CN109519293B - Method for controlling fuel injection quantity of fuel system and fuel system - Google Patents
Method for controlling fuel injection quantity of fuel system and fuel system Download PDFInfo
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- CN109519293B CN109519293B CN201811270988.8A CN201811270988A CN109519293B CN 109519293 B CN109519293 B CN 109519293B CN 201811270988 A CN201811270988 A CN 201811270988A CN 109519293 B CN109519293 B CN 109519293B
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- fuel
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- injection quantity
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
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- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a method for controlling the injection quantity of a fuel system, wherein the fuel system comprises a fuel distribution pipe and a fuel injector, and the method comprises the following steps: s1: detecting the temperature of the fuel in the fuel distribution pipe in real time; s2: calculating the fuel injection quantity Vn required by the fuel system according to the temperature; s3: and controlling the oil injection time of the oil injector to obtain the oil injection quantity Vn. The invention also provides a fuel system for an automotive engine, comprising: and the electronic control unit ECU calculates and controls the oil injection time of the oil injector according to the information transmitted by the fuel oil temperature sensor to obtain the oil injection quantity Vn. The fuel temperature sensor is used for acquiring the temperature of the fuel to enter the combustion chamber to obtain the required fuel injection quantity, so that the error caused by the change of the fuel temperature is avoided, and the precision of the fuel quantity entering the combustion chamber is ensured.
Description
Technical Field
The invention relates to the technical field of automobile power systems, in particular to a method for controlling the fuel injection quantity of a fuel system and the fuel system.
Background
The fuel injection quantity of the fuel injector is a linear function of the opening time of the fuel injector, the pressure of a fuel system of a traditional gasoline engine is usually a fixed value, the fuel system defaults that the volume of the fuel cannot change along with the temperature change of the fuel, and the volume can increase along with the temperature rise according to Van der Waals equation. Thus, conventional fuel systems result in inaccurate engine fuel demands under different fuel temperature conditions.
Disclosure of Invention
The invention mainly aims to provide a method for controlling the fuel injection quantity of a fuel system with good fuel injection quantity precision and the fuel system.
In order to achieve the above object, the present invention provides a method for controlling fuel injection amount of a fuel system, the fuel system comprising a fuel distribution pipe and a fuel injector, the method comprising:
s1: detecting the temperature of the fuel in the fuel distribution pipe in real time;
s2: calculating the fuel injection quantity Vn required by the fuel system according to the temperature;
s3: and controlling the oil injection time of the oil injector to obtain the oil injection quantity Vn.
In one embodiment, in step S1, the fuel temperature detection includes: when the resistance value of the fuel temperature sensor changes due to the fuel temperature, the current of the fuel temperature sensor changes, the voltage of the fuel temperature sensor is calculated according to the current value, and the fuel temperature in the fuel distribution pipe in the current state is calculated according to different voltage information.
In one embodiment, before step S2, the method further includes detecting the air pressure of air entering the combustion chamber, the opening angle of the throttle valve, the oxygen content in exhaust after fuel combustion, the water temperature of cooling water, the vehicle speed of the vehicle and the engine speed in real time, and calculating the fuel injection amount V1.
In one embodiment, in step S2, the required fuel injection amount Vn is obtained according to the fuel temperature and the fuel injection amount V1.
The invention also provides a fuel system for an automotive engine, comprising:
the combustion system comprises a combustion chamber and an oil injector arranged on the lower surface of a top cover of the combustion chamber;
the fuel supply system comprises a fuel distribution pipe, and the fuel distribution pipe is arranged on the upper surface of the combustion chamber top cover and is communicated with the fuel injector;
the sensing system comprises a fuel temperature sensor for sensing the temperature of the fuel in the fuel distribution pipe, and the fuel temperature sensor is arranged on the fuel distribution pipe;
and the electronic control unit ECU is electrically connected with the fuel temperature sensor and the fuel injector respectively, and calculates and controls the fuel injection time of the fuel injector according to the information transmitted by the fuel temperature sensor so as to control the fuel injection quantity Vn.
In one embodiment, the ECU includes a calculation module and a control module, the calculation module calculates information transmitted by the fuel temperature sensor to obtain a required fuel injection quantity Vn, and the control module controls the fuel injection quantity Vn by controlling the fuel injection time of the fuel injector according to the fuel injection quantity Vn.
In one embodiment, the fuel temperature detection of the fuel temperature sensor includes: when the resistance value of the fuel temperature sensor changes due to the fuel temperature, the current in the fuel temperature sensor changes, and the calculation module calculates the voltage of the fuel temperature sensor according to the current value and calculates the temperature of the fuel in the fuel distribution pipe in the current state according to different voltage information.
In one embodiment, the fuel supply system further includes a fuel tank and a pressure valve, one end of the pressure valve is communicated with the fuel tank, the other end of the pressure valve is communicated with the fuel distribution pipe, and the pressure valve is electrically connected with the ECU.
In one embodiment, the sensing system further includes an intake pressure sensor for detecting air pressure of air entering the combustion chamber, a water temperature sensor for detecting water temperature of cooling water, a throttle position sensor for detecting an opening angle of a throttle, an oxygen sensor for detecting oxygen content in exhaust gas after fuel combustion, a rotation speed sensor for detecting a rotation speed of an engine, and a vehicle speed sensor for detecting a vehicle speed of a motor vehicle, the ECU is electrically connected to the intake pressure sensor, the water temperature sensor, the throttle position sensor, the oxygen sensor, the rotation speed sensor, and the vehicle speed sensor, respectively, the calculation module calculates an oil injection amount V1 according to information collected by the intake pressure sensor, the water temperature sensor, the throttle position sensor, the oxygen sensor, the rotation speed sensor, and the vehicle speed sensor, and obtaining the required oil injection quantity Vn according to the temperature and the oil injection quantity V1.
The method for controlling the fuel injection quantity of the fuel system acquires the temperature of the fuel entering the combustion chamber through the fuel temperature sensor to obtain the required fuel injection quantity, avoids errors caused by the change of the fuel temperature, and accordingly ensures the precision of the fuel entering the combustion chamber.
Drawings
FIG. 1 is a flowchart illustrating steps of a method for controlling fuel injection amount of a fuel system according to an embodiment of the invention.
FIG. 2 is a block diagram of a fuel system according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of the injection of a fuel system according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Referring to fig. 1, a method for controlling an injection amount of a fuel system including a fuel distribution pipe and a fuel injector according to an embodiment of the present invention includes the following steps.
S1: the temperature of the fuel in the fuel distribution pipe is detected in real time.
Specifically, the fuel temperature detection includes: when the resistance value of the fuel temperature sensor changes due to the fuel temperature, the current of the fuel temperature sensor changes, the voltage of the fuel temperature sensor is calculated according to the current value, and the fuel temperature in the fuel distribution pipe in the current state is calculated according to different voltage information.
S2: and calculating the fuel injection quantity Vn required by the fuel system according to the temperature.
Specifically, before step S2, the method further includes detecting the air pressure of air entering the combustion chamber, the opening angle of the throttle valve, the oxygen content in exhaust gas after fuel combustion, the water temperature of cooling water, the vehicle speed of the vehicle and the engine speed in real time, and calculating the fuel injection quantity V1.
In step S2, the fuel injection quantity V1 is calculated from the air pressure, the opening angle, the oxygen content, the water temperature, the vehicle speed, and the rotational speed, and the required fuel injection quantity Vn is obtained from the fuel temperature and the fuel injection quantity V1.
S3: and controlling the oil injection time of the oil injector to obtain the required oil injection quantity Vn.
Specifically, in the present embodiment, the fuel injection amount of the injector is proportional to the time, so that the specific fuel injection amount of the injector can be controlled by controlling the fuel injection time.
Referring to fig. 2 and 3, the embodiment of the invention also discloses a fuel system, comprising,
the combustion system comprises a combustion chamber 31 and an injector 33 arranged on the lower surface of a top cover of the combustion chamber 31.
The fuel supply system includes a fuel distribution pipe 133, and the fuel distribution pipe 133 is provided on an upper surface of the top cover of the combustion chamber 31 and communicates with the fuel injector 33.
The sensing system includes a fuel temperature sensor 21 for sensing the temperature of the fuel within the fuel distribution pipe 133, the fuel temperature sensor 21 being disposed on the fuel distribution pipe 133.
The electronic control unit ECU50 is electrically connected to the fuel temperature sensor 21 and the injector 33, respectively. The ECU50 includes a control module 53 and a calculation module 51, the calculation module 51 calculates the fuel injection quantity Vn according to the information transmitted by the fuel temperature sensor 21, and the control module 53 controls the fuel injection time of the fuel injector to obtain the required fuel injection quantity Vn.
In the present embodiment, the fuel supply system is further provided with a fuel tank 11, a pressure valve 14, an inlet pipe 131, and a gasoline pump 13. One end of the oil inlet pipe 131 is connected with the oil tank 11, and the other end is connected with the fuel distribution pipe 133; the pressure valve 14 has one end communicating with the oil inlet pipe 131 and the other end communicating with the oil tank 11. A gasoline pump 12 is provided in the fuel tank 11, and the gasoline pump 12 delivers fuel through an inlet pipe 131 to a fuel distribution pipe 133. The electronic control unit ECU50 is electrically connected to the pressure valves 14, respectively. Specifically, the calculation module 51 calculates the pressure in the fuel distribution pipe based on the fuel temperature, and the control module 53 controls the pressure valve 14 to release the pressure. The pressure in the fuel distribution pipe 133 is ensured to be consistent with the pressure in the fuel tank 11, so that the volume of the fuel in the fuel distribution pipe 133 is ensured to be unchanged, and the accuracy of the fuel entering the combustion chamber 31 in unit time is ensured.
In order to ensure that the accuracy of the fuel injection quantity Vn required by entering the combustion chamber 31 is higher, the sensing system further comprises an intake pressure sensor 27 for detecting the quantity of air entering the combustion chamber, a water temperature sensor 26 for detecting the temperature of cooling water, a throttle position sensor 25 for detecting the opening angle of a throttle valve, an oxygen sensor 24 for detecting the oxygen content in exhaust gas after fuel combustion, a rotating speed sensor 23 for detecting the rotating speed of an engine and a vehicle speed sensor 22 for detecting the speed of a motor vehicle. An intake pressure sensor 27, a throttle position sensor 25 and an oxygen sensor 24 are mounted on the throttle assembly, and a water temperature sensor 26, a rotational speed sensor 23 and a vehicle speed sensor 22 are mounted on the automobile engine. The electronic control unit ECU is electrically connected to an intake pressure sensor 27, a water temperature sensor 26, a throttle position sensor 25, an oxygen sensor 24, a rotational speed sensor 23, and a vehicle speed sensor 22, respectively. The calculation module 51 calculates the fuel injection quantity V1 according to the information collected by the intake pressure sensor 27, the water temperature sensor 26, the throttle position sensor 25, the oxygen sensor 24, the rotation speed sensor 23 and the vehicle speed sensor 22, and obtains the required fuel injection quantity Vn according to the fuel injection quantity V1 and the fuel temperature; the control module 53 controls when the injector 33 injects fuel to obtain the injected fuel quantity Vn.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method of controlling fuel injection in a fuel system, the fuel system including a fuel distribution rail and a fuel injector, the method comprising:
s1: detecting the temperature of fuel in the fuel distribution pipe in real time, detecting the air pressure of air entering a combustion chamber, the opening angle of a throttle valve, the oxygen content in exhaust after the fuel is combusted, the water temperature of cooling water, the speed of a motor vehicle and the rotating speed of an engine in real time, and calculating the fuel injection quantity V1;
s2: calculating the fuel injection quantity Vn required by the fuel system according to the temperature and the fuel injection quantity V1;
s3: and controlling the oil injection time of the oil injector to obtain the oil injection quantity Vn.
2. The method of controlling fuel injection quantity in a fuel system of claim 1, wherein the fuel temperature detection in step S1 includes: when the resistance value of the fuel temperature sensor changes due to the fuel temperature, the current of the fuel temperature sensor changes, the voltage of the fuel temperature sensor is calculated according to the current value, and the fuel temperature in the fuel distribution pipe in the current state is calculated according to different voltage information.
3. A fuel system for an automotive engine, comprising:
the combustion system comprises a combustion chamber and an oil injector arranged on the lower surface of a top cover of the combustion chamber;
the fuel supply system comprises a fuel distribution pipe, and the fuel distribution pipe is arranged on the upper surface of the combustion chamber top cover and is communicated with the fuel injector;
sensing system, including being used for listening the fuel temperature sensor of fuel temperature in the fuel distributing pipe, fuel temperature sensor set up in on the fuel distributing pipe to and be used for listening the intake pressure sensor who gets into the interior air pressure of combustion chamber, be used for listening the temperature sensor of cooling water temperature, be used for listening the throttle valve position sensor of throttle valve opening angle, be used for listening the oxygen sensor of oxygen content in the exhaust after the fuel burning, be used for listening the tachometric sensor of engine speed, be used for listening the speed sensor of motor vehicle, electronic control unit ECU electric connection respectively intake pressure sensor, temperature sensor, throttle valve position sensor, oxygen sensor, tachometric sensor, speed sensor, calculation module basis intake pressure sensor, temperature sensor, throttle valve position sensor, The oxygen sensor, the rotating speed sensor and the vehicle speed sensor acquire information to calculate the oil injection quantity V1, and the required oil injection quantity Vn is obtained according to the temperature and the oil injection quantity V1;
and the electronic control unit ECU is electrically connected with the fuel temperature sensor and the fuel injector respectively, and calculates and controls the fuel injection time of the fuel injector according to the information transmitted by the fuel temperature sensor so as to control the fuel injection quantity Vn.
4. The fuel system as recited in claim 3, wherein said ECU includes a calculation module and a control module, said calculation module calculates information transmitted from said fuel temperature sensor to obtain a desired injection quantity Vn, said control module controls injection timing of said injector based on said injection quantity Vn to control said injection quantity Vn.
5. The fuel system as recited in claim 4, wherein the fuel temperature sensing of the fuel temperature sensor comprises: when the resistance value of the fuel temperature sensor changes due to the fuel temperature, the current in the fuel temperature sensor changes, and the calculation module calculates the voltage of the fuel temperature sensor according to the current value and calculates the temperature of the fuel in the fuel distribution pipe in the current state according to different voltage information.
6. The fuel system as recited in claim 3, wherein said fuel supply system further comprises a fuel tank and a pressure valve, said pressure valve having one end communicating with said fuel tank and the other end communicating with said fuel distribution pipe, and said pressure valve being electrically connected to said ECU.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811270988.8A CN109519293B (en) | 2018-10-29 | 2018-10-29 | Method for controlling fuel injection quantity of fuel system and fuel system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811270988.8A CN109519293B (en) | 2018-10-29 | 2018-10-29 | Method for controlling fuel injection quantity of fuel system and fuel system |
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| CN109519293A CN109519293A (en) | 2019-03-26 |
| CN109519293B true CN109519293B (en) | 2021-12-28 |
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| CN111396205B (en) * | 2020-03-21 | 2021-06-01 | 东风汽车集团有限公司 | Control method for combustion judgment of hybrid vehicle in parallel state |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2996600B1 (en) * | 2012-10-05 | 2014-11-21 | Continental Automotive France | METHOD FOR MANAGING THE FUEL MASS INJECTED IN AN ENGINE |
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| CN101151452A (en) * | 2005-04-06 | 2008-03-26 | 株式会社电装 | Fuel injection controller |
| CN201882015U (en) * | 2010-12-16 | 2011-06-29 | 吉林大学 | Hydraulic common rail device of engineering vehicle multi work hydraulic sources |
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| JP2017078387A (en) * | 2015-10-22 | 2017-04-27 | ヤンマー株式会社 | engine |
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| CN109519293A (en) | 2019-03-26 |
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