In the past two years, many domestic manufacturers have introduced pure electric light trucks, but only a handful of them are put into market use. When the battery technology has not yet achieved a breakthrough, pure electric trucks can not avoid the problem of short cruising range. With the same battery capacity, they start with recycling energy to maximize the cruising range.

Currently there are not many pure electric trucks running on the road. Some time ago, the evaluation team of the truck home had a chance to come into contact with the Dongfeng EV300, a pure electric vehicle that was actually put into operation, and made a deeper understanding of the vehicle (City District No Limit Dongfeng EV300 electric car evaluation). The Dongfeng EV300 uses a 75kW/h ternary lithium-ion battery. According to the manufacturer's data, the maximum cruising range is 160km, and it takes 3-4 hours to fully charge using a dedicated charging pile. In order to maximize the cruising range, the Dongfeng EV300 pure electric truck is equipped with a braking energy recovery system. When the driver takes the brake, the battery's power can also be compensated.

Before the author contacted pure electric vehicles, including passenger cars and commercial vehicles, there are two ways to recover energy. One is that the brake energy recovery will only work when you step on the brake pedal; As long as the foot is away from the accelerator pedal, the energy recovery is started. At this time, the motor becomes a generator and the battery is supplemented with electric energy. The two ways of braking energy recovery are different, and the driving experience brought by it is not the same.

(Photographed during driving on an enclosed road, so the image is blurry)

The model that the truck home evaluation team experienced was the Dongfeng EV300. The brake energy recovery of this vehicle will only start when you step on the brake pedal, which means that when the driver is on the road, the driver releases the accelerator pedal. The vehicle will be in a coasting state and the motor output power will be cut off, just like an ordinary automatic transmission model. When the driver depresses the brake pedal, the brake system and the motor work in tandem, the brake system provides braking force, the electric motor changes to generator to utilize vehicle inertia to recover energy, and resistance is generated to assist vehicle braking.

The other is that when the driver releases the accelerator pedal, the energy recovery system starts to work. At this time, the vehicle will have a deceleration trend, and the deceleration force will change according to the manufacturer's tuning. At this time, the motor has become a generator. Relying on the inertia of the forward motor, the motor rotates. The magnetism generates electricity, and the motor generates resistance to decelerate the vehicle and charge the battery. At this time, the brake system does not work. When the brake pedal is depressed, the braking system cooperates with the energy recovery system. This requires a relatively complicated system control. It is necessary to adjust the strength of the braking force and energy recovery, and to maximize the energy recovery under the premise of ensuring safety. , but this way of energy recovery may require the driver to get used to it, after all, a loose throttle has a feeling of being dragged, not everyone can immediately get used to it.

Postscript:

From the policies of the past two years, it can be seen that pure electric trucks are one of the development directions of urban transport in the future, and major domestic manufacturers have also introduced their own pure electric truck products. However, the technology is not yet fully mature, and it can be seen that all are There is still a long way to go in order to put it into use in a trial period.

Holter ECG Monitoring System

Introduction

Holter ECG Monitoring Systems adopt 12-lead system of international standard, which can continuously record ECG waveform for 24-hour and analyze ECG waveform by the PC software. It is applicable for use in medical institution and community.

Analysis Software Function

1.The rate of checking RR wave up to 99.9%, which increased the accuracy of analysis without losing wave.

2.AI histogram function which can directly distinguish various abnormal ECG which can analyze faster.

3. Dynamic ECG [Channel Correct" function, which can correct mistakenly wearing that makes the analysis more accurate.

4.Lorenz and Demix analysis function, which can analyze more faster, more accurately. Single medical case can be completely analyzed in 10 min, which can reduce the physician`s work.

5.ST can be displayed in many kinds of form, which ensures that analyzing ST- Trends Diagram comprehensively, observing the whole or partial ST variety to analyze the specific area of myocardial ischemia.

6.Atrial fibrillation function can be recognized automatically and can distinguish atrial fibrillation case, give advice and generate analysis report .

7.Unique Cardiac Fatigue Index function, which can judge index of Cardiac Fatigue .High-risk groups can be found and early intervention treatment can be taken by the index, which can effectively judge the heart age and predict SCD (Sudden Cardiac Death).

8. P-wave analysis function, which can check cardiac arrhythmia (such as AVB).

9.According to the requirement of patients, options can be selected freely while printing report, which can save physician `s time

10. ECG can be printed by various forms according to the user`s requirement.

11.Pacemaker analysis function, which can analyze different pacemakers(such as AAI,VVI,DDD).

12.The comprehensive analysis system of stand-alone version with network version ,users can freely select any model.

13.Wire and wireless simultaneously transfer mode ,which reduce complicated performance.

14. Dynamic ECG and static ECG analysis system ,which reduced complex operations.

15. Time Domain and Frequency Domain function on HRV module can reflect the moderation effect of sympathetic and parasympathetic to the heart rate.

16.HRT function can predict myocardial infarction which has clinical value.

17.ST function which can check the exact time and length of myocardial ischemia in 24 hours.

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