Why is it that sometimes when overtaking, you can t go up when you press the accelerator hard?

1) Oil circuit blockage First check whether the steam filter is blocked, whether the pump pressure of the gasoline pump is sufficient, and whether the fuel injector is blocked.

2) The exhaust system is blocked, check whether there is any blockage in the three-way catalytic converter and the entire exhaust pipe.

3) It may be that the throttle has too much carbon deposit, the idle position sensor, and the air flow meter are damaged.

In this case, the following aspects can be considered.

The engine torque is not enough.

For example, 5th gear, the speed of the car is 80, and the engine speed is 2000rpm, and the torque output of the engine is required to maintain this speed. At this time, the accelerator pedal is pressed to the end, and the engine can only output torque, and the speed of the car cannot go up. If the original 5th gear can run at 3000rpm and can run to 120 speeds, now it is a fault, one of the reasons is the decline in engine output, such as lack of cylinders.

Failure of the drivetrain mechanical efficiency decreases.

The engine power did not drop, the engine actually output when the throttle was pressed to the bottom, but let the drivetrain eat up, and the torque transmitted to the wheels was only equivalent to the engine's.

There is slippage in the drivetrain.

You should note that in the above example, it is said that 5 gears, speed 80, engine speed 2000, speed 120, engine speed 3000, the proportion relationship between engine speed and vehicle speed is the same. If this relationship changes, and the engine speed becomes 3000 at 80 in 5th gear, it is obvious that there is slippage inside the drivetrain. Generally speaking, as in this case, the engine speed rises quickly when you step on the accelerator, and the speed of the car rises slowly, or even does not rise.

The engine "choked".

There is also a situation where the engine displacement is relatively small, and as the age of the car increases, the power will decrease to a certain extent. When the speed of the 5th gear is 80, the speed increases and the resistance also increases, if the increase in resistance is greater than the increase in the output power of the engine, the engine is "choked" here. At this time, if you want to increase the speed of the car, you can only downshift and accelerate.

In reality, most people think that if you want the car to run fast, you have to hang a high gear, because to overtake is to make the car run fast, so you have to hang a high gear to overtake, but when you step on the accelerator deeply, you find that the speed cannot be raised at all, why is this?

Quite simply, on the one hand, there is a so-called slippage inside the drivetrain. Generally like this situation, the engine speed rises fast when you step on the accelerator, and the speed of the car rises slowly, or even does not rise.

Of course, the above refers to only one of the reasons, there is another reason that is the problem of torque, when you slam on the accelerator and want to accelerate, at this time it will automatically downshift and increase the torque, simply put, the manual transmission is also to downshift refueling overtaking to speed up fast.

For example, in fifth gear, the speed of the car is 80kmh and the engine speed is 2000, so it is necessary to output torque to start at this speed. If you press the throttle all the way down, it looks like you're accelerating quickly, but your engine can only output torque, and it's impossible for the car to go up.

This is completely a matter of shift logic, you step on the accelerator deeply, the ECU thinks you want to overtake, the shift logic is to downshift and pull the speed, it should be that the speed is super high speed can not go up. The solution is to step on a deep foot at a speed of 30, and then step on it to speed up faster.

Overtaking is like stepping on a bicycle, if you drop a gear when overtaking, it is equivalent to driving a larger gear to rotate, and the transmission ratio becomes smaller, so the engine only needs a small force to drive the gearbox to rotate. Because the required engine power is small, the engine speed will rise very quickly, the engine speed will go up, the speed will also go up, and now the torque will become larger, and the overtaking will be very fast.

In short, the lower the gear, then the greater the torque, the greater the driving force, if you want to overtake when you step on the accelerator deeply after the speed can be instantly raised, then there is no need to downshift, if not, then must downshift.

Why can't I go up when I press the accelerator when I overtake? The old driver told the truth and did it all wrong.

Caused by the mismatch between gear and speed, the correct way is to downshift and then step on the accelerator, so that the speed will naturally go up.

It is because the power of the vehicle is weak, the displacement of the engine is insufficient, and stepping on the accelerator will only make the engine rev higher, but the vehicle accelerates very slowly.

Because most of today's cars are turbocharged, if you press the accelerator throttle, its speed cannot be reached, so the speed cannot be increased.

Reasons and solutions for not being able to increase the speed of the car when pressing the accelerator:

1. If the throttle position sensor is too dirty or the voltage imbalance will lead to the failure of the electronic throttle, there will be a situation where the throttle cannot be stepped on to the bottom speed.

When stepping on the accelerator, the cable will drive the throttle, that is, the throttle, there is a position sensor on the throttle, and the control unit knows the opening of the throttle according to the throttle position sensor signal, and then calculates the corresponding signal voltage, and finally calculates the fuel injection amount of the vehicle according to this signal voltage. In the above situation, you need to check the gasoline pressure, cleanliness, and replace the gasoline filter.

In the three systems of engine intake, oil circuit and ignition, the throttle position sensor signal, it is a member of the intake system, and the engine needs sufficient air to work normally, in this case, it is necessary to check the ignition system, cylinder line, spark plug, etc.; Check the cylinder pressure, whether the engine is missing cylinders to work; Check whether the intake and exhaust lines are unobstructed (three-way catalytic blockage).

3. The oil circuit system of the engine is very important, if poor quality gasoline is added, it is very likely to cause the gasoline pump to burn out, three-way catalytic failure, piston failure, etc., which directly affects the engine power, and is easy to cause the engine to stall and accelerate without raising the speed. In this case, it is necessary to check whether there is a gasoline quality problem and replace the gasoline with better quality in time.

Notes:

There are two kinds of automobile throttle, one is the mechanical throttle and the other is the electronic throttle, which is used by the driver to adjust the cylinder intake volume according to the driving conditions and change the engine speed and power.

For new drivers on the road, when there is no need to accelerate during driving, the sole of the foot should be placed on the brake pedal in time to avoid danger in case of emergency. When the car accelerates, do not press the accelerator all the way, for automatic transmissions, pressing the throttle all the way down may cause the transmission to automatically downshift.

The subject asked: Sometimes, when overtaking, why do you press the accelerator hard and the speed can't go up? The main reason is caused by the low speed and high grade, especially the automatic transmission car with a small displacement, the speed gear does not match, when stepping on the accelerator, due to the throttle turn plate suddenly opened, the computer receives a signal to increase the amount of fuel injection, increase the air intake, but because the gearbox is currently in the high gear, so the gearbox with the head of the computer will make a forced downshift response, so the stupid number to say that the speed is always slow half a beat, this situation in the large displacement car feels better!

This is also the reason why many cars will feel like the car smacks when they step on the accelerator when overtaking, because it is because the gearbox is forced to downshift, and the rev is very high, so it will feel this way!

When overtaking, it will be better to step on the accelerator a little more, and the harder you pedal, the slower the car will speed up! Of course, if you overtake, it is best to use overtaking mode or sport mode, so that the engine computer and transmission computer will be prepared in advance, and the driving will be smoother!

The engine quickly reaches a relatively high speed and outputs maximum torque (see figure below). However, some gearboxes are slow to respond, downshifts are not aggressive, and there is not enough torque in the low-rev range, resulting in slow acceleration.

Very simple, on the one hand, the so-called drive system inside the driving people must pay attention to safety, is the biggest hidden danger, enough to achieve the integration of people and vehicles, which plays a pivotal role in the process of safe driving, so you must be proficient in driving your own car. There is slippage. Generally like this situation, when you step on the accelerator, the engine speed rises quickly, and the speed of the car rises slowly, or even does not rise.

This is the throat of the engine, and the amount of air intake depends entirely on the opening of the throttle flap. The amount of fuel injection is based on the standard of air intake, we refuel is not to step on the accelerator pedal, now the car is using electronic throttle, the depth of stepping on the accelerator pedal has a sensor transmitted to the throttle, stepping on the accelerator does not directly control the amount of fuel injection, but only controls the opening of the throttle, so as to control the amount of air intake according to: 1 air-fuel ratio to calculate the amount of fuel injection and then injection.

If you overtake in normal driving in the high-end position, if you do not downshift and only step on the accelerator, the engine speed is not in the maximum power range, and the engine position drives the vehicle to more resistance when the high-end is high-end, and the engine is holding back and slowly speeding up at this time, so the speed is very slow. Lift the clutch, supplemented by empty oil to increase the speed, then press the clutch, dial into the lower gear, lift the clutch, accelerate with a large throttle to quickly overtake and then return to the normal lane at a constant speed.

The problem you mentioned is complicated in the actual driving process, and most of the veteran drivers have encountered it. Let's analyze the reasons first: most of them are improper operation, the general situation is improper application of gears, and then the judgment of the speed of being overtaken and the condition of the road are wrong.

But later, once he drove someone else's car, his car would not be refueled, and it is estimated that this is different from car to car, different cars, there are different sensitivities, so a good car will start fast and fiercely.

When you want to overtake, you can't go up by pressing the accelerator because the gear is wrong, and when you want to speed up, you have to change the corresponding gear, otherwise you can't speed up.

This is because in the process of overtaking, it is a sudden acceleration, and in this case, the car will not be able to react in a short time.

That's because we hung up the wrong gear, although we stepped on the accelerator hard, but the oil couldn't go up, resulting in no power.

This could be because your engine circuit is broken, so you can't keep up even after pressing the throttle, or it could be because your gas pedal is also damaged, so you can go to the repair shop to take a look.

It may be that the other party's vehicle is higher than your car's configuration, or it may be that the car does not react and cannot reach the speed, so it will not be able to get up.

The worse the acceleration. Why? Here, you should figure out a word called torque distance.

What does this mean? In what case, the higher the torque, the faster the engine revs, and the lower the gear, the greater the torque. At this time, the acceleration force is the greatest and the speed is the fastest.

Why can't you speed up when you accelerate? For example, 5th gear, 80-speed and 2000rpm engine speed require the engine to output torque to maintain this speed.

When the throttle is pressed to the end, the engine can only output torque, and the speed cannot rise. If the 5th gear from the original Zhenyan can run to 120 speeds at 3000rpm, now there is a fault, one of the reasons is the decrease in engine output, such as the lack of cylinders. Just ignore the problem, the torque is too small.

Manual transmission cars can be manually downshifted to accelerate, manually integrated cars can also be downshifted and accelerated, and CVT transmission cars can be hung in the gearbox S gears to enhance engine torque and output maximum power, so as to achieve the purpose of rapid overtaking.

Drivers must pay attention to safety, which is the biggest hidden danger, enough to achieve the integration of people and vehicles, which plays a key role in the process of safe driving, so they must be proficient in driving their own cars. The controls and functions of the car must be well understood in order to complete every drive, every stretch of road, and some special sections. Now there are a lot of car gearboxes, manual gearboxes, dual clutch gearboxes, Li Mao 6VT gearboxes, 8AT gearboxes, 9AT gearboxes, CVT gearboxes, each gearbox has its own characteristics.

There was no decrease in engine power. When the throttle is pressed to the bottom, the engine actually outputs, but let the drivetrain eat up, and the torque transferred to the wheels is only equivalent to the engine. You should note that the above example is 5th gear, 80 engine speed 2000, 120 engine speed 3000, and the ratio of engine speed to speed is the same.

If this relationship changes, the engine speed changes to 3000 at 5th gear speed 80, which is a noticeable slippage inside the drivetrain. Generally speaking, in this case, the speed of the engine rises fast when you step on the throttle, and the speed rises slowly, or even does not rise which brigade is buried.

The main reason is that the low speed is caused by the high grade, especially the number of automatic transmission cars with a small displacement, the speed gear bend is not matched, we must pay attention to safety and shift in advance.

This situation is generally due to the sudden increase in engine speed, which causes the clutch plate to slip, so the car power becomes weaker.

Mainly because doing so will cause too much fuel injection, and the gasoline in the cylinder will not burn completely and the power will deteriorate.

The reason why the throttle suddenly fails to lift the speed when the car is moving:

1. After the lack of cylinders in the Jian Yu noisy engine, the car will have increased fuel consumption, black smoke, weak acceleration and disassembly, and serious shaking.

2. The main reason for clutch slippage is the lack of friction of the clutch friction plate; If the clutch is not in place, grab the gear or take it out of gear; long-term semi-clutch state sports car, stepping on the clutch and sliding; When the gear or disgear is not in place, the car will slam the throttle when the gear or disgear is not fully in place, resulting in abnormal loss of the clutch.

3. The low pressure of the oil rail usually causes similar acceleration weakness and the speed cannot go up. We can tell by measuring the rail pressure.

4. When stepping on the accelerator, the cable will drive the throttle door, that is, the throttle, there is a position sensor on the throttle, and the control unit knows the opening of the throttle according to the throttle position sensor signal, and then calculates the corresponding signal voltage, and finally calculates the fuel injection of the vehicle according to the single pressure of this signal. Therefore, if the throttle position sensor is too dirty or the voltage is out of balance, it will lead to the failure of the electronic throttle, and the throttle will not be able to go up at the end speed.