CN112682199B - Vehicle rail pressure control method and device - Google Patents

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

Vehicle rail pressure control method and device

technical field

The present application relates to the field of vehicle technology, in particular to a method and device for controlling rail pressure of a vehicle.

Background technique

High pressure common rail fuel injection technology is one of the key technologies for energy saving and emission reduction of vehicle diesel engines. Stability and dynamic response directly affect the performance of the engine in each working condition.

At present, when the engine is started, the Electronic Control Unit (ECU) is responsible for the rail pressure control, and the ECU establishes the rail pressure through the oil metering unit with a fixed required oil amount. In the case of harsh environmental conditions or low working efficiency of the fuel quantity metering unit, the rail pressure may be slow to build up in the above process of building up the rail pressure, which may cause the engine to start slowly or even difficult to start.

Contents of the invention

The present application provides a rail pressure control method and device for a vehicle, so as to quickly establish rail pressure when starting the engine of the vehicle.

In a first aspect, the present application provides a rail pressure control method of a vehicle, including:

When starting the engine of the vehicle, the reference duration stored in the memory of the vehicle is acquired.

According to the reference time length and the preset fuel demand value of the vehicle, the current fuel demand value of the vehicle is determined.

According to the current oil demand, the rail pressure of the vehicle is established.

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, the first time period between the moment when the engine is started and the first moment is obtained. The moment when the rail pressure is greater than the minimum allowable rail pressure of the vehicle.

According to the first time length, the reference time length in the memory is updated, and the updated reference time length is used to correct the fuel demand value of the vehicle when the vehicle is started next time.

Optionally, according to the reference duration and the preset required fuel value of the vehicle, determine the current required fuel value of the vehicle, including:

According to the preset corresponding relationship between the time length and the corrected oil volume value, the target corrected oil volume value corresponding to the reference time length is determined. According to the target corrected fuel quantity value and the preset required fuel quantity value of the vehicle, the current required fuel quantity value of the vehicle is determined.

Optionally, according to the first duration, the reference duration in the memory is updated, including:

Obtain the sum of the reference duration and the first duration; determine the updated reference duration according to the sum.

Optionally, the rail pressure control method of the vehicle also includes:

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, the reference number pre-stored in the memory of the vehicle is acquired. The reference count is added to the first preset count, and the reference duration in the memory is updated according to the accumulated reference count.

Optionally, update the reference duration in the memory according to the accumulated reference times, including:

If the accumulated reference times are greater than the first number threshold, the difference between the reference duration in the memory and the first preset duration is acquired, and an updated reference duration is determined according to the difference.

Optionally, updating the reference duration in the memory according to the accumulated reference times also includes:

If the accumulated reference times are greater than the second times threshold, the value of the reference duration in the memory is set as the second preset duration to obtain an updated reference duration. Wherein, the first number threshold is smaller than the second number threshold.

Optionally, the rail pressure control method of the vehicle also includes:

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, the value of the reference number of times in the memory is updated to the second preset number of times.

Optionally, the memory is a read-only memory.

In a second aspect, the present application provides a rail pressure control device for a vehicle, including:

The acquiring module is configured to acquire the reference duration pre-stored in the memory of the vehicle when the engine of the vehicle is started.

The determination module is configured to determine the current fuel demand value of the vehicle according to the reference duration and the preset fuel demand value of the vehicle.

The establishment module is used to establish the rail pressure of the vehicle according to the current oil demand.

The obtaining module is also used to obtain the first duration between the moment when the engine starts and the first moment when the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when determining the compression top dead center position of each cylinder of the vehicle, The first moment is the moment when it is determined that the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle.

The processing module is configured to update the reference duration in the memory according to the first duration, and the updated reference duration is used to correct the required fuel quantity value of the vehicle when the vehicle is started next time.

Optionally, identify modules, specifically for:

According to the preset corresponding relationship between the time length and the corrected oil volume value, the target corrected oil volume value corresponding to the reference time length is determined. According to the target corrected fuel quantity value and the preset required fuel quantity value of the vehicle, the current required fuel quantity value of the vehicle is determined.

Optionally, the processing module is specifically used for:

The sum of the reference duration and the first duration is acquired, and an updated reference duration is determined according to the sum.

Optionally, get the module, also used for:

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, the reference number pre-stored in the memory of the vehicle is acquired.

Processing modules, specifically for:

The reference count is added to the first preset count, and the reference duration in the memory is updated according to the accumulated reference count.

Optionally, the processing module is specifically used for:

If the accumulated reference times are greater than the first number threshold, the difference between the reference duration in the memory and the first preset duration is acquired, and an updated reference duration is determined according to the difference.

Optionally, processing modules are also used to:

If the accumulated reference times are greater than the second times threshold, the value of the reference duration in the memory is set as the second preset duration to obtain an updated reference duration. Wherein, the first number threshold is smaller than the second number threshold.

Optionally, processing modules are also used to:

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, the value of the reference number of times in the memory is updated to the second preset number of times.

Optionally, the memory is a read-only memory.

In a third aspect, the present application provides a rail pressure control device for a vehicle, including: a memory and a processor.

The memory is used to store program instructions.

The processor is used to call the program instructions in the memory to execute 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, including: an engine, a plurality of cylinders, and the vehicle rail pressure control device according to the second aspect or the third aspect.

In the fifth aspect, the present application provides a computer-readable storage medium. Computer program instructions are stored in the computer-readable storage medium. When the computer program instructions are executed, the rail pressure control method of the vehicle as described in the first aspect of the application is implemented. .

In a sixth aspect, the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the rail pressure control method for a vehicle as described in the first aspect of the present application is implemented.

The rail pressure control method and device of the vehicle provided in the present application obtain the reference time length pre-stored in the memory of the vehicle when starting the engine of the vehicle, and determine the current demand of the vehicle according to the reference time length and the preset required fuel volume value of the vehicle Fuel volume value, according to the current oil demand, establish the rail pressure of the vehicle, 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, then the time when the engine starts to The first duration between the first moments. The first moment is the moment when it is determined that the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle. According to the first duration, the reference duration in the memory is updated, and the updated reference duration is used for the vehicle to disembark. Correct the fuel demand value of the vehicle at the first start. Since the present application can correct the required fuel quantity for starting the vehicle according to the rail pressure establishment time, and establish the rail pressure of the vehicle according to the corrected required fuel quantity, the rail pressure can be quickly established when the vehicle is started, ensuring that the engine of the vehicle can be started , to speed up the engine start.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of an application scenario provided by an embodiment of the present application;

FIG. 2 is a flow chart of a rail pressure control method for a vehicle provided in an embodiment of the present application;

3 is a flowchart of a rail pressure control method for a vehicle provided in another embodiment of the present application;

4 is a flow chart of a rail pressure control method for a vehicle provided in another embodiment of the present application;

5 is a schematic structural diagram of a rail pressure control device for a vehicle provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a rail pressure control device for a vehicle provided in another embodiment of the present application;

Fig. 7 is a schematic structural diagram of a vehicle provided by an embodiment of the present application.

detailed description

In order to make the purposes, 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 in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

High pressure common rail fuel injection technology is one of the key technologies for energy saving and emission reduction of vehicle diesel engines. Stability and dynamic response directly affect the performance of the engine in each working condition.

At present, when the engine is started, the ECU is responsible for the rail pressure control, and the ECU establishes the rail pressure through the fuel metering unit with a fixed required fuel quantity. In the case of harsh environmental conditions or low working efficiency of the fuel quantity metering unit, the rail pressure may be slow to build up in the above process of building up the rail pressure, which may cause the engine to start slowly or even difficult to start.

Therefore, the present application provides a rail pressure control method and device for a vehicle, which corrects the required oil quantity for engine startup based on the rail pressure build-up time when the engine is started, and quickly builds up the rail pressure to start the engine as soon as possible.

Fig. 1 is a schematic diagram of an application scenario provided by an embodiment of the present application. As shown in Fig. 1, the fuel oil in the fuel tank 101 is controlled by controlling the oil quantity metering unit 100 to enter the oil quantity of the high-pressure oil pump 103 through the oil pipe 102. After the high-pressure oil pump 103 is pressurized The signal is sent to the high-pressure common rail pipe 104, and the ECU 105 collects the signal of the rail pressure sensor 106, the signal of the crankshaft speed sensor 107 and the signal of the camshaft speed sensor 108. When the ECU determines the compression top dead center position of each cylinder 110 according to the signal of the crankshaft speed sensor 107 and the signal of the camshaft speed sensor 108, and the rail pressure obtained according to the signal of the rail pressure sensor 106 is greater than the minimum allowable rail pressure, it controls the fuel injection The oil injector 109 (there are multiple injectors, one injector is shown in Fig. 1) is sprayed into the cylinder 110 (there are multiple cylinders, and each cylinder corresponds to the injector one by one) to burn and do work, thereby driving The engine runs to start the vehicle. For the specific implementation process of establishing the vehicle rail pressure, reference may be made to the schemes of the following embodiments.

Fig. 2 is a flowchart of a rail pressure control method for a vehicle provided by an embodiment of the present application, and the method of this embodiment can be applied to a vehicle. As shown in Figure 2, the method of this embodiment includes:

S201. When starting the engine of the vehicle, acquire the reference duration pre-stored in the memory of the vehicle.

In this embodiment, the reference time length has been pre-stored in the memory of the vehicle, therefore, when the engine of the vehicle is started, the reference time length pre-stored in the memory of the vehicle is acquired. Specifically, when starting the engine of the vehicle for the first time, the reference time length pre-stored in the memory of the vehicle is, for example, 0; The duration is the reference duration stored when the vehicle's engine was started last time.

Optionally, the memory is a read-only memory.

In this embodiment, the memory is a read-only memory, which can still store data without losing data after the vehicle is powered off. The read-only memory is, for example: Electrically Erasable Programmable Read Only Memory (EEPROM), or Programmable Read Only Memory (Programmable ReadOnly Memory, PROM), or, erasable Programmable Read Only Memory ( Erasable Programmable Read Only Memory, EPROM). When the power switch of the vehicle is turned off, the reference duration is stored in the read-only memory. When the vehicle is started next time, it is ensured that the reference duration can be read from the read-only memory.

S202. Determine the current fuel demand value of the vehicle according to the reference time length and the preset fuel demand value of the vehicle.

In this embodiment, the reference duration and the preset required fuel quantity value of the vehicle have been obtained, wherein the preset required fuel quantity value of the vehicle is a fixed fuel quantity value, for example, 10000 mm3/s. Therefore, according to the reference time period and the preset fuel demand value of the vehicle, the current fuel demand value of the vehicle is determined.

S203. Establish the rail pressure of the vehicle according to the current oil demand.

In this embodiment, the current fuel demand value of the vehicle has been obtained, therefore, the rail pressure of the vehicle is established according to the current fuel demand. After the rail pressure of the vehicle is established, the ECU controls the fuel injector to inject fuel into the cylinder to burn and do work, thereby driving the engine to run and realizing the start of the vehicle.

S204. If the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when determining the compression top dead center position of each cylinder of the vehicle, then obtain the first duration between the moment when the engine starts and the first moment, the first moment is The moment at which the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle is determined.

In this embodiment, specifically, the ECU determines the compression top dead center position of each cylinder through the signal of the crankshaft speed sensor and the signal of the camshaft speed sensor, and obtains the rail pressure of the vehicle through the signal of the rail pressure sensor. The minimum allowable rail pressure of the vehicle is an experimental calibration value, for example, 200bar. If the ECU determines the compression top dead center position of each cylinder of the vehicle (that is, there is a synchronous signal), and the rail pressure of the vehicle obtained by the rail pressure sensor signal is less than or equal to the minimum allowable rail pressure of the vehicle, then the time when the engine is started is acquired. The first duration between the first moments, wherein the moment when the engine is started is the moment when the engine speed is 0, and the first moment is the moment when it is determined that the current rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle. For example: use n to represent the rotational speed of the engine, use p to represent the rail pressure, use p _min to represent the minimum rail pressure, and use t _i to represent the first duration, then calculate the moment when the speed n changes from 0 to greater than 0 until the rail pressure p>p _min The duration between moments of is the first duration t _i .

S205. Update the reference duration in the memory according to the first duration, and the updated reference duration is used to correct the required fuel quantity value of the vehicle when the vehicle is started next time.

In this embodiment, the first duration and the reference duration in the memory have been obtained. Therefore, according to the first duration, the reference duration in the memory is updated, and the updated reference duration is used to correct the fuel demand of the vehicle when the vehicle starts next time. value.

Optionally, the sum of the reference duration and the first duration is obtained, and an updated reference duration is determined according to the sum.

In this embodiment, the reference duration and the first duration have been obtained, therefore, the sum of the reference duration and the first duration is equal to the updated reference duration.

On the basis of the above embodiments, when the engine of the vehicle is started next time, the actions corresponding to the above steps S201-S205 can be continued.

The rail pressure control method of the vehicle provided by this application obtains the reference time length pre-stored in the memory of the vehicle when starting the engine of the vehicle, and determines the current oil demand of the vehicle according to the reference time length and the preset oil demand value of the vehicle value, according to the current oil demand, establish the rail pressure of the vehicle, 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, then the moment when the engine starts is obtained to the first The first time between times. The first time is the moment when the rail pressure of the vehicle is determined to be greater than the minimum allowable rail pressure of the vehicle. According to the first time, the reference time in the memory is updated. The updated reference time is used for the next start of the vehicle Correct the fuel demand value of the vehicle in real time. Since the present application can correct the required fuel quantity for starting the vehicle according to the rail pressure establishment time, and establish the rail pressure of the vehicle according to the corrected required fuel quantity, the rail pressure can be quickly established when the vehicle is started, ensuring that the engine of the vehicle can be started , to speed up the engine start.

On the basis of the embodiment shown in Figure 2, in some embodiments, Figure 3 is a flowchart of a rail pressure control method for a vehicle provided in another embodiment of the present application, as shown in Figure 3, the method of this embodiment includes :

S301. When starting the engine of the vehicle, acquire the reference time length pre-stored in the memory of the vehicle.

In this embodiment, for the specific implementation process of S301, reference may be made to the related description of the embodiment shown in FIG. 2 , which will not be repeated here.

S302. According to the preset corresponding relationship between the time length and the corrected oil volume value, determine a target corrected oil volume value corresponding to the reference time length.

In this embodiment, a preset corresponding relationship between the duration and the corrected oil quantity value has been determined, and the preset corresponding relationship is an experimental calibration value of the relationship between the duration and the corrected fuel quantity value. For example: Table 1 is an example of the preset correspondence between the duration and the corrected oil volume value. As shown in Table 1, when the duration is 0, the corrected fuel volume value is 0; when the duration is 100 milliseconds, the corrected fuel volume value is 1000 cubic millimeters per second. Therefore, according to the obtained reference time length, the preset corresponding relationship is checked to determine the target corrected oil quantity value corresponding to the reference time length. For the value of the reference time length ≥ 0, when querying the preset correspondence between the time length and the corrected oil volume value according to the reference time length, the obtained corrected oil volume value corresponding to the reference time length cannot exceed the maximum boundary value of the corrected oil volume value . For example: in Table 1, when the reference time length is greater than 1000 milliseconds, the corresponding corrected oil volume value is still 8000 cubic millimeters per second.

Table 1 Example of the preset correspondence between the duration and the corrected oil volume value

Duration (milliseconds) 0 100 500 1000 Corrected oil volume value (mm3/s) 0 1000 5000 8000

S303. Determine the current fuel demand value of the vehicle according to the target corrected fuel volume value and the preset fuel demand value of the vehicle.

In this embodiment, the target corrected fuel volume value and the preset required fuel volume value of the vehicle have been obtained, wherein the preset required fuel volume value of the vehicle is a fixed fuel volume value, for example, 10000 cubic millimeters per second, so , the sum of the target corrected fuel volume value and the vehicle's preset demanded fuel volume value is equal to the vehicle's current demanded fuel volume value, and the rail pressure can be quickly established by increasing the vehicle's starting fuel volume.

S304. Establish the rail pressure of the vehicle according to the current fuel demand.

S305. If the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when determining the compression top dead center position of each cylinder of the vehicle, then obtain the first duration between the moment when the engine starts and the first moment, the first moment is The moment at which the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle is determined.

S306. Update the reference duration in the memory according to the first duration, and the updated reference duration is used to correct the required fuel quantity value of the vehicle when the vehicle is started next time.

In this embodiment, for the specific implementation process of S304, S305, and S306, reference may be made to the related description of the embodiment shown in FIG. 2 , which will not be repeated here.

S307. If the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when determining the compression top dead center position of each cylinder of the vehicle, update the value of the reference count in the memory to the second preset count.

In this embodiment, specifically, the second preset number of times is, for example, 0. If the ECU determines the compression top dead center position of each cylinder of the vehicle (that is, there is a synchronous signal), and the rail pressure of the vehicle obtained by the rail pressure sensor signal is less than or equal to the minimum allowable rail pressure of the vehicle, then the reference times in the memory The value is updated to 0.

It should be noted that the sequence of execution of S305, S306, and S307 is not limited.

S308. 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, obtain the reference times pre-stored in the memory of the vehicle, add the reference times to the first preset times, according to the accumulated After the number of references, update the reference duration in memory.

In this embodiment, specifically, the first preset number of times is, for example, 1, and when the engine of the vehicle is started for the first time, the reference number of times pre-stored in the memory of the vehicle is 0. The memory is, for example, EEPROM, and when the power switch of the vehicle is turned off, the reference duration is stored in the EEPROM. When the vehicle is started next time, the reference duration can be read from the EEPROM. If the ECU determines the compression top dead center position of each cylinder of the vehicle (that is, there is a synchronous signal), the rail pressure of the vehicle obtained by the rail pressure sensor signal is greater than the minimum allowable rail pressure of the vehicle, then the pre-stored in the memory of the vehicle is obtained. The reference count is to add the reference count to the first preset count. The reference duration in the memory is updated according to the accumulated reference times.

Optionally, if the accumulated reference times are greater than the first number threshold, the difference between the reference duration in the memory and the first preset duration is acquired, and an updated reference duration is determined according to the difference.

In this embodiment, specifically, the first number threshold is, for example, 2, which is an experimental calibration value, and the first preset duration is, for example, 1 second, which is an experimental calibration value. For example: use NUM to represent the accumulated reference times, use NUM1 to represent the threshold of the first number, use Ti1 to represent the reference duration in the memory, and use Δti to represent the first preset duration, then if NUM>NUM1, then subtract Δti from Ti1 , to obtain the updated reference duration Ti1.

Optionally, if the accumulated reference times are greater than the second times threshold, the value of the reference duration in the memory is set to the second preset duration to obtain an updated reference duration, wherein the first times threshold is less than the second times threshold.

In this embodiment, specifically, the second count threshold is, for example, 5, which is an experimental calibration value, the second preset duration is, for example, 0, and the first count threshold is smaller than the second count threshold. For example: use NUM to represent the accumulated reference times, use NUM2 to represent the second time threshold, and use Ti1 to represent the reference duration in the memory, then if NUM>NUM2, then Ti1 will be cleared to obtain the updated reference duration Ti1=0, Therefore, there is no need to correct the starting oil quantity of the vehicle.

On the basis of the above embodiments, when the engine of the vehicle is started next time, the actions corresponding to the above steps S301-S308 can be continued.

The rail pressure control method of the vehicle provided by the present application can correct the required fuel quantity for starting the vehicle according to the rail pressure establishment time, and establish the rail pressure of the vehicle according to the corrected required fuel quantity. Furthermore, the oil quantity required for starting the vehicle is corrected. Therefore, the present application can ensure that the rail pressure is quickly established when the vehicle is started, thereby speeding up the starting of the vehicle engine.

On the basis of the embodiment shown in FIG. 3 , in some embodiments, FIG. 4 is a flow chart of a rail pressure control method for a vehicle provided in another embodiment of the present application. As shown in FIG. 4 , the method of this embodiment includes :

S401. When starting the engine of the vehicle, acquire Ti1 and NUM pre-stored in the memory of the vehicle, wherein Ti1 represents a reference time length, and NUM represents a reference number of times.

S402. Determine a dvol _target corresponding to Ti1 according to the preset corresponding relationship between the duration and the corrected fuel volume value, where the dvol _target represents the target corrected fuel volume value.

S403. Determine the _current dvol according to the dvol _target and dvol, namely: dvol _current =dvol+dvol _target , where dvol represents the preset fuel demand value of the vehicle, and dvol _current represents the current fuel demand value of the vehicle.

S404. Establish the rail pressure p of the vehicle according to the _current dvol, where p represents the rail pressure of the vehicle.

S405. When determining the compression top dead center position of each cylinder of the vehicle, it is judged whether p is greater than p _min , wherein p _min represents the minimum allowable rail pressure of the vehicle.

S406. Obtain the duration t _i between the moment when the engine speed n changes from 0 to greater than 0 to the moment when the rail pressure p>p _min , and update NUM to 0, where t _i represents the moment when the engine starts to the first moment The first time period between the first moments is the moment when it is determined that the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle.

S407. Update Ti1 according to t _i , that is: Ti1=Ti1+t _i .

S408. Add 1 to NUM, where 1 represents an example value of the first preset number of times.

S409. Determine whether NUM is greater than NUM1, where NUM1 represents the first number threshold.

S410. Obtain the difference between Ti1 and Δti in the memory, and determine an updated Ti1 according to the difference, that is, Ti1=Ti1-Δti, where Δti represents the first preset duration.

S411. Determine whether NUM is greater than NUM2, where NUM2 represents a second count threshold.

S412. Set the value of Ti1 to 0, namely: Ti1=0, and obtain the updated reference time length Ti1.

S413. When the power switch of the vehicle is turned off, store the updated Ti1 and NUM in the memory of the vehicle.

In this embodiment, for the specific implementation process of S401-S413, reference may be made to the relevant description of the embodiment shown in FIG. 2 or FIG. 3 , which will not be repeated here.

The rail pressure control method of the vehicle provided by the present application can correct the required fuel quantity for starting the vehicle according to the rail pressure establishment time, and establish the rail pressure of the vehicle according to the corrected required fuel quantity. Furthermore, the oil quantity required for starting the vehicle is corrected. Therefore, the present application can ensure that the rail pressure is quickly established when the vehicle is started, thereby speeding up the starting of the vehicle engine.

Fig. 5 is a schematic structural diagram of a vehicle rail pressure control device provided by an embodiment of the present application. As shown in Fig. 5 , the vehicle rail pressure control device 500 of this embodiment includes: an acquisition module 501, a determination module 502, and an establishment module 503 , processing module 504 .

An acquisition module 501, configured to acquire the reference duration pre-stored in the memory of the vehicle when the engine of the vehicle is started;

A determining module 502, configured to determine the current fuel demand value of the vehicle according to the reference time length and the preset fuel demand value of the vehicle;

Establishment module 503, used to establish the rail pressure of the vehicle according to the current fuel demand;

The obtaining module 501 is also used to obtain the first duration between the moment when the engine is started and the first moment if the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when determining the compression top dead center position of each cylinder of the vehicle , the first moment is the moment when it is determined that the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle;

The processing module 504 is configured to update the reference duration in the memory according to the first duration, and the updated reference duration is used to correct the fuel demand value of the vehicle when the vehicle starts next time.

On the basis of any of the above-mentioned embodiments, the determining module 502 is specifically configured to:

Determine the target corrected fuel value corresponding to the reference time according to the preset corresponding relationship between the duration and the corrected fuel value; determine the current fuel demand value of the vehicle according to the target corrected fuel value and the preset required fuel value of the vehicle .

On the basis of any of the above-mentioned embodiments, the processing module 504 is specifically configured to:

Obtain the sum of the reference duration and the first duration; determine the updated reference duration according to the sum.

On the basis of any of the above-mentioned embodiments, the obtaining module 501 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, the reference number pre-stored in the memory of the vehicle is obtained.

The processing module 504 is specifically used for:

Accumulate the reference times by the first preset times; update the reference duration in the memory according to the accumulated reference times.

On the basis of any of the above-mentioned embodiments, the processing module 504 is specifically configured to:

If the accumulated reference times are greater than the first number threshold, the difference between the reference duration in the memory and the first preset duration is acquired, and an updated reference duration is determined according to the difference.

On the basis of any of the above shown embodiments, the processing module 504 is further configured to:

If the accumulated reference number of times is greater than the second times threshold, the value of the reference duration in the memory is set as the second preset duration to obtain an updated reference duration;

Wherein, the first number threshold is smaller than the second number threshold.

On the basis of any of the above shown embodiments, the processing module 504 is further configured to:

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, the value of the reference number of times in the memory is updated to the second preset number of times.

On the basis of any one of the above-mentioned embodiments, the memory is a read-only memory.

The device in this embodiment can be used to execute the technical solution of any one of the method embodiments shown above, and its implementation principle and technical effect are similar, and will not be repeated here.

FIG. 6 is a schematic structural diagram of a rail pressure control device for a vehicle provided in another embodiment of the present application. As shown in FIG. 6 , the rail pressure control device 600 for a vehicle in this embodiment includes: one or more memories 601 and a processor 602 . Wherein, the memory 601 and the processor 602 are connected through a bus.

The memory 601 is used to store program instructions.

The processor 602 is used to call the program instructions in the memory to execute:

When starting the engine of the vehicle, obtain the reference time length pre-stored in the memory of the vehicle; determine the current fuel demand value of the vehicle according to the reference time length and the preset fuel demand value of the vehicle; establish the track of the vehicle according to the current fuel demand If the rail pressure of the vehicle is less than or equal to the minimum allowable rail pressure of the vehicle when determining the compression top dead center position of each cylinder of the vehicle, the first time period between the moment when the engine is started and the first moment is obtained, and the first moment is Determine the moment when the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle; update the reference duration in the memory according to the first duration, and the updated reference duration is used to correct the fuel demand value of the vehicle when the vehicle starts next time.

On the basis of any of the above-mentioned embodiments, the processor 602 is specifically configured to:

According to the preset corresponding relationship between the duration and the corrected fuel value, determine the target corrected fuel value corresponding to the reference duration; determine the current fuel demand value of the vehicle according to the target corrected fuel value and the preset required fuel value of the vehicle .

On the basis of any of the above-mentioned embodiments, the processor 602 is specifically configured to:

Obtain the sum of the reference duration and the first duration; determine the updated reference duration according to the sum.

On the basis of any of the above-mentioned 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 each cylinder compression top dead center position of the vehicle is determined, obtain the reference times stored in advance in the memory of the vehicle; add the reference times to the first preset times; according to the accumulated Reference times, update the reference duration in memory.

On the basis of any of the above-mentioned embodiments, the processor 602 is specifically configured to:

If the accumulated reference times are greater than the first number threshold, the difference between the reference duration in the memory and the first preset duration is acquired, and an updated reference duration is determined according to the difference.

On the basis of any of the above-mentioned embodiments, the processor 602 is further configured to:

If the accumulated reference number of times is greater than the second times threshold, the value of the reference duration in the memory is set as the second preset duration to obtain an updated reference duration;

Wherein, the first number threshold is smaller than the second number threshold.

On the basis of any of the above-mentioned embodiments, the processor 602 is further configured to:

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, the value of the reference number of times in the memory is updated to the second preset number of times.

On the basis of any one of the above-mentioned embodiments, the memory is a read-only memory.

Optionally, the memory storing the reference duration and/or the reference count and the memory storing the program instructions may be the same memory or different memories.

The device in this embodiment can be used to execute the technical solution of any one of the method embodiments shown above, and its implementation principle and technical effect are similar, and will not be repeated here.

Fig. 7 is a schematic structural diagram of a vehicle provided by an embodiment of the present application. As shown in Fig. 7, the vehicle 700 of this embodiment includes: an engine 710, a plurality of cylinders 720, and a rail pressure control device 730 of the vehicle. Correspondingly, it can The implementation principle and technical effect of the technical solution of any one of the method embodiments in Fig. 2 to Fig. 4 are similar and will not be repeated here.

The present application also provides a computer program product, including a computer program. When the computer program is executed by a processor, the solution of the above rail pressure control method for a vehicle is realized.

The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the processor executes the computer-executable instructions, the above solution of the rail pressure control method for a vehicle is realized.

The above-mentioned computer-readable storage medium, the above-mentioned readable storage medium can be realized by any type of volatile or non-volatile storage device or their combination, 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 can also be a component of the processor. The processor and the readable storage medium may be located in an application specific integrated circuit (Application Specific Integrated Circuits, ASIC for short). Of course, the processor and the readable storage medium can also exist in the rail pressure control device of the vehicle as discrete components.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims (11)

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; the pre-stored reference time period is a reference time period stored when an engine of the vehicle was started last time;

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 the rail pressure of the vehicle according to the current required oil quantity value;

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;

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;

the determining the current oil demand value of the vehicle according to the reference time length and the preset oil demand value of the vehicle comprises the following steps:

determining a target correction oil quantity value corresponding to the reference time length according to a preset corresponding relation between the reference 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.

2. 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 value.

3. 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; the pre-stored reference number of times is the number of times that the rail pressure of the vehicle is greater than the minimum allowable rail pressure of the vehicle when the engine of the vehicle was started last time;

accumulating the reference times by a first preset time;

and updating the reference time length in the memory according to the accumulated reference times.

4. The method of claim 3, 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.

5. The method of claim 4, 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.

6. The method of claim 5, 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.

7. The method of any of claims 1-6, wherein the memory is a read-only memory.

8. 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 pre-stored reference time period is a reference time period stored when an engine of the vehicle was started last time;

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 quantity demand value;

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;

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;

the determining module is specifically used for determining a target correction oil quantity value corresponding to the reference duration according to a preset corresponding relation between the reference duration 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.

9. 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 1-7.

10. A vehicle, characterized by comprising: an engine, a plurality of cylinders, a rail pressure control apparatus of a vehicle according to claim 8 or 9.

11. 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 7.

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