CN115142976A - Method and device for determining zero-oil calibration time - Google Patents
Method and device for determining zero-oil calibration time Download PDFInfo
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- 239000000446 fuel Substances 0.000 claims description 56
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3827—Common rail control systems for diesel engines
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The embodiment of the application provides a method and a device for determining zero oil mass calibration time. Determining a first time in response to the first rail pressure rate of change not matching the second rail pressure rate of change by obtaining a first rail pressure rate of change and a second rail pressure rate of change. And determining a pulse width signal corresponding to the first time from a pulse width signal library. And determining that the pulse width time corresponding to the pulse width signal is zero oil volume calibration time. Therefore, the rail pressure fluctuation caused by the static leakage amount and the dynamic leakage amount of the oil sprayer is considered, the rail pressure slope of the oil sprayer is analyzed for the rail pressure fluctuation when the oil sprayer starts to spray, the slope can change suddenly when the oil sprayer starts to spray, the threshold value needing to be calibrated is greatly reduced, the zero oil mass calibration time can be found without re-calibrating the threshold value for the oil sprayer with different aging or abrasion degrees, time and labor are saved, and the accuracy is high.
Description
Technical Field
The application relates to the technical field of engines, in particular to a method and a device for determining zero oil mass calibration time.
Background
At present, the application of an oil injector in a high-pressure common rail system is increasingly wide. In the application process, the opening and closing of oil injection are controlled through the needle valve when the oil injector is opened and closed, the needle valve cannot be immediately opened to inject oil after the oil injector receives a control signal sent by the electric control unit, the time from the time when the oil injector receives the control signal to the time when the oil injector starts oil injection is the zero oil mass calibration time, and the calibration of the time is called zero oil mass calibration. The zero oil mass calibration time can influence the accuracy of the calculation of the oil injection quantity, so that when the oil injector leaves a factory, a manufacturer can uniformly calibrate the zero oil mass of the oil injector, but along with the daily use of the oil injector, the nozzle of the oil injector can be worn, and when the water or acidic substances in diesel oil are excessive, a needle valve can be clamped due to corrosion; when the sealing conical surface of the needle valve is damaged, combustible mixed gas in the cylinder can also flow into the fuel injector to form carbon deposit, so that the needle valve is clamped, the fuel injector can not inject fuel normally, the time from the control signal to the fuel injector to start fuel injection is prolonged, the control precision is reduced, and the amount of the injected fuel has corresponding deviation. To avoid the effect of these changes on injector usage, calibration of the injector control accuracy is often required to meet control requirements.
At present, a zero fuel quantity calibration method for an oil injector is mainly to set a threshold value according to rail pressure fluctuation, if a pressure change value of a common rail pipe is greater than the threshold value, at this time, a detection result is recorded that the oil injector starts oil injection, and a time value from the time when a control signal is sent to the time when the pressure change in the common rail is greater than the threshold value is recorded as a zero fuel quantity calibration time. However, after the injector receives the control signal, the injector may generate a certain amount of dynamic leakage. At this time, the fuel injector does not start injecting fuel, but the dynamic leakage quantity influences the currently detected rail pressure. That is, the effect of the leakage on the zero fuel calibration is not considered in the current zero fuel calibration method. Therefore, the current calibration process has errors and the calibration precision is low.
Disclosure of Invention
In view of this, the embodiment of the present application provides a method and a device for determining a zero oil amount calibration time, and aims to implement a function of determining the zero oil amount calibration time.
In a first aspect, a method for determining a zero oil calibration time includes:
obtaining a first rail pressure change rate and a second rail pressure change rate, wherein the first rail pressure change rate is determined according to the static leakage amount and the dynamic leakage amount of an oil sprayer in a first time interval, the second rail pressure change rate is determined according to the static leakage amount and the dynamic leakage amount of the oil sprayer in a second time interval, and the first time interval is earlier than the second time interval;
in response to the first rail pressure change rate not being matched with the second rail pressure change rate, determining a first moment, wherein the first moment is a monitoring moment corresponding to the first rail pressure change rate and the second rail pressure change rate;
determining a pulse width signal corresponding to the first time from a pulse width signal library, wherein the pulse width signal library comprises a plurality of time pulse width combinations, the pulse width signals of any two time pulse width combinations in the plurality of time pulse width combinations are different, and the monitoring time is matched with the pulse width signal;
and determining that the pulse width time corresponding to the pulse width signal is a zero oil mass calibration time, wherein the zero oil mass calibration time is the time from the pulse width signal to the oil sprayer for starting oil injection.
Optionally, before obtaining the first rail pressure change rate and the second rail pressure change rate, the method further includes:
acquiring pulse width signals of the oil injector at different monitoring moments;
and storing the monitoring time and the pulse width signal in an associated manner.
Optionally, after determining that the pulse width time corresponding to the pulse width signal is zero oil volume calibration time, the method further includes:
acquiring a first basic time length, wherein the first basic time length is the basic power-on time length of the oil sprayer under the condition of not considering correction;
and calculating the sum of the first basic time length and the zero oil quantity calibration time, and determining the calculation result as the total power-on time length.
Optionally, the first rail pressure change rate is in a direct proportion relationship with a duration corresponding to the first time interval.
Optionally, the second rail pressure variation corresponding to the second time interval is the sum of the static leakage amount, the dynamic leakage amount and the fuel injection amount of the second time interval.
In a second aspect, an embodiment of the present application provides a device for determining a zero oil calibration time, where the device includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first rail pressure change rate and a second rail pressure change rate, the first rail pressure change rate is determined according to the static leakage quantity and the dynamic leakage quantity of an oil injector in a first time interval, the second rail pressure change rate is determined according to the static leakage quantity and the dynamic leakage quantity of the oil injector in a second time interval, and the first time interval is earlier than the second time interval;
the first time determining module is used for responding to the fact that the first rail pressure change rate is not matched with the second rail pressure change rate, and determining a first time, wherein the first time is a monitoring time corresponding to the condition that the first rail pressure change rate is not matched with the second rail pressure change rate;
a pulse width signal determining module, configured to determine a pulse width signal corresponding to the first time from a pulse width signal library, where the pulse width signal library includes a plurality of time pulse width combinations, pulse width signals of any two time pulse width combinations in the plurality of time pulse width combinations are different, and the monitoring time is matched with the pulse width signal;
and the zero oil mass calibration time determining module is used for determining that the pulse width time corresponding to the pulse width signal is the zero oil mass calibration time, and the zero oil mass calibration time is the time from the pulse width signal to the oil sprayer to start oil injection.
Optionally, the apparatus further comprises:
the pulse width signal acquisition module is used for acquiring pulse width signals of the oil injector at different monitoring moments;
and the association storage module is used for associating and storing the monitoring time and the pulse width signal.
Optionally, the apparatus further comprises:
the first basic time length obtaining module is used for obtaining a first basic time length, and the first basic time length is the basic power-on time length of the oil sprayer under the condition that correction is not considered;
and the total power-on time length determining module is used for calculating the sum of the first basic time length and the zero oil mass calibration time and determining the calculation result as the total power-on time length.
Optionally, the first rail pressure change rate is in a direct proportion relationship with a duration corresponding to the first time interval.
Optionally, the second rail pressure variation corresponding to the second time interval is the sum of the static leakage amount, the dynamic leakage amount and the fuel injection amount of the second time interval.
The embodiment of the application provides a method and a device for determining zero oil mass calibration time. In performing the method, a first rate of change of rail pressure and a second rate of change of rail pressure are obtained, and a first time is determined in response to the first rate of change of rail pressure not matching the second rate of change of rail pressure. And determining a pulse width signal corresponding to the first time from a pulse width signal library. And determining that the pulse width time corresponding to the pulse width signal is zero oil volume calibration time. Therefore, the rail pressure fluctuation caused by the static leakage amount and the dynamic leakage amount of the oil sprayer is comprehensively considered, the rail pressure change rate of the rail pressure fluctuation is analyzed during pilot injection, the dynamic leakage amount can be greatly increased when the oil sprayer starts the oil sprayer, the direct proportion relation with a time variable is avoided, the rail pressure change rate can change suddenly, and the time of the pulse width corresponding to the turning point of the rail pressure change rate mutation can be determined to be the time of zero oil mass calibration. Compared with the prior art that whether oil injection is carried out is judged according to the rail pressure fluctuation set threshold, the zero oil mass calibration time determining mode is more flexible, the threshold needing to be calibrated is greatly reduced, the zero oil mass calibration time can be found without re-calibrating the threshold of an oil injector with different aging degrees or abrasion degrees, time and labor are saved, and the accuracy is higher.
Drawings
To illustrate the technical solutions in the present embodiment or the prior art more clearly, the drawings needed to be used in the description of the embodiment or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining a zero-oil calibration time according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for determining a zero-oil calibration time according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a device for determining a zero oil calibration time according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As described above, the current method for determining the zero fuel amount calibration time is to set a threshold according to rail pressure fluctuation, so that if the pressure change of the common rail pipe is greater than the threshold, the fuel injector starts to inject fuel, and the time from when the control signal is sent to when the pressure change in the common rail is greater than a certain value is the zero fuel amount calibration. However, through research, the inventor finds that when the injector is opened (at this time, no oil is injected), the injector has a dynamic leakage condition, and when the injector is opened and at this time, no oil is injected, at this time, a sudden change condition still exists when the rail pressure in the common rail pipe is detected, that is, the influence of the dynamic leakage condition on the zero oil mass calibration is not considered in the current detection method, and such a method for determining the zero oil mass calibration time by the calibration limit value is time-consuming and labor-consuming and has low precision.
In order to solve the problem, the embodiment of the application provides a method and a device for determining the zero oil amount calibration time. The method comprises the steps of obtaining a first rail pressure change rate and a second rail pressure change rate, and determining a first moment in response to the first rail pressure change rate not being matched with the second rail pressure change rate. And determining a pulse width signal corresponding to the first time from a pulse width signal library. And determining that the pulse width time corresponding to the pulse width signal is zero oil volume calibration time. Therefore, the rail pressure fluctuation caused by the static leakage amount and the dynamic leakage amount of the oil sprayer is comprehensively considered, the rail pressure change rate of the rail pressure fluctuation is analyzed during pilot injection, the dynamic leakage amount can be greatly increased when the oil sprayer starts the oil sprayer, the direct proportion relation with a time variable is avoided, the rail pressure change rate can change suddenly, and the time of the pulse width corresponding to the turning point of the rail pressure change rate mutation can be determined to be the time of zero oil mass calibration. Compared with the prior art that whether oil injection is judged according to the rail pressure fluctuation set threshold value, the zero oil mass calibration time determining mode has higher flexibility, the threshold value needing to be calibrated is greatly reduced, the zero oil mass calibration time can be found without re-calibrating the threshold value of an oil injector with different aging degrees or different wear degrees, time and labor are saved, and the accuracy is higher.
The method provided by the embodiment of the application is executed by a controller, the controller can control each part in the system, and the controller can comprise a plurality of electronic control units, so that the method is realized. For example, the controller may send different fuel injection pulsewidth signals to the injector and monitor rail pressure fluctuations before the injector begins to receive signals and after injection ends. The controller can make command calls, for example, when calculating the power-on time of the fuel injector, a manufacturer can provide a fuel injection power-on time inquiry MAP (computer command), the controller inquires to obtain a basic MAP (without considering the basic time of correction such as delay) by calling the MAP, and adds the zero fuel quantity calibration time to the basic power-on time to obtain the final power-on time.
The following describes a method for determining the zero oil calibration time provided by the present application, by way of an example. Referring to fig. 1, fig. 1 is a flowchart of a method for determining a zero-oil calibration time according to an embodiment of the present application, including:
s101: a first rail pressure change rate and a second rail pressure change rate are obtained.
The first rail pressure change rate is determined according to the static leakage amount and the dynamic leakage amount of the oil injector in a first time interval, and the second rail pressure change rate is determined according to the static leakage amount and the dynamic leakage amount of the oil injector in a second time interval.
In an actual application scenario, when the engine is in an over run (exceeding a limit) state, the high-pressure oil pump does not supply oil to the common rail pipe any more, and the oil injector does not perform the action of the oil injector, if the oil injector is a non-static leakage oil injector, the rail pressure will be kept constant. At the moment, an Electronic Control Unit (ECU) sends signals of different injector pulse widths to the injector, and the rail pressure before the injector starts to receive the signals and the rail pressure after the injection is finished are monitored to change and fluctuate.
The pressure of the common rail pipe is influenced by the oil quantity in and out, when the oil quantity in and out is unequal, rail pressure fluctuation can be caused, and a first-order equation for constructing the common rail system is as follows:
wherein:
in order to determine the system constant, the system is, Qpump the oil quantity is input into the common rail pipe, Q2 the oil output of the common rail pipe is realized. When the system constant is constant, the rail pressure difference is proportional to the oil quantity difference, namely:
ΔP～K(Q pump -Q 2 )
the oil quantity of the input oil quantity of the common rail pipe is the oil supply quantity of the high-pressure oil pump, the output oil quantity of the common rail pipe comprises the oil quantity sprayed into the cylinder and the static leakage quantity of the oil sprayer Q2 Dynamic leakage of fuel injector Q3 . When the high-pressure oil pump is not in operation Qpump Is 0, and when the pulse width signal of the fuel injector is insufficientTo allow the injector to be opened for injector operation, Q1 is a group of a number of 0 s, Q2 and Q3 depending on various parts of the injector such as needle valve, clearance, etc. But the values per unit time may be considered to be the same when the components are all the same, and thus Q 2 ＝ΔtQ f2 ，Q f3 ＝ΔtQ f3 Then the above equation can be simplified as:
ΔP～KΔt(Q f2 +Q f3 )
namely, the rail pressure variable and the time variable are in a direct proportion (delta P-G delta t), wherein delta t is the time before and after the rail pressure monitoring time point, Q f2 Is the static leakage rate, Q, of the injector per unit time f3 Is the dynamic leakage quantity of the fuel injector in unit time.
The rail pressure fluctuations before and after injection can therefore be considered to be proportional to the time difference before and after monitoring.
The first time interval is a time period when the pulse width signal of the current control is not enough to open the fuel injector for fuel injection. During a first time interval, a static leak is present, and a dynamic leak is generated when no fuel is injected but a control signal is sent.
In practical application scenarios, when the pulse width signal is controlled to be sufficient for opening the fuel injector Q3 The dynamic leakage quantity of the fuel injector is suddenly increased and is not in direct proportion to delta t any more because the needle valve starts to inject fuel, and in addition, the needle valve is opened Q1 Instead of 0, the above formula is simplified as:
ΔP＝KΔt(Q f2 +Q f3 )+KQ 1 +KQ e2
wherein Q e2 The dynamic leakage quantity of the fuel injector when the needle valve is opened. And the second rail pressure variation corresponding to the second time interval is the sum of the static leakage quantity, the dynamic leakage quantity and the fuel injection quantity of the second time interval. Therefore, when the rail pressure fluctuation at the time (first time) when the injector starts to inject fuel is compared with the rail pressure fluctuation at the last time when the injector does not inject fuel (first time interval), the change rate of the rail pressure can be obviously seen to change suddenly, the change rate is different from the direct proportion relation with the time variable (duration corresponding to the first time interval) in the first time interval, and the needle is positioned at the position of the needleThe rail pressure fluctuation when the valve is opened presents a nonlinear relation instantaneously.
S102: in response to the first rate of rail pressure change not matching the second rate of rail pressure change, determining a first time.
And the first moment is a corresponding monitoring moment when the first rail pressure change rate is inconsistent with the second rail pressure change rate. According to the step S101, the rail pressure change rate can be suddenly changed when the fuel injector starts to inject fuel, an inflection point appears at a certain moment, and the moment when the inflection point appears at present is determined as the first moment.
In the practical application process, if the time length value corresponding to the current second time interval is too large, when the pulse width signal of the mth oil injector (the time for zero oil mass calibration) is found in the corresponding second time interval, the pulse width of the mth oil injector and the pulse width of the (m-1) th oil injector are divided, the second time interval is divided into n points, and the points with inconsistent track pressure slopes are searched for through the operation among the n points.
In addition, due to the aging effect of the fuel injector, the static leakage amount and the dynamic leakage amount of the fuel injector are changed, but the slopes of the two rail pressure fluctuations calculated by the formula in the S101 are constant, namely the slope of the rail pressure fluctuation in the same time before the fuel injector is aged is different from the slope of the rail pressure fluctuation after the fuel injector is aged, but the slopes of the rail pressure fluctuation are constant, and when the fuel injector starts to inject fuel, the slope of the rail pressure fluctuation has obvious mutation and is inconsistent with the rail pressure change rate. Therefore, the method can find the zero oil quantity calibration time for the fuel injectors with different aging or abrasion degrees without carrying out recalibration threshold values.
And S103, determining the pulse width signal corresponding to the first time from a pulse width signal library.
The pulse width signal library comprises a plurality of time pulse width combinations, pulse width signals of any two time pulse width combinations in the time pulse width combinations are different, and the monitoring time is matched with the pulse width signals. For example, when the monitoring time is 100 microseconds of the pulse width increasing signal, the corresponding pulse width signal is a, and when the monitoring time is 200 microseconds of the pulse width increasing signal, the corresponding pulse width signal is b. The signal strengths of the pulse width signals a and b are different.
In an actual application scene, an Electronic Control Unit (ECU) sends different injector pulse width signals to an injector at different times, the time increment can be selected, the rail pressure fluctuation condition is plotted and displayed in a mode that the pulse width signals are gradually enhanced, the abscissa is the current time for increasing the pulse width signals, and the ordinate is the rail pressure. The time (the abscissa of the inflection point to the inflection point) of the added pulse width signal corresponding to the current rail pressure change rate abrupt change (the first moment) is 200 microseconds, and the intensity of the pulse width signal corresponding to the current moment is inquired from a pulse width signal library through the time.
The electric control unit is an electronic controller for controlling the oil injector to inject oil. The electric control unit sends the pulse width signals of the oil injector to the oil injector at different moments, the different pulse width signals correspond to different pulse width time, the pulse width time is high level time, and effective time of oil injection of the oil injector is tried to be triggered. When the pulse width signal reaches a certain intensity, the oil injection function of the oil injector can be started, and the pulse width time corresponding to the pulse width signal is the zero oil mass calibration time.
S104: and determining that the pulse width time corresponding to the pulse width signal is zero oil volume calibration time.
And the zero oil mass calibration time is the time from the pulse width signal to the fuel injector to start injecting the fuel.
The following describes in detail a method for determining the zero oil calibration time provided in the embodiment of the present application. Referring to fig. 2, fig. 2 is another schematic flow chart of a method for determining a zero oil calibration time according to an embodiment of the present application. The specific process is as follows:
s201: and acquiring pulse width signals of the oil injector at different monitoring moments.
In an actual application scenario, a starting point of a monitoring time, an ending point of the monitoring time, and a time difference between two adjacent monitoring times can be determined according to an actual condition of an oil injector. The approximate interval of the pulse signal sufficient for the injector to start injecting fuel may be determined based on the injector type and historical data, and the starting value of the pulse signal sent by the electronic control unit to the injector and the magnitude of the increase in signal strength may be determined based on this guess. In the acquisition process, there is no restriction on determining the monitoring time or determining the order of the pulse signals.
S202: and storing the monitoring time and the pulse width signal in a correlation manner to obtain the pulse width signal library.
And storing pulse width signals corresponding to different monitoring moments in an associated manner. If the monitoring time is 100 microseconds of the increased pulse width signal, the corresponding pulse width signal is a, and if the monitoring time is 200 microseconds of the increased pulse width signal, the corresponding pulse width signal is b. In an actual application scenario, when the current reading time is 100 microseconds, it can be known that the pulse width signal corresponding to the time is a.
S203: a first rail pressure change rate and a second rail pressure change rate are obtained.
And acquiring a first rail pressure change rate corresponding to the first time interval and a second rail pressure change rate corresponding to the second time interval. The current second time interval is later than the first time interval, and the second time interval is a time period after the oil sprayer starts to spray oil.
S204: in response to the first rate of rail pressure change not matching the second rate of rail pressure change, determining a first time.
And determining that the first rail pressure change rate is different from the second rail pressure change rate, and determining that the corresponding time when the rail pressure change rate changes is the first time.
S205: and determining a pulse width signal corresponding to the first time from a pulse width signal library.
And acquiring a pulse width signal corresponding to the current time from a pulse width signal library according to the first time.
S206: a first base duration is obtained.
And the first basic time length is the basic power-on time length of the fuel injector under the condition of not considering correction.
In an actual application scenario, when calculating the power-on time of an injector, a manufacturer provides an injector power-on time query MAP, where the power-on time query MAP is a basic MAP (without considering corrections such as delay), and a query result is a first basic duration.
S207: and calculating the sum of the first basic time length and the zero oil mass calibration time, and determining the calculation result as the total power-on time length.
And adding the obtained zero oil mass calibration time on the basis of the first basic time length to obtain the final power-on time, namely the total power-on time length.
The foregoing provides some specific implementation manners of the method for determining the zero-oil calibration time for the embodiment of the present application, and based on this, the present application further provides a corresponding device. The device provided by the embodiment of the present application will be described in terms of functional modularity.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a device for determining a zero oil amount calibration time according to an embodiment of the present application.
In this embodiment, the apparatus may include:
the acquiring module 300 is configured to acquire a first rail pressure change rate and a second rail pressure change rate, where the first rail pressure change rate is determined according to a static leakage amount and a dynamic leakage amount of a fuel injector in a first time interval, the second rail pressure change rate is determined according to a static leakage amount and a dynamic leakage amount of the fuel injector in a second time interval, and the first time interval is earlier than the second time interval;
a first time determining module 301, configured to determine a first time in response to a mismatch between the first rail pressure change rate and the second rail pressure change rate, where the first time is a monitoring time corresponding to a case where the first rail pressure change rate is inconsistent with the second rail pressure change rate;
a pulse width signal determining module 302, configured to determine a pulse width signal corresponding to the second time from a pulse width signal library, where the pulse width signal library includes a plurality of pulse width signals, and the plurality of pulse width signals are used for controlling the fuel injector;
and a zero oil mass calibration time determining module 303, configured to determine that the pulse width time corresponding to the pulse width signal is a zero oil mass calibration time, where the zero oil mass calibration time is a time when the pulse width signal is sent to the oil injector to start oil injection.
Optionally, the apparatus further comprises:
the pulse width signal acquisition module is used for acquiring pulse width signals of the oil injector at different monitoring moments;
and the associated storage module is used for storing the monitoring time and the pulse width signal in an associated manner to obtain the pulse width signal library.
Optionally, the first basic duration obtaining module is configured to obtain a first basic duration, where the first basic duration is a basic power-on duration of the fuel injector under a condition that no correction is considered;
and the total power-on time length determining module is used for calculating the sum of the first basic time length and the zero oil mass calibration time and determining the calculation result as the total power-on time length.
Optionally, a first rail pressure variation corresponding to the first time interval is in a direct proportion to a duration of the first time interval.
Optionally, the second rail pressure variation corresponding to the second time interval is the sum of the static leakage amount, the dynamic leakage amount and the fuel injection amount of the second time interval.
The method and the device for determining the zero oil calibration time provided by the application are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. 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 apparatus that comprises the element.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for determining a zero oil calibration time, comprising:
acquiring a first rail pressure change rate and a second rail pressure change rate, wherein the first rail pressure change rate depends on the static leakage amount and the dynamic leakage amount of an oil injector in a first time interval, the second rail pressure change rate depends on the static leakage amount and the dynamic leakage amount of the oil injector in a second time interval, and the first time interval is earlier than the second time interval;
in response to the first rail pressure change rate not matching the second rail pressure change rate, determining a first time, the first time being a monitoring time when the first rail pressure change rate and the second rail pressure change rate are not consistent;
determining a pulse width signal corresponding to the first time from a pulse width signal library, wherein the pulse width signal library comprises a plurality of pulse width signals, and the plurality of pulse width signals are used for controlling the fuel injector;
and determining that the pulse width time corresponding to the pulse width signal is a zero oil mass calibration time, wherein the zero oil mass calibration time is the time from the pulse width signal to the oil sprayer for starting oil injection.
2. The method of claim 1, wherein prior to obtaining the first and second rail pressure change rates, the method further comprises:
acquiring pulse width signals of the oil injector at different monitoring moments;
and associating and storing the monitoring time and the pulse width signal to obtain the pulse width signal library.
3. The method of claim 1, wherein after determining that the pulse width time corresponding to the pulse width signal is zero oil volume calibration time, the method further comprises:
acquiring a first basic time length, wherein the first basic time length is the basic power-on time length of the oil sprayer under the condition of not considering correction;
and calculating the sum of the first basic time length and the zero oil mass calibration time, and determining the calculation result as the total power-on time length.
4. The method of claim 1, wherein a first rail pressure change amount corresponding to the first time interval is in a direct proportion to a duration of the first time interval.
5. The method of claim 1, wherein the second rail pressure variation corresponding to the second time interval is a sum of a static leakage amount, a dynamic leakage amount, and an oil injection amount of the second time interval.
6. A zero fuel calibration time determination apparatus, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first rail pressure change rate and a second rail pressure change rate, the first rail pressure change rate depends on the static leakage quantity and the dynamic leakage quantity of an oil sprayer in a first time interval, the second rail pressure change rate depends on the static leakage quantity and the dynamic leakage quantity of the oil sprayer in a second time interval, and the first time interval is earlier than the second time interval;
a first time determination module, configured to determine a first time in response to a mismatch between the first rail pressure change rate and the second rail pressure change rate, where the first time is a monitoring time when the first rail pressure change rate and the second rail pressure change rate are inconsistent;
the pulse width signal determining module is used for determining a pulse width signal corresponding to the first moment from a pulse width signal library, wherein the pulse width signal library comprises a plurality of pulse width signals, and the plurality of pulse width signals are used for controlling the fuel injector;
and the zero oil mass calibration time determining module is used for determining that the pulse width time corresponding to the pulse width signal is the zero oil mass calibration time, and the zero oil mass calibration time is the time from the pulse width signal to the oil sprayer to start oil injection.
7. The apparatus of claim 6, further comprising:
the pulse width signal acquisition module is used for acquiring pulse width signals of the oil injector at different monitoring moments;
and the associated storage module is used for storing the monitoring time and the pulse width signal in an associated manner to obtain the pulse width signal library.
8. The apparatus of claim 6, further comprising:
the first basic time length obtaining module is used for obtaining a first basic time length, and the first basic time length is the basic power-on time length of the oil sprayer under the condition that correction is not considered;
and the total power-on time length determining module is used for calculating the sum of the first basic time length and the zero oil mass calibration time and determining the calculation result as the total power-on time length.
9. The apparatus of claim 6, wherein a first rail pressure change amount corresponding to the first time interval is in a direct proportion to a duration of the first time interval.
10. The apparatus of claim 6, wherein the second rail pressure variation corresponding to the second time interval is a sum of a static leakage amount, a dynamic leakage amount, and an oil injection amount of the second time interval.
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