The car made by EV manufacturers from the old days is a bit different!
If you look around the city, the charging spots are growing, and it is these days that you can feel the EV era has arrived.Sometimes we aim to be carbon native, and various EVs will be born and raised around the world.
That's why I want to know that EV is "Hey!"I want to know not only the websites that can be understood on the website, such as vehicle design and the size of the inside of the car!When I thought, Nissan responded with a core answer, "I'll talk about the Motor control of EVs."
The motor is a mecha full of romance that I loved since I was a child!Isn't it exciting to think about technology clogged in the details?……that?Speaking of which, when have you been making EVs ...?
▼ Those who guided at the time of shooting
Mr. Fukuchi: Japan Marketing Headquarters Brand & Media Strategy Department
▼ Those who have been interviewed online
Takashi Nakajima: Powertrain / EV Technology Development Headquarters Expert Leader
Wataru Maruyama: Power Train / EV Technology Development Headquarters Electric Power Train Project Management Group Lord
Kengo Fujiwara: In charge of the Precedable Vehicle Development Division of Planning and Advance Technology Development Headquarters
To unravel the history of Nissan ... The first EV was made more than 70 years ago!
In 2020, 10 years after the Nissan EV reef was born.The global cumulative sales have reached 500,000 units, which has been one of the high share as a Japanese EV, but in fact, Nissan has been making EVs before the reef.The Prince Automobile Industry, which Nissan Motor merged in 1966, and its predecessor TEPCO manufactured an electric vehicle called Tama in 1947.In other words, if you follow the roots, you are a manufacturer with an EV history of over 70 years.
"In Nissan's R & D (R & D), there is a volunteer activity called" famous car regeneration circle ". In about 2012, the electric car made in 1947 was restored.When I thought about it, I realized that it was one of the roots of the leaf. "(Mr. Nakajima).
In the 1970s, he developed an EV truck "Nissan EV4-P", and in the 1980s "EV Resort" for resort hotels and EV garbage collection vehicles.In 1990, the luxury sedan "President" was converted to EV.In particular, the minivan "Play Joy EV" was an EV with extremely high performance at the time, with the maximum speed of 120km/h and a cruising range per charge of 200km or more.
"In 2000, we also developed a light EV called" Hyper Mini ". Some of the development staff said that the wind of electric vehicles would blow from that time, so in preparation for the EV era, the motor and inverters were said to be a motor and inverter.I thought I had to improve the basic technology of Power Electronics "(Mr. Nakajima)
The output has doubled in the model number of the same motor!
And in 2010, the first leaf, which was finally seen, was equipped with a maximum 80kW motor EM61.At the time of minor change, the power was the same, and the motor EM57, which increased the amount of single -charged mileage from 200 km to 280 km, was used.And the current reef is the same as the Motor model number, but both power, torque (rotation), and mileage have increased significantly.
"When I made the first leaf, I didn't have much idea of" seeking power from electric vehicles ". Originally, I was able to run long distances based on the power that could be battery, and the size of the motor in other thoughts.It was decided. After that, when I made the second generation of the current leaf, I tested how much power I could get, and the motor could be doubled as it was. Specific specific.We have improved the control technology of using up the voltage of the battery as much as possible. "(Mr. Fujiwara).
When I experimented with a new motor and battery on the first reef, other development staff said, "This acceleration power is amazing."He understood that the power was justice.
"In the first time, the cruising range will decrease if power is put out, so it is designed to run power on highway to improve the electricity, so the power was secondary. But the battery gradually.The capacity of the battery is getting bigger and the battery runs out as soon as it runs. In addition, the battery that can increase the cruising range can bring out power. This after making the first leaf.In 10 years, the control technology of the motor has also increased and the performance of the battery has improved. I feel that various technological innovations have occurred in a well -balanced manner. "(Mr. Nakajima).
However, I am surprised at the small size of the e-powertrain.Motors, inverters, chargers, DC/DC converters, and deceleration machines are all packed with the engine and transmission in the internal combustion agent.
It is fascinated by the acceleration of the raging waves, but are you actually pulling out the power?
And the strength of EV is its acceleration power.The power of the start dash is a sports car class, so you can feel safe to join on a highway.
"The feature of EV is that the time when the power rises rises faster than the vehicle equipped with a gasoline engine. On top of that, there is a large sedan -class torque.There is also
"The engine does not have torque unless the air is sucked, but it takes time to flow the air, and it is necessary to increase the rotation to get power. So the gasoline engine carIf you do not wait for the engine speed to increase after stepping on the accelerator, you will not be able to bring out the expected power "(Mr. Nakajima).
However, in fact, even in the leaf, if the accelerator pedal is stepped in from the deceleration (that is, the regenerative brake is applied), the motor will not be suddenly accelerated, but will not be applied to the torque → will not be applied → will not be applied.It seems that it accelerates while exquisitely increasing or decreasing the torque.Why do you control such a control?There was a proposition called vibration countermeasures.
"If the motor torque is launched straight when the deceleration is re -accelerated, the drive shaft (a part that conveys the power of the engine and motor to the tires) will twist and vibrate. In order to cancel the vibration, acceleration is accelerated. Occasionally, the control of the torque is dared to remove the torque. In addition, the exquisite control of the torque is also a noise countermeasure from the backlash (gap / play) of the gear. To move the gear smoothly, it is in the meshing part. You have to make a gap, but if you keep the torque in a straight line, when the gears turn to the gap, it rotates vigorously because there is no resistance, and the gears and gears are hitting. Therefore, when the gears reach the gap, we control the torque and apply torque only when meshing. "(Mr. Fujiwara).
Too detailed!
With one accelerator pedal, you can freely accelerate and decelerate
The current reef is equipped with e-Pedal, which can accelerate and decelerate with one step of the accelerator pedal.When I actually ride it, this e-Pedal is amazing.The feeling of deceleration is natural as if you step on the brake pedal.It's so natural that you're driving, "Are you stepping on the brake pedal now?"Not only is the power of the motor while charging power as a regenerative brake, but the motor control technology that does not make the driver feel uncomfortable is the point of Nissan EV.
"If you make an old-fashioned reef equipped with e-Pedal, you will love you and your friends will increase (laughs). And we are not people other than the E-Powertrain development team or Otosin.(Sound / vibration) It is a flow that the number of friends of each expert, such as the person in charge of evaluation, has increased, and the evaluation and construction have worked well "(Mr. Nakajima).
In particular, on the slope, the first public road experiment was conducted in San Francisco, a slope town to pack the control until it slowed down with a natural feeling.That city has a fierce slope of 25 % or 30 %, so it seems that it was a good location to test.
Motor control technology is the overwhelming running performance of snow roads even in motorcycle driving.
I took the current Leaf E + at the "Nissan Intelligent Mobility Snow Test Ride Society" held in Hokkaido in February 2019, but the stability of the snow road was perfect.
Normally, it is said that the four -wheel drive is more stable on the snowy road, and the motorcycle drive is unstable, but the motor control of the motorcycle drive is controlled by the meticulous motor control, and even a frozen road is not dangerous.I was able to cornering, and I was able to accelerate and decelerate.You can see if the tires have slipped earlier than humans, and by controlling high -response torque, you can drive in a normal way.Isn't that amazing?
"We incorporate a program that controls the motor in 100th seconds in a 10,000 -seconds," (Mr. Maruyama)
"It's quite difficult to get this speed with a built -in microcomputer that can be in -vehicle. I implemented it with as simple as possible, but there are various know -how and efforts." (Nakajima).
Another advantage of EV is that you can change the personality of the vehicle by tuning of motor control.Leaf NISMO has a more dynamic acceleration feeling, and EV buses and EV ambulances can be optimally set according to the condition of the local road.
The noise that was revealed because it was EV, and the new value
EVs that are excellent in quietness because there is no engine, intake and exhaust noise.However, because the inside of the car is quiet, he seems to be worried about the new noise that has been heard.
"When I was trying to make the first leaf and was playing with hyper mini, people in the company said," EVs will hear the sound of hand on the handle. "The sound is different in plastic. It was discovered that the increasedness of quietness has begun to seek quality for what I was not bothered before, and that new value was born from here. "(Mr. Nakajima)
Isn't it easier to make an EV compared to a gasoline engine car?You may feel that way.I wonder if I can make a motor, battery and car body.
That's not the case.Nissan, who started the manufacturing of cars in 1911, and made EVs ahead of the times in 1947.The Nissan Reef, which they worked on as early as their own motor development and motor control technology, has spread to the world as an extremely highly evaluated EV.
Because it is a manufacturer that has been making high -quality cars and has a knowledge that makes the rider feel comfortable, it can develop high -quality EVs that make you feel high quality.I learned that.Nissan EV is a wonderful way to distribute the invisible place.If you have a chance, try riding once!
Source: Nissan Motor
