CN108104964B - Intake air temperature correction method and device and engine controller - Google Patents

Abstract

The invention provides an intake air temperature correction method, device and engine controller. The method is applied to an engine controller and includes determining the current operating condition of the engine; determining the current absorbed heat of an intake air temperature sensor under the current operating condition; The absorbed heat corrects the intake air temperature measured by the intake air temperature sensor. Based on the method disclosed in the present invention, the measurement error of the intake air temperature sensor can be reduced or even eliminated on the premise of not increasing the manufacturing cost and the weight of the whole vehicle, providing a more reliable input for the subsequent calculation of the intake air amount, thereby optimizing the economy of the engine and dynamic.

Description

A kind of intake air temperature correction method, device and engine controller

technical field

The present invention relates to the technical field of automobiles, and more particularly, to an intake air temperature correction method, device and engine controller.

Background technique

In EGR (Exhaust Gas Recirculation, exhaust gas recirculation system), it is necessary to supply oil to the cylinder in combination with the intake air volume of the engine. Therefore, it is very important to accurately measure the intake air volume of the engine.

At this stage, sensors are mainly used to measure the intake air temperature and intake pressure, and the intake air volume is calculated in combination with the volume of the space where the gas is located. The intake air temperature sensor that measures the intake air temperature is installed in the intake manifold, and the core component is the thermistor, so it is greatly affected by the thermal radiation of the engine cylinder liner, supercharger and other devices, which is easy to cause the intake air temperature measurement. deviation.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an intake air temperature correction method and device to solve the problem of intake air temperature measurement deviation caused by the influence of thermal radiation on the intake air temperature sensor. The technical solution is as follows:

An intake air temperature correction method, applied to an engine controller, includes:

Determine the current operating conditions of the engine;

determining the current absorbed heat of the intake air temperature sensor under the current operating condition, where the current absorbed heat is used to represent the heat absorbed by the intake air temperature sensor currently affected by thermal radiation;

The intake air temperature measured by the intake air temperature sensor is corrected according to the current absorbed heat.

Preferably, the determining the current operating condition of the engine includes:

Collect the current engine speed and current fuel injection quantity;

The current operating condition is determined according to the current rotational speed and the current fuel injection amount.

Preferably, the determining the current absorbed heat of the intake air temperature sensor under the current operating condition includes:

Retrieve the corresponding relationship between the preset working conditions and the absorbed heat;

The current absorbed heat corresponding to the current operating condition is determined according to the corresponding relationship.

Preferably, the correction of the intake air temperature measured by the intake air temperature sensor according to the current absorbed heat includes:

Calculate the temperature rise of the intake air temperature sensor according to the current absorbed heat;

The difference between the intake air temperature measured by the intake air temperature sensor and the temperature rise is taken as the actual intake air temperature.

An intake air temperature correction device, comprising: a first determination module, a second determination module and a correction module;

The first determination module is used to determine the current operating condition of the engine;

The second determination module is configured to determine the current absorbed heat of the intake air temperature sensor under the current operating condition, where the current absorbed heat is used to represent the heat absorbed by the intake air temperature sensor currently affected by thermal radiation;

The correction module is configured to correct the intake air temperature measured by the intake air temperature sensor according to the current absorbed heat.

Preferably, the first determining module is specifically used for:

The current rotational speed and the current fuel injection quantity of the engine are collected; the current work condition is determined according to the current rotational speed and the current fuel injection quantity.

Preferably, the second determining module is specifically used for:

The corresponding relationship between the preset working conditions and the absorbed heat is retrieved; the current absorbed heat corresponding to the current working condition is determined according to the corresponding relationship.

Preferably, the correction module is specifically used for:

Calculate the temperature rise of the intake air temperature sensor according to the current absorbed heat; use the difference between the intake air temperature measured by the intake air temperature sensor and the temperature rise as the actual intake air temperature.

An engine controller, comprising: a memory and a processor;

the memory for storing programs;

The processor is configured to run a program stored in the memory, wherein the program is used to:

Determine the current operating conditions of the engine;

determining the current absorbed heat of the intake air temperature sensor under the current working condition, where the current absorbed heat is used to represent the heat absorbed by the intake air temperature sensor under the influence of thermal radiation under the current working condition;

The intake air temperature measured by the intake air temperature sensor is corrected according to the current absorbed heat.

Compared with the prior art, the beneficial effects realized by the present invention are:

The above-mentioned method, device and engine controller for the correction of intake air temperature provided by the present invention can reduce or even eliminate the measurement error of the intake air temperature sensor without increasing the manufacturing cost and the weight of the whole vehicle, so that the subsequent intake air volume can be reduced or even eliminated. Calculations provide more reliable input to optimize engine economy and power.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a method flow chart of a method for correcting an intake air temperature provided by an embodiment of the present invention;

Fig. 2 is a partial method flow chart of a method for correcting an intake air temperature provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an intake air temperature correction device provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a method for correcting intake air temperature. The method is applied to an engine controller. The flowchart of the method is shown in FIG. 1 and includes the following steps:

S10, determine the current working condition of the engine;

In this embodiment, since the engine will generate different heat under different working conditions, the impact on the intake air temperature sensor will be different. Therefore, the intake air temperature measured by the intake air temperature sensor can be corrected by heat radiation based on the working conditions. .

Specifically, the working modes of the engine include normal, heating and regeneration, and the working conditions in each working mode are also different. Each working condition has a certain speed range and fuel injection quantity range, so the current working condition can be determined based on the current engine speed and the current fuel injection quantity.

S20, determining the current absorbed heat of the intake air temperature sensor under the current operating condition, where the current absorbed heat is used to represent the heat absorbed by the intake air temperature sensor currently affected by thermal radiation;

In this embodiment, the analog method can be used to measure the heat absorbed by the intake air temperature sensor under the influence of thermal radiation under different working conditions. In this process, the engine cylinder liner and the supercharger under different working conditions are equivalent to heat sources with different temperatures, and the heat absorbed in the steady state at the same distance from the intake air temperature sensor is measured by a calorimeter. Using this method, the heat absorbed by the intake air temperature sensor under different engine operating conditions can be calibrated.

In the specific implementation process, the process of step S20 "determining the current absorbed heat of the intake air temperature sensor under the current operating condition" may specifically adopt the following steps, and the method flowchart is shown in Figure 2:

S201, retrieve the corresponding relationship between the preset operating conditions and the absorbed heat;

In this embodiment, the corresponding relationship can be recorded in the MAP table, and can also be recorded in the working condition-heat absorption curve, which is not specifically limited, and can be selected according to actual needs.

S202: Determine the current absorbed heat corresponding to the current operating condition according to the corresponding relationship.

S30, correcting the intake air temperature measured by the intake air temperature sensor according to the current absorbed heat;

In this embodiment, the law of thermodynamics can be followed: temperature rise=absorption heat/(specific heat capacity*mass), that is, ΔT=Q/(C*M), wherein the specific heat capacity and mass of the intake air temperature sensor are known constants. Further, the difference between the intake air temperature measured by the intake air temperature sensor and the temperature rise is taken as the actual intake air temperature.

The above steps S201 to S202 are only a preferred implementation of the process of “determining the current absorbed heat of the intake air temperature sensor under the current operating condition” in step S20 in the embodiment of the present application, and the specific implementation of this process can be based on your own It needs to be set arbitrarily and is not limited here.

The intake air temperature correction method provided by the invention can reduce or even eliminate the measurement error of the intake air temperature sensor on the premise of not increasing the manufacturing cost and the weight of the whole vehicle, and provide a more reliable input for the subsequent calculation of the intake air amount, thereby optimizing the engine economy and power.

Based on the intake air temperature correction method provided by the above-mentioned embodiment, the embodiment of the present invention correspondingly provides a device for executing the above-mentioned intake air temperature correction method. The schematic structural diagram of the device is shown in FIG. a determination module 20 and a correction module 30;

a first determination module 10, configured to determine the current operating condition of the engine;

The second determination module 20 is configured to determine the current absorbed heat of the intake air temperature sensor under the current operating condition, where the current absorbed heat is used to represent the heat absorbed by the intake air temperature sensor currently affected by thermal radiation;

The correction module 30 is configured to correct the intake air temperature measured by the intake air temperature sensor according to the current absorbed heat.

In some other embodiments, the first determining module 10 is specifically configured to:

Collect the current speed and current fuel injection quantity of the engine; determine the current working condition according to the current speed and current fuel injection quantity.

In some other embodiments, the second determining module 20 is specifically configured to:

The corresponding relationship between the preset working conditions and the absorbed heat is retrieved; the current absorbed heat corresponding to the current working condition is determined according to the corresponding relationship.

In some other embodiments, the correction module 30 is specifically used for:

Calculate the temperature rise of the intake air temperature sensor according to the current absorbed heat; take the difference between the intake air temperature measured by the intake air temperature sensor and the temperature rise as the actual intake air temperature.

The intake air temperature correction device provided by the invention can reduce or even eliminate the measurement error of the intake air temperature sensor on the premise of not increasing the manufacturing cost and the weight of the whole vehicle, and provide a more reliable input for the subsequent calculation of the intake air amount, thereby optimizing the engine economy and power.

Based on the intake air temperature correction method and the intake air temperature correction device provided by the above embodiments, an embodiment of the present invention provides an engine controller, which includes a memory and a processor;

memory for storing programs;

a processor for running a program stored in the memory, wherein the program is used to:

Determine the current operating conditions of the engine;

determining the current absorbed heat of the intake air temperature sensor under the current operating condition, where the current absorbed heat is used to represent the heat absorbed by the intake air temperature sensor currently affected by thermal radiation;

The intake air temperature measured by the intake air temperature sensor is corrected according to the current absorbed heat.

The engine controller provided by the invention can reduce or even eliminate the measurement error of the intake air temperature sensor on the premise of not increasing the manufacturing cost and the weight of the whole vehicle, and provides a more reliable input for the calculation of the subsequent intake air amount, thereby optimizing the economy of the engine sex and motivation.

The method, device and engine controller for correcting intake air temperature provided by the present invention have been described in detail above. The principles and implementations of the present invention are described with specific examples in this paper. The descriptions of the above embodiments are only used for Help to understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification It should not be construed as a limitation of the present invention.

It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, refer to each other Can. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

It should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply those entities or operations There is no such actual relationship or order between them. Furthermore, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article, or device of a list of elements is included, inherent to, or is also included for, those processes. , method, article or device inherent elements. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. An intake air temperature correction method applied to an engine controller includes:

determining the current working condition of the engine;

determining the current absorbed heat of the air inlet temperature sensor under the current working condition, wherein the current absorbed heat is used for representing the heat absorbed by the air inlet temperature sensor under the influence of the current heat radiation;

and correcting the intake air temperature measured by the intake air temperature sensor according to the current heat absorption.

2. The method of claim 1, wherein said determining a current operating condition of the engine comprises:

acquiring the current rotating speed and the current oil injection quantity of the engine;

and determining the current working condition according to the current rotating speed and the current fuel injection quantity.

3. The method of claim 1, wherein the determining the current amount of heat absorbed by the intake air temperature sensor under the current operating condition comprises:

the corresponding relation between the preset working condition and the absorbed heat is adjusted;

and determining the current absorbed heat corresponding to the current working condition according to the corresponding relation.

4. The method of claim 1, wherein said modifying the intake air temperature measured by the intake air temperature sensor based on the current amount of heat absorbed comprises:

calculating the temperature rise of the air inlet temperature sensor according to the current heat absorption quantity;

and taking the difference value between the intake air temperature measured by the intake air temperature sensor and the temperature rise as the actual intake air temperature.

5. An intake air temperature correction device characterized by comprising: the device comprises a first determining module, a second determining module and a correcting module;

the first determination module is used for determining the current working condition of the engine;

the second determining module is used for determining the current absorbed heat of the air inlet temperature sensor under the current working condition, and the current absorbed heat is used for representing the heat absorbed by the air inlet temperature sensor under the influence of the current heat radiation;

and the correction module is used for correcting the intake air temperature measured by the intake air temperature sensor according to the current heat absorption.

6. The apparatus of claim 5, wherein the first determining module is specifically configured to:

acquiring the current rotating speed and the current oil injection quantity of the engine; and determining the current working condition according to the current rotating speed and the current fuel injection quantity.

7. The apparatus of claim 5, wherein the second determining module is specifically configured to:

the corresponding relation between the preset working condition and the absorbed heat is adjusted; and determining the current absorbed heat corresponding to the current working condition according to the corresponding relation.

8. The apparatus of claim 5, wherein the modification module is specifically configured to:

calculating the temperature rise of the air inlet temperature sensor according to the current heat absorption quantity; and taking the difference value between the intake air temperature measured by the intake air temperature sensor and the temperature rise as the actual intake air temperature.

9. An engine controller, comprising: a memory and a processor;

the memory is used for storing programs;

the processor is configured to execute a program stored in the memory, wherein the program is configured to:

determining the current working condition of the engine;

determining the current absorbed heat of the air inlet temperature sensor under the current working condition, wherein the current absorbed heat is used for representing the heat absorbed by the air inlet temperature sensor under the influence of the current heat radiation;

and correcting the intake air temperature measured by the intake air temperature sensor according to the current heat absorption.

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