CN112682199A - Rail pressure control method and device for vehicle - Google Patents
Rail pressure control method and device for vehicle Download PDFInfo
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- CN112682199A CN112682199A CN202011573286.4A CN202011573286A CN112682199A CN 112682199 A CN112682199 A CN 112682199A CN 202011573286 A CN202011573286 A CN 202011573286A CN 112682199 A CN112682199 A CN 112682199A
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Abstract
The application provides a rail pressure control method and a rail pressure control device for a vehicle, wherein the method comprises the following steps: when an engine of a vehicle is started, a reference time length prestored in a memory of the vehicle is obtained, the current oil demand value of the vehicle is determined according to the reference time length and the preset oil demand value of the vehicle, the rail pressure of the vehicle is established according to the current oil demand, if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, a first time length from the time when the engine is started to the first time is obtained, the first time is the time when the rail pressure of the vehicle is determined to be greater than the minimum allowable rail pressure of the vehicle, the reference time length in the memory is updated according to the first time length, and the updated reference time length is used for correcting the oil demand value of the vehicle when the vehicle is started next time. The method can quickly establish the rail pressure when the vehicle is started.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a rail pressure control method and device of a vehicle.
Background
The high-pressure common rail fuel injection technology is one of the key technologies for energy conservation and emission reduction of the diesel engine for the vehicle, the common rail fuel pressure in a high-pressure common rail system not only determines the atomization degree of fuel, but also is an important metering parameter of fuel injection quantity, and the stability and dynamic response of rail pressure control directly influence the performance of each working condition of the engine.
Currently, when an engine is started, an Electronic Control Unit (ECU) is responsible for rail pressure Control, and the ECU establishes rail pressure with a fixed required oil amount through an oil amount metering Unit. In the case of severe environmental conditions or low working efficiency of the oil amount metering unit, the rail pressure may be slowly built in the rail pressure building process, so that the engine is slowly started and even the engine is difficult to start.
Disclosure of Invention
The application provides a rail pressure control method and device of a vehicle to quickly establish rail pressure when starting an engine of the vehicle.
In a first aspect, the present application provides a rail pressure control method of a vehicle, comprising:
when starting an engine of a vehicle, a reference time period stored in advance in a memory of the vehicle is acquired.
And determining the current required oil quantity value of the vehicle according to the reference time length and the preset required oil quantity value of the vehicle.
And establishing the rail pressure of the vehicle according to the current oil demand.
If the rail pressure of the vehicle is smaller than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, a first time length from the time when the engine is started to a first time is obtained, and the first time is the time when the rail pressure of the vehicle is determined to be larger than the minimum allowable rail pressure of the vehicle.
And updating the reference time length in the memory according to the first time length, wherein the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle is started next time.
Optionally, determining the current required oil quantity value of the vehicle according to the reference time length and the preset required oil quantity value of the vehicle, including:
and determining a target correction oil quantity value corresponding to the reference time length according to the preset corresponding relation between the time length and the correction oil quantity value. And determining the current required oil quantity value of the vehicle according to the target correction oil quantity value and the preset required oil quantity value of the vehicle.
Optionally, updating the reference duration in the memory according to the first duration includes:
acquiring a sum of the reference time length and the first time length; and determining the updated reference time length according to the sum value.
Optionally, the rail pressure control method of the vehicle further includes:
and if the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring the reference times pre-stored in a memory of the vehicle. And accumulating the reference times for a first preset time, and updating the reference duration in the memory according to the accumulated reference times.
Optionally, updating the reference duration in the memory according to the accumulated reference times includes:
if the accumulated reference times are larger than the first time threshold, acquiring a difference value between the reference time length in the memory and a first preset time length, and determining the updated reference time length according to the difference value.
Optionally, updating the reference duration in the memory according to the accumulated reference times, further comprising:
and if the accumulated reference times are larger than the second time threshold, setting the value of the reference time length in the memory as a second preset time length to obtain the updated reference time length. Wherein the first fractional threshold is less than the second fractional threshold.
Optionally, the rail pressure control method of the vehicle further includes:
and if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, updating the value of the reference times in the memory to a second preset time.
Optionally, the memory is a read-only memory.
In a second aspect, the present application provides a rail pressure control apparatus of a vehicle, comprising:
the vehicle control device includes an acquisition module for acquiring a reference time period stored in a memory of a vehicle in advance when an engine of the vehicle is started.
And the determining module is used for determining the current oil demand value of the vehicle according to the reference time length and the preset oil demand value of the vehicle.
And the establishing module is used for establishing the rail pressure of the vehicle according to the current oil quantity demand.
The obtaining module is further used for obtaining a first time length from the time when the engine is started to a first time when the rail pressure of the vehicle is determined to be smaller than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, wherein the first time is the time when the rail pressure of the vehicle is determined to be larger than the minimum allowable rail pressure of the vehicle.
And the processing module is used for updating the reference time length in the memory according to the first time length, and the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle is started next time.
Optionally, the determining module is specifically configured to:
and determining a target correction oil quantity value corresponding to the reference time length according to the preset corresponding relation between the time length and the correction oil quantity value. And determining the current required oil quantity value of the vehicle according to the target correction oil quantity value and the preset required oil quantity value of the vehicle.
Optionally, the processing module is specifically configured to:
and acquiring a sum of the reference duration and the first duration, and determining the updated reference duration according to the sum.
Optionally, the obtaining module is further configured to:
and if the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring the reference times pre-stored in a memory of the vehicle.
The processing module is specifically configured to:
and accumulating the reference times for a first preset time, and updating the reference duration in the memory according to the accumulated reference times.
Optionally, the processing module is specifically configured to:
if the accumulated reference times are larger than the first time threshold, acquiring a difference value between the reference time length in the memory and a first preset time length, and determining the updated reference time length according to the difference value.
Optionally, the processing module is further configured to:
and if the accumulated reference times are larger than the second time threshold, setting the value of the reference time length in the memory as a second preset time length to obtain the updated reference time length. Wherein the first fractional threshold is less than the second fractional threshold.
Optionally, the processing module is further configured to:
and if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, updating the value of the reference times in the memory to a second preset time.
Optionally, the memory is a read-only memory.
In a third aspect, the present application provides a rail pressure control apparatus for a vehicle, comprising: a memory and a processor.
The memory is for storing program instructions.
The processor is configured to invoke the program instructions in the memory to perform the rail pressure control method of the vehicle as described in the first aspect of the present application.
In a fourth aspect, the present application provides a vehicle comprising: an engine, a plurality of cylinders, and a rail pressure control apparatus of a vehicle according to the second or third aspect.
In a fifth aspect, the present application provides a computer readable storage medium having stored thereon computer program instructions which, when executed, implement a rail pressure control method of a vehicle as described in the first aspect of the present application.
In a sixth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements a rail pressure control method of a vehicle as described in the first aspect of the present application.
The rail pressure control method and device for the vehicle are characterized in that when an engine of the vehicle is started, a reference time length pre-stored in a memory of the vehicle is obtained, the current required oil quantity value of the vehicle is determined according to the reference time length and the preset required oil quantity value of the vehicle, the rail pressure of the vehicle is established according to the current required oil quantity, if the rail pressure of the vehicle is smaller than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, a first time length from the time when the engine is started to the first time is obtained, the first time is the time when the rail pressure of the vehicle is determined to be larger than the minimum allowable rail pressure of the vehicle, the reference time length in the memory is updated according to the first time length, and the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle. Because this application can be according to the demand oil mass that the vehicle started of rail pressure foundation time correction, establish the rail pressure of vehicle according to the demand oil mass after the correction, consequently, can establish rail pressure when the vehicle starts fast, when guaranteeing that the vehicle engine can start, accelerated the start of engine.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;
FIG. 2 is a flow chart of a rail pressure control method for a vehicle according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a rail pressure control method for a vehicle according to another embodiment of the present disclosure;
FIG. 4 is a flow chart of a rail pressure control method for a vehicle according to another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a rail pressure control device of a vehicle according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a rail pressure control device of a vehicle according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all 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.
The high-pressure common rail fuel injection technology is one of the key technologies for energy conservation and emission reduction of the diesel engine for the vehicle, the common rail fuel pressure in a high-pressure common rail system not only determines the atomization degree of fuel, but also is an important metering parameter of fuel injection quantity, and the stability and dynamic response of rail pressure control directly influence the performance of each working condition of the engine.
At present, when an engine is started, an ECU is responsible for rail pressure control, and the ECU establishes rail pressure through an oil quantity metering unit according to a fixed required oil quantity. In the case of severe environmental conditions or low working efficiency of the oil amount metering unit, the rail pressure may be slowly built in the rail pressure building process, so that the engine is slowly started and even the engine is difficult to start.
Therefore, the rail pressure control method and the rail pressure control device for the vehicle correct the oil quantity required by starting the engine according to the rail pressure establishing time when the engine is started, and quickly establish the rail pressure so as to start the engine as soon as possible.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application, as shown in fig. 1, a fuel quantity metering unit 100 is controlled to control a fuel quantity of fuel in a fuel tank 101 entering a high-pressure fuel pump 103 through a fuel pipe 102, the high-pressure fuel pump 103 is pressurized and then delivered to a high-pressure common rail pipe 104, and an ECU105 collects a signal of a rail pressure sensor 106, a signal of a crankshaft rotation speed sensor 107, and a signal of a camshaft rotation speed sensor 108. When the ECU determines the compression top dead center position of each cylinder 110 according to the signal of the crankshaft rotation speed sensor 107 and the signal of the camshaft rotation speed sensor 108, the rail pressure obtained according to the signal of the rail pressure sensor 106 is greater than the minimum allowable rail pressure, and then fuel is controlled to be injected into the cylinder 110 (a plurality of cylinders, each cylinder corresponds to an injector in one-to-one correspondence) through the injector 109 (a plurality of injectors are shown in fig. 1) to be combusted and applied with work, so that the engine is driven to operate, and the vehicle is started. The specific implementation process of the vehicle rail pressure establishment can be seen in the schemes of the following embodiments.
Fig. 2 is a flowchart of a rail pressure control method of a vehicle according to an embodiment of the present disclosure, where the method of the present embodiment may be applied to a vehicle. As shown in fig. 2, the method of the present embodiment includes:
s201, when an engine of the vehicle is started, a reference time length pre-stored in a memory of the vehicle is obtained.
In the present embodiment, the reference time period has been stored in advance in the memory of the vehicle, and therefore, the reference time period stored in advance in the memory of the vehicle is acquired when the engine of the vehicle is started. Specifically, the reference time period prestored in the memory of the vehicle at the time of starting the engine of the vehicle for the first time is, for example, 0, and the reference time periods prestored in the memory of the vehicle at the time of starting the engine of the vehicle for the second time and a plurality of subsequent times are both the reference time periods stored at the time of last starting the engine of the vehicle.
Optionally, the memory is a read-only memory.
In the embodiment, the memory is a read-only memory, and can still store data after the vehicle is powered off, so that the data cannot be lost. The read-only memory is for example: a charged Erasable Programmable Read Only Memory (EEPROM), or a Programmable Read Only Memory (PROM), or an Erasable Programmable Read Only Memory (EPROM). When a power switch of the vehicle is powered down, the reference time period is stored in the read only memory. The next time the vehicle is started, it is ensured that the reference time period can be read from the read-only memory.
S202, determining the current oil demand value of the vehicle according to the reference time length and the preset oil demand value of the vehicle.
In the embodiment, the reference time period and the preset required oil amount value of the vehicle have been obtained, wherein the preset required oil amount value of the vehicle is a fixed oil amount value, for example 10000 cubic millimeters per second. Therefore, the current required oil quantity value of the vehicle is determined according to the reference time length and the preset required oil quantity value of the vehicle.
And S203, establishing the rail pressure of the vehicle according to the current oil demand.
In this embodiment, the current required fuel amount value of the vehicle has been obtained, and therefore, the rail pressure of the vehicle is established according to the current required fuel amount. After the rail pressure of the vehicle is established, the ECU controls the fuel injector to inject fuel into the cylinder to burn and apply work, so that the engine is driven to operate, and the vehicle is started.
S204, if the rail pressure of the vehicle is smaller than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring a first time length from the time when the engine is started to a first time, wherein the first time is the time when the rail pressure of the vehicle is determined to be larger than the minimum allowable rail pressure of the vehicle.
In the embodiment, specifically, the ECU determines the compression top dead center position of each cylinder by a crankshaft rotation speed sensor signal and a camshaft rotation speed sensor signal, and obtains the rail pressure of the vehicle by a rail pressure sensor signal. The minimum allowable rail pressure of the vehicle is an experimentally calibrated value, for example 200 bar. If the ECU determines that the compression top dead center position of each cylinder of the vehicle (namely, a synchronous signal exists), the rail pressure of the vehicle obtained through the rail pressure sensor signal is less than or equal to the minimum allowable rail pressure of the vehicle, a first time length from the time when the engine is started to a first time is obtained, wherein the time when the engine is started is the time when the engine rotating speed is 0, and the first time is the time when the current rail pressure of the vehicle is determined to be greater than the minimum allowable rail pressure of the vehicle. For example: the speed of the engine is denoted by n, the rail pressure by p, and pminIndicating minimum rail pressure, by tiRepresenting the first time length, calculating the time when the rotating speed n is changed from 0 to more than 0 until the rail pressure p is more than pminIs a first duration ti。
And S205, updating the reference time length in the memory according to the first time length, wherein the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle is started next time.
In the present embodiment, the first time length and the reference time length in the memory have been obtained, and therefore, the reference time length in the memory is updated according to the first time length, and the updated reference time length is used to correct the required fuel amount value of the vehicle when the vehicle is started next time.
Optionally, a sum of the reference duration and the first duration is obtained, and the updated reference duration is determined according to the sum.
In the present embodiment, the reference duration and the first duration have already been obtained, and therefore, the sum of the reference duration and the first duration is equal to the updated reference duration.
On the basis of the above-described embodiment, the actions corresponding to the above steps S201 to S205 may be continuously performed when the engine of the vehicle is started next time.
The rail pressure control method of the vehicle comprises the steps of obtaining a reference time length stored in a memory of the vehicle in advance when an engine of the vehicle is started, determining a current required oil quantity value of the vehicle according to the reference time length and a preset required oil quantity value of the vehicle, establishing rail pressure of the vehicle according to the current required oil quantity, obtaining a first time length from the moment when the engine is started to a first moment when the rail pressure of the vehicle is less than or equal to the minimum allowed rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, updating the reference time length in the memory according to the first time length when the rail pressure of the vehicle is determined to be greater than the minimum allowed rail pressure of the vehicle, and using the updated reference time length to correct the required oil quantity value of the vehicle when the vehicle is started next time. Because this application can be according to the demand oil mass that the vehicle started of rail pressure foundation time correction, establish the rail pressure of vehicle according to the demand oil mass after the correction, consequently, can establish rail pressure when the vehicle starts fast, when guaranteeing that the vehicle engine can start, accelerated the start of engine.
On the basis of the embodiment shown in fig. 2, in some embodiments, fig. 3 is a flowchart of a rail pressure control method of a vehicle according to another embodiment of the present application, and as shown in fig. 3, the method of the present embodiment includes:
s301, when an engine of the vehicle is started, a reference time length stored in a memory of the vehicle in advance is obtained.
In this embodiment, the specific implementation process of S301 may refer to the related description of the embodiment shown in fig. 2, and is not described herein again.
S302, determining a target correction oil quantity value corresponding to the reference time length according to a preset corresponding relation between the time length and the correction oil quantity value.
In this embodiment, a preset correspondence between the duration and the correction oil amount value has been determined, and the preset correspondence is an experimental calibration value of the relationship between the duration and the correction oil amount value. For example: table 1 shows an example of the preset correspondence relationship between the time length and the correction oil amount value, and as shown in table 1, when the time length is 0, the correction oil amount value is 0, and when the time length is 100 milliseconds, the correction oil amount value is 1000 cubic millimeters per second. Therefore, according to the obtained reference duration, the preset corresponding relation is checked, and the target correction oil quantity value corresponding to the reference duration is determined. And for the reference duration being a value not less than 0, when the preset corresponding relation between the duration and the correction oil quantity value is inquired according to the reference duration, the obtained correction oil quantity value corresponding to the reference duration cannot exceed the maximum boundary value of the correction oil quantity value. For example: in table 1, the corresponding correction oil amount value is still 8000 cubic mm/sec when the reference time period is longer than 1000 msec.
TABLE 1 example of preset correspondence between duration and correction oil amount value
| Time length (millisecond) | 0 | 100 | 500 | 1000 |
| Correction oil quantity value (cubic millimeter/second) | 0 | 1000 | 5000 | 8000 |
And S303, determining the current required oil quantity value of the vehicle according to the target correction oil quantity value and the preset required oil quantity value of the vehicle.
In the present embodiment, the target correction oil amount value and the preset required oil amount value of the vehicle have been obtained, wherein the preset required oil amount value of the vehicle is a fixed oil amount value, for example 10000 cubic millimeters per second, and therefore, the sum of the target correction oil amount value and the preset required oil amount value of the vehicle is equal to the current required oil amount value of the vehicle, and the rail pressure is quickly established by increasing the starting oil amount of the vehicle.
And S304, establishing the rail pressure of the vehicle according to the current oil demand.
S305, if the rail pressure of the vehicle is smaller than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring a first time length from the time when the engine is started to a first time, wherein the first time is the time when the rail pressure of the vehicle is determined to be larger than the minimum allowable rail pressure of the vehicle.
And S306, updating the reference time length in the memory according to the first time length, wherein the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle is started next time.
In this embodiment, the specific implementation processes of S304, S305, and S306 may refer to the related description of the embodiment shown in fig. 2, and are not described herein again.
And S307, if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, updating the reference frequency value in the memory to a second preset frequency.
In this embodiment, specifically, the second preset number is, for example, 0. If the ECU determines that the compression top dead center position of each cylinder of the vehicle (namely, a synchronous signal exists), the rail pressure of the vehicle obtained through the rail pressure sensor signal is less than or equal to the minimum allowable rail pressure of the vehicle, and the value of the reference frequency in the memory is updated to be 0.
It should be noted that the execution sequence of S305, S306 and S307 is not limited.
S308, if the rail pressure of the vehicle is larger than the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring the reference times pre-stored in a memory of the vehicle, accumulating the reference times for a first preset time, and updating the reference time length in the memory according to the accumulated reference times.
In the present embodiment, specifically, the first preset number of times is, for example, 1, and the reference number of times stored in advance in the memory of the vehicle is 0 when the engine of the vehicle is started for the first time. The memory is, for example, an EEPROM, and the reference time period is stored in the EEPROM when the power switch of the vehicle is powered down. The reference time period may be read from the EEPROM the next time the vehicle is started. If the ECU determines the compression top dead center position of each cylinder of the vehicle (namely, a synchronous signal exists), the rail pressure of the vehicle obtained through the rail pressure sensor signal is greater than the minimum allowable rail pressure of the vehicle, the reference times pre-stored in a memory of the vehicle are obtained, and the reference times are accumulated for a first preset time. And updating the reference time length in the memory according to the accumulated reference times.
Optionally, if the accumulated reference number is greater than the first time threshold, a difference between the reference time length in the memory and a first preset time length is obtained, and the updated reference time length is determined according to the difference.
In this embodiment, specifically, the first time threshold is, for example, 2 times and is an experimental calibration value, and the first preset time duration is, for example, 1 second and is an experimental calibration value. For example: and NUM is used for representing the accumulated reference times, NUM1 is used for representing the first time threshold, Ti1 is used for representing the reference time length in the memory, and delta Ti is used for representing the first preset time length, if NUM > NUM1, the delta Ti is subtracted from Ti1, and the updated reference time length Ti1 is obtained.
Optionally, if the accumulated reference number is greater than the second time threshold, the value of the reference duration in the memory is set to a second preset duration to obtain an updated reference duration, where the first time threshold is smaller than the second time threshold.
In this embodiment, specifically, the second time threshold is, for example, 5 times and is an experimental calibration value, the second preset time length is, for example, 0, and the first time threshold is smaller than the second time threshold. For example: the accumulated reference times are represented by NUM, the second time threshold is represented by NUM2, and the reference time length in the memory is represented by Ti1, so that if NUM > NUM2, Ti1 is cleared, and the updated reference time length Ti1 is obtained as 0, and therefore, the vehicle start required oil amount does not need to be corrected.
On the basis of the above-described embodiment, the actions corresponding to the above steps S301 to S308 may be continuously performed when the engine of the vehicle is started next time.
The rail pressure control method of the vehicle can correct the required oil quantity of the vehicle starting according to the rail pressure establishing time, the rail pressure of the vehicle is established according to the corrected required oil quantity, and the required oil quantity of the vehicle starting is not corrected when the rail pressure working condition of the vehicle is kept good.
On the basis of the embodiment shown in fig. 3, in some embodiments, fig. 4 is a flowchart of a rail pressure control method of a vehicle according to another embodiment of the present application, and as shown in fig. 4, the method of the present embodiment includes:
s401, when an engine of the vehicle is started, Ti1 and NUM which are stored in a memory of the vehicle in advance are obtained, wherein Ti1 represents reference time length, and NUM represents reference times.
S402, determining dvol corresponding to Ti1 according to the preset corresponding relation between the duration and the corrected oil quantity valueTargetWherein, dvolTargetRepresenting the target corrected oil amount value.
S403, according to dvolTargetAnd dvol, determining dvolAt presentNamely: dvolAt present＝dvol+dvolTargetWherein dvol represents a preset demanded oil amount value of the vehicle, dvolAt presentRepresenting the current demanded fuel quantity value of the vehicle.
S404, according to dvolAt presentEstablishing a rail pressure p of the vehicle, wherein p represents the rail pressure of the vehicle.
S405, judging whether p is larger than p when the compression top dead center position of each cylinder of the vehicle is determinedminWherein p isminIndicating the minimum allowable rail pressure of the vehicle.
S406, acquiring the time when the engine speed n is changed from 0 to more than 0 until the rail pressure p is more than pminOf time tiNUM is updated to 0, where tiA first period of time between a time when the engine is started and a first time when it is determined that the rail pressure of the vehicle is greater than a minimum allowable rail pressure of the vehicle is indicated.
S407, according to tiUpdate Ti1, i.e.: ti1 ═ Ti1+ ti。
And S408, accumulating NUM by 1, wherein 1 represents an example value of the first preset times.
S409, judging whether NUM is larger than NUM1, wherein NUM1 represents a first time threshold value.
S410, obtaining a difference value between Ti1 and Δ Ti in the memory, and determining an updated Ti1 according to the difference value, namely: ti1 ═ Ti1- Δ Ti, where Δ Ti represents the first preset time period.
S411, judging whether NUM is larger than NUM2, wherein NUM2 represents a second time threshold value.
S412, setting the value of Ti1 to 0, namely: ti1 is equal to 0, and the updated reference duration Ti1 is obtained.
And S413, when the power switch of the vehicle is powered off, storing the updated Ti1 and NUM in the memory of the vehicle.
In this embodiment, the specific implementation process of S401 to S413 may refer to the related description of the embodiment shown in fig. 2 or fig. 3, and is not described herein again.
The rail pressure control method of the vehicle can correct the required oil quantity of the vehicle starting according to the rail pressure establishing time, the rail pressure of the vehicle is established according to the corrected required oil quantity, and the required oil quantity of the vehicle starting is not corrected when the rail pressure working condition of the vehicle is kept good.
Fig. 5 is a schematic structural diagram of a rail pressure control device of a vehicle according to an embodiment of the present application, and as shown in fig. 5, a rail pressure control device 500 of a vehicle according to the present embodiment includes: the system comprises an acquisition module 501, a determination module 502, a building module 503 and a processing module 504.
An obtaining module 501, configured to obtain a reference time period pre-stored in a memory of a vehicle when an engine of the vehicle is started;
the determining module 502 is configured to determine a current required oil amount value of the vehicle according to the reference time length and a preset required oil amount value of the vehicle;
the establishing module 503 is used for establishing the rail pressure of the vehicle according to the current oil demand;
the obtaining module 501 is further configured to obtain a first time period from a time when the engine is started to a first time when the rail pressure of the vehicle is determined to be less than or equal to a minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, where the first time period is a time when the rail pressure of the vehicle is determined to be greater than the minimum allowable rail pressure of the vehicle;
and the processing module 504 is configured to update the reference time length in the memory according to the first time length, where the updated reference time length is used for correcting the required fuel amount value of the vehicle when the vehicle is started next time.
On the basis of any of the embodiments shown above, the determining module 502 is specifically configured to:
determining a target correction oil quantity value corresponding to the reference time length according to a preset corresponding relation between the time length and the correction oil quantity value; and determining the current required oil quantity value of the vehicle according to the target correction oil quantity value and the preset required oil quantity value of the vehicle.
On the basis of any of the above-described embodiments, the processing module 504 is specifically configured to:
acquiring a sum of the reference time length and the first time length; and determining the updated reference time length according to the sum value.
On the basis of any one of the above illustrated embodiments, the obtaining module 501 is further configured to:
and if the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring the reference times pre-stored in a memory of the vehicle.
The processing module 504 is specifically configured to:
accumulating the reference times by a first preset time; and updating the reference time length in the memory according to the accumulated reference times.
On the basis of any of the above-described embodiments, the processing module 504 is specifically configured to:
if the accumulated reference times are larger than the first time threshold, acquiring a difference value between the reference time length in the memory and a first preset time length, and determining the updated reference time length according to the difference value.
On the basis of any of the above illustrated embodiments, the processing module 504 is further configured to:
if the accumulated reference times are larger than the second time threshold, setting the value of the reference time length in the memory as a second preset time length to obtain an updated reference time length;
wherein the first fractional threshold is less than the second fractional threshold.
On the basis of any of the above illustrated embodiments, the processing module 504 is further configured to:
and if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, updating the value of the reference times in the memory to a second preset time.
On the basis of any of the above-described embodiments, the memory is a read-only memory.
The apparatus of this embodiment may be configured to implement the technical solution of any one of the above-mentioned method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 6 is a schematic structural diagram of a rail pressure control device of a vehicle according to another embodiment of the present application, and as shown in fig. 6, a rail pressure control device 600 of a vehicle according to this embodiment includes: one or more memories 601 and a processor 602. The memory 601 and the processor 602 are connected by a bus.
The memory 601 is used to store program instructions.
acquiring a reference time length prestored in a memory of a vehicle when an engine of the vehicle is started; determining the current required oil quantity value of the vehicle according to the reference time length and the preset required oil quantity value of the vehicle; establishing rail pressure of the vehicle according to the current oil demand; if the rail pressure of the vehicle is smaller than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring a first time length from the moment when the engine is started to a first moment, wherein the first moment is the moment when the rail pressure of the vehicle is determined to be larger than the minimum allowable rail pressure of the vehicle; and updating the reference time length in the memory according to the first time length, wherein the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle is started next time.
On the basis of any of the above-described embodiments, the processor 602 is specifically configured to:
determining a target correction oil quantity value corresponding to the reference time length according to a preset corresponding relation between the time length and the correction oil quantity value; and determining the current required oil quantity value of the vehicle according to the target correction oil quantity value and the preset required oil quantity value of the vehicle.
On the basis of any of the above-described embodiments, the processor 602 is specifically configured to:
acquiring a sum of the reference time length and the first time length; and determining the updated reference time length according to the sum value.
On the basis of any of the illustrated embodiments, the processor 602 is further configured to:
if the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring the reference times pre-stored in a memory of the vehicle; accumulating the reference times by a first preset time; and updating the reference time length in the memory according to the accumulated reference times.
On the basis of any of the above-described embodiments, the processor 602 is specifically configured to:
if the accumulated reference times are larger than the first time threshold, acquiring a difference value between the reference time length in the memory and a first preset time length, and determining the updated reference time length according to the difference value.
On the basis of any of the illustrated embodiments, the processor 602 is further configured to:
if the accumulated reference times are larger than the second time threshold, setting the value of the reference time length in the memory as a second preset time length to obtain an updated reference time length;
wherein the first fractional threshold is less than the second fractional threshold.
On the basis of any of the illustrated embodiments, the processor 602 is further configured to:
and if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, updating the value of the reference times in the memory to a second preset time.
On the basis of any of the above-described embodiments, the memory is a read-only memory.
Optionally, the memory for storing the reference time length and/or the reference times and the memory for storing the program instructions may be the same memory or different memories.
The apparatus of this embodiment may be configured to implement the technical solution of any one of the above-mentioned method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the present application, and as shown in fig. 7, a vehicle 700 according to this embodiment includes: the engine 710, the plurality of cylinders 720, and the rail pressure control device 730 of the vehicle may correspondingly execute the technical solutions of any one of the method embodiments in fig. 2 to 4, and the implementation principles and technical effects thereof are similar and will not be described herein again.
The present application also provides a computer program product comprising a computer program which, when executed by a processor, implements aspects of the rail pressure control method of a vehicle as above.
The application also provides a computer-readable storage medium, wherein computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the scheme of the rail pressure control method of the vehicle is realized.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in a rail pressure control device of a vehicle.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (13)
1. A rail pressure control method of a vehicle, characterized by comprising:
acquiring a reference time length prestored in a memory of a vehicle when an engine of the vehicle is started;
determining the current required oil quantity value of the vehicle according to the reference time length and the preset required oil quantity value of the vehicle;
establishing rail pressure of the vehicle according to the current oil demand;
if the rail pressure of the vehicle is smaller than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring a first time length from the time when the engine is started to a first time, wherein the first time is the time when the rail pressure of the vehicle is determined to be larger than the minimum allowable rail pressure of the vehicle;
and updating the reference time length in the memory according to the first time length, wherein the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle is started next time.
2. The method of claim 1, wherein determining the current required oil amount value of the vehicle according to the reference time period and the preset required oil amount value of the vehicle comprises:
determining a target correction oil quantity value corresponding to the reference time length according to a preset corresponding relation between the time length and the correction oil quantity value;
and determining the current required oil quantity value of the vehicle according to the target correction oil quantity value and the preset required oil quantity value of the vehicle.
3. The method of claim 1, wherein updating the reference duration in the memory according to the first duration comprises:
acquiring a sum of the reference time length and the first time length;
and determining the updated reference time length according to the sum.
4. The method of claim 1, further comprising:
if the rail pressure of the vehicle is larger than the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, acquiring the reference times pre-stored in a memory of the vehicle;
accumulating the reference times by a first preset time;
and updating the reference time length in the memory according to the accumulated reference times.
5. The method of claim 4, wherein updating the reference duration in the memory according to the accumulated reference times comprises:
if the accumulated reference times are larger than a first time threshold, acquiring a difference value between the reference time length in the memory and a first preset time length, and determining the updated reference time length according to the difference value.
6. The method of claim 5, wherein updating the reference duration in the memory according to the accumulated reference times further comprises:
if the accumulated reference times are larger than a second time threshold, setting the value of the reference time length in the memory as a second preset time length to obtain an updated reference time length;
wherein the first secondary number threshold is less than the second secondary number threshold.
7. The method of claim 6, further comprising:
and if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, updating the value of the reference times in the memory to a second preset time.
8. The method of any of claims 1-7, wherein the memory is a read-only memory.
9. A rail pressure control apparatus of a vehicle, characterized by comprising:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a reference time length which is stored in advance in a storage of a vehicle when an engine of the vehicle is started;
the determining module is used for determining the current required oil quantity value of the vehicle according to the reference time length and the preset required oil quantity value of the vehicle;
the establishing module is used for establishing the rail pressure of the vehicle according to the current oil demand;
the acquisition module is further used for acquiring a first time length from the moment when the engine is started to a first moment if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when the compression top dead center position of each cylinder of the vehicle is determined, wherein the first moment is the moment when the rail pressure of the vehicle is determined to be greater than the minimum allowable rail pressure of the vehicle;
and the processing module is used for updating the reference time length in the memory according to the first time length, and the updated reference time length is used for correcting the required oil quantity value of the vehicle when the vehicle is started next time.
10. A rail pressure control apparatus of a vehicle, characterized by comprising: a memory and a processor;
the memory is to store program instructions;
the processor is configured to invoke the program instructions in the memory to perform the rail pressure control method of the vehicle of any of claims 1-8.
11. A vehicle, characterized by comprising: an engine, a plurality of cylinders, a rail pressure control apparatus of a vehicle according to claim 9 or 10.
12. A computer-readable storage medium, characterized in that computer program instructions are stored therein, which when executed, implement a rail pressure control method of a vehicle according to any one of claims 1 to 8.
13. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, carries out the rail pressure control method of a vehicle according to any one of claims 1-8.
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