A fuel sequence injection control device for an electronically controlled diesel engine

Abstract

A fuel sequence injection control device, comprising: an oil injector, which is internally provided with a hydraulic oil cavity; a three-position four-way proportional valve, one for each oil injector, for controlling the hydraulic oil into or discharge of the hydraulic oil cavity of the corresponding oil injector according to the received control signal, thereby controlling the up and down movement of the oil injection plunger to achieve the control of the injection time; a window valve, comprising a sensor and a multi-way valve, the sensor is used to monitor the position of the multi-way valve in real time, the multi-way valve adjusts the opening and closing state of its internal channel according to the control signal to control the hydraulic oil into or discharge of the hydraulic plunger at the top of the oil injector; a control system, which calculates the injection time of each oil injector by receiving the signal of the diesel engine crankshaft position sensor, and sends control signals to the three-position four-way proportional valve and the window valve, while receiving the feedback signal of the window valve to adjust the accuracy of the control signal, ensure the accurate control of the injection time and the injection amount, and realize the linkage adjustment of the optimal fuel consumption and emission.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of electrically controlled diesel engine fuel sequence injection control device. Especially for different diesel engine loads, by controlling the injection time of different injectors to accurately control injection quantity, optimize performance parameters. BACKGROUND

[0002] Fuel injection timing and fuel injection quantity are crucial for the operation of diesel engine, directly affect the operating parameters of diesel engine. By accurately controlling fuel injection, it is beneficial to obtain lower fuel consumption, lower NOx emission value, while ensuring the good running performance of main machine.

[0003] In recent years, with the increasingly stringent environmental regulations, especially in order to meet the ship pollution emission III standard, diesel engine technology has experienced rapid iteration and innovation. From the initial exhaust gas direct emission, gradually developed to install advanced exhaust gas treatment system, such as selective catalytic reduction (SCR) and exhaust gas recirculation (EGR) technology; From the traditional single fuel to dual fuel, such as fuel mixed with methane, methanol, ethane, etc.; The operation mode of electric control machine has also developed to a certain height.

[0004] However, although diesel engine technology has made significant progress in many aspects, in the field of fuel injection control, especially for the injection control of multiple injectors, there are still problems to be solved. The traditional injector spool design has not been broken through in technology, resulting in the control of multiple injectors still staying at the level of unified control, that is, all injectors act synchronously when running, and cannot realize more precise individual control. This control method limits the optimization of combustion performance, so that the optimal balance between fuel consumption and NOx emission cannot be achieved. Especially under different diesel engine load conditions, in order to meet the different fuel consumption requirements, each injector still follows the unified control strategy, and cannot be flexibly adjusted according to the actual demand, which seriously restricts the high-precision control of fuel injection.

[0005] Therefore, it is urgent to develop a new type of fuel injection control system, which can realize independent and accurate control of multiple injectors to adapt to the operation requirements under different diesel engine load conditions, so as to further optimize the combustion performance, reduce fuel consumption and NOx emission, and promote the development of diesel engine technology to a higher level. SUMMARY

[0006] For the existing fuel injection control device, the present application provides a new type of fuel sequence injection control device. It can accurately and individually control the injection time and injection quantity of each injector. Through the operating parameters fed back by the sensor, accurate regulation and control are achieved to meet the linkage adjustment of optimal fuel consumption and emission.

[0007] The content of the device of the present application is as follows:

[0008] A fuel injection sequence control device, characterized in that it comprises:

[0009] An oil injector, which is internally provided with a hydraulic oil chamber, the movement of the oil injector plunger is controlled by controlling the pressure of the hydraulic oil in the hydraulic oil chamber, thereby controlling the oil injection state of the oil injector;

[0010] A three-position four-way proportional valve, one for each oil injector, is used to control the hydraulic oil into or out of the hydraulic oil chamber of the corresponding oil injector according to the received control signal, thereby controlling the up and down movement of the oil injector plunger to realize the control of the oil injection time;

[0011] A window valve, which comprises a sensor and a multi-way valve, the sensor is used to monitor the position of the multi-way valve in real time, the multi-way valve adjusts the opening and closing state of its internal channel according to the control signal, controls the hydraulic oil into or out of the hydraulic plunger at the top of the oil injector, and one window valve controls the hydraulic oil at the top of multiple oil injectors;

[0012] A control system, which calculates the oil injection time of each oil injector by receiving the signal of the diesel engine crankshaft position sensor, and sends control signals to the three-position four-way proportional valve and the window valve, while receiving feedback signals from the window valve to adjust the accuracy of the control signal, ensure the accurate control of the oil injection time and the oil injection amount, and realize the linkage adjustment of optimal fuel consumption and emission.

[0013] Further, when the hydraulic oil chamber of the oil injector is full of hydraulic oil, the oil injector plunger cannot go up due to hydraulic resistance, the nozzle is closed and no oil injection is performed; when the hydraulic oil in the hydraulic oil chamber is discharged, the oil injector plunger loses resistance and moves upward, the nozzle opens and starts to inject oil.

[0014] Further, the three-position four-way proportional valve is controlled by the diesel engine control system, when receiving the opening signal, the hydraulic oil passage at the bottom of the valve is opened, the hydraulic oil enters the hydraulic oil chamber of the oil injector, and the oil injector plunger is kept in the lower position, and the nozzle does not inject oil; when receiving the closing signal, the hydraulic oil passage is closed, the hydraulic oil in the hydraulic oil chamber flows out through the discharge passage of the valve body, and the oil injector plunger loses hydraulic resistance and moves upward to inject oil.

[0015] Further, the sensor of the window valve feeds back the actual position of the multi-way valve to the control system, and the control system automatically adjusts the control signal according to the difference between the feedback signal and the control signal to realize the accurate control of the hydraulic plunger action.

[0016] Further, the control system realizes the linkage adjustment of diesel engine fuel consumption and emission by continuously optimizing the control algorithm, so as to achieve the best performance.

[0017] Further, the control system sends instructions to the window valve according to the angle signal provided by the crankshaft position sensor, the window valve controls the hydraulic oil into the upper part of the hydraulic plunger of the fuel injector, pushes the hydraulic plunger downward, and the fuel in the fuel injector is guided to the nozzle; at the same time, the control system sends instructions to each three-position four-way proportional valve according to the main engine operating parameters, controls the hydraulic oil into or out of the hydraulic oil cavity in the corresponding fuel injector, realizes the independent control of each fuel injector, and sequentially controls the fuel injection time and the fuel injection time length of each fuel injector.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows:

[0019] 1) By independently providing a three-position four-way proportional valve for each fuel injector, the fuel injection time and the fuel injection amount of each fuel injector can be accurately controlled. The control system can realize the linkage adjustment of the fuel consumption and the emission of the diesel engine by continuously optimizing the control algorithm. By accurately controlling the fuel injection time and the fuel injection amount of the fuel injector, the operation of the diesel engine can be more stable, and the vibration and noise caused by uneven fuel injection can be reduced.

[0020] 2) The present application can be easily integrated into the existing diesel engine control system without the need for large-scale modification of the original system. This reduces the modification cost and risk of the user BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the fuel sequential injection control device of the present application

[0022] Figure 2 is a structural diagram of the fuel injector in the present application

[0023] Figure 3 is an independent control effect diagram of the fuel injector in the present application DETAILED DESCRIPTION

[0024] The present application will be further described below in conjunction with the drawings and examples, and the present application can have other embodiments. Any technical solution formed by equivalent substitution or equivalent transformation falls within the protection scope of the present application.

[0025] The present embodiment provides a fuel sequential injection control device, which realizes the linkage adjustment of optimal fuel consumption and emission by separately controlling the fuel injection time and the fuel injection amount of each fuel injector. Specifically, it includes a fuel injector, a three-position four-way proportional valve, a window valve and a control system, which will be described in detail below.

[0026] The oil injector 1 is internally provided with a plurality of hydraulic oil chambers for controlling the upward movement of the oil injection plunger, thereby controlling whether the oil injector can perform oil injection. When the hydraulic oil chambers are filled with hydraulic oil, the oil injection plunger cannot move upward due to hydraulic resistance, the nozzle is closed, and oil injection is not performed. When the hydraulic oil in the hydraulic oil chambers is discharged, the oil injection plunger loses resistance and moves upward, the nozzle is opened, and oil injection begins, ensuring more accurate control of the oil injection time. The three-position four-way proportional valve 2 is controlled by the diesel engine control system 4. The diesel engine control system calculates the time when the oil injector needs to inject oil according to the signal fed back by the crankshaft position sensor of the diesel engine, and sends a control signal to the three-position four-way proportional valve 2. When the three-position four-way proportional valve 2 receives an opening signal, the hydraulic oil passage at the bottom of the valve is opened, and the hydraulic oil enters the hydraulic oil chamber of the oil injector through the valve body, so that the oil injection plunger is kept in a lower position and the nozzle does not inject oil. When the three-position four-way proportional valve receives a closing signal, the hydraulic oil passage is closed, the hydraulic oil in the hydraulic oil chamber flows out through the discharge passage of the valve body, and the oil injection plunger loses hydraulic resistance and moves upward to inject oil. Each oil injector is equipped with an independent three-position four-way proportional valve to achieve accurate control of the oil injection time.

[0027] The window valve 3 includes a sensor 3-1 and a multi-way valve 3-2. The sensor 3-1 is used to monitor the position of the multi-way valve 3-2 in real time to ensure the accuracy of the control signal. The multi-way valve 3-2 adjusts the opening and closing state of its internal passage according to the control signal of the control system 4, thereby controlling the inflow or discharge of hydraulic oil to the hydraulic plunger at the top of the oil injector. When the multi-way valve is in a certain position, the hydraulic plunger moves downward, and fuel enters the nozzle for injection. The sensor feeds back the actual position of the multi-way valve to the control system, and the control system automatically adjusts the control signal according to the difference between the feedback signal and the control signal to achieve accurate control of the hydraulic plunger action. One window valve 3 controls the hydraulic oil at the top of three oil injectors.

[0028] The control system 4 is the main control unit of the diesel engine, which is responsible for receiving the signal of the crankshaft position sensor, calculating the oil injection time of each oil injector, and sending control signals to the three-position four-way proportional valve and the window valve. At the same time, the control system also receives the feedback signal of the window valve sensor to adjust the accuracy of the control signal and ensure accurate control of the oil injection time and oil injection amount. Through continuous optimization of the control algorithm, the control system can realize the linkage adjustment of the diesel engine fuel consumption and emissions to achieve the best performance.

[0029] The working process of the embodiment is as follows:

[0030] When the diesel engine is running, the control system 4 sends instructions to the window valve 3 according to the angle signal provided by the crankshaft position sensor feedback of the diesel engine itself, and the window valve 3 acts after receiving the instructions to control the hydraulic oil into the upper part of the hydraulic ram of the injector 1, and the hydraulic ram goes down to guide the fuel in the injector to the nozzle to wait for injection. The multiple injectors of all cylinders are uniformly controlled by the window valve 3 to ensure that the actions of the hydraulic rams in the injectors are consistent. At this time, according to the main engine operating parameters, the ECS sends instructions to the three-position four-way proportional valve 2, and each three-position four-way proportional valve 2 controls the hydraulic oil into or discharge of the hydraulic oil cavity in the corresponding injector 1 after receiving the instructions. Only when the three-position four-way proportional valve 2 is closed, the hydraulic oil in the hydraulic oil cavity is discharged, and the corresponding injector 1 can inject. Each injector has an independent corresponding three-position four-way proportional valve 2, and each three-position four-way proportional valve 2 independently receives instructions, so that the independent control of each injector can be realized, and the injection time and injection time length of each injector can be sequentially controlled.

[0031] The fuel sequence injection control device has advantages in improving the accuracy of fuel injection control, optimizing fuel consumption and emission performance, improving the overall performance of the diesel engine, and being easy to expand and maintain, etc. Not only does the device have stronger competitiveness in the current market, but also lays a solid foundation for its future application and development.

Claims

1. A fuel sequential injection control device, characterized in that, include: The injector (1) has a hydraulic oil chamber inside. The movement of the injection plunger is controlled by controlling the pressure of the hydraulic oil in the hydraulic oil chamber, thereby controlling the injection state of the injector. Three-position four-way proportional valve (2), one for each injector (1), is used to control the hydraulic oil inlet or outlet of the hydraulic oil chamber of the corresponding injector (1) according to the received control signal, thereby controlling the up and down movement of the injection plunger and realizing the control of the injection timing. The window valve (3) includes a sensor (3-1) and a multi-way valve (3-2). The sensor (3-1) is used to monitor the position of the multi-way valve (3-2) in real time. The multi-way valve (3-2) adjusts the opening and closing state of its internal channel according to the control signal to control the hydraulic oil inlet or outlet of the hydraulic plunger at the top of the injector. One window valve (3) controls the hydraulic oil at the top of multiple injectors (1) at the same time. The control system (4) receives the signal from the diesel engine crankshaft position sensor, calculates the injection timing of each injector (1), and sends control signals to the three-position four-way proportional valve (2) and the window valve (3). At the same time, it receives the feedback signal from the window valve (3) to adjust the accuracy of the control signal, ensures the precise control of the injection timing and injection quantity, and realizes the linkage adjustment of optimal fuel consumption and emissions. The control system (4) sends a command to the window valve (3) based on the angle signal provided by the crankshaft position sensor. The window valve (3) controls the hydraulic oil to enter the upper part of the hydraulic plunger of the injector (1) and pushes the hydraulic plunger downward so that the fuel inside the injector is guided to the nozzle. At the same time, the control system (4) sends a command to each three-position four-way proportional valve (2) according to the main engine operating parameters to control whether the hydraulic oil in the hydraulic oil chamber of the corresponding injector (1) is inlet or outlet, so as to realize the independent control of each injector and sequentially control the injection time and injection duration of each injector.

2. The fuel injection sequence control device according to claim 1, characterized in that, When the hydraulic oil chamber of the injector (1) is filled with hydraulic oil, the injection plunger is unable to move upward due to hydraulic resistance, the nozzle closes, and no oil is injected; when the hydraulic oil in the hydraulic oil chamber is released, the injection plunger loses resistance, moves upward, the nozzle opens, and oil injection begins.

3. The fuel injection sequence control device according to claim 1, characterized in that, The three-position four-way proportional valve (2) is controlled by the diesel engine control system (4). When it receives the opening signal, the hydraulic oil passage at its bottom opens, and the hydraulic oil enters the hydraulic oil chamber of the injector, keeping the injection plunger in the lower position and the nozzle does not inject oil. When it receives the closing signal, the hydraulic oil passage closes, and the hydraulic oil in the hydraulic oil chamber flows out through the venting passage of the valve body. The injection plunger loses hydraulic resistance and moves upward to inject oil.

4. The fuel injection sequence control device according to claim 1, characterized in that, The sensor (3-1) of the window valve (3) feeds back the actual position of the multi-way valve (3-2) to the control system (4). The control system (4) automatically adjusts the control signal according to the difference between the feedback signal and the control signal to achieve precise control of the hydraulic piston action.

5. The fuel injection sequence control device according to claim 1, characterized in that, The control system (4) continuously optimizes the control algorithm to achieve coordinated adjustment of diesel engine fuel consumption and emissions in order to achieve optimal performance.

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