makes its way there. You might want to invest in some quick tests before you buy anything: You need to confirm if there is loss of coolant through the engine A few options here: perform a compression test to see if a head gasket or cylinder head is compromised perform a ...


4

Prius Gen4 (2017) apparently can go up to 72 mph with electricity only: https://priuschat.com/threads/what-is-the-max-ev-speed-no-ice.161545/ (message #5). However, that doesn't mean the tiny battery can propel the car forwards at that speed in all conditions. It just means the motor-generator 1 (MG1) won't overrev, because if the internal combustion engine (...


4

There are two reasons why a modern hybrid car could fail to start due to lack of electricity. Two reasons, because every hybrid car has two batteries (12V and HV). One is that the 12V battery is flat. You cannot push-start it then, as the 12V battery boots up the computers that connect the relay of the high-voltage (HV) battery. No computer boot up, ...


4

There are several issues with wanting to just add to the existing battery pack. The manufacturers could certainly design the car to be capable of it, but it's probably not something you can do as an end user. First, the car is balanced for a certain amount of weight, and the motor control algorithms are optimized for this. Adding more weight to the rear ...


4

It's not possible - and it's probably not what you want anyway. My first Prius lasted over 350,000 miles (570,000 km) without any battery maintenance whatsoever. If there were a way to run without the battery, you would be making the petrol engine do much more work, increasing your maintenance cost. Toyota HSD is careful to avoid over-charging or ...


4

Sounds like nominal behavior of power steering fluid at -20c. Unless there is no fluid involved with whatever that thing does to make the wheels turn, then it sounds like nominal behavior of an electrical system at -20c.


4

TL;DR If your car is advertised for 36 city and you are getting 32-33 then the discrepancy is only about 10% which is apparently really good. Even at 31 mpg it is just a 14% loss. Fuel economy is derived from dyno testing in a controlled facility, at controlled temps, controlled load, controlled resistance, controlled dust, and immaculate shifting. This ...


4

No, this vehicle as well as similar "hybrid" vehicles are designed to work this way. The gasoline-fueled part of the system will keep the batteries properly charged. This vehicle only has a very limited electric-only range (30-40 miles is what the ads say) and so unless your trips are always under this limit, the vehicle is going to be running on gasoline ...


4

I can relate a story from my own experience with my daughter's car. Turns out it had two bad ignition coils that caused the engine to misfire when it was raining. Did she stop when the check engine light came on? Nope! So the unburned fuel from the misfiring cylinders ends up in the catalytic converter. These things are designed to handle mostly burned ...


3

The wheel covers, or fender skirts Wikipedia says they are commonly called, are fairings installed to reduce drag in the wheel wells and thus to increase range. According to the same Wikipedia article, the Honda Insight is the only current production car that uses them. It is not so obvious, but I would expect to see that those cars would also have "...


Only top voted, non community-wiki answers of a minimum length are eligible