Diesel engine starting control method and control system

Abstract

The invention provides a diesel engine starting control method and system.The method comprises the steps that a starting motor drives a diesel engine to start through a transmission mechanism, and the rotating speed of the diesel engine is detected in real time; controlling the transmission mechanism to start first-stage transmission separation of the motor and the diesel engine in response to the diesel engine rotating speed greater than a first preset threshold value; controlling the transmission mechanism to start second-stage transmission separation of the motor and the diesel engine in response to the diesel engine rotating speed greater than a second preset threshold value; in response to both the first stage transmission disengagement and the second stage transmission disengagement being successful, it is determined that the starter motor disengagement is successful. According to the staged disengaging method, when the diesel engine reaches the ignition rotating speed, the starting motor gear and the diesel engine flywheel gear are controlled to be retreated to be in the semi-meshing state so that the contact area between meshing gears can be reduced, and then the follow-up gear retreating operation can be easier.

Description

Technical Field

[0001] The invention relates to the field of diesel engine starting control, and in particular to a diesel engine starting control method and control system. Background Art

[0002] The diesel engine of a diesel locomotive must first use external force to rotate the crankshaft of the diesel engine to drive the piston to move repeatedly. The so-called "external force" is usually the starter motor, including the electric starter motor and the wind starter motor. Although the control principles of these two motors are different, the final execution is to control the small gear to slowly extend and mesh with the flywheel ring gear. When fully meshed, the small gear rotates to drive the meshing flywheel ring gear, the flywheel ring gear drives the flywheel, and the flywheel drives the crankshaft. When the diesel engine starts successfully, the starter motor is required to perform the tooth retraction action. Otherwise, when the diesel engine speed increases to a certain value, due to the transmission ratio relationship between the diesel engine flywheel and the starter motor gear, it will cause the starter motor to overspeed and overheat and be damaged.

[0003] However, in the traditional diesel engine starting control method, the starter motor's gear retraction action needs to be performed only when the diesel engine reaches the starting speed. This control method easily leads to the problem of the pinion and flywheel teeth being stuck and difficult to separate. Therefore, how to effectively reduce the risk of sticking and protect the safety of the starter motor when sticking occurs is a technical problem that needs to be solved in this field. Summary of the invention

[0004] In order to reduce the probability of the starter motor gear and the diesel engine gear getting stuck during the diesel engine starting process and to protect the starter motor when the jam occurs, in a first aspect of the present invention, a diesel engine starting control method is proposed, the method comprising: starting the diesel engine by the starter motor through a transmission mechanism, and detecting the diesel engine speed in real time; in response to the diesel engine speed being greater than a first preset threshold, controlling the transmission mechanism to perform a first stage transmission disengagement between the starter motor and the diesel engine; in response to the diesel engine speed being greater than a second preset threshold, controlling the transmission mechanism to perform a second stage transmission disengagement between the starter motor and the diesel engine; in response to both the first stage transmission disengagement and the second stage transmission disengagement being successful, determining that the starter motor disengagement is successful.

[0005] In one or more embodiments, a diesel engine starting control method of the present invention further includes: configuring the first preset threshold to be the ignition speed of the diesel engine, and configuring the second preset threshold to be greater than the first preset threshold.

[0006] In one or more embodiments, in response to the diesel engine speed being greater than a first preset threshold, the transmission mechanism is controlled to perform a first stage of transmission disengagement of the starter motor from the diesel engine, including: in response to the diesel engine speed being greater than a first preset threshold, the starter motor gear in the transmission mechanism is controlled to be retracted to a semi-engaged state with the diesel engine gear.

[0007] In one or more embodiments, in response to the diesel engine speed being greater than a second preset threshold, the transmission mechanism is controlled to perform a second stage of transmission disengagement of the starter motor from the diesel engine, including: in response to the diesel engine speed being greater than a second preset threshold, controlling the starter motor gear in the transmission mechanism to retract to a state of complete disengagement from the diesel engine gear.

[0008] In one or more embodiments, a diesel engine starting control method of the present invention further includes: in response to failure of the first stage transmission disengagement, directly controlling the transmission mechanism to perform a second stage transmission disengagement of the starter motor and the diesel engine.

[0009] In one or more embodiments, a diesel engine starting control method of the present invention further includes: in response to the failure of the second stage transmission disengagement, maintaining the transmission disengagement signal continuously in a high level state and increasing the detection frequency of the diesel engine speed.

[0010] In one or more embodiments, a diesel engine starting control method of the present invention further includes: in response to the second stage transmission disengagement not being successful when the diesel engine speed is greater than a third preset threshold, controlling the diesel engine to stop by a protection device.

[0011] In a second aspect of the present invention, a diesel engine starting control system is proposed, comprising: a controller for executing the steps of the diesel engine starting control method described in any of the above method embodiments; a speed detection device for detecting the speed of a target diesel engine; a distance measuring device for detecting the relative distance between a starter motor gear and the distance measuring device so that the controller controls execution of a first stage transmission disengagement and a second stage transmission disengagement based on the relative distance, and determines whether the first stage transmission disengagement and the second stage transmission disengagement are successful; wherein the speed detection device and the distance measuring device are respectively connected to the controller for communication.

[0012] In one or more embodiments, the distance measuring device includes: an infrared distance measuring device and / or an ultrasonic distance measuring device.

[0013] In one or more embodiments, a diesel engine starting control system of the present invention further includes: a protection device, which is communicatively connected with the controller and is used for controlling the diesel engine to stop running.

[0014] The beneficial effects of the present invention include: the present invention proposes a staged disengagement method, by first controlling the starter motor gear and the diesel engine flywheel teeth to retreat to a semi-engaged state in the first stage when the diesel engine reaches the ignition speed to reduce the contact area between the meshing gears, thereby making the subsequent retreat operation easier, and because the diesel engine's torque demand for the starter motor has been greatly reduced when the ignition speed is reached, it can be ensured that the starter motor in the semi-engaged state can continue to and safely provide a smaller torque when needed; and when it is determined that the second stage disengagement cannot be successful, the gear retreat operation will be continued until the diesel engine speed reaches the safe speed of the starter motor and still cannot be disengaged, and the diesel engine will be controlled to stop to protect the starter motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A working flow chart of a diesel engine starting control method according to an embodiment of the present invention; Figure 2 The figure is a schematic structural diagram of a diesel engine starting control system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0018] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0019] In order to reduce the probability of the starter motor gear and the diesel engine flywheel gear being stuck during the diesel engine starting process and protect the starter motor when the sticking occurs, in one embodiment, the present invention proposes a diesel engine starting control method, such as Figure 1As shown, the method includes: step S1, starting the diesel engine by the starter motor through the transmission mechanism, and detecting the diesel engine speed in real time; step S2, in response to the diesel engine speed being greater than a first preset threshold, controlling the transmission mechanism to perform a first stage transmission disengagement between the starter motor and the diesel; step S3, in response to the diesel engine speed being greater than a second preset threshold, controlling the transmission mechanism to perform a second stage transmission disengagement between the starter motor and the diesel; step S4, in response to the first transmission disengagement and the second transmission disengagement being successful, confirming that the starter motor is disengaged successfully.

[0020] Specifically, the conventional diesel engine starting control method selects to control the starter motor to disengage when the diesel engine speed reaches a certain value between the ignition speed and the operating speed. The reason is that if the starter motor is disengaged immediately after reaching the theoretical ignition speed, the diesel engine may fail to start. If the starter motor is disengaged after the ignition speed, the bite force between the starter motor gear and the diesel engine gear may increase due to the excessively high diesel engine speed, making it difficult to disengage smoothly. To this end, this embodiment proposes a staged disengagement method, which controls the starter motor gear and the diesel engine flywheel gear to be disengaged to a semi-engaged state when the diesel engine reaches the ignition speed to reduce the contact area between the meshing gears, thereby making the subsequent disengagement operation easier. Moreover, since the diesel engine's torque demand for the starter motor has been greatly reduced when the ignition speed is reached, it can be ensured that the starter motor in the semi-engaged state can continue to and safely provide a smaller torque when needed.

[0021] In a further embodiment, the first preset threshold is configured as the ignition speed of the diesel engine, and the second preset threshold is configured to be greater than the first preset threshold. Specifically, the second preset threshold can be selected as the disengagement speed in the traditional solution.

[0022] In a further embodiment, controlling the transmission mechanism to perform a first stage of transmission disengagement of the starter motor and the diesel engine includes: in response to the diesel engine speed being greater than a first preset threshold, controlling the starter motor gear in the transmission mechanism to retract to a semi-engaged state with the diesel engine gear.

[0023] Specifically, the specific implementation of this embodiment is to control the stepper motor in the transmission system to retract the gear until the starter motor gear and the diesel engine gear are in a semi-engaged state, and to detect in real time whether the relative distance between the starter motor gear and the distance measuring device is reduced by a distance measuring device arranged near the starter motor gear; if so, it is determined that the first stage transmission is disengaged successfully; otherwise, it is determined that the first stage transmission is disengaged unsuccessfully. Moreover, when it is determined that the first stage transmission is disengaged successfully, the diesel engine will speed up to the second speed.

[0024] In a further embodiment, in response to the diesel engine speed being greater than a second preset threshold, the transmission mechanism is controlled to perform a second stage of transmission disengagement of the starter motor and the diesel, including: in response to the diesel engine speed being greater than a second preset threshold, the starter motor gear in the transmission mechanism is controlled to retract to a state of complete disengagement from the diesel engine gear.

[0025] Specifically, the specific implementation method of this embodiment is to control the stepper motor in the transmission system to retreat from a semi-engaged state between the starter motor gear and the diesel engine gear to a completely disengaged state, and use a distance measuring device arranged near the starter motor gear to detect in real time whether the relative distance between the starter motor gear and the distance measuring device is further reduced to a preset distance; if so, it is determined that the second stage transmission disengagement is successful; otherwise, it is determined that the second stage transmission disengagement has failed.

[0026] In a further embodiment, the method of the present invention further comprises: in response to the failure of the first stage transmission disengagement, directly controlling the transmission mechanism to perform a second stage transmission disengagement of the starter motor and the diesel engine.

[0027] Specifically, in the present embodiment, when it is found that the first-stage conventional disengagement is unsuccessful, the transmission mechanism is immediately controlled to enter the second-stage transmission disengagement state, so as to try to completely disengage the diesel engine and the starter motor at a low speed to achieve the purpose of pre-disengagement, and it is expected that in the subsequent acceleration process after the diesel engine is injected and ignited, instantaneous disengagement can be achieved when the meshing force between the starter motor gear and the diesel engine gear is minimized.

[0028] In a further embodiment, the method of the present invention further comprises: in response to the failure of the second stage transmission disengagement, maintaining the transmission disengagement signal continuously in a high level state, and increasing the detection frequency of the diesel engine speed.

[0029] Specifically, in this embodiment, the transmission disengagement signal is kept in a high level state to control the stepper motor to continuously produce the tooth retraction action so as to instantly disengage when the subsequent meshing gear becomes loose; and the purpose of increasing the detection frequency of the diesel engine speed is that since the speed of the diesel engine rises rapidly after ignition, the detection frequency needs to be increased to protect the safety of the starter motor.

[0030] In a further embodiment, the method of the present invention further comprises: in response to the second stage transmission disengagement still not being successful when the diesel engine speed is greater than a third preset threshold, controlling the diesel engine to shut down through a protection device.

[0031] Specifically, in this embodiment, the third preset value is configured to be 80% to 90% of the safe speed of the starter motor. At this time, since multiple attempts to disengage have been made without success, it indicates that automatic disengagement is no longer possible, and thus shutdown inspection is required.

[0032] As the methods in the above embodiments, the present invention can effectively reduce the probability of tooth sticking by setting a staged tooth withdrawal operation and control the diesel engine to stop when it is determined that the tooth sticking problem cannot be solved to ensure the safety of the starter motor.

[0033] In the second aspect of the present invention, a diesel engine starting control system is proposed. Figure 2 , including: a controller 10, used to execute the steps of the diesel engine starting control method in any of the above method embodiments; a speed detection device 20, used to detect the speed of the target diesel engine; a distance measuring device 30, used to detect the relative distance between the starter motor gear and the distance measuring device 30 so that the controller 10 executes the first stage transmission disengagement and the second stage transmission disengagement based on the relative distance control, and determines whether the first stage transmission disengagement and the second stage transmission disengagement are successful; wherein the speed detection device 20 and the distance measuring device 30 are respectively communicated with the controller 10.

[0034] Specifically, the distance measuring device 30 is used to detect the relative distance to the starter motor gear in real time and send it to the controller 10, so that the controller 10 obtains the position information of the starter motor gear in real time, and then controls the tooth withdrawal displacement based on the position information of the starter motor gear, thereby controlling the first stage transmission disengagement or the second stage transmission disengagement.

[0035] In one embodiment, the distance measuring device of the present invention includes: an infrared distance measuring device and / or an ultrasonic distance measuring device.

[0036] In one embodiment, the diesel engine starting control system of the present invention further includes: a protection device 40, which is communicatively connected with the controller and is used for controlling the target diesel engine to stop running.

[0037] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order.

[0038] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A diesel engine starting control method, characterized in that: The method comprises: The starter motor drives the diesel engine to start through the transmission mechanism and detects the speed of the diesel engine in real time; In response to the diesel engine speed being greater than a first preset threshold, controlling the transmission mechanism to perform a first stage transmission disengagement between the starter motor and the diesel engine; In response to the diesel engine speed being greater than a second preset threshold, controlling the transmission mechanism to perform a second stage transmission disengagement between the starter motor and the diesel engine; In response to both the first stage transmission disengagement and the second stage transmission disengagement being successful, it is determined that the starter motor disengagement is successful.

2. The diesel engine starting control method according to claim 1, characterized in that: The method further includes: configuring the first preset threshold to be the ignition speed of the diesel engine, and configuring the second preset threshold to be greater than the first preset threshold.

3. The diesel engine starting control method according to claim 2, characterized in that: In response to the diesel engine speed being greater than a first preset threshold, controlling the transmission mechanism to perform a first stage transmission disengagement between the starter motor and the diesel engine, comprising: In response to the diesel engine speed being greater than a first preset threshold, the starter motor gear in the transmission mechanism is controlled to be retracted to a semi-engaged state with the diesel engine gear.

4. The diesel engine starting control method according to claim 3, characterized in that: In response to the diesel engine speed being greater than a second preset threshold, controlling the transmission mechanism to perform a second stage transmission disengagement between the starter motor and the diesel engine, comprising: In response to the diesel engine speed being greater than a second preset threshold, the starter motor gear in the transmission mechanism is controlled to be retracted to a state of being completely disengaged from the diesel engine gear.

5. The diesel engine starting control method according to claim 1, characterized in that: The method further comprises: In response to the first stage transmission disengagement not being successful, the transmission mechanism is directly controlled to perform a second stage transmission disengagement of the starter motor and the diesel engine.

6. The diesel engine starting control method according to claim 1 or 5, characterized in that: The method further comprises: In response to the failure of the second-stage transmission disengagement, the transmission disengagement signal is kept in a high level state, and the detection frequency of the diesel engine speed is increased.

7. The diesel engine start control method according to claim 6, characterized in that: The method further comprises: In response to the second stage transmission disengagement still not being successful when the speed of the diesel engine is greater than a third preset threshold, the diesel engine is controlled to stop by a protection device.

8. A diesel engine starting control system, characterized in that: include: A controller, used to execute the steps of the diesel engine starting control method according to any one of claims 1 to 7; A rotation speed detection device, used for detecting the rotation speed of a target diesel engine; a distance measuring device, used for detecting the relative distance between the starter motor gear and the distance measuring device so that the controller controls the execution of the first stage transmission disengagement and the second stage transmission disengagement based on the relative distance, and determines whether the first stage transmission disengagement and the second stage transmission disengagement are successful; Wherein, the rotation speed detection device and the distance measurement device are respectively connected to the controller for communication.

9. The diesel engine starting control system according to claim 8, characterized in that: The distance measuring device comprises: Infrared distance measuring device and / or ultrasonic distance measuring device.

10. The diesel engine starting control system according to claim 8, characterized in that: Also includes: A protection device is communicatively connected with the controller and is used for controlling the diesel engine to stop running.

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