CN109779776B - Electronic control system and variable fuel injection pressure control method for internal combustion engine - Google Patents
Electronic control system and variable fuel injection pressure control method for internal combustion engine Download PDFInfo
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- CN109779776B CN109779776B CN201810806426.4A CN201810806426A CN109779776B CN 109779776 B CN109779776 B CN 109779776B CN 201810806426 A CN201810806426 A CN 201810806426A CN 109779776 B CN109779776 B CN 109779776B
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Abstract
The invention provides an electronic control system and a variable fuel injection pressure control method of an internal combustion engine, wherein the variable fuel injection pressure control method of the internal combustion engine comprises the following steps: the parameter acquisition module acquires a working stage judgment parameter and a current working stage influence parameter of the current internal combustion engine; the stage judgment module judges the current working stage of the current internal combustion engine according to the working stage judgment parameters; and the oil injection pressure control module calls a corresponding target oil injection pressure list stored in the storage module according to the current working stage, determines a target oil injection pressure value according to the target oil injection pressure list and the current working stage influence parameters, and adjusts the current oil injection pressure to the target oil injection pressure value. The control method can adjust the injection pressure based on the real-time working condition of the internal combustion engine, ensure the optimal emission of each gaseous substance, and ensure that the emission meets the emission relevant regulations.
Description
Technical Field
The invention relates to the field of automobile engine control, in particular to an electronic control system and a variable oil injection pressure control method of an internal combustion engine.
Background
The system injection pressure of the traditional port injection gasoline engine PFI (PortFuel injection) is limited according to a pressure regulating valve and is kept constant in all working conditions. The oil pump can continuously deliver fuel to the oil rail to maintain the basic injection pressure of the fuel injector, and the single fuel supply injection mode cannot realize the real-time change of the injection pressure along with the working condition.
The national fifth emission regulations only limit gaseous pollutants for PFI engines, and the New European Driving Cycle (NEDC) is relatively smooth, the conventional constant pressure injection mode does not affect the PFI engine to meet the requirements of the national fifth emission regulations. However, since 2020, the six state discharge regulation is fully applied, and there are several prominent features in the six state regulation to be applied in the future compared to the five state discharge regulation in the past: the requirements for the quality (PM) and the quantity (quantity) of particulate matters are increased no matter the PFI engine or the direct injection (GDI) engine is adopted, the requirements for the control and the performance of a PFI engine system are improved due to the change, and the difficulty of system development is increased; secondly, the emission Test cycle does not adopt a relatively gentle NEDC cycle any more, and is changed into a more dynamic global Light vehicle unified driving cycle WLTC (world wide modified Light vehicles Test cycle), and on the basis, the real vehicle road emission Test RDE (real driving emission) Test and the limit requirement are added, and the control difficulty of gaseous and particulate matter emission is undoubtedly further increased by the change of the Test environment. In addition, PFI engines are simpler and more singular in terms of emissions system control means than GDI engines. Therefore, these internal and external factors analyzed above undoubtedly make the upcoming national six-emissions legislation requirements still a huge challenge for conventional PFI engines.
Under the environment and the background, the original single stable constant-pressure oil injection control strategy of the PFI engine is changed, the oil injection pressure is adjusted and controlled in a variable and real-time manner according to the actual emission performance under different working conditions, the flexible pressure control strategy is adopted to optimize the emission pollutants under different dynamic working conditions so as to achieve the purpose of controlling various emissions, and increasingly strict national six-emission regulation requirements are met. A series of studies showed that: the variable injection pressure control strategy is one of the most important system control strategies for PFI engines to effectively solve the emission problem and meet the national six regulations.
There is currently no existing, sophisticated system control strategy for PFI engines for continuously variable oil pressure control.
Disclosure of Invention
The invention aims to solve the technical problem that the single oil supply and injection mode cannot realize the real-time adjustment of the injection pressure along with the change of the working condition.
In order to solve the above technical problem, the present invention provides an electronic control system, including:
the storage module is used for storing a target oil injection pressure list of each working stage of the internal combustion engine, the target oil injection pressure list is a table of corresponding relations between working stage influence parameters and target oil injection pressure values, and the working stages comprise a cold starting stage, a warming stage and a heat engine stage;
the parameter acquisition module is used for acquiring the working stage judgment parameters and the current working stage influence parameters of the current internal combustion engine;
the stage judgment module is used for judging the current working stage of the current internal combustion engine according to the working stage judgment parameters;
and the oil injection pressure control module is used for calling a corresponding target oil injection pressure list in the storage module according to the current working stage, determining a target oil injection pressure value according to the influence parameters of the current working stage, and adjusting the current oil injection pressure to the target oil injection pressure value.
Optionally, in the electronic control system, the working phase determination parameters are engine speed and engine coolant temperature.
Optionally, in the electronic control system, the phase determining module operates as follows:
judging whether the rotating speed of the internal combustion engine is smaller than a rotating speed threshold value of the internal combustion engine in a starting stage, if so, judging that the current working stage is a cold starting stage; if not, judging whether the temperature of the cooling liquid of the internal combustion engine is in the working temperature range or not, if so, judging that the current working stage is a heat engine stage, and if not, judging that the current working stage is a warming stage.
Optionally, in the electronic control system, when the operating phase of the internal combustion engine is a cold start phase, the operating phase influencing parameters are: internal combustion engine coolant temperature at start-up;
when the working phase of the internal combustion engine is a warming-up phase, the working phase influence parameters are as follows: the temperature of the cooling liquid of the internal combustion engine, a heating state signal of a catalyst, the rotating speed of the internal combustion engine, the load of the internal combustion engine and an oil injection turn signal of the internal combustion engine are detected when the internal combustion engine is started;
when the working phase of the internal combustion engine is a heat engine phase, the working phase influence parameters are as follows: engine speed and engine load.
Optionally, in the electronic control system, the fuel injection pressure control module includes a correction module, configured to correct the target fuel injection pressure value of the current working stage according to the correction factor of the current working stage.
Optionally, in the electronic control system, when the current working phase is a cold start phase or a heat engine phase, the correction factor is an altitude signal and an intake air temperature signal;
and when the current working stage is a warming stage, the correction factors are an altitude signal, an air inlet temperature signal and a cooling liquid temperature signal of the internal combustion engine.
Optionally, in the electronic control system, the oil injection pressure control module further includes a limiting module, configured to limit an upper limit and a lower limit of the target oil injection pressure value and a change gradient of the target oil injection pressure value in the current working stage.
The invention also provides a variable fuel injection pressure control method of the internal combustion engine, which comprises the following steps:
s1: the parameter acquisition module acquires a working stage judgment parameter and a current working stage influence parameter of the current internal combustion engine;
s2: the stage judgment module judges the current working stage of the current internal combustion engine according to the working stage judgment parameters;
s3: and the oil injection pressure control module calls a corresponding target oil injection pressure list stored in the storage module according to the current working stage, determines a target oil injection pressure value according to the target oil injection pressure list and the current working stage influence parameters, and adjusts the current oil injection pressure to the target oil injection pressure value.
Alternatively, in the variable injection pressure control method of an internal combustion engine, the operating phase determination parameters are an engine speed and an engine coolant temperature, and S2 includes the steps of:
judging whether the rotating speed of the internal combustion engine is smaller than a rotating speed threshold value of the internal combustion engine in a starting stage, if so, judging that the current working stage is a cold starting stage; if not, judging whether the current temperature of the internal combustion engine coolant is in a working temperature range, if so, judging that the current working stage is a heat engine stage, and if not, judging that the current working stage is a warming stage.
Optionally, in the method for controlling a variable injection pressure of an internal combustion engine, in S3, after determining the target injection pressure value according to the current operating stage influence parameter, before adjusting the current injection pressure to the target injection pressure value, the method further includes the following steps:
and correcting the target oil injection pressure value of the current working stage by using an oil injection pressure control module according to the correction factor of the current working stage, and/or limiting the upper limit and the lower limit of the target oil injection pressure value and the variation gradient of the target oil injection pressure value by using the oil injection pressure control module.
Optionally, in the method for controlling variable fuel injection pressure of an internal combustion engine, when the current working stage is a cold start stage or a heat engine stage, the correction factors are an altitude signal and an intake air temperature signal;
and when the current working stage is a warming stage, the correction factors are an altitude signal, an air inlet temperature signal and a cooling liquid temperature signal of the internal combustion engine.
Optionally, in the variable injection pressure control method for an internal combustion engine, when the current working stage is a cold start stage, the injection pressure control mode includes a constant target pressure control mode and a maximum injection pressure mode; under the constant target pressure control mode, the oil injection pressure control module adjusts the current oil injection pressure to the target oil injection pressure value; and under the maximum oil injection pressure mode, adjusting the current oil injection pressure to be the maximum pressure value of the pressure regulating valve of the internal combustion engine.
Alternatively, in the variable injection pressure control method of an internal combustion engine, the injection pressure control mode operation process includes the steps of:
a constant target pressure control mode or a maximum injection pressure mode is selected based on the results of comprehensively evaluating the start-up safety and the start-up emission performance.
Optionally, in the variable fuel injection pressure control method for the internal combustion engine, when the current working phase is a warm-up phase, the fuel injection pressure control mode includes a constant target pressure control mode and a dynamic target pressure control mode;
in the constant target pressure control mode, the current working stage influence parameter is the temperature of the cooling liquid of the internal combustion engine during starting, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value;
and under the dynamic target pressure control mode, the current working stage influence parameters are the rotating speed and the load of the internal combustion engine, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value.
Optionally, in the method for controlling variable injection pressure of an internal combustion engine, before the injection pressure control module adjusts the current injection pressure to the corresponding target injection pressure value in the constant target pressure control mode, the method includes the following steps:
judging whether the current temperature is lower than 0 ℃ according to the temperature of the cooling liquid at the starting moment of the internal combustion engine, if so, acquiring the current oil injection turn of the internal combustion engine and the temperature of the cooling liquid at the starting moment of the internal combustion engine, calculating a multiplication correction factor as a correction coefficient of the current target pressure value to correct the target pressure value in sections, and adjusting the current oil injection pressure to the target oil injection pressure value after the section correction; if not, the current oil injection pressure is directly adjusted to the corresponding target oil injection pressure value.
Optionally, in the method for controlling variable injection pressure of an internal combustion engine, in the constant target pressure control mode, before the injection pressure control module adjusts the current injection pressure to the corresponding target injection pressure value, the method further includes the following steps:
judging whether the current catalyst is in a heating state, if so, correcting a target oil injection pressure value by combining an influence factor of the catalyst on the running state of the internal combustion engine, and adjusting the current oil injection pressure to the corrected target oil injection pressure value; if not, the current oil injection pressure is directly adjusted to the corresponding target oil injection pressure value.
Optionally, in the method for controlling variable fuel injection pressure of an internal combustion engine, the current operating stage is a warm-up stage, and when the catalyst is in a heating state or a non-heating state, the switching process between the constant target pressure control mode and the dynamic target pressure control mode is as follows:
setting a switching time threshold value, and starting timing from the starting of the internal combustion engine;
adopting a constant target pressure control mode between the start of the internal combustion engine and the time threshold value;
and starting filtering calculation to switch to the dynamic target pressure control mode when the internal combustion engine is started and reaches the time threshold.
Optionally, in the method for controlling variable fuel injection pressure of an internal combustion engine, when the current working phase is a heat engine phase, the control mode of the fuel injection pressure control module includes a dynamic target pressure control mode;
in the dynamic target pressure control mode, the current working stage influence parameters are the rotating speed and the load of the internal combustion engine, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value.
The scheme provided by the invention can realize the variable oil pressure electric spraying function of the PFI gasoline engine, can timely, accurately and flexibly control the oil spraying pressure based on the working condition change and the requirement of discharge control, effectively avoids the 'wall wetting effect' of the air inlet valve caused by overlarge spraying pressure, reduces PN discharge, simultaneously considers the optimal fuel oil atomization effect under each working condition, ensures the optimal discharge of each gas, and is beneficial to a PFI electric spraying system to meet the requirements of the national six and later discharge regulations.
Drawings
FIG. 1 is a schematic diagram of an electronic control system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a variable injection pressure control method for an internal combustion engine according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a method for controlling variable injection pressure of an internal combustion engine according to an embodiment of the present invention.
In the figure: 10-a parameter acquisition module; 11-a stage judgment module; 12-oil injection pressure control module; 13-memory module.
Detailed Description
The electronic control system and the variable injection pressure control method of the internal combustion engine according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Certain terms are used throughout the description and claims to refer to particular system components. As one skilled in the art will appreciate, different companies may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the description and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to …".
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
Furthermore, each of the embodiments described below has one or more technical features, and thus, the use of the technical features of any one embodiment does not necessarily mean that all of the technical features of any one embodiment are implemented at the same time or that only some or all of the technical features of different embodiments are implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the invention.
The present invention will be described in more detail with reference to the accompanying drawings, in order to make the objects and features of the present invention more comprehensible, embodiments thereof will be described in detail below, but the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described.
Example one
Please refer to fig. 1, which is a schematic structural diagram of an electronic control system in the present embodiment. As shown in fig. 1, the electronic control system includes: the device comprises a storage module 13, a parameter acquisition module 10, a stage judgment module 11 and an oil injection pressure control module 12, wherein the storage module 13 is used for storing a target oil injection pressure list of each working stage of the internal combustion engine, the target oil injection pressure list is a table of corresponding relations between working stage influence parameters and target oil injection pressure values, and the working stages comprise a cold start stage, a warm-up stage and a heat engine stage; the parameter obtaining module 10 is used for obtaining a working stage judgment parameter and a current working stage influence parameter of the current internal combustion engine; the phase judgment module 11 is configured to judge a current working phase of the current internal combustion engine according to the working phase judgment parameter; the oil injection pressure control module 12 is configured to call a corresponding target oil injection pressure list in the storage module 13 according to the current working stage, determine a target oil injection pressure value according to the current working stage influence parameter, and adjust the current oil injection pressure to the target oil injection pressure value.
The electronic control system provided in the present embodiment will be described in detail with reference to the drawings. It should be noted that the division of each module of the electronic control system is only a division of logical functions, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the x module may be a processing element separately set up, or may be integrated into a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and a processing element of the apparatus calls and executes the following functions of the x module. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, the steps of the above method or the following modules may be implemented by hardware integrated logic circuits in a processor element or instructions in software.
Wherein, the working phase judging parameters are the rotating speed of the internal combustion engine and the temperature of the cooling liquid of the internal combustion engine, and the working process of the phase judging module 11 is as follows:
judging whether the rotating speed of the internal combustion engine is smaller than a rotating speed threshold value of the internal combustion engine in a starting stage, if so, judging that the current working stage is a cold starting stage; if not, judging whether the temperature of the cooling liquid of the internal combustion engine is in the working temperature range or not, if so, judging that the current working stage is a heat engine stage, and if not, judging that the current working stage is a warming stage.
In this embodiment, when the working phase of the internal combustion engine is the cold start phase, the working phase influence parameters are as follows: internal combustion engine coolant temperature at start-up; when the working phase of the internal combustion engine is a warming-up phase, the working phase influence parameters are as follows: when the internal combustion engine is started, the temperature of cooling liquid of the internal combustion engine, a heating state signal of a catalytic converter, the rotating speed of the internal combustion engine, the load of the internal combustion engine and an oil injection turn number signal of the internal combustion engine are obtained; when the working phase of the internal combustion engine is a heat engine phase, the working phase influence parameters are as follows: engine speed and engine load. The method comprises the steps of setting a target oil injection pressure value according to the work influence parameters, and establishing a target oil injection pressure list of each work stage of the internal combustion engine.
Preferably, the oil injection pressure control module 12 includes a correction module, and the correction module corrects the target oil injection pressure value in the current working stage according to the correction factor in the current working stage, so as to reduce the influence of different environments on the atomization and combustion states of the fuel oil. When the current working stage is a cold start stage or a heat engine stage, the correction factors are an altitude signal and an intake air temperature signal; and when the current working stage is a warming stage, the correction factors are an altitude signal, an air inlet temperature signal and a cooling liquid temperature signal of the internal combustion engine.
Further, the oil injection pressure control module 12 further includes a limiting module, configured to limit an upper limit and a lower limit of the target oil injection pressure value in the current working stage and a variation gradient of the target oil injection pressure value. The limiting function of the upper limit and the lower limit of the target oil injection pressure value relates to the setting of the maximum safe rail pressure and the minimum safe rail pressure, on one hand, the maximum pressure which can be borne by the parts is considered, the parts are protected, and on the other hand, the limiting function aims at preventing flameout caused by insufficient oil supply of the vehicle due to too low pressure of the low-pressure oil pump. The change gradient limiting function of the target fuel injection pressure is used for preventing overlarge pressure fluctuation of the low-pressure oil way, inaccurate fuel injection amount in the transient process and the need of limiting the change slope of the low-pressure oil way pressure.
Example two
Referring to fig. 2, a flow chart of the method for controlling the variable injection pressure of the internal combustion engine according to the present embodiment is shown. As shown in fig. 2, the variable injection pressure control method of an internal combustion engine using the electronic control system as described above, which is a thermal internal combustion engine that burns fuel inside a machine and directly converts the thermal energy emitted therefrom into power, mainly includes the steps of:
first, step S1 is executed: the parameter acquisition module acquires a working stage judgment parameter and a current working stage influence parameter of the current internal combustion engine;
next, step S2 is executed: the stage judgment module judges the current working stage of the current internal combustion engine according to the working stage judgment parameters; preferably, the operating phase determining parameters are engine speed and engine coolant temperature, and S2 includes the steps of: judging whether the rotating speed of the internal combustion engine is smaller than a rotating speed threshold value of the internal combustion engine in a starting stage, if so, judging that the current working stage is a cold starting stage; if not, judging whether the temperature of the cooling liquid of the internal combustion engine is in the working temperature range or not, if so, judging that the current working stage is a heat engine stage, and if not, judging that the current working stage is a warming stage.
Next, step S3 is executed: and the oil injection pressure control module calls a corresponding target oil injection pressure list stored in the storage module according to the current working stage, determines a target oil injection pressure value according to the target oil injection pressure list and the current working stage influence parameters, and adjusts the current oil injection pressure to the target oil injection pressure value.
By adopting the oil injection control method, the single invariable oil injection pressure mode adopted in the prior art is changed, the oil injection pressure is adjusted to the corresponding target oil injection pressure value by acquiring the current working stage of the internal combustion engine and the current working stage influence parameters, the emission and the oil consumption are considered, and the optimal target oil injection pressure under each working condition parameter (namely the current working stage influence parameter) is selected, so that the aim of considering the emission, the oil consumption and the running stability of the internal combustion engine is fulfilled.
Preferably, after determining the target injection pressure value according to the current working stage influence parameter, the method further includes the following steps before adjusting the current injection pressure to the target injection pressure value:
and correcting the target oil injection pressure value of the current working stage by using an oil injection pressure control module according to the correction factor of the current working stage, and/or limiting the upper limit and the lower limit of the target oil injection pressure value and the change gradient of the target oil injection pressure value by using the oil injection pressure control module. Therefore, the accuracy of the target oil injection pressure value is improved, and the method has universality.
In order to flexibly control the oil injection pressure of the internal combustion engine, corresponding oil injection pressure control modes are set for each stage of the internal combustion engine so as to take account of differences under different working conditions, ensure safety and effectively reduce pollutant discharge.
Specifically, please refer to fig. 3, which is a block diagram illustrating a method for controlling a variable injection pressure of an internal combustion engine. As shown in fig. 3, when the current operation stage is the cold start stage, the injection pressure control mode includes a constant target pressure control mode and a maximum injection pressure mode; under the constant target pressure control mode, the oil injection pressure control module adjusts the current oil injection pressure to the target oil injection pressure value; and under the maximum oil injection pressure mode, adjusting the current oil injection pressure to be the maximum pressure value of the pressure regulating valve of the internal combustion engine.
In the cold start phase, whether the constant target pressure control mode is selected or the maximum injection pressure mode is selected in the injection pressure control mode is as follows:
the specific selection is selected according to the results of comprehensively evaluating the starting safety and the starting emission performance. Generally, the starting safety is high when the injection pressure is large, but the injection pressure is large, so that the wall wetting phenomenon of the internal combustion engine is caused, and the pollutant discharge amount is increased. During the selection process, the invention firstly ensures the starting safety (injection with larger injection pressure) and then considers the starting emission. Once the maximum injection pressure mode is enabled, all starting temperature points are injected with maximum injection pressure to start the internal combustion engine, and if the emissions result is normal at each starting temperature point, the maximum injection pressure mode may be enabled. The constant target pressure control mode can set the target injection pressure according to different starting temperature points respectively, and if the emission does not pass through some starting temperature points, the flexible control mode is adopted to optimize the emission. For the specific selection of the oil injection pressure control mode in the cold starting stage, the subjective selection is stronger, and the control logic is not switched by automatic judgment of the system.
When the maximum injection pressure mode is adopted, the pressure regulating valve limits the variable control of the injection pressure under the pressure, the injection pressure in the starting stage under the maximum injection pressure mode can adopt the maximum injection pressure injection (open loop control) of the system, the injection pressure can be ensured to be capable of flushing the pressure regulating valve, and the internal combustion engine is ensured to be started safely at the maximum injection pressure allowed by the system. Each low-pressure oil supply way of the internal combustion engine is provided with a pressure regulating valve, the specification is different from 3.5 to 6bar, or the specification pressure is higher. The cold start stage time is very short, the start time above 20 ℃ can not exceed 3s, the extremely low temperature (35 ℃ below zero) is generally 3-8 s along with the reduction of the start water temperature, and a large amount of pollutants are generated under the common condition. The lower injection pressure is unfavorable for fuel atomization, the oil jet penetration distance and the spray cone angle increase with the increase of the injection pressure, the higher injection pressure increases the possibility of wall wetting to some extent, the oil film adhesion on the wall surface of the air inlet passage and the air inlet valve is easily increased at low temperature, and unburned fuel is discharged in the form of HC pollutants. Therefore, the constant target pressure control mode can well control the phase of the exhaust. When a constant target pressure control mode is adopted, water temperature intervals at different starting moments can be divided, and a proper target oil injection pressure value in a starting stage is selected according to actual emission control.
When the current working stage is a warm-up stage, the oil injection pressure control mode comprises a constant target pressure control mode and a dynamic target pressure control mode, and the difference between the two control modes is the difference of the influence parameters of the working stage; in the constant target pressure control mode, the current working stage influence parameter is the temperature of the cooling liquid of the internal combustion engine during starting, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value; and under the dynamic target pressure control mode, the current working stage influence parameters are the rotating speed and the load of the internal combustion engine, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value.
Preferably, when the current working stage is in the warm-up stage, before the fuel injection pressure control module adjusts the current fuel injection pressure to the corresponding target fuel injection pressure value, it is further required to perform two corrections on the target fuel injection pressure value determined in the target fuel injection pressure list: 1) acquiring the state of the catalyst by combining with a catalyst heating state signal, and selecting whether a target oil injection pressure value needs to be further corrected; 2) and judging whether the current temperature is lower than 0 ℃ or not according to the temperature of the cooling liquid at the starting moment of the internal combustion engine, and selecting whether the target oil injection pressure value needs to be further corrected in a segmented manner or not.
The process of 1) is specifically as follows: judging whether the current catalyst is in a heating state, if so, correcting a target oil injection pressure value by combining an influence factor of the catalyst on the running state of the internal combustion engine, and adjusting the current oil injection pressure to the corrected target oil injection pressure value; if not, the current oil injection pressure is directly adjusted to the corresponding target oil injection pressure value.
The process of 2) comprises the following specific steps: judging whether the current temperature is lower than 0 ℃ according to the temperature of the cooling liquid at the starting moment of the internal combustion engine, if so, acquiring the current oil injection turn of the internal combustion engine and the temperature of the cooling liquid at the starting moment of the internal combustion engine, calculating a multiplication correction factor as a correction coefficient of the current target pressure value to correct the target pressure value in sections, and adjusting the current oil injection pressure to the target oil injection pressure value after the section correction, thereby realizing the constant-pressure section oil injection control after the starting; if not, the current oil injection pressure is directly adjusted to the corresponding target oil injection pressure value (namely segmented correction is not needed).
The current working phase is the warm-up phase, under the control mode of invariable target pressure, can compromise the equilibrium that reduces pollutant emission and guarantee the start security through these twice corrections, selects the fuel injection pressure after starting in a flexible way to realize carrying out fuel injection with a certain fixed pressure value in the specific time after the start, can optimize the catalyst converter after the start under the catalyst converter heating state and heat idle condition and discharge pollutants.
The current working stage is a warming-up stage, pollutant emission and oil consumption can be reduced through the two corrections under the dynamic target pressure control mode, the oil injection pressure is matched with the change of relevant parameters (oil injection quantity, ignition angle, oil injection phase, VVT angle and the like) of each working condition of the internal combustion engine in real time, the fuel oil of the internal combustion engine reaches the optimal fuel oil atomization and combustion state under each working condition, and the pollutant emission generated under the dynamic working condition of the vehicle is optimized.
The method comprises the steps that when a current working phase is a warming-up phase and a current catalyst is in a heating state or a non-heating state, a constant target pressure control mode and a dynamic target pressure control mode are included.
When the front catalyst is in a heating state or a non-heating state, switching between a constant target pressure control mode and a dynamic target pressure control mode is involved, and the necessity of switching is represented as follows: the working condition of the internal combustion engine can be changed in real time along with the continuous running of the internal combustion engine, if a constant target pressure control mode is adopted all the time, the conditions that the rotating speed of the internal combustion engine is normal but the pollutant discharge amount and the oil consumption are not met can occur, and therefore the current condition needs to be improved by switching to a dynamic target pressure control mode, and vice versa.
Wherein, the switching process between the constant target pressure control mode and the dynamic target pressure control mode is as follows: setting a switching time threshold value, and starting timing from the starting of the internal combustion engine; adopting a constant target pressure control mode between the start of the internal combustion engine and the time threshold value; and starting filtering calculation to switch to the dynamic target pressure control mode when the internal combustion engine is started and reaches the time threshold. For example, the catalyst is in a heating state, and if the time threshold is set to 0, the catalyst directly enters a dynamic target pressure control mode after being started; if the time threshold is set to t, a constant target pressure control mode is adopted within t time after starting, filtering calculation is triggered at t moment, the dynamic target pressure control mode is switched to gently, and filtering time is determined according to actual oil injection pressure performance.
When the current working phase is a heat engine phase, the control mode of the oil injection pressure control module comprises a dynamic target pressure control mode; in the dynamic target pressure control mode, the current working stage influence parameters are the rotating speed and the load of the internal combustion engine, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the variable injection pressure control method of the internal combustion engine disclosed in the second embodiment, the electronic control system disclosed in the first embodiment is adopted, so that the description is relatively simple, and relevant points can be referred to the description of the first embodiment.
In summary, the present invention provides an electronic control system and a variable injection pressure control method for an internal combustion engine, the variable injection pressure control method for an internal combustion engine comprising: the parameter acquisition module acquires a working stage judgment parameter and a current working stage influence parameter of the current internal combustion engine; the stage judgment module judges the current working stage of the current internal combustion engine according to the working stage judgment parameters; and the oil injection pressure control module calls a corresponding target oil injection pressure list stored in the storage module according to the current working stage, determines a target oil injection pressure value according to the target oil injection pressure list and the current working stage influence parameters, and adjusts the current oil injection pressure to the target oil injection pressure value. The control method can adjust the injection pressure based on the real-time working condition of the internal combustion engine, ensure the optimal emission of each gaseous substance, and ensure that the emission accords with the emission relevant regulation.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (17)
1. An electronic control system, comprising:
the storage module is used for storing a target oil injection pressure list of each working stage of the internal combustion engine, the target oil injection pressure list is a table of corresponding relations between working stage influence parameters and target oil injection pressure values, and the working stages comprise a cold starting stage, a warming stage and a heat engine stage;
the parameter acquisition module is used for acquiring the working stage judgment parameters and the current working stage influence parameters of the current internal combustion engine;
the stage judgment module is used for judging the current working stage of the internal combustion engine according to the working stage judgment parameters;
the oil injection pressure control module is used for calling a corresponding target oil injection pressure list in the storage module according to the current working stage, determining a target oil injection pressure value according to the influence parameters of the current working stage and adjusting the current oil injection pressure to the target oil injection pressure value;
when the current working stage is a warming-up stage, the fuel injection pressure control mode comprises a constant target pressure control mode and a dynamic target pressure control mode, timing is started from the start of the internal combustion engine, the constant target pressure control mode is adopted between the start of the internal combustion engine and a set time threshold, and when the start of the internal combustion engine reaches the time threshold, filtering calculation is started to switch to the dynamic target pressure control mode.
2. The electronic control system according to claim 1, characterized in that the operation stage determination parameters are an engine speed and an engine coolant temperature.
3. The electronic control system according to claim 2, wherein the phase determination module operates as follows:
judging whether the rotating speed of the internal combustion engine is less than a rotating speed threshold value of the internal combustion engine in a starting stage, if so, judging that the current working stage is a cold starting stage; if not, judging whether the current temperature of the internal combustion engine coolant is in a working temperature range, if so, judging that the current working stage is a heat engine stage, and if not, judging that the current working stage is a warming stage.
4. The electronic control system according to claim 1, wherein when the operation stage of the internal combustion engine is a cold start stage, the operation stage influencing parameters are: internal combustion engine coolant temperature at start-up;
when the working phase of the internal combustion engine is a warming-up phase, the working phase influence parameters are as follows: the temperature of the cooling liquid of the internal combustion engine, a heating state signal of a catalyst, the rotating speed of the internal combustion engine, the load of the internal combustion engine and an oil injection turn signal of the internal combustion engine are detected when the internal combustion engine is started;
when the working phase of the internal combustion engine is a heat engine phase, the working phase influence parameters are as follows: engine speed and engine load.
5. The electronic control system of claim 1, wherein the fuel injection pressure control module includes a correction module for correcting the target fuel injection pressure value for the current operating phase based on a correction factor for the current operating phase.
6. The electronic control system of claim 5, wherein when the current operating phase is a cold start phase or a warm engine phase, the correction factors are an altitude signal and an intake air temperature signal;
and when the current working stage is a warming stage, the correction factors are an altitude signal, an air inlet temperature signal and a cooling liquid temperature signal of the internal combustion engine.
7. The electronic control system of claim 5, wherein the fuel injection pressure control module further comprises a limiting module for limiting upper and lower limits of a target fuel injection pressure value and a variation gradient of the target fuel injection pressure value for the current operating phase.
8. A variable injection pressure control method of an internal combustion engine, characterized by using the electronic control system according to claim 1, comprising the steps of:
s1: the parameter acquisition module acquires a working stage judgment parameter and a current working stage influence parameter of the current internal combustion engine;
s2: the stage judgment module judges the current working stage of the internal combustion engine according to the working stage judgment parameters;
s3: and the oil injection pressure control module calls a corresponding target oil injection pressure list stored in the storage module according to the current working stage, determines a target oil injection pressure value according to the target oil injection pressure list and the current working stage influence parameters, and adjusts the current oil injection pressure to the target oil injection pressure value.
9. The variable injection pressure control method of an internal combustion engine according to claim 8, wherein the operation stage determination parameters are an engine speed and an engine coolant temperature, and S2 includes the steps of:
judging whether the rotating speed of the internal combustion engine is less than a rotating speed threshold value of the internal combustion engine in a starting stage, if so, judging that the current working stage is a cold starting stage; if not, judging whether the temperature of the cooling liquid of the internal combustion engine is in the working temperature range or not, if so, judging that the current working stage is a heat engine stage, and if not, judging that the current working stage is a warming stage.
10. The variable injection pressure control method of an internal combustion engine according to claim 8, characterized in that, in S3, after determining the target injection pressure value based on said current operating phase influencing parameter, the current injection pressure is adjusted to the target injection pressure value, further comprising the steps of:
and correcting the target oil injection pressure value of the current working stage by using an oil injection pressure control module according to the correction factor of the current working stage, and/or limiting the upper limit and the lower limit of the target oil injection pressure value and the change gradient of the target oil injection pressure value by using the oil injection pressure control module.
11. The variable injection pressure control method of an internal combustion engine according to claim 10, wherein when the current operation stage is a cold start stage or a heat engine stage, the correction factors are an altitude signal and an intake air temperature signal;
and when the current working stage is a warming stage, the correction factors are an altitude signal, an air inlet temperature signal and a cooling liquid temperature signal of the internal combustion engine.
12. The variable injection pressure control method of an internal combustion engine according to claim 8, wherein when the current operation stage is a cold start stage, the injection pressure control mode includes a constant target pressure control mode and a maximum injection pressure mode; under the constant target pressure control mode, the oil injection pressure control module adjusts the current oil injection pressure to the target oil injection pressure value; and under the maximum oil injection pressure mode, adjusting the current oil injection pressure to be the maximum pressure value of the pressure regulating valve of the internal combustion engine.
13. The variable injection pressure control method of an internal combustion engine according to claim 12, wherein said injection pressure control mode operation process includes the steps of:
a constant target pressure control mode or a maximum injection pressure mode is selected based on the results of comprehensively evaluating the start-up safety and the start-up emission performance.
14. The variable fuel injection pressure control method of an internal combustion engine according to claim 8, wherein in the constant target pressure control mode, the current operating phase influencing parameter is a start-time internal combustion engine coolant temperature, and the fuel injection pressure control module adjusts the current fuel injection pressure to a corresponding target fuel injection pressure value; and under the dynamic target pressure control mode, the current working stage influence parameters are the rotating speed and the load of the internal combustion engine, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value.
15. The variable injection pressure control method of an internal combustion engine according to claim 14, characterized by comprising, before the injection pressure control module adjusts the current injection pressure to the corresponding target injection pressure value in the constant target pressure control mode, the steps of:
judging whether the current temperature is lower than 0 ℃ according to the temperature of the cooling liquid at the starting moment of the internal combustion engine, if so, acquiring the current oil injection turn of the internal combustion engine and the temperature of the cooling liquid at the starting moment of the internal combustion engine, calculating a multiplication correction factor as a correction coefficient of the current target oil injection pressure value so as to correct the target oil injection pressure value in sections, and adjusting the current oil injection pressure to the target oil injection pressure value after the section correction; if not, the current oil injection pressure is directly adjusted to the corresponding target oil injection pressure value.
16. The variable injection pressure control method of an internal combustion engine according to claim 15, characterized by further comprising, before the injection pressure control module adjusts the current injection pressure to the corresponding target injection pressure value in the constant target pressure control mode, the steps of:
judging whether the current catalyst is in a heating state, if so, correcting a target oil injection pressure value by combining an influence factor of the catalyst on the running state of the internal combustion engine, and adjusting the current oil injection pressure to the corrected target oil injection pressure value; if not, the current oil injection pressure is directly adjusted to the corresponding target oil injection pressure value.
17. The variable injection pressure control method of an internal combustion engine according to claim 8, wherein when the current operating phase is a warm-up phase, the control mode of the injection pressure control module includes a dynamic target pressure control mode;
in the dynamic target pressure control mode, the current working stage influence parameters are the rotating speed and the load of the internal combustion engine, and the oil injection pressure control module adjusts the current oil injection pressure to a corresponding target oil injection pressure value.
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