What is a high-voltage rail?

Question 1: What is high-voltage rail independent calibration? 1. Autonomous calibration of the high-pressure fuel rail refers to a fuel supply method that completely separates the generation of injection pressure and the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an ECU. The high-pressure oil pump pumps the high-pressure fuel It is transported to the company oil supply pipe. By accurately controlling the oil pressure in the company oil supply pipe, the pressure of the high-pressure oil pipe has nothing to do with the engine speed, which can greatly reduce the variation of the diesel engine oil supply pressure with the engine speed. changes, thereby reducing the shortcomings of traditional diesel engines. The ECU controls the amount of fuel injected by the injector. The amount of fuel injected depends on the pressure of the fuel rail (public fuel supply pipe) and the opening time of the solenoid valve.

2. The function of the high-pressure fuel rail:

The high-pressure oil pump delivers fuel to the fuel supply pipe of the company, and controls the fuel injector to inject the fuel directly into the cylinder. Inside. The high-pressure injection rail completely separates the injection process and oil pressure generation, so that the oil supply pressure is not affected by the engine speed.

3. Advantages:

1. The injection pressure in the high-pressure rail system is flexibly adjustable, and the optimal injection pressure required can be determined for different working conditions, thereby Optimize the overall performance of diesel engines.

2. The injection timing can be independently and flexibly controlled. With high injection pressure (120MPa~200MPa), NOx and particulate matter (PM) can be controlled simultaneously within a smaller value to meet emission requirements. .

3. Flexible control of changes in fuel injection rate to achieve ideal fuel injection rules, easy to achieve pre-injection and multiple injections, which can not only reduce diesel engine NOx, but also ensure excellent power and economy.

4. The fuel injection is controlled by the solenoid valve, and the control accuracy is high. There will be no bubbles and zero residual pressure in the high-pressure oil circuit. Therefore, within the operating range of the diesel engine, the cyclic fuel injection volume will change little. , the uneven oil supply of each cylinder can be improved, thereby reducing the vibration of the diesel engine and reducing emissions.

Question 2: What is a rail diesel engine? High-pressure mon Rail electronic injection technology refers to a fuel supply method that completely separates the generation of injection pressure and the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an electronic control unit (ECU). . It uses a high-pressure oil pump to deliver high-pressure fuel to the company oil supply pipe (Rail). It achieves precise control through the oil pressure in the company oil supply pipe, so that the pressure of the high-pressure oil pipe (Pressure) has nothing to do with the engine speed. It can greatly reduce the degree of change of diesel engine oil supply pressure with engine speed.

Currently, there are three major companies in the world that are developing and producing diesel engine high-pressure rail systems, Japan Denso, Germany Bosch and the United States Ford. The rail system separates fuel pressure generation and fuel injection. If the unit pump diesel injection technology is compared to a revolution in diesel technology, the rail system can be called a rebellion because it deviates from the traditional Diesel systems are similar to sequential gasoline injection systems. The rail system opens up new ways to reduce diesel engine emissions and noise.

Due to its strong technical potential, today various manufacturers have set their sights on the third generation of axle rail systems - piezoelectric (piezo) axle rail systems, piezoelectric actuators Instead of a solenoid valve, more precise injection control is achieved. Without the oil return pipe, the structure is simpler. The pressure is elastically adjustable from 200 to 2000 Pa. The minimum injection volume can be controlled at 0.5mm3, which reduces smoke and NOX emissions.

Question 3: What the hell is a "high-voltage rail"? What is a high-voltage rail?

High-pressure injection rail technology refers to a fuel supply method that completely separates the generation of injection pressure and the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an ECU. The oil pump delivers high-pressure fuel to the engine oil supply pipe. By accurately controlling the oil pressure in the engine oil supply pipe, the pressure in the high-pressure oil pipe has nothing to do with the engine speed, which can greatly reduce the diesel engine oil supply pressure. With the change of engine speed, the defects of traditional diesel engines are reduced. The ECU controls the amount of fuel injected by the injector. The amount of fuel injected depends on the pressure of the fuel rail (public fuel supply pipe) and the opening time of the solenoid valve.

What is the use of high-voltage *** rail?

The high-pressure oil pump delivers fuel to the fuel supply pipe of the company, and the fuel is directly injected into the cylinder by controlling the injector. The high-pressure injection rail completely separates the injection process and oil pressure generation, so that the oil supply pressure is not affected by the engine speed.

Advantages:

Question 4: What does the high-pressure rail of a diesel vehicle mean? EFI engines must go to an authentic petrochemical company for refueling. The consequences are very serious. The service station information is high-pressure mon rail. EFI technology refers to a closed loop composed of a high-pressure oil pump, a pressure sensor, and an electronic control unit (ECU). In the system, a fuel supply method that completely separates the generation of injection pressure and the injection process from each other. It uses a high-pressure oil pump to deliver high-pressure fuel to the company's oil supply pipe (Rail). It achieves precise control through the oil pressure in the company's oil supply pipe, so that the pressure of the high-pressure oil pipe (Pressure) has nothing to do with the engine speed. It can greatly reduce the degree of change of diesel engine oil supply pressure with engine speed. Injection rail technology refers to a closed-loop system composed of high-pressure oil pump, pressure sensor and ECU, which completely separates the generation of injection pressure and the injection process. In the oil supply method, the high-pressure oil pump delivers high-pressure fuel to the engine oil supply pipe. By accurately controlling the oil pressure in the engine oil supply pipe, the pressure in the high-pressure oil pipe has nothing to do with the engine speed, and can be greatly improved. Reduce the change of diesel engine oil supply pressure with engine speed, thus reducing the shortcomings of traditional diesel engines. The ECU controls the amount of fuel injected by the injector. The amount of fuel injected depends on the pressure of the fuel rail (public fuel supply pipe) and the opening time of the solenoid valve. Refers to a rail system for diesel engine fuel injection that separates fuel pressure generation and fuel injection. If unit pump diesel injection technology is compared to a revolution in diesel technology, then rail can be called a rebellion. , because it deviates from the traditional diesel system and approximates a sequential gasoline injection system. The rail system has opened up a new way to reduce diesel engine emissions and noise. Europe can be said to be a paradise for diesel cars, with diesel cars accounting for 39% in Germany. Diesel cars have a history of nearly 70 years, and it can be said that diesel engines have developed by leaps and bounds in the past 10 years. In 1997, Bosch and Mercedes-Benz jointly developed the mon Rail diesel injection system (mon Rail System). Today in Europe, many brands of cars are equipped with a rail diesel engine. For example, Peugeot has an HDI rail diesel engine, Fiat has a JTD engine, and Delphi has developed a Multec DCR diesel rail system. . The rail-type diesel injection system is different from the previous camshaft-driven diesel injection system. The rail-type diesel injection system completely separates the generation of injection pressure and the injection process from each other. The solenoid valve controlled injector replaces the traditional mechanical injector. The fuel pressure in the fuel rail is generated by a radial piston high-pressure pump. The pressure has nothing to do with the engine speed and can be freely set within a certain range. . The fuel pressure in the fuel rail is controlled by an electromagnetic pressure regulating valve, which continuously adjusts the pressure according to the working needs of the engine. The electronic control unit acts on the pulse signal on the solenoid valve of the injector to control the fuel injection process. The amount of fuel injected depends on the oil pressure in the fuel rail, the opening time of the solenoid valve, and the liquid flow characteristics of the injector. Fuel injection pressure is an important indicator of a diesel engine because it is related to the engine's power, fuel consumption, emissions, etc.

The first-rail diesel injection system has increased the fuel injection pressure to 1800 bar. In the past two years, cars equipped with direct injection diesel engines have developed significantly in Europe, with high efficiency and excellent fuel economy, and reduced engine noise. The direct injection diesel engine uses a pump nozzle system. The domestically produced 1.9TDI Bora uses this system, and the maximum injection pressure can reach 1800 bar. Although the pump nozzle direct injection system is good, the fuel pressure cannot be kept constant. As emission control becomes more stringent, higher and constant diesel injection pressure and more complete electronic control are required, so many manufacturers have improved the advantages. Multiple diesel rail systems are the development direction of diesel engines. This system has high fuel pressure and can provide flexible fuel distribution control, flexibly controlling fuel distribution, fuel injection time, injection pressure and injection rate through the ECU. By controlling the above characteristics, the diesel engine's responsiveness and driving comfort have reached the level of gasoline engines. At the same time, it has significant fuel economy and low emission characteristics. High fuel pressure is ensured in all engine speed ranges. High injection pressure can obtain good combustion characteristics at low speeds. For engines with axial piston distribution pumps controlled by camshaft drive, the fuel system pressure is proportional to the engine speed. The linear relationship creates insufficient fuel pressure at low engine speeds, while the rail system can obtain very high fuel pressure in all engine speed ranges. The flexible electronic control system controls timing and injection pressure in various aspects of the engine... >>

Question 5: In a car, what is rail direct injection? At present, the pump nozzle technology commonly used in domestic Bora, Audi and other diesel vehicles has been significantly improved compared to previous technologies (such as plunger pumps), and its biggest benefit is that it greatly increases the fuel injection pressure. Its enhanced version of the turbo increases The injection pressure of pressure pump nozzle technology can reach more than 2000bar. Since the injection pressure directly affects the efficiency of diesel combustion, it can be said that the combustion efficiency of the pump nozzle is already very high.

However, due to the pump nozzle technology, the pressure of the diesel in the high-pressure oil pipe fluctuates with the vehicle speed, which increases the smoke and hydrocarbon emissions, and leads to increased fuel consumption and high engine vibration and noise. The main contribution of the rail-type fuel injection system is to completely separate the generation of injection pressure and the injection process from each other. By accurately controlling the oil pressure in the rail pipe, the pressure of the high-pressure oil pipe is basically independent of the engine speed. . This innovation in diesel engine technology minimizes the vibration and noise of diesel engine models, while further reducing fuel consumption and making emissions cleaner. However, the injection pressure of rail technology is lower than that of the pump nozzle system, generally reaching about 1600bar. Due to the wide adjustment of injection pressure, diesel vehicles using single-rail technology will better adapt to various working conditions and will not have difficulty starting.

Question 6: What does automotive rail technology mean? It refers to a type of diesel engine fuel injection

The rail system separates fuel pressure generation and fuel injection. If If unit pump diesel injection technology is compared to a revolution in diesel technology, then Railroad can be called a rebellion, because it deviates from the traditional diesel system and is similar to a sequential gasoline injection system. The rail system has opened up a new way to reduce diesel engine emissions and noise

Europe can be said to be a paradise for diesel cars, with diesel cars accounting for 39% in Germany. Diesel cars have a history of nearly 70 years, and it can be said that diesel engines have developed by leaps and bounds in the past 10 years. In 1997, Bosch and Mercedes-Benz jointly developed the mon Rail diesel injection system (mon Rail System). Today in Europe, many brands of cars are equipped with a rail diesel engine. For example, Peugeot has an HDI rail diesel engine, Fiat has a JTD engine, and Delphi has developed a Multec DCR diesel rail system. .

The rail-type diesel injection system is different from the previous camshaft-driven diesel injection system. The rail-type diesel injection system completely separates the generation of injection pressure and the injection process from each other. The solenoid valve controlled injector replaces the traditional mechanical injector. The fuel pressure in the fuel rail is generated by a radial piston high-pressure pump. The pressure has nothing to do with the engine speed and can be freely set within a certain range. .

The fuel pressure in the fuel rail is controlled by an electromagnetic pressure regulating valve, and the pressure is continuously adjusted according to the working needs of the engine. The electronic control unit acts on the pulse signal on the solenoid valve of the injector to control the fuel injection process. The amount of fuel injected depends on the oil pressure in the fuel rail, the opening time of the solenoid valve, and the liquid flow characteristics of the injector.

Fuel injection pressure is an important indicator of a diesel engine because it is related to the engine's power, fuel consumption, emissions, etc. The rail diesel injection system has increased the fuel injection pressure to 1800 bar

In the past two years, cars equipped with direct injection diesel engines have developed significantly in Europe, with high efficiency and excellent fuel economy. and reduced engine noise. The direct injection diesel engine uses a pump nozzle system. The domestically produced 1.9TDI Bora uses this system, and the maximum injection pressure can reach 1800 bar. Although the pump nozzle direct injection system is good, the fuel pressure cannot be kept constant. As emission control becomes more stringent, higher and constant diesel injection pressure and more complete electronic control are required, so many manufacturers have improved the advantages. Multiple diesel rail systems are the development direction of diesel engines. This system has high fuel pressure and can provide flexible fuel distribution control, flexibly controlling fuel distribution, fuel injection time, injection pressure and injection rate through the ECU. By controlling the above characteristics, the diesel engine's responsiveness and driving comfort have reached the level of gasoline engines. At the same time, it has significant fuel economy and low emission characteristics.

Ensure high fuel pressure in all engine speed ranges, and high injection pressure can obtain good combustion characteristics at low speeds

Axial column controlled by camshaft drive For engines with a plug-type distribution pump, the fuel system pressure has a linear relationship with the engine speed, resulting in insufficient fuel pressure at low engine speeds, while the rail system can obtain very high fuel pressure in all engine speed ranges. The flexible electronic control system controls timing and injection pressure to achieve low emissions and high efficiency under various engine operating conditions. Since the pressure build-up is separated from the injection process, engine designers gain greater freedom when studying the combustion and injection processes. The injection pressure and injection timing can be adjusted according to the requirements of the engine operating conditions, so that the engine can achieve complete combustion at low speeds, so high torque can be obtained even at very low speeds. The application of pre-injection technology has made greater progress in reducing emissions and noise.

The fuel supply system is precisely controlled

The low-pressure oil pump sucks the diesel from the fuel tank, filters it and supplies it to the high-pressure oil pump. There is a solenoid valve in the low-pressure pump to control the fuel to reach the high-pressure pump chamber. The fuel enters the two-tube accumulator - the fuel rail. There is a pressure sensor on the rail that constantly monitors the fuel pressure, and transmits this signal to the ECU, which controls the fuel pressure in the rail to reach the desired value by adjusting the flow rate. The injection pressure ranges from 200 to 1800 bar depending on the engine operating conditions, and is then injected into the cylinders through computer control. The injection rail not only maintains the fuel pressure, but also eliminates pressure fluctuations.

Fuel injection is a very complex joint operation of mechanical, hydraulic and electronic systems. It must adapt to the working environment of the engine under various working conditions. In the combustion... >>

< p> Question 7: What does ***rail mean? ***rail system

***rail system means that diesel oil is sucked out from the fuel tank by the gear pump, passes through the oil-water separator, passes through the gear pump, and then reaches the diesel The fine filter, high-pressure pump, rail pipe, injector, and the closed-loop fuel supply system composed of sensors and ECU are a fuel supply method that completely separates the generation of injection pressure and the injection process.

System Overview Editor

Principle

The rail pump delivers high-pressure fuel to the company’s fuel supply pipe (rail pipe) , the ECU controls the opening of the flow electromagnetic regulating valve of the primary rail pump to accurately control the oil pressure of the primary rail pipe, so that the pressure of the high-pressure oil pipe has nothing to do with the engine speed, thus overcoming the problem that the diesel engine oil supply pressure changes with the speed of the engine. Changes in engine speed. The ECU controls the amount of fuel injected by the injector. The amount of fuel injected depends on the pressure of the fuel rail (public fuel supply pipe) and the opening time of the solenoid valve.

Diesel filter

The diesel filter consists of two stages of filters. The first stage is an oil-water separator, also called pre-filter, at the front end of the gear pump, and the latter stage is The diesel fine filter, also called the main filter, is at the rear end of the gear pump. High-end diesel fine filters are currently basically monopolized by foreign capital and joint ventures, especially those that meet the requirements of high-pressure rail engines with emission levels above National III. The supporting equipment of OEMs are almost all imported products from foreign companies or domestically produced by foreign-funded enterprises. Investing in factory production, there are also national brands entering the main engine supporting equipment, such as Duffet in Suzhou Industrial Park. The products of these enterprises are of reliable quality. The main ones are: foreign-funded enterprises: Mann.Hu (Germany), Parker (USA), *** (Germany), Friedrichshafen (USA), Donaldson (USA), Bosch (Germany), etc. ; Domestic brands include DIFITE, Pingyuan, etc.

High-pressure pump

The high-pressure pump compresses the fuel to a system pressure of up to 1450bar. The fuel then passes through the high-pressure pipe into the tubular high-pressure fuel accumulator (rail). In the high-pressure pump, the fuel is compressed by three radially arranged pistons. The angle between the pistons is 120°. Each cycle carries out three delivery strokes. Since each revolution produces three pressure strokes, only a low peak driving torque is generated, so the force on the pump drive remains uniform. The power that drives the oil pump to rise is proportional to the pressure set in the rail and the speed of the oil pump (oil delivery volume).

Rail

Used to store high-pressure diesel, reduce fluctuations, and control injection pressure.

Fuel injector

The actuator that realizes quantitative injection.

Question 8: What is a high-voltage rail? How does it work? High-pressure mon Rail electronic injection technology refers to a fuel supply method that completely separates the generation of injection pressure and the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an electronic control unit (ECU). . It uses a high-pressure oil pump to deliver high-pressure fuel to the company oil supply pipe (Rail). It achieves precise control through the oil pressure in the company oil supply pipe, so that the pressure of the high-pressure oil pipe (Pressure) has nothing to do with the engine speed. It can greatly reduce the degree of change of diesel engine oil supply pressure with engine speed.

Use high pressure to inject polyurethane sealing agent into the concrete crack structure and spread it until all gaps (including those that are difficult to detect with the naked eye) are filled. When filled with water (water injection), a large amount of carbon dioxide gas is released along with the cross-linking reaction, generating osmotic pressure, high-pressure propulsion force and secondary osmotic pressure to press the elastomer into and fill all gaps to achieve the purpose of stopping leakage.

Compared with the existing traditional technology, high-pressure grouting has made a qualitative leap in terms of construction principles and construction speed. High-pressure grouting technology will inevitably replace some traditional construction methods with its fast construction speed, scientific construction principles, and high success rate.

Question 9: What is the autonomous calibration of the high-voltage rail? 1. Autonomous calibration of the high-pressure fuel rail refers to a fuel supply method that completely separates the generation of injection pressure and the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an ECU. The high-pressure oil pump pumps the high-pressure fuel It is transported to the company oil supply pipe. By accurately controlling the oil pressure in the company oil supply pipe, the pressure of the high-pressure oil pipe has nothing to do with the engine speed, which can greatly reduce the variation of the diesel engine oil supply pressure with the engine speed. changes, thereby reducing the shortcomings of traditional diesel engines. The ECU controls the amount of fuel injected by the injector. The amount of fuel injected depends on the pressure of the fuel rail (public fuel supply pipe) and the opening time of the solenoid valve.

2. The function of the high-pressure fuel rail:

3. Advantages:

Question 10: What is a high-voltage rail? How does it work? High-pressure mon Rail electronic injection technology refers to a fuel supply method that completely separates the generation of injection pressure and the injection process in a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an electronic control unit (ECU). . It uses a high-pressure oil pump to deliver high-pressure fuel to the company oil supply pipe (Rail). It achieves precise control through the oil pressure in the company oil supply pipe, so that the pressure of the high-pressure oil pipe (Pressure) has nothing to do with the engine speed. It can greatly reduce the degree of change of diesel engine oil supply pressure with engine speed.