How to prevent slipping when starting from a steep slope in automatic transmission

For automatic transmission vehicles without hill assist, the easiest and most effective way to prevent rolling is still to use the hand brake to achieve a smooth start of the vehicle. When starting, first supply fuel to the vehicle, with the front of the car upturned, and when the hand brake lever is light, slowly release the hand brake to prevent the vehicle from slipping backwards.

Second, when the automatic transmission car starts on a ramp, in order to prevent the vehicle from slipping backwards, it can quickly move the right foot to the accelerator pedal at the moment of releasing the brake pedal, and increase the fuel supply of the fuel injection system to prevent the vehicle from slipping.

That. 3. In order to prevent the vehicle from slipping back when the automatic transmission car starts on the ramp, the root of the right foot can be used to control the brake pedal, and the accelerator pedal is controlled by the toe of the right foot, and the vehicle is supplied with fuel in advance, and then the brake pedal is slowly lifted to achieve a smooth start of the vehicle.

Fourth, use the left foot to control the brake pedal, free up the right foot to control the accelerator pedal, with the engine speed to rise, and then slowly release the brake pedal when the vehicle is obviously forward, so as to prevent the vehicle from slipping back when starting, and realize the smooth start of the vehicle.

When it comes to ramp slipping, it is probably a problem that every novice driver will encounter, especially the manual transmission car, which is even more difficult to control, and I am worried that it will slip or stall.

First of all, when the automatic transmission is on the uphill section, you must pay attention to tighten the handbrake before starting, and press the brake pedal with your right foot to start the car.

When starting, the gears of the automatic transmission vehicle should be clearly divided. I think there is also a difference in the gears of the automatic transmission car. When the vehicle is ready to start, you should pay attention to the brakes first, then put it into N gear, then ignite it, and then put it into D gear from N gear, release the brake, lift the foot brake and start to start.

Friends can also simply remember to only remember to mark the high gear with D, that is, don't hang the D gear at the beginning.

Although many cars have an electronic handbrake, but the mechanical handbrake is still equipped in some low-end models, if the mechanical handbrake, when starting on the ramp, you can start, do not hurriedly let go of the handbrake, first step on the accelerator slowly, and when the car jumps forward slightly, and then slowly put the handbrake down. If you hurriedly let go of the handbrake, and then switch your foot from the brake to the accelerator, this is still a little bit for novices, this degree is not very easy to control, and it is not good that when you release the footbrake, the car will slide backwards.

Since you want to avoid slipping, you must first understand the reason for slipping. We all know that we all loosen the clutch first, and then release the brakes after the forward driving force of the car counteracts the backward gravity.

However, there is no clutch in the automatic transmission, and after stepping on the brake, the clutch will automatically disconnect or the combination force is very small, and the general small ramp may be able to cope with the slipping when hanging D gear, but it is easy to slip when encountering a large slope (such as driving out of the underground parking lot). This is because there is a time interval between changing from the brake pedal to the accelerator pedal, and even if the accelerator pedal is pressed, it will take another time interval for the car's driving force to increase enough to counteract gravity.

1. Manipulator brake type.

If your car's handbrake is not an electronic handbrake but a mechanical handbrake, it's very simple, tighten the handbrake first when parking on a ramp, and then release the brake pedal to step on the accelerator, and when the body shakes forward or drives forward slowly, release the handbrake.

2. Electronic hand brake type.

The electronic handbrake is relatively troublesome, and if the electronic handbrake wants to release, it must first step on the brake, so it is impossible to step on the accelerator first and then release the handbrake like the mechanical handbrake. You can only apply the brakes with your left foot and the accelerator with your right foot when you are going uphill, and then release the brake pedal when the forward driving force of the vehicle is sufficient, which is somewhat similar to a catapult start. In addition, it is really awkward to press the brake pedal on the right side with your left foot.

3. Auto Hold

An important reason for the emergence of auto hold is to prevent ramp slipping, but we found that many car owners will not use autohold. When stopping on a ramp, turn on Auto Hold and automatically pull the handbrake, just press the accelerator when starting, and automatically send the handbrake when the vehicle detects that the wheels are rolling forward, so as to prevent rolling. However, it is not recommended to use it on flat roads, because the electronic parking brake takes about 2 seconds to open and close, which is really inconvenient when driving in urban areas, and repeated braking also brings a great burden to the brake cylinder.

Many novice drivers are worried that it is particularly easy to slip when starting uphill when they first start driving, especially if the automatic transmission car does not have hill assist, it is easy to slip when the brake throttle is switched, so we can take the following two ways to operate. 1. Because the automatic transmission car does not have a clutch pedal, it can be used with two feet, that is: press the brake with the left foot, lightly step on the accelerator with the right foot, and slowly lift the foot brake when the vehicle has the feeling of impulse to move forward.

2. Handbrake with start: tighten the hand brake and slowly lift the brake pedal. Gently press the accelerator pedal and slowly relax the hand brake when you feel the car tilt up.

Immediately refuel the brakes after releasing them.

The automatic transmission vehicle needs to turn on the auto hold function of the vehicle to prevent backward slip on the ramp, this function is the automatic parking function of the vehicle, and it will automatically enter the handbrake mode when the brake pedal is pressed to stop the vehicle, so as to prevent the vehicle from slipping backwards when the power is connected, and the specific operation steps to turn on the auto hold function are as follows:

1. Press the brake pedal of the automatic transmission car.

2. Press the one-button start button of the automatic transmission car.

3. The instrument of the automatic transmission car lights up, and the power supply of the whole car is turned on.

4. Press the Auto Hold button located in the automatic transmission car to turn on the automatic parking mode of the vehicle.

5. At this time, the automatic transmission car will not roll when parking on the ramp.

Clause.

1. When the automatic transmission is in the uphill section, you must pay attention to tightening the handbrake before starting, and the starting car must press the brake pedal with your right foot, and you can start the car only after everything is ready;

Clause. Second, when starting to start, the automatic transmission car should be clearly divided into gears, in fact, the automatic transmission model also has a difference between the high and low gears, we should pay attention to the car is ready to start when the brakes first, and then hang to the n gear, and then ignition, and then hang from the n gear into the d gear, release the handbrake, lift the foot brake, and start to start. You can also simply memorize and remember that the high gear is marked with D, that is, do not hang D gear when you start.

Clause. Third, the automatic transmission car gear is explained, at this time all ready, at this time you can release the brake, while paying attention to the right foot on the accelerator pedal, and then slowly refueling under the foot, while the right hand slowly put down the handbrake.

Clause. Fourth, we need to pay attention to the downhill is also to use a low gear, automatic transmission models can hang the P gear, but when going downhill, do not step on the accelerator pedal, as long as the inertia of the car downhill, but the right foot should be placed on the brake pedal to control the speed to ensure the safety of driving.

There will be differences between the automatic transmission car and the manual car ramp start, the main difference is the clutch and gearbox, when the two cars start on the ramp, the automatic transmission is more difficult, and the gear is not easy to hang into the D gear when starting, and the automatic transmission is seriously harmful if it is forcibly hooked in, and even will lead to the scrapping of the entire gearbox, and the correct way to encounter a similar situation is:

When the automatic transmission car stops on the ramp, it is necessary to brake its own vehicle, put the gear into the n gear, and at this time pull the handbrake to brake, and at the same time release the foot brake;

Wait for the automatic car to stabilize and engage in P gear, so that the car will stabilize.

There are three ways to prevent slipping: 1. Replace the brake pedal with the left foot to step on, step on the accelerator with the right foot, increase the speed to more than 3000 and send the brake with the left foot, basically will not slip, but because the foot brake is braked by four wheels at the same time, the drive wheel is locked and the accelerator is stepped on at the same time, theoretically it may damage the gears of the gearbox. 2. Pull up the handbrake, release the foot brake and gas pedal, and add to a certain speed to release the handbrake to start, which is similar to the half-slope starting principle of the handwave car, because the handbrake locks the rear wheel, so it should not damage the gearbox.

3. "Hovering" - completely release the throttle before approaching the toll booth, but do not step on the brakes, when the force of the vehicle is completely gone, slow the accelerator, at this time the gravity pull force and engine power are in a balanced state, the vehicle can be completely parked on the slope, and do not need to step on the brakes and pull the handbrake, the charge is finished and the fuel pedal is directly on the line, no need to use the brake at all, this operation method has high requirements for the control of the throttle of the driving car, if it is a handwave car, it is more difficult, The master can stop on the half-slope without braking with only the oil off-the-plate, and the automatic wave is relatively simpler, only need to operate the throttle.

AT, CVT through the torque converter torque increase will not slip, AMT, DCT equivalent to manual transmission, so there will be a certain degree of slipping, can only be prevented by the left foot brake or handbrake.

A handbrake can be used to prevent rolling. At the start of the ramp, you can pull the handbrake first, and then step on the accelerator, when the front of the car is upturned and you feel that the car is going forward, you can put down the handbrake and continue to press the accelerator.

At this time, it can be a good solution to the situation of slipping on steep slopes.

The parking brake, that is, the manual brake installed by the vehicle, referred to as the hand brake, is mainly used to stabilize the vehicle after the vehicle is stopped, so as to avoid traffic accidents caused by rolling when the vehicle is parked on the slope.

When using the handbrake, there are the following points to pay attention to: First, the handbrake cannot be used to replace the foot brake at high speed, because the handbrake is mainly used to control the rear wheel, and it is easy to overturn when pulling the handbrake brake at high speed, so it is dangerous to shout at non-cherry blossoms; Second, don't forget to pull the handbrake when the traffic is jammed on the slope, because it will be easy to slip and it is very dangerous; Third, do not run with the handbrake, which will cause a large loss of the brake ridge and the wild car, which will lead to a decline in braking performance.

Millions of car purchase subsidies.

There are three ways to climb and prevent slip in automatic transmission:

1. Change the brake pedal to the left foot to step on, step on the accelerator with the right foot, increase the speed to more than 3000 and release the brake with the left foot, but because the foot brake is braked by four wheels at the same time, the drive wheel is locked and the accelerator is stepped on at the same time, which may theoretically damage the gearbox gear.

2. Pull up the handbrake, release the foot brake and fuel the accelerator, add to a certain speed and release the handbrake to start, which is similar to the half-slope starting principle of the handwave car, because the handbrake is to lock the rear wheel, so it will not damage the gearbox.

3. "Hovering", completely release the accelerator before approaching the toll booth, but do not step on the brakes, when the force of the vehicle is completely gone, slow down the accelerator, at this time the gravity pull force and the engine power are in a balanced state, the vehicle can be completely parked on the slope, and there is no need to step on the brakes and pull the handbrake.

Electronic Parking Brake:

If the car is equipped with an electronic parking brake, it cannot be operated in the above ways. Because the electronic handbrake must first press the brake if you want to release, it is not possible to press the accelerator first and then release the handbrake like the mechanical handbrake. At this point, you can only follow the steps below.

1. Step on the brake, hook into the corresponding gear, and then slowly release the brake.

2. After confirming that the car will not slip, step on the accelerator to replenish the power.

3. It is worth noting that the process of turning to step on the accelerator after releasing the brake should be as fast as possible to avoid the car slipping backwards.

Step on the gas.

In fact, during the development of automatic transmission vehicles, there is a special criterion that no rolling occurs at the start of a ramp. In other words, if the owner's vehicle is slipping, it means that the development process of the car is not up to par and needs to be remanufactured.

In order to suppress the phenomenon of vehicle ramp start rolling, the current vehicles have developed the autohold function, the hill start assist function, which works in combination with the vehicle's braking system, and the braking system will judge the braking force required by the vehicle according to the slope of the road.

When the owner does not step on the brakes, the braking system will also apply braking force according to the predicted force to prevent the vehicle from rolling, and the braking force will be automatically eliminated after the owner steps on the accelerator.

In order to prevent the vehicle from slipping on the ramp, the braking force elimination time point must be strictly controlled, only when the output torque of the engine is transmitted to the wheels, and the driving force of the wheels is greater than the resistance of the vehicle along the ramp downward, the braking force can be eliminated, in this case, the vehicle will not slip phenomenon.

Analysis of the causes of vehicle ramp starting.

However, we do not rule out some special Chinese cars, or models that reduce costs and increase efficiency, the vehicle itself does not have a ramp start assist function, nor does it have an autohold function, such a vehicle, when the ramp starts, it is inevitable that there will be a rollover phenomenon.

The main reason is that after the owner releases the brake, the braking force is instantly zero, and the owner steps on the accelerator at this time, the engine speed rises, and the engine torque can not be transmitted to the transmission immediately, after all, the transmission gear combination also takes time, that is to say, the instantaneous driving force of the vehicle tire is very small, less than the resistance of the vehicle along the ramp downward, at this time, the automatic transmission vehicle will slip.

This phenomenon of rolling in the vehicle has little to do with the gear (L S gear), which is a normal phenomenon, so the problem of rolling cannot be solved by switching gears.

How do car owners solve the problem of starting and slipping?

The car is dead, but the person is alive, and the owner can give full play to his ingenuity and drive the vehicle according to his own experience, which can suppress the phenomenon of slipping. We all know that Autohold and Hill Start Assist both use the braking system to control the phenomenon of vehicle ramp rolling, and the owner can use the handbrake system to start on the ramp.

The owner drives the vehicle in D gear, first step on the accelerator, the engine speed rises, the engine torque is transmitted to the wheels through the transmission, and when the vehicle has a tendency to move upward, the owner releases the handbrake, and the vehicle will immediately move forward without slipping.

With the thrifty cost of vehicles, many automatic transmission vehicles will also slip away, car owners must carefully screen their cars, whether there are similar problems to prevent traffic accidents.