Engine PTO control method based on altitude

Abstract

The invention relates to an engine PTO control method based on the altitude. The engine PTO control method comprises the following steps that whether a power takeoff is hung or not is judged; the loading part of the automobile crane enters a hoisting working state; the engine enters a PTO working mode; judging whether the current altitude is greater than an altitude judgment threshold value preset manually or not; judging whether a plateau mode switch is started or not; starting a plateau mode, and controlling the rotating speed of the engine to be increased to a preset rotating speed of the plateau mode from low idle speed; the crane mounted on the automobile crane does not work, and the automobile chassis runs; judging whether an economic mode switch is pressed down or not; controlling the vehicle to enter an economic mode; power torque is reduced while accelerator response is controlled to be reduced, so that the vehicle runs at a constant speed; controlling the vehicle to enter a power mode; and controlling full-power operation of the engine. According to the invention, a plateau mode is added, and a dual-condition trigger logic of'altitude and manual switch 'is added, so that the problems of unstable rotating speed and flameout of an engine of equipment under a plateau working condition are solved.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine control technology, and more specifically to an altitude-based engine PTO control method. Background Technology

[0002] Traditional engine control strategies are simplistic and prone to power loss in high-altitude areas. While existing technologies include driving mode switching functions, they lack a mechanism for coordinating altitude signals and manual commands, and the specific execution strategies in high-altitude mode are unclear.

[0003] The shortcomings of existing technology are: Because existing technologies lack a collaborative judgment mechanism between altitude signals and manual commands, and the specific execution strategy in high-altitude mode is unclear, unexpected increases in engine speed and higher fuel consumption can occur due to accidental switch activation or forgetting to reset switches in plains scenarios. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an altitude-based engine PTO control method, which aims to solve the problems of unstable engine speed and engine stalling under high-altitude operating conditions.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows: An altitude-based engine PTO control method includes the following steps: S100. Determine whether a power take-off (PTO) is engaged, and then perform the following operations based on the determination result: If the determination result is that the power take-off unit has been connected, then proceed to step S200.

[0006] If the determination result is that the power take-off is not engaged, then step S700 is executed.

[0007] S200. The upper structure of the truck crane enters the lifting operation state.

[0008] S300. The engine has entered PTO operating mode.

[0009] S400. Determine whether the current altitude is greater than a manually preset altitude threshold, and then perform the following operations based on the determination result: If the judgment result is that the current altitude is greater than the altitude judgment threshold, then step S500 is executed.

[0010] If the judgment result is that the current altitude is not greater than the altitude judgment threshold, then return and execute step S400 again.

[0011] S500. Determine whether the high-altitude mode switch is enabled, and then perform the following operations based on the determination result: If the determination result indicates that the plateau mode switch is enabled, then proceed to step S600.

[0012] If the determination result is that the plateau mode switch is not enabled, return and execute step S400 again.

[0013] S600. Activate high-altitude mode and control the engine speed to increase from low idle speed to the preset speed for high-altitude mode.

[0014] S700. The crane on the truck is not working, but the truck chassis is moving.

[0015] S800. Determine whether the economy mode switch has been pressed, and then perform the following operations based on the determination result: If the determination result is that the economic mode switch has been pressed, then step S900 is executed.

[0016] If the determination result is that the economic mode switch is not pressed, then return and execute step S1000 again.

[0017] S900. Controls the vehicle to enter economy mode; controls the reduction of throttle response and torque to keep the vehicle moving at a constant speed.

[0018] S1000. Controls the vehicle to enter power mode; controls the engine to run at full power.

[0019] Preferably, the plateau mode is a minimum engine speed preset by the vehicle manufacturer to maintain normal engine operation in a plateau region based on the vehicle's performance; the minimum engine speed in the plateau mode is higher than the engine's low idle speed; during lifting operations, when the environmental pressure sensor detects that the vehicle is in a plateau environment, the driver presses the plateau mode switch to control the engine speed to increase to the preset plateau mode speed; if the vehicle is not in a lifting operation state or the environmental pressure sensor detects that the vehicle is not in a plateau environment, then pressing the plateau mode switch by the driver is ineffective.

[0020] Preferably, the low idle speed range of the engine is 600 rpm to 800 rpm.

[0021] Preferably, the preset speed range for the plateau mode is 800 rpm to 1200 rpm.

[0022] Preferably, the current location is determined to be in a plateau environment when the environmental pressure is below 70 kPa.

[0023] Preferably, the altitude determination threshold is 3000m.

[0024] Compared with the prior art, the present invention has the following advantages: Because this invention adds a high-altitude mode and introduces a dual-condition triggering logic of "altitude + manual switch", it solves the problem of unstable engine speed and engine shutdown under high-altitude conditions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the altitude-based engine PTO control process according to a specific embodiment of the present invention. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0027] This invention application claims a method for PTO control of an engine based on altitude, comprising the following steps: S100. Determine whether a power take-off (PTO) is engaged, and then perform the following operations based on the determination result: If the determination result is that the power take-off unit has been connected, then proceed to step S200.

[0028] If the determination result is that the power take-off is not engaged, then proceed to step S700.

[0029] S200. The upper structure of the truck crane enters the lifting operation state.

[0030] S300. The engine has entered PTO operating mode.

[0031] S400. Determine whether the current altitude is greater than a manually preset altitude threshold, and then perform the following operations based on the determination result: If the judgment result is that the current altitude is greater than the altitude judgment threshold, then proceed to step S500.

[0032] If the judgment result is that the current altitude is not greater than the altitude judgment threshold, then return and execute step S400 again.

[0033] S500. Determine whether the high-altitude mode switch is enabled, and then perform the following operations based on the determination result: If the judgment result indicates that the plateau mode switch is enabled, then proceed to step S600.

[0034] If the result indicates that the plateau mode switch is not enabled, return and execute step S400 again.

[0035] S600. Activate high-altitude mode and control the engine speed to increase from low idle speed to the preset speed for high-altitude mode.

[0036] S700. The crane on the truck is not working, but the truck chassis is moving.

[0037] S800. Determine whether the economy mode switch has been pressed, and then perform the following operations based on the determination result: If the determination result is that the economy mode switch has been pressed, then proceed to step S900.

[0038] If the determination result is that the economy mode switch is not pressed, return and execute step S1000 again.

[0039] S900. Controls the vehicle to enter economy mode; controls the reduction of throttle response and torque to keep the vehicle moving at a constant speed.

[0040] S1000. Controls the vehicle to enter power mode; controls the engine to run at full power.

[0041] It should be noted that, depending on different usage needs, such as using the economy mode when driving at a constant speed on highways to reduce throttle response, or even using partial cylinder deactivation technology to save fuel and achieve the goal of fuel economy; using the sport mode on rough roads or roads with large undulations to increase throttle response and improve power to adapt to the need for getting out of trouble in poor road conditions; in high-altitude areas, the engine speed can be increased or other similar technologies can be used as needed to avoid problems such as engine stalling or insufficient power caused by the reduction of torque and power at high altitudes, so as to adapt to the high-altitude environment and use it safely and reliably.

[0042] It should be noted that the plateau mode is a minimum engine speed preset by the vehicle manufacturer to maintain normal engine operation in high-altitude areas based on the vehicle's performance. The minimum engine speed in plateau mode is higher than the engine's low idle speed. During lifting operations, when the environmental pressure sensor detects that the vehicle is in a high-altitude environment, the driver can press the plateau mode switch to control the engine speed to increase to the preset plateau mode speed. If the vehicle is not in a lifting operation or the environmental pressure sensor detects that the vehicle is not in a high-altitude environment, pressing the plateau mode switch will have no effect.

[0043] In this specific embodiment, the engine's low idle speed range is 600rpm~800rpm.

[0044] In this specific embodiment, the preset speed range for the high-altitude mode is 800rpm~1200rpm.

[0045] In this specific embodiment, when the environmental pressure is below 70 kPa, it is determined that the current environment is a plateau.

[0046] In this specific embodiment, the altitude judgment threshold is 3000m. When the atmospheric pressure sensor detects atmospheric pressure at an altitude of 3000m and the driver presses the switch, the ECM automatically increases the engine speed from 750rpm to 850rpm; when the atmospheric pressure sensor detects atmospheric pressure at an altitude of 3000m but the driver does not press the altitude switch, the ECM does not activate and the engine speed remains normal; when the atmospheric pressure sensor does not detect atmospheric pressure at an altitude of 3000m, and the driver presses the switch, the ECM does not activate and the engine speed remains normal. The specific implementation effects of this invention are shown in Table 1: Table 1. Implementation Results of Altitude-Based Engine PTO Control Method (Appendix) In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0047] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0048] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An altitude-based engine PTO control method, characterized in that: Includes the following steps: S100. Determine whether a power take-off (PTO) is engaged, and then perform the following operations based on the determination result: If the determination result is that the power take-off unit has been connected, then proceed to step S200; If the determination result is that the power take-off is not engaged, then proceed to step S700; S200. The upper structure of the truck crane enters the lifting operation state; S300. Engine enters PTO operating mode; S400. Determine whether the current altitude is greater than a manually preset altitude threshold, and then perform the following operations based on the determination result: If the determination result is that the current altitude is greater than the altitude determination threshold, then step S500 is executed; If the judgment result is that the current altitude is not greater than the altitude judgment threshold, then return and execute step S400 again; S500. Determine whether the high-altitude mode switch is enabled, and then perform the following operations based on the determination result: If the determination result is that the plateau mode switch is enabled, then proceed to step S600; If the determination result is that the plateau mode switch is not enabled, return and execute step S400 again; S600. Activate high-altitude mode and control the engine speed to increase from low idle speed to the preset high-altitude mode speed; S700. The crane on the truck crane is not working, but the truck chassis is moving. S800. Determine whether the economy mode switch has been pressed, and then perform the following operations based on the determination result: If the determination result is that the economic mode switch has been pressed, then proceed to step S900; If the determination result is that the economic mode switch is not pressed, then return and execute step S1000 again; S900. Controls the vehicle to enter economy mode; controls the reduction of throttle response and torque to keep the vehicle moving at a constant speed. S1000. Controls the vehicle to enter power mode; controls the engine to run at full power.

2. The altitude-based engine PTO control method according to claim 1, characterized in that: The plateau mode is a minimum engine speed preset by the vehicle manufacturer to maintain normal engine operation in a plateau region based on the vehicle's performance; the minimum engine speed in the plateau mode is higher than the engine's low idle speed. During the lifting operation, when the environmental pressure sensor detects that the current environment is high altitude, the driver presses the high altitude mode switch to control the engine speed to increase to the preset speed of the high altitude mode. If the vehicle is not in a lifting operation state or the environmental pressure sensor detects that it is not currently in a high-altitude environment, the driver's press of the high-altitude mode switch will be ineffective.

3. The altitude-based engine PTO control method according to claim 2, characterized in that: The engine's low idle speed range is 600rpm~800rpm.

4. The altitude-based engine PTO control method according to claim 3, characterized in that: The preset speed range for the plateau mode is 800 rpm to 1200 rpm.

5. The altitude-based engine PTO control method according to claim 4, characterized in that: When the environmental pressure is below 70 kPa, it is determined that the current environment is a plateau.

6. The altitude-based engine PTO control method according to claim 5, characterized in that: The altitude threshold is 3000m.

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