When driving a motor vehicle, is it okay for an automatic transmission to not step on the brakes and

<> we know that manual transmission cars are not allowed to not step on the clutch gear, because when the clutch is not pressed, the transmission input shaft rotates with the engine, and the two are hard connected. At this time, the gear speed difference is too large, and it is not easy to hang up. Second, even if you hang up the gear, the gear is hard, there is no buffer, and it is easy to break the gear.

And the engine suddenly adds a lot of resistance, basically the second stalls.

But automatic transmissions are different, let's take the common transmissions as an example.

1. AT gearbox (hydraulic gearbox).

The power is transmitted between the AT gearbox and the engine by the torque converter, which we can understand as an automatic manual transmission clutch, but it only has two states: semi-linkage and full combination. The transmission input shaft always follows the engine when the engine is running, but it is not hardwired at this time, and.

When the AT gearbox shifts, there is no internal gear bonding action, only clutch plate bonding, so there is no need to worry about the speed difference causing it to be out of gear.

And there is no need to worry about stalling and impact after hanging the gear, because the torque converter will slip and cushion after hanging the gear. When the power is enough, it starts to go, and if the power is not enough, the torque converter starts to slip.

Dual-clutch transmission.

This gearbox is structurally very similar to a manual gearbox, with the key being that the clutch can be completely disengaged. Generally, the clutch is completely disconnected when neutral, and even if you don't step on the brake gear, it is equivalent to stepping on the clutch gear in manual transmission. When you release the brake and press the accelerator, the transmission control system begins to control the clutch to gradually engage and complete the start.

CVT gearbox.

Some CVT transmissions rely on torque converters to transmit power between the transmission and the engine, while others rely on multi-plate clutches to transmit power. Either way, however, it does not affect the gearbox, because the CVT gearbox is essentially gearless, and the D or R gear from neutral is just a system that controls a planetary gear set clutch to select the direction of power transmission. In addition, the torque converter and multi-plate clutch can be skidding when the gear is engaged, so as to ensure that the shock is reduced and the flameout is avoided.

So theoretically, there is no problem with the automatic transmission not hitting the brakes and gearing.

But some cars can be hung from N to D without applying the brakes, and some cars cannot. For example, when my car is in neutral, I can hang D gear without stepping on the brakes, sometimes I will directly pull the handbrake in neutral when the red light is in neutral, and when the red light is about to end, I will not step on the brakes and hang D gear, and then let go of the brakes.

And some cars can't, you can't move without stepping on the brake lever in N gear. This is because the manufacturer has set up a locking mechanism in the gear lever, and they think that not stepping on the brakes and directly hanging the gear will cause the vehicle to start suddenly, which will affect safety, so they set the lock gear lever in neutral mode, and step on the brake first when you need to be in gear, and release the gear lever lock when the system receives the brake signal, and you can shift freely.

Therefore, the automatic transmission supports no brake gear from the hardware point of view, but some manufacturers will restrict you from stepping on the brake gear in the shift logic.

If it is an automatic transmission without stepping on the brakes, it is difficult to put on gear, of course, if the car is stopped and does not move, it should be possible to shift without stepping on the brakes, because there is a clutch button at the gear knob, but it is quite unsafe, so it is still standardized to operate.

Generally speaking, you need to step on the brakes from P gear to any gear, because this is a setting to ensure driving safety, otherwise the moment from P to R, the car will immediately have a backward driving force, and the handbrake strength alone may not be enough to stabilize the car, which is easy to cause danger.

This is generally not recommended as it can cause a lot of damage to the car and can cause accidents.

Hello, if you don't step on the brakes, you can hang the gear, you can first do the computer test to see if the system is faulty, you also need to check whether there is a problem with the brake switch, and whether the shift lock solenoid valve is normal.

When starting, I am afraid that the vehicle will rush forward, so I have to step on the brakes and hang the gear, for the sake of safety, there is an interlock mechanism, and the brake lock is lifted. An automatic transmission uses a planetary gear mechanism to shift gears automatically depending on the degree of accelerator pedal and vehicle speed changes. The driver only needs to control the speed of the vehicle by manipulating the accelerator pedal.

When the car starts to go, only by pressing the brake pedal can the gear lever be removed from P or N gear and into driving gear. Release the brake pedal and the car will be slow. The reason why the brakes should be applied in advance is also for the safety of the driver and the car.

Otherwise, after the engine is started, the car will move if the forward gear is engaged, and if the driver does not react enough, it is easy to collide.

Cars with automatic transmissions need to apply the brakes except for coming out of P gear.

Other normal driving gears do not need to be braked.

Just switch gears and you're good to go.

Because of the automatic transmission car, the starting brake is equivalent to the clutch, so the brakes must be applied when the gear is in gear.

Hello Automatic.

The car generally has two sets of gears.

Locking mechanism: a set is the one pressed by the thumb, when moving the gear lever from a specific gear to another gear round bridge, it must be hidden to press this button, otherwise the gear lever can not move. Of course, not all lever movements need to be pressed, such as Japanese cars.

From N to D, you can move directly without pressing this button, which varies slightly depending on the model.

Another set is the brake linkage locking mechanism: when the ignition switch is turned on, the brake switch is also turned on, the computer will turn on the gear locking solenoid valve (located in the gear guard under the gear lever), the solenoid valve is energized, that is, the gear linkage locking mechanism is opened, and the gear lever can be moved from P to other gears.

Your car may be the second set of mechanisms broken, no need to power, the locking mechanism is open, you can go to the repair station to disassemble the gear lever guard to see, and in the case of the ignition key open, repeatedly step on the brakes, listen to and observe whether the solenoid valve clicks, and then let the professionals gradually eliminate it.

This situation may be caused by a brake light switch problem or a wiring problem.

Generally speaking, because there is a locking mechanism in the gearbox of the automatic transmission, the automatic transmission car cannot be put into gear without stepping on the brakes, which can effectively avoid accidents caused by the driver's operation error.

The gears of the car are locked by a solenoid valve. If it needs to be unlocked, the controller must signal to unlock the solenoid valve. That's why most automatic transmission models have a special button on the knob to unlock it.

For safety reasons, automatic transmission models must shift gears at a standstill (except for changing D and S gears). If you change gears while driving, the gears of the gearbox may wear out, which in turn will affect the service life of the transmission.

Classification of automatic transmissions:

As of July 2019, the automatic transmissions on the market include pure automatic transmissions (5-speed automatic and 6-speed automatic), automatic manual transmissions (5-speed automatic manual transmission and 6-speed automatic manual transmission), dual-clutch transmission (7-speed dual-clutch transmission), CVT continuously variable transmission (analog 8-speed and analog 10-speed transmission), AMT (similar to manual transmission and automatic transmission, no clutch, but manual addition and decrease required), etc. The advantages and disadvantages of different types of self-repellent gears are also different, and car owners can choose according to their own needs.

It's so normal, I often don't step on the brakes and go straight to D. I am a friend of Feiyin Sensitivity, if it is helpful to you, please click to reply to Zao Hong's below, thank you!

<> automatic transmission car can not be put in gear without stepping on the brakes, such as P gear to change to other gears need to step on the brakes; N gear to D or R gear also requires braking recklessly. Automatic transmission, as the name suggests, does not require the driver to manually change gears, and the vehicle will automatically select the appropriate gear according to the speed and traffic conditions. There are six gears on a typical automatic car, from top to bottom:

p、r、n、d、s、l。

The car that drives the automatic transmission only uses the parking gear P gear, the reverse split front start gear R gear, the neutral N gear, and the forward gear D gear can fully meet the needs of the general driving base return, and if you encounter some special driving environments, you need to use other functional gears. Therefore, if you are able to choose the right way to control the controls, the car with an automatic transmission will perform better than the manual transmission.