A method and system for controlling the speed of an electronically controlled engine

Abstract

The application discloses a control method and a control system for the rotating speed of an electronically controlled engine. First, it is determined whether there is a set rotating speed input source switching. If there is a set rotating speed input source switching, the current rotating speed and the set rotating speed are obtained. The rotating speed difference (Delta n) between the current rotating speed and the set rotating speed is calculated. Then, it is determined whether the absolute value of the rotating speed difference (Delta n) is greater than a preset threshold value. If the absolute value of the rotating speed difference (Delta n) is not greater than the preset threshold value, a corresponding execution signal is generated. If the absolute value of the rotating speed difference (Delta n) is greater than the preset threshold value, a corresponding maintenance signal is generated. Finally, according to the execution signal, the rotating speed of the engine is adjusted to the set rotating speed. According to the maintenance signal, the engine is controlled to maintain the current rotating speed. It can be seen that the application avoids the risk caused by the sharp change of the rotating speed of the engine when the set rotating speed input source is switched, and improves the reliability of the engine operation.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a method and control system for controlling the speed of an electronically controlled engine. Background Technology

[0002] The starting and operation of an electronically controlled engine is achieved by the electronic controller identifying the difference between the current speed and the set speed, and controlling the injection quantity of the fuel supply system in each cycle according to the PID control method; therefore, accurately identifying the current speed and the set speed is a prerequisite for ensuring that the engine operates according to the control target.

[0003] In practical applications, there are multiple sources for setting the engine speed, such as on-site monitoring devices, remote control, and digital signals. When multiple sources of setting the engine speed coexist, it is necessary to clearly define the priority and conversion logic. For example, the on-site monitoring device sets the engine speed by controlling the acceleration or deceleration of the engine speed through a combination switch; the remote control device sets the engine speed by controlling the analog input speed signal from the control board.

[0004] In the prior art, a utility model with publication number CN216841939U entitled "Electronic Control Engine Monitoring System" sends a trigger signal to a control board via a signal trigger module. The control board then generates a control signal based on the trigger signal and sends it to the electronic control unit (ECU), enabling the ECU to control the engine operation. A combination switch can also generate control signals; if the control board malfunctions, the combination switch can generate a control signal and transmit it to the ECU, allowing the ECU to control the engine operation. However, this utility model only considers the scenario where the control board malfunctions, enabling the combination switch to control engine speed. It does not consider the risk of a sudden change in engine speed due to a large deviation between the combination switch's set speed and the original control board's set speed when switching to the combination switch. Summary of the Invention

[0005] To address the aforementioned shortcomings, the technical problem to be solved by this invention is to provide a method and system for controlling the speed of an electronically controlled engine, thereby avoiding the risk of drastic changes in engine speed when the speed input source is switched, and improving the reliability of engine operation.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A method for controlling the speed of an electronically controlled engine includes the following steps:

[0008] S1. Determine if there is a switch in the set speed input source;

[0009] S2. If there is a setting speed input source switch, obtain the current speed and the set speed;

[0010] S3. Calculate the speed difference Δn between the current speed and the set speed;

[0011] S4. Determine whether the absolute value of the speed difference Δn is greater than the preset threshold value;

[0012] S5. If the absolute value of the speed difference Δn is not greater than the preset threshold, generate the corresponding execution signal;

[0013] If the absolute value of the speed difference Δn is greater than a preset threshold, a corresponding sustaining signal is generated;

[0014] S6. Adjust the engine speed to the set speed according to the execution signal;

[0015] Based on the sustain signal, control the engine to maintain the current speed.

[0016] In a preferred embodiment, step S5 further includes: generating a corresponding alarm signal if the absolute value of the speed difference Δn is greater than a preset threshold value; then step S6 further includes: triggering an alarm based on the alarm signal.

[0017] In a preferred embodiment, step S5 further includes:

[0018] If the absolute value of the speed difference Δn is greater than the preset threshold, determine whether the over-control switch is pressed;

[0019] If pressed, a corresponding execution signal is generated;

[0020] If not pressed, a corresponding sustain signal is generated.

[0021] The preferred embodiment is that S1 specifically comprises:

[0022] S10. Determine if the remote throttle switch is activated;

[0023] S11. If the remote throttle switch is activated, it is determined that there is a switch of the set speed input source;

[0024] S12. If the remote throttle switch does not activate, it is determined that the speed input source has not been set.

[0025] In a preferred embodiment, S11 further includes:

[0026] If the remote throttle switch is activated, a corresponding response signal is generated;

[0027] Based on the response signal, the corresponding response operation is triggered;

[0028] Get the response input;

[0029] Match the response input with the preset response input;

[0030] If the response input is "allow", it is determined that there is a switch of the set speed input source;

[0031] If the response input is "not allowed", it is determined that the speed input source switch has not been set.

[0032] The preferred method is that the current speed is the speed input by remote control when the remote throttle switch is activated, and the set speed is the speed input by the machine-side monitoring instrument;

[0033] Specifically, S2 is:

[0034] If there is a set speed input source switch, when the remote throttle switch action is obtained, the remote control input will be the corresponding target speed, and the target speed is the current speed;

[0035] Obtain the input speed from the local monitoring instrument; the input speed is the set speed.

[0036] The preferred method is that the current speed is the real-time speed of the engine when the remote throttle switch is activated, and the set speed is the target speed corresponding to the remote control input speed;

[0037] Specifically, S2 is:

[0038] If there is a set speed input source switch, the engine's real-time speed is obtained when the remote throttle switch is activated; the real-time speed is the current speed.

[0039] Obtain the target speed corresponding to the remote control input speed. The target speed is the set speed.

[0040] A control system for electronically controlled engine speed includes an electronic control unit, a remote throttle switching switch and a local monitoring device, both electrically connected to the electronic control unit. The remote throttle switching switch is electrically connected to a remote control. The control system also includes components electrically connected to the electronic control unit:

[0041] A switching judgment start unit is used to determine whether there is a switch in the set speed input source. If there is a switch, a start signal is transmitted to the electronic control unit (ECU). The ECU then starts the speed difference calculation unit based on the received start signal. The speed difference calculation unit acquires the current speed and the set speed, calculates the speed difference Δn between the two speeds, and transmits the data signal corresponding to the absolute value of the speed difference Δn to the ECU. The ECU then transmits this data to the switching judgment unit. The switching judgment unit determines whether the absolute value of the speed difference Δn is greater than a preset threshold. If the absolute value of the speed difference Δn is not greater than the preset threshold, an execution signal is generated. If the absolute value of the speed difference Δn is greater than the preset threshold, a maintenance signal is generated, and either the execution signal or the maintenance signal is transmitted to the ECU. The ECU adjusts the engine speed to the set speed based on the execution signal, or controls the engine to maintain the current speed based on the maintenance signal.

[0042] In a preferred embodiment, the control system further includes a bypass switch electrically connected to the electronic control unit. When the electronic control unit detects that the bypass switch has been pressed, it adjusts the engine speed to a set speed.

[0043] In a preferred embodiment, the control system further includes a response switch electrically connected to the electronic control unit, wherein the electronic control unit is used to activate or deactivate the speed difference calculation unit and the switching judgment unit based on the response signal input by the response switch.

[0044] After adopting the above technical solution, the beneficial effects of the present invention are:

[0045] The present invention provides a method and control system for controlling the speed of an electronically controlled engine. The control method includes the following steps: determining whether there is a switch in the input source of the set speed; if there is a switch, acquiring the current speed and the set speed; calculating the speed difference Δn between the current speed and the set speed; determining whether the absolute value of the speed difference Δn is greater than a preset threshold; if the absolute value of the speed difference Δn is not greater than the preset threshold, generating a corresponding execution signal; if the absolute value of the speed difference Δn is greater than the preset threshold, generating a corresponding maintenance signal; adjusting the engine speed to the set speed according to the execution signal; and controlling the engine to maintain the current speed according to the maintenance signal. Therefore, the present invention avoids the risk of drastic changes in engine speed caused by a switch in the input source of the set speed, thus improving the reliability of engine operation. Attached Figure Description

[0046] Figure 1 This is a flowchart illustrating the method for controlling the speed of an electronically controlled engine in this invention.

[0047] Figure 2 This is a schematic diagram of the control system for the electronically controlled engine speed in this invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Example 1:

[0049] like Figure 1 As shown, a method for controlling the speed of an electronically controlled engine is applied to the control system for the speed of the electronically controlled engine described in Embodiment 2.

[0050] This control method includes the following steps:

[0051] Step S1: Determine if there is a switch in the set speed input source;

[0052] In this embodiment, the specific judgment steps are as follows:

[0053] S10. Determine if the remote throttle switch is activated;

[0054] It should be noted that the remote throttle switch switches between remote control and on-site monitoring. Therefore, this invention can determine whether the source of the set speed input has been switched by checking whether the remote throttle switch is activated.

[0055] S11. If the remote throttle switch is activated, it is determined that there is a switch of the set speed input source;

[0056] It should be noted that when the electrical signal input to the remote throttle switch changes from a high level to a low level, or from a low level to a high level, it indicates that the remote throttle switch has been activated, and that the source of the set speed input has been switched.

[0057] S12. If the remote throttle switch does not activate, it is determined that no speed input source has been set.

[0058] It should be noted that if the electrical signal input to the remote throttle switch is always at a high level or a low level, it indicates that the remote throttle switch is not activated, and that the speed input source has not been switched.

[0059] Step S2: If there is a setting speed input source switch, obtain the current speed and the setting speed;

[0060] It is important to note that remote control input is via the control board. This input is an analog voltage or current signal, which the electronic control unit (ECU) then converts into the target speed for remote throttle control based on a pre-defined analog signal-to-speed correspondence. When the remote throttle switch is set to remote signal input, the ECU's target speed is directly derived from the remote control's target speed. When the remote throttle switch is set to the local monitoring unit's input, the local monitoring unit uses a combination switch for the speed signal input. This allows input of acceleration or deceleration buttons to the ECU via different switch settings, but it cannot accurately input the target speed value. In this case, the initial speed displayed on the local monitoring unit originates from the remote control's target speed when the remote throttle switch is set. The target speed displayed on the local monitoring unit is then output via the acceleration / deceleration switches, which is the ECU's target speed at this point.

[0061] There are two scenarios for the current speed and the set speed: the first is that the set speed input is switched from remote control to the machine-side monitoring device, and the second is that the set speed input is switched from the machine-side monitoring device to remote control.

[0062] When the first scenario is selected, the current engine speed is the remote control input speed when the remote throttle switch is activated, and the set speed is the speed input by the local monitoring instrument; then step S2 specifically involves:

[0063] If there is a set speed input source switch, when the remote throttle switch action is obtained, the remote control input will be the corresponding target speed, and the target speed is the current speed;

[0064] Obtain the input speed from the local monitoring instrument; the input speed is the set speed.

[0065] When the second scenario applies, the current engine speed is the real-time engine speed when the remote throttle switch is activated, and the set speed is the target speed corresponding to the remote control input speed; then step S2 specifically involves:

[0066] If there is a set speed input source switch, the engine's real-time speed is obtained when the remote throttle switch is activated; the real-time speed is the current speed.

[0067] Obtain the target speed corresponding to the remote control input speed. The target speed is the set speed.

[0068] Step S3: Calculate the speed difference Δn between the current speed and the set speed;

[0069] Step S4: Determine whether the absolute value of the speed difference Δn is greater than the preset threshold value; this preset threshold value can be set according to different models, and it is also compatible with the slight speed difference caused by the two speed input types.

[0070] Step S5: If the absolute value of the speed difference Δn is not greater than the preset threshold, generate the corresponding execution signal, indicating that the set speed input source can be switched. At this time, the change in engine speed will not bring any risk.

[0071] If the absolute value of the speed difference Δn is greater than the preset threshold, a corresponding sustain signal is generated; in a preferred embodiment, if the absolute value of the speed difference Δn is not greater than the preset threshold, a corresponding alarm signal is generated; this indicates that switching the set speed input source will cause a risk, so a warning is issued, and the setting speed input source switching can be stopped to avoid the risk.

[0072] Step S6: Adjust the engine speed to the set speed according to the execution signal;

[0073] Based on the sustain signal, control the engine to maintain the current speed;

[0074] The alarm is triggered based on the alarm signal; if the threshold is exceeded, the alarm is triggered and the switching is stopped, reminding the operator to avoid the risk of a sudden change in engine speed due to excessive deviation in the speed setting.

[0075] The control method of this invention is mainly aimed at electronically controlled engines with both remote control input and on-site monitoring input for the set speed in existing technologies. It determines whether there is a change in the input source for the set speed by real-time detection of the remote throttle switching switch. Once a change is detected, the speed difference between the current speed and the set speed is obtained, and it is determined whether the speed difference exceeds a preset threshold (i.e., the maximum preset value). If the difference exceeds the preset threshold, it indicates a significant change in engine speed before and after the switch, which may pose a risk. To mitigate this risk, the current engine speed is maintained, and the change in the input source for the set speed is not executed, thereby avoiding the risk and improving the reliability of engine operation. When the speed difference is not greater than the preset threshold, it indicates a normal change in the input source for the set speed, and the switching and setting of the speed can then proceed.

[0076] In some embodiments of the present invention, a bypass switch control step is also provided. When the speed difference exceeds a preset threshold, the bypass switch allows the execution of a set speed during debugging or special circumstances. After completing the corresponding checks, the bypass switch can be used to allow the setting speed when adjusting the engine speed.

[0077] Then step S5 also includes:

[0078] If the absolute value of the speed difference Δn is greater than the preset threshold, determine whether the over-control switch is pressed;

[0079] If pressed, a corresponding execution signal is generated;

[0080] If not pressed, a corresponding sustain signal is generated.

[0081] In some embodiments of the present invention, step S11 further includes the following step:

[0082] If the remote throttle switch is activated, a corresponding response signal is generated;

[0083] Based on the response signal, the corresponding response operation is triggered;

[0084] Get the response input;

[0085] Match the response input with the preset response input;

[0086] If the response input is "allow", it is determined that there is a switch of the set speed input source;

[0087] If the response input is "not allowed", it is determined that the speed input source switch has not been set.

[0088] Through the above, when the present invention detects a change in the input source of a set speed, it prompts the driver to determine whether to make a judgment on the speed difference, i.e., to make a risk prediction, through a response operation such as a response dialog box. If the response input is allowed, the present invention is used for detection; if not, the present invention can be skipped, thereby improving the overall operating speed of the engine.

[0089] In summary, by adopting the electronically controlled engine speed control method of the present invention, the risk of drastic changes in engine speed caused by switching the set speed input source is avoided; a bypass switch is also used to reserve a forced switching method for debugging or special situations; at the same time, an answer switch is used to allow manual selection of whether to enter the speed difference detection mode, thereby improving the efficiency of engine operation. Example 2:

[0090] like Figure 2 As shown, a control system for electronically controlled engine speed, applying the control method for electronically controlled engine speed described in Embodiment 1, includes an electronic control unit, a remote throttle switching switch and a local monitoring device electrically connected to the electronic control unit, the remote throttle switching switch being electrically connected to a remote controller; the control system also includes a switching judgment and start-up unit, a speed difference calculation unit, a switching judgment unit, an alarm unit, an over-control switch and an answer switch, all electrically connected to the electronic control unit, wherein the answer switch can be a button on a touch screen, a dialog box, etc.

[0091] The switching judgment and activation unit is used to determine whether there is a switch in the set speed input source. If there is a switch, it transmits a start signal to the electronic control unit, which then activates the speed difference calculation unit based on the received start signal. The remote throttle switch switches between remote control and on-site monitoring. Therefore, this invention can determine whether the set speed input source has been switched by checking whether the remote throttle switch is activated.

[0092] The speed difference calculation unit is used to acquire the current speed and the set speed, calculate the speed difference Δn between the current speed and the set speed, and transmit the data signal corresponding to the absolute value of the speed difference Δn to the electronic control unit (ECU). The ECU then transmits the data to the switching judgment unit. Specifically, the current speed and the set speed are divided into two cases: the first is that the set speed input is switched from remote control to the local monitoring device; the second is that the set speed input is switched from the local monitoring device to remote control. In the first case, the current speed is the speed input by the remote control when the remote throttle switch is activated, and the set speed is the speed input by the local monitoring device. In the second case, the current speed is the real-time engine speed when the remote throttle switch is activated, and the set speed is the target speed corresponding to the remote control input speed.

[0093] The switching judgment unit determines whether the absolute value of the speed difference Δn is greater than a preset threshold. If the absolute value of the speed difference Δn is not greater than the preset threshold, an execution signal is generated. If the absolute value of the speed difference Δn is greater than the preset threshold, a maintenance signal is generated, and then the execution signal or maintenance signal is transmitted to the electronic control unit. The electronic control unit adjusts the engine speed to the set speed according to the execution signal, or controls the engine to maintain the current speed according to the maintenance signal. The preset threshold can be set according to different engine models, and it is also compatible with the slight speed differences caused by the two speed input types.

[0094] After the electronic control unit detects that the over-control switch has been pressed, it adjusts the engine speed to the set speed.

[0095] The electronic control unit is used to activate or deactivate the speed difference calculation unit and the switching judgment unit based on the response signal input by the response switch.

[0096] like Figure 2As shown, when the electronically controlled engine speed control system of the present invention is working, when the remote throttle switching switch is activated, it is detected by the switching judgment activation unit. After the switching judgment activation unit transmits a start signal to the electronic control unit, the electronic control unit triggers the response switch to remind the driver. When the response input is not allowed, the start signal is ignored. When the response input is allowed, the speed difference calculation unit and the switching judgment unit are activated. The speed difference calculation unit calculates the speed difference based on the current speed and the set speed and transmits the corresponding data signal to the electronic control unit. The electronic control unit transmits the data signal to the switching judgment unit, which compares the speed difference with a preset threshold. When the speed difference is greater than the preset threshold, the electronic control unit triggers the alarm unit to sound an alarm and simultaneously detects the over-control switch. When the over-control switch is not pressed, the engine is controlled to maintain the current speed. If the over-control switch is pressed, the engine speed is forcibly switched and adjusted to the set speed. When the speed difference is not greater than the preset threshold, the switching of the set speed input source is allowed, and the engine speed is adjusted to the set speed.

[0097] As can be seen, this invention avoids the risk of drastic changes in engine speed when the input source of the set speed is switched; it also uses a control switch to reserve a way to force a switch for debugging or special situations; at the same time, it uses an answer switch to allow manual selection of whether to enter the speed difference detection mode, which improves the efficiency of engine operation.

[0098] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications made within the spirit and principles of the present invention, or improvements to the equivalent electronically controlled engine speed control method and control system, should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the speed of an electronically controlled engine, characterized in that, Includes the following steps: S1. Determine if there is a switch in the set speed input source; S2. If there is a setting speed input source switch, obtain the current speed and the set speed; S3. Calculate the speed difference Δn between the current speed and the set speed; S4. Determine whether the absolute value of the speed difference Δn is greater than the preset threshold value; S5. If the absolute value of the speed difference Δn is not greater than the preset threshold, generate the corresponding execution signal; If the absolute value of the speed difference Δn is greater than a preset threshold, a corresponding sustaining signal is generated; S6. Adjust the engine speed to the set speed according to the execution signal; Based on the sustain signal, control the engine to maintain the current speed; The S5 also includes: If the absolute value of the speed difference Δn is greater than the preset threshold, determine whether the over-control switch is pressed; If pressed, a corresponding execution signal is generated; If not pressed, a corresponding sustain signal is generated.

2. The method for controlling the speed of an electronically controlled engine according to claim 1, characterized in that, S5 further includes: if the absolute value of the speed difference Δn is greater than a preset threshold, generating a corresponding alarm signal; S6 further includes: triggering an alarm based on an alarm signal.

3. The method for controlling the speed of an electronically controlled engine according to claim 1, characterized in that, Specifically, S1 is: S10. Determine if the remote throttle switch is activated; S11. If the remote throttle switch is activated, it is determined that there is a switch of the set speed input source; S12. If the remote throttle switch does not activate, it is determined that the speed input source has not been set.

4. The method for controlling the speed of an electronically controlled engine according to claim 3, characterized in that, S11 further includes: If the remote throttle switch is activated, a corresponding response signal is generated; Based on the response signal, the corresponding response operation is triggered; Get the response input; Match the response input with the preset response input; If the response input is "allow", it is determined that there is a switch of the set speed input source; If the response input is "not allowed", it is determined that the speed input source switch has not been set.

5. The method for controlling the speed of an electronically controlled engine according to any one of claims 1 to 4, characterized in that, The current speed is the speed input by remote control when the remote throttle switch is activated, and the set speed is the speed input by the machine-side monitoring instrument; Specifically, S2 is: If there is a set speed input source switch, when the remote throttle switch action is obtained, the remote control input will be the corresponding target speed, and the target speed is the current speed; Obtain the input speed from the local monitoring instrument; the input speed is the set speed.

6. The method for controlling the speed of an electronically controlled engine according to any one of claims 1 to 4, characterized in that, The current speed is the engine's real-time speed when the remote throttle switch is activated, and the set speed is the target speed corresponding to the remote control input speed. Specifically, S2 is: If there is a set speed input source switch, the engine's real-time speed is obtained when the remote throttle switch is activated; the real-time speed is the current speed. Obtain the target speed corresponding to the remote control input speed. The target speed is the set speed.

7. A control system for electronically controlled engine speed, characterized in that, The system includes an electronic control unit, a remote throttle switch and a local monitoring device electrically connected to the electronic control unit, wherein the remote throttle switch is electrically connected to a remote control; the control system also includes components electrically connected to the electronic control unit: A switching judgment start unit is used to determine whether there is a switch of the set speed input source. If there is a switch of the set speed input source, a start signal is transmitted to the electronic control unit. The electronic control unit starts the speed difference calculation unit according to the received start signal. The speed difference calculation unit is used to obtain the current speed and the set speed, calculate the speed difference Δn between the current speed and the set speed, and transmit the data signal corresponding to the absolute value of the speed difference Δn to the electronic control unit, which then transmits it to the switching judgment unit. A switching judgment unit is used to determine whether the absolute value of the speed difference Δn is greater than a preset threshold. If the absolute value of the speed difference Δn is not greater than the preset threshold, an execution signal is generated. If the absolute value of the speed difference Δn is greater than the preset threshold, a maintenance signal is generated, and then the execution signal or maintenance signal is transmitted to the electronic control unit. The electronic control unit is used to adjust the engine speed to a set speed according to the execution signal, or to control the engine to maintain the current speed according to the maintenance signal; The control system also includes a bypass switch electrically connected to the electronic control unit. When the absolute value of the speed difference Δn is greater than a preset threshold, the electronic control unit detects whether the bypass switch is pressed. If pressed, the engine speed is adjusted to the set speed; if not pressed, the engine is controlled to maintain the current speed.

8. The control system according to claim 7, characterized in that, The control system also includes a response switch electrically connected to the electronic control unit. The electronic control unit is used to start or not start the speed difference calculation unit and the switching judgment unit according to the response signal input by the response switch.

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