Riding a Kawasaki H2 to chase the high-speed rail, the school beauty was moved to tears

imu is a very important electronic control device, but his car does not have it!

As the car entered the corner, Stoner behind him did not attack at Turn 1. He was giving Qin Chuan time to adapt.

He knows all the current MotoGP riders, and they have rarely been exposed to this kind of racing without electronic control.

If he attacks at this time, Qin Chuan may make a mistake and crash.

Qin Chuan was very careful during the entire process of entering and exiting the corner, and was very delicate in the handling of accelerating and braking.

Even if the electronic control is weakened, it can still run. One of the reasons why Qin Chuan is so careful is that this car doesn't even have an imu!

imu is a relatively unfamiliar term, its full name is inertial measurement unit.

The three letters imu are the English abbreviation of these six words.

This is a very important thing in today's era of two-wheeled racing cars and even civilian cars.

To be precise, it is a cross-era product, which has set off a very big wave in the history of the two revolutions.

The motogp team will collect data on the track. Even if the driver is injured and absent, the team will ask a substitute driver or even a test driver to participate in the competition to collect data on this track.

What is this data specifically? Part of it is imu's track monitoring data.

Currently, there are three types of electronic control for two-wheeled vehicles in terms of vehicle stability. ABS is the most well-known.

The full name of abs is anti-lock braking system, which prevents tires from locking.

If you brake too hard and the front wheel is suddenly held still by the caliper, it will cause the car to crash.

The working principle of ABS is to install a wheel speed sensor on the brake disc of the front wheel and the rear wheel. If these two wheel speed sensors find that the brake disc connected to the tire does not rotate, it means that the front wheel is locked.

They will transmit information to the ECU, the brain of the racing car, and let ESU reduce the braking force by controlling the brake oil pump and slightly release the brake disc to ensure that the front wheel can run at low speed without locking.

This has nothing to do with imu. Of course, no one in top competitions uses abs.

The second type is called dtc, and its scientific name is traction control.

However, this is not the traction control system used in today's motogp, but a common civilian version.

The traction control monitoring method of DTC is the same as that of ABS, sharing two speed sensors of the front and rear wheels to monitor the racing status.

As for judging the situation of the car, he will use the wheel speed difference to reflect it.

When the vehicle is driving normally, under normal circumstances, the rotational speeds of the front and rear wheels will be at the same level.

And suddenly the rear wheel speed becomes faster and the front wheel speed becomes slower.

There is only one possibility, that is, the driver is applying the front brake, and at this time, the rear wheel is out of control and spinning.

If the car is entering a corner, the rear wheel will slip and the car will race low or even high.

When the sensor detects that the speed difference reaches a certain level, the ECU will control the power output of the racing car after receiving the information from the speed sensor, for example, directly cutting off the oil and power.

This is also the oldest principle of traction control systems.

The disadvantages are huge, but it does not require too much debugging. Just like abs, you only need to set a trigger value in advance.

These two are the most basic electronic controls and have nothing to do with imu. They rely on two small sensors to prevent the vehicle from losing control.

The third type of electronically controlled tcs is where imu is most widely used.

It can be said that without imu, this car would not have the tcs function.

TCS is also called traction control system, which is the same as DTC, but it is more sophisticated and has an additional part called imu.

imu, inertial measurement unit, specifically it is actually a six-axis sensor.

It can monitor the running posture of the racing car in real time. These six axes are equivalent to the xyz axis in a mathematical three-dimensional perspective, and there are even three more axes than it. The movement of the motorcycle can be observed through six axes.

Whether the car leans forward, leans back, bends left or right, what the inclination angle is, how the shock absorbers shrink, whether it is exiting or entering a corner, tilting its head or tail, all these cannot escape the eyes of these six horizontal axes.

It can better monitor the movement of the car body in real time and even collect the movement data of the car body.

In other words, DTC uses two things to determine the state of the car body at the moment, braking or accelerating.

In addition to these two things, tcs also has a pair of eyes. It can see whether your car body is tilting, whether it is in a curve, exiting or entering a curve.

On the basis of tcs, many new functions have been extended, such as cornering abs.

ABS is very rigid, just like DTC. To put it simply, they have set a value. When ABS encounters front wheel lock, it will directly release the brakes to a set force.

After cornering ABS has imu, the front brake will lock up when making an inclination in the corner. The imu and ecu will gradually control the braking force through rigorous calculations, making the car very stable in the corner.

The computing speed of imu is terrible, and it can perform nearly a hundred acceleration and angular velocity analyzes per second.

The analysis is passed to the ECU, and the brain determines how to execute it and informs which part of the car to execute it.

It can be said that to a certain extent, a car with an imu is no longer ridden by a person, but by the racing brain.

You just have to brake, it's up to the ECU to decide whether to hit or not.

Qin Chuan first experienced this feeling with the BMW S1000rr. That car felt like it was teaching you how to ride a bicycle.

Of course imu has advantages and disadvantages.

The advantage is that the intervention of imu can make the electronic control operation more precise and flexible, while ensuring that the car is the fastest and the driver is not disturbed.

The disadvantage is that it requires a large amount of data support, and the large amount of data can only be completed after continuous debugging by engineers.

Six-axle civilian vehicles require a long time of tuning and testing before leaving the factory, while factory vehicles are even more rigorous. They have now developed to nine axles, require more comprehensive monitoring, and require a large amount of data.

Cars are upgraded every year, so at each stop, drivers need to run many laps to provide data analysis to imu.

As for the actual actual difference between dtc and tcs, Qin Chuan has already felt it.

This car does not have TCS traction control, and its exit from corners is obviously much slower.

Especially at the moment when the accelerator was turned on and out of the corner, Qin Chuan felt very uncomfortable.

As soon as the front wheel left the ground, there was a gap of about ten centimeters to the ground when it was suddenly knocked down. Then it rose up again and was suddenly knocked down again.

The front wheel jumped repeatedly between leaving the ground and landing, and the power of the car was also intermittently lost.

The front and rear wheels repeatedly jump sideways inside and outside the range set by the speed difference. This feeling of not knowing how to adapt is very uncomfortable.

This is very different from when Qin Chuan usually trains or even rides factory bikes.

imu was first used on aircraft and fighter jets, and was eventually used by the six major motogp manufacturers. It was first used on factory vehicles. After many years of testing, it was only transferred to civilian vehicles eight years ago.

When a factory car exits a corner, the speed is used to the extreme. With the support of a large amount of data, the factory car can almost always lift the front wheel when exiting the corner. The front wheel is suspended 5 to 10 centimeters off the ground and continues to accelerate for a long time.

In this range, the ECU will detect the specific posture of the car through the nine-axis sensor imu and see the condition of the car, so as to stabilize the accelerator for the driver, without giving too much oil.

It is very smart and will keep the acceleration of the car 10 centimeters above the ground.

Wait for the driver to finish exiting the corner, and then gradually land.

There is a big difference between the two. It is obvious that Qinchuan needs more delicate operation on this car.

The emergence of electronic control is to reduce drivers' mistakes and crashes due to fast pace. When cornering at such a fast pace as a liter-class racing car, it is difficult for Qin Chuan to be distracted and complete such delicate operations.

It's extremely difficult!