Fuel oil sequence injection control device for electronic control diesel engine

Abstract

A fuel oil sequential injection control device comprises an oil injector, a hydraulic oil cylinder and a control system, each oil injector is provided with one three-position four-way proportional valve, and the three-position four-way proportional valve is used for controlling the hydraulic oil in or out of the hydraulic oil cavity of the corresponding oil injector according to the received control signal, so that the up-and-down movement of the oil injection plunger is controlled, and the oil injection moment is controlled; the window valve comprises a sensor and a multi-way valve, the sensor is used for monitoring the position of the multi-way valve in real time, and the multi-way valve adjusts the opening and closing state of an internal channel of the multi-way valve according to the control signal and controls hydraulic oil feeding or discharging of a hydraulic plunger on the top of the oil sprayer; and the control system is used for calculating the oil injection time of each oil injector by receiving a signal of the crankshaft position sensor of the diesel engine, sending a control signal to the three-position four-way proportional valve and the window valve and receiving a feedback signal of the window valve at the same time, and is used for adjusting the precision of the control signal and ensuring the accurate control of the oil injection time and the oil injection quantity. And linkage adjustment of optimal oil consumption and emission is realized.

Description

Technical Field

[0001] The present invention relates to an electronically controlled diesel engine fuel sequence injection control device, and in particular to accurately control the fuel injection amount and optimize the performance parameters by controlling different injection times of the fuel injector for different diesel engine loads. Background Art

[0002] Fuel injection timing and fuel injection amount are crucial to the operation of diesel engines and directly affect the operating parameters of diesel engines. Precise control of fuel injection is conducive to achieving lower fuel consumption and lower NOx emissions, while ensuring good operating performance of the main engine.

[0003] In recent years, with the increasingly stringent environmental regulations, especially in order to meet the III standard for ship pollution emissions, diesel engine technology has undergone rapid iteration and innovation. From the initial direct exhaust emission, it has gradually developed to the installation of advanced exhaust treatment systems, 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 the electronic control machine has also developed to a certain level.

[0004] However, despite the significant progress made in many aspects of diesel engine technology, there are still urgent problems to be solved in the field of fuel injection control, especially in the injection control of multiple injectors. The traditional injector slide valve design has not made any technical breakthroughs, resulting in the control of multiple injectors still remaining at the level of unified control, that is, all injectors act synchronously during operation, and more precise individual control cannot be achieved. This control method limits the optimization of combustion performance, resulting in the failure to achieve the optimal balance between fuel consumption and NOx emissions. Especially under different diesel engine load conditions, in order to meet different fuel consumption requirements, each injector still follows a unified control strategy, opening and closing at the same time, and cannot be flexibly adjusted according to actual needs, which seriously restricts the high-precision control of fuel injection.

[0005] Therefore, there is an urgent need to develop a new type of fuel injection control system that can achieve independent and precise control of multiple injectors to meet the operating requirements of different diesel engine load conditions, thereby further optimizing combustion performance, reducing fuel consumption, reducing NOx emissions, and promoting diesel engine technology to a higher level. Summary of the invention

[0006] In view of the existing fuel injection control device, the present invention provides a new type of fuel sequence injection control device. It can accurately and individually control the injection time and injection amount of each injector. Through the operating parameters fed back by the sensor, accurate regulation is achieved to meet the linkage adjustment of optimal fuel consumption and emissions.

[0007] The contents of the device of the present invention are as follows:

[0008] A fuel sequence injection control device is characterized in that it includes:

[0009] The fuel injector has a hydraulic oil chamber inside, and the movement of the fuel injection plunger is controlled by controlling the pressure of the hydraulic oil in the hydraulic oil chamber, thereby controlling the fuel injection state of the fuel injector;

[0010] Three-position four-way proportional valve, one for each injector, used to control the hydraulic oil inlet or outlet of the hydraulic oil chamber of the corresponding injector according to the received control signal, thereby controlling the up and down movement of the injection plunger to achieve control of the injection timing;

[0011] The window valve includes 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 inlet or discharge of the hydraulic plunger at the top of the injector. One window valve controls the hydraulic oil at the top of multiple injectors at the same time.

[0012] The control system receives the signal from the diesel engine crankshaft position sensor, calculates the injection timing of each injector, and sends control signals to the three-position four-way proportional valve and window valve. At the same time, it receives the feedback signal from the window valve to adjust the accuracy of the control signal, ensure accurate control of the injection timing and injection amount, and achieve coordinated adjustment of optimal fuel consumption and emissions.

[0013] Furthermore, when the hydraulic oil chamber of the injector is filled with hydraulic oil, the injection plunger cannot move upward due to hydraulic resistance, the nozzle is closed, 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 is opened, and oil injection begins.

[0014] Furthermore, the three-position four-way proportional valve is controlled by the diesel engine control system. When an opening signal is received, the hydraulic oil channel at the bottom is opened, and the hydraulic oil enters the hydraulic oil chamber of the injector, so that the injection plunger remains in the lower position and the nozzle does not spray oil; when a closing signal is received, the hydraulic oil channel is closed, and the hydraulic oil in the hydraulic oil chamber flows out through the discharge channel of the valve body, and the injection plunger loses hydraulic resistance and sprays oil upward.

[0015] Furthermore, 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 achieve precise control of the hydraulic plunger action.

[0016] Furthermore, the control system realizes linkage adjustment of diesel engine fuel consumption and emission by continuously optimizing control algorithms to achieve optimal performance.

[0017] Furthermore, the control system sends instructions to the window valve according to the angle signal provided by the crankshaft position sensor, and the window valve controls the hydraulic oil to enter the upper part of the hydraulic plunger of the injector, pushing the hydraulic plunger downward, so that the fuel inside the injector is guided to the nozzle; at the same time, the control system sends instructions to each three-position four-way proportional valve separately according to the main engine operating parameters, controlling the hydraulic oil inlet or outlet of the hydraulic oil chamber in the corresponding injector, thereby realizing independent control of each injector and sequentially controlling the injection timing and injection duration of each injector.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) By equipping each injector with a three-position four-way proportional valve, the injection time and injection amount of each injector can be accurately controlled. The control system can achieve linkage adjustment of diesel engine fuel consumption and emissions by continuously optimizing the control algorithm. By accurately controlling the injection time and injection amount of the injector, the diesel engine can run more smoothly and reduce vibration and noise caused by uneven fuel injection.

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

[0021] Figure 1 Schematic diagram of the fuel injection sequence control device of the present invention

[0022] Figure 2 It is the structural diagram of the fuel injector in the present invention

[0023] Figure 3 This is the effect diagram of the independent control of the injector in the present invention DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the patent requirements of the present invention.

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

[0026] The injector 1 is usually provided with a hydraulic oil chamber inside, which is used to control the upward movement of the injection plunger, and then control whether the injector can spray oil. When the hydraulic oil chamber is full of hydraulic oil, the injection plunger cannot move upward due to hydraulic resistance, the nozzle is closed, and no oil is sprayed; when the hydraulic oil in the hydraulic oil chamber is discharged, the injection plunger loses resistance and moves upward, and the nozzle opens and starts to spray oil, ensuring that the control of the injection time is more accurate. 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 injector needs to spray oil through the signal fed back by the crankshaft position sensor of the diesel engine, and sends the 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 channel at its bottom is opened, and the hydraulic oil enters the hydraulic oil chamber of the injector through the valve body, so that the injection plunger remains in the lower position and the nozzle does not spray oil; when the three-position four-way proportional valve receives a closing signal, the hydraulic oil channel is closed, the hydraulic oil in the hydraulic oil chamber flows out through the discharge channel of the valve body, the injection plunger loses hydraulic resistance, and sprays oil upward. Each injector is equipped with an independent three-position four-way proportional valve to achieve precise control of the injection timing.

[0027] The window valve 3 includes two parts: a sensor 3-1 and a multi-way valve 3-2. Among them, 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 channel according to the control signal of the control system 4, thereby controlling the hydraulic oil inlet or discharge of the hydraulic plunger at the top of the injector. When the multi-way valve is in a certain position, the hydraulic plunger moves downward, and the fuel is able to enter 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 precise control of the hydraulic plunger action. One window valve 3 controls the hydraulic oil at the top of three injectors at the same time.

[0028] Control system 4 is the main control unit of the diesel engine, which is responsible for receiving the signal from the crankshaft position sensor, calculating the injection time of each 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 from the window valve sensor to adjust the accuracy of the control signal to ensure accurate control of the injection time and injection amount. By continuously optimizing the control algorithm, the control system can achieve linkage adjustment of diesel engine fuel consumption and emissions to achieve optimal performance.

[0029] The workflow of this 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 fed back by the diesel engine itself. After receiving the instructions, the window valve 3 acts to control the hydraulic oil to enter the upper part of the hydraulic plunger of the injector 1, push the hydraulic plunger downward, and guide the fuel inside 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 action of the hydraulic plunger in the injector is consistent. At this time, according to the operating parameters of the host, the ECS will send instructions to the 2 three-position four-way proportional valves separately. After receiving the instructions, each three-position four-way proportional valve 2 controls the hydraulic oil in the hydraulic oil chamber of the corresponding injector 1 to enter or drain. Only when the three-position four-way proportional valve 2 is closed, the hydraulic oil in the hydraulic oil chamber is drained, and the corresponding injector 1 can spray oil. Each injector has an independent corresponding three-position four-way proportional valve 2, and each three-position four-way proportional valve 2 receives instructions independently, so that each injector can be independently controlled, and the injection time and injection duration of each injector can be controlled sequentially.

[0031] The fuel sequence injection control device of the present invention 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 facilitating expansion and maintenance. This not only makes the device more competitive in the current market, but also lays a solid foundation for its future application and development.

Claims

1. A fuel injection sequence control device, characterized in that: include: The fuel injector (1) is provided with a hydraulic oil chamber inside, and the movement of the fuel injection plunger is controlled by controlling the pressure of the hydraulic oil in the hydraulic oil chamber, thereby controlling the fuel injection state of the fuel injector; A three-position four-way proportional valve (2), one for each fuel injector (1), for controlling the hydraulic oil inlet or outlet of the hydraulic oil chamber of the corresponding fuel injector (1) according to the received control signal, thereby controlling the up and down movement of the fuel injection plunger to achieve control of the fuel injection timing; The window valve (3) comprises a sensor (3-1) and a multi-way valve (3-2), wherein the sensor (3-1) is used to monitor the position of the multi-way valve (3-2) in real time, and the multi-way valve (3-2) adjusts the opening and closing state of its internal channel according to a control signal to control the hydraulic oil inlet or discharge 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 a control signal to the three-position four-way proportional valve (2) and the window valve (3), and simultaneously receives the feedback signal from the window valve (3) to adjust the accuracy of the control signal, thereby ensuring accurate control of the injection timing and injection amount, and realizing linkage adjustment of optimal fuel consumption and emissions.

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 cannot move upward due to hydraulic resistance, the nozzle is closed, and no oil injection is performed; when the hydraulic oil in the hydraulic oil chamber is released, the injection plunger loses resistance, moves upward, the nozzle is opened, 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 a diesel engine control system (4). When receiving an opening signal, the hydraulic oil channel at the bottom thereof opens, and the hydraulic oil enters the hydraulic oil chamber of the injector, so that the injection plunger is kept in the lower position and the nozzle does not spray oil. When receiving a closing signal, the hydraulic oil channel is closed, and the hydraulic oil in the hydraulic oil chamber flows out through the discharge channel of the valve body, so that the injection plunger loses hydraulic resistance and sprays oil upward.

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), and 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 plunger action.

5. The fuel injection sequence control device according to claim 1, characterized in that: The control system (4) realizes linkage adjustment of diesel engine fuel consumption and emission by continuously optimizing the control algorithm to achieve optimal performance.

6. The fuel injection sequence control device according to any one of claims 1 to 5, characterized in that: The control system (4) sends a command to the window valve (3) according to 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), pushes the hydraulic plunger downward, and guides the fuel inside the injector 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 operation parameters, controls the hydraulic oil inlet or outlet of the hydraulic oil chamber in the corresponding injector (1), realizes the independent control of each injector, and sequentially controls the injection time and injection duration of each injector.

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