CN114673601B - Rapid pressure building method, device and equipment for starting diesel engine and readable storage medium - Google Patents

Rapid pressure building method, device and equipment for starting diesel engine and readable storage medium Download PDF

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Publication number
CN114673601B
CN114673601B CN202210271812.4A CN202210271812A CN114673601B CN 114673601 B CN114673601 B CN 114673601B CN 202210271812 A CN202210271812 A CN 202210271812A CN 114673601 B CN114673601 B CN 114673601B
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pressure
diesel engine
electromagnetic valve
pressure oil
reserved cavity
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CN114673601A (en
Inventor
张明
张衡
刘振华
周杰敏
陈玉俊
徐丹
龙祥
覃思绮
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention provides a quick pressure buildup method, a device and equipment for starting a diesel engine and a readable storage medium, wherein the quick pressure buildup method for starting the diesel engine comprises the following steps: the method comprises the steps that a high-pressure reserved cavity is additionally arranged on a base structure of an original high-pressure common rail system, when a diesel engine is started, an outlet electromagnetic valve is opened, the opening times of the outlet electromagnetic valve is increased by one, and a high-pressure oil rail is pressurized through the high-pressure reserved cavity; and when the pressure value in the high-pressure oil rail is detected to reach a first preset pressure value, closing the outlet electromagnetic valve. The high-pressure oil stored in the high-pressure reserved cavity is used for improving the pressure building pressure of the high-pressure oil rail when the diesel engine is started, and the pressure building time of the high-pressure oil rail is shortened, so that the problem that the diesel engine is difficult to start is solved.

Description

Rapid pressure building method, device and equipment for starting diesel engine and readable storage medium
Technical Field
The invention relates to the field of vehicle fuel systems, in particular to a method, a device and equipment for quickly building pressure during starting of a diesel engine and a readable storage medium.
Background
The existing diesel engine adopts a high-pressure common rail system, when the diesel engine needs to be started, a starter drives the diesel engine to rotate firstly, high-pressure oil in a high-pressure oil pump is injected into a high-pressure oil rail of the high-pressure common rail system of the diesel engine, so that the pressure of the high-pressure oil rail is increased to the oil pressure required by the starting of the diesel engine, the process is a pressure building process for the starting of a fuel system of the diesel engine, and the diesel engine can spray only when the pressure in the high-pressure oil rail meets the oil pressure required by the starting of the diesel engine, so that the starting of the fuel system of the diesel engine is realized. In the existing pressure building process, because the high-pressure oil pump is mechanically linked with the crankshaft of the diesel engine, the crankshaft of the diesel engine runs for a circle, the high-pressure oil pump can inject the high-pressure oil compressed by the high-pressure oil pump into the high-pressure oil rail and shows pulse fluctuation, and the rotating speed of the diesel engine is required to reach a sufficient size when the high-pressure oil rail rises from low pressure to high pressure. Wherein, receive the influence that the starting speed is low, rail pressure build pressure time generally can be longer, and is low because of the temperature is low in special environment such as severe cold district, and fuel flow nature is lower, according to above normal starting mode, will cause to build pressure time longer, the start difficulty appears easily.
Disclosure of Invention
The invention mainly aims to provide a method, a device and equipment for quickly building pressure for starting a diesel engine and a readable storage medium, and aims to solve the technical problem that in the prior art, the rail pressure building time is too long due to low starting rotating speed when the diesel engine is just started, so that starting difficulty is easy to occur.
In a first aspect, the present invention provides a method for quickly building pressure for starting a diesel engine, where the method for quickly building pressure for starting a diesel engine includes the following steps:
when the diesel engine is started, opening an outlet electromagnetic valve, adding one to the opening times of the outlet electromagnetic valve, and pressurizing the high-pressure oil rail through a high-pressure reserved cavity, wherein the outlet electromagnetic valve is connected with the high-pressure reserved cavity and the high-pressure oil rail oil outlet pipe through a high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by a high-pressure oil pump;
and when the pressure value in the high-pressure oil rail is detected to reach a first preset pressure value, closing the outlet electromagnetic valve.
Optionally, when the diesel engine is started, the step of opening the outlet solenoid valve includes:
when the diesel engine runs, detecting whether a change value of the rotating speed of the diesel engine in a first preset time period is smaller than a first preset threshold value, whether a change value of the torque of the diesel engine is smaller than a second preset threshold value, and whether a pressure change value of a high-pressure oil rail in the diesel engine is smaller than a third preset threshold value;
when the pressure of the high-pressure oil rail is detected to reach a second preset pressure value, the variation value of the rotating speed of the diesel engine in the first preset time is smaller than a first preset threshold value, the variation value of the torque of the diesel engine is smaller than the second preset threshold value, and the variation value of the pressure of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value, an inlet electromagnetic valve is opened to inject high-pressure oil in a high-pressure oil pump into a high-pressure reserved cavity, and the inlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil inlet pipe through a high-pressure reserved cavity oil inlet pipe and is used for controlling the high-pressure oil pump to inject the high-pressure oil into the high-pressure reserved cavity;
determining a second preset time length according to the opening times of the outlet electromagnetic valve;
and when the opening time of the inlet electromagnetic valve reaches a second preset time, closing the inlet electromagnetic valve and resetting the opening times of the outlet electromagnetic valve.
Optionally, the step of opening the inlet solenoid valve is followed by:
detecting whether the pressure in the high-pressure oil rail is reduced;
and if the pressure in the high-pressure oil rail is detected to be reduced, closing the inlet electromagnetic valve, and updating the opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve.
Optionally, the step of updating the opening times of the outlet solenoid valve according to the opening duration of the inlet solenoid valve includes:
determining the increased opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time;
and updating the opening times of the outlet solenoid valve based on the increased opening times of the outlet solenoid valve.
Optionally, the step of determining the second preset time period according to the opening times of the outlet solenoid valve includes:
determining the range of the pressure value of the residual oil pressure in the high-pressure reserved cavity according to the opening times of the outlet electromagnetic valve;
and determining a second preset time length according to the pressure value range of the residual oil pressure in the high-pressure reserved cavity, the target pressure value of the high-pressure reserved cavity and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time.
In a second aspect, the present invention further provides a quick pressure buildup device for starting a diesel engine, including:
the system comprises an outlet electromagnetic valve opening module, a high-pressure oil rail pressure boosting module and a high-pressure oil rail pressure boosting module, wherein the outlet electromagnetic valve opening module is used for opening an outlet electromagnetic valve when the diesel engine is started, adding one to the opening times of the outlet electromagnetic valve, and boosting the high-pressure oil rail through a high-pressure reserved cavity, the outlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil outlet pipe through a high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by a high-pressure oil pump;
and the outlet electromagnetic valve closing module is used for closing the outlet electromagnetic valve when detecting that the pressure value in the high-pressure oil rail reaches a first preset pressure value.
Optionally, the quick pressure buildup device that diesel engine starts still includes the inlet solenoid valve control template for:
when the diesel engine runs, detecting whether a change value of the rotating speed of the diesel engine in a first preset time period is smaller than a first preset threshold value, whether a change value of the torque of the diesel engine is smaller than a second preset threshold value and whether a pressure change value of a high-pressure oil rail in the diesel engine is smaller than a third preset threshold value;
when the pressure of the high-pressure oil rail is detected to reach a second preset pressure value, the variation value of the rotating speed of the diesel engine in the first preset time is smaller than a first preset threshold value, the variation value of the torque of the diesel engine is smaller than the second preset threshold value, and the variation value of the pressure of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value, an inlet electromagnetic valve is opened to inject high-pressure oil in a high-pressure oil pump into a high-pressure reserved cavity, and the inlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil inlet pipe through a high-pressure reserved cavity oil inlet pipe and is used for controlling the high-pressure oil pump to inject the high-pressure oil into the high-pressure reserved cavity;
determining a second preset time length according to the opening times of the outlet electromagnetic valve;
and when the opening time of the inlet electromagnetic valve reaches a second preset time, closing the inlet electromagnetic valve and resetting the opening times of the outlet electromagnetic valve.
Optionally, the inlet solenoid valve control template is further configured to:
detecting whether the pressure in the high-pressure oil rail is reduced;
and if the pressure in the high-pressure oil rail is detected to be reduced, closing the inlet electromagnetic valve, and updating the opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve.
Optionally, the inlet solenoid valve control template is further configured to:
determining the increased opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time;
and updating the opening times of the outlet solenoid valve based on the increased opening times of the outlet solenoid valve.
Optionally, the inlet solenoid valve control template is further configured to:
determining the range of the pressure value of the residual oil pressure in the high-pressure reserved cavity according to the opening times of the outlet electromagnetic valve;
and determining a second preset time length according to the pressure value range of the residual oil pressure in the high-pressure reserved cavity, the target pressure value of the high-pressure reserved cavity and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time.
In a third aspect, the present invention further provides a diesel engine started rapid pressure building apparatus, where the diesel engine started rapid pressure building apparatus includes a processor, a memory, and a diesel engine started rapid pressure building program stored in the memory and executable by the processor, where the diesel engine started rapid pressure building program implements the steps of the diesel engine started rapid pressure building method as described above when executed by the processor.
In a fourth aspect, the present invention further provides a readable storage medium, wherein the readable storage medium stores a diesel engine started fast pressure buildup program, and when the diesel engine started fast pressure buildup program is executed by a processor, the steps of the diesel engine started fast pressure buildup method are implemented as described above.
According to the invention, a high-pressure reserved cavity is added on the basic structure of the original high-pressure common rail system, when a diesel engine is started, an outlet electromagnetic valve is opened, the opening times of the outlet electromagnetic valve is increased by one, and a high-pressure oil rail is pressurized through the high-pressure reserved cavity, wherein the outlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil outlet pipe through a high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by a high-pressure oil pump; and when the pressure value in the high-pressure oil rail is detected to reach a first preset pressure value, closing the outlet electromagnetic valve. The high-pressure oil stored in the high-pressure reserved cavity is used for improving the pressure building pressure of the high-pressure oil rail when the diesel engine is started, and the pressure building time of the high-pressure oil rail is shortened, so that the problem that the diesel engine is difficult to start is solved.
Drawings
Fig. 1 is a schematic diagram of a hardware structure of a rapid pressure building device for starting a diesel engine according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a rapid pressure buildup method for starting a diesel engine according to the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of a rapid pressure build-up method for starting a diesel engine according to the present invention;
fig. 4 is a functional module schematic diagram of an embodiment of the rapid pressure buildup device for starting a diesel engine according to the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a first aspect, an embodiment of the present invention provides a rapid pressure building device for starting a diesel engine.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a diesel engine started rapid pressure building device according to an embodiment of the present invention. In this embodiment of the present invention, the diesel engine started rapid voltage building device may include a processor 1001 (for example, a Central processing unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for implementing connection communication among the components; the user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WI-FI interface, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to fig. 1, the memory 1005 of fig. 1, which is one type of computer storage medium, may include an operating system, a network communication module, a user interface module, and a diesel-enabled fast voltage build-up program. The processor 1001 may call a diesel engine starting rapid voltage build-up program stored in the memory 1005, and execute the diesel engine starting rapid voltage build-up method provided by the embodiment of the present invention.
In a second aspect, an embodiment of the present invention provides a method for quickly building a pressure for starting a diesel engine.
Referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of a rapid pressure buildup method for starting a diesel engine according to the present invention.
In an embodiment of the invention, the method for quickly building the pressure for starting the diesel engine comprises the following steps:
step S10, when a diesel engine is started, opening an outlet electromagnetic valve, adding one to the opening times of the outlet electromagnetic valve, and pressurizing a high-pressure oil rail through a high-pressure reserved cavity, wherein the outlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil outlet pipe through a high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by a high-pressure oil pump;
in this embodiment, the existing diesel engine adopts a high-pressure common rail system, which includes an EECU (diesel engine electronic control unit), an oil tank, a fuel filter, a high-pressure oil pump, a high-pressure oil rail, and an oil injector. The method comprises the steps that an EECU collects variable parameters including the rotating speed of a diesel engine, the torque demand of the diesel engine, the state of the diesel engine, the pressure of an oil rail and the like, diesel oil is stored in an oil tank, impurities and the like in the diesel oil are filtered through a fuel oil filter, the diesel oil is pumped into a high-pressure oil rail in a high-pressure common rail system through a high-pressure oil pump, an oil rail pressure sensor is installed on the high-pressure oil rail to monitor the pressure value of the high-pressure oil rail, when the pressure of the high-pressure oil rail is detected to reach a preset pressure value, an oil injector starts to inject, and the diesel engine finishes starting. However, in the starting process, the rotation speed of the diesel engine is low when the diesel engine is just started, so that the pressure building time of a high-pressure oil rail in a high-pressure common rail system is too long, and the diesel engine is difficult to start.
Therefore, referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a rapid pressure buildup method for starting a diesel engine according to the present invention, in which a pressure buildup supplementing structure is added to an original high-pressure common rail system of the diesel engine, and the pressure buildup supplementing structure includes an inlet solenoid valve, a high-pressure reserve chamber, and an outlet solenoid valve. The inlet electromagnetic valve is connected with the high-pressure reserved cavity and the high-pressure oil rail oil inlet pipe through a high-pressure reserved cavity oil inlet pipe and is used for controlling the high-pressure oil pump to inject high-pressure oil into the high-pressure reserved cavity; the high-pressure reserved cavity is used for storing high-pressure oil injected by the high-pressure oil pump; and the outlet electromagnetic valve is connected with the high-pressure reserved cavity and the high-pressure oil rail oil outlet pipe through the high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail.
When the diesel engine is started, high-pressure oil is stored in the high-pressure reserved cavity, and the pressure value in the high-pressure reserved cavity is higher than the pressure value required by the diesel engine for completing the starting, so that the outlet electromagnetic valve can be opened, and the high-pressure oil is injected into the high-pressure oil rail through the high-pressure reserved cavity while the high-pressure oil is injected into the high-pressure oil rail through the original high-pressure oil pump, so that the high-pressure oil rail can be pressurized. Meanwhile, the volume of the high-pressure reserved cavity is limited, so that the number of times of pressurizing the high-pressure oil rail is limited under the condition that the high-pressure reserved cavity is full. When the outlet electromagnetic valve is opened, the opening times of the outlet electromagnetic valve is increased by one, and whether the high-pressure oil in the high-pressure reserved cavity can be injected into the high-pressure oil rail or not is judged according to the opening times of the outlet electromagnetic valve recorded every time, so that the pressure of the high-pressure oil rail is built.
And step S20, when the pressure value in the high-pressure oil rail is detected to reach a first preset pressure value, closing the outlet electromagnetic valve.
In this embodiment, after opening the outlet solenoid valve, when detecting that the pressure value in the high pressure oil rail reaches the first preset pressure value, close the outlet solenoid valve. When the pressure value of the high-pressure oil rail reaches a first preset pressure value, the oil injector starts to inject, and the diesel engine finishes the starting process, namely the first preset pressure value is the pressure value which is required by the high-pressure oil rail to finish the starting of the diesel engine. When the diesel engine is just started, the high-pressure reserved cavity can be controlled to supply oil and pressurize the high-pressure oil rail by opening and closing the outlet electromagnetic valve, the pressure building pressure of the high-pressure oil rail can be improved when the diesel engine is started, the pressure building time of the high-pressure oil rail is shortened, and therefore the problem that the diesel engine is difficult to start is solved.
Further, in one embodiment, the step of opening the outlet solenoid valve when the diesel engine is started comprises the following steps:
when the diesel engine runs, detecting whether a change value of the rotating speed of the diesel engine in a first preset time period is smaller than a first preset threshold value, whether a change value of the torque of the diesel engine is smaller than a second preset threshold value, and whether a pressure change value of a high-pressure oil rail in the diesel engine is smaller than a third preset threshold value;
when the pressure of the high-pressure oil rail is detected to reach a second preset pressure value, the variation value of the rotating speed of the diesel engine in the first preset time is smaller than a first preset threshold value, the variation value of the torque of the diesel engine is smaller than the second preset threshold value, and the variation value of the pressure of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value, an inlet electromagnetic valve is opened to inject high-pressure oil in a high-pressure oil pump into a high-pressure reserved cavity, and the inlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil inlet pipe through a high-pressure reserved cavity oil inlet pipe and is used for controlling the high-pressure oil pump to inject the high-pressure oil into the high-pressure reserved cavity;
determining a second preset time length according to the opening times of the outlet electromagnetic valve;
and when the opening time of the inlet electromagnetic valve reaches a second preset time, closing the inlet electromagnetic valve and resetting the opening times of the outlet electromagnetic valve.
In this embodiment, the high pressure is reserved the chamber and is all can be given high-pressure oil rail oil feed pressure boost when the diesel engine starts at every turn, therefore the high-pressure oil of high pressure reservation chamber can reduce after the diesel engine starts to accomplish at every turn. In the normal operation process of the diesel engine, high-pressure oil can be injected into the high-pressure reserved cavity through the high-pressure oil pump, so that the pressure value of the high-pressure reserved cavity is increased, the opening times of the high-pressure reserved cavity are increased, and the high-pressure reserved cavity can still supply oil and pressurize to the high-pressure oil rail through the high-pressure reserved cavity in the next starting process. Therefore, when the diesel engine operates, whether the current operating state meets the opening condition of the inlet electromagnetic valve or not can be detected to determine whether the oil can be injected into the high-pressure reserved cavity or not, wherein the inlet electromagnetic valve can be opened only when the current operating state of the diesel engine is stable and the pressure of the high-pressure oil rail is stable in order to ensure the safety of the oil supply for the high-pressure reserved cavity.
Therefore, in the operation process of the diesel engine, whether the change value of the rotating speed of the diesel engine in a first preset time period is smaller than a first preset threshold value and whether the change value of the torque of the diesel engine is smaller than a second preset threshold value are required to be detected so as to determine that the current operation state of the diesel engine is stable; and whether the pressure change value of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value or not so as to determine that the pressure of the high-pressure oil rail is stable. The first preset threshold, the second preset threshold and the third preset threshold are all calibrated values. And when the pressure of the high-pressure oil rail is detected to reach a second preset pressure value, the change value of the rotating speed of the diesel engine in the first preset duration is smaller than a first preset threshold value, the change value of the torque of the diesel engine is smaller than a second preset threshold value, and the change value of the pressure of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value, opening an inlet electromagnetic valve to inject high-pressure oil in a high-pressure oil pump into the high-pressure reserved cavity to supplement the oil pressure of the high-pressure reserved cavity.
Meanwhile, after the inlet solenoid valve is opened, it is necessary to determine a time for supplementing the oil pressure in the high-pressure reserve chamber to a preset value by the high-pressure oil pump, that is, an opening time period of the inlet solenoid valve, based on a current condition of the high-pressure reserve chamber. The oil pressure reduced by each starting of the high-pressure reserve cavity is fixed, namely the pressure value range of the high-pressure reserve cavity corresponding to the opening times of the high-pressure reserve cavity is known. Therefore, the residual opening times of the high-pressure reserved cavity can be obtained through the recorded opening times of the outlet electromagnetic valve, the pressure value range of the high-pressure reserved cavity can be determined through the residual opening times, high-pressure oil needing to be supplemented is determined based on the pressure value range of the high-pressure reserved cavity, and therefore the second preset time for supplementing the pressure to the preset value of the high-pressure reserved cavity is determined. Therefore, after the second preset time period is determined according to the opening times of the outlet electromagnetic valve, when the opening time period of the inlet electromagnetic valve reaches the second preset time period, the inlet electromagnetic valve is closed, and the opening times of the outlet electromagnetic valve is cleared. The opened times of the outlet electromagnetic valve are zero, and the residual opened times are restored to the preset value.
Further, in one embodiment, the step of opening the inlet solenoid valve is followed by:
detecting whether the pressure in the high-pressure oil rail is reduced;
and if the pressure in the high-pressure oil rail is detected to be reduced, closing the inlet electromagnetic valve, and updating the opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve.
In this embodiment, since the pressure in the high-pressure oil rail is affected by the accelerator opening, when the accelerator opening is decreased, the pressure in the high-pressure oil rail is decreased accordingly. The high pressure oil rail is in unstable state and high pressure oil rail self pressure value does not satisfy the condition that is greater than the second preset pressure value this moment, consequently the fuel feeding process who reserves the chamber for the high pressure this moment has the risk. Therefore, after the inlet electromagnetic valve is opened, whether the pressure value in the high-pressure oil rail is reduced or not needs to be detected in real time, wherein the pressure value of the oil rail can be detected through a rail pressure sensor on the original high-pressure common rail system. When the pressure value in the high-pressure oil rail is detected to drop, the opening condition of the inlet electromagnetic valve is not met, and the inlet electromagnetic valve needs to be closed. Meanwhile, the opening duration of the inlet solenoid valve can change the range of the oil pressure value of the high-pressure reserve cavity, and the range of the oil pressure value of the high-pressure reserve cavity has a certain corresponding relation with the remaining opening times of the outlet solenoid valve, so that the opening times of the outlet solenoid valve can be updated through the opening duration of the inlet solenoid valve. Wherein, whether the pressure value through detecting the high pressure oil rail after opening the entry solenoid valve descends, can get rid of the risk that exists of supplying oil for high pressure oil rail under high pressure oil rail unstable state.
Further, in an embodiment, the step of updating the opening times of the outlet solenoid valve according to the opening duration of the inlet solenoid valve includes:
determining the increased opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time;
and updating the opening times of the outlet solenoid valve based on the increased opening times of the outlet solenoid valve.
In this embodiment, after the entry solenoid valve opens, the high-pressure oil pump is after for the high pressure reservation chamber injection high pressure, and the oil pressure in high pressure reservation chamber can rise. Therefore, the range of the oil pressure value in the high-pressure reserve cavity can be determined according to the opening duration of the inlet electromagnetic valve and the high-pressure oil injection amount of the high-pressure reserve cavity in unit time. Different oil pressure value ranges of the high-pressure reserve cavity correspond to different residual opening times of the outlet solenoid valve, so that the increased opening times of the outlet solenoid valve after the period of time for opening the inlet solenoid valve can be determined. Because the times of opening the outlet solenoid valve to supplement the pressure to the high-pressure oil rail under the condition that the high-pressure reserved cavity is full-pressurized is a fixed preset value, the opening times of the outlet solenoid valve can be updated based on the increased opening times of the outlet solenoid valve. For example, when the increased opening times of the outlet solenoid valve is determined to be 1 according to the opening duration of the inlet solenoid valve and the high-pressure oil injection amount of the high-pressure reserve cavity in unit time, the number of times of pressure compensation for the high-pressure oil rail by opening the outlet solenoid valve under the condition that the high-pressure reserve cavity is fully pressurized is a fixed preset value of 4, while the known opening times of the outlet solenoid valve is 3, the opening times of the outlet solenoid valve is 1, the increased opening times of the outlet solenoid valve after pressure compensation is 2, and the sum of the opening times and the opening times is a preset value of 4, at this time, the opening times of the outlet solenoid valve can be updated to be 2 according to the increased opening times of 1.
Further, in an embodiment, the step of determining the second preset time period according to the opening times of the outlet electromagnetic valve includes:
determining the range of the pressure value of the residual oil pressure in the high-pressure reserved cavity according to the opening times of the outlet electromagnetic valve;
and determining a second preset time according to the pressure value range of the residual oil pressure in the high-pressure reserved cavity, the target pressure value of the high-pressure reserved cavity and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time.
In this embodiment, the oil pressure reduced by each start of the high-pressure reserve chamber is fixed, that is, the range of the residual pressure value of the high-pressure reserve chamber corresponding to the number of times that the high-pressure reserve chamber has been opened is known. Therefore, the opening times of the outlet solenoid valve can be determined through the opening times of the outlet solenoid valve. And determining the pressure value range of the residual oil pressure of the high-pressure reserved cavity based on the opening times of the outlet solenoid valve. And determining high-pressure oil required to be supplemented by the high-pressure reserved cavity based on the pressure value range of the residual oil pressure of the high-pressure reserved cavity and the target pressure value of the high-pressure reserved cavity. And then determining a second preset time according to the high-pressure oil injection amount of the high-pressure reserved cavity in unit time.
In the embodiment, a high-pressure reserved cavity is added on the basic structure of the original high-pressure common rail system, when the diesel engine is started, the outlet electromagnetic valve is opened, the opening times of the outlet electromagnetic valve is increased by one, and the high-pressure oil rail is pressurized through the high-pressure reserved cavity, wherein the outlet electromagnetic valve is connected with the high-pressure reserved cavity and the high-pressure oil rail oil outlet pipe through the high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by the high-pressure oil pump; and when the pressure value in the high-pressure oil rail is detected to reach a first preset pressure value, closing the outlet electromagnetic valve. The high-pressure oil stored in the high-pressure reserved cavity is used for improving the pressure building pressure of the high-pressure oil rail when the diesel engine is started, and the pressure building time of the high-pressure oil rail is shortened, so that the problem that the diesel engine is difficult to start is solved.
In a third aspect, the embodiment of the invention further provides a quick pressure buildup device for starting a diesel engine.
Referring to fig. 4, a functional module diagram of an embodiment of the rapid diesel engine startup pressure buildup apparatus is shown.
In this embodiment, the quick pressure buildup device that the diesel engine starts includes:
the system comprises an outlet electromagnetic valve opening module 10, a high-pressure oil rail and a high-pressure oil pump, wherein the outlet electromagnetic valve opening module is used for opening an outlet electromagnetic valve when the diesel engine is started, adding one to the opening times of the outlet electromagnetic valve, and pressurizing the high-pressure oil rail through a high-pressure reserved cavity, the outlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil outlet pipe through a high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by the high-pressure oil pump;
and the outlet solenoid valve closing module 20 is used for closing the outlet solenoid valve when detecting that the pressure value in the high-pressure oil rail reaches a first preset pressure value.
Further, in an embodiment, the quick pressure buildup device that the diesel engine starts still includes the inlet solenoid valve control template for:
when the diesel engine runs, detecting whether a change value of the rotating speed of the diesel engine in a first preset time period is smaller than a first preset threshold value, whether a change value of the torque of the diesel engine is smaller than a second preset threshold value and whether a pressure change value of a high-pressure oil rail in the diesel engine is smaller than a third preset threshold value;
when the pressure of the high-pressure oil rail is detected to reach a second preset pressure value, the variation value of the rotating speed of the diesel engine within a first preset time is smaller than a first preset threshold value, the variation value of the torque of the diesel engine is smaller than a second preset threshold value, and the variation value of the pressure of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value, an inlet electromagnetic valve is opened to inject high-pressure oil in a high-pressure oil pump into a high-pressure reserved cavity, and the inlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil inlet pipe through a high-pressure reserved cavity oil inlet pipe and is used for controlling the high-pressure oil pump to inject the high-pressure oil into the high-pressure reserved cavity;
determining a second preset time length according to the opening times of the outlet electromagnetic valve;
and when the opening time of the inlet electromagnetic valve reaches a second preset time, closing the inlet electromagnetic valve and resetting the opening times of the outlet electromagnetic valve.
Further, in an embodiment, the inlet solenoid valve control template is further configured to:
detecting whether the pressure in the high-pressure oil rail drops;
and if the pressure in the high-pressure oil rail is detected to be reduced, closing the inlet electromagnetic valve, and updating the opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve.
Further, in an embodiment, the inlet solenoid valve control template is further configured to:
determining the increased opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time;
and updating the opening times of the outlet solenoid valve based on the increased opening times of the outlet solenoid valve.
Further, in an embodiment, the inlet solenoid valve control template is further configured to:
determining the range of the pressure value of the residual oil pressure in the high-pressure reserved cavity according to the opening times of the outlet electromagnetic valve;
and determining a second preset time length according to the pressure value range of the residual oil pressure in the high-pressure reserved cavity, the target pressure value of the high-pressure reserved cavity and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time.
The function realization of each module in the rapid pressure building device started by the diesel engine corresponds to each step in the embodiment of the rapid pressure building method started by the diesel engine, and the function and the realization process are not described in detail herein.
In a fourth aspect, the embodiment of the present invention further provides a readable storage medium.
The readable storage medium of the invention stores the diesel engine starting rapid pressure buildup program, wherein the diesel engine starting rapid pressure buildup program realizes the steps of the diesel engine starting rapid pressure buildup method when being executed by the processor.
The method for implementing the rapid pressure buildup program for starting the diesel engine when executed can refer to the embodiments of the rapid pressure buildup method for starting the diesel engine of the present invention, and details are not repeated here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (8)

1. A quick pressure building method for starting a diesel engine is characterized by comprising the following steps:
when the diesel engine is started, opening an outlet electromagnetic valve, adding one to the opening times of the outlet electromagnetic valve, and pressurizing the high-pressure oil rail through a high-pressure reserved cavity, wherein the outlet electromagnetic valve is connected with the high-pressure reserved cavity and the high-pressure oil rail oil outlet pipe through a high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by a high-pressure oil pump;
when the pressure value in the high-pressure oil rail is detected to reach a first preset pressure value, closing the outlet electromagnetic valve;
when the diesel engine is started, the step of opening the outlet solenoid valve comprises the following steps:
when the diesel engine runs, detecting whether a change value of the rotating speed of the diesel engine in a first preset time period is smaller than a first preset threshold value, whether a change value of the torque of the diesel engine is smaller than a second preset threshold value and whether a pressure change value of a high-pressure oil rail in the diesel engine is smaller than a third preset threshold value;
when the pressure of the high-pressure oil rail is detected to reach a second preset pressure value, the variation value of the rotating speed of the diesel engine in the first preset time is smaller than a first preset threshold value, the variation value of the torque of the diesel engine is smaller than the second preset threshold value, and the variation value of the pressure of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value, an inlet electromagnetic valve is opened to inject high-pressure oil in a high-pressure oil pump into a high-pressure reserved cavity, and the inlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil inlet pipe through a high-pressure reserved cavity oil inlet pipe and is used for controlling the high-pressure oil pump to inject the high-pressure oil into the high-pressure reserved cavity;
determining a second preset time length according to the opening times of the outlet electromagnetic valve;
and when the opening time of the inlet electromagnetic valve reaches a second preset time, closing the inlet electromagnetic valve and resetting the opening times of the outlet electromagnetic valve.
2. The method for rapid buildup of pressure on the start-up of a diesel engine as set forth in claim 1 wherein said step of opening said inlet solenoid valve is followed by the steps of:
detecting whether the pressure in the high-pressure oil rail drops;
and if the pressure in the high-pressure oil rail is detected to be reduced, closing the inlet electromagnetic valve, and updating the opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve.
3. The rapid pressure buildup method of starting a diesel engine according to claim 2, wherein said step of updating the number of times the outlet solenoid valve is opened according to the opening duration of the inlet solenoid valve comprises:
determining the increased opening times of the outlet electromagnetic valve according to the opening time of the inlet electromagnetic valve and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time;
and updating the opening times of the outlet solenoid valve based on the increased opening times of the outlet solenoid valve.
4. The method for rapid buildup of pressure on start-up of a diesel engine according to claim 1, wherein said step of determining a second preset duration based on the number of times the outlet solenoid valve is opened comprises:
determining the range of the pressure value of the residual oil pressure in the high-pressure reserved cavity according to the opening times of the outlet electromagnetic valve;
and determining a second preset time length according to the pressure value range of the residual oil pressure in the high-pressure reserved cavity, the target pressure value of the high-pressure reserved cavity and the high-pressure oil injection amount of the high-pressure reserved cavity in unit time.
5. The utility model provides a quick pressure buildup device that diesel engine started which characterized in that, quick pressure buildup device that diesel engine started includes:
the system comprises an outlet electromagnetic valve opening module, a high-pressure oil rail pressure boosting module and a high-pressure oil rail pressure boosting module, wherein the outlet electromagnetic valve opening module is used for opening an outlet electromagnetic valve when the diesel engine is started, adding one to the opening times of the outlet electromagnetic valve, and boosting the high-pressure oil rail through a high-pressure reserved cavity, the outlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil outlet pipe through a high-pressure reserved cavity oil outlet pipe and is used for controlling the high-pressure reserved cavity to inject high-pressure oil into the high-pressure oil rail, and the high-pressure reserved cavity is used for storing the high-pressure oil injected by a high-pressure oil pump;
the outlet electromagnetic valve closing module is used for closing the outlet electromagnetic valve when the pressure value in the high-pressure oil rail is detected to reach a first preset pressure value;
the quick pressure buildup device that the diesel engine starts still includes entry solenoid valve control template for:
when the diesel engine runs, detecting whether a change value of the rotating speed of the diesel engine in a first preset time period is smaller than a first preset threshold value, whether a change value of the torque of the diesel engine is smaller than a second preset threshold value and whether a pressure change value of a high-pressure oil rail in the diesel engine is smaller than a third preset threshold value;
when the pressure of the high-pressure oil rail is detected to reach a second preset pressure value, the variation value of the rotating speed of the diesel engine within a first preset time is smaller than a first preset threshold value, the variation value of the torque of the diesel engine is smaller than a second preset threshold value, and the variation value of the pressure of the high-pressure oil rail in the diesel engine is smaller than a third preset threshold value, an inlet electromagnetic valve is opened to inject high-pressure oil in a high-pressure oil pump into a high-pressure reserved cavity, and the inlet electromagnetic valve is connected with the high-pressure reserved cavity and a high-pressure oil rail oil inlet pipe through a high-pressure reserved cavity oil inlet pipe and is used for controlling the high-pressure oil pump to inject the high-pressure oil into the high-pressure reserved cavity;
determining a second preset time length according to the opening times of the outlet electromagnetic valve;
and when the opening time of the inlet electromagnetic valve reaches a second preset time, closing the inlet electromagnetic valve, and resetting the opening times of the outlet electromagnetic valve.
6. The diesel engine-started rapid pressure buildup apparatus according to claim 5, wherein said inlet solenoid control template is further configured to:
detecting whether the pressure in the high-pressure oil rail is reduced;
and if the pressure in the high-pressure oil rail is detected to be reduced, closing the inlet electromagnetic valve, and updating the opening times of the outlet electromagnetic valve according to the opening duration of the inlet electromagnetic valve.
7. A diesel engine initiated rapid pressure build-up apparatus comprising a processor, a memory, and a diesel engine initiated rapid pressure build-up program stored on the memory and executable by the processor, wherein the diesel engine initiated rapid pressure build-up program when executed by the processor implements the steps of the diesel engine initiated rapid pressure build-up method as claimed in any one of claims 1 to 4.
8. A readable storage medium, characterized in that the readable storage medium stores thereon a diesel engine started fast pressure buildup program, wherein the diesel engine started fast pressure buildup program, when executed by a processor, implements the steps of the diesel engine started fast pressure buildup method according to any one of claims 1 to 4.
CN202210271812.4A 2022-03-18 2022-03-18 Rapid pressure building method, device and equipment for starting diesel engine and readable storage medium Active CN114673601B (en)

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