"Tianjin Automobile" journal has a paper "Treatment of EFI engine idling speed is too high or too low".
said: The engine idling speed is generally set at about 650 to 750r/min. There may be differences between different cars, but 600 to 800r/min are relatively normal.
In this interval, the lower the idle speed, the better the engine.
But if its idling speed suddenly becomes lower than usual, it doesn't mean that your car's condition suddenly becomes worse, but there may be a problem with the engine.
Under normal circumstances, the lower the idling speed is, the better
The lower the engine idling speed, the more fuel-efficient
First of all, under normal circumstances , The lower the idle speed of the engine, the more fuel-efficient it is.
South China University of Technology has a paper "Research on Torque-based Engine Idle Speed Control" which states: The lower the engine speed at idling speed, the lower the friction and pumping force, and the lower the fuel consumption.
And related experiments also show that for every 100r/min reduction in idle speed, about 0.4km per liter of oil can be increased.
The engine idling is low, which may cause flameout
But the engine idling speed cannot be too low, the engine power is equal to the speed multiplied by the speed Torque, the lower the speed, the lower the power and the weaker the anti-interference ability, which will easily cause the engine to stall directly.
may also cause vehicle vibration, noise, and affect driving comfort.
It seems that the epidemic has been quarantined, and there is not enough food at home. Then I eat a little less every day, but I have to eat or eat too little, and my body can’t take it anymore.
The epidemic is not good. I am hungry and malnourished or fainted. That's not good, right?
The engine speed is too low, and the emission pollution increases.
The engine idling speed is too low, which will also lead to increased harmful gas emissions.
Hebei University of Technology has a paper "Research on Idle Speed Control Technology of Automobile Engines".
says: the lower the idle speed, the more obvious the dilution effect of exhaust gas, the engine will provide a higher concentration of mixed gas, which will lead to incomplete combustion, HC (hydrocarbon), CO (carbon monoxide) these harmful gases coming.
is a bit like losing weight. Although you control the number of times you eat, but you eat more each time, the final effect is not good.
Therefore, many manufacturers will solve this problem by increasing the idle speed.
Low idling speed means better engine
Although the lower the idling speed, the more fuel-efficient, but it is still necessary to ensure sufficient anti-interference ability and meet emission standards Yes, these two points are inherently a bit contradictory.
For example, like playing basketball, you want to be as tall as Yao Ming, but also as fast and flexible as Iverson. This is very, very difficult.
is also precisely because of these contradictory difficulties, if there is an engine that can meet the emission standards, the anti-interference ability is still particularly strong, and the speed is also relatively low.
That shows that this engine is indeed very good, stronger than the average.
The "James" in the engine is tall enough, has some speed, and has a bit of playing skills. It is also possible to score points. Naturally, he is a relatively good player, right?
Suddenly low idling speed may be caused by an engine problem.
What we just said is normal. If it is lower than usual, it may be an engine problem.
The car usually rotates at 800 rpm and suddenly only 500 rpm. It does not mean that today the car has become awakened, understood some new principles, and has become a more powerful car.
On the contrary, there may be a problem with the engine, and idling jitter and flameout may occur.
Where may be the problem?
The engine cylinder does not do enough work
1st reason It may be that the combustion work in the engine cylinder is insufficient, and the force to push the piston is reduced, and finally the engine idling speed becomes lower.
is like riding a bicycle, your pedaling strength becomes less, the speed of the car will not slow down, "hahaha" breathe out.
There is a problem with the intake and exhaust system
causes insufficient work in the engine cylinder. First of all, it may be a problem with the intake and exhaust system Up.
Take the air intake as an example. To ensure that the car's idling speed is stable within a certain range, the trip computer adjusts the throttle opening slightly according to the current situation, but it cannot exceed a certain range.
If the engine filter is too dirty, or the intake pipe is leaking or clogged, even if the trip computer adjusts the throttle opening to be large enough, it is still not enough and it is still stuffy.
will cause insufficient combustion, and the idle speed will become lower.
There is a problem with the fuel system
A problem with the fuel system can also cause insufficient work in the engine cylinder, blockage or leakage of the oil circuit Or the fuel injection nozzle is blocked and the fuel injection is not smooth.
These conditions will lead to less fuel injection in the engine cylinder and lower combustion efficiency. The last situation presented is: the engine idling speed has become lower.
Originally, it took 10 eggs and 5 catties of flour to make a cake. Now there are only 2 eggs, so you still have to make so many cakes.
So what should I do? The taste is not as good as before and fades away.
There is a problem with the engine
The second reason why the engine idling speed is too low is likely to be the engine itself. .
The ignition coil is short-circuited or damaged, the spark plug is carbonized and damaged, and the coolant enters the engine. These conditions may cause the speed to decrease and there will be severe jitter.
Similarly, the incorrect ignition timing of the engine will also affect the idling speed. You don't need to understand what is not timing, just take a tug of war to understand.
Everyone shout 123 "Wow" and pull it, right? 123 pull it.
12 Why did someone pull first, so the strength is not concentrated? That's what it means.
Sensor, trip computer failure
The last reason for the low idling speed of the car may be related sensors or trip computer. It's broken down.
Hefei University of Technology has a paper "GDI Engine Start and Idle Speed Control Design and Experimental Research".
Because the engine idling speed control becomes moreThe more complicated it is, the engine needs to collect multiple sensor signals to comprehensively control the engine's operation.
If the sensor is used improperly or malfunctions, it will cause the engine to run abnormally or be damaged, and there are still a lot of engine-related sensors, usually more than 10.
For example: the light intake system will have three sensors for intake air flow, throttle position, and intake pipe temperature.
Therefore, the probability that the idling speed is too low due to a sensor failure is actually not small.
The information of these sensors is collected and processed by the trip computer and adjusted accordingly.
Similarly, if the trip computer fails, the instructions given are also wrong, resulting in a low idle speed, which is equivalent to closing your eyes and blindly walking a tightrope.
How much fuel will it consume after one hour of idling?
Today is the idling speed, how can I say? When it comes to idling, many friends have no way to drive out of the community due to the epidemic, or they are reluctant to drive out for fear of problems.
But I'm afraid that the car won't have electricity. We will send a round after 1 or 2 weeks, and let it go at idle speed to charge it, right? Can the battery be fully charged?
How much can I charge if I only charge for 10 minutes? How many days can it last?
In-place idling, charging over there requires fuel consumption. Is the fuel consumption high? What is the general fuel consumption when idling for 1 hour?
These materials, algorithms and templates are all sorted out for you.
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