When driving an automatic transmission, when waiting for the red light, whether it is on the D gear and stepping on the brake or the N gear and pulling the handbrake, it will not harm the car.
As for which method is better, it mainly depends on the time to wait for the red light.
hang D gear and brake will not damage the gearbox
Many friends will feel the car shaking when they hang D gear and brake. At this time, they are worried: the engine and the gearbox are competing with each other, will it cause the gearbox to be damaged?
In fact, this kind of worry is unnecessary. The AT gearbox and most CVT gearboxes are not rigidly connected to the with the engine, but are driven by the torque converter.
Chen Changgeng published a paper on " Automotive Practical Technology ", "Research on the Principle of Torque Converter for Automatic Transmissions".
: The engine drives the impeller of the torque converter to rotate, and by agitation of the hydraulic oil , it drives the rotation of the gearbox input.
You just understand this: 2 electric fans, 1 electric fan blew the wind out, the other electric fan was originally motionless, the wind was blown to the other electric fan, and then it turned.
When we step on the brake, it is equivalent to turning the electric fan behind. Don’t let it move. At this time, it is nothing more than the wind blowing out has been wasted.
The reason why the car shakes is because the torque converter is still working, and the pump wheel inside constantly stirs the oil, which will cause slight shake.
dual-clutch transmission has different structures, but the principles are similar. When you stop completely and step on the brakes, the clutch will also separate, so there is no need to worry about damaging the transmission.
From a safety perspective, it is better to pull the handbrake with N gear
Since both operation methods do not harm the car, which one is better?
First of all, from the perspective of rationality and absolute safety, it is definitely better to hang N gears, neutral gears, and pull the handbrake. With D gear on the brake, our feet need to be stepped on the brake all the time.
Huang Qiuju, Feng Shumin and others published a paper in "Journal of Harbin Institute of Technology ", "Rules of Drivers' Foot Manipulation Behavior under Natural Driving Conditions". An experiment was conducted in
: I found that when I stepped on the brake, the force applied to the brake pedal was about 26~42N.
Even if it is 26N, it is almost the effort that we need to lift something weighing 5 pounds. It should be easier to step on it, but it is unrealistic to say that you don’t have any strength.
If you wait for the red light for a long time and your feet get sore, you may not even realize the brakes and unconsciously release them. The car slides forward, which is at risk of rear-end collision.
In this case, the safest thing to do is to hang N gear.
The red light time is short, and it is more convenient to hang D gear and step on the brake
, but in terms of actual driving convenience, hang N gear and pull the handbrake, you need to operate many additional actions on the hand.
does not have D gear, so it is so convenient to step on the brake. How can I know if the red light is 5 seconds or the next second can leave immediately, right?
Of course, if there is also the automatic parking function on the car, it is Auto Hold. Even if the red light is long, we can consider not switching to N gears.
Because after turning on the automatic parking, the brake was put on, and the car was parked there.
Even if it is hung on D gear, the automatic parking system will apply brake pressure, and we don’t have to step on the brakes all the time, so there will naturally be no safety hazards.
Wait until the traffic light turns green, give it a little oil, and the automatic parking will be automatically lifted, and the car can drive normally.Is it easy to use
to directly hang P block
In general, in addition to the two situations mentioned above, it is also possible to directly hang P block till it is easy to use this method?
If I get P gear in, a car behind me will be driven back to me. Will I lose the gearbox? Will insurance companies lose money clearly? We have shared these in the past. Interested friends can search for my previous videos on the homepage. If you have any questions about the daily use of other automatic transmission models, you are also welcome to leave a message in the comment area.
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