Why does the car need to step on the clutch before starting, and why does the engine stall if it doe

While the car is in motion, the engine remains running. It is a continuous and uninterrupted process for the driving teeth to receive the power transmitted to the driven teeth. At this point, the force of the main and slave gears occluding each other is very large (you can imagine a car weighing at least a ton or more), there is no way to change the driven gear to adjust the speed, and the engine must be turned off (i.e. stopped) to replace it.

It is very troublesome and not maneuverable (if you directly change the high-speed ratio driven gear, the torque is too small to start, similar to the lever principle, the speed must be gradually increased). So, people thought, is there a way to temporarily disconnect from the power output of the engine when it is necessary to change gears? Thus, the clutch was invented.

A clutch, as the name suggests, is a device that disengages and closes the output power of an engine. At present, the most commonly used clutch, simply put, is divided into two parts: driving disc and driven disc. The drive disc (i.e. the engine flywheel) is connected to the engine crankshaft, and the driven disc is connected to the gearbox drive gear by a spline (spline retractable).

The driven disc relies on the spring to press tightly on the flywheel to receive engine power and transmit it to the gearbox driving teeth. When we press the clutch pedal during driving, it is actually acting on the driven disc through a set of lever system, so that it can overcome the pressure of the spring and get out of the flywheel, so as to achieve the release of engine power. When the pedal is released, the driven disc presses the flywheel under the action of the spring to continue to transmit power.

The car should be started in neutral mode, do not step on the clutch to hang the gear, when just the moment of the gear, the engine suddenly changes from the idle no-load state to the load state, the engine's control system has no time to adjust, so it is easy for the engine to turn off, if the accelerator increases the engine speed and then put the gear, the engine may not turn off, but the car will swoop.

The car is turned off and restarted, and there is no need to press the clutch to engage neutral.

The specific operation steps for restarting the car after it is turned off are as follows:

1. Press the brake pedal of the car.

2. Press the car's one-button start button.

3. The instrument of the car lights up and the vehicle starts.

4. Put the automatic gear lever of the car in the P position, which is a long-term parking gear.

5. Put the car's automatic gear lever in the R position and enter reverse mode.

6. Put the automatic gear lever of the car in the n position and enter neutral.

7. Put the automatic gear lever of the car in the D position and enter the automatic mode.

8. Gently press the accelerator of the car, and the vehicle will start.

Restart the car after turning off, you don't need to step on the clutch to hang neutral, and the specific operation steps for restarting the car after turning off are as follows:

1. Press the brake pedal of the car.

2. Press the car's one-button start button.

3. The instrument of the car lights up and the vehicle starts.

4. Put the automatic gear lever of the car in the P position, which is a long-term parking gear.

5. Put the car's automatic gear lever in the R position and enter reverse mode.

6. Put the automatic gear lever of the car in the n position and enter neutral.

7. Put the automatic gear lever of the car in the D position and enter the automatic mode.

8. Gently press the accelerator of the car, and the vehicle will start.

If you hang in neutral, you don't have to step on the clutch, because the gear has been taken off, and as long as you step on the brakes, you won't slip.

If you step on the clutch, look at what the situation, for example, to wait for a long time to prevent emergencies, it is best to take off the gear and hang it when it starts.

If it's just that the car in front of you is slow, just wait a minute, and you don't have to.

Restart must step on the clutch, do not step on the clutch, there is damage to the engine, as long as you step on the clutch, it doesn't matter if you hang neutral or not, it is already neutral.

That's it! Generally, after parking, it is in the neutral position, and there is no need to step on the neutral gear in summer. It is good to step on the clutch and ignite the fire in winter. Don't be that hard.

What kind of car, some cars are installed with a clutch pedal switch, even if you have to step on the clutch to ignite even in neutral gear! All the future ignition or develop the habit of stepping on the clutch as well! I've seen with my own eyes a beautiful eyebrow to open the speed, the gear is hanging, the ignition did not step on the clutch, a nervous and mistaken the accelerator as a brake, a hit on our company's dog cage, two golden retrievers almost died!

Be sure to develop the habit of confirming that it is neutral, either stepping on the clutch or pulling the gear handlebar, and confirming that it is pulling the handbrake.

Make sure the car starts smoothly.

This is the primary function of the clutch. Before the car starts, it is natural to start the engine first. Whereas, when the car starts, the car accelerates gradually from a completely stationary state.

If the drivetrain (which links the entire car) is rigidly connected to the engine, the car will suddenly rush forward as soon as the transmission is engaged, but it will not start. This is because the car has a lot of inertia when it goes from stationary to forward, which causes a lot of drag torque to the engine. Under the action of this inertial drag torque, the engine speed drops sharply to below the minimum stable speed (generally 300-500rpm) in an instantaneous time, and the engine stops and cannot work, and of course, the car cannot start.

That's why we need the help of the clutch. After the engine starts, before the car starts, the driver first presses the clutch pedal, disengages the clutch, disengages the engine and the drive train, and then puts the transmission into gear, and then gradually releases the clutch pedal to make the clutch gradually engaged. In the process of engagement, the drag torque of the engine gradually increases, so the accelerator pedal should be gradually pressed at the same time, that is, the fuel supply to the engine should be gradually increased, so that the speed of the engine is always maintained at the lowest stable speed without stalling.

At the same time, as the engagement of the clutch gradually increases, the torque transmitted by the engine to the driving wheels through the drive train gradually increases, and when the traction force is sufficient to overcome the starting resistance, the car starts to move from a standstill and accelerates gradually.

Achieve smooth gear shifts.

In the process of driving, in order to adapt to the changing driving conditions, the drive train often has to change different gears to work. To realize the gear shift of the gear transmission, it is generally to toggle the gear or other gear mechanism, so that a gear pair of the original gear is pushed out of the transmission, and then the gear pair of another gear is put into the work. Before shifting gears, the clutch pedal must be stepped on, and the power transmission is interrupted, so that the meshing pair of the original gear can be disengaged, and the speed of the meshing part of the new gear meshing pair is gradually synchronized, so that the impact when entering the meshing can be greatly reduced, so as to achieve smooth gear shifting.

3. Prevent overload of the drive train.

When the car is braking urgently, if there is no clutch, the engine will be rigidly connected with the drive train and reduce the speed sharply, so all the moving parts will produce a large moment of inertia (its value may greatly exceed the maximum torque emitted by the engine when it is working normally), causing a load that exceeds its bearing capacity to the drive train, and causing damage to the parts. With a clutch, this danger can be eliminated by relying on the relative movement that may occur between the active and driven parts of the clutch. Therefore, we need a clutch to limit the maximum torque that the drivetrain can experience in order to be safe.

1. Safety: The main purpose of stepping on the clutch is to prevent the car from rushing forward when it starts, resulting in accidents. Especially if you start the ignition on an uphill or downhill road, you must step on the clutch.

In the unlikely event that the car slides because you don't step on the clutch, there may be an accident.

2. Protection: Stepping on the clutch when starting the ignition can also protect the engine. Because when not pedaling, the engine will be overloaded, which will cause damage to the engine. Although it doesn't matter once or twice, over time, problems with the engine will slowly appear.

Because you need to change gears when starting, you need to step on the clutch, change gears and then control the clutch to ensure a smooth start.

The function of the clutch is to temporarily interrupt the power transmission in order to change gears. When you start, you have to be in gear, and of course you have to step on the clutch first.

Although it can be activated without pressing the clutch, it is better for the car to press the clutch.

Benefits of starting the clutch pedal:

1. It reduces the load of the starter, thereby reducing the mechanical loss of the starter and the consumption of battery volume. Because there are two rows of gears in the manual transmission, the upper gear (two-shaft gear) is connected with the transmission shaft and the wheel, and the lower gear (intermediate shaft gear) is connected to the engine through the clutch, and when in neutral, only the lower gear is transmitted, and the power of the engine cannot be transmitted to the upper gear, and the car will not move, but the lower gear in the gearbox still rotates with the engine at this time.

If the clutch pedal is pressed, the clutch is in a disengaged state, the engine and the lower gear are separated, the load on the starter is reduced, the battery power is saved, and the mechanical loss of the starter is also reduced.

2. It is conducive to the start of the low-temperature chiller. When the engine is started in winter, the gear rotation will be subject to greater resistance due to the sticky gear oil. If you press the clutch pedal first and then start the engine, because the transmission is separated from the engine, the engine will turn faster, so it is easier to start, which reduces the number of cold starts and also reduces mechanical losses.

3 is to make sure it is safe at startup. If you start the engine without stepping on the clutch as soon as you get on the car, if the transmission is in forward or reverse gear at this time, the car will rush forward and backward, which is prone to traffic accidents, which greatly increases the mechanical wear and tear of the car, but if you press the clutch pedal first and then start the engine, this accident will not occur. Therefore, it is important to develop a good habit of pressing the clutch pedal before starting the start.

First of all, the clutch is stepped on to reduce the load capacity of the engine, and then the service life of the engine is extended. And if you don't step on the clutch to start the car directly, the engine will generate load, and the current of the storage spine battery is also large, which will cause great damage to the car. In addition, it is to step on the clutch when starting the car can also prevent safety, some drivers forget to return the gear to neutral gear when parking, at this time they will get off the car directly, if the second time to drive, do not step on the clutch that slow branch seepage car is likely to be already in the gear, so that it will rush up directly, there will definitely be potential safety hazards.

Ensure that the car starts smoothly.

Before starting, the car is in a stationary state, if the engine and the gearbox are rigidly connected, once the gear is hung, the car will suddenly rush forward due to the sudden lack of power, which will not only cause damage to the parts, but also the driving force is not enough to overcome the huge inertia generated by the forward rush of the car, so that the engine speed drops sharply and extinguishes the fire.

2. Easy to shift.

When the car is driving, it often switches to different gearboxes to adapt to changing driving conditions. If there is no clutch to temporarily separate the engine from the gearbox, the meshing force transmission gears in the gearbox will be difficult to separate because the load is not removed, and the pressure between the meshing tooth surfaces is very high.

3. Prevent the transmission system from overloading.

When the car brakes urgently, the wheels suddenly and sharply reduce speed, and the drive train connected to the engine still maintains the original speed due to the inertia of rotation, which often produces a moment of inertia in the transmission system that is much greater than the engine torque, making the parts of the drive train easy to damage.

Because the clutch relies on friction to transmit torque, when the load in the drive train exceeds the torque that can be transmitted by friction, the main and driven parts of the clutch will automatically slip, thus preventing the drive train from overloading.

4. Reduce torsional vibration impact.

The working principle of an automobile engine determines the unevenness of its output torque. In the power stroke, the combustion chamber gas** produces a great impact torque, while in other strokes, it is the inertial back-dragging engine.

Why do cars have to step on the clutch when they start? First of all, the manual transmission car needs to be mounted through the clutch, because the engine and the gearbox are connected to the power of the engine through the clutch early, and transmitted to the gearbox through the clutch.

Because different cars have different gear shift systems.

If it is an automatic transmission car, there is no clutch, so there is no need to pedal.

If it is a manual transmission car, there are two situations, if the ignition is in neutral, you do not need to step on the clutch; If the ignition is in gear, you need to press the clutch.

Regardless of whether the car is fast or slow, as long as the car is not in neutral, the clutch must be pressed when the brakes are pressed. He must have hung up in neutral ahead of time. Because the car does not need to press the clutch when reversing.

You can directly hang neutral. When the car is driving in neutral, you don't need to press the clutch when you press the brakes.

The manual transmission car does not step on the rationale and hangs the gear, and must be stepped on;

The automatic transmission car does not have a pedal and cannot be stepped on if you want to. Just press the brake pedal and back in gear.

1. Because the shift system of different cars is different.

2. If it is an automatic transmission car, because there is no stool hidden base and clutch, there is no need to step on it.

3. If it is a manual transmission car, there are two situations, if the ignition is in neutral gear, you don't need to step on the clutch; If the carrying gear is hung at the time of ignition, you need to press the clutch.

The car with automatic transmission cannot be toggled and started, and the manual transmission can, and the car with automatic transmission will burn the friction plates in the gearbox, but it can be pulled into neutral gear for traction.

If it's a manual transmission, it doesn't matter, it's just a warning from the manufacturer, most cars have it, and practice tells us it's okay.

Not stepping on the clutch gear requires vehicle speed and speed coordination. In different situations, the required speed, speed is not the same, in fact, the process of gear is the gear meshing process in the gearbox, if the speed of the two gears is very close to complete the meshing process at once, without stepping on the clutch. It is difficult for ordinary drivers to achieve accurate coordination of vehicle speed and rotational speed.

The depth of the clutch is related to the model, and the general car has a shorter trip, and the truck has a longer trip. A deep clutch helps the vehicle to start easily when it is heavier, and a shallow clutch is more suitable for vehicles that are easier to drive.

Step on the clutch and return to neutral. Then step on the clutch again. First gear, then go.

If you've ever been on an airplane, you'll see how big an airplane engine is, it's the size of half a car, and the engine compartment of a car is very small. And the vast majority of cars don't need such speeds.

When the speed is very fast, first step on the brakes, and when the speed slows down to a certain extent, you have to step on the clutch and brake, knowing that the car stops, and if you don't step on the clutch when the car stops, the car will turn off.