What is a low speed shift? What is the purpose of the car rushing to put on a low gear?

Forced gear reduction, also called gear grabbing. The principle is utilizationEngine brakingDeceleration, generally used when the brakes fail or the brake wheels fail. That is, to enterGearsSpeeds that are not suitable, such as if you want to cut into 3rd or even 2nd gear at a speed of 80 km/h, you need to operate with both feet away from the legal operation at the same timeNeutralTime and space hit the throttle to facilitate smooth gear shifting.

Don't care what the current gear is, according to the driving needs or road conditions to step on the brake pedal for emergency deceleration, if the engine does not tremble (commonly known as drag gear, at this time the engine speed and gear are seriously inconsistent) do not need to press the clutch pedal, if you need to step on the brakes or feel the engine tremble, at the same time to press the clutch pedal, so as not to suffocate the engine. After that, change to the appropriate gear according to the speed.

Will this damage the engine. It can be judged in this way: for example, whether the maximum allowable speed of the engine can adapt to this gear, such as:

The maximum engine speed in 2nd gear can reach up to 60 km/h, and if you change from high gear to 2nd gear at 80kmh, the result will be that the engine speed will exceed the red line, which will inevitably damage the engine. If the throttle is not accurate when the two feet clutch force downshift, the gear shift cannot be smoothly realized, causing impact and damage to the gearbox.

Cogs. There are three specific steps to grab a file:

Operation steps: 1. Brake failure.

2. Puncture of brake wheels. At this time, don't panic, don't mess around, try to stabilize the direction, use downshift to slow down, and finally stop the car.

3. The vehicle goes down a long steep slope. The downhill speed is too high, so you need to slow down sharply and press the brake pedal.

At the same time, quickly shift the car's gear from high to low in order to use engine braking to reduce the speed of the car.

4. Ice and snow weather. The road surface is very slippery, and when you need to slow down, stepping on the brakes is very likely to cause "drifting" out of control, and it is safe and feasible to slow down in gear.

You have brake failure, then to take effective measures in the shortest possible time, and can not be a gear to reduce the low, now the manual gear has a synchronizer, you can directly enter the low gear from the high-end, the low-speed speed is low-torque, you can reduce the high-speed vehicle from the high-speed to the low-speed, the general situation is best not to use such a method.

The speed of the fourth gear is attached to the third gear or even the second gear, and the speed will be dragged down by the engine, and the intercourse is not a hard connection, even if it is stuck in the low gear, the braking effect may not be obvious. At this time, it is better to get stuck in L or S gear as much as possible to let the engine brake as much as possible.

First of all, I understand that gear rush deceleration refers to the operation of deceleration by actively downshifting while driving. Manual transmissions have two ways to operate depending on the driver's ability: pressing the accelerator and not pressing the accelerator.

The maximum speed of the engine will not be off, each car is different, the upper speed limit of most family cars is about 7000rpm (7000 rpm in the round slag state), I estimate that the vast majority of people have not experienced the car to the upper limit of the engine speed, right? I used to have a car with a tachometer number capped at 8,000 rpm, and I would often drive to 7,300 in second gear for a short period of time.

Because it is more dangerous to drive two cars side by side, whether it is parallel to a large car or a small car. Once an accident occurs in the car next to him, the direction suddenly hits, and Liang Shen can't dodge, and he wants to avoid the obstacles in front of him, but he has nowhere to hit the direction. The other two vehicles in parallel will be disturbed by the air flow pushed by the other vehicle, making the vehicle unstable.

The gearbox is used to coax the bear child of the internal combustion engine. In principle, angel motors do not require multi-stage gearboxes.

The reason why the internal combustion engine is a bear child is mainly due to the fact that it is only willing to exert force within a certain speed range, beyond this speed range, sorry, the uncle is lazy. Here is a diagram of the engine.

Be alarmed. Probably antifreeze. "Antifreeze" is used to freeze and cool the engine, not for drinking or cleaning glass, the ratio of ethylene glycol to glycol antifreeze determines the freezing point of antifreeze; Buy antifreeze in the following order:

Buy the "antifreeze" model indicated in the maintenance manual", buy the "antifreeze" with the same color and freezing point, buy the three "antifreeze" without lactose, comfort me, if all can be mixed with any color of the station's "antifreeze".

When descending a long steep slope, quickly shift from high to low and brake downhill with low gear. This process is called grasping and decelerating.

Generally, in emergency situations such as punctures and brake failures. We will use the method of grasping and decelerating. Back to the town.

When going downhill normally, it is recommended to downshift in advance to achieve step-by-step downshifts and protect the engine and transmission accessories.

Let's talk about how to grab and slow down when the brake fluid fails.

1. Manual transmission car:

1.Stay calm, choose a road with fewer people and a wide road, and avoid dangerous objects.

2.Step on the accelerator deeply, let the speed go up, go back, step on the accelerator again, then retreat, and gradually return to the low gear leakage.

2. Automatic vehicles:

The transmissions of automatic transmission vehicles are mostly fluid coupling transmissions, dual-clutch transmissions, etc.

For fluid coupling transmissions, gears can be snapped in L or S to maximize the braking effect of the engine.

For dual-clutch transmissions, manual mode is generally provided, with a manual transmission according to the operating requirements of the car.

It should be noted here that during the downshift process, the handbrake can be used appropriately, but do not directly pull the handbrake, because it is easy to roll over at high speeds.

Millions of car purchase subsidies.

On long steep slopes, quickly shift from high to low and brake downhill with low brakes. This process is called sliding gear deceleration.

In most emergency situations, such as tire bursts and brake failures. We're only going to use gear rush to slow down.

When going downhill normally, it is recommended to downshift in advance to achieve step-by-step downshift to ensure engine and transmission accessories.

Let's talk about brake failure first, how to grab gear and slow down.

First of all, manual transmission cars.

1.Stay calm, choose a road with little width, and avoid dangerous things.

2.Press the throttle deeply, let the speed go up, reverse gear, step on the accelerator, reverse gear, and gradually push to low gear.

2. Automatic transmission vehicles.

The gearboxes of automatic transmission vehicles are mostly fluid coupling gearboxes, dual-clutch transmissions, etc.

In the case of the fluid coupling gearbox, the gears can be stuck in L or S gear, allowing the engine to maximize the braking effect.

In the case of dual-clutch transmissions, most of them are equipped with manual mode, and the car can be operated according to the manual transmission.

It should be noted here that in the process of downshifting, the handbrake can be used moderately, but you must not directly pull the handbrake, because it is easy to roll over at high speeds.

The above is an introduction to what is grab deceleration. I hope Bian Xiao's introduction today can help everyone. If you like it, give Bian Xiao a compliment. This is the biggest support for Bian Xiao.

When the vehicle is driving at high speed or normally, and encounters a brake system failure (i.e., unable to brake and slow down), it must use the low-speed gear to slow down and avoid danger. The other is that novices are not skilled in shifting from high speed to low gear (this is not a rush gear, it is a wrong gear) and unreasonable.

At the beginning, of course! There is no doubt about the answer.

Generally, cars are forced to low-gear, mainly for the following reasons:

1. Air brakes, trucks, to prevent the air pressure from dropping or the wheel hub from overheating, resulting in brake failure.

2. In rainy and snowy days, the way is skidding due to braking.

3. The brakes are not good, and the speed is quickly reduced with low gear.

Under normal circumstances, it will not be used to hang the low-grade one.