Diesel engine fuel injection quantity control device

Abstract

The present invention relates to the field of diesel engine control, and in particular to a diesel engine fuel injection quantity control device. The purpose of the present invention is to provide a diesel engine fuel injection quantity control device that can quickly adjust the fuel injection pressure, accurately control the fuel injection quantity, and adapt to various working conditions of the diesel engine. The technical solution is as follows: A diesel engine fuel injection quantity control device, including a fuel supply cylinder, an oil inlet control valve is fixedly connected to the right side of the fuel supply cylinder, an assembly pipe is fixedly connected to the lower side of the fuel supply cylinder, a fuel injector is installed on the lower side of the assembly pipe, and a needle valve coupling kit is installed in the fuel injector. The present invention quickly increases the fuel pressure in the fuel supply cylinder during cold start by cooperating with the oil regulating mechanism and the pressure supply mechanism, ensuring that the fuel injection pressure meets the standard, improving the fuel atomization effect, avoiding the problem of black smoke emission caused by insufficient combustion, and enhancing the power stability of the diesel engine during cold start.

Description

Technical Field

[0001] The present invention relates to the field of diesel engine control, and in particular to a diesel engine fuel injection quantity control device. Background Art

[0002] Diesel engines are widely used in commercial vehicles, construction machinery, and power generation equipment due to their advantages such as high torque, high reliability, and low fuel consumption. However, diesel engines have extremely strict control requirements for injection volume, injection pressure, and injection timing under different operating conditions such as cold start, idling, acceleration, and high load. Although traditional high-pressure common rail systems can achieve high-pressure fuel injection, during cold start, due to the low fuel temperature and high viscosity, the high-pressure oil pump is slow to build pressure, resulting in insufficient injection pressure and poor atomization, causing problems such as incomplete combustion, black smoke emissions, and unstable power output. In addition, existing systems have difficulty achieving precise control of trace amounts of fuel under different operating conditions of diesel engines. For example, they cannot quickly respond to changes in injection volume requirements under acceleration or high-load conditions, affecting the dynamic performance of the engine.

[0003] The Chinese invention patent with announcement number CN117646686B discloses a fuel injection quantity adjustment and control system, which belongs to the field of fuel injection quantity adjustment technology, including a signal transmission connector end, as well as a fuel injection hysteresis monitoring module, a hysteresis output variable control module and a supply control signal execution group; the invention sends a debugging command to the inner cavity boost output end corresponding to the inner cavity oil hysteresis generating position through the hysteresis output variable control module, changes the diameter of the oil outlet channel at the inner cavity oil hysteresis generating position, and then controls the injection pressure of the oil when passing through the hysteresis generating position, eliminates the viscous resistance of the oil fluid at the hysteresis generating position, and the lagged oil can be used as a compensation amount for reducing part of the fuel injection amount after being carried out with the next fuel injection amount after pressurization, thereby minimizing the fuel injection amount loss caused by the hysteresis phenomenon and reducing the error in fuel injection amount control; the invention does not yet have the function of quickly and timely dynamic response and adjustment of the fuel injection amount.

[0004] Therefore, there is an urgent need for a diesel engine fuel injection quantity control device that can quickly adjust the injection pressure, accurately control the injection quantity, and adapt to various working conditions of the diesel engine, so as to improve the cold start performance, fuel economy and dynamic response capability of the diesel engine. Summary of the Invention

[0005] In order to overcome the shortcomings of the current diesel engine fuel injection system, such as inaccurate fuel injection quantity control and delayed fuel injection quantity response, the purpose of the present invention is to provide a diesel engine fuel injection quantity control device that can quickly adjust the injection pressure, accurately control the fuel injection quantity, and adapt to various diesel engine operating conditions.

[0006] In order to achieve the above-mentioned purpose, the present invention discloses a diesel engine fuel injection quantity control device, comprising a fuel supply cylinder, a fuel inlet control valve fixedly connected to the right side of the fuel supply cylinder, a mounting pipe fixedly connected to the lower side of the fuel supply cylinder, a fuel nozzle installed on the lower side of the mounting pipe, a needle valve coupling kit installed in the fuel nozzle, a connecting cabin fixedly connected to the upper side of the fuel supply cylinder, an installation cabin fixedly connected to the upper side of the connecting cabin, and an assembly cabin fixedly connected to the right side of the installation cabin; a fuel supply mechanism is provided between the fuel supply cylinder and the inside of the assembly pipe, and the fuel supply mechanism controls the fuel supply through the control of the engine control system ECU. The needle valve coupling kit is controlled; an oil regulating mechanism is provided in the connecting cabin, and the oil regulating mechanism is used to adjust the volume in the oil supply cylinder; an adjusting mechanism is provided in the installation cabin, and the adjusting mechanism is used to control the operation of the oil regulating mechanism; a pressure dividing mechanism is provided at the adjusting mechanism, and the pressure dividing mechanism is used to quickly control the operating state of the adjusting mechanism; a pressure relief mechanism is provided on the lower side of the assembly cabin, and the pressure relief mechanism is used to quickly control the operating state of the adjusting mechanism; a pressure supply mechanism is provided on the upper side of the assembly cabin, and the pressure supply mechanism is used to supply high-pressure medium to the pressure dividing mechanism.

[0007] Preferably, the oil supply mechanism includes a guide frame, which is fixedly connected to the inside of the oil supply cylinder, a fixed frame is fixedly connected to the inside of the assembly tube, a guide kit is installed in the middle of the fixed frame, the lower side of the guide kit is connected to the needle valve coupling kit, the upper side of the guide kit extends into the lower side of the guide frame, an electromagnetic suction kit is installed on the lower side of the guide frame, and the moving part of the electromagnetic suction kit is connected to the upper side of the guide kit.

[0008] Preferably, the oil regulating mechanism comprises an oil regulating pipe, the oil regulating pipe is fixedly connected to the interior of the connecting cabin, and an oil regulating piston is mounted in the oil regulating pipe in a sliding and sealing manner.

[0009] Preferably, the regulating mechanism includes a regulating tube, which is fixedly connected to the installation cabin. A regulating piston is mounted in the regulating tube in a sliding and sealing manner, and a connecting rod is fixedly connected between the regulating piston and the oil regulating piston.

[0010] Preferably, the pressure dividing mechanism includes an annular tube, and there are two annular tubes, which are fixedly connected to the upper and lower sides of the regulating tube respectively. Each annular tube is installed with multiple pressure control valves, and the multiple pressure control valves installed on each annular tube are respectively installed at the upper and lower sides of the regulating tube. Each pressure control valve is interconnected with the annular tube, and each pressure control valve is interconnected with the regulating tube. An interconnecting tee is fixedly connected between the right sides of the two annular tubes, and the two annular tubes are interconnected through the interconnecting tee, and the interconnecting tee is connected to the pressure supply mechanism.

[0011] Preferably, the pressure relief mechanism includes a reflux chamber, which is fixedly connected to the lower side of the assembly chamber. A liquid pump is installed on the upper side of the reflux chamber, and the extraction end of the liquid pump extends into the lower side of the reflux chamber. The output end of the liquid pump is connected to the pressure supply mechanism. Two sets of reflux pipes are fixedly connected to the left and upper sides of the reflux chamber, and a pressure relief control valve is installed at the other end of the reflux pipe. The two pressure relief control valves on the left are connected to the lower side of the regulating pipe, and the two pressure relief control valves on the upper side are connected to the upper side of the regulating pipe.

[0012] Preferably, the pressure supply mechanism includes a pressure supply pipe, which is fixedly connected to the upper side of the assembly cabin, and a pressure supply piston is installed in the pressure supply pipe in a sliding and sealing manner. An electric push rod is installed on the right side of the pressure supply pipe, and the left end of the electric push rod moving part is fixedly connected to the right side of the pressure supply piston. A connecting pipe is fixedly connected to the left side of the pressure supply pipe, and the left side of the connecting pipe is connected to and communicates with the right side of the interconnecting tee, and a pipe pressure sensor is installed on the left side of the pressure supply pipe.

[0013] Preferably, it further comprises an oil cylinder sensor module, which is installed on the left side of the oil supply cylinder and is used to detect the internal pressure in the oil supply cylinder.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention rapidly increases the fuel pressure in the fuel supply cylinder during cold start by cooperating with the oil regulating mechanism and the pressure supply mechanism, thereby ensuring that the injection pressure meets the standard, improving the fuel atomization effect, avoiding the problem of black smoke emission caused by incomplete combustion, and enhancing the power stability of the diesel engine during cold start.

[0015] 2. The present invention adopts a fast-response design of a pressure-dividing mechanism and a pressure-relieving mechanism, combined with precise control by the engine control system ECU, to dynamically adjust the position of the oil regulating piston, thereby achieving precise regulation of the injection pressure per unit time, thereby meeting the injection quantity requirements under different operating conditions such as idling, acceleration, and high load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ;

[0017] Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ;

[0018] Figure 3 It is a schematic diagram of the cutaway three-dimensional structure of the present invention;

[0019] Figure 4 The partially cutaway three-dimensional structure of the present invention is shown Figure 1 ;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the oil supply mechanism of the present invention;

[0021] Figure 6 The partially cutaway three-dimensional structure of the present invention is shown Figure 2 ;

[0022] Figure 7 The partially cutaway three-dimensional structure of the present invention is shown Figure 3 ;

[0023] Figure 8 It is a schematic diagram of the cutaway three-dimensional structure of the adjustment mechanism of the present invention;

[0024] Figure 9 It is a schematic diagram of the cutaway three-dimensional structure of the pressure supply mechanism of the present invention;

[0025] Figure 10 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 1 ;

[0026] Figure 11 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 2 ;

[0027] Figure 12 Schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention Figure 1 ;

[0028] Figure 13 Schematic diagram of the three-dimensional structure of the voltage dividing mechanism of the present invention;

[0029] Figure 14 Schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention Figure 2 ;

[0030] Figure 15 Schematic diagram of the three-dimensional structure of the pressure relief mechanism of the present invention;

[0031] Figure 16 Schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention Figure 3 ;

[0032] Figure 17 It is a schematic diagram of the three-dimensional structure of the pressure supply mechanism of the present invention.

[0033] Figure Number:

[0034] 1. Oil supply cylinder, 1001. Oil inlet control valve, 2. Assembly pipe, 3. Oil nozzle, 4. Needle valve coupling kit, 5. Connection cabin, 6. Installation cabin, 7. Assembly cabin, 8. Oil supply mechanism, 9. Oil adjustment mechanism, 10. Adjustment mechanism, 11. Pressure dividing mechanism, 12. Pressure relief mechanism, 13. Pressure supply mechanism, 81. Guide frame, 82. Fixing frame, 83. Guide kit, 84. Electromagnetic suction kit, 91. Oil adjustment pipe, 92. Oil regulating piston, 101, regulating pipe, 102, regulating piston, 103, connecting rod, 111, annular pipe, 112, inlet pressure control valve, 113, interconnecting tee, 121, reflux chamber, 122, liquid pump, 123, reflux pipe, 124, pressure relief control valve, 131, pressure supply pipe, 132, pressure supply piston, 133, electric push rod, 134, connecting pipe, 135, pipe pressure sensor, 14, cylinder sensor module. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1 To the attached Figure 17 The principles and features of the present invention are described in detail with reference to the accompanying drawings and embodiments; the examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0036] A diesel engine fuel injection quantity control device, as shown in the figure, includes a fuel supply cylinder 1, a fuel inlet control valve 1001, an assembly pipe 2, a fuel injector 3, a needle valve coupling kit 4, a connecting compartment 5, an installation compartment 6, an assembly compartment 7, a fuel supply mechanism 8, an oil adjustment mechanism 9, a regulating mechanism 10, a pressure dividing mechanism 11, a pressure relief mechanism 12, and a pressure supply mechanism 13. The fuel supply cylinder 1 is a hollow cavity structure with an open bottom. The fuel inlet control valve 1001 is fixedly connected to the right side of the fuel supply cylinder 1. The fuel inlet control valve 1001 is a pulsed, normally open solenoid valve that connects to the diesel engine's high-pressure common rail fuel supply system. The fuel inlet control valve 1001 controls the flow of oil between the diesel engine's high-pressure common rail system and the fuel supply cylinder 1. The assembly pipe 2 is fixedly connected to the lower side of the fuel supply cylinder 1. The assembly pipe 2 is a hollow pipe structure, and its outer periphery is mounted on the upper side of the diesel engine's cylinder head. A fuel injector 3 is installed on the lower side of the assembly pipe 2. The fuel injector 3 is installed in the cylinder head of the diesel engine to spray atomized fuel therein. A needle valve coupling kit 4 is installed in the fuel injector 3. The needle valve coupling kit 4 is used to control the on and off of the fuel injection of the fuel injector 3. A connecting cabin 5 is fixedly connected to the upper side of the fuel supply cylinder 1. An installation cabin 6 is fixedly connected to the upper side of the connecting cabin 5. An assembly cabin 7 is fixedly connected to the right side of the installation cabin 6. The assembly cabin 7 is used to be installed on the upper side of the diesel engine frame. A fuel supply mechanism 8 is provided between the fuel supply cylinder 1 and the inside of the assembly pipe 2. The fuel supply mechanism 8 is connected to the needle valve coupling kit 4. The fuel supply mechanism 8 controls the needle valve coupling kit 4 through the control of the engine control system ECU, so that the fuel supply mechanism 8 controls the timing and duration of the coordination between the needle valve coupling kit 4 and the fuel injector 3, so that the fuel injector 3 can achieve fuel injection at different times and for different durations. An oil regulating mechanism 9 is installed within the connection compartment 5 and is connected to the oil supply cylinder 1. The oil regulating mechanism 9 is used to adjust the volume, and thereby the pressure, within the oil supply cylinder 1. A regulating mechanism 10 is installed within the installation compartment 6 and is connected to the oil regulating mechanism 9. The regulating mechanism 10 is also equipped with a pressure dividing mechanism 11, which is used to quickly control the operating status of the regulating mechanism 10. A pressure relief mechanism 12 is installed below the assembly compartment 7 and is connected to the regulating mechanism 10. The pressure relief mechanism 12 is used to quickly control the operating status of the regulating mechanism 10. A pressure supply mechanism 13 is installed above the assembly compartment 7 and is connected to both the pressure dividing mechanism 11 and the pressure relief mechanism 12. The pressure supply mechanism 13 is used to supply high-pressure medium to the pressure dividing mechanism 11. This high-pressure medium supplied by the pressure supply mechanism 13, through the pressure dividing mechanism 11, quickly controls the regulating mechanism 10, thereby controlling the rapid response of the oil regulating mechanism 9. The pressure dividing mechanism 11 , the pressure relief mechanism 12 and the pressure supply mechanism 13 are controlled by the engine control system ECU.

[0037] The oil supply mechanism 8 includes a guide frame 81 , a fixing frame 82 , a guide kit 83 and an electromagnetic attraction kit 84 . The guide frame 81 is fixedly connected to the inside of the oil supply cylinder 1. The guide frame 81 is a structure with an open upper side. The guide frame 81 is a structure with a cone in the middle. The guide frame 81 is a structure with multiple oil holes in the middle surface layer. The guide frame 81 is a structure with a box in the middle of the lower side. The assembly tube 2 is fixedly connected to the inside of the fixing frame 82. The fixing frame 82 is a structure with oil holes. A guide kit 83 is installed in the middle of the fixing frame 82. The guide kit 83 is vertically arranged. The guide kit 83 is a moving pair with elastic reset. The lower side of the moving part of the guide kit 83 is connected to the needle structure of the needle valve coupling kit 4. The upper side of the moving part of the guide kit 83 extends into the lower box structure of the guide frame 81 in a sliding and sealing manner. An electromagnetic attraction kit 84 is installed in the lower box structure of the guide frame 81. The moving part of the electromagnetic attraction kit 84 is connected to the upper end face of the moving part of the guide kit 83. The electromagnetic attraction kit 84 is controlled by the engine control system ECU.

[0038] The oil regulating mechanism 9 includes an oil regulating pipe 91 and an oil regulating piston 92. The oil regulating pipe 91 is fixedly connected to the inside of the connecting cabin 5. The oil regulating pipe 91 is a hollow pipe structure. The lower side of the oil regulating pipe 91 is communicated with the oil supply cylinder 1. The oil regulating piston 92 is installed in the oil regulating pipe 91 in a sliding and sealing manner. The oil regulating piston 92 divides the oil supply cylinder 1 into two upper and lower chambers. The upper and lower positions of the oil regulating piston 92 in the oil regulating pipe 91 determine the volume and pressure in the oil supply cylinder 1.

[0039] The adjusting mechanism 10 includes an adjusting tube 101, an adjusting piston 102 and a connecting rod 103. The adjusting tube 101 is fixedly connected to the installation cabin 6. The adjusting tube 101 is a hollow cavity structure. The adjusting piston 102 is installed in the adjusting tube 101 in a sliding and sealing manner. The adjusting piston 102 divides the adjusting tube 101 into two upper and lower chambers. A connecting rod 103 is fixedly connected between the adjusting piston 102 and the oil regulating piston 92.

[0040] The pressure dividing mechanism 11 includes an annular tube 111, an inlet pressure control valve 112 and an interconnecting tee 113. There are two annular tubes 111, which are fixedly connected to the upper and lower sides of the regulating tube 101 respectively. The annular tubes 111 are all annular hollow pipe structures. Each annular tube 111 is equipped with multiple inlet pressure control valves 112, which are all pulse-type normally closed solenoid valves. The inlet pressure control valves 112 are all controlled by the engine control system ECU. The multiple inlet pressure control valves 112 installed on each annular tube 111 are respectively installed at the upper and lower sides of the regulating tube 101, each inlet pressure control valve 112 is interconnected with the annular tube 111, and each inlet pressure control valve 112 is interconnected with the regulating tube 101. An interconnecting tee 113 is fixedly connected between the right sides of the two annular tubes 111, and the two annular tubes 111 are interconnected through the interconnecting tee 113, and the interconnecting tee 113 is connected to the pressure supply mechanism 13.

[0041] The pressure relief mechanism 12 includes a reflux chamber 121, a liquid pump 122, a reflux pipe 123 and a pressure relief control valve 124. The reflux chamber 121 is fixedly connected to the lower side of the assembly chamber 7. The reflux chamber 121 is a structure with a one-way valve for balancing the air pressure. The one-way valve structure of the reflux chamber 121 is used to balance the internal and external air pressure when the medium refluxes therein. The liquid pump 122 is installed on the upper side of the reflux chamber 121. The extraction end of the liquid pump 122 extends into the lower side of the reflux chamber 121. The output end of the liquid pump 122 is connected to the pressure supply mechanism 13. Two sets of reflux pipes 123 are fixedly connected to the left and upper sides of the reflux chamber 121. The other ends of the reflux pipes 123 are A pressure relief control valve 124 is installed, and the pressure relief control valve 124 is a pulse normally closed solenoid valve. The pressure relief control valve 124 is controlled by the engine control system ECU. The two pressure relief control valves 124 connected to the two groups of return pipes 123 located on the left side of the reflux chamber 121 are both connected to the lower side of the regulating pipe 101, and the two pressure relief control valves 124 connected to the two groups of return pipes 123 located on the upper side of the reflux chamber 121 are both connected to the upper side of the regulating pipe 101. The two pressure relief control valves 124 located on the lower side are communicated with the lower chamber of the regulating pipe 101, and the two pressure relief control valves 124 located on the upper side are communicated with the upper chamber of the regulating pipe 101.

[0042] The pressure supply mechanism 13 includes a pressure supply pipe 131, a pressure supply piston 132, an electric push rod 133, a connecting pipe 134 and a pipe pressure sensor 135. The pressure supply pipe 131 is fixedly connected to the upper side of the assembly cabin 7. The pressure supply pipe 131 is a hollow cavity structure. The left side of the hollow cavity structure of the pressure supply pipe 131 is a conical contraction mouth structure. The pressure supply piston 132 is mounted in a sliding seal in the pressure supply pipe 131. An electric push rod 133 is installed on the right side of the pressure supply pipe 131. The electric push rod 133 is a horizontal screw-type moving pair. The left end of the moving part of the electric push rod 133 is fixed. Connected to the right side of the pressure supply piston 132, a connecting pipe 134 is fixedly connected to the conical contraction structure on the left side of the pressure supply pipe 131. The connecting pipe 134 is a stepped pipe structure with a diameter gradually decreasing to the left, so that the pressure supply pipe 131 and the connecting pipe 134 form a structure from large diameter to small diameter. The left side of the connecting pipe 134 is connected to the right side of the interconnecting tee 113 and is interconnected. A pipe pressure sensor 135 is installed on the left side of the pressure supply pipe 131. The pipe pressure sensor 135 is used to monitor the pressure in the pressure supply pipe 131. The pipe pressure sensor 135 is controlled by the engine control system ECU.

[0043] It also includes a cylinder sensor module 14, which is installed on the left side of the fuel supply cylinder 1. The cylinder sensor module 14 is a pressure sensor module. The cylinder sensor module 14 is used to detect the internal pressure in the fuel supply cylinder 1. By detecting the internal pressure change value in the fuel supply cylinder 1, the engine control system ECU can accurately analyze the pressure value change before and after the fuel is injected through the injector 3, and further enable the engine control system ECU to accurately control the position of the oil regulating piston 92 in the oil regulating pipe 91, and further enable the engine control system ECU to control the operating time of the electromagnetic attraction kit 84.

[0044] Furthermore, the assembly pipe 2 of the diesel engine fuel injection quantity control device is installed on the diesel engine cylinder head, and the fuel injector 3 is installed in the diesel engine cylinder head; the diesel engine fuel injection quantity control device is installed on the upper side of the engine frame through the assembly cabin 7; the oil inlet control valve 1001 of the diesel engine fuel injection quantity control device is connected to the high-pressure common rail fuel supply system of the diesel engine; a pressurized medium with antifreeze properties, such as antifreeze hydraulic oil, is input into the pressure supply pipe 131 so that the pressurized medium fills the pressure supply pipe 131, the connecting pipe 134, the interconnecting tee 113, the annular pipe 111, the inlet pressure control valve 112, the upper and lower chambers of the regulating pipe 101, the pressure relief control valve 124, the return pipe 123 and the return cabin 121; and the power supply and control lines of the oil inlet control valve 1001, the electromagnetic suction kit 84, the inlet pressure control valve 112, the pressure relief control valve 124 and the pipe pressure sensor 135 are connected to the engine control module ECU.

[0045] The pre-startup operation of the diesel engine fuel injection quantity control device is set as follows: the pipe pressure sensor 135 is started, and the pipe pressure sensor 135 will monitor the pressure of the pressurized medium in the pressure supply pipe 131, so that the electric push rod 133 drives the pressure supply piston 132 to move left to squeeze the pressurized medium in the pressure supply pipe 131, so that the pressure of the squeezed medium increases until it reaches the set value of the pipe pressure sensor 135. The set value of the pipe pressure sensor 135 is greater than the pressure of the high-pressure common rail fuel supply system of the diesel engine, and the high-pressure common rail fuel supply system of the diesel engine is greater than the pressure in the diesel engine cylinder at the maximum compression stroke; after the diesel engine is shut down, the pipe pressure sensor 135 will also be turned off.

[0046] The working principle of the diesel engine injection quantity control device for cold start boosting is as follows: ① The pressure supply pipe 131 is pressurized. When the diesel engine is cold started, the engine control system ECU will first start the starting gear of the diesel engine starter to engage with the engine crankshaft gear after analyzing the data from various engine sensors. At the same time, the engine control system ECU will also synchronously turn on the pipe pressure sensor 135. The pipe pressure sensor 135 will start the electric push rod 133 according to the pressure in the pressure supply pipe 131 it monitors, so that the electric push rod 133 pressurizes the pressurized medium in the pressure supply pipe 131 to a set value by pushing the pressure supply piston 132. The electric push rod 133 can achieve the structure from large diameter to small diameter formed by the pressure supply pipe 131 and the connecting pipe 134. The pressurized medium in the pressure supply pipe 131 is pressurized with a small stroke and quickly, so that the pressure of the pressurized medium in the interconnecting tee 113 and the annular pipe 111 reaches the set value. This pressurization process of the pressure supply pipe 131 can be completed within the process of the diesel engine starter gear moving to engage with the engine crankshaft gear; ② Fuel delivery. When the diesel engine starter gear drives the engine crankshaft to rotate, the diesel engine's oil pump and high-pressure common rail fuel supply system will also begin to supply oil to the oil inlet control valve 1001 and the fuel supply cylinder 1. The fuel will be filled into the fuel supply cylinder 1, the assembly pipe 2 and the lower chamber of the oil adjustment pipe 91 through the high-pressure common rail fuel supply system. The high-pressure common rail fuel supply system will also maintain a continuous supply of oil to the fuel supply cylinder 1, the assembly pipe 2 and the lower chamber of the oil adjustment pipe 91;③ Pressurize the fuel cylinder 1. Due to factors such as fuel reflux, reduced fuel temperature, and high fuel viscosity, the current high-pressure common rail fuel supply system has insufficient oil pressure during cold start, and is unable to quickly increase pressure during cold start of the diesel engine, resulting in insufficient fuel pressure, insufficient atomization, and insufficient fuel injection volume injected into the engine cylinder combustion chamber. As a result, the current diesel engine does not burn enough fuel to produce black smoke during cold start, and the output power is also unstable. Therefore, when the diesel engine cylinder piston has not run to the maximum compression stroke, the engine control system ECU will compare and analyze the pressure of the monitored high-pressure common rail fuel supply system with the standard injection pressure required by the engine cylinder, and calculate the required To replenish the pressure in the oil supply cylinder 1, the engine control system ECU will control the oil inlet control valve 1001 to close, so that the oil supply cylinder 1 is in a closed state. At the same time, according to the pressure value required to be replenished, the upper pressure inlet control valve 112 is controlled to open and the two lower pressure relief control valves 124 are closed, so that the high-pressure pressurized medium in the pressure supply pipe 131 is input into the upper chamber of the regulating pipe 101. The increase in the pressure in the upper chamber of the regulating pipe 101 will cause the regulating piston 102 to move downward, and the regulating piston 102 will cause the pressurized medium in the lower chamber of the regulating pipe 101 to be output to the reflux chamber 121 through the two lower pressure relief control valves 124, and the regulating piston 102 will also drive the oil regulating piston 92 to move downward through the connecting rod 103. The movement will increase the fuel pressure in the fuel supply cylinder 1 and the assembly pipe 2, thereby completing the pressurization of the fuel in the fuel supply cylinder 1. This process can be completed when the diesel engine cylinder piston has not reached the maximum compression stroke; ④ Fuel injection, when the diesel engine cylinder piston is about to reach the maximum compression stroke, the engine control system ECU will again analyze the data from various engine sensors, and control the electromagnetic suction kit 84 to drive the needle valve coupling kit 4 to move upward, so that the pressurized fuel in the fuel supply cylinder 1 and the assembly pipe 2 is sprayed into the cylinder through the injector 3, and the operating timing and operating duration of the electromagnetic suction kit 84 are controlled by the engine ECU. In this way, when the diesel engine is cold started, the injection pressure into the engine cylinder can be guaranteed to meet the standard. , when the injection pressure meets the standard, the engine control system ECU precisely controls the operation timing and operation time of the electromagnetic suction kit 84, so as to control the fuel quantity injected into the engine cylinder and the degree of atomization to be sufficient, thereby ensuring that the fuel can be fully burned during cold start; ⑤ reset process, after the operation time of the electromagnetic suction kit 84 precisely controlled by the engine control system ECU is completed, the electromagnetic suction kit 84 is powered off, and the needle valve coupling kit 4 will also be reset through the guide kit 83, so that the fuel injector 3 is closed. At the same time, the engine control system ECU will also control the oil inlet control valve 1001 to be powered off to reconnect the oil circuit. At this time, the high-pressure common rail fuel supply system will once again input fuel into the fuel supply cylinder 1 through the oil inlet control valve 1001;At the same time, the engine control system ECU will also control the upper pressure inlet control valve 112 to close, the two upper pressure relief control valves 124 to open, the lower pressure inlet control valve 112 to open, and the lower pressure relief control valve 124 to close. At this time, the high-pressure pressurized medium in the pressure supply pipe 131 will be input into the lower chamber in the regulating pipe 101 through the interconnecting tee 113, thereby resetting the regulating piston 102. This process occurs when the diesel engine cylinder piston enters the power stroke after a fuel injection compression ignition and has not yet reached the next maximum compression stroke. ⑥ Cycle process, when the next maximum compression stroke is about to occur, the above process continues to cycle until the high-pressure common rail fuel supply system of the diesel engine is pressurized to the set value and the fuel injected into the diesel engine is When the oil pressure reaches the standard value independently through the high-pressure common rail fuel supply system, the diesel engine injection quantity control device completes the cold start boost process; ⑥ To stabilize the pressure of the pressure supply pipe 131, the electric push rod 133 will be controlled by the pipe pressure sensor 135 in real time and operate to keep the pressure of the pressurized medium in the pressure supply pipe 131 within the set range. When the running length of the electric push rod 133 is about to reach its end, the liquid pump 122 will extract the pressurized medium from the return chamber 121 and pump it into the pressure supply pipe 131. At the same time, the moving part of the electric push rod 133 will also move to the right to expand the space for accommodating the pressurized medium in the pressure supply pipe 131. The liquid pump 122 and the electric push rod 133 are synchronously controlled to maintain the pressure of the pressurized medium in the pressure supply pipe 131.

[0047] The working principle of the diesel engine fuel injection quantity control device for fine-tuning the fuel injection quantity during the operation of the diesel engine is as follows: as the diesel engine runs, the temperature of the diesel engine cylinder gradually rises, the lubrication of various moving parts is in place, the fluidity of the fuel temperature increases, and the moving parts expand with the temperature rise; the multiple pressure inlet control valves 112 and the pressure relief control valve 124 on the upper and lower sides will be under the algorithm control of the engine control system ECU, and the pressure is supplied by the pressurized medium of the pressure supply pipe 131. When the engine control system ECU controls the electromagnetic suction kit 84 to spray fuel through the fuel injector 3, the position of the oil regulating piston 92 in the oil regulating pipe 91 can be accurately controlled, so that the oil regulating piston 92 can accurately adjust the injection pressure within the unit injection time of the fuel injector 3, and then accurately produce different fuel injection quantities according to the diesel engine working conditions within the unit injection time, so as to achieve a suitable amount of fuel in the diesel engine cylinder.

[0048] In addition, in the idling condition of the diesel engine, in order to ensure stable combustion of the diesel engine, reduce vibration, and avoid excessive or insufficient fuel injection, the oil regulating mechanism 9 can maintain a stable oil pressure slightly higher than the pressure of the high-pressure common rail fuel supply system by slightly adjusting the volume of the fuel supply cylinder 1, thereby ensuring the atomization quality of small-flow fuel injection; the electromagnetic attraction kit 84 controls the opening and closing of the needle valve coupling kit 4 with high frequency and short pulses to achieve micro-fuel injection, meeting the requirements of low fuel consumption at idling.

[0049] In addition, when the diesel engine is accelerating or working under high load conditions, in order to make the diesel engine instantly increase the injection volume, avoid turbo lag, and improve power response, the pressure dividing mechanism 11 and the pressure relief mechanism 12 can cooperate with each other to quickly adjust the position of the oil regulating piston 92, increase the pressure of the oil supply cylinder 1, and ensure a high injection rate; the engine control system ECU extends the power-on time of the electromagnetic attraction kit 84, combines the high-pressure oil pressure to achieve large-volume oil injection, and at the same time feedbacks the real-time pressure correction through the oil cylinder sensor module 14.

[0050] In addition, when the diesel engine is in high temperature operation or hot engine state, the viscosity of the fuel decreases and the pressure of the high-pressure common rail fuel supply system is stable. In order to prevent overheating and expansion from affecting the accuracy, the oil adjustment mechanism 9 can reduce the compensation for the pressure of the high-pressure common rail fuel supply system, so that the high-pressure common rail fuel supply system can supply pressure independently, reducing the load of the adjustment mechanism 10; if the cylinder sensor module 14 detects an abnormal increase in pressure, that is, thermal expansion, the oil adjustment piston 92 is controlled to move upward to reduce the pressure in the fuel supply cylinder 1, thereby avoiding overpressure injection.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A diesel engine fuel injection quantity control device, comprising a fuel supply cylinder (1), characterized in that: The right side of the oil supply cylinder (1) is fixedly connected to an oil inlet control valve (1001), the lower side of the oil supply cylinder (1) is fixedly connected to an assembly pipe (2), the lower side of the assembly pipe (2) is installed with an oil nozzle (3), and a needle valve coupling kit (4) is installed in the oil nozzle (3), the upper side of the oil supply cylinder (1) is fixedly connected to a connection cabin (5), the upper side of the connection cabin (5) is fixedly connected to an installation cabin (6), and the right side of the installation cabin (6) is fixedly connected to an assembly cabin (7); An oil supply mechanism (8) is provided between the oil supply cylinder (1) and the interior of the assembly pipe (2), and the oil supply mechanism (8) controls the needle valve coupling kit (4) through the control of an engine control system ECU; An oil regulating mechanism (9) is provided in the connecting cabin (5), and the oil regulating mechanism (9) is used to regulate the volume in the oil supply cylinder (1); A regulating mechanism (10) is provided in the installation cabin (6), and the regulating mechanism (10) is used to control the operation of the oil regulating mechanism (9). A pressure dividing mechanism (11) is provided at the regulating mechanism (10), and the pressure dividing mechanism (11) is used to quickly control the operating state of the regulating mechanism (10). A pressure relief mechanism (12) is provided on the lower side of the assembly cabin (7), and the pressure relief mechanism (12) is used to quickly control the operating state of the regulating mechanism (10). A pressure supply mechanism (13) is provided on the upper side of the assembly cabin (7), and the pressure supply mechanism (13) is used to supply high-pressure medium to the pressure dividing mechanism (11).

2. The diesel engine fuel injection quantity control device according to claim 1, characterized in that: The oil supply mechanism (8) includes a guide frame (81), the guide frame (81) is fixedly connected to the inside of the oil supply cylinder (1), the assembly tube (2) is fixedly connected to a fixed frame (82), a guide kit (83) is installed in the middle of the fixed frame (82), the lower side of the guide kit (83) is connected to the needle valve coupling kit (4), the upper side of the guide kit (83) extends into the lower side of the guide frame (81), the lower side of the guide frame (81) is installed with an electromagnetic attraction kit (84), and the moving part of the electromagnetic attraction kit (84) is connected to the upper side of the guide kit (83).

3. The diesel engine fuel injection quantity control device according to claim 2, characterized in that: The oil regulating mechanism (9) comprises an oil regulating pipe (91), the oil regulating pipe (91) being fixedly connected to the interior of the connecting cabin (5), and an oil regulating piston (92) being sleeved in the oil regulating pipe (91) in a sliding and sealing manner.

4. The diesel engine fuel injection quantity control device according to claim 3, characterized in that: The regulating mechanism (10) comprises a regulating tube (101), the regulating tube (101) being fixedly connected to the installation chamber (6), a regulating piston (102) being sheathed in the regulating tube (101) in a sliding and sealing manner, and a connecting rod (103) being fixedly connected between the regulating piston (102) and the oil regulating piston (92).

5. The diesel engine fuel injection quantity control device according to claim 4, characterized in that: The pressure dividing mechanism (11) comprises an annular tube (111), wherein the number of the annular tubes (111) is two, and the annular tubes (111) are fixedly connected to the upper and lower sides of the regulating tube (101), and each annular tube (111) is provided with a plurality of pressure control valves (112). The plurality of pressure control valves (112) installed on each annular tube (111) are installed at the upper and lower sides of the regulating tube (101), and each pressure control valve (112) is interconnected with the annular tube (111). Each pressure control valve (112) is interconnected with the regulating tube (101). An interconnecting tee (113) is fixedly connected between the right sides of the two annular tubes (111), and the two annular tubes (111) are interconnected through the interconnecting tee (113). The interconnecting tee (113) is connected to the pressure supply mechanism (13).

6. The diesel engine fuel injection quantity control device according to claim 5, characterized in that: The pressure relief mechanism (12) includes a reflux chamber (121), the reflux chamber (121) is fixedly connected to the lower side of the assembly chamber (7), a liquid pump (122) is installed on the upper side of the reflux chamber (121), the extraction end of the liquid pump (122) extends into the lower side of the reflux chamber (121), the output end of the liquid pump (122) is connected to the pressure supply mechanism (13), two groups of reflux pipes (123) are fixedly connected to the left and upper sides of the reflux chamber (121), and the other ends of the reflux pipes (123) are installed with pressure relief control valves (124), the two pressure relief control valves (124) on the left are connected to the lower side of the regulating pipe (101), and the two pressure relief control valves (124) on the upper side are connected to the upper side of the regulating pipe (101).

7. The diesel engine fuel injection quantity control device according to claim 6, characterized in that: The pressure supply mechanism (13) includes a pressure supply pipe (131), the pressure supply pipe (131) is fixedly connected to the upper side of the assembly cabin (7), a pressure supply piston (132) is mounted in the pressure supply pipe (131) in a sliding and sealing manner, an electric push rod (133) is installed on the right side of the pressure supply pipe (131), the left end of the moving part of the electric push rod (133) is fixedly connected to the right side of the pressure supply piston (132), a connecting pipe (134) is fixedly connected to the left side of the pressure supply pipe (131), the left side of the connecting pipe (134) is connected to and communicates with the right side of the interconnecting tee (113), and a pipe pressure sensor (135) is installed on the left side of the pressure supply pipe (131).

8. The diesel engine fuel injection quantity control device according to claim 7, characterized in that: It also includes an oil cylinder sensor module (14), which is installed on the left side of the oil supply cylinder (1). The oil cylinder sensor module (14) is used to detect the internal pressure in the oil supply cylinder (1).

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