阅读说明：本技术 发动机的进气流量值获取方法、装置及电子控制单元 (Method and device for acquiring intake flow value of engine and electronic control unit ) 是由 高建立 王新校 周海磊 于 2019-09-29 设计创作，主要内容包括：本发明提供一种发动机的进气流量值获取方法、装置及电子控制单元,该方法包括：在检测到电子控制单元上电并启动发动机后,接收传感器发送的增压器信息和压气机信息,其中压气机信息包括压气机的进口压力值和压气机的进口温度值,根据增压器信息和压气机信息确定所述压气机的压缩比值和增压器的折合转速值；获取压气机性能图谱,并从所述压气机性能图谱中查找所述压缩比值和所述折合转速值所对应的压气机的折合流量值；根据所述折合流量值、所述进口温度值和所述进口压力值得到所述发动机的进气流量值,未采用流量计进行测量发动机的进气流量,避免出现节流计带来的节流效应,降低对发动机运行工况的影响。(The invention provides a method and a device for acquiring an intake flow value of an engine and an electronic control unit, wherein the method comprises the following steps: after detecting that the electronic control unit is powered on and an engine is started, receiving supercharger information and compressor information sent by a sensor, wherein the compressor information comprises an inlet pressure value of a compressor and an inlet temperature value of the compressor, and determining a compression ratio of the compressor and a reduced rotating speed value of the supercharger according to the supercharger information and the compressor information; obtaining a performance map of the gas compressor, and searching a reduced flow value of the gas compressor corresponding to the compression ratio and the reduced rotating speed value from the performance map of the gas compressor; and obtaining an intake air flow value of the engine according to the converted flow value, the inlet temperature value and the inlet pressure value, wherein a flow meter is not adopted to measure the intake air flow of the engine, so that the throttling effect caused by the throttling flow meter is avoided, and the influence on the running condition of the engine is reduced.)

1. An intake air flow rate value acquisition method of an engine, characterized by comprising:

after detecting that the electronic control unit is powered on and an engine is started, receiving supercharger information and compressor information sent by a sensor, wherein the compressor information comprises an inlet pressure value of a compressor and an inlet temperature value of the compressor;

determining the compression ratio of the gas compressor and the reduced rotating speed value of the supercharger according to the supercharger information and the gas compressor information;

obtaining a performance map of the gas compressor, and searching a reduced flow value of the gas compressor corresponding to the compression ratio and the reduced rotating speed value from the performance map of the gas compressor;

and obtaining an intake air flow value of the engine according to the reduced flow value, the inlet temperature value and the inlet pressure value.

2. The method of claim 1, wherein the compressor information further includes an outlet pressure value of the compressor; the supercharger information includes a rotational speed value of the supercharger;

the determining the compression ratio of the gas compressor and the reduced rotating speed value of the supercharger according to the supercharger information and the gas compressor information comprises the following steps:

obtaining the compression ratio according to the outlet pressure value and the inlet pressure value;

and obtaining the reduced rotating speed value according to the rotating speed value and the inlet temperature value.

3. The method of claim 2, wherein said deriving said compression ratio from said outlet pressure value and said inlet pressure value comprises:

by passing

Determining the compression ratio, wherein P' is the compression ratio, P2 is the outlet pressure value, and P1 is the inlet pressure value.

4. The method of claim 2, wherein said deriving the reduced speed value from the speed value and the inlet temperature value comprises:

by passing

Determining the reduced rotation speed value, wherein n' is the reduced rotation speed value, n is the rotation speed value, and T1 is the inlet temperature value.

5. The method of claim 1, wherein said deriving an intake air flow value for said engine from said reduced flow value, said inlet temperature value, and said inlet pressure value comprises:

by passing

And obtaining the intake air flow value, wherein m is the intake air flow value, m' is the reduced flow value, T1 is the inlet temperature value, and P1 is the inlet pressure value.

6. The method of claim 1, wherein the obtaining a compressor performance map comprises:

obtaining the model of the compressor;

and searching a compressor performance map corresponding to the compressor model.

7. An intake air flow rate value acquisition apparatus of an engine, characterized by comprising:

the information acquisition module is used for receiving supercharger information and compressor information sent by a sensor after detecting that the electronic control unit is electrified and an engine is started, wherein the compressor information comprises an inlet pressure value of a compressor and an inlet temperature value of the compressor;

the information processing module is used for determining the compression ratio of the air compressor and the reduced rotating speed value of the supercharger according to the supercharger information and the air compressor information;

the folded flow determining module is used for acquiring a performance map of the gas compressor and searching the folded flow value of the gas compressor corresponding to the compression ratio and the folded rotating speed value from the performance map of the gas compressor;

and the intake flow acquisition module is used for acquiring the intake flow value of the engine according to the converted flow value, the inlet temperature value and the inlet pressure value.

8. The apparatus of claim 7, wherein the compressor information further comprises an outlet pressure value of the compressor; the supercharger information includes a rotational speed value of the supercharger;

the information processing module is specifically configured to:

obtaining the compression ratio according to the outlet pressure value and the inlet pressure value;

and obtaining the reduced rotating speed value according to the rotating speed value and the inlet temperature value.

9. An electronic control unit, comprising: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of obtaining an intake air flow value of an engine according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that a computer-executable instruction is stored therein, which when executed by a processor, implements an intake air flow rate value acquisition method of an engine according to any one of claims 1 to 6.

Technical Field

The embodiment of the invention relates to the technical field of vehicles, in particular to a method and a device for acquiring an intake flow value of an engine and an electronic control unit.

Background

When an Exhaust Gas Recirculation (EGR) system and other control systems on a motor vehicle control related devices on the related vehicle, related strategies need to be formulated according to the intake air flow of the engine, and therefore, the intake air flow of the engine needs to be acquired.

Disclosure of Invention

The embodiment of the invention provides a method and a device for acquiring an intake flow value of an engine and an electronic control unit, which are used for reducing the influence on the operation condition of the engine.

In a first aspect, an embodiment of the present invention provides a method for obtaining an intake air flow value of an engine, including:

after detecting that the electronic control unit is powered on and an engine is started, receiving supercharger information and compressor information sent by a sensor, wherein the compressor information comprises an inlet pressure value of a compressor and an inlet temperature value of the compressor;

determining the compression ratio of the gas compressor and the reduced rotating speed value of the supercharger according to the supercharger information and the gas compressor information;

obtaining a performance map of the gas compressor, and searching a reduced flow value of the gas compressor corresponding to the compression ratio and the reduced rotating speed value from the performance map of the gas compressor;

and obtaining an intake air flow value of the engine according to the reduced flow value, the inlet temperature value and the inlet pressure value.

In one possible design, the compressor information further includes an outlet pressure value of the compressor; the supercharger information includes a rotational speed value of the supercharger;

the determining the compression ratio of the gas compressor and the reduced rotating speed value of the supercharger according to the supercharger information and the gas compressor information comprises the following steps:

obtaining the compression ratio according to the outlet pressure value and the inlet pressure value;

and obtaining the reduced rotating speed value according to the rotating speed value and the inlet temperature value.

In one possible design, the deriving the compression ratio from the outlet pressure value and the inlet pressure value includes:

by passing

Determining the compression ratio, wherein P' is the compression ratio, P2 is the outlet pressure value, and P1 is the inlet pressure value.

In one possible design, the obtaining the reduced rotation speed value according to the rotation speed value and the inlet temperature value includes:

by passing

Determining the reduced rotation speed value, wherein n' is the reduced rotation speed value, n is the rotation speed value, and T1 is the inlet temperature value.

In one possible design, the obtaining an intake air flow value of the engine according to the reduced flow value, the inlet temperature value and the inlet pressure value includes:

by passing

And obtaining the intake air flow value, wherein m is the intake air flow value, m' is the reduced flow value, T1 is the inlet temperature value, and P1 is the inlet pressure value.

In one possible design, the obtaining a compressor performance map includes:

obtaining the model of the compressor;

and searching a compressor performance map corresponding to the compressor model.

In a second aspect, an embodiment of the present invention provides an intake air flow rate value acquisition apparatus for an engine, including:

the information acquisition module is used for receiving supercharger information and compressor information sent by a sensor after detecting that the electronic control unit is electrified and an engine is started, wherein the compressor information comprises an inlet pressure value of a compressor and an inlet temperature value of the compressor;

the information processing module is used for determining the compression ratio of the air compressor and the reduced rotating speed value of the supercharger according to the supercharger information and the air compressor information;

the folded flow determining module is used for acquiring a performance map of the gas compressor and searching the folded flow value of the gas compressor corresponding to the compression ratio and the folded rotating speed value from the performance map of the gas compressor;

and the intake flow acquisition module is used for acquiring the intake flow value of the engine according to the converted flow value, the inlet temperature value and the inlet pressure value.

In one possible design, the compressor information further includes an outlet pressure value of the compressor; the supercharger information includes a rotational speed value of the supercharger;

the information processing module is specifically configured to:

obtaining the compression ratio according to the outlet pressure value and the inlet pressure value;

and obtaining the reduced rotating speed value according to the rotating speed value and the inlet temperature value.

In one possible design, the information processing module is further specifically configured to:

by passing

Determining the compression ratio, wherein P' is the compression ratio, P2 is the outlet pressure value, and P1 is the inlet pressure value.

In one possible design, the information processing module is further specifically configured to:

by passing

Determining the reduced rotation speed value, wherein n' is the reduced rotation speed value, n is the rotation speed value, and T1 is the inlet temperature value.

In one possible design, the intake flow acquisition module is specifically configured to:

by passing

And obtaining the intake air flow value, wherein m is the intake air flow value, m' is the reduced flow value, T1 is the inlet temperature value, and P1 is the inlet pressure value.

In one possible design, the information obtaining module is further configured to: obtaining the model of the compressor; and searching a compressor performance map corresponding to the compressor model.

In a third aspect, an embodiment of the present invention provides an electronic control unit, including: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executes computer-executable instructions stored in the memory to cause the at least one processor to perform the intake air flow value acquisition method of the engine according to any one of the first aspect.

In a fourth aspect, the embodiment of the present invention provides a computer-readable storage medium, in which a computer executing instructions are stored, and when a processor executes the computer executing instructions, the method for obtaining an intake air flow value of an engine according to any one of the first aspect is implemented.

The embodiment of the invention provides a method and a device for acquiring an intake flow value of an engine and an electronic control unit, after the method receives the supercharger information and the compressor information sent by the sensor, the method determines the compressor compression ratio and the reduced rotating speed value of the supercharger required by obtaining the reduced flow value of the compressor according to the supercharger information and the compressor information, then the reduced flow value corresponding to the compression ratio and the reduced rotating speed value is directly searched in the performance map of the gas compressor, directly determining the air inlet flow of the engine according to the reduced flow value, the inlet pressure value and the inlet temperature value in the compressor information without adopting a flowmeter to measure the air inlet flow of the engine, therefore, a flowmeter does not need to be installed on the engine pipeline, the throttle effect of the throttle is prevented, the pressure drop generated on the engine pipeline is avoided, and the influence on the running condition of the engine is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of an intake air flow value acquisition scenario of an engine according to an embodiment of the present invention;

FIG. 2 is a first flowchart of a method for obtaining an intake air flow value of an engine according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a compressor performance map provided by an embodiment of the invention;

FIG. 4 is a second flowchart of a method for obtaining an intake air flow value of an engine according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an intake air flow value acquisition device of an engine according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a hardware structure of the electronic control unit according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.