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The engine start-stop technology, as the name suggests, is a system that automatically restarts the engine when the vehicle is temporarily parked while driving. The engine start-stop technology, as the name suggests, is a system that automatically restarts the engine when the vehicle is temporarily parked while driving. For models equipped with automatic transmission, the engine start-stop system works as follows: as long as the brake pedal is directly pressed during driving, the engine will automatically stop after about two seconds of stopping the vehicle, and the engine will remain on the brake pedal. shut down. As soon as the brakes are released, or the steering wheel is turned, the engine will automatically ignite immediately, and the accelerator can be started immediately. The whole process is in the D position. In order to solve the problem of being too tired to brake on the brakes, as long as the AUTO HOLD electronic handbrake is also turned on, the engine will only start after the accelerator pedal is lightly pressed, and the right foot does not need to always brake the brakes. For the manual transmission model, the driver will step on the clutch and the start-stop system will start.
Engine start-stop technology is one of the more rapid development of automotive environmental technologies in Japan and Europe in recent years. So far, most of the new models introduced by major manufacturers have been equipped with this technology. In theory, this system can save 15% of fuel consumption for models that often travel in urban areas. With the introduction of domestic mandatory fuel consumption standards, just like a sword of Damocles hanging high above the heads of independent manufacturers, this technology is quickly promoted in China.
Regarding this system, many people must have the following doubts as I have just come into contact with this technology: 1. The ignition process itself is more expensive, how can this technology save fuel? 2. Frequent ignition increases engine wear? 3. Frequent ignition shortens the life of batteries and starters? Before answering this question, the first thing to say is to send an automatic start-stop system. When the engine temperature does not reach the appropriate start-stop temperature, or the ambient temperature will cause the engine start-up process to be affected, the start-stop device will not start, or the start-up frequency is very small. When the temperature of the whole car can reach the system requirements, it can be normally activated. Such a mechanism is called a low temperature protection mechanism. Now the problem is easier to explain. The hot car ignition process is not as expensive as the cold start. The automatic start-stop technology is mainly used in traffic jam situations. In most cases, the engine is hot, and the hot car engine is usually It can be started at 350 rpm, which is half lower than the idle speed. It is assumed that there is no load other than the internal resistance and the loss of the necessary equipment such as the gearbox, and the fuel consumption is definitely less than the idle speed. Problem 2: The inside of the engine is mainly lubricated by the oil film. Since the time of automatic start and stop is very short, the oil that is pumped up by the oil pump will not flow back. The parts still retain a lot of oil, in the case of starting and hot start. It has little effect on the wear of the engine. The real wear and tear on the engine is cold start and high temperature conditions. Of course, for all models, the use of good quality oil is sure to better protect the engine's cylinder. Question 3: This problem does exist. Therefore, the solution strategy for the European model represented by Volkswagen is to use a starter battery with a faster charging and discharging current and a reinforced starter, which is longer than the life of a conventional starter. 4 times. The capacitor battery used by the Japanese machine represented by Mazda is combined with the ignition strategy of the direct injection engine to reduce the starter load. 
Mazda's I-STOP system is quite sincere 
Every time the flame is turned off, there is a cylinder that just stops at the compression stroke (for example, the 4-cylinder machine). After solving these doubts, is it really perfect to start and stop the system? First of all, we must affirm his advantages: 1. Save fuel, the theoretical fuel saving rate can reach 15% under urban road conditions. 2, high efficiency and environmental protection, traffic lights such as traffic lights in the flameout state are zero. 3. When the parking state is turned off, the engine is protected, the carbon in the engine is reduced, the engine idle wear is reduced, and the engine life is prolonged. 4, traffic jams are not blocked, in the red light and long traffic jams, to bring you a peace and ease. 5, start-stop type will generally be equipped with car battery power monitoring and warning, no longer have to worry about the battery power failure. However, in terms of current oil prices, starting and stopping is fuel-efficient and not cost-effective. In theory, assuming that the engine is continuously started and turned off within 1 minute, the fuel consumption will be higher than the normal idle speed, but the flameout will start once in a minute, and the fuel consumption must be lower than the idle fuel consumption. The engine's hot start fuel consumption is 1.5 times the normal idle consumption, and the engine cold start is 0.5 times higher than the hot start. Taking the displacement of the current domestic household model power range of 1,5~2.5L to take the middle value of 2L, the theoretical data is: idle fuel consumption 1 liter / hour, converted to idle speed 10 seconds consume 5.5 ml, start once (5 seconds) fuel consumption is 4.125 ml, which means you will earn even if it is turned off for 10 seconds. Wait an average of 40 seconds for a traffic light, see the table below: 
At present, the models that start and stop the whole system are generally more than 5K. According to the comprehensive suburban conditions of 50KM, I am going to work every day. The number of red lights per day is about 10. According to the current oil price, the start-stop has brought me about 300 yuan of oil money, which takes about 15 years. In order to return to this, it is also necessary to ensure that the battery and the starter do not malfunction. Seeing such data, I suddenly want to say: "Is this TM funny?" Of course, when the oil price becomes 20 or 50 liters a day, it is another matter. There are many restrictions on the opening and closing of the start and stop: 1. After the cold car is started, the water temperature does not come up, and the start and stop will not open. (Generally 70 degrees is bounded) 2. The temperature outside the car is lower than 5 degrees, or it is less than 20 degrees in the hot windmill. It is not turned on when the cold air is higher than the set temperature by 1 degree. 3. When the battery is low (less than 60%), it will not be turned on. 4. When the steering wheel angle is greater than 30 degrees, it will not be turned on. 5. When the front seat belt is not fast, it will not open. 6. When the ramp stops (such as 10%+ slope), For vehicles that are not equipped with an electronic handbrake, the foot must also be stepped on the brakes; when the traffic jam stops in the urban area (the car without intelligent judgment, it must be manually closed, otherwise it will hurt the egg); The field, high-speed brush card, stop for 3 or 4 seconds, the engine has just left the train to go, this situation will be extremely redundant when starting and stopping. Therefore, this set of seemingly beautiful environmental protection system is not a delicious chicken leg for most people in daily use, but it is a pity that it is a pity. Http://?&fid=55&id=1842
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