CN111255583A - Protection control method and storage medium for dual-mass flywheel of engine - Google Patents

Abstract

The invention discloses a protection control method and a storage medium for a dual-mass flywheel of an engine, wherein the method comprises the following steps: when the engine is started, judging whether to activate an engine starting completion flag bit; if the engine starting completion flag bit is activated, the engine is disconnected from the starter, and the engine enters the running working condition; if the engine starting completion flag bit is not activated, judging whether the engine starting time exceeds a first threshold value; if the starting time of the engine exceeds a first threshold value, stopping starting the engine; if the starting time of the engine does not exceed the first threshold value and the engine is detected to be disconnected from the starter, calculating the time that the rotating speed of the engine is lower than the resonant rotating speed of the engine; and judging whether the time that the rotating speed of the engine is lower than the resonant rotating speed of the engine exceeds a second threshold value, if so, stopping starting the engine, and if not, continuing to start the engine. The invention effectively prevents the dual-mass flywheel from being damaged due to the resonance of the dual-mass flywheel and the engine.

Description

Protection control method and storage medium for engine dual-mass flywheel

technical field

The invention relates to the technical field of engine control, in particular to a protection control method and a storage medium for a dual-mass flywheel of an engine.

Background technique

A Double Mass Flywheel (DMF) is a device that connects an engine and a transmission, and is used to reduce vibration and noise in an automotive powertrain. The dual-mass flywheel device mainly includes a first mass part and a second mass part, the first mass part is set on the engine, and is used for starting and transmitting the rotational torque of the engine; the second mass part is set on the gearbox, which is used to improve the transmission speed. Moment of inertia. In most cases, the resonant speed of the dual-mass flywheel is outside the speed range of the engine during normal operation. The vibration of the vehicle power train is particularly severe only when the engine is started and stopped. This is due to the process of starting and stopping the engine. The speed of the engine must pass through the resonance speed of the engine. If the engine cannot quickly pass through the resonance speed, it will easily cause the resonance of the dual-mass flywheel to form torque, which will cause damage to the dual-mass flywheel, and thus the power of the engine cannot be effectively transmitted.

Chinese Patent Publication No. 105649800A "Method and Apparatus for Protecting a Dual Mass Flywheel of a Vehicle", which discloses comparing the RPM of the vehicle engine with a threshold set to avoid the resonance point of the DMF by a controller. If the RPM of the engine is less than a threshold, fuel injection into the engine is turned off by the controller to stop the engine. After fuel injection is turned off, it is determined by the controller whether fuel injection conditions are met for starting the engine. If the fuel injection conditions are met, the controller resumes fuel injection in the engine to start the engine. This published patent aims to protect the dual-mass flywheel during engine operation. However, during the engine startup process, the dual-mass flywheel is not effectively protected, and during the startup process, the rotational speed of the engine must pass through the resonant rotational speed of the engine. .

Specifically, during the starting process of the engine, the rotational speed of the engine increases from zero to 600-700 rpm. If the dual-mass flywheel is protected by the method of the published patent, when the rotational speed of the engine exceeds 700 rpm, the engine is ready to inject fuel. , When the engine cylinder judgment is completed, that is, after the engine is successfully synchronized, the engine starts to inject fuel. However, during the starting process of the engine, since the maximum speed of the starter is generally 500rpm, the engine starts on the premise that the engine does not inject fuel. During the process, the starter cannot drive the engine speed to 700rpm. It can be seen that the disclosed patent cannot protect the dual-mass flywheel when the engine is started.

It is necessary to protect at least the dual-mass flywheel during the start-up, operation and flameout of the engine.

SUMMARY OF THE INVENTION

Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a protection control method and storage medium for the dual-mass flywheel of an engine, at least during the starting process of the engine, a protection strategy for the dual-mass flywheel is set to prevent the dual-mass flywheel from interacting with the engine. Resonance causes damage to the dual-mass flywheel.

In order to achieve the above object, in the first aspect, the embodiment of the present invention provides a protection and control method for an engine dual-mass flywheel, and the protection and control method includes the following steps:

When the engine starts, determine whether to activate the engine start completion flag;

If the engine start completion flag is activated, the engine is disconnected from the starter, and the engine enters the operating condition;

If the engine start completion flag is not activated, determine whether the engine start time exceeds a first threshold;

if the time for the engine to start exceeds a first threshold, stop starting the engine;

If the time when the engine is started does not exceed the first threshold, and it is detected that the engine is disconnected from the starter, calculating the time when the rotational speed of the engine is lower than the resonant rotational speed of the engine;

It is judged whether the time when the rotational speed of the engine is lower than the resonance rotational speed of the engine exceeds a second threshold value, if yes, stop starting the engine, if not, continue to start the engine.

On the basis of the above technical solution, if the start time of the engine does not exceed the first threshold, and it is detected that the engine is disconnected from the starter, it is calculated that the speed of the engine is lower than the resonance of the engine The specific steps of the rotation time are:

If the time when the engine is started does not exceed a first threshold, detecting the disconnection state of the engine and the starter;

According to the detected disengagement state, it is judged whether the engine is disengaged from the starter, if so, calculate the time when the engine speed is lower than the engine resonance speed, if not, continue to start the engine.

On the basis of the above technical solution, the protection control method further comprises the steps:

When the engine is running, it is determined whether the time when the running speed of the engine is lower than the resonance speed of the engine exceeds a third threshold, and if so, stop and start the engine, otherwise, continue to run the engine.

On the basis of the above technical solution, the protection control method further comprises the steps:

requesting a flameout, and determining whether the engine is completely stopped;

the engine controller does not respond to a command to start the engine if the engine has not completely stopped rotating;

If the engine completely stops rotating, judging whether the time when the engine completely stops rotating exceeds a fourth threshold;

If the time for which the engine is stopped exceeds a fourth threshold, the engine controller is responsive to a command to start the engine during the shutdown process, the engine is coupled to the starter;

The engine controller does not respond to the command to start the engine if the time the engine has been stopped does not exceed a fourth threshold.

On the basis of the above technical solution, the specific steps for judging whether to activate the engine start completion flag are as follows:

start the engine;

Detecting the rotational speed of the engine, and judging whether the rotational speed of the engine exceeds the preset rotational speed, and if so, calculating the time during which the rotational speed of the engine exceeds the preset rotational speed;

It is judged whether the time when the rotation speed of the engine exceeds the preset rotation speed exceeds the preset time, and if so, the engine start-up completion flag is activated, the engine controller controls the engine to disconnect the starter, and the engine enters the running mode. condition.

On the basis of the above technical solution, the preset rotational speed is 600-700 rpm, and the preset time is 0.2 s.

Based on the above technical solutions, the first threshold is 7-10s; the second threshold is 0.7-1.0s.

Based on the above technical solution, the third threshold is 0.08-0.15s.

Based on the above technical solutions, the fourth threshold is 0.08-0.15s.

In a second aspect, an embodiment of the present invention further provides a storage medium, where a computer program is stored thereon, and when the computer program is executed by a processor, the above-mentioned protection and control method for a dual-mass flywheel of an engine is implemented.

Compared with the prior art, the advantages of the present invention are:

(1) The present invention provides a protection and control method for the dual-mass flywheel of an engine. The protection strategy of the dual-mass flywheel is set during the starting process of the engine to prevent the dual-mass flywheel from resonating with the engine and causing damage to the dual-mass flywheel. When the engine is started, the invention can protect the dual-mass flywheel in the whole process during the start-up process of the engine according to the resonance speed of the engine, the engine start-up time and the engine speed parameters detected in real time, so as to avoid the dual-mass flywheel and the engine. form resonance.

(2) In the present invention, when the engine is running, it is determined whether the engine is running according to the time when the running speed of the engine is lower than the resonance speed of the generator. When the engine runs abnormally during the running process of the engine, it can avoid the dual-mass flywheel and the The engine resonates.

(3) In the present invention, the engine is requested to be turned off, and according to the time when the engine stops rotating, it is determined whether the engine responds to the command to start the engine, so as to prevent the dual-mass flywheel from resonating with the engine when the engine is turned off.

Description of drawings

1 is a flow chart of a protection control method for an engine dual-mass flywheel when an engine is started in an embodiment of the present invention;

FIG. 2 is a flowchart of a protection control method for an engine dual-mass flywheel when the engine is turned off according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

An embodiment of the present invention provides a protection and control method for an engine dual-mass flywheel, and the protection and control method includes the following steps:

When the engine starts, determine whether to activate the engine start completion flag;

If the engine start completion flag is activated, the engine is disconnected from the starter, and the engine enters the operating condition;

If the engine start completion flag is not activated, determine whether the engine start time exceeds a first threshold;

if the time for the engine to start exceeds a first threshold, stop starting the engine;

If the time when the engine is started does not exceed the first threshold, and it is detected that the engine is disconnected from the starter, calculating the time when the rotational speed of the engine is lower than the resonant rotational speed of the engine;

It is judged whether the time when the rotational speed of the engine is lower than the resonance rotational speed of the engine exceeds a second threshold value, if yes, stop starting the engine, if not, continue to start the engine.

The embodiment of the present invention provides a protection and control method for the dual-mass flywheel of an engine. The protection strategy of the dual-mass flywheel is set during the starting process of the engine to prevent the dual-mass flywheel from resonating with the engine and causing damage to the dual-mass flywheel. When the engine is started, the invention can protect the dual-mass flywheel in the whole process during the start-up process of the engine according to the resonance speed of the engine, the engine start-up time and the engine speed parameters detected in real time, so as to avoid the dual-mass flywheel and the engine. form resonance.

Example 1

An embodiment of the present invention provides a protection and control method for an engine dual-mass flywheel, wherein the first threshold is 7 to 10 s. The second threshold is 0.7-1.0s. In a large number of experiments, we found that the first threshold is in the range of 7-10s, the second threshold is in the range of 0.7-1.0s, and the protection control method can basically meet the requirements for the protection of the dual-mass flywheel.

Preferably, if the time when the engine is started does not exceed a first threshold, and it is detected that the engine is disconnected from the starter, the specific method for calculating the time when the rotational speed of the engine is lower than the resonance rotational speed of the engine The steps are:

If the time when the engine is started does not exceed a first threshold, detecting the disconnection state of the engine and the starter;

According to the detected disengagement state, it is judged whether the engine is disengaged from the starter, if so, calculate the time when the engine speed is lower than the engine resonance speed, if not, continue to start the engine.

Specifically, as shown in FIG. 1 , an embodiment of the present invention provides a protection and control method for an engine dual-mass flywheel, and the protection and control method includes the following steps:

Step S100: start the engine, and go to step S101;

Step S101: when the engine is started, determine whether to activate the engine start-up completion flag, if yes, go to step S102; if not, go to step S103;

Step S102: the engine controller disconnects the engine from the starter, and the engine enters a running condition;

Step S103: determine whether the engine start time exceeds the first threshold of 8s, if yes, go to step S104; if not, go to step S105;

Step S104: stop and start the engine; that is, the engine controller sends a stop command, stops the engine fuel injection and ignition, and the engine stops;

Step S105: Detect the disengagement state of the engine and the starter, the disengagement state includes two kinds of disengagement of the engine and the starter, and combination of the engine and the starter, and go to step S106;

Step S106: According to the detected disconnection state, determine whether the engine is disconnected from the starter, if yes, go to step S107; if not, go to step S108;

Step S107: Continue to start the engine.

Step S108: Calculate the time when the engine speed is lower than the engine resonance speed by 500 rpm, and go to step S109;

Step S109: Determine whether the time when the engine speed is lower than the engine resonance speed of 500rpm exceeds the second threshold value of 0.8s, if so, go to the step S104; if not, go to the step S107.

Example 2

The basic content is the same as that of Example 1, except that:

An embodiment of the present invention provides a protection and control method for an engine dual-mass flywheel. The specific steps of step S101 of the protection and control method are as follows:

start the engine;

Detecting the rotational speed of the engine, and judging whether the rotational speed of the engine exceeds the preset rotational speed, and if so, calculating the time during which the rotational speed of the engine exceeds the preset rotational speed;

It is judged whether the time when the rotation speed of the engine exceeds the preset rotation speed exceeds the preset time, and if so, the engine start completion flag is activated, the engine controller controls the engine to disconnect the starter, and the engine enters the running condition.

Preferably, the preset rotational speed is 600-700 rpm; and the preset time is 0.2s.

In this embodiment, if the speed of the engine exceeds the preset speed of 650rpm, and the time when the speed of the engine exceeds the preset speed of 650rpm exceeds the preset time of 0.2s, it means that the engine start completion flag is activated. Generally speaking, except for the starter fault or protection, the working time of the starter is not less than the minimum working time of 0.2s, wherein the protection of the starter is by limiting the minimum power-on time of the starter relay, so the preset time is 0.2s .

Example 3

The basic content is the same as that of Example 1, except that:

The protection control method further includes the steps:

When the engine is running, it is determined whether the time when the running speed of the engine is lower than the resonance speed of the engine exceeds a third threshold, and if so, stop and start the engine, otherwise, continue to run the engine.

In this embodiment, the operation refers to a state in which the engine start completion flag of the engine has been activated and the engine is not requested to be turned off.

The embodiment of the present invention provides a protection and control method for an engine dual-mass flywheel, and the protection and control method further specifically includes the following steps:

When the engine is running, it is determined whether the time when the running speed of the engine is lower than the resonance speed of the engine exceeds a third threshold, and if so, go to the step S104, otherwise, continue to run the engine.

Preferably, the third threshold is 0.08-0.15s.

In this embodiment, after the engine start completion flag is activated, it indicates that the engine starts successfully, and the starter does not need to continue to work, the engine controller issues a disconnection command to control the engine to disconnect the starter, and the engine speed exceeds the engine resonance The rotation speed is 500rpm, so that the engine enters the operating condition; after the engine enters the operating condition, if the time when the operating speed of the engine is lower than the resonant rotation speed 500rpm of the engine exceeds the third threshold for 0.1s, the engine controller issues a shutdown Command, stop fuel injection ignition, stop starting the engine, ie stop the engine.

It can be seen that in the protection control method, when the engine is running, the running speed of the detection object engine is the same as the starting speed of the detection object engine when the engine is started, and the detection object is obtained in the same way. The time of the resonant rotational speed of the engine determines whether the engine is running, which can be seamlessly connected with the strategy of the engine when it is started, so as to avoid resonance between the dual-mass flywheel and the engine during the starting and running of the engine.

Example 4

The basic content is the same as that of Example 1, except that:

The protection control method further includes the steps:

requesting a flameout, and determining whether the engine is completely stopped;

the engine controller does not respond to a command to start the engine if the engine has not completely stopped rotating;

If the engine completely stops rotating, judging whether the time when the engine completely stops rotating exceeds a fourth threshold;

If the time for which the engine is stopped exceeds a fourth threshold, the engine controller is responsive to a command to start the engine during the shutdown process, the engine is coupled to the starter;

The engine controller does not respond to the command to start the engine if the time the engine has been stopped does not exceed a fourth threshold.

Referring to Fig. 2, by way of example, the protection control method further includes the steps:

Step S200: request the engine to turn off, and go to step S201;

Step S201: determine whether the engine is completely stopped, if so, go to step S203; if not, go to step S202;

Step S202: the engine controller does not respond to the command to start the engine;

Step S203: determine whether the time when the engine completely stops rotating exceeds the fourth threshold, if so, go to step S204; otherwise, go to step S202;

Step S204: The engine controller responds to the command to start the engine during the shutdown process, the engine is combined with the starter.

Preferably, the fourth threshold is 0.08-0.15s.

In this embodiment, when the flameout switch is pressed, and the engine is in the process of flameout, the engine does not completely stop rotating, that is, when the engine speed is not zero, the engine controller does not respond to the manual command to start the engine, at this time, the starter It is not combined with the engine, the engine does not inject fuel and does not ignite, and the possibility of resonance between the dual-mass flywheel and the engine is prohibited. Until the engine speed is zero and the time when the speed is zero exceeds the fourth threshold of 0.1s, the engine controller will respond in the process of flameout. The command to start the engine, at this time, the starter is combined with the engine, and the engine is started.

It can be seen that in the protection control method, when the engine is turned off, the rotational speed of the detection object engine is the same as the detection object when the engine is started and running. By determining whether the engine is combined with the starter according to the time when the engine stops rotating, It can work together with the strategy of the engine during startup and operation to avoid resonance between the dual-mass flywheel and the engine during the process of engine startup, operation and flameout.

Example 5

The basic content is the same as that of Example 1, except that:

An embodiment of the present invention provides a storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the protection and control method for a dual-mass flywheel of an engine according to any one of Embodiments 1 to 5 is implemented.

It should be noted that the storage medium includes U disk, mobile hard disk, ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random access memory), magnetic disk or optical disk and other kinds of programs that can store programs medium of code. When the computer programs stored in these storage rings are executed, the methods of the above embodiments are implemented.

The present invention is not limited to the above-mentioned embodiments. For those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection of the present invention. within the range. Contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims (10)

1. A protection control method for a dual-mass flywheel of an engine is characterized by comprising the following steps:

when the engine is started, judging whether to activate an engine starting completion flag bit;

if the engine starting completion flag bit is activated, the engine is disconnected from a starter, and the engine enters the running working condition;

if the engine starting completion flag bit is not activated, judging whether the engine starting time exceeds a first threshold value;

if the starting time of the engine exceeds a first threshold value, stopping starting the engine;

if the starting time of the engine does not exceed a first threshold value and the engine is detected to be disconnected from the starter, calculating the time when the rotating speed of the engine is lower than the resonant rotating speed of the engine;

and judging whether the time that the rotating speed of the engine is lower than the resonant rotating speed of the engine exceeds a second threshold value, if so, stopping starting the engine, and if not, continuing to start the engine.

2. The method for protecting and controlling the dual mass flywheel of the engine as claimed in claim 1, wherein if the time for starting the engine does not exceed a first threshold value and it is detected that the engine is disengaged from the starter, the specific step of calculating the time for the rotation speed of the engine to be lower than the resonance rotation speed of the engine is:

if the time for starting the engine does not exceed a first threshold value, detecting a disengagement state of the engine and the starter;

and judging whether the engine is disconnected from the starter according to the detected disconnection state, if so, calculating the time when the rotating speed of the engine is lower than the resonance rotating speed of the engine, and if not, continuing to start the engine.

3. The protection control method for a dual mass flywheel of an engine according to claim 1, characterized by further comprising the steps of:

and when the engine runs, judging whether the time that the running rotating speed of the engine is lower than the resonance rotating speed of the transmitter exceeds a third threshold value, if so, stopping starting the engine, otherwise, continuing to run the engine.

4. The protection control method for a dual mass flywheel of an engine according to claim 1, characterized by further comprising the steps of:

requesting flameout and judging whether the engine completely stops rotating or not;

if the engine does not completely stop rotating, the engine controller does not respond to an instruction for starting the engine;

if the engine completely stops rotating, judging whether the time for completely stopping rotating of the engine exceeds a fourth threshold value;

if the time for the engine to completely stop rotating exceeds a fourth threshold, an engine controller responds to an instruction to start the engine during a flameout process, the engine being coupled to the starter;

if the time for which the engine stops rotating does not exceed the fourth threshold, the engine controller does not respond to the command to start the engine.

5. The method for protecting and controlling the dual mass flywheel of the engine as claimed in claim 1, wherein the specific step of judging whether to activate the engine start completion flag bit is:

starting the engine;

detecting the rotating speed of the engine, judging whether the rotating speed of the engine exceeds a preset rotating speed or not, and if so, calculating the time when the rotating speed of the engine exceeds the preset rotating speed;

and judging whether the time that the rotating speed of the engine exceeds the preset rotating speed exceeds the preset time, if so, activating the engine starting completion flag bit, and controlling the engine to be disconnected from the starter by an engine controller, so that the engine enters the running working condition.

6. The protection control method for the dual-mass flywheel of the engine as claimed in claim 5, wherein the preset rotating speed is 600-700 rpm; the preset time is 0.2 s.

7. The method for protecting and controlling the dual mass flywheel of the engine according to claim 1, wherein the first threshold value is 7-10 s; the second threshold value is 0.7-1.0 s.

8. The method for protecting and controlling the dual mass flywheel of the engine as claimed in claim 1, wherein the third threshold value is 0.08-0.15 s.

9. The method for protecting and controlling the dual mass flywheel of the engine as claimed in claim 1, wherein the fourth threshold value is 0.08-0.15 s.

10. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a method of controlling protection of a dual mass flywheel of an engine according to any one of claims 1 to 9.

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