Monoblock pump common rail rapid pressure building method and device and motor vehicle

Abstract

The invention relates to a monoblock pump common rail rapid pressure building method and device and a motor vehicle. Before a tooth missing signal is obtained, the obtained first tooth signal is a virtual 0 tooth, the obtained second tooth signal is a virtual 1 tooth, and so on; when the virtual N0 tooth is obtained, the monoblock pump is driven to operate according to the pre-calibrated driving duration; during the period that the monoblock pump continuously runs to the virtual 2N0 tooth, if no tooth missing signal is obtained and the pressure in the common rail pipe is increased, the odd number times of N0 serves as the driving moment of the monoblock pump, and the driving duration is N0 tooth signals; and if the pressure in the common rail pipe does not rise, the pressure of the common rail pipe is increased by taking even number times of N0 as the driving moment of the monoblock pump and the driving duration of N0 tooth signals.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a method and device for quickly building pressure of a single pump common rail, and a motor vehicle. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The fuel system of diesel engines gradually adopts the form of high-pressure common rail plus electronically controlled fuel injectors to obtain high-pressure fuel in the high-pressure common rail. There are currently two ways to provide high-pressure oil for the common rail: one is to pump oil through a high-pressure oil pump, and control the amount of fuel entering the high-pressure common rail through an oil metering unit to control the pressure in the rail; the other is to provide fuel to the high-pressure common rail through a combination of multiple electronically controlled single pumps, and control the fuel supply by controlling the opening time and opening moment of the single pump to control the pressure in the rail.

[0004] The required pressure in the common rail is the basis for the electronic fuel injector to spray fuel. During the process of engine stopping and starting, the fuel in the common rail gradually increases, and the pressure increases from normal pressure to the required pressure, which is called the pressure building process. When multiple electronically controlled unit pumps are used for pressure building, the injection delay caused by the synchronization delay of the unit pumps makes the pressure building process slow, resulting in a longer engine start time. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a method, device and motor vehicle for quickly building pressure of a common rail with a single pump, which can supply oil and build pressure in the rail as early as possible before the phase synchronization of the single pump group, shorten the injection delay caused by the single synchronization delay, build pressure and inject in advance, and shorten the starting time of the engine.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a method for quickly building pressure of a common rail of a single pump, comprising the following steps:

[0008] Obtain the tooth signal of the single pump signal plate. If a missing tooth signal is obtained, the missing tooth signal is used to synchronize the single pump, and the driving time and driving duration of the single pump are determined according to the current rail pressure demand to increase the pressure of the common rail pipe;

[0009] Before obtaining the missing tooth signal, the first tooth signal obtained is the virtual tooth No. 0, the second tooth signal is the virtual tooth No. 1, and so on; when the virtual tooth No. N0 is obtained, the single pump is driven to operate according to the pre-calibrated driving time;

[0010] During the period when the single pump continues to run until the virtual 2N0 tooth, if the missing tooth signal is still not obtained and the pressure in the common rail pipe rises, an odd multiple of N0 is used as the driving moment of the single pump, and the driving duration is N0 tooth signals;

[0011] If the pressure in the common rail pipe does not rise, an even multiple of N0 is used as the driving moment of the monomer pump, an odd multiple of N0 is used as the closing moment of the monomer pump, and the driving duration is N0 tooth signals to increase the pressure of the common rail pipe.

[0012] Furthermore, when the single pump continues to run to the virtual 2N0 tooth, if a missing tooth signal is obtained, the single pump is synchronized using the missing tooth signal, and the driving time and driving duration of the single pump are determined according to the current rail pressure requirement to increase the pressure of the common rail pipe.

[0013] Furthermore, after the single pump is started at least once by odd multiples of N0 and / or even multiples of N0, the tooth signal is continuously obtained. If a missing tooth signal is obtained, the missing tooth signal is used to synchronize the single pump, and the driving time and driving duration of the single pump are determined according to the current rail pressure requirement to increase the pressure of the common rail pipe.

[0014] Further, after the monomer pump is started at least once by odd multiples N0 and / or even multiples N0, the tooth signal is continuously obtained until the moment of closing the monomer pump is reached. If the engine is completely stopped, the pressure building process is terminated.

[0015] Furthermore, the tooth signal of the monomer pump signal disk is obtained, specifically: the initial state of the engine is the shutdown state, the ECU is powered on and completes initialization; the engine is started, and the engine crankshaft drives the monomer pump signal disk to run through the camshaft, and when the first tooth signal of the monomer pump signal disk is obtained, the tooth signal detection state is entered, and the tooth signal of the monomer pump signal disk is continuously obtained.

[0016] Furthermore, when the engine crankshaft drives the unit pump signal disk through the camshaft, if the tooth signal of the signal disk is not obtained, the waiting detection state is cut in, and the tooth signal detection state is cut in until the first tooth signal is obtained.

[0017] Furthermore, N0=N3 / N1 / N2 / 2, N1 is the number of single pumps controlled by the signal disk, N2 is the number of lobes of the cam in the single pump, and N3 is the total number of teeth on the signal disk.

[0018] Furthermore, the missing tooth signal is used to synchronize the monomer pump. Specifically, when the signal disk turns to the missing tooth position, a widened pulse signal corresponding to the missing tooth position is sent to the ECU. The ECU determines the relative position between the missing tooth position of the signal disk and the top dead center of the monomer pump cam, that is, the number of teeth, based on the widened pulse signal, and obtains the position of the top dead center of the monomer pump cam. When the monomer pump runs to the top dead center of the cam, fuel injection is executed to boost the common rail pipe pressure.

[0019] A second aspect of the present invention provides a single pump common rail rapid pressure building device, comprising:

[0020] A signal acquisition module, used to obtain the tooth signal of the single pump signal disk and send it to the controller;

[0021] The controller is configured to: if a missing tooth signal is obtained, synchronize the single pump using the missing tooth signal, and determine the driving time and driving duration of the single pump according to the current rail pressure demand, and increase the pressure of the common rail pipe;

[0022] The controller is further configured to: before obtaining the missing tooth signal, the first tooth signal obtained is the virtual tooth No. 0, the second tooth signal is the virtual tooth No. 1, and so on; when the virtual tooth No. N0 is obtained, the single pump is driven to operate according to the pre-calibrated driving time;

[0023] The controller is further configured to: during the period when the monomer pump continues to operate until the virtual 2N0 tooth, if the missing tooth signal is still not obtained and the pressure in the common rail pipe rises, an odd multiple of N0 is used as the driving moment of the monomer pump, and the driving duration is N0 tooth signals, and an even multiple of N0 is used as the closing moment of the monomer pump;

[0024] The controller is further configured to: if the pressure in the common rail pipe does not rise, use even multiples of N0 as the driving time of the monomer pump, odd multiples of N0 as the closing time of the monomer pump, and the driving duration is N0 tooth signals to increase the pressure of the common rail pipe.

[0025] A third aspect of the present invention provides a motor vehicle having a common rail and at least one group of unit pumps for boosting the pressure of the common rail, wherein a controller of the unit pump executes the above-mentioned unit pump common rail rapid pressure building method.

[0026] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0027] Under normal circumstances, the missing tooth signal will be used to synchronize the unit pump and then increase the pressure in the common rail. Before the unit pump group is synchronized, that is, before the missing tooth signal is obtained, there is a waiting period. In order to shorten the waiting period, this scheme performs fuel supply and pressure building in the rail as early as possible, shortens the injection delay caused by the unit synchronization delay, and marks when the tooth signal begins to be obtained. After a certain set tooth signal is reached, the unit pump is started in advance to build pressure for the common rail, thereby achieving early injection and shortening the engine start time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 It is a schematic diagram of an engine signal panel and a monomer pump combination signal panel provided by one or more embodiments of the present invention;

[0030] Figure 2 is a schematic diagram of a combined cam profile of a single pump provided by one or more embodiments of the present invention;

[0031] Figure 3 is a schematic diagram of phase information of a single pump provided by one or more embodiments of the present invention;

[0032] Figure 4 It is a flow chart of the single pump common rail rapid pressure building period in the synchronization state StSyn=1 provided by one or more embodiments of the present invention;

[0033] Figure 5 It is a flow chart of the single pump common rail rapid pressure building period in the synchronous state StSyn=0 provided by one or more embodiments of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Terminology explanation:

[0038] Common rail pipe, in the electronically controlled common rail diesel engine, the common rail pipe is a steel pipe for storing high-pressure fuel. It is responsible for storing high-pressure fuel and connecting the electronically controlled injectors of each cylinder through a high-pressure oil pipe to ensure that the fuel injection pressure and flow of each cylinder are uniform and equal.

[0039] The high-pressure common rail system of a diesel engine uses a large common rail cavity to accumulate the high-pressure fuel output by the oil pump and eliminate pressure fluctuations in the fuel. The electronic control unit (ECU) determines the appropriate injection timing and duration according to the operating status of the engine, and starts and stops the injection by controlling the solenoid valve on the injector. The pressure in the common rail pipe is adjusted by the electronic control unit according to the rail pressure measured by the rail pressure sensor and the needs.

[0040] Therefore, the following embodiments provide a method, device and motor vehicle for quickly building pressure in a common rail with a single pump, which can supply oil and build pressure in the rail as early as possible before the phase synchronization of the single pump group, shorten the injection delay caused by the single synchronization delay, build pressure and inject in advance, and shorten the start time of the engine.

[0041] Embodiment 1:

[0042] When the engine is started, it is necessary to build up pressure for the common rail pipe, that is, to pump oil into the common rail pipe through a high-pressure oil pump or a plurality of combined single pumps.

[0043] For example, when two unit pumps are combined to supply oil, the engine crankshaft drives the unit pump through a camshaft, such as Figure 1 The engine crankshaft and monomer pump combined signal disk are shown, where the larger signal disk on the right is the engine crankshaft signal disk, and the smaller signal disk on the left is the monomer pump combined signal disk. Since the speed ratio of the two signal disks is not 1:1, the position of the monomer pump relative to the crankshaft during operation cannot be determined based on the crankshaft signal disk.

[0044] Therefore, the prior art generally adopts a 60-2 toothed disc as a signal disc, that is, the toothed disc has 60 teeth in one circle, 2 of which are missing teeth, so that the toothed disc emits a pulse wave corresponding to the missing tooth position every time it rotates one circle to form a missing tooth signal, and the missing tooth signal is used as a mark for position identification.

[0045] In addition, each monomer pump has a cam, the shape of the cam is as follows: Figure 3 As shown, it includes three lobes. Each single pump can pump oil three times in each cycle. The position of each oil pumping corresponds to the position of each lobe, which is called the top dead center.

[0046] The cam and signal disk on the monomer pump act synchronously. By determining the relative position (number of teeth) between the top dead center of the cam and the missing teeth of the signal disk, the position information of the monomer pump is determined, thereby helping the controller to control the monomer pump to achieve drive control and indirectly achieve oil pumping control of the monomer pump.

[0047] Take the combination of two single pumps as an example. The cam profile of the single pump combination is as follows: Figure 2 As shown, the expansion information of the signal plate (60-2 tooth plate) of each single pump is as follows Figure 3As shown in the figure, since the cam and the signal disk are in synchronous motion, the top dead center position is fixed relative to the missing tooth position, and the top dead center position can be determined by the missing tooth position. When the engine is started for the first time, the missing tooth position needs to be detected. Before the missing tooth position is determined, the position of the monomer pump (the convex position) cannot be known, and the monomer pump oil supply cannot be controlled. As the engine rotates, the controller detects the missing tooth position and achieves synchronization. The position information of the monomer pump can be determined by counting teeth, thereby realizing the monomer pump drive control.

[0048] like Figure 4-Figure 5 As shown, a method for quickly building pressure of a common rail of a single pump comprises the following steps:

[0049] The initial state of the engine is shutdown, the ECU is powered on and initialized, waiting to detect whether there is a single pump gear speed signal. When each tooth of the gear rotates through the speed sensor, the speed sensor will recognize a tooth signal.

[0050] like Figure 4 As shown, wait for detection StTooth=0, and when the first single pump signal disc tooth signal is detected, enter the StTooth=1 state (detection tooth signal state). If not detected, continue to wait for detection StTooth=0.

[0051] The sprocket is a 60-2 sprocket, that is, the sprocket is divided into 60 parts equally, two of which are tooth-missing positions, and the tooth-missing positions are used as marks.

[0052] When the ECU detects a missing tooth signal, that is, identifies the precise position of the gear disc, it enters the synchronization state StSyn = 1. At this time, the fuel supply of the monomer pump can be precisely controlled. The rail pressure uses a PID closed loop to calculate the advance angle (relative to the top dead center of the convex lobe) and the opening duration of the monomer pump, and performs opening and closing control according to the monomer pump phase.

[0053] Specifically, by detecting the tooth signal, each tooth is marked (0, 1, 2, 3...), and the driving moment and driving time of the single pump are calculated according to the rail pressure demand. If the driving moment (tooth position) has not been reached at present, the tooth signal is continued to be detected. If the driving moment (tooth position) has been reached, a signal to start driving the single pump is sent, and the single pump is started to spray oil into the common rail pipe; the tooth signal is continued to be detected. If the closing driving moment (tooth position) has not been reached at present, the tooth signal is continued to be detected. If the closing driving moment (tooth position) has been reached at present, and the engine is completely stopped (EngN=0), the process ends. If the engine is not completely stopped, the tooth signal is continued to be detected.

[0054] like Figure 5As shown, before the ECU detects the missing tooth signal, it is in the synchronization state StSyn=0. At this time, the exact position of the single pump cannot be determined. In order to quickly supply oil to the rail to establish rail pressure, a part of the pressure is established by quickly supplying oil through trial supply.

[0055] Specifically, the tooth signal is detected, and each tooth is marked (0, 1, 2, 3...), that is, the first tooth identified is marked as virtual tooth No. 0, the second tooth is marked as virtual tooth No. 1, and so on. When a missing tooth signal is detected during this period, the synchronization state StSyn=1 is switched to control the single pump;

[0056] If no missing tooth signal is detected during this period, and the toothed disc rotates to the N0th tooth, the pre-calibrated driving time T is obtained; if the N0th tooth is not reached, the tooth signal is continued to be detected;

[0057] When the N0th tooth is reached, a signal to start the driving monomer pump is sent, and the monomer pump is controlled to start according to the pre-calibrated driving time T; during this period, the tooth signal is continuously detected, and when a missing tooth signal is detected, the synchronization state StSyn=1 is switched to control the monomer pump;

[0058] From the time when the N0 tooth sends out a signal to start the driving monomer pump, to the time period of 2N0, observe the pressure change process in the common rail pipe, and the duration is ≤N0, which can be calibrated; if no missing tooth signal is detected during this period, and when 2N0 teeth are reached, observe whether the pressure in the common rail pipe rises; if 2N0 teeth are not reached, obtain the pre-calibrated driving time T until 2N0 teeth are reached;

[0059] If the pressure in the common rail pipe rises, it is driven at odd times N0, and the driving time lasts for N0 teeth, and the corresponding even times N0 are closed; specifically: (2×N-1)×N0 is set as the driving moment of the single pump, and the driving time lasts for N0 teeth, where N is a natural number greater than 0;

[0060] If the pressure in the common rail pipe does not rise, the monomer pump is driven at an even multiple of N0, and the driving time lasts for N0 teeth, and the corresponding odd multiple of N0 turns off the monomer pump; specifically: (2×N)×N0 is set as the monomer pump driving moment, and the driving time lasts for N0 teeth, where N is a natural number greater than 0;

[0061] Among them, N0 teeth = 60 / number of single pumps / number of lobes / 2, number of single pumps N1, number of lobes of a single pump N2. In this embodiment, two single pumps share a signal disk, with different relative missing tooth positions, and 6 lobes are evenly distributed among 60 teeth.

[0062] In this embodiment, the above control process is described with N0=5.

[0063] If the pressure in the common rail pipe rises, it will be driven at odd times N0, and the driving time will last for N0 teeth, and the corresponding even times N0 will be closed; specifically: the single pump starts to drive at the 15th / 25th / 35th / 45th / 55th tooth, the running duration is 5 tooth signals, and it will be closed at the 20th / 30th / 40th / 50th / 60th tooth;

[0064] If the pressure in the common rail pipe does not rise, the single pump is driven at an even multiple of N0, and the driving time lasts for N0 teeth. The corresponding odd multiple of N0 closes the single pump; specifically: the single pump starts to drive at the 10th / 20th / 30th / 40th / 50th tooth, the operation lasts for 5 tooth signals, and is closed at the 15th / 25th / 35th / 45th tooth.

[0065] After the single pump is driven at least once by odd multiples of N0 and / or even multiples of N0, the tooth signal continues to be detected and marked until it is determined according to the tooth signal that the time to shut down the single pump has arrived. If the engine stops completely, the pressure building process is terminated. If a missing tooth signal is detected during this period, the synchronization state StSyn=1 is entered to control the single pump.

[0066] Through the above pressure building process, before the phase synchronization of the single pump group, the rail oil supply and pressure building are carried out as early as possible, shortening the injection delay caused by the single synchronization delay, building pressure and injecting in advance, and shortening the engine starting time.

[0067] Embodiment 2:

[0068] A single pump common rail rapid pressure building device, comprising:

[0069] A signal acquisition module, used to obtain the tooth signal of the single pump signal disk and send it to the controller;

[0070] The controller is configured to: if a missing tooth signal is obtained, synchronize the single pump using the missing tooth signal, and determine the driving time and driving duration of the single pump according to the current rail pressure demand, and increase the pressure of the common rail pipe;

[0071] The controller is further configured to: before obtaining the missing tooth signal, the first tooth signal obtained is the virtual tooth No. 0, the second tooth signal is the virtual tooth No. 1, and so on; when the virtual tooth No. N0 is obtained, the single pump is driven to operate according to the pre-calibrated driving time;

[0072] The controller is further configured to: during the period when the monomer pump continues to operate until the virtual 2N0 tooth, if the missing tooth signal is still not obtained and the pressure in the common rail pipe rises, an even multiple of N0 is used as the driving moment of the monomer pump, and the driving duration is N0 tooth signals;

[0073] The controller is further configured to: if the pressure in the common rail pipe does not rise, use odd multiples of N0 as the driving time of the monomer pump, and even multiples of N0 as the closing time of the monomer pump, and the driving duration is N0 tooth signals to increase the pressure of the common rail pipe.

[0074] Embodiment three:

[0075] A common rail pipe and at least one group of monomer pumps for boosting the pressure of the common rail pipe are provided, and a controller of the monomer pump executes the method for quickly building pressure of the common rail of the monomer pump in the first embodiment.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for rapid pressure building of a single pump common rail, characterized in that: The following steps are involved: Obtain the tooth signal of the single pump signal plate. If a missing tooth signal is obtained, the missing tooth signal is used to synchronize the single pump, and the driving time and driving duration of the single pump are determined according to the current rail pressure demand to increase the pressure of the common rail pipe; Before obtaining the missing tooth signal, the first tooth signal obtained is the virtual tooth No. 0, the second tooth signal is the virtual tooth No. 1, and so on; when the virtual tooth No. N0 is obtained, the single pump is driven to operate according to the pre-calibrated driving time; During the period when the monomer pump continues to run until the virtual 2N0 tooth, if the missing tooth signal is still not obtained and the pressure in the common rail pipe rises, the odd multiple of N0 is used as the driving moment of the monomer pump, and the driving duration is N0 tooth signals, and the even multiple of N0 is used as the closing moment of the monomer pump; If the pressure in the common rail pipe does not rise, an even multiple of N0 is used as the driving moment of the monomer pump, an odd multiple of N0 is used as the closing moment of the monomer pump, and the driving duration is N0 tooth signals to increase the pressure of the common rail pipe.

2. A method for rapid pressure building of a single pump common rail as claimed in claim 1, characterized in that: During the period when the single pump continues to run to the virtual 2N0 tooth, if a missing tooth signal is obtained, the single pump is synchronized using the missing tooth signal, and the driving time and driving duration of the single pump are determined according to the current rail pressure demand to increase the pressure of the common rail pipe.

3. A method for rapid pressure building of a single pump common rail as claimed in claim 1, characterized in that: After the single pump is started at least once by odd multiples of N0 and / or even multiples of N0, the tooth signal is continuously obtained. If a missing tooth signal is obtained, the missing tooth signal is used to synchronize the single pump, and the driving time and driving duration of the single pump are determined according to the current rail pressure requirement to increase the pressure of the common rail pipe.

4. A method for rapid pressure building of a single pump common rail as claimed in claim 1, characterized in that: After the monomer pump is started at least once by odd multiples of N0 and / or even multiples of N0, the tooth signal is continuously obtained until the moment of closing the monomer pump is reached. If the engine stops completely, the pressure building process is terminated.

5. A method for rapid pressure building of a single pump common rail as claimed in claim 1, characterized in that: The tooth signal of the monomer pump signal disk is obtained, specifically: the initial state of the engine is the shutdown state, the ECU is powered on and initialized; the engine is started, and the engine crankshaft drives the monomer pump signal disk to run through the camshaft. When the first tooth signal of the monomer pump signal disk is obtained, the tooth signal detection state is entered, and the tooth signal of the monomer pump signal disk is continuously obtained.

6. A method for rapid pressure building of a single pump common rail as claimed in claim 5, characterized in that: During the operation of the unit pump signal disk driven by the engine crankshaft through the camshaft, if the tooth signal of the signal disk is not obtained, the waiting detection state is cut in, and the tooth signal detection state is cut in when the first tooth signal is obtained.

7. A method for rapid pressure building of a single pump common rail as claimed in claim 1, characterized in that: N0=N3 / N1 / N2 / 2, N1 is the number of single pumps controlled by the signal disk, N2 is the number of lobes of the cam in the single pump, and N3 is the total number of teeth on the signal disk.

8. A method for rapid pressure building of a single pump common rail as claimed in claim 1, characterized in that: The missing tooth signal is used to synchronize the unit pump. Specifically, when the signal disk turns to the missing tooth position, a widened pulse signal corresponding to the missing tooth position is sent to the ECU. The ECU determines the relative position between the missing tooth position of the signal disk and the top dead center of the unit pump cam, that is, the number of teeth, based on the widened pulse signal, and obtains the position of the top dead center of the unit pump cam. When the unit pump runs to the top dead center of the cam, fuel injection is executed to boost the common rail pressure.

9. A single pump common rail rapid pressure building device, characterized in that: include: A signal acquisition module, used to obtain the tooth signal of the single pump signal disk and send it to the controller; The controller is configured to: if a missing tooth signal is obtained, synchronize the single pump using the missing tooth signal, and determine the driving time and driving duration of the single pump according to the current rail pressure demand, and increase the pressure of the common rail pipe; The controller is further configured to: before obtaining the missing tooth signal, the first tooth signal obtained is the virtual tooth No. 0, the second tooth signal is the virtual tooth No. 1, and so on; when the virtual tooth No. N0 is obtained, the single pump is driven to operate according to the pre-calibrated driving time; The controller is further configured to: during the period when the monomer pump continues to operate until the virtual 2N0 tooth, if the missing tooth signal is still not obtained and the pressure in the common rail pipe rises, an odd multiple of N0 is used as the driving moment of the monomer pump, and the driving duration is N0 tooth signals, and an even multiple of N0 is used as the closing moment of the monomer pump; The controller is further configured to: if the pressure in the common rail pipe does not rise, use even multiples of N0 as the driving time of the monomer pump, odd multiples of N0 as the closing time of the monomer pump, and the driving duration is N0 tooth signals to increase the pressure of the common rail pipe.

10. A motor vehicle, characterized in that: A common rail pipe and at least one group of monomer pumps for boosting the pressure of the common rail pipe are provided, and a controller of the monomer pump executes the method for quickly building pressure of the common rail of the monomer pump as described in claims 1-8.

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