What's the impact on the car? What is the impact on the battery?
Donghua University has a paper "Research on Some Key Technologies of Vehicle 12V Start-Stop System".
The state of charge of the battery is the "power" in the vernacular, which will continue to decline because of the frequent start and stop of the car, leading to deep discharge of the battery, just like staying up late will overdraw the body.
The discharge depth has an exponential relationship with the number of cycle life, and the influence of deep discharge cycle on battery life is greater than that of multiple shallow discharge cycles.
Therefore, when the number of invalid idle starts and stops is large, it will have a great impact on battery life.
But let's not worry too much. Just now, the paper calculated the power consumption of a 1.4L vehicle in the starting process.
Therefore, every time the car starts, the discharge depth of the battery is about 0.5%.
So once or twice occasionally, it won't have much impact on the car. Ten times is 5%, right?
It will cause slight wear.
In addition to possibly affecting the life of the battery, in the process of invalid idle start-stop, although the engine is hot-started, it will still cause slight wear.
There is a paper in the magazine Highway and Automobile Transportation, which is mentioned in the Summary of Research on Pre-lubrication Technology of Automobile Engine Starting.
Hot start refers to the start when the engine stops for a short time and the internal temperature is high.
At this time, although the fluidity of oil is good, the viscosity and adhesion of oil are poor because of the high surface temperature of friction pair of moving parts.
Oil is easy to lose and can't attach to the surface of friction pair of moving parts, so mechanical wear can't be ignored.
Yes, cooking is delicious, isn't it? It's full of "wow" as soon as it's finished. What if it is tofu? It's hot, isn't it?
Of course, compared with cold start, the wear of hot start is smaller, reducing by about 75%. Occasionally, one or two false triggers are not important.
You Fei
In addition, ineffective idle start-stop will also cause gasoline waste.
This is mainly because in the process of starting, in order to overcome the resistance between internal parts of the engine, it never walks. In order to start smoothly, we must enrich the fuel injection, that is, enrich the burning of money.
Jilin University has a paper "Study on the Adaptability of Start-Stop System under Urban Road Conditions", which contains recorded data.
Generally, every hot start of a gasoline engine car is equivalent to the fuel consumption of idling for about 5 seconds. You see, 1s means to lose.
Every time you start and stop at idle speed, stop for more than 5 seconds, and then start again, you can get your money back and start saving fuel. Of course, once in a while, it won't be a big problem.
Jilin University also has a paper "Research on Control Strategy of Idle Start-Stop System Based on Multimodal Information", and there is also a data.
A model of 1.6L is started once, with an average fuel consumption of 3.22mL, that is, dozens of drops of oil. 1000mL is equal to 1L, not much.
Don't worry too much. There are already protective measures.
Too many idle starts and stops will really affect the car. We're not worried, because the engineer knows, right? He will add some protective measures when designing the start-stop system.
For example, the Donghua University paper "Research on Some Key Technologies of Vehicle 12V Start-Stop System" mentioned just now said above.
In order to protect the battery, the start-stop system is designed to trigger the start-stop prohibition function when the charging state of the battery is detected to be lower than a certain calibration value, so it is unnecessary.
At this time, the battery no longer needs to be discharged, and the generator begins to supply power to the whole vehicle, which is called "charging" in vernacular.
Engineers also spent a lot of time on the calibration of the start-stop control system.
Jilin University has a paper "Research on Modeling, Simulation and Verification of Automobile Start-Stop System". You can tell how serious they are just by their names.
It is mentioned that in order to prevent the vehicle from frequently starting/stopping in the case of congestion, the start-stop system has a delay time setting, and the vehicle will stop for a period of time before issuing a stop request.
For example, in order to prevent people from being injured, firecrackers usually have relatively long leads. If they run away, they will beep, but they won't hit directly at one o'clock. There will be an intermission.
Even if there is really a congested road section with frequent start and stop, the engineer gave a switch to manually turn off the automatic start and stop.
The start-stop function will be more intelligent in the future.
Moreover, the automatic start-stop function is also being upgraded and improved, and a smarter and more scientific start-stop system is also being studied.
The paper "Research on Control Strategy of Idle Start-Stop System Based on Multimodal Information" mentioned just now is also mentioned above.
Multi-mode information start-stop control method based on big data and comprehensive consideration of traffic control signals.
Compared with the traditional start-stop system, the fuel economy is improved by 23. 17% and 8.79% in peak hours.
The average start and stop of invalid idle speed during peak hours decreased by 93.59%, and the average start and stop of invalid idle speed during peak hours decreased by 74. 17%.
For example, the intelligent automatic start-stop in the future will be fully automatic frequency conversion air conditioning system and fixed frequency air conditioning system, which will automatically adjust the working conditions according to the situation. There is another saying: only one degree of electricity is needed for one night.
Occasionally turn off the engine 1s will start, which has little effect on the car. Generally speaking, 1s will start when it is turned off, which does have a certain impact on the car. But once in a while, once or twice, the impact is really small. The electricity consumed by the battery is replenished in a few minutes, wasting twenty or thirty cents on oil.
Moreover, engineers are trying their best to avoid this situation. When encountering a congested road section, you can also manually turn off the start-stop system.
Why did I turn off the automatic start-stop as soon as I got on the bus? Of course, many people turn off the automatic start and stop as soon as they get on the bus, whether it is congested or not. Why?
Automatic start-stop means: "OK, it can save fuel." How much money have you saved? Do you want us to calculate?
They all said, "Automatic start-stop also hurts the battery." I'll take that as an injury. How long can a battery last? How much does it cost to change a battery? Can I change it myself?
Keywords: automatic start and stop
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