CN114790981A - Method for preventing short stroke of hydraulic pump of air supply system of HPDI (high performance diesel engine direct) engine - Google Patents

Method for preventing short stroke of hydraulic pump of air supply system of HPDI (high performance diesel engine direct) engine Download PDF

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Publication number
CN114790981A
CN114790981A CN202210419074.3A CN202210419074A CN114790981A CN 114790981 A CN114790981 A CN 114790981A CN 202210419074 A CN202210419074 A CN 202210419074A CN 114790981 A CN114790981 A CN 114790981A
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stroke
compression stroke
pressure
current
buffer tank
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CN202210419074.3A
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CN114790981B (en
Inventor
周飞章
曲怡霖
王毓源
刘盼
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0293—Safety devices; Fail-safe measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/02—External pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Abstract

The invention discloses a method for preventing a hydraulic pump of an air supply system of an HPDI engine from generating short stroke, which comprises the steps of calculating the pressure in a buffer tank after the current compression stroke according to the actual pressure of the buffer tank before the current compression stroke is started, the pressure corresponding to the fuel pumped into the buffer tank in the current compression stroke and the pressure corresponding to the fuel consumed by the engine in the current compression stroke and the current back-pumping stroke; judging whether the pressure in the buffer tank after the current compression stroke is greater than the set maximum bearing pressure of the buffer tank or not, and if the pressure in the buffer tank after the current compression stroke is greater than the set maximum bearing pressure of the buffer tank, not opening the current compression stroke; and if the pressure in the buffer tank after the current compression stroke is less than or equal to the set maximum bearing pressure of the buffer tank, starting the current compression stroke. The hydraulic pump can be prevented from stopping working in the process of a compression stroke and a withdrawal stroke, and the service life of the hydraulic pump can be prolonged.

Description

Method for preventing short stroke of hydraulic pump of air supply system of HPDI (high performance diesel engine direct) engine
Technical Field
The invention relates to the technical field of HPDI engines, in particular to a method for preventing a hydraulic pump of an air supply system of an HPDI engine from short stroke.
Background
The HPDI (High Pressure Direct Injection) engine is a High-power cylinder High-Pressure Direct Injection compression ignition type natural gas engine, uses natural gas as a main fuel, and simultaneously ensures the power, the torque and the efficiency of a crude diesel engine. In the working process of the HPDI engine, the buffer tank provides gas fuel required by the engine, the gas fuel in the buffer tank needs to be kept in a high-pressure state, along with the operation of the engine, the fuel in the buffer tank is continuously reduced, when the pressure is reduced to a certain degree, generally to be reduced to 28MPa, the pressure requirement of the engine on the gas fuel cannot be met, at the moment, the gas fuel in the LNG air tank needs to be continuously pressurized into the buffer tank through a compression stroke and a back-suction stroke of the hydraulic pump, and the maximum bearing pressure of the buffer tank is generally set to be 32MPa until the pressure of the buffer tank reaches the set maximum bearing pressure of the buffer tank. At present, the control method of the engine air supply system is that when the actual pressure of the buffer tank reaches 32Mpa, the hydraulic pump stops working. However, under the general condition, when the actual pressure of buffer tank reached 32Mpa, the hydraulic pump was in compression stroke and the stroke process of pumpback and did not finish the stroke of pumpback, short stroke appears, the hydraulic oil of hydraulic pump releases pressure suddenly this moment, the piston of hydraulic pump finishes the stroke of pumpback fast under the effect of jar internal high pressure gas, the piston atress strikes greatly, the aggravation wearing and tearing, can influence the life-span of hydraulic pump, and if continue to beat gas fuel after the actual pressure of buffer tank reaches 32Mpa and press the buffer tank to the pressure in the buffer tank until the stroke of pumpback finishes then can lead to the pressure in the buffer tank to exceed 32Mpa, the pressure-bearing limit of buffer tank has been exceeded, there is certain potential safety hazard.
Disclosure of Invention
The invention aims to provide a method for preventing a hydraulic pump of an air supply system of an HPDI (high pressure differential ionization) engine from having a short stroke, so as to solve the problem that when the actual pressure of a buffer tank reaches the maximum bearing pressure of a set buffer tank, the hydraulic pump does not finish a back-pumping stroke in the processes of a compression stroke and a back-pumping stroke, and the service life of the hydraulic pump is influenced when the hydraulic pump stops working.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of preventing short trips in a hydraulic pump of an air supply system of an HPDI engine, comprising:
determining the actual pressure P of the buffer tank before the opening of the current compression stroke 0 ；
Estimating the pressure P corresponding to the fuel injected into the buffer tank in the current compression stroke 1 ；
Estimating the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current back-suction stroke 2 ；
According to the actual pressure P of the buffer tank before the current compression stroke is opened 0 The pressure P corresponding to the fuel driven into the buffer tank in the current compression stroke 1 And the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current back-suction stroke 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 ；
Before the current compression stroke is started, judging the pressure P in the buffer tank after the current compression stroke 3 Whether the pressure is greater than the set maximum bearing pressure of the buffer tank or not, and if the pressure P in the buffer tank after the current compression stroke is greater than the set maximum bearing pressure of the buffer tank 3 If the pressure is greater than the set maximum bearing pressure of the buffer tank, the current compression stroke is not started; if the pressure P in the buffer tank after the current compression stroke 3 And if the maximum bearing pressure of the buffer tank is less than or equal to the set maximum bearing pressure, the current compression stroke is started.
As a preferable scheme of the method for preventing the short stroke of the hydraulic pump of the air supply system of the HPDI engine, the actual pressure P of the buffer tank before the opening of the current compression stroke is used as the basis 0 The pressure P corresponding to the fuel driven into the buffer tank in the current compression stroke 1 And the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current extraction stroke 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 The method comprises the following steps: by the formula: p 3 ＝P 0 +P 1 -P 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 。
As a preferable mode of the method for preventing the short stroke of the hydraulic pump of the air supply system of the HPDI engine, the pressure P corresponding to the fuel injected into the buffer tank in the current compression stroke is estimated 1 The method comprises the following steps:
determining the pressure P corresponding to the fuel injected into the buffer tank in the last compression stroke 1 ’；
The pressure P corresponding to the fuel which is injected into the buffer tank by the current compression stroke 1 Equal to the pressure P corresponding to the fuel injected into the buffer tank in the previous compression stroke 1 ’。
As a preferable scheme of the method for preventing the short stroke of the hydraulic pump of the air supply system of the HPDI engine, the pressure P corresponding to the fuel which is driven into the buffer tank in the last compression stroke is determined 1 ' comprising:
determining the increased pressure delta P of the buffer tank in the last compression stroke and the last pumping stroke;
determining the pressure P corresponding to the fuel consumed by the engine during the previous compression stroke and the previous extraction stroke 2 ’；
The pressure P corresponding to the fuel injected into the buffer tank in the previous compression stroke 1 ' is equal to the pressure delta P of the buffer tank increased in the last compression stroke and the last extraction stroke and the pressure P corresponding to the fuel consumed by the engine in the last compression stroke and the last extraction stroke 2 ’。
As a preferable aspect of the above method for preventing a short stroke of a hydraulic pump in an air supply system of an HPDI engine, the determining the pressure Δ P of the buffer tank increase in the previous compression stroke and the previous suction stroke includes:
the increased pressure delta P of the buffer tank in the last compression stroke and the last pumping stroke is equal to the actual pressure P of the buffer tank before the opening of the current compression stroke 0 Subtracting the actual pressure P of the buffer tank before the last compression stroke is opened 0 ’。
As a preferable mode of the method for preventing the short stroke of the hydraulic pump of the air supply system of the HPDI engine, the pressure P corresponding to the fuel consumed by the engine in the previous compression stroke and the previous suction stroke is determined 2 ' comprising:
determining the total fuel consumption of the last compression stroke and the last back-extraction stroke;
obtaining the corresponding pressure P of the fuel consumed by the engine in the last compression stroke and the last back-suction stroke according to the total fuel consumption of the last compression stroke and the last back-suction stroke and the ideal gas state equation 2 ’。
As a preferable aspect of the above method for preventing a short stroke of a hydraulic pump in an air supply system of an HPDI engine, the determining of the total fuel consumption amount of the previous compression stroke and the previous back-suction stroke includes:
determining the total duration of the previous compression stroke and the previous pumpback stroke and the fuel consumption rate of the previous compression stroke and the previous pumpback stroke;
the total fuel consumption of the previous compression stroke and the previous withdrawal stroke is equal to the total duration of the previous compression stroke and the previous withdrawal stroke multiplied by the fuel consumption rate of the previous compression stroke and the previous withdrawal stroke.
As a preferable mode of the above method for preventing the short stroke of the hydraulic pump of the air supply system of the HPDI engine, the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current suction stroke is estimated 2 The method comprises the following steps:
determining the total fuel consumption of the current compression stroke and the current back-suction stroke;
obtaining the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current back-suction stroke according to the total fuel consumption of the current compression stroke and the current back-suction stroke and an ideal gas state equation 2 。
As a preferable mode of the above method for preventing a short stroke of a hydraulic pump of an air supply system of an HPDI engine, the determining of the total fuel consumption amount of the current compression stroke and the current withdrawal stroke includes:
determining the total duration of the current compression stroke and the current back-pumping stroke and the fuel consumption rates of the current compression stroke and the current back-pumping stroke;
the total fuel consumption of the current compression stroke and the current withdrawal stroke is equal to the total duration of the current compression stroke and the current withdrawal stroke multiplied by the fuel consumption rate of the current compression stroke and the current withdrawal stroke.
As a preferable aspect of the above method for preventing a short stroke of a hydraulic pump of an air supply system of an HPDI engine, the determining of the total duration of the current compression stroke and the current back-extraction stroke and the fuel consumption rates of the current compression stroke and the current back-extraction stroke includes:
the total duration of the current compression stroke and the current pumpback stroke is equal to the total duration of the last compression stroke and the last pumpback stroke; the fuel consumption rates of the current compression stroke and the current withdrawal stroke are equal to the maximum fuel consumption rate calibrated by the engine.
The invention has the beneficial effects that:
the invention aims to provide a method for preventing a hydraulic pump of an air supply system of an HPDI (high pressure differential ionization) engine from having a short stroke, wherein in the method for preventing the hydraulic pump of the air supply system of the HPDI engine from having the short stroke, the pressure in a buffer tank after the current compression stroke is calculated according to the actual pressure of the buffer tank before the current compression stroke is started, the pressure corresponding to the fuel injected into the buffer tank in the current compression stroke and the pressure corresponding to the fuel consumed by the engine in the current compression stroke and the current pumpback stroke; before the current compression stroke is started, the pressure P in the buffer tank after the current compression stroke is judged 3 Whether the pressure is larger than the set maximum bearing pressure of the buffer tank or not, if the pressure P in the buffer tank after the current compression stroke is larger than the set maximum bearing pressure of the buffer tank 3 If the pressure is higher than the set maximum bearing pressure of the buffer tank, the current compression stroke is not started; if the pressure P in the buffer tank after the current compression stroke 3 And if the maximum bearing pressure of the buffer tank is less than or equal to the set maximum bearing pressure, the current compression stroke is started. When the calculated pressure in the buffer tank after the current compression stroke is larger than the set bufferWhen dashing jar maximum bearing pressure, if carry out current compression stroke, then in fact the pressure in the buffer tank behind the current compression stroke has greatly probably to be greater than the biggest bearing pressure of settlement buffer tank, has certain potential safety hazard. In addition, if the current compression stroke is performed, when the pressure in the buffer tank is equal to the maximum bearing pressure of the set buffer tank, the current compression stroke and the current pumping stroke are not finished, the piston of the hydraulic pump may stop at the middle position, and a short stroke occurs, so that the service life of the hydraulic pump is reduced. Therefore, if the pressure in the buffer tank after the current compression stroke is greater than the set maximum bearing pressure of the buffer tank, the current compression stroke is not started, and if the pressure in the buffer tank after the current compression stroke is less than or equal to the set maximum bearing pressure of the buffer tank, the current compression stroke is started. The hydraulic pump can be prevented from being influenced by short stroke. And on the basis of the configuration of the existing engine, whether the hydraulic pump has a short stroke or not can be judged only through the calculation of the ECU without other equipment, so that the service life of the hydraulic pump is prolonged.
Drawings
FIG. 1 is a flow chart of a method of preventing short trips in a hydraulic pump of an air supply system of an HPDI engine provided in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.
The invention provides a method for preventing a hydraulic pump of an air supply system of an HPDI engine from short stroke, which comprises the following steps:
determining the actual pressure P of the buffer tank before the opening of the current compression stroke 0 。
It will be appreciated that a pressure sensor is provided on the buffer tank. The actual pressure P of the buffer tank before the opening of the current compression stroke is detected by a pressure sensor of the buffer tank 0 。
Estimating the pressure P corresponding to the fuel injected into the buffer tank in the current compression stroke 1 。
Specifically, the pressure P corresponding to the fuel driven into the surge tank at the present compression stroke 1 Equal to the pressure P corresponding to the fuel injected into the buffer tank in the previous compression stroke 1 '. It is understood that the pressure corresponding to the fuel that is driven into the surge tank in the compression stroke is affected by the efficiency of the hydraulic pump, the back pressure, and the flow rate of the hydraulic oil, and the pressure corresponding to the fuel that is driven into the surge tank in the compression stroke is not fixed in practice. So that the pressure P corresponding to the fuel injected into the surge tank in the previous compression stroke 1 ' pressure P corresponding to fuel to be driven into surge tank closest to current compression stroke 1 。
It will be appreciated that the pressure increase in the surge tank during the compression stroke and the retraction stroke is equal to the pressure corresponding to the fuel being driven into the surge tank for the compression stroke minus the pressure corresponding to the fuel being consumed by the engine during the compression stroke and the retraction stroke. Therefore, the pressure P corresponding to the fuel driven into the surge tank in the previous compression stroke 1 Equal to the pressure Δ P of the buffer tank increase in the previous compression stroke and the previous withdrawal stroke plus the pressure P corresponding to the fuel consumed by the engine in the compression stroke and the previous withdrawal stroke 2 ', i.e. P 1 ’＝ΔP+P 2 ’。
Specifically, the increased pressure Δ P of the buffer tank in the last compression stroke and the last pumpback stroke is equal to the actual pressure P of the buffer tank before the current compression stroke is opened 0 Minus the actual pressure P of the buffer vessel before opening of the previous compression stroke 0 ', i.e. Δ P ═ P 0 -P 0 '. Actual pressure P of buffer tank before opening of current compression stroke 0 And the actual pressure P of the buffer tank before the last compression stroke is opened 0 ' are detected by a pressure sensor of the buffer tank.
Specifically, the pressure P corresponding to the fuel consumed by the engine in the previous compression stroke and the previous back-suction stroke is obtained according to the total fuel consumption of the previous compression stroke and the previous back-suction stroke and the ideal gas state equation 2 '. Wherein the ideal gas state equation is: PV ═ mRT, where: p is the pressure corresponding to the fuel consumed by the engine in the compression stroke and the back-suction stroke; v is the volume of the buffer tank; m is the total fuel consumption of the compression stroke and the back-suction stroke; r is a gas constant, which is a constant related to the gas species; t is the temperature of the buffer tank. Wherein the content of the first and second substances,the total fuel consumption of the previous compression stroke and the previous withdrawal stroke is equal to the total duration of the previous compression stroke and the previous withdrawal stroke multiplied by the fuel consumption rate of the previous compression stroke and the previous withdrawal stroke. It is to be understood that the total duration of the previous compression stroke and the previous withdrawal stroke and the fuel consumption rates of the previous compression stroke and the previous withdrawal stroke are calculated by the ECU. The temperature of the buffer tank may be detected by a temperature sensor provided in the buffer tank. Therefore, in the ideal gas state equation, the volume V of the buffer tank, the total fuel consumption m of the compression stroke and the withdrawal stroke, the gas constant R and the temperature T of the buffer tank can be known, and the pressure P corresponding to the fuel consumed by the engine in the previous compression stroke and the previous withdrawal stroke can be obtained through the ideal gas state equation 2 ’。
Estimating the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current extraction stroke 2 。
Specifically, according to the total fuel consumption of the current compression stroke and the current withdrawal stroke and the ideal gas state equation, the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the withdrawal stroke is obtained 2 . Wherein the ideal gas state equation is: PV ═ mRT, where: p is the pressure corresponding to the fuel consumed by the engine in the compression stroke and the back-suction stroke; v is the volume of the buffer tank; m is the total fuel consumption of the compression stroke and the back-suction stroke; r is a gas constant, which is a constant related to the gas species; t is the temperature of the buffer tank. Wherein the total fuel consumption of the current compression stroke and the current withdrawal stroke is equal to the total duration of the current compression stroke and the current withdrawal stroke multiplied by the fuel consumption rates of the current compression stroke and the current withdrawal stroke. It is to be understood that the total duration of the current compression stroke and the current withdrawal stroke and the fuel consumption rates of the current compression stroke and the current withdrawal stroke are calculated by the ECU. The temperature of the buffer tank may be detected by a temperature sensor provided in the buffer tank. Thus, the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current pumpback stroke can be obtained through the ideal gas state equation 2 。
Since the total duration of the current compression stroke and the current withdrawal stroke and the fuel consumption rates of the current compression stroke and the current withdrawal stroke are unknown, the total duration of the previous compression stroke and the previous withdrawal stroke is used as the total duration of the current compression stroke and the current withdrawal stroke, and the total duration of the previous compression stroke and the previous withdrawal stroke can be estimated more accurately. The fuel consumption rates of the current compression stroke and the current back-suction stroke adopt the maximum fuel consumption rate calibrated by the engine. The calculated pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the back-suction stroke can be obtained 2 For its maximum estimated value.
Opening the actual pressure P of the front buffer tank according to the current compression stroke 0 Pressure P corresponding to fuel injected into buffer tank at present compression stroke 1 And the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current pumpback stroke 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 。
Specifically, by the formula: p is 3 ＝P 0 +P 1 -P 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 。
Before the current compression stroke is started, the pressure P in the buffer tank after the current compression stroke is judged 3 Whether the pressure is greater than the set maximum bearing pressure of the buffer tank or not, and if the pressure P in the buffer tank after the current compression stroke is greater than the set maximum bearing pressure of the buffer tank 3 If the pressure is higher than the set maximum bearing pressure of the buffer tank, the current compression stroke is not started; if the pressure P in the buffer tank after the current compression stroke 3 And if the pressure is less than or equal to the set maximum bearing pressure of the buffer tank, the current compression stroke is started.
The fuel consumption rates of the current compression stroke and the current withdrawal stroke adopt the maximum fuel consumption rate calibrated by the engine, and the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the withdrawal stroke is obtained by calculation 2 For its maximum estimated value, and thus the calculated pressure P in the buffer vessel after the current compression stroke 3 For a minimum estimated value, the pressure P in the buffer tank after the current compression stroke is calculated 3 When being greater than the maximum bearing pressure of the set buffer tank, if the current compression stroke is carried out, the pressure in the buffer tank after the current compression stroke is actually greatly possibly greater than the maximum bearing pressure of the set buffer tank, and certain potential safety hazards are generated. In addition, if the current compression stroke is performed, when the pressure in the buffer tank is equal to the maximum bearing pressure of the set buffer tank, the current compression stroke and the current pumping stroke are not finished, the piston of the hydraulic pump may stop at the middle position, and a short stroke occurs, so that the service life of the hydraulic pump is reduced. Therefore, if the pressure P in the surge tank after the current compression stroke 3 If the pressure P is higher than the maximum bearing pressure of the set buffer tank, the current compression stroke is not opened, and if the pressure P in the buffer tank after the current compression stroke is higher than the maximum bearing pressure of the set buffer tank, the pressure P in the buffer tank is not opened 3 And if the maximum bearing pressure of the buffer tank is less than or equal to the set maximum bearing pressure, the current compression stroke is started. The hydraulic pump can be prevented from being influenced by short stroke. On the basis of the existing engine configuration, whether the hydraulic pump has a short stroke or not can be judged only through ECU calculation without other equipment, and the service life of the hydraulic pump is prolonged.
It is understood that the operation is performed until the actual pressure of the hydraulic pump is reduced to 28Mpa or less and then the hydraulic pump is turned on.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A method of preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine, comprising:
determining the actual pressure P of the buffer tank before the opening of the current compression stroke 0 ；
Predict the current compression stroke and drive into the buffer tankPressure P corresponding to fuel 1 ；
Estimating the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current back-suction stroke 2 ；
According to the actual pressure P of the buffer tank before the current compression stroke is opened 0 The pressure P corresponding to the fuel injected into the buffer tank in the current compression stroke 1 And the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current extraction stroke 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 ；
Before the current compression stroke is started, judging the pressure P in the buffer tank after the current compression stroke 3 Whether the pressure is greater than the set maximum bearing pressure of the buffer tank or not, if the pressure P in the buffer tank after the current compression stroke is greater than the set maximum bearing pressure of the buffer tank 3 If the pressure is higher than the set maximum bearing pressure of the buffer tank, the current compression stroke is not started; if the pressure P in the buffer tank after the current compression stroke 3 And if the maximum bearing pressure of the set buffer tank is less than or equal to the maximum bearing pressure of the set buffer tank, the current compression stroke is started.
2. A method of preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine according to claim 1, characterized in that the actual pressure P of the surge tank before opening according to the current compression stroke is determined 0 The pressure P corresponding to the fuel injected into the buffer tank in the current compression stroke 1 And the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current back-suction stroke 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 The method comprises the following steps: by the formula: p 3 ＝P 0 +P 1 -P 2 Calculating the pressure P in the buffer tank after the current compression stroke 3 。
3. The method for preventing short stroke of hydraulic pump in air supply system of HPDI engine as claimed in claim 1 wherein the estimated pressure P corresponding to fuel driven into buffer tank at current compression stroke is estimated 1 The method comprises the following steps:
is determined atPressure P corresponding to fuel having one compression stroke and being driven into buffer tank 1 ’；
The pressure P corresponding to the fuel which is injected into the buffer tank by the current compression stroke 1 Equal to the pressure P corresponding to the fuel injected into the buffer tank in the previous compression stroke 1 ’。
4. A method of preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine as claimed in claim 3, wherein the pressure P corresponding to the fuel that was driven into the surge tank in the previous compression stroke is determined 1 ' comprising:
determining the increased pressure delta P of the buffer tank in the last compression stroke and the last pumping stroke;
determining the pressure P corresponding to the fuel consumed by the engine during the previous compression stroke and the previous extraction stroke 2 ’；
The pressure P corresponding to the fuel injected into the buffer tank in the previous compression stroke 1 ' is equal to the pressure delta P of the buffer tank increased in the last compression stroke and the last extraction stroke and the pressure P corresponding to the fuel consumed by the engine in the last compression stroke and the last extraction stroke 2 ’。
5. The method of preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine as recited in claim 4 wherein said determining the pressure Δ P of the surge tank increase during the last compression stroke and the last retraction stroke comprises:
the increased pressure delta P of the buffer tank in the last compression stroke and the last pumping stroke is equal to the actual pressure P of the buffer tank before the current compression stroke is opened 0 Minus the actual pressure P of the buffer vessel before opening of the previous compression stroke 0 ’。
6. A method of preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine as claimed in claim 4 wherein the pressure P corresponding to the fuel consumed by the engine in the previous compression stroke and the previous retraction stroke is determined 2 ' comprising:
determining the total fuel consumption of the last compression stroke and the last back-suction stroke;
obtaining the corresponding pressure P of the fuel consumed by the engine in the last compression stroke and the last back-suction stroke according to the total fuel consumption of the last compression stroke and the last back-suction stroke and the ideal gas state equation 2 ’。
7. The method of preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine as recited in claim 6 wherein said determining the total fuel consumption of the previous compression stroke and the previous retraction stroke comprises:
determining the total duration of the previous compression stroke and the previous pumpback stroke and the fuel consumption rate of the previous compression stroke and the previous pumpback stroke;
the total fuel consumption of the previous compression stroke and the previous withdrawal stroke is equal to the total duration of the previous compression stroke and the previous withdrawal stroke multiplied by the fuel consumption rate of the previous compression stroke and the previous withdrawal stroke.
8. The method for preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine as recited in claim 1, wherein the pressure P corresponding to fuel consumed by the engine in the current compression stroke and the current pumpback stroke is estimated 2 The method comprises the following steps:
determining the total fuel consumption of the current compression stroke and the current back-suction stroke;
obtaining the pressure P corresponding to the fuel consumed by the engine in the current compression stroke and the current extraction stroke according to the total fuel consumption and the ideal gas state equation of the current compression stroke and the current extraction stroke 2 。
9. The method of preventing short strokes of a hydraulic pump in an air supply system of an HPDI engine as recited in claim 8 wherein said determining the total fuel consumption for the current compression stroke and the current pumpback stroke comprises:
determining the total duration of the current compression stroke and the current back-pumping stroke and the fuel consumption rates of the current compression stroke and the current back-pumping stroke;
the total fuel consumption of the current compression stroke and the current withdrawal stroke is equal to the total duration of the current compression stroke and the current withdrawal stroke multiplied by the fuel consumption rate of the current compression stroke and the current withdrawal stroke.
10. The method of preventing short strokes of an HPDI engine air supply system hydraulic pump according to claim 9, wherein the determining the total duration of the current compression stroke and the current pumpback stroke and the fuel consumption rates of the current compression stroke and the current pumpback stroke comprises:
the total duration of the current compression stroke and the current pumpback stroke is equal to the total duration of the last compression stroke and the last pumpback stroke; the fuel consumption rates of the current compression stroke and the current withdrawal stroke are equal to the maximum fuel consumption rate calibrated by the engine.
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