Part 1 | Preface

Many young people travel around the city for their careers, unable or unable to tolerate the traffic jam of motor vehicles. Public transport is still their best choice. In order to solve the "last mile" problem, various electric scooters and balance cars have become popular for a while, but major cities have successively issued bans, The choice of convenient and safe travel tools has become a headache for such people! The Dayu Smart Drive DYU A1 produced by Flywheel Weir, which is recommended today, integrates folding design, manual riding, electric power assistance and pure electric driving, avoiding the embarrassment of electric vehicles that exceed the standard. The classic bicycle design is also safer and more reliable than electric scooters and balance cars. Special thanks to the first community of trendsetters- Love to play computer games At the same time, the author will adhere to the objective and fair principle to present the specific performance of Dayu Smart Drive DYU A1 to everyone.

Part 2 | Evaluation before test

The classic advertising slogan of Mercedes Benz smart, "the spirit shuttling in the city", is compact and flexible, and can be used to describe the big fish intelligent driving DYU A1. As a high-end brand under Flywheel Weir, Dayu follows the classic folding bike design, and is equipped with the DTST smart bike system jointly developed with the DYU team in Silicon Valley of the United States, aiming to create a more fashionable and free travel mode for young people.

Is it an ordinary bicycle? It seems that there is also a sense of sight of the big folding bike. If it is not for the black rear wheel motor, it is not very different from the ordinary folding bike in appearance. Naturally, the traffic police will not talk to you.

It can be seen from the configuration parameters that the Dayu Intelligent Drive DYU A1 adopts a 14 inch wheel diameter design, is equipped with 5.2AH Tesla LG lithium battery that can be charged in three hours, and the 36V 250W brushless motor can provide continuous power of 30-55Km under different power modes.

Different from the design of the bicycle+external electric system with the sense of disobedience, Dayu Intelligent Driving DYU A1 ingeniously integrates the power system and control system with the appearance of the traditional bicycle. The battery is hidden in the front horizontal tube. This way of built-in battery avoids the bulkiness of the external battery compartment, But it also brings a disadvantage that cannot be ignored - users cannot replace the battery or disassemble the battery for independent charging.

However, unlike the average three-year life cycle of lead-acid batteries for ordinary electric vehicles, the lithium batteries with excellent performance have a longer service life, which is more than three times higher than that of lead-acid batteries on average. In addition to the design that can be filled in three hours and has a maximum endurance of 55 kilometers, what can be said for the sake of simplicity and fashion?

Dayu Intelligent Drive DYU A1 adopts the aviation aluminum alloy body commonly used by single cars, and the overall paint spraying meets the quality standards of large factories. The black version obtained by the author is also quite pleasing to users, and white and pink colors can also be selected. However, since it is aimed at young users, I think we can be more bold in the design and color matching of the frame.

The quality is not good and the details are not good. According to the author's experience in cycling for many years, there is nothing to be picky about the welding process at important positions such as the head tube and the five way joint, even for ordinary bicycles of big brands at the price of 2000. If I have to say something, as a slightly perfectionist writer, I still hope to see the application of high-end bicycle weld free technology.

What is commendable is that the Dayu Intelligent Drive DYU A1 obtained by the author is equipped with the original mudguard, shelf and car support. At present, if purchased, it will also include other accessories such as car basket, which further improves the convenience of Dayu. In addition, the anti-theft problem of this light and lovely motorcycle has always been worrying. If the original factory is equipped with anti-theft devices such as motor locks and mobile alarms, the author believes that it is very necessary.

Part 3 | Folding&adjusting design

Dayu Smart Drive DYU A1 adopts a mature three-step folding design of folding bicycles. After folding, it reaches the size of an ordinary trunk, which can be easily put into the trunk of a car. As a means of connecting public transportation, it also has good portability. The overall weight of 13.6kg is not much heavier than the classic 20 inch folding car of Dayang, which is really a bit inconceivable! The following folding trilogy is shown in the dynamic diagram below:

Step 1: Expand the tubular beam. Unfold the folded horizontal tube. At this time, the power supply of the front and rear horizontal tubes will contact naturally. Then push forward the locking fastener, press it with slight force, and finally unscrew the safety buckle.

Step 2: Unfold the head tube. Unfold the head tube naturally upwards, pay attention to the harness position, then press the locking fastener upwards, and finally rotate the locking safety buckle. At this time, adjust the handlebar height as required.

Step 3: Adjust the pipe sitting height. Turn on the quick release device of the sitting tube, adjust the seat to a proper height, lock the quick release device, and gently lift the pedal to make it automatically recover.

The above is the whole process of unfolding. Folding is the same as reverse operation. It is also the first time for the demo girl to operate. It can be seen that the opening and closing of the locking device is also relatively labor-saving and tight, and the pure girl will not be too laborious, which benefits from the mature folding system design.

The handlebar locking quick release is used to fix the handlebar and adjust the inclination of the handlebar.

Handle height and steering adjustment.

Head pipe folding locking fastener.

Horizontal pipe folding locking fastener.

In terms of details, except for the folding system, all adjustable positions of the whole vehicle are fixed by quick release without any tools, which is convenient, fast and improves the applicability of different groups of people. It can be adjusted in a few simple steps to meet the needs of different users from children to adults.

Part 4 | Electric power assist system

The power system of Dayu Intelligent Drive DYU A1 is simple and complex. It is said that it is simple because only the motor can be seen. In addition, there is a power system that looks like ordinary pedal riding on the surface; That is to say, it is not as simple as we imagine to realize three power modes of manpower, power assistance and pure electric power through simple and reliable devices.

First of all, let's talk about this DTST intelligent sensor system, which is also the brain and technical core of Big Fish. This system can sense the user's riding status, automatically judge the timing of power intervention according to the pedal force, and use the set power to assist riding with electric power. Although it is not manually controlled, it does not feel obvious power surprise, To put it bluntly, there will be no sudden power intervention leading to car jumping, and the whole intervention process is smooth and natural.

The drawback is that the motor is not really silent, and some noise can be heard during cycling.

The handlebar position is the main controller of the power assist system. It seems that there is no big difference except for a display similar to a code meter. This is also a simple but not simple design that the author has always emphasized.

On the left side of the handlebar, similar to the code meter, is the power system controller, which is designed with three physical buttons: switch, up and down. The display screen can display the speed, time, mileage, electricity and other data in real time. The operator's manual of the controller is not very detailed. The author tried to set the power system gear from 0 to 5, and a total of 6 gears can be set, You can also press the key for constant speed setting.

The right thumb position is a pure electric mode controller, which is different from ordinary electric vehicles. It is a press type electronic accelerator, which is adjusted by pressing down the thumb. However, the author is surprised that sometimes the accelerator will not rebound automatically after pressing down, so it will always be in the power on state and can only be restored manually. Is it a factory set mechanical constant speed mode? I don't know. However, this design is unsafe in any case. The author once forgot to restore manually when parking, and released the brake (automatically cut off power when braking) to continue to power on the vehicle.

Part 5 | Ride&Control Experience

Because of the 14 inch wheel design, Dayuzhi DYU A1 looks very small, and the small wheel diameter cannot be compared with the large wheel diameter in the state of manual riding. Of course, Dayuzhi is not designed for long-distance riding. In addition to the "hybrid" design, the riding process is very easy and comfortable, which can fully meet the needs of urban riding comfort.

Who said that the small wheel diameter can not enjoy the feeling of speed, and the endurance speed of nearly 30km/h in the highest electric mode has almost reached the level of traditional electric vehicles.

The advantage of the power assist system is that it can automatically output power in starting, accelerating, uphill, against the wind and other environments. When you need help, it is like a "hand of God" pushing you all the time. If you ride a big fish in a mountain city like Chongqing, it will be great!

Another important reason why the author calls Dayu Smart Drive DYU A1 the spirit is its flexible handling. After the sister experienced the feeling of speed, when the author asked her to try the braking effect, the above "drift brake" appeared, which surprised the author to say what to say..... It can be seen that there is no need to pursue the "high-end" configuration of disc brake and oil brake. The V brake is also reliable and stable, just look at the road cars on the street.

Part 6 | Summary

The Dayu Smart Drive DYU A1 is a light and smart moped. The full folding design allows it to travel freely in the city like a fish. It can be compared with the excellent manufacturing technology of big brand folding cars, the super long power assisted endurance of up to 55 kilometers, and the choice of multiple power assisted modes, creating an efficient, green and fashionable travel choice for young people. Buying a folding power assisted electric bicycle at the price of a folding bicycle, Dayu Smart Drive DYU A1 is really a city car worth considering.

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