CN108087135B - Control method and device for dual-fuel vehicle - Google Patents

Control method and device for dual-fuel vehicle Download PDF

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Publication number
CN108087135B
CN108087135B CN201711348494.2A CN201711348494A CN108087135B CN 108087135 B CN108087135 B CN 108087135B CN 201711348494 A CN201711348494 A CN 201711348494A CN 108087135 B CN108087135 B CN 108087135B
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fuel
current
control signal
dual
ecu
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CN108087135A (en
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祁克光
杨俊伟
全书鹏
李东敦
邓永娣
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Chery Automobile Co Ltd
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Chery Automobile Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2438—Active learning methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/1502—Digital data processing using one central computing unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention discloses a control method and a control device for a dual-fuel vehicle, and belongs to the field of vehicle electronic control. The method comprises the following steps: the terminal determines the current fuel of an engine in the dual-fuel vehicle through the ECU; according to the current fuel, obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel; acquiring a self-learning coefficient of the control signal from a storage space of the ECU; and controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal. The terminal can identify the current fuel and acquire the control signal corresponding to the current fuel based on the fuel identification of the current fuel, so that the accuracy of controlling the dual-fuel vehicle is improved.

Description

Control method and device for dual-fuel vehicle
Technical Field
The invention relates to the technical field of vehicle electronic control, in particular to a control method and a control device for a dual-fuel vehicle.
Background
It is well known that gasoline is the primary fuel for most vehicles. However, with the continuous development and utilization of natural gas resources, natural gas is becoming one of the main fuels of vehicles due to its low use cost. In many dual fuel vehicles, both gasoline and natural gas may be used as the fuel for power. During the running of the dual-fuel vehicle, when the gasoline is insufficient, the dual-fuel vehicle can switch to use natural gas as the fuel for power supply.
In the existing dual-fuel vehicle, a natural gas controller is usually added in the original vehicle using gasoline as fuel, when the fuel of the dual-fuel vehicle needs to be switched from gasoline to natural gas, the dual-fuel vehicle acquires control signals such as the injection amount and/or the ignition angle of an oil nozzle in the gasoline controller through the controller of the natural gas, and inputs the control signals into the natural gas controller as the control signals of the natural gas controller, so that the dual-fuel vehicle provides power through the combustion of the natural gas.
In the related art, in the process of implementing the present invention, the inventors found that at least the following problems exist in the related art:
the above process actually directly uses the control signal in the gasoline controller to control the natural gas, however, because there is a large difference between the physical properties of the gasoline and the natural gas, the control signal of the gasoline controller may not conform to the physical properties of the natural gas, so that the accuracy in controlling the vehicle is poor.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides a control method and a control device of a dual-fuel vehicle. The technical scheme is as follows:
in a first aspect, a control method for a dual-fuel vehicle is provided, the method being applied in a dual-fuel vehicle, the dual-fuel vehicle comprising at least one electronic controller ECU, the method comprising:
determining, by the ECU, a current fuel of an engine in the dual-fuel vehicle;
acquiring a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal according to the current fuel, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel;
acquiring a self-learning coefficient of the control signal from a storage space of the ECU;
and controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal.
In one possible design, the dual-fuel vehicle further comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein the oil nozzle and the air injection valve are both connected with the ECU;
the low side of the air injection valve is connected with the ECU, and the high side of the air injection valve is connected with the H bridge; the method further comprises the following steps:
and when a closing command for controlling the gas injection valve is received, closing the gas injection valve through the H bridge.
In a possible design, the obtaining, according to the current fuel, a control signal corresponding to the current fuel from a correspondence between a fuel identifier and the control signal includes:
acquiring a calibration table corresponding to the current fuel according to the current fuel;
and acquiring the current rotating speed and the current air inflow of the dual-fuel vehicle, searching control signals corresponding to the current fuel at the current rotating speed and the current air inflow from the calibration table, and storing a fuel identifier of the fuel and the control signals corresponding to the fuel at a plurality of rotating speeds and a plurality of air inflow in the calibration table in an associated manner.
In one possible design, after the controlling the engine to operate with the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal, the method further includes:
acquiring a current voltage signal of an oxygen sensor of the dual-fuel vehicle through the ECU;
according to the current voltage signal, determining a self-learning coefficient of a current control signal corresponding to the control signal of the dual-fuel vehicle under the current voltage signal from a corresponding relation of the self-learning coefficients of the voltage signal and the control signal;
storing the self-learning coefficients of the current control signal into a memory space of the ECU.
In one possible design, the determining, by the ECU, a current fuel of an engine in the dual fuel vehicle includes:
acquiring a current mark signal of a mark bit of the dual-fuel vehicle through the ECU;
and determining a fuel identifier corresponding to the current mark signal from the corresponding relation between the mark signal and the fuel identifier according to the current mark signal, and determining the fuel corresponding to the fuel identifier as the current fuel of the engine.
In a second aspect, a control device for a dual-fuel vehicle is provided, the device being used in a dual-fuel vehicle, the dual-fuel vehicle including at least one electronic controller ECU, the device comprising:
a determination module for determining, by the ECU, a current fuel of an engine in the dual-fuel vehicle;
the first obtaining module is used for obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and a control signal according to the current fuel, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel;
the second acquisition module is used for acquiring a self-learning coefficient of the control signal from a storage space of the ECU;
and the control module is used for controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal.
In one possible design, the dual-fuel vehicle further comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein the oil nozzle and the air injection valve are both connected with the ECU;
the low side of the air injection valve is connected with the ECU, and the high side of the air injection valve is connected with the H bridge; the device further comprises:
and the closing module is used for closing the air injection valve through the H bridge when receiving a closing instruction for controlling the air injection valve.
In a possible design, the first obtaining module is further configured to obtain a calibration table corresponding to the current fuel according to the current fuel; and acquiring the current rotating speed and the current air inflow of the dual-fuel vehicle, searching control signals corresponding to the current fuel at the current rotating speed and the current air inflow from the calibration table, and storing a fuel identifier of the fuel and the control signals corresponding to the fuel at a plurality of rotating speeds and a plurality of air inflow in the calibration table in an associated manner.
In one possible design, the apparatus further includes:
the third acquisition module is used for acquiring a current voltage signal of an oxygen sensor of the dual-fuel vehicle through the ECU;
the determining module is further used for determining the self-learning coefficient of the current control signal corresponding to the control signal of the dual-fuel vehicle under the current voltage signal from the corresponding relation of the self-learning coefficients of the voltage signal and the control signal according to the current voltage signal;
and the storage module is used for storing the self-learning coefficient of the current control signal into the storage space of the ECU.
In one possible design, the determining module is further configured to obtain, by the ECU, a current flag signal of a flag bit of the dual-fuel vehicle; and determining a fuel identifier corresponding to the current mark signal from the corresponding relation between the mark signal and the fuel identifier according to the current mark signal, and determining the fuel corresponding to the fuel identifier as the current fuel of the engine.
In the embodiment of the invention, the terminal determines the current fuel of the engine in the dual-fuel vehicle through the ECU; according to the current fuel, obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel; acquiring a self-learning coefficient of the control signal from a storage space of the ECU; and controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal. The terminal can identify the current fuel and acquire the control signal corresponding to the current fuel based on the fuel identification of the current fuel, so that the accuracy of controlling the dual-fuel vehicle is improved.
Drawings
FIG. 1 is a flow chart of a control method for a dual fuel vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method for a dual fuel vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control structure provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a control structure provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a control process for a gas injection valve according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a control structure provided by an embodiment of the present invention;
fig. 7 is a block diagram of a control device of a dual-fuel vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method for a dual-fuel vehicle, which is provided by an embodiment of the present invention, and is applied to the dual-fuel vehicle, where the dual-fuel vehicle includes at least one electronic controller ECU, an execution subject of the method may be a terminal, and the terminal may be an on-board terminal, as shown in fig. 1, and the method includes:
step 101: determining, by the ECU, a current fuel of an engine in the dual-fuel vehicle;
step 102: according to the current fuel, obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel;
step 103: acquiring a self-learning coefficient of the control signal from a storage space of the ECU;
step 104: and controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal.
In one possible design, the dual-fuel vehicle further comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein the oil nozzle and the air injection valve are both connected with the ECU;
wherein, the low side of the air injection valve is connected with the ECU, and the high side of the air injection valve is connected with the H bridge; the method further comprises the following steps:
when a closing command for controlling the gas injection valve is received, the gas injection valve is closed through the H-bridge.
In a possible design, the obtaining a control signal corresponding to the current fuel from a correspondence between a fuel identifier and a control signal according to the current fuel includes:
obtaining a calibration table corresponding to the current fuel according to the current fuel;
the method comprises the steps of obtaining the current rotating speed and the current air inflow of the dual-fuel vehicle, searching control signals corresponding to the current rotating speed and the current air inflow of the current fuel from a calibration table, and storing a fuel identification of the fuel and the control signals corresponding to the fuel at a plurality of rotating speeds and a plurality of air inflow in the calibration table in a related mode.
In one possible design, after the controlling the engine to operate with the control signal and the self-learning coefficient of the control signal based on the control signal and the self-learning coefficient of the control signal, the method further includes:
acquiring a current voltage signal of an oxygen sensor of the dual-fuel vehicle through the ECU;
according to the current voltage signal, determining a self-learning coefficient of a current control signal corresponding to the control signal of the dual-fuel vehicle under the current voltage signal from a corresponding relation of the self-learning coefficients of the voltage signal and the control signal;
storing the self-learning coefficients of the current control signal into a memory space of the ECU.
In one possible design, the determining, by the ECU, a current fuel of an engine in the dual fuel vehicle includes:
acquiring a current mark signal of a mark bit of the dual-fuel vehicle through the ECU;
and according to the current mark signal, determining a fuel mark corresponding to the current mark signal from the corresponding relation between the mark signal and the fuel mark, and determining the fuel corresponding to the fuel mark as the current fuel of the engine.
In the embodiment of the invention, the terminal determines the current fuel of the engine in the dual-fuel vehicle through the ECU; according to the current fuel, obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel; acquiring a self-learning coefficient of the control signal from a storage space of the ECU; and controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal. The terminal can identify the current fuel and acquire the control signal corresponding to the current fuel based on the fuel identification of the current fuel, so that the accuracy of controlling the dual-fuel vehicle is improved.
Fig. 2 is a flowchart of a Control method for a dual-fuel vehicle, which is provided by an embodiment of the present invention, and the method is applied to the dual-fuel vehicle, where the dual-fuel vehicle includes at least one ECU (electronic Control Unit), an execution subject of the method may be a terminal, and the terminal may be an on-board terminal, as shown in fig. 2, and the method includes:
step 201: the terminal determines, via the ECU, the current fuel of the engine in the dual fuel vehicle.
In the embodiment of the invention, the dual-fuel vehicle can use gasoline as fuel to provide power, and can also use natural gas as fuel to provide power. The dual-fuel vehicle also comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein as shown in figure 3, the oil nozzle and the air injection valve are both connected with the ECU; the terminal can control an air injection valve and an oil injection nozzle through the ECU, wherein the lower side of the air injection valve is connected with the ECU, and the higher side of the air injection valve is connected with an H bridge; when a closing command for controlling the gas injection valve is received, the gas injection valve is closed through the H-bridge.
It should be noted that, in practical use, the process of controlling the air injection valve by the ECU may be: controlling the air injection valve to be opened, controlling the air injection valve to inject air normally, and controlling the air injection valve to be closed. However, generally, as shown in fig. 4, the lower side of the gas injection valve is generally connected with the ECU, the higher side is generally connected with the power supply, the gas injection valve requires Peak current to normally open and Discharge current to normally close, and the relationship between the control processes and the current of the gas injection valve is generally closed when the Discharge current is generally 0.7A as shown in fig. 5. However, the air injection valve is aged along with the increase of the use times, the aged air injection valve can delay the Discharge current, namely, the air injection valve cannot be closed in time when the Discharge current is 0.7A, the current is continuously reduced to 0.3A, the closing of the air injection valve can be realized, the air injection time of the air injection valve is prolonged, and the ECU cannot accurately control the air injection valve. For example, during idling of the dual-fuel vehicle, the air injection time is prolonged, so that the air injection amount is too large, and the dual-fuel vehicle is unstable in idling and even stalls.
In the embodiment of the invention, as shown in fig. 6, the high side of the air injection valve is connected with the H bridge, and the low side is still connected with the ECU, and the H bridge is actually a direct current motor control circuit, so that the conversion between direct current and alternating current can be realized. When the gas injection valve needs to be closed by the dual-fuel vehicle, the terminal can control the opening and closing of the H bridge, so that the high side of the gas injection valve is controlled to carry out instantaneous pressure drop, the current in the gas injection valve is rapidly reduced, even if the gas injection valve is aged, delay cannot be generated, accurate control of the ECU to the gas injection is realized, and the switching process of fuel in the dual-fuel vehicle can be accurately controlled by the terminal.
As shown in fig. 6, the terminal may be provided with an H-bridge connected to one gas injection valve, and each H-bridge corresponds to only one gas injection valve. The terminal can also be provided with two or more air injection valves connected with an H bridge, and the driving of the air injection valves can be simultaneously controlled by the H bridge, so that the control cost is saved.
In this step, when the dual-fuel vehicle uses different fuels, the flag signals of the flag bits of the dual-fuel vehicle are different. The terminal can determine the currently used fuel by detecting the flag signal of the flag bit.
Therefore, this step can be realized by the following step 2011-.
Step 2011: and the terminal acquires the current mark signal of the mark position of the dual-fuel vehicle through the ECU.
In the embodiment of the invention, the flag bit of the dual-fuel vehicle is used for indicating the fuel identification of the currently used fuel, and the flag bit of the dual-fuel vehicle can be an enabling flag bit of any fuel. Specifically, the terminal may set an enable flag bit of a fuel through an ECU of the dual-fuel vehicle, and store flag signals corresponding to different fuels under the enable flag bit in a designated storage space of the ECU in an associated manner, and when an engine in the dual-fuel vehicle uses any fuel, the ECU may set the enable flag bit as the flag signal corresponding to the fuel. The terminal can determine the fuel currently used by the dual-fuel vehicle according to the flag signal of the enabling flag bit of the fuel.
Taking the flag bit of the dual-fuel vehicle as the enabling flag bit of the natural gas as an example, the terminal obtains the current flag signal of the enabling flag bit of the fuel through the ECU, and determines the current flag signal of the enabling flag bit of the fuel as the current flag bit signal of the flag bit of the dual-fuel vehicle.
For example, the ECU may define the enable flag for natural gas as B _ cngvopn, which the ECU resets when gasoline is used: b _ cngvopan is 0, i.e. the current flag signal is 0; when using the same natural gas, the ECU sets the enable flag position: b _ cngvopan is 1, i.e., the current flag signal is 1. The fuel identifier may be set and changed according to the user's needs, which is not specifically limited in the embodiment of the present invention. For example, the fuel identification may be the name of the fuel.
Step 2012: and the terminal determines the fuel identifier corresponding to the current mark signal from the corresponding relation between the mark signal and the fuel identifier according to the current mark signal, and determines the fuel corresponding to the fuel identifier as the current fuel of the engine.
The terminal can set and associate and store the fuel identification of each fuel and the zone bit signal corresponding to the fuel in advance, when the terminal obtains the current zone signal, the terminal obtains the corresponding relation between the fuel identification and the zone signal from the designated storage space of the ECU, and obtains the fuel identification corresponding to the current zone signal from the corresponding relation between the fuel identification and the zone signal according to the current zone signal, wherein the fuel corresponding to the fuel identification is the current fuel which is being used by the dual-fuel vehicle.
For example, when the ECU defines the enable flag bit of natural gas as B _ cngvopn, if the terminal detects that the current flag signal is 0, the current fuel may be gasoline; if the terminal detects that the current flag is 1, the current fuel may be natural gas.
Step 202: and the terminal acquires a control signal corresponding to the current fuel from the corresponding relation between the fuel identification and the control signal according to the current fuel, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel.
In the embodiment of the invention, the terminal can calibrate the corresponding injection quantity, the ignition angle and the torque of the dual-fuel vehicle at different rotating speeds and air intake amounts in advance through experiments, and record the corresponding control signals of the calibrated fuel at a plurality of rotating speeds and a plurality of air intake amounts in a calibration table. And storing the calibration table corresponding to each fuel in a designated storage space, so that each fuel can correspond to one calibration table.
This step can be realized by the following steps 2021-2022.
Step 2021: and the terminal acquires a calibration table corresponding to the current fuel according to the current fuel.
In this step, the terminal selects the calibration table corresponding to the fuel identifier from the designated storage space according to the fuel identifier of the current fuel, and determines the selected calibration table as the calibration table corresponding to the current fuel.
Step 2022: and the terminal acquires the current rotating speed and the current air inflow of the dual-fuel vehicle, and searches the control signal corresponding to the current rotating speed and the current air inflow of the current fuel from the calibration table.
Wherein, the calibration table is used for storing control signals corresponding to the fuel at a plurality of rotating speeds and a plurality of air intake quantities in a related manner. And the terminal acquires the current rotating speed and the current air inflow of the dual-fuel vehicle every other preset period through the ECU, selects the control signal corresponding to the current air inflow and the current rotating speed in the calibration table corresponding to the fuel according to the current rotating speed and the current air inflow, and takes the selected control signal as the control signal of the current fuel.
The preset period may be set and changed according to a user requirement, which is not specifically limited in the embodiment of the present invention. For example, the preset period may be 30 seconds, 2 minutes, or the like.
Furthermore, the terminal can also calibrate corresponding control signals under a plurality of rotating speeds and a plurality of air intake amounts when different air-fuel ratios are calibrated in advance through experiments based on the air-fuel ratio of the engine, and store the corresponding relation among the air-fuel ratio, the rotating speed, the air intake amount and the control signals in a calibration table of each fuel. In actual use, fuel combustion conditions in the engine are different when the air-fuel ratio is different, and in order to reduce unnecessary waste, the air-fuel ratio of the engine can be set to be a specified air-fuel ratio when fuel combustion is complete. The step of the terminal looking up the control signal corresponding to the current fuel at the current rotation speed and the current intake air amount from the calibration table may further be: and the terminal acquires a control signal corresponding to the current rotating speed and the current air inflow of the fuel under the specified air-fuel ratio from the calibration table.
Generally, when the air-fuel ratio is 1, the fuel in the engine is completely combusted, and the terminal can search the current injection quantity, the ignition angle and/or the torque of the fuel corresponding to the current rotating speed and the current air intake quantity when the air-fuel ratio is 1 from a calibration table.
Step 203: the terminal obtains the self-learning coefficient of the control signal from the storage space of the ECU.
In the embodiment of the invention, the terminal stores the self-learning coefficient of the control signal of the fuel during the historical control of the fuel combustion in advance, and the self-learning coefficient is actually the adjusting coefficient required by the terminal to adjust the control signal of the fuel according to the air-fuel ratio and the specified air-fuel ratio.
It should be noted that the terminal can perform self-learning through the air-fuel ratio when controlling the fuel each time, so as to complete the fuel combustion on the premise of ensuring the system performance, thereby reducing the waste and saving the fuel cost. The self-learning process is actually that the terminal judges the current combustion condition of the fuel by testing the air-fuel ratio in real time and continuously adjusts the control signal based on the combustion condition so as to ensure that the fuel is completely combusted. Specifically, the self-learning process may be: the terminal acquires a current voltage signal of an oxygen sensor of the dual-fuel vehicle through the ECU; according to the historical voltage signal, determining a self-learning coefficient of a historical control signal corresponding to the control signal of the dual-fuel vehicle under the historical voltage signal from a corresponding relation of the self-learning coefficients of the voltage signal and the control signal; storing the self-learning coefficients of the historical control signals in a memory space of the ECU.
Wherein the terminal judges the air-fuel ratio through the oxygen sensor, and the historical voltage signal can be a voltage signal of the oxygen sensor measured by the terminal, and the voltage signal reflects the concentration of oxygen ions when the fuel is combusted. Generally, when the air-fuel ratio is different in value, the voltage signal is also different in value, and when the air-fuel ratio is a predetermined value, the voltage signal is also a predetermined voltage. In order to improve the judging efficiency of the terminal, the terminal can test and calibrate the voltage signals of the oxygen sensors corresponding to different air-fuel ratios in advance, judge the combustion condition of fuel according to different air-fuel ratios, determine the self-learning coefficient of the control signal, and store the voltage signal corresponding to each air-fuel ratio in a plurality of air-fuel ratios and the self-learning coefficient of the control signal corresponding to the air-fuel ratio in an associated manner.
It should be noted that, during the process of the terminal performing historical fuel control and self-learning, the terminal may perform calculation of the self-learning coefficient based on the air-fuel ratio in real time. For example, when the system performance is better in the dual-fuel vehicle and the air-fuel ratio reaches a specified air-fuel ratio, the terminal can set the self-learning coefficient to a specified value. When the air-fuel ratio does not reach the specified air-fuel ratio, that is, the fuel combustion is incomplete, the terminal may set the self-learning coefficient to a coefficient at which the control signal reaches a specified control signal, that is, a signal at which the fuel combustion is controlled to be complete. However, the self-learning coefficients may be changed continuously with the change of the environmental factors during the whole self-learning process, so that the terminal may determine the combustion condition of the fuel in a specified time, and the step of the terminal storing the self-learning coefficients of the historical control signal in the storage space of the ECU may be: the terminal determines the self-learning coefficients of the historical control signals every other preset time within the specified time through the implementation mode, and therefore a plurality of self-learning coefficients are obtained; the self-learning coefficient that appears the most frequently among the plurality of self-learning coefficients is stored in a storage space of the ECU.
The specified time may be a time from the beginning of using one fuel to the switching of the fuel or the flameout of the terminal, and the preset time period may be set and changed according to a user requirement, which is not specifically limited in the embodiment of the present invention. For example, the preset time period may be 1 minute, 3 minutes, or the like.
Step 204: and the terminal controls the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal.
In this step, the terminal determines the product of the control signal and the self-learning coefficient of the control information as the standard control signal of the engine, and the terminal controls the engine to work with the standard control signal through the ECU.
Specifically, the dual-fuel vehicle also comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein the oil nozzle and the air injection valve are connected with the ECU; the control signal may include at least one of an injection quantity, a firing angle, and a torque, as exemplified by the control signal including an injection quantity, and the current fuel being natural gas. The terminal obtains a self-learning coefficient of the injection quantity, the product of the injection quantity and the self-learning coefficient of the injection quantity is determined as a standard injection quantity of the engine, the terminal ECU sends the standard injection quantity to the engine through a Controller Area Network (CAN) bus, the engine receives the standard injection quantity through the CAN bus, and the engine controls the gas injection valve to inject the natural gas according to the standard injection quantity in the process of burning the natural gas to do work.
Furthermore, the terminal can also realize the control of the dual fuel through closed-loop control, namely, when the terminal controls the engine to work, the terminal can also detect the combustion condition of the fuel in the engine in real time through the oxygen sensor, judge the combustion condition of the fuel based on a voltage signal fed back by the oxygen sensor, and complete the self-learning process of the control signal according to the combustion condition, thereby realizing the accurate control of the fuel combustion.
Wherein, the self-learning process can be as follows: the terminal determines the current voltage signal of the engine through an oxygen sensor of the dual-fuel vehicle; according to the current voltage signal, determining a self-learning coefficient of a current control signal corresponding to the control signal of the dual-fuel vehicle under the current voltage signal from a corresponding relation of the self-learning coefficients of the voltage signal and the control signal; storing the self-learning coefficients of the current control signal into a memory space of the ECU.
It should be noted that the implementation manner of the self-learning process of the current control signal is the same as the self-learning process of the historical control signal in step 204, and details are not repeated here.
In the embodiment of the invention, the terminal determines the current fuel of the engine in the dual-fuel vehicle through the ECU; according to the current fuel, obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel; acquiring a self-learning coefficient of the control signal from a storage space of the ECU; and controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal. The terminal can identify the current fuel and acquire the control signal corresponding to the current fuel based on the fuel identification of the current fuel, so that the accuracy of controlling the dual-fuel vehicle is improved.
Fig. 7 is a block diagram of a control apparatus for a dual-fuel vehicle, which is applied to the dual-fuel vehicle including at least one ECU, according to an embodiment of the present invention, and as shown in fig. 7, the apparatus includes:
a determination module 701 for determining, by the ECU, a current fuel of an engine in the dual fuel vehicle;
a first obtaining module 702, configured to obtain, according to the current fuel, a control signal corresponding to the current fuel from a correspondence relationship between a fuel identifier and a control signal, where the control signal includes at least one of an injection amount, an ignition angle, and a torque of the current fuel;
a second obtaining module 703, configured to obtain a self-learning coefficient of the control signal from a storage space of the ECU;
and a control module 704 for controlling the engine to operate with the control signal and the self-learning coefficient of the control signal based on the control signal and the self-learning coefficient of the control signal.
In one possible design, the dual-fuel vehicle further comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein the oil nozzle and the air injection valve are both connected with the ECU;
wherein, the low side of the air injection valve is connected with the ECU, and the high side of the air injection valve is connected with the H bridge; the device also includes:
and the closing module is used for closing the gas injection valve through the H bridge when receiving a closing command for controlling the gas injection valve.
In a possible design, the first obtaining module 702 is further configured to obtain a calibration table corresponding to the current fuel according to the current fuel; the method comprises the steps of obtaining the current rotating speed and the current air inflow of the dual-fuel vehicle, searching control signals corresponding to the current fuel under the current rotating speed and the current air inflow from a calibration table, and storing a fuel identification of the fuel and the control signals corresponding to the fuel under a plurality of rotating speeds and a plurality of air inflow in the calibration table in an associated mode.
In one possible design, the apparatus further includes:
the third acquisition module is used for acquiring a current voltage signal of an oxygen sensor of the dual-fuel vehicle through the ECU;
the determining module 701 is further configured to determine, according to the current voltage signal, a self-learning coefficient of a current control signal corresponding to the control signal of the dual-fuel vehicle under the current voltage signal from a correspondence between the voltage signal and the self-learning coefficient of the control signal;
and the storage module is used for storing the self-learning coefficient of the current control signal into the storage space of the ECU.
In one possible design, the determining module 701 is further configured to obtain, by the ECU, a current flag signal of a flag bit of the dual-fuel vehicle; and according to the current mark signal, determining a fuel mark corresponding to the current mark signal from the corresponding relation between the mark signal and the fuel mark, and determining the fuel corresponding to the fuel mark as the current fuel of the engine.
In the embodiment of the invention, the terminal determines the current fuel of the engine in the dual-fuel vehicle through the ECU; according to the current fuel, obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel; acquiring a self-learning coefficient of the control signal from a storage space of the ECU; and controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal. The terminal can identify the current fuel and acquire the control signal corresponding to the current fuel based on the fuel identification of the current fuel, so that the accuracy of controlling the dual-fuel vehicle is improved.
It should be noted that: the control device for a dual-fuel vehicle provided in the above embodiment is only illustrated by the division of the above functional modules when the dual-fuel vehicle is controlled, and in practical application, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions. In addition, the control device of the dual-fuel vehicle provided by the above embodiment and the control method embodiment of the dual-fuel vehicle belong to the same concept, and the specific implementation process is detailed in the method embodiment and is not described herein again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A control method for a dual-fuel vehicle, characterized in that it is applied in a dual-fuel vehicle comprising at least one electronic controller ECU, said method comprising:
acquiring a current flag signal of a flag bit of the dual-fuel vehicle through the ECU, wherein the flag bit of the dual-fuel vehicle is used for indicating a fuel identifier of a currently used fuel;
determining a fuel identifier corresponding to the current mark signal from the corresponding relation between the mark signal and the fuel identifier according to the current mark signal, and determining the fuel corresponding to the fuel identifier as the current fuel of the engine;
acquiring a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and the control signal according to the current fuel, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel;
acquiring a self-learning coefficient of the control signal from a storage space of the ECU;
controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal;
the dual-fuel vehicle also comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein the oil nozzle and the air injection valve are connected with the ECU;
the low side of the air injection valve is connected with the ECU, and the high side of the air injection valve is connected with the H bridge; the method further comprises the following steps:
and when a closing command for controlling the gas injection valve is received, closing the gas injection valve through the H bridge.
2. The method of claim 1, wherein obtaining the control signal corresponding to the current fuel from the correspondence between the fuel identifier and the control signal according to the current fuel comprises:
acquiring a calibration table corresponding to the current fuel according to the current fuel;
and acquiring the current rotating speed and the current air inflow of the dual-fuel vehicle, searching control signals corresponding to the current fuel at the current rotating speed and the current air inflow from the calibration table, and storing a fuel identifier of the fuel and the control signals corresponding to the fuel at a plurality of rotating speeds and a plurality of air inflow in the calibration table in an associated manner.
3. The method of claim 1, wherein after controlling the engine to operate with the control signal and the self-learning coefficient of the control signal based on the control signal and the self-learning coefficient of the control signal, the method further comprises:
acquiring a current voltage signal of an oxygen sensor of the dual-fuel vehicle through the ECU;
according to the current voltage signal, determining a self-learning coefficient of a current control signal corresponding to the control signal of the dual-fuel vehicle under the current voltage signal from a corresponding relation of the self-learning coefficients of the voltage signal and the control signal;
storing the self-learning coefficients of the current control signal into a memory space of the ECU.
4. A control device for a dual-fuel vehicle, characterized in that it is applied in a dual-fuel vehicle comprising at least one electronic controller ECU, said device comprising:
a determination module for determining, by the ECU, a current fuel of an engine in the dual-fuel vehicle;
the first obtaining module is used for obtaining a control signal corresponding to the current fuel from a corresponding relation between a fuel identifier and a control signal according to the current fuel, wherein the control signal comprises at least one of the injection quantity, the ignition angle and the torque of the current fuel;
the second acquisition module is used for acquiring a self-learning coefficient of the control signal from a storage space of the ECU;
the control module is used for controlling the engine to work by the control signal and the self-learning coefficient of the control signal according to the control signal and the self-learning coefficient of the control signal;
the determining module is further used for acquiring a current mark signal of a mark bit of the dual-fuel vehicle through the ECU; determining a fuel identifier corresponding to the current mark signal from the corresponding relation between the mark signal and the fuel identifier according to the current mark signal, and determining the fuel corresponding to the fuel identifier as the current fuel of the engine;
the dual-fuel vehicle also comprises an oil nozzle for controlling gasoline and an air injection valve for controlling natural gas, wherein the oil nozzle and the air injection valve are connected with the ECU;
the low side of the air injection valve is connected with the ECU, and the high side of the air injection valve is connected with the H bridge; the device further comprises:
and the closing module is used for closing the air injection valve through the H bridge when receiving a closing instruction for controlling the air injection valve.
5. The apparatus of claim 4,
the first obtaining module is further configured to obtain a calibration table corresponding to the current fuel according to the current fuel; and acquiring the current rotating speed and the current air inflow of the dual-fuel vehicle, searching control signals corresponding to the current fuel at the current rotating speed and the current air inflow from the calibration table, and storing a fuel identifier of the fuel and the control signals corresponding to the fuel at a plurality of rotating speeds and a plurality of air inflow in the calibration table in an associated manner.
6. The apparatus of claim 4, further comprising:
the third acquisition module is used for acquiring a current voltage signal of an oxygen sensor of the dual-fuel vehicle through the ECU;
the determining module is further used for determining the self-learning coefficient of the current control signal corresponding to the control signal of the dual-fuel vehicle under the current voltage signal from the corresponding relation of the self-learning coefficients of the voltage signal and the control signal according to the current voltage signal;
and the storage module is used for storing the self-learning coefficient of the current control signal into the storage space of the ECU.
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