CN108119249A - BSG cluster engines and its startup control method and control device - Google Patents

Abstract

The present application discloses a starting control method for a BSG engine set, which includes: obtaining the temperature of the coolant in response to the engine start command; determining the fuel injection time of the engine according to the temperature of the coolant; At the time of fuel injection, send the engine fuel injection command to control the engine to perform fuel injection operation. Based on the start-up control method disclosed in the present application, the fuel consumption during engine start-up can be reduced. The application also discloses the BSG engine group and its control device.

Description

BSG engine group and its starting control method and control device

technical field

The present application belongs to the field of engine technology, and in particular relates to a BSG engine set and its starting control method and control device.

Background technique

The engine is an important component in a motor vehicle. At present, the starting strategy for the engine is roughly as follows: after receiving the engine starting command, when the fixed fuel injection time is reached, the engine is controlled to start fuel injection, and the basic fuel injection quantity of the engine is determined by the temperature of the engine coolant. Among them, the relationship between the temperature of the coolant and the basic fuel injection quantity of the engine is shown in Figure 1.

However, the applicant found that the current starting strategy for the engine has the disadvantage of high fuel consumption. How to reduce the fuel consumption in the process of starting the engine is an urgent problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the purpose of the present application is to provide a start-up control method, a control device and a BSG engine set of a BSG engine set, so as to reduce fuel consumption during engine start-up.

In order to achieve the above object, the application provides the following technical solutions:

The application provides a starting control method of a BSG engine group, including:

Obtaining the temperature of the coolant of the BSG engine block in response to an engine start command;

Determine the fuel injection timing of the engine in the BSG engine group according to the temperature of the coolant, wherein, when the first temperature value is higher than the second temperature value, the fuel injection timing corresponding to the first temperature value is later The fuel injection timing corresponding to the second temperature value;

Start the motor in the BSG engine set, and the motor will drag the engine backwards to run;

When the fuel injection timing is reached, an engine fuel injection command is sent to control the engine to perform a fuel injection operation.

Optionally, in the above startup control method, the determining the fuel injection timing of the engine in the BSG engine group according to the temperature of the coolant includes:

Determining the fuel injection timing of the engine by using the temperature of the coolant, and the pre-built mapping relationship between the temperature of the coolant and the fuel injection timing of the engine;

Wherein, in the mapping relationship, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value lower than the first temperature value.

Optionally, in the above starting control method, further comprising: pre-constructing a mapping relationship between the temperature of the coolant and the fuel injection timing of the engine.

The present application also provides a control device for a BSG engine group, comprising:

a temperature obtaining unit, configured to obtain the temperature of the coolant of the BSG engine block in response to an engine start command;

a fuel injection timing determination unit, configured to determine the fuel injection timing of the engines in the BSG engine group according to the temperature of the coolant, wherein, when the first temperature value is higher than the second temperature value, the first The fuel injection timing corresponding to the temperature value is later than the fuel injection timing corresponding to the second temperature value;

The first control unit is used to start the motor in the BSG engine set, and the motor is driven backwards to run the engine;

The second control unit is configured to send an engine fuel injection command when the fuel injection timing is reached, so as to control the engine to perform fuel injection operation.

Optionally, in the above control device, the fuel injection timing determining unit is specifically used for:

Determining the fuel injection timing of the engine by using the temperature of the coolant, and the pre-built mapping relationship between the temperature of the coolant and the fuel injection timing of the engine;

Wherein, in the mapping relationship, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value lower than the first temperature value.

Optionally, on the basis of the above control device, a preprocessing unit may also be provided for pre-constructing the mapping relationship between the temperature of the coolant and the fuel injection timing of the engine.

The application also provides a BSG engine set, including a motor, an engine and a control device;

The motor and the engine are driven by a belt;

The control device is used to: respond to the engine start command, obtain the temperature of the coolant of the BSG engine group; determine the fuel injection timing of the engine according to the temperature of the coolant, wherein, when the first temperature value is lower than the second In the case of two temperature values, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value; start the motor, and the motor will drag the engine backward; At the fuel injection timing, an engine fuel injection command is sent to control the engine to perform fuel injection operation.

This shows that the beneficial effect of the application is:

The starting control method of the BSG engine group disclosed in the present application obtains the temperature of the coolant after receiving the engine start instruction, and determines the fuel injection timing of the engine according to the temperature of the coolant, wherein the higher the temperature of the coolant, the faster the The later the fuel injection time is, when the determined fuel injection time is reached, the engine fuel injection command is sent to control the engine fuel injection, so as to complete the start of the engine.

It can be seen that the startup control method disclosed in the present application determines the fuel injection timing of the engine according to the temperature of the coolant, and the fuel injection timing of the engine determined based on this method is later than the fixedly set engine fuel injection timing in the prior art. Therefore, when the fuel injection timing is reached, the engine speed is higher, and the fuel injection quantity of the engine is also lower, so the fuel consumption during engine startup can be reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the 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 application, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is the schematic diagram of the relationship between the temperature of the coolant and the basic fuel injection quantity of the engine in the prior art;

Fig. 2 is the flow chart of the startup control method of a kind of BSG engine set disclosed by the present application;

Fig. 3 is a structural schematic diagram of the BSG engine block;

4 is a schematic diagram of the relationship between the fuel injection timing of the engine, the fuel injection quantity and the temperature of the coolant during the start-up of the BSG engine group based on the start-up control method disclosed in the present application;

Fig. 5 is the structural diagram of the control device of a kind of BSG engine group disclosed by the present application;

Fig. 6 is a structural diagram of another control device for a BSG engine set disclosed in the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The present application discloses a starting control method of a BSG engine group, so as to reduce the fuel consumption during the starting process of the engine.

Referring to FIG. 2 , FIG. 2 is a start-up control method of a BSG engine set disclosed in the present application.

Among them, the English name of the BSG engine set is Belt Starter Generator, also known as the all-in-one machine with belt drive. The basic structure of the BSG engine set is shown in Figure 3, including the engine and the motor, which are driven by a belt.

The launch control method includes:

Step S1: Obtain the temperature of the coolant of the BSG engine block in response to the engine start command.

Step S2: Determine the fuel injection timing of the engine in the BSG engine group according to the temperature of the coolant. Wherein, when the first temperature value is lower than the second temperature value, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value.

Step S3: Start the motor in the BSG engine set, and the motor will drive the engine backwards to run.

After receiving the engine start command, in response to the received engine start command, obtain the temperature of the coolant of the BSG engine group, determine the fuel injection timing of the engine according to the temperature of the coolant, and respond to the received engine start command, start the motor, The engine is driven by the motor in reverse.

It should be noted that the fuel injection timing of the engine is determined by the temperature of the coolant, the higher the temperature of the coolant, the later the fuel injection timing of the engine. That is to say, if the first temperature value is higher than the second temperature value, the fuel injection time of the engine corresponding to the first temperature value of the coolant temperature will be later than that corresponding to the second temperature value of the coolant temperature. fuel injection timing of the engine.

In addition, the later the fuel injection time of the engine, the higher the engine speed when the fuel injection time is reached, and correspondingly, the lower the fuel injection quantity of the engine.

Figure 4 shows the relationship between the fuel injection timing of the engine, the fuel injection quantity and the temperature of the coolant during the start-up of the BSG engine group. It can be seen from Figure 4 that the higher the temperature of the coolant, the later the fuel injection timing of the engine, and correspondingly, the higher the engine speed at the fuel injection timing, the lower the fuel injection quantity of the engine.

Step S4: When the fuel injection time is reached, send an engine fuel injection command to control the engine fuel injection.

When the fuel injection timing determined above is reached, the engine fuel injection command is sent to control the engine fuel injection, the engine starts successfully, and then the engine speed remains at the idling condition.

The starting control method of the BSG engine group disclosed in the present application obtains the temperature of the coolant after receiving the engine start instruction, and determines the fuel injection timing of the engine according to the temperature of the coolant, wherein the higher the temperature of the coolant, the faster the The later the fuel injection time is, when the determined fuel injection time is reached, the engine fuel injection command is sent to control the engine fuel injection, so as to complete the start of the engine.

It can be seen that the startup control method disclosed in the present application determines the fuel injection timing of the engine according to the temperature of the coolant, and the fuel injection timing of the engine determined based on this method is later than the fixedly set engine fuel injection timing in the prior art. Therefore, when the fuel injection timing is reached, the engine speed is higher, and the fuel injection quantity of the engine is also lower, so the fuel consumption during engine startup can be reduced.

As an implementation, step S2 determines the fuel injection timing of the engine in the BSG engine group according to the temperature of the coolant, in the following manner:

The fuel injection timing of the engine is determined by using the temperature of the coolant and the pre-built mapping relationship between the temperature of the coolant and the fuel injection timing of the engine.

Wherein, in the mapping relationship, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value lower than the first temperature value.

Optionally, on the basis of the start-up control method disclosed above in the present application, the following step may also be set: constructing a mapping relationship between the temperature of the coolant and the fuel injection timing of the engine in advance.

During implementation, the optimal engine fuel injection timing at different coolant temperatures can be determined through multiple tests, and a mapping relationship between the temperature of the coolant and the fuel injection timing of the engine can be constructed accordingly.

The present application also discloses a control device for a BSG engine set. The following description about the control device and the above description about the start-up control method can be referred to each other.

Referring to FIG. 5 , FIG. 5 is a structural diagram of a control device for a BSG engine set disclosed in the present application. The control device includes a temperature acquisition unit 101 , an injection timing determination unit 102 , a first control unit 103 and a second control unit 104 .

in:

The temperature obtaining unit 101 is used for obtaining the temperature of the coolant of the BSG engine block in response to an engine start command.

The fuel injection timing determination unit 102 is used to determine the fuel injection timing of the engines in the BSG engine group according to the temperature of the coolant. Wherein, when the first temperature value is lower than the second temperature value, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value.

The first control unit 103 is used to start the motor in the BSG engine set, and the motor runs backwards with the engine.

The second control unit 104 is used for sending an engine fuel injection instruction to control engine fuel injection when the fuel injection timing is reached.

The control device of the BSG engine group disclosed in the present application determines the fuel injection timing of the engine according to the temperature of the coolant, and the fuel injection timing of the engine determined based on this method is later than the fixedly installed engine fuel injection timing in the prior art, so , when the fuel injection timing is reached, the engine speed is higher, and the fuel injection quantity of the engine is also lower, so the fuel consumption during engine startup can be reduced.

As an implementation manner, the fuel injection timing determination unit 102 is specifically configured to: determine the fuel injection timing of the engine by using the temperature of the coolant and a pre-built mapping relationship between the temperature of the coolant and the fuel injection timing of the engine.

Wherein, in the mapping relationship, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value lower than the first temperature value.

Optionally, on the basis of the control device disclosed above in the present application, a preprocessing unit 105 may also be provided, as shown in FIG. 6 . The pre-processing unit 105 is used to pre-build a mapping relationship between the temperature of the coolant and the fuel injection timing of the engine.

During implementation, the optimal engine fuel injection timing at different coolant temperatures can be determined through multiple tests, and a mapping relationship between the temperature of the coolant and the fuel injection timing of the engine can be constructed accordingly.

The present application also discloses a BSG engine set, including a motor, an engine and a control device, the structure of which can be seen in FIG. 3 .

in:

The motor and engine are driven by belts.

The control device is used to: respond to the engine start command, obtain the temperature of the coolant of the BSG engine group; determine the fuel injection timing of the engine according to the temperature of the coolant, wherein, when the first temperature value is lower than the second temperature value, the second The fuel injection time corresponding to the first temperature value is later than the fuel injection time corresponding to the second temperature value; the motor is started, and the motor drives the engine backward; when the fuel injection time is reached, the engine fuel injection command is sent to control the engine fuel injection.

It should be noted that, for the specific processing process of the control device, reference may be made to the foregoing description about the startup control method.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not 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 (7)

1. A start-up control method of a BSG engine group, characterized in that, comprising: Obtaining the temperature of the coolant of the BSG engine block in response to an engine start command; Determine the fuel injection timing of the engine in the BSG engine group according to the temperature of the coolant, wherein, when the first temperature value is higher than the second temperature value, the fuel injection timing corresponding to the first temperature value is later The fuel injection timing corresponding to the second temperature value; Start the motor in the BSG engine set, and the motor will drag the engine backwards to run; When the fuel injection timing is reached, an engine fuel injection command is sent to control the engine to perform a fuel injection operation. 2. The startup control method according to claim 1, wherein the determining the fuel injection timing of the engine in the BSG engine group according to the temperature of the coolant comprises: Determining the fuel injection timing of the engine by using the temperature of the coolant, and the pre-built mapping relationship between the temperature of the coolant and the fuel injection timing of the engine; Wherein, in the mapping relationship, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value lower than the first temperature value. 3. The startup control method according to claim 2, further comprising: The mapping relationship between the temperature of the coolant and the fuel injection timing of the engine is constructed in advance. 4. A control device for a BSG engine group, characterized in that it comprises: a temperature obtaining unit, configured to obtain the temperature of the coolant of the BSG engine block in response to an engine start command; a fuel injection timing determination unit, configured to determine the fuel injection timing of the engines in the BSG engine group according to the temperature of the coolant, wherein, when the first temperature value is higher than the second temperature value, the first The fuel injection timing corresponding to the temperature value is later than the fuel injection timing corresponding to the second temperature value; The first control unit is used to start the motor in the BSG engine set, and the motor is driven backwards to run the engine; The second control unit is configured to send an engine fuel injection command when the fuel injection timing is reached, so as to control the engine to perform fuel injection operation. 5. The control device according to claim 4, characterized in that the fuel injection timing determination unit is specifically used for: Determining the fuel injection timing of the engine by using the temperature of the coolant, and the pre-built mapping relationship between the temperature of the coolant and the fuel injection timing of the engine; Wherein, in the mapping relationship, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value lower than the first temperature value. 6 . The control device according to claim 5 , further comprising a pre-processing unit, configured to pre-build a mapping relationship between the temperature of the coolant and the fuel injection timing of the engine. 7 . 7. A BSG engine group, characterized in that, comprises a motor, a motor and a control device; The motor and the engine are driven by a belt; The control device is used to: respond to the engine start command, obtain the temperature of the coolant of the BSG engine group; determine the fuel injection timing of the engine according to the temperature of the coolant, wherein, when the first temperature value is lower than the second In the case of two temperature values, the fuel injection timing corresponding to the first temperature value is later than the fuel injection timing corresponding to the second temperature value; start the motor, and the motor will drag the engine backward; At the fuel injection timing, an engine fuel injection command is sent to control the engine to perform fuel injection operation.