Trade intelligence for aerospace industry

List of contents of this article:

• 1,Trade intelligence for aerospace industry What is the reason for the unstable idling speed of the Jianghuai truck diesel engine?
• 2, What is the reason for the unstable idle speed of the diesel engine?
• 3 、What is the cause and handling method of the failure of Cummins diesel engine idling instability?

What is the reason for the unstable idling speed of the Jianghuai truck diesel engine?

The most common reasons for car shaking may be excessive throttle and too much carbon in the fuel injector.

The main reason for the idling jitter of diesel vehicles is the uneven idling oil supply of the fuel injection pump, or the blockage of the nozzle of a cylinder injector and the atomization is poor.

The most common cause of idling jitter is excessive carbon accumulation in the throttle valve or fuel injector. When there is too much carbon inside the engine, the gasoline sprayed by the fuel injector during cold start will be absorbed by a large amount of carbon, resulting in too thin mixed gas, making it difficult to start. In this case, it is easy to start the car only when the gasoline absorbed by the carbon is saturated.

The specific reason for the unstable shaking of the car engine; excessive carbon accumulation in the engine: When there is too much carbon accumulation inside the engine, the gasoline sprayed by the fuel nozzle of the starting vehicle will be absorbed by a large amount of carbon accumulation, resulting in the mixture being too thin and difficult to start. The vehicle is easy to start only when the carbon-absorbed gasoline is saturated.

The idling jitter of diesel engines is commonly caused by the following reasons: the oil nozzle of a cylinder injector is stuck and the atomization is poor, causing the cylinder to not work or does not work (the exhaust will have blue and white smoke). It can be checked by the broken cylinder method. The idling oil supply of the injection pump is uneven, resulting in uneven operation of the idling cylinders.

The reason for the idling jitter of electric injection diesel vehicles: the oil supply pressure of the gasoline system is too low, the idle control system fails; the injection hole does not inject fuel, the atomization is poor, and the fuel injection volume of each cylinder is unbalanced;The sensor signal is incorrect, resulting in the fuel injection signal controlled by the engine ECU being inconsistent with the actual working conditions; air leakage after the engine throttle; the ignition time is wrong or the ignition energy is insufficient.

What is the reason for the unstable idle speed of the diesel engine?

The engine has serious carbon accumulation.The most common cause of idling jitter is excessive carbonisation of the throttle valve or fuel nozzle.

The reasons for the unstable idle speed of the engine are: excessive carbonization rate of the engine, empty air filter, low ignition energy, abnormal water temperature, carbon accumulation of the valve and air intake, blockage of the fuel injector, etc.

The reason is that the idling oil supply of the fuel injection pump is uneven, resulting in uneven operation of each idling cylinder. Or the valve is not tightly sealed, resulting in poor work.

For diesel vehicles with mechanical injection pumps, it is normal for cold start idle speed to be unstable, especially when the ambient temperature is relatively cold, not only will the idle speed be unstable, but also blue smoke and black smoke will appear. If it is an electric injection diesel vehicle, there are many reasons for this situation.

What's wrong with the unstable idle speed of diesel electric injection?

1. Reasons for idling jitter of electric injection diesel vehicles: the oil supply pressure of the gasoline system is too low, and the idle control system fails; the injection hole does not inject fuel, the atomization is poor, and the fuel injection volume of each cylinder is unbalanced; the sensor signal is incorrect, resulting in the fuel injection signal controlled by the engine ECU is inconsistent with the actual working conditions; after the engine throttle Air leakage; wrong ignition time or insufficient ignition energy.

2. At this time, it is necessary to check the air intake system of the car. For example, the unstable idling speed of the electric injection vehicle may be due to oil stains on the intake temperature sensor, resulting in the inability of the ECU to check the intake temperature and accurately adjust the amount of fuel injection, which in turn affects the abnormal fuel injection and leads to unstable idle speed.

3. Common reasons for unstable diesel idling: 1. When idling, the cylinder leakage is large, and the energy loss in the cylinder is large, resulting in low compression temperature and pressure, poor fuel atomization, and large combustion fluctuations.2. The oil supply is relatively small when idling, and the slight change in the oil supply of each cylinder will lead to different working states of each cylinder.

Instability analysis of diesel engine idle speed

Engine carbon accumulation is serious. The most common cause of idling jitter is excessive carbonisation of the throttle valve or fuel nozzle.

The reasons for the unstable idle speed of the engine are: excessive carbonization rate of the engine, empty air filter, low ignition energy, abnormal water temperature, carbon accumulation of the valve and air intake, blockage of the fuel injector, etc.

Solution: Replace the air filter in time. If there is too much dust on the filter to block the air intake, and the air intake of the engine is seriously insufficient, the idling speed of the diesel car will be high and low, and the vehicle's power will be insufficient.

3 Improper adjustment of the idling stabilizer.4 Poor atomization of the fuel injector. 5 The fuel supply of the injection pump is uneven. 6 The pin shaft and fork of each connecting rod of the speed adjuster are too worn.

What is the reason for the unstable idling of diesel vehicles?

1. The main reason for idling jitter; the most common reason for car jitter is that the throttle valve is too dirty or the fuel injector has too much carbon.

2. Specific reasons for unstable jitter at idle speed of the car engine; excessive carbon accumulation in the engine: When there is too much carbon accumulation inside the engine, the gasoline sprayed by the fuel nozzle of the starting vehicle will be absorbed by a large amount of carbon accumulation, resulting in too thin mixture and difficult start. The vehicle is easy to start only when the carbon-absorbed gasoline is saturated.

3. Common reasons for unstable idling of diesel: 1.When idling, the air leakage of the cylinder is large, and there is a lot of energy loss in the cylinder, resulting in low compression temperature and pressure, poor fuel atomization, and large combustion fluctuations. 2. The oil supply is relatively small when idling, and the slight change in the oil supply of each cylinder will lead to different working states of each cylinder.

4. The reason is that the idling oil supply of the fuel injection pump is uneven, resulting in the uneven operation of the idling cylinders. Or the valve is not tightly sealed, resulting in poor work.

5. The engine idle speed is unstable, suddenly high and low, which is one of the common faults of the engine, manifested as engine idling jitter.

6. The reason for the whole machine of x0dx0a includes the wear between the parts in the cylinder or the gap or improper position caused by improper installation. As a result, the cylinder airtightness is poor and the temperature and pressure are unstable, and the idling mechanism cannot work well.X0dx0a In terms of oil supply, it should be checked whether the oil supply is sufficient and stable.

The cause and handling method of the failure of Cummins diesel engine idle instability?

The engine has serious carbon accumulation. The most common cause of idling jitter is excessive carbonisation of the throttle valve or fuel nozzle.

Improper adjustment of the speed control spring: When idling, due to the small centrifugal force of the flying ball, the control force of speed regulation is also small. If the diesel generator slows down suddenly, the adjustment movement of the oil supply lever may exceed the idling position, causing the diesel generator to shut down.

The reason for affecting the uneven speed of the Cummins generator set is mostly due to the abnormal resistance of the moving parts of the fuel injection pump and speed adjuster, and the slow response of the speed regulator.There are many specific factors, generally there may be the following 8 points. ( 1) Individual cylinders do not work.

The main reason for idling jitter; the most common reason for car jitter is that the throttle valve is too dirty or the fuel injector has too much carbon.

The machine is easy to turn off during emergency deceleration and load, which is mostly caused by speed regulator failure. Take the rsv speed governor as an example, the main reasons for the unstable idle operation of the engine are: (1) The wear of the flying block will be seriously worn due to poor lubrication of the speed governor or long-term use.