CN115750111A - Low-speed engine oil injection control device, low-speed engine and low-speed engine oil injection control method - Google Patents

Abstract

The invention discloses a low-speed engine fuel injection control device, a low-speed engine and a low-speed engine fuel injection control method. The low-speed engine fuel injection control device includes an angle sensor, a rotational speed sensor, a complete machine control module and n cylinder control modules; For measuring the crankshaft angle of the first cylinder, the speed sensor is used to measure the crankshaft speed; the first cylinder corresponds to the first cylinder control module; the whole machine control module is used to receive the fuel injection angle parameter and send it to each cylinder control module; the first The cylinder control module is used to obtain the crankshaft angle and crankshaft speed of the first cylinder, and send them to the second cylinder control module; each cylinder control module is used to obtain the crankshaft of the corresponding cylinder according to the fuel injection angle parameter, the crankshaft speed and the cylinder control module. Angle controls the fuel injection of the cylinder corresponding to the cylinder control module, which solves the problem of synchronous fuel injection and drive control of the engine, and at the same time can improve the real-time performance of each cylinder control and simplify wiring.

Description

A low-speed engine fuel injection control device, a low-speed engine and a low-speed engine injection oil control method

technical field

The invention relates to the technical field of fuel injection control, in particular to a low-speed engine fuel injection control device, a low-speed engine and a low-speed engine fuel injection control method.

Background technique

The low-speed engine has multiple cylinders, and it needs to control the fuel injection of multiple cylinders. The fuel injection control needs to be precise, and the fuel injection control is extremely complicated. Using a control device to connect all the cylinders makes the connection relationship very confusing, and it is impossible to achieve better fuel injection control. .

Contents of the invention

The invention provides a fuel injection control device for a low-speed engine, a low-speed engine and a fuel injection control method for a low-speed engine, which solves the problem of synchronous fuel injection and drive control of the low-speed engine, improves real-time control of each cylinder and simplifies wiring.

According to one aspect of the present invention, a low-speed engine fuel injection control device is provided, and the fuel injection control device includes:

An angle sensor, a speed sensor, a complete machine control module and n cylinder control modules; the n cylinder control modules correspond to the n cylinders of the low-speed engine; wherein, n is a positive integer greater than or equal to 2;

The n cylinders include the first cylinder, the angle sensor is used to measure the crankshaft angle of the first cylinder of the first cylinder, and the rotational speed sensor is used to measure the crankshaft speed of the first cylinder; the first cylinder is controlled by the first cylinder in the n cylinder control module module correspondence;

The whole machine control module is used to receive the fuel injection angle parameter configured by the user, and send the fuel injection angle parameter to each cylinder control module;

The first cylinder control module is used to obtain the crankshaft angle of the first cylinder measured by the angle sensor and the crankshaft speed measured by the speed sensor, and send the crankshaft angle and the crankshaft speed of the first cylinder to the second cylinder control module;

The i-th cylinder control module is used to calculate the i-th cylinder crankshaft angle of the i-th cylinder according to the first cylinder crankshaft angle and crankshaft speed after receiving the first cylinder crankshaft angle and crankshaft speed sent by the i-1th cylinder control module; i is an integer greater than 1 and less than n;

Each cylinder control module is used to control the fuel injection of the cylinder corresponding to the cylinder control module according to the fuel injection angle parameter, the crankshaft speed and the crankshaft angle of the cylinder corresponding to the cylinder control module.

Further, the first cylinder control module is also used to send the first cylinder crankshaft angle and crankshaft speed to the complete machine control module;

The whole machine control module is used to send the first cylinder crankshaft angle and crankshaft speed to the first cylinder control module;

The first cylinder control module is used to send the first cylinder crankshaft angle and crankshaft speed to the second cylinder control module after receiving the first cylinder crankshaft angle and crankshaft speed sent by the complete machine control module;

The i-th cylinder control module is also used to send the first cylinder crankshaft angle, the second cylinder crankshaft angle ... the i-1th cylinder crankshaft angle, the i-th cylinder crankshaft angle and the crankshaft speed to the i+1th cylinder control module; i is An integer greater than 1 and less than n;

The nth cylinder control module is used to send the crankshaft angle and crankshaft speed of each cylinder to the overall machine control module.

Further, the cylinder control module includes an angle simulation unit and an angle drive unit;

The angle simulation unit of the i-th cylinder control module is used to determine the time difference between the time when the i-th cylinder control module receives the crankshaft angle of the first cylinder and the time when the angle sensor measures the crankshaft angle of the first cylinder, and determines the crankshaft of the first cylinder at the current moment according to the time difference and the crankshaft speed Angle, and according to the crankshaft angle of the first cylinder at the current moment, and the crankshaft offset angle between the ith cylinder and the first cylinder, determine the i-th cylinder crankshaft angle of the i-th cylinder;

The angle drive unit of the control module of the i-th cylinder is used to control the fuel injection of the i-th cylinder according to the parameters of the i-th cylinder crankshaft angle, crankshaft speed and fuel injection angle.

Further, the fuel injection angle parameter includes a fuel injection start angle and a fuel injection end angle, or, the fuel injection angle parameter includes a fuel injection start angle and a fuel injection duration.

Further, the cylinder control module includes FPGA.

Further, the communication between the control module of the whole machine and the control module of the cylinder, as well as between the control modules of each cylinder, is through the EtherCAT protocol.

Further, the whole machine control module is used to receive the fuel injection angle parameter configured by the user through the CAN protocol.

According to another aspect of the present invention, a low-speed engine is provided, and the low-speed engine includes the low-speed engine fuel injection control device described in the low-speed engine fuel injection control device.

According to another aspect of the present invention, a low-speed engine fuel injection control method is provided. The low-speed engine fuel injection control device includes an angle sensor, a rotational speed sensor, a complete machine control module and n cylinder control modules; n cylinder control modules and low-speed The n cylinders of the engine correspond one-to-one; wherein, n is a positive integer greater than or equal to 2; the n cylinders include the first cylinder, the angle sensor is used to measure the crankshaft angle of the first cylinder of the first cylinder, and the speed sensor is used to measure the first cylinder crank angle. The crankshaft speed of a cylinder; the first cylinder corresponds to the first cylinder control module in the n cylinder control modules;

Low speed engine fuel injection control methods include:

The whole machine control module receives the fuel injection angle parameter configured by the user, and sends the fuel injection angle parameter to each cylinder control module;

The first cylinder control module obtains the crankshaft angle of the first cylinder measured by the angle sensor and the crankshaft speed measured by the speed sensor, and sends the crankshaft angle and the crankshaft speed of the first cylinder to the second cylinder control module;

After the i-th cylinder control module receives the crankshaft angle and crankshaft speed of the first cylinder sent by the i-1th cylinder control module, it calculates the i-th cylinder crankshaft angle corresponding to the i-th cylinder according to the crankshaft angle and crankshaft speed of the first cylinder; i is An integer greater than 1 and less than n;

Each cylinder control module performs fuel injection control on the cylinder corresponding to the cylinder control module according to the fuel injection angle parameter, the crankshaft speed and the crankshaft angle of the cylinder corresponding to the cylinder control module.

Further, the low-speed engine fuel injection control method also includes:

The first cylinder control module sends the first cylinder crankshaft angle and crankshaft speed to the overall machine control module;

The whole machine control module sends the first cylinder crankshaft angle and crankshaft speed to the first cylinder control module;

After receiving the first cylinder crankshaft angle and crankshaft speed sent by the whole machine control module, the first cylinder control module sends the first cylinder crankshaft angle and crankshaft speed to the second cylinder control module;

The control module of the i cylinder sends the crankshaft angle of the first cylinder, the crankshaft angle of the second cylinder ... the crankshaft angle of the i-1 cylinder, the crankshaft angle of the i cylinder and the crankshaft speed to the i+1 cylinder control module; i is greater than 1, and an integer less than n;

The nth cylinder control module sends the crankshaft angle and crankshaft speed of each cylinder to the overall machine control module.

The embodiment of the present invention solves the problem of synchronous fuel injection and drive control of the low-speed engine through the connection of the angle sensor, the speed sensor, the complete machine control module, n cylinders and the n cylinder control modules, and regularly collects the measurement data of the angle sensor and the speed sensor , which improves the real-time performance of each cylinder control. Each cylinder uses an independent cylinder control module. One cylinder control module controls the fuel injection of one cylinder, and the whole machine control module is responsible for the control of the whole machine, which can simplify the system wiring. Each cylinder control module uses the crankshaft angle and crankshaft speed of the first cylinder acquired by the first cylinder control module as calculation basis, so that each cylinder control module can accurately calculate its corresponding crankshaft angle, and better realize synchronous fuel injection , and can avoid the calculation error of the previous cylinder control module from affecting the calculation of the crankshaft angle of all subsequent cylinder control modules.

It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will be easily understood from the following description.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural view of a fuel injection control device for a low-speed engine provided by an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of another low-speed engine fuel injection control device provided by an embodiment of the present invention;

Fig. 3 is a partial structural schematic diagram of a fuel injection control device for a low-speed engine provided by an embodiment of the present invention;

Fig. 4 is a partial structural schematic diagram of another low-speed engine fuel injection control device provided by an embodiment of the present invention;

Fig. 5 is a schematic flowchart of a low-speed engine fuel injection control method provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

A fuel injection control device for a low-speed engine provided by the implementation of the present invention. Figure 1 is a schematic structural diagram of a fuel injection control device for a low-speed engine provided by an embodiment of the present invention. Referring to Figure 1, the fuel injection control device for a low-speed engine includes:

An angle sensor 7, a speed sensor 8, a complete machine control module 1 and n cylinder control modules; the n cylinder control modules correspond to the n cylinders of the low-speed engine; wherein, n is a positive integer greater than or equal to 2;

The n cylinders include the first cylinder 9, the angle sensor 7 is used to measure the first cylinder crankshaft angle of the first cylinder 9, and the rotational speed sensor 8 is used to measure the crankshaft speed of the first cylinder 9; the first cylinder 9 and the n cylinder control modules Corresponding to the first cylinder control module 2 in

The whole machine control module 1 is used to receive the fuel injection angle parameter configured by the user, and send the fuel injection angle parameter to each cylinder control module;

The first cylinder control module 2 is used to obtain the crankshaft angle of the first cylinder measured by the angle sensor 7 and the crankshaft speed measured by the speed sensor 8, and send the crankshaft angle and the crankshaft speed of the first cylinder to the second cylinder control module 3 ;

The i-th cylinder control module 5 is used to calculate the i-th cylinder crankshaft of the i-th cylinder 12 according to the crankshaft angle and crankshaft speed of the first cylinder after receiving the first cylinder crankshaft angle and crankshaft speed sent by the i-1th cylinder control module 4 Angle; i is an integer greater than 1 and less than n;

Each cylinder control module is used to control the fuel injection of the cylinder corresponding to the cylinder control module according to the fuel injection angle parameter, the crankshaft speed and the crankshaft angle of the cylinder corresponding to the cylinder control module.

Wherein, the angle sensor 7 may be a wire-wound angle sensor, a synthetic film angle sensor, a glass glaze angle sensor, etc., which is not limited in the embodiment of the present invention. The rotational speed sensor 8 may be a magnetoelectric rotational speed sensor, a capacitive rotational speed sensor, a variable reluctance rotational speed sensor, etc., which is not limited in this embodiment of the present invention. Exemplarily, the angle sensor 7 and the rotational speed sensor 8 may be installed on the crankshaft of the first cylinder 9 of the low-speed engine. The angle sensor 7 and the rotation speed sensor 8 can also be the same sensor, which measures the flywheel chainring, and the output is a Boolean signal after being processed by the circuit. In the embodiment of the present invention, the angle sensor 7 and the rotational speed sensor 8 are described as two sensors, and the first cylinder crankshaft angle of the first cylinder 9 measured by the angle sensor 7 and the crankshaft rotational speed of the first cylinder 9 measured by the rotational speed sensor 8 are transmitted to The first cylinder control module 2 monitors the crankshaft angle and crankshaft speed of the first cylinder in real time according to the actual situation. Exemplarily, the time interval for collecting the crankshaft angle and crankshaft speed of the first cylinder can be set to 0.2s.

The first cylinder control module 2 sends the acquired first cylinder crankshaft angle and crankshaft speed to the second cylinder control module 3, and the second cylinder control module 3 receives the first cylinder crankshaft angle and crankshaft speed sent by the first cylinder control module 2 After the rotating speed, calculate the crankshaft angle of the second cylinder; the second cylinder control module 3 sends the first cylinder crankshaft angle and the crankshaft speed to the third cylinder control module, and the third cylinder control module receives the second cylinder control module 3 sent After the crankshaft angle and crankshaft speed of the first cylinder, the crankshaft angle of the third cylinder is calculated; by analogy, the crankshaft angle and crankshaft speed of the first cylinder are sent to the n-1th cylinder control module after passing the n-2th cylinder control module, The n-1th cylinder control module calculates the n-1th cylinder crankshaft angle after receiving the first cylinder crankshaft angle and crankshaft speed to be obtained by the n-2th cylinder control module; finally, the n-1th cylinder control module will The crankshaft angle and crankshaft speed of the first cylinder are sent to the nth cylinder control module 6, and the nth cylinder control module 6 calculates the nth cylinder crankshaft angle according to the first cylinder crankshaft angle and crankshaft speed sent by the n-1th cylinder control module. Wherein, the crankshaft angle can be calculated according to the crankshaft angle of the first cylinder, the crankshaft speed combined with the time when the crankshaft angle of the first cylinder is transmitted to the module, and the offset angle of the cylinder, and the size of n is determined according to the specific number of cylinders in the low-speed engine.

Specifically, since the crankshaft angles of the cylinders are different, the crankshaft angle of each cylinder is determined according to the crankshaft angle and offset angle of the first cylinder 9 when the rotation angles are synchronized. Exemplarily, the method for determining the crankshaft angle is described in detail by taking a 6-cylinder engine as an example:

Set the firing order of the 6-cylinder engine to 1, 6, 2, 4, 3, 5 when the engine rotates forward. Since the crankshaft angle signal of the first cylinder comes from the first cylinder 9, the offset of the first cylinder to the sixth cylinder when it rotates forward The angles are 0°, 240°, 120°, 180°, 60°, and 300°, and the offset angles during inversion are 0°, 120°, 240°, 180°, 300°, and 60°. The crankshaft angle of each cylinder is obtained by adding the offset value to the crankshaft angle of the first cylinder of the first cylinder and taking the remainder of 360.

The whole machine control module 1 sends the fuel injection angle parameters configured by the user to each cylinder control module, wherein the fuel injection angle parameters may include fuel injection start angle, fuel injection end angle, fuel injection duration and so on. Each cylinder control module performs fuel injection control on the cylinder corresponding to the cylinder control module according to the fuel injection angle parameter, the crankshaft speed and the crankshaft angle of the cylinder corresponding to the cylinder control module. Exemplarily, taking the first cylinder 9 as an example, the control injection The specific method of oil is described in detail, and the specific description is as follows:

Assuming that the fuel injection angle range of the first cylinder 9 is [0°, 10°], then when the crankshaft angle of the first cylinder is 0°, the first cylinder control module 2 sends a driving enable signal to the first cylinder 9 to control the engine For fuel injection, when the crankshaft angle of the first cylinder is 10°, the first cylinder control module 2 sends a drive stop signal to the first cylinder 9 to control the engine to stop fuel injection.

The embodiment of the present invention solves the problem of synchronous fuel injection and drive control of low-speed engines by connecting the angle sensor 7, the rotational speed sensor 8, the complete machine control module 1, n cylinders and n cylinder control modules, and regularly collects the angle sensor 7 and the rotational speed The measurement data of the sensor 8 improves the real-time performance of each cylinder control. Each cylinder uses an independent cylinder control module. One cylinder control module controls the fuel injection of one cylinder, and the whole machine control module is responsible for the control of the whole machine, which can simplify the system wiring. Each cylinder control module uses the first cylinder crankshaft angle and crankshaft speed acquired by the first cylinder control module 2 as calculation basis, so that each cylinder control module can accurately calculate its corresponding crankshaft angle, and better realize synchronous injection. Oil, and can avoid the calculation error of the previous cylinder control module, which affects the calculation of the crankshaft angle of all subsequent cylinder control modules.

Fig. 2 is a schematic structural diagram of another low-speed engine fuel injection control device provided by an embodiment of the present invention. Optionally, referring to Fig. 2, the first cylinder control module 2 is also used to send the first cylinder crankshaft angle and crankshaft speed to Machine control module 1;

The whole machine control module 1 is used to send the first cylinder crankshaft angle and crankshaft speed to the first cylinder control module 2;

The first cylinder control module 2 is used to send the first cylinder crankshaft angle and crankshaft speed to the second cylinder control module 3 after receiving the first cylinder crankshaft angle and crankshaft speed sent by the complete machine control module 1;

The i-th cylinder control module 5 is also used to send the crankshaft angle of the first cylinder, the crankshaft angle of the second cylinder ... the i-1th cylinder crankshaft angle, the i-th cylinder crankshaft angle and the crankshaft speed to the i+1th cylinder control module; i is an integer greater than 1 and less than n;

The nth cylinder control module 6 is used to send the crankshaft angle and crankshaft speed of each cylinder to the complete machine control module 1 .

Exemplarily, the first cylinder control module 2 sends the first cylinder crankshaft angle and crankshaft speed to the overall machine control module 1, and the first cylinder crankshaft angle and crankshaft speed are stored in the overall machine control module together with the user-configured fuel injection angle parameters In the data frame of the independent storage unit of 1, the whole machine control module 1 sends the data frame including the crankshaft angle of the first cylinder, the crankshaft speed and the fuel injection angle parameter configured by the user to the first cylinder control module 2, and the first cylinder control module 2 Send the data frame sent by the complete machine control module 1, including the crankshaft angle and crankshaft speed of the first cylinder, the fuel injection angle parameters configured by the user, and the crankshaft angle and crankshaft speed of the first cylinder collected directly from the angle sensor 7 and the speed sensor 8 To the second cylinder control module 3, the second cylinder control module 3 receives the first cylinder crankshaft angle, crankshaft speed and user-configured fuel injection angle parameters sent by the whole machine control module 1, and directly from the angle sensor 7 and the speed After the data frame of the crankshaft angle and crankshaft speed of the first cylinder collected by the sensor 8, the crankshaft angle of the second cylinder is calculated and stored in the data frame. The crankshaft angle and crankshaft speed transmitted by module 2 and the data frame of the fuel injection angle parameter configured by the user are sent to the whole machine control module 1, and so on. After the data frame of the crankshaft angle, crankshaft speed and user-configured fuel injection angle parameters transmitted by the first cylinder control module 2 to the n-1th cylinder control module, it will contain the crankshaft angle of the nth cylinder and the complete machine control module 1 and the first The data frame of the crankshaft angle and crankshaft speed transmitted by the cylinder control module 2 to the n-1th cylinder control module and the fuel injection angle parameter configured by the user is sent to the whole machine control module 1, and will contain the crankshaft angle of the nth cylinder and the whole machine control The crankshaft angle and crankshaft speed transmitted by module 1 and the first cylinder control module 2 to the n-1th cylinder control module and the data frames of the fuel injection angle parameters configured by the user are stored in the independent storage unit. At this time, a cycle is completed and all The data is sent to the whole machine control module 1 in an orderly manner, which can ensure the data integrity of each cylinder, and facilitate the query of the crankshaft angle, crankshaft speed and fuel injection angle parameters of each cylinder after the engine finishes fuel injection.

At regular intervals, the angle sensor 7 and the rotation speed sensor 8 will collect the crankshaft angle and crankshaft speed of the first cylinder in real time, and the data in the independent storage unit of the complete machine control module 1 will also be updated in real time. At this time, the next cycle begins. Example Specifically, the interval time can be 2s.

Fig. 3 is a partial structural schematic diagram of a low-speed engine fuel injection control device provided by an embodiment of the present invention. Optionally, referring to Fig. 2 and Fig. 3, the cylinder control module includes an angle simulation unit and an angle drive unit;

The angle simulation unit of the i-th cylinder control module 5 is used to determine the time difference between the time when the i-th cylinder control module 5 receives the crankshaft angle of the first cylinder and the time when the angle sensor 7 measures the crankshaft angle of the first cylinder. The crankshaft angle of the cylinder 9, and according to the crankshaft angle of the first cylinder 9 at the current moment, and the crankshaft offset angle between the i cylinder 12 and the first cylinder 9, determine the ith cylinder crankshaft angle of the i cylinder 12;

The angle drive unit of the i-th cylinder control module 5 is used to perform fuel injection control on the i-th cylinder according to the crankshaft angle, crankshaft speed and fuel injection angle parameters of the i-th cylinder.

Specifically, each cylinder control module includes an angle simulation unit and an angle drive unit, and the crankshaft may rotate to the set injection speed between the data collected by the angle sensor 7 and the rotational speed sensor 8 and the network communication between each cylinder and the complete machine control module 1. Oil angle, so the angle simulation unit needs to extrapolate the current angle according to the crankshaft speed and the crankshaft angle of the first cylinder during the data update interval, the angle simulation unit sends the processed crankshaft angle to the angle drive unit, and the angle drive unit passes the angle simulation unit The processed crankshaft angle, crankshaft speed and fuel injection angle parameters are used for fuel injection control to make the fuel injection control more precise. As an example, take the second cylinder control module 3 as an example to illustrate the working principle of the angle simulation unit and the angle drive unit , refer to Figure 3:

Wherein, the second cylinder control module 3 includes a second angle simulation unit 14 and a second angle drive unit 15, and the transmission time between each module is set as time t, because the data needs to be passed to the whole system by the first cylinder control module 2. Machine control module 1, and then from the whole machine control module 1 to the first cylinder control module 2, and finally from the first cylinder control module 2 to the second cylinder control module 3, after three times t in between. The time difference between the second cylinder control module 3 receiving the first cylinder crank angle and the first cylinder control module 2 collecting the first cylinder crank angle is t1=3t. Multiply the time difference t1 by the crankshaft speed to get the crankshaft angle α that needs to be corrected for the second cylinder 10, and add the crankshaft angle α that needs to be corrected for the second cylinder 10 to the crankshaft angle α that needs to be corrected for the second cylinder 9 to get the crankshaft angle of the first cylinder 9 at the current moment , the crankshaft angle of the first cylinder 9 at the current moment is added to the offset angle of the second cylinder 10 to obtain the second cylinder crankshaft angle of the second cylinder 10 .

When the second cylinder control module 3 writes the crankshaft speed and the crankshaft angle information of the first cylinder into the second angle simulation unit 14, when the crankshaft speed is written into the second angle simulation unit 14, when the speed sensor measures the chainring, it will generate A square wave signal, the square wave signal is the edge signal, which is converted into the period of the edge signal through the number of teeth of the flywheel of the engine. Exemplarily, taking the number of teeth of the flywheel of the engine as 120 teeth as an example, the period of the edge signal is the time corresponding to 360°/120=3°. The second angle simulation unit 14 can also subdivide the edge signal cycle. Exemplarily, divide the time of the edge signal cycle 3° by 256 to obtain the subdivided time, and use the subdivided time to change the simulation angle. The angular resolution is improved, which in turn enables higher precision angular actuation.

Optionally, the fuel injection angle parameter includes a fuel injection start angle and a fuel injection end angle, or, the fuel injection angle parameter includes a fuel injection start angle and a fuel injection duration.

Specifically, when using the fuel injection start angle + fuel injection close angle as the fuel injection angle parameters used together, the fuel injection starts when the current crankshaft rotation angle is within the interval between the fuel injection start angle and the fuel injection close angle, and the crankshaft rotation angle is between the injection Stop fuel injection when the oil start angle and fuel injection close angle are outside the range; when using fuel injection start angle + fuel injection duration as the fuel injection angle parameter used in conjunction, then start fuel injection when the current crankshaft rotation angle reaches the fuel injection start angle , stop the fuel injection after the fuel injection duration.

FIG. 4 is a partial structural schematic diagram of another low-speed engine fuel injection control device provided by an embodiment of the present invention. Optionally, referring to FIG. 4 , the cylinder control module includes an FPGA 16 .

Specifically, the FPGA is a processing chip independent of the CPU of the cylinder control module, and the fuel injection control can be implemented using the FPGA. Exemplary, take the second cylinder control module 3 as an example for illustration, the FPGA includes a second angle simulation unit 14 and a second angle drive unit 15, and the cylinder control module uses a processing chip to control the fuel injection while collecting data , the fuel injection control is easily interrupted by the real-time acquisition of the crankshaft angle and crankshaft speed of the first cylinder. Embedding FPGA in the cylinder control module can make the fuel injection control more precise and can be executed in parallel with other control functions.

Optionally, referring to FIG. 2 , communication between the overall machine control module 1 and the cylinder control module, and between each cylinder control module is via the EtherCAT protocol.

Specifically, the EtherCAT protocol has high real-time performance, and can transmit the information of the complete machine control module 1 to each cylinder control module at the first time. At the same time, the EtherCAT protocol has certain fault judgment and fault recovery capabilities. If there is a problem with a certain cylinder control module, the EtherCAT protocol will form a connection between the whole machine control module 1 and the previous cylinder control module of the faulty cylinder control module. At the same time, a network will be formed between the whole machine control module 1 and the cylinder control module after a certain cylinder control module that fails, without affecting the normal operation of other cylinder control modules.

Optionally, the whole machine control module is used to receive user-configured fuel injection angle parameters through the CAN protocol.

Specifically, the CANOpen protocol is used to send the fuel injection angle parameters configured by the user to the control module of the whole machine. The sending process is relatively simple to implement and the technology is relatively mature.

An embodiment of the present invention also provides a low-speed engine, which includes the fuel injection control device for a low-speed engine provided in the above-mentioned embodiments.

The embodiment of the present invention solves the problem of synchronous fuel injection and drive control of the low-speed engine through the connection of the angle sensor, the speed sensor, the complete machine control module, n cylinders and the n cylinder control modules, and regularly collects the measurement data of the angle sensor and the speed sensor , which improves the real-time performance of each cylinder control. Each cylinder uses an independent cylinder control module. One cylinder control module controls the fuel injection of one cylinder, and the whole machine control module is responsible for the control of the whole machine, which can simplify the system wiring. Each cylinder control module uses the crankshaft angle and crankshaft speed of the first cylinder acquired by the first cylinder control module as calculation basis, so that each cylinder control module can accurately calculate its corresponding crankshaft angle, and better realize synchronous fuel injection , and can avoid the calculation error of the previous cylinder control module from affecting the calculation of the crankshaft angle of all subsequent cylinder control modules.

Fig. 5 is a schematic flowchart of a low-speed engine fuel injection control method provided by an embodiment of the present invention. The embodiment of the present invention is implemented through a low-speed engine fuel injection control device and a low-speed engine. Since the low-speed engine fuel injection control device includes an angle sensor , a rotational speed sensor, a complete machine control module and n cylinder control modules; the n cylinder control modules are in one-to-one correspondence with the n cylinders of the low-speed engine; wherein, n is a positive integer greater than or equal to 2; the n cylinders It includes a first cylinder, the angle sensor is used to measure the crankshaft angle of the first cylinder of the first cylinder, and the rotational speed sensor is used to measure the crankshaft rotational speed of the first cylinder; the first cylinder is connected with n said Corresponding to the first cylinder control module in the cylinder control module, as shown in Figure 5, the low-speed engine fuel injection control method specifically includes the following steps:

S101. The complete machine control module receives the fuel injection angle parameter configured by the user, and sends the fuel injection angle parameter to each cylinder control module;

S102. The first cylinder control module obtains the crankshaft angle of the first cylinder measured by the angle sensor and the crankshaft speed measured by the speed sensor, and sends the crankshaft angle and the crankshaft speed of the first cylinder to the second cylinder control module;

S103. After the i-th cylinder control module receives the first cylinder crankshaft angle and crankshaft speed sent by the i-1th cylinder control module, calculate the i-th cylinder crankshaft angle corresponding to the i-th cylinder according to the crankshaft angle and crankshaft speed of the first cylinder; i is an integer greater than 1 and less than n;

S104. Each cylinder control module performs fuel injection control on the cylinder corresponding to the cylinder control module according to the fuel injection angle parameter, the crankshaft speed, and the crankshaft angle of the cylinder corresponding to the cylinder control module.

Optionally, the first cylinder control module sends the first cylinder crankshaft angle and crankshaft speed to the overall machine control module;

The whole machine control module sends the first cylinder crankshaft angle and crankshaft speed to the first cylinder control module;

After receiving the first cylinder crankshaft angle and crankshaft speed sent by the whole machine control module, the first cylinder control module sends the first cylinder crankshaft angle and crankshaft speed to the second cylinder control module;

The control module of the i cylinder sends the crankshaft angle of the first cylinder, the crankshaft angle of the second cylinder ... the crankshaft angle of the i-1 cylinder, the crankshaft angle of the i cylinder and the crankshaft speed to the i+1 cylinder control module; i is greater than 1, and an integer less than n;

The nth cylinder control module sends the crankshaft angle and crankshaft speed of each cylinder to the overall machine control module.

The embodiment of the present invention solves the problem of synchronous fuel injection and drive control of the low-speed engine through the connection of the angle sensor, the speed sensor, the complete machine control module, n cylinders and the n cylinder control modules, and regularly collects the measurement data of the angle sensor and the speed sensor , which improves the real-time performance of each cylinder control. Each cylinder uses an independent cylinder control module. One cylinder control module controls the fuel injection of one cylinder, and the whole machine control module is responsible for the control of the whole machine, which can simplify the system wiring. Each cylinder control module uses the crankshaft angle and crankshaft speed of the first cylinder acquired by the first cylinder control module as calculation basis, so that each cylinder control module can accurately calculate its corresponding crankshaft angle, and better realize synchronous fuel injection , and can avoid the calculation error of the previous cylinder control module from affecting the calculation of the crankshaft angle of all subsequent cylinder control modules.

It should be understood that steps may be reordered, added or deleted using the various forms of flow shown above. For example, each step described in the present invention may be executed in parallel, sequentially, or in a different order, as long as the desired result of the technical solution of the present invention can be achieved, there is no limitation herein.

The above specific implementation methods do not constitute a limitation to the protection scope of the present invention. It should be apparent to those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A fuel injection control device for a low-speed engine, characterized in that it comprises: An angle sensor, a speed sensor, a complete machine control module, and n cylinder control modules; the n cylinder control modules correspond to the n cylinders of the low-speed engine; wherein, n is a positive integer greater than or equal to 2; The n cylinders include a first cylinder, the angle sensor is used to measure the crankshaft angle of the first cylinder of the first cylinder, and the rotation speed sensor is used to measure the crankshaft speed of the first cylinder; the first cylinder Corresponding to the first cylinder control module among the n cylinder control modules; The whole machine control module is used to receive the fuel injection angle parameter configured by the user, and send the fuel injection angle parameter to each of the cylinder control modules; The first cylinder control module is used to acquire the crankshaft angle of the first cylinder measured by the angle sensor and the crankshaft speed measured by the rotational speed sensor, and calculate the crankshaft angle of the first cylinder and the crankshaft angle of the first cylinder Send the crankshaft speed to the second cylinder control module; The i-th cylinder control module is used to calculate the i-th cylinder crankshaft angle of the i-th cylinder according to the first cylinder crankshaft angle and crankshaft speed after receiving the first cylinder crankshaft angle and crankshaft speed sent by the i-1th cylinder control module; i is an integer greater than 1 and less than n; Each of the cylinder control modules is used to control the fuel injection of the cylinder corresponding to the cylinder control module according to the fuel injection angle parameter, the crankshaft speed and the crankshaft angle of the cylinder corresponding to the cylinder control module. 2. The device according to claim 1, characterized in that, The first cylinder control module is also used to send the first cylinder crankshaft angle and the crankshaft speed to the overall machine control module; The whole machine control module is used to send the first cylinder crankshaft angle and the crankshaft speed to the first cylinder control module; The first cylinder control module is configured to send the crankshaft angle of the first cylinder and the crankshaft speed to the first cylinder after receiving the first cylinder crankshaft angle and the crankshaft speed sent by the overall machine control module. Two-cylinder control module; The i-th cylinder control module is also used to send the crankshaft angle of the first cylinder, the crankshaft angle of the second cylinder...the i-1th cylinder crankshaft angle, the i-th cylinder crankshaft angle and the crankshaft speed to the i+1th cylinder control module; i is an integer greater than 1 and less than n; The nth cylinder control module is used to send the crankshaft angle and the crankshaft speed of each cylinder to the overall machine control module. 3. The device according to claim 1 or 2, characterized in that, The cylinder control module includes an angle simulation unit and an angle drive unit; The angle simulation unit of the i-th cylinder control module is used to determine the time difference between the time when the i-th cylinder control module receives the crankshaft angle of the first cylinder and the time when the angle sensor measures the crankshaft angle of the first cylinder, according to the The time difference and the crankshaft speed determine the crankshaft angle of the first cylinder at the current moment, and determine the i-th cylinder crankshaft angle; The angle drive unit of the i-th cylinder control module is used to perform fuel injection control on the i-th cylinder according to the i-th cylinder crankshaft angle, crankshaft speed and the fuel injection angle parameter. 4. The device of claim 3, wherein: The fuel injection angle parameter includes a fuel injection start angle and a fuel injection end angle, or, the fuel injection angle parameter includes a fuel injection start angle and a fuel injection duration. 5. The device of claim 1, wherein: The cylinder control module includes FPGA. 6. The device of claim 1, wherein: The communication between the complete machine control module and the cylinder control module, as well as between the cylinder control modules, is via the EtherCAT protocol. 7. The device of claim 1, wherein: The whole machine control module is used to receive the fuel injection angle parameter configured by the user through the CAN protocol. 8. A low-speed engine, characterized in that it comprises the low-speed engine fuel injection control device according to any one of claims 1-7. 9. A low-speed engine fuel injection control method is characterized in that the low-speed engine fuel injection control device includes an angle sensor, a rotational speed sensor, a complete machine control module and n cylinder control modules; n said cylinder control modules are connected with the low-speed engine The n cylinders correspond one to one; wherein, n is a positive integer greater than or equal to 2; the n cylinders include the first cylinder, and the angle sensor is used to measure the crankshaft angle of the first cylinder of the first cylinder. The rotational speed sensor is used to measure the crankshaft rotational speed of the first cylinder; the first cylinder corresponds to the first cylinder control module among the n cylinder control modules; Low speed engine fuel injection control methods include: The complete machine control module receives the fuel injection angle parameter configured by the user, and sends the fuel injection angle parameter to each of the cylinder control modules; The first cylinder control module acquires the crankshaft angle of the first cylinder measured by the angle sensor and the crankshaft speed measured by the rotational speed sensor, and calculates the crankshaft angle of the first cylinder and the crankshaft The rotational speed is sent to the second cylinder control module; After the i-th cylinder control module receives the crankshaft angle and crankshaft speed of the first cylinder sent by the i-1th cylinder control module, it calculates the i-th cylinder crankshaft angle corresponding to the i-th cylinder according to the crankshaft angle and crankshaft speed of the first cylinder; i is An integer greater than 1 and less than n; Each of the cylinder control modules performs fuel injection control on the cylinder corresponding to the cylinder control module according to the fuel injection angle parameter, the crankshaft speed and the crank angle of the cylinder corresponding to the cylinder control module. 10. The method of claim 9, further comprising: The first cylinder control module sends the first cylinder crankshaft angle and the crankshaft speed to the overall machine control module; The whole machine control module sends the first cylinder crankshaft angle and the crankshaft speed to the first cylinder control module; The first cylinder control module sends the first cylinder crank angle and the crankshaft speed to the second cylinder after receiving the first cylinder crankshaft angle and the crankshaft speed sent by the overall machine control module control module; The control module of the i cylinder sends the crankshaft angle of the first cylinder, the crankshaft angle of the second cylinder ... the crankshaft angle of the i-1 cylinder, the crankshaft angle of the i cylinder and the crankshaft speed to the i+1 cylinder control module; i is greater than 1, and an integer less than n; The nth cylinder control module sends the crankshaft angle and the crankshaft speed of each cylinder to the overall machine control module.

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