When the automatic vehicle is parked, how should the owner operate? I believe that more than 99% of car owners will answer "directly hang the P gear, and then pull the handbrake", seemingly conventional operation, in fact, there is a huge risk, a little careless, the transmission will be damaged! I can use practical experience to answer the questions in detail for you!
Hang the P gear first and then pull the handbrake, which is easy to damage the transmission
6 years ago, I drove an automatic vehicle (American car), when going out to run errands, due to the tight time, the government department will be off work, with an anxious mood to drive to the parking lot, when the vehicle has not stopped, immediately "hang up the P gear", only to hear the bottom of the vehicle appear "gag" a strange sound, very crisp that feeling, but I did not think much, wait until things are done, drive home, at this time found that the transmission can not be changed from P gear to D gear, find the trailer company to drag the vehicle to the 4S shop, after inspection found, The pawl of the P-stop breaks and the transmission enters self-protecting mode. This is a bloody case, through this incident I learned that automatic vehicle parking has skills, the owner can not do it arbitrarily.
You can try to drive your own car, in the case of low speed into the P gear, due to the forced mechanical coupling of the transmission, the vehicle will definitely be locked in an instant, and there will also be a phenomenon of front and back. The reason for this situation is that the ratchet and the pawl of the P block instantly mesh, the driving wheel of the vehicle is locked instantaneously, at this time, the vehicle is traveling at a certain speed, although its speed is very low, but the weight of the vehicle is very heavy, which also leads to the kinetic energy of the vehicle is very large, the powerful energy all acts to the ratchet and the pawl position, it is easy to cause the ratchet or pawl to break.
Correct parking habits
In order to overcome the above phenomenon, the owner should maintain good parking habits, when the owner stops, he should first step on the brakes until the vehicle is stable, and then pull the handbrake, and then hang the P gear. This practice has two major benefits: 1. 2. Help car owners develop the good habit of "parking the vehicle and then hanging up the gear"; Pulling the handbrake first locks the drive wheels and prevents the vehicle from impacting the P-stop ratchet and pawls.
In fact, the above parking principle has been used by automotive engineers. We all know that with the continuous development of automotive technology, mechanical handbrake has become less and less, gradually replaced by electronic handbrake, the control process of electronic handbrake is relatively flexible, for some grades of more high-end vehicles, when the owner hangs up the P stop, the electronic handbrake will work at the same time, it can effectively avoid the impact of the vehicle on the P block ratchet and the pawl; if the vehicle has not been stopped, when stopping at a certain speed, the owner hangs the P gear in this case, it is likely to appear two situations: 1. P block can not hang, 2. The electronic handbrake will take the lead in the work, holding the wheels directly to death, and after the vehicle is parked, the transmission can switch to P gear.
In summary, the correct way to park should be that the owner first stops the vehicle, the speed is zero, and then pulls the handbrake to hang the P gear, and then turns off the car.