CN112160840B - Engine control method and device and engineering mechanical vehicle - Google Patents

Abstract

The embodiment of the invention discloses an engine control method and device and an engineering mechanical vehicle. The method comprises the following steps: receiving a sudden load identification result sent by the vehicle controller; if the engineering mechanical vehicle meets the sudden loading working condition, judging whether the speed dropping speed of the engine is greater than the preset speed dropping speed or not according to the rotating speed value of the engine; and if the speed dropping speed of the engine is greater than the preset speed dropping speed, controlling the running speed of the engineering machinery vehicle to be reduced so as to maintain or recover the rotating speed value of the engine within the large torque point interval. The technical scheme provided by the embodiment of the invention can control the engine to work in a low oil consumption area, and can timely adjust the running speed under the condition of suddenly increasing load, thereby avoiding flameout.

Description

An engine control method, device and construction machinery vehicle

technical field

Embodiments of the present invention relate to the technical field of engine control, and in particular, to an engine control method, device, and construction machinery vehicle.

Background technique

Engines installed in construction machinery vehicles (eg, loaders, bulldozers, road rollers, motor graders, excavators, etc.) are usually high-speed engines. In the prior art, considering that the construction machinery vehicle has a high probability of encountering sudden load conditions, the engine is generally controlled to work near the rated speed to ensure a high torque reserve and avoid sudden load during operation. When the speed drops too much under the working condition, it affects the efficiency or even the flameout.

However, the low fuel consumption area of the engine generally corresponds to the high torque point range, and the rated speed is not within the high torque point range, which causes the engine to deviate from the low fuel consumption area of the engine when working near the rated speed, which is not conducive to energy saving and consumption reduction.

SUMMARY OF THE INVENTION

The invention provides an engine control method, a device and a construction machinery vehicle, so as to control the engine to work in a low fuel consumption area and avoid flameout when encountering a sudden load.

In a first aspect, an embodiment of the present invention provides an engine control method, the method comprising:

Receive the sudden load identification result sent by the vehicle controller;

If the construction machinery vehicle encounters a sudden load condition, determine whether the speed of the engine is greater than the preset speed according to the rotational speed of the engine;

If the deceleration speed of the engine is greater than the preset deceleration speed, control the operating speed of the construction machinery vehicle to decrease, so that the rotational speed value of the engine is maintained or returned to the high torque point range;

Wherein, the high torque point interval includes a first rotational speed boundary value and a second rotational speed boundary value, and the first rotational speed boundary value is smaller than the second rotational speed boundary value.

In a second aspect, an embodiment of the present invention further provides an engine control device, the device comprising:

The sudden load identification result receiving module is used to receive the sudden load identification result sent by the vehicle controller;

A deceleration speed judgment module, configured to judge whether the deceleration speed of the engine is greater than a preset deceleration speed according to the rotational speed value of the engine when the construction machinery vehicle encounters a sudden load condition;

A rotational speed value maintenance module, used to control the operating speed of the construction machinery vehicle to decrease when the speed of the engine is greater than the preset speed of loss, so that the rotational speed value of the engine is maintained or returned to a high torque within the point interval;

Wherein, the high torque point interval includes a first rotational speed boundary value and a second rotational speed boundary value, and the first rotational speed boundary value is smaller than the second rotational speed boundary value.

In a third aspect, an embodiment of the present invention further provides a vehicle, comprising: an engine, a vehicle controller, and an engine controller, wherein the engine and the vehicle controller are both electrically connected to the engine controller;

The engine controller includes a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, implements the method of the first aspect.

The engine control method provided by the embodiment of the present invention controls the engine to work within the high torque point range, and adjusts the engine speed value in a timely manner when the entire construction machinery vehicle encounters a sudden load and causes the speed value of the engine to drop rapidly. operating speed, so as to avoid the speed value dropping too much or stalling. The invention solves the problem that the engine in the prior art deviates from the low fuel consumption area due to working near the rated speed, realizes the effect of shifting the speed value of the engine to the high torque point range, reduces fuel consumption, and avoids the problem of flameout caused by sudden load.

Description of drawings

1 is a schematic flowchart of an engine control method according to Embodiment 1 of the present invention;

2 is a schematic flowchart of an engine control method according to Embodiment 2 of the present invention;

3 is a schematic flowchart of a S240 provided in Embodiment 2 of the present invention;

4 is a schematic flowchart of another S240 provided in Embodiment 2 of the present invention;

5 is a schematic structural diagram of an engine control device provided in Embodiment 3 of the present invention;

6 is a schematic structural diagram of a vehicle according to Embodiment 4 of the present invention;

FIG. 7 is a flowchart of a method for an engine controller to control an engine according to Embodiment 4 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

Before discussing the exemplary embodiments in greater detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts various operations (or steps) as a sequential process, many of the operations may be performed in parallel, concurrently, or concurrently. Additionally, the order of operations can be rearranged. The process may be terminated when its operation is complete, but may also have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, subroutines, and the like. Furthermore, the embodiments of the invention and the features of the embodiments may be combined with each other without conflict.

Example 1

FIG. 1 is a schematic flowchart of an engine control method provided in Embodiment 1 of the present invention. The method can be applied to the situation of controlling the engine, and the method can control the engine when the construction machinery vehicle does not encounter a sudden load condition. Work in the high torque point range; when the construction machinery vehicle encounters a sudden load condition and the speed value of the engine drops rapidly, reduce the running speed of the construction machinery vehicle in time to keep the engine speed value at or Returning to the high torque point range, preventing the engine from stalling, and solving the problem that the engine in the prior art deviates from the low fuel consumption area due to working near the rated speed. The method can be performed by an engine control device, which can be implemented by software and/or hardware, and is generally integrated on a terminal, which can be an intelligent terminal with processing functions, such as a trip computer, an on-board computer, and the like.

Referring to Figure 1, the engine control method specifically includes the following steps:

S110. Receive a sudden load identification result sent by the vehicle controller.

Specifically, the construction machinery vehicle includes a vehicle controller and an engine control device. After the vehicle controller identifies the sudden load, it sends the sudden load identification result to the engine control device. Among them, the identification results of sudden load include two conditions: the construction machinery vehicle does not encounter the sudden load condition and the construction machinery vehicle encounters the sudden load condition. Exemplarily, when the soil carried in the body of a bulldozer (one type of construction machinery vehicle) suddenly increases, the construction machinery vehicle encounters a sudden load condition.

Optionally, S110 specifically includes: receiving the working mode of the construction machinery vehicle sent by the vehicle controller; and receiving a sudden load identification result sent by the vehicle controller when the construction machinery vehicle is in the working mode.

Specifically, the working modes of the construction machinery vehicle include an operation mode and a non-operation mode. When the construction machinery vehicle is in the non-operation mode, for example, when the excavator is not excavating, the sudden load condition will not occur. , the vehicle controller does not need to perform sudden load identification, which can reduce the occupation of vehicle controller resources. When the construction machinery vehicle is in operation mode, when the excavator performs the digging action, sudden load conditions will frequently occur. During working conditions, the engine control device can adjust in time to maintain or restore the engine speed value to the high torque range to avoid stalling.

S120 , if the construction machinery vehicle encounters a sudden load condition, determine whether the engine's deceleration speed is greater than the preset deceleration speed according to the rotational speed value of the engine.

Specifically, before the construction machinery vehicle encounters a sudden load condition, the torque output by the engine and the demand for torque from the load of the construction machinery vehicle are in a state of balance, and the engine works within the high torque point range (will be discussed later on). Large torque point interval for explanation). At this time, if the construction machinery vehicle encounters a sudden load condition, the torque output by the engine will no longer meet the torque requirement of the increased load. The speed of the engine will drop suddenly when it encounters a sudden load condition. When the speed of the engine drops too fast, there may be a problem that the speed of the engine will drop too much and cause a flameout. In the case of sudden load conditions, it is necessary to judge in time whether the engine speed value drops too fast. When the deceleration speed is greater than the preset deceleration speed, it indicates that the speed of the engine decreases rapidly, which may cause flameout; when the deceleration speed is less than or equal to the preset deceleration speed, it indicates that the deceleration of the engine speed is slow, and it is not easy to There is less risk of causing a flameout or causing a flameout.

Specifically, the specific value of the preset deceleration speed can be set by those skilled in the art according to the performance of the engine itself and the construction machinery vehicle itself, which is not limited here. The specific implementation form of judging whether the deceleration speed of the engine is greater than the preset deceleration speed can be set by those skilled in the art according to the actual situation, which is not limited here.

Optionally, S120 specifically includes: if the construction machinery vehicle encounters a sudden load condition, determine the first time required for the engine speed value to drop to the preset speed drop value according to the engine speed value; if the first time is less than the preset speed value. Set the time to make sure that the engine's deceleration speed is greater than the preset deceleration speed. Specifically, the preset drop speed value and the specific value of the first time can be set by those skilled in the art according to the performance of the engine itself and the construction machinery vehicle itself, which are not limited here. Exemplarily, the preset drop speed value may be in the range of 30-100rpm, and the first time may be in the range of 2s-5s. Specifically, when the first time is less than the preset time, it indicates that the rotational speed value of the engine drops rapidly, and the risk of flameout is high; when the first time is greater than or equal to the preset time, it is determined that the speed of the engine is less than or equal to the preset speed The speed of falling speed indicates that the speed value of the engine drops slowly, and it is not easy to cause flameout or the risk of flameout is small.

S130. If the speed of the engine is greater than the preset speed of speed, control the operating speed of the construction machinery vehicle to decrease, so that the rotational speed value of the engine is maintained or returned to the high torque point range.

Specifically, the operating speed refers to the operating speed of the construction machinery vehicle. Exemplarily, for a shovel, the operating speed refers to the speed at which the bucket of the shovel operates. For bulldozers and loaders, the operating speed Speed refers to vehicle speed. It can be understood that the operating speed of the construction machinery vehicle is a part of the load of the construction machinery vehicle. When the construction machinery vehicle operation encounters a sudden load condition, the reduction of the engine speed value can be slowed down by reducing the operation speed of the construction machinery vehicle. speed, so as to avoid the problem that the engine speed value drops too much and causes the problem of flameout.

Specifically, the specific implementation manner of controlling the reduction of the running speed of the construction machinery vehicle can be set by those skilled in the art according to the actual situation, which is not limited here.

Optionally, the method may further include:

S140. If the construction machinery vehicle does not encounter a sudden load condition, control the engine to maintain the current rotational speed value, wherein the current rotational speed value of the engine is within the high torque point range.

The high torque point interval includes a first rotational speed boundary value and a second rotational speed boundary value, and the first rotational speed boundary value is greater than the second rotational speed boundary value. The high torque point range of the engine is a performance parameter of the engine, which is related to the model of the engine. The high torque point range can be determined by the relationship between the speed and fuel consumption. When the engine speed value is in the high torque point range, the engine is in low fuel consumption. Area.

It can be understood that when the construction machinery vehicle does not encounter a sudden load condition, the load of the construction machinery vehicle does not change the torque demand. Controlling the engine to maintain the current speed value can make the torque output by the engine meet the load's torque demand. In this way, the construction machinery vehicle can continue to work in the high torque point range, that is, in the low fuel consumption area, which can save fuel consumption.

The engine control method provided by the embodiment of the present invention controls the engine to work within the high torque point range, and adjusts the engine speed value in a timely manner when the entire construction machinery vehicle encounters a sudden load and causes the speed value of the engine to drop rapidly. operating speed, so as to avoid the speed value dropping too much or stalling. The invention solves the problem that the engine in the prior art deviates from the low fuel consumption area due to working near the rated speed, realizes the effect of shifting the speed value of the engine to the high torque point range, reduces fuel consumption, and avoids the problem of flameout caused by sudden load.

Embodiment 2

FIG. 2 is a schematic flowchart of an engine control method according to Embodiment 2 of the present invention. This embodiment is optimized on the basis of the above-mentioned embodiment. Specifically, referring to Figure 2, the method specifically includes the following steps:

S210. Receive a sudden load identification result sent by the vehicle controller.

S220 , if the construction machinery vehicle encounters a sudden load condition, determine whether the engine's deceleration speed is greater than the preset deceleration speed according to the rotational speed value of the engine.

S230, if the speed of the engine is less than or equal to the preset speed of speed, control the running speed of the construction machinery vehicle to remain unchanged.

Specifically, the magnitude of the sudden load is an important factor that affects the speed of the engine speed drop. When the engine's speed is less than or equal to the preset speed, it indicates that the sudden load is small. When the speed is greater than the preset drop speed, it indicates that the sudden load is large.

It can be understood that the external characteristic curve of the speed-reserved torque value is a characteristic parameter of the engine. When the speed of the engine is a certain value, according to the external characteristic curve of the speed-reserved torque value, it can be known that the engine operates at a certain speed. The reserve torque value is the maximum torque value that the engine can output at this speed value, and the actual torque output by the engine at this speed value is related to the load of the construction machinery vehicle, and is less than or equal to the reserve torque value. When the sudden load is small, the speed value of the engine decreases less. If the reserve torque value corresponding to the reduced speed value is greater than or equal to the torque demand of the load after the sudden load, the torque output from the engine and the load can be achieved again. The torque demand is in a balanced state without reducing the operating speed. By reasonably setting the preset speed drop speed, the speed value of the engine can change less when the sudden load is small, and it is still within the range of the high torque point, and the torque output by the engine at the changed speed value can meet the requirements of the sudden load. the torque demand of the load.

S240, if the speed of the engine is greater than the preset speed of speed, control the operating speed of the construction machinery vehicle to decrease, so that the rotational speed value of the engine is maintained or returned to the high torque point range.

Specifically, there are various specific implementation manners for controlling the reduction of the operating speed of the construction machinery vehicle, and typical examples are described below, which are not enough to limit the present application.

FIG. 3 is a schematic flowchart of S240 according to Embodiment 2 of the present invention. Referring to Fig. 3, optionally, S240 specifically includes:

S241A, if the speed of the engine is greater than the preset speed of speed, control the operating speed of the construction machinery vehicle to decrease by the first preset operating speed drop value.

Specifically, the operating speed of the construction machinery vehicle when it encounters a sudden load condition is V1, and the operating speed of the construction machinery vehicle is controlled to decrease by the first preset operating speed drop value △V1, then the operating speed of the construction machinery vehicle will be reduced to V1 -△V1. Specifically, the specific value of the first preset operating speed drop value ΔV1 can be set by those skilled in the art according to the actual situation, which is not assumed here. For example, when the operating speed of the construction machinery vehicle refers to the vehicle speed, ΔV1 The value can be within 2Km/h-2Km/h.

S242A. Determine whether the current rotational speed value of the engine is less than the first rotational speed boundary value.

Specifically, controlling the operating speed (for example, the vehicle speed) of the construction machinery vehicle to decrease the first preset operating speed decrease value ΔV1 can reduce the decreasing speed of the rotational speed value of the engine. However, when the sudden load is large, the rotational speed value of the engine decreases The drop speed is very fast. Even if the speed of the engine speed value can be reduced by reducing the operating speed, the engine speed value may still drop rapidly, and the engine speed value may exceed the high torque point range. At this time, further measures should be taken to prevent the engine from stalling due to the excessive drop in the speed value.

S243A. If no, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the high torque point range.

Specifically, if the current rotational speed value of the engine is greater than or equal to the first rotational speed boundary value, it indicates that the rotational speed value of the engine is still within the high torque point range, and the operating speed of the construction machinery vehicle is controlled to drop by the first preset operating speed drop value ΔV1 that is already lower than that of the first preset operating speed drop value ΔV1 The speed of decrease of the speed value is greatly alleviated, and there is no need to reduce the running speed again.

S244A. If yes, determine whether the current rotational speed value of the engine is less than the preset minimum rotational speed value; wherein, the preset minimum rotational speed value is smaller than the first rotational speed boundary value.

Specifically, the specific value of the minimum rotational speed value can be set by those skilled in the art according to the actual situation, which is not limited here. Exemplarily, the minimum rotational speed value may be in the range of 1200-1300 rpm.

S245A. If yes, control the operating speed of the construction machinery vehicle to drop by a second preset operating speed drop value, so that the rotational speed value of the engine returns to the high torque point range.

Specifically, if the current rotational speed value of the engine is less than the preset minimum rotational speed value, it indicates that the rotational speed value of the engine has deviated from the high torque point range to a large extent, and the operating speed of the construction machinery vehicle is controlled to decrease by the first preset operating speed decrease value ΔV1. The decreasing speed of the rotational speed value is reduced to a certain extent, but the rotational speed value of the engine is still decreasing rapidly. At this time, the operating speed is decreased by the second preset operating speed decrease value △V2, that is, from V1-△V1 to V1- △V1-△V2 is beneficial to further reduce the falling speed of the rotational speed value. Specifically, the specific value of the second preset operating speed drop value ΔV2 can be set by those skilled in the art according to the actual situation, which is not assumed here. For example, when the operating speed of the construction machinery vehicle refers to the vehicle speed, ΔV2 The value can be within 2Km/h-2Km/h.

S246A. If no, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine returns to the high torque point range.

Specifically, the current rotational speed value of the engine is greater than or equal to the preset minimum rotational speed value, indicating that although the rotational speed value of the engine exceeds the high torque point interval, the degree of deviation from the high torque point interval is small. It can be understood that the engine needs a certain response time in the face of a sudden load. When the current speed value of the engine deviates from the high torque point range to a small extent, it is possible that after a period of response time, the torque value output by the engine meets the sudden increase in load. When the rear load demands torque, the engine speed value can return to the high torque range.

FIG. 4 is a schematic flowchart of another S240 according to Embodiment 2 of the present invention. Referring to Figure 4, optionally, S240 specifically includes:

S241B, if the engine's deceleration speed is greater than the preset deceleration speed, control the operation speed of the construction machinery vehicle to decrease by the first preset operation speed decrease value.

S242B, judging whether the current rotational speed value of the engine is less than the first rotational speed boundary value.

S243B. If no, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the high torque point range.

S244B. If yes, determine the torque demand value of the construction machinery vehicle according to the load of the construction machinery vehicle.

Specifically, the specific implementation manner of determining the torque demand value of the construction machinery vehicle according to the load of the construction machinery vehicle can be set by those skilled in the art according to the actual situation, which is not limited here.

S245B, judging whether the current engine speed value is less than the preset minimum speed value, and determining whether the torque demand value is greater than the reserve torque value corresponding to the current engine speed value; wherein the preset minimum speed value is less than the first speed boundary value.

Specifically, the reserve torque value corresponding to the current speed value of the engine can be determined by looking up the external characteristic curve of the engine speed value-torque reserve value.

S246B, if the current speed value of the engine is less than the preset minimum speed value, control the operating speed of the construction machinery vehicle to drop by a second preset operating speed drop value, so that the speed value of the engine returns to the high torque point range.

S247B, if the torque demand value is greater than the reserve torque value, control the operating speed of the construction machinery vehicle to drop by a second preset operating speed drop value, so that the engine speed value is maintained or returned to the high torque point range.

It can be understood that if the current torque demand value is greater than the reserve torque value corresponding to the current speed value, it indicates that the current load is large, and the operating speed needs to be further reduced to reduce the load, thereby reducing the difference between the torque output by the engine and the demand for torque by the load as soon as possible. The difference between the engine speed and the engine speed value will continue to drop and cause the flameout.

S248B. If the current speed value of the engine is greater than or equal to the preset minimum speed value, and the torque demand value is less than or equal to the reserve torque value, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the speed value of the engine is maintained or returned to within the high torque point range.

It can be understood that if the current speed value of the engine is greater than or equal to the preset minimum speed value, and the torque demand value is less than or equal to the reserve torque value, it indicates that the engine can meet the torque demand of the load at the current speed value, and there is no need to reduce the operating speed. Reduce the load and maintain the operating speed at V-△V1. After a period of response time, the torque value output by the engine can meet the torque demand of the load after a sudden load increase, and the speed value of the engine can return to the high torque range.

It can also be understood that, by setting one of the reserve torque value corresponding to the current speed value of the engine is less than the preset minimum speed value and the torque demand value is greater than the current speed value of the engine, the operating speed of the construction machinery vehicle is controlled to decrease. , which can make the adjustment of the running speed more timely, and further reduce the risk of flameout caused by the drop of the engine speed value too fast.

S250 , controlling the operation speed of the construction machinery vehicle to return to the operation speed before the construction machinery vehicle encounters a sudden load condition.

Specifically, after a period of response time, when the speed value of the engine is stabilized in the high torque range again, the operating speed can be slowly restored to V1. The process of slowly restoring the operating speed is different from the sudden load, and will not cause a rapid drop in the engine speed value, and thus will not cause the stall problem caused by the excessive drop in the engine speed value.

The technical solution provided by the embodiment of the present invention is to control the operating speed of the construction machinery vehicle to decrease by the first preset operating speed drop value when the speed of the engine is greater than the preset speed, so as to alleviate the problem of the rapid decrease of the rotational speed of the engine. trend; when the operating speed is lowered by the first preset operating speed drop value and still the current engine speed value is less than the preset minimum speed value, the operating speed is lowered again to further alleviate the rapid decline of the engine speed value. The speed and the degree of decrease in the speed of the engine speed value can be adjusted in a timely and appropriate manner, which can not only avoid flameout, but also avoid the problem of excessive adjustment of the operating speed.

Embodiment 3

FIG. 5 is a schematic structural diagram of an engine control device provided in Embodiment 3 of the present invention. Referring to FIG. 5 , the device includes: a sudden load identification result receiving module 310 for receiving the sudden load identification result sent by the vehicle controller;

The deceleration speed judgment module 320 is configured to judge whether the deceleration speed of the engine is greater than the preset deceleration speed according to the rotational speed value of the engine when the construction machinery vehicle encounters a sudden load condition;

The rotational speed value maintaining module 330 is used to control the operating speed of the construction machinery vehicle to decrease when the speed of the engine is greater than the preset speed of loss, so that the rotational speed of the engine is maintained or returned to the range of the high torque point; The torque point interval includes a first rotational speed boundary value and a second rotational speed boundary value, and the first rotational speed boundary value is smaller than the second rotational speed boundary value.

On the basis of the above technical solution, optionally, the deceleration speed judgment module 320 is specifically configured to, when the construction machinery vehicle encounters a sudden load condition, determine that the rotational speed value of the engine decreases by a preset deceleration value according to the rotational speed value of the engine If the first time is less than the preset time, it is determined that the deceleration speed of the engine is greater than the preset deceleration speed.

Optionally, the rotational speed value maintaining module 330 is specifically configured to control the operating speed of the construction machinery vehicle to drop by the first preset operating speed drop value when the speed of the engine is greater than the preset speed of speed drop; determine the current rotational speed value of the engine. Whether it is less than the first rotational speed boundary value; if not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the range of the high torque point; if so, determine whether the current rotational speed value of the engine is less than the preset value The minimum rotational speed value; wherein, the preset minimum rotational speed value is less than the first rotational speed boundary value; if so, control the operating speed of the construction machinery vehicle to drop by the second preset operating speed drop value, so that the rotational speed value of the engine returns to the high torque point range ; If not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine returns to the high torque point range.

Optionally, the rotational speed value maintaining module 330 is specifically configured to control the operating speed of the construction machinery vehicle to drop by the first preset operating speed drop value when the speed of the engine is greater than the preset speed of speed drop; determine the current rotational speed value of the engine. Whether it is less than the first rotational speed boundary value; if not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the high torque point range; if so, determine the construction machinery vehicle according to the load of the construction machinery vehicle judging whether the current speed value of the engine is less than the preset minimum speed value, and judging whether the torque demand value is greater than the reserve torque value corresponding to the current speed value of the engine; wherein, the preset minimum speed value is less than the first speed boundary value ; If the current speed value of the engine is less than the preset minimum speed value, the operating speed of the construction machinery vehicle is controlled to drop by the second preset operating speed drop value, so that the speed value of the engine returns to the high torque point range; if the torque demand value is greater than Reserve torque value, control the operating speed of the construction machinery vehicle to drop by the second preset operating speed drop value, so that the engine speed value is maintained or returned to the high torque point range; if the current engine speed value is greater than or equal to the preset minimum speed value, and the torque demand value is less than or equal to the reserve torque value, the operating speed of the construction machinery vehicle is controlled to maintain the current operating speed, so that the engine speed value is maintained or returned to the high torque point range.

Optionally, it also includes: a rotational speed value maintaining module, configured to control the engine to maintain the current rotational speed value when the construction machinery vehicle does not encounter a sudden load condition; wherein, the current rotational speed value of the engine is within the high torque point range.

Optionally, it also includes: a running speed maintaining module, configured to control the running speed of the construction machinery vehicle to remain unchanged when the engine deceleration speed is less than or equal to a preset deceleration speed.

Optionally, it also includes: a running speed recovery module, which controls the running speed of the construction machinery vehicle to return to the running speed before the construction machinery vehicle encounters a sudden load condition.

Optionally, the sudden load identification result receiving module 310 is specifically configured to receive the working mode of the construction machinery vehicle sent by the vehicle controller; when the construction machinery vehicle is in the working mode, receive the sudden load identification sent by the vehicle controller. result.

The engine control device provided in the third embodiment of the present invention can be used to execute the engine control method provided by the above-mentioned embodiment, and has corresponding functions and beneficial effects.

Embodiment 4

FIG. 6 is a schematic structural diagram of a vehicle according to Embodiment 4 of the present invention. 6, the vehicle includes: an engine 410, a vehicle controller 430 and an engine controller 420, the engine 410 and the vehicle controller 430 are both electrically connected to the engine controller 420; the engine controller 420 includes a memory and a processor, wherein The memory stores a computer program, and when the program is executed by the processor, any of the methods described in Embodiment 1 and Embodiment 2 are implemented.

Exemplarily, FIG. 7 is a flowchart of a method for an engine controller to control an engine according to Embodiment 4 of the present invention. Referring to Figure 7, the method includes:

S610, the construction machinery vehicle is in the working mode, and the rotational speed value of the engine is within the range of the high torque point.

S620. Determine whether the construction machinery vehicle encounters a sudden load condition according to the sudden load coincidence identification result sent by the vehicle controller. If yes, go to S630, if not, go to S640.

S630. Determine, according to the rotational speed value of the engine, the first time required for the rotational speed value of the engine to drop by a preset speed drop value.

S640, the whole vehicle maintains the current state and continues to work.

S650. Determine whether the first time is less than a preset time. If yes, go to S660, if not, go to S670.

S660. Control the operating speed of the construction machinery vehicle to decrease by a first preset operating speed decrease value.

S670, controlling the running speed of the construction machinery vehicle to remain unchanged.

S680. Determine whether the current rotational speed value of the engine is less than the first rotational speed boundary value. If yes, go to S690, if not, go to S710.

S690. Determine the torque demand value of the construction machinery vehicle according to the load of the construction machinery vehicle.

S710: Control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the high torque point range.

S720. Determine whether the torque demand value is greater than the reserve torque value corresponding to the current rotational speed value of the engine. If yes, execute S730, if not, execute S740.

S730 , controlling the operating speed of the construction machinery vehicle to drop by a second preset operating speed drop value, so that the rotational speed value of the engine returns to the high torque point range.

S740. Determine whether the current rotational speed value of the engine is less than the preset minimum rotational speed value. If yes, execute S730, if not, execute S750.

S750 , controlling the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine returns to the high torque point range.

S760, control the operation speed of the construction machinery vehicle to return to the operation speed before the construction machinery vehicle encounters a sudden load condition.

The processor in the vehicle provided by the fourth embodiment of the present invention can be used to execute the engine control method provided by the above embodiment, and has corresponding functions and beneficial effects.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (13)

1. an engine control method based on engine speed, is characterized in that, comprises: Receive the sudden load identification result sent by the vehicle controller; If the construction machinery vehicle does not encounter a sudden load condition, control the engine to maintain the current speed value; wherein, the current speed value of the engine is within the high torque point range; If the construction machinery vehicle encounters a sudden load condition, determine whether the speed of the engine is greater than the preset speed according to the rotational speed of the engine; If the deceleration speed of the engine is greater than the preset deceleration speed, controlling the running speed of the construction machinery vehicle to decrease by a first preset running speed decrease value; judging whether the current rotational speed value of the engine is less than the first rotational speed boundary value; If not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the high torque point range; the operating speed refers to the operating speed of the construction machinery vehicle ; If so, determine whether the current rotational speed value of the engine is less than a preset minimum rotational speed value; wherein the preset minimum rotational speed value is less than the first rotational speed boundary value; If so, control the operating speed of the construction machinery vehicle to drop by a second preset operating speed drop value, so that the rotational speed value of the engine returns to the high torque point range; If not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine returns to the high torque point range; Wherein, the high torque point interval is determined by the relationship between rotational speed and fuel consumption. When the rotational speed value of the engine is in the high torque point interval, the engine is in the low fuel consumption area, and the high torque point interval includes the first rotational speed boundary value and the first rotational speed boundary value. Two rotational speed boundary values, the first rotational speed boundary value is smaller than the second rotational speed boundary value. 2 . The engine control method according to claim 1 , wherein, if the construction machinery vehicle encounters a sudden load condition, it is determined whether the speed of the engine is greater than a preset speed according to the rotational speed value of the engine. 3 . The drop speed includes: If the construction machinery vehicle encounters a sudden load condition, determine the first time required for the rotational speed value of the engine to drop to a preset speed drop value according to the rotational speed value of the engine; If the first time is less than a preset time, it is determined that the speed of the engine is greater than the preset speed. 3 . The engine control method according to claim 1 , further comprising: if the deceleration speed of the engine is less than or equal to the preset deceleration speed, controlling the operation speed of the construction machinery vehicle to remain unchanged. 4 . . 4 . The control method according to claim 1 , wherein if the deceleration speed of the engine is greater than the preset deceleration speed, the operating speed of the construction machinery vehicle is controlled to decrease, so that the After the rotational speed value of the engine is maintained or returned to the high torque point interval, the following further includes: The operation speed of the construction machinery vehicle is controlled to return to the operation speed before the construction machinery vehicle encounters a sudden load condition. 5 . The control method according to claim 1 , wherein the receiving a sudden load identification result sent by the vehicle controller comprises: 5 . receiving the working mode of the construction machinery vehicle sent by the vehicle controller; When the construction machinery vehicle is in the working mode, the sudden load identification result sent by the vehicle controller is received. 6. An engine control method based on engine speed and torque, characterized in that, comprising: Receive the sudden load identification result sent by the vehicle controller; If the construction machinery vehicle does not encounter a sudden load condition, control the engine to maintain the current speed value; wherein, the current speed value of the engine is within the high torque point range; If the construction machinery vehicle encounters a sudden load condition, determine whether the speed of the engine is greater than the preset speed according to the rotational speed of the engine; If the deceleration speed of the engine is greater than the preset deceleration speed, controlling the running speed of the construction machinery vehicle to decrease by a first preset running speed decrease value; judging whether the current rotational speed value of the engine is less than the first rotational speed boundary value; If not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the high torque point interval; the operating speed is the operating speed of the construction machinery vehicle ; If so, determine the torque demand value of the construction machinery vehicle according to the load of the construction machinery vehicle; judging whether the current rotational speed value of the engine is less than a preset minimum rotational speed value, and judging whether the torque demand value is greater than a reserve torque value corresponding to the current rotational speed value of the engine; wherein the preset minimum rotational speed value is less than the the first speed limit value; If the current rotational speed value of the engine is less than the preset minimum rotational speed value, the operating speed of the construction machinery vehicle is controlled to drop by a second preset operating speed drop value, so that the rotational speed value of the engine returns to the high torque point range Inside; If the torque demand value is greater than the reserve torque value, the operating speed of the construction machinery vehicle is controlled to decrease by a second preset operating speed decrease value, so that the rotational speed value of the engine is maintained at or returned to the high torque point within the range; If the current speed value of the engine is greater than or equal to the preset minimum speed value, and the torque demand value is less than or equal to the reserve torque value, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that all the rotational speed value of the engine is maintained or returned to the high torque point range; Wherein, the high torque point interval is determined by the relationship between rotational speed and fuel consumption. When the rotational speed value of the engine is in the high torque point interval, the engine is in the low fuel consumption area, and the high torque point interval includes the first rotational speed boundary value and the first rotational speed boundary value. Two rotational speed boundary values, the first rotational speed boundary value is smaller than the second rotational speed boundary value. 7 . The engine control method according to claim 6 , wherein if the construction machinery vehicle encounters a sudden load condition, it is determined whether the speed of the engine is greater than a preset speed according to the rotational speed value of the engine. 8 . The drop speed includes: If the construction machinery vehicle encounters a sudden load condition, determine the first time required for the rotational speed value of the engine to drop to a preset speed drop value according to the rotational speed value of the engine; If the first time is less than a preset time, it is determined that the speed of the engine is greater than the preset speed. 8 . The engine control method according to claim 6 , further comprising: if the deceleration speed of the engine is less than or equal to the preset deceleration speed, controlling the operation speed of the construction machinery vehicle to remain unchanged. 9 . . 9 . The control method according to claim 6 , wherein if the deceleration speed of the engine is greater than the preset deceleration speed, the operating speed of the construction machinery vehicle is controlled to decrease, so that the After the rotational speed value of the engine is maintained or returned to the high torque point interval, the following further includes: The operation speed of the construction machinery vehicle is controlled to return to the operation speed before the construction machinery vehicle encounters a sudden load condition. 10 . The control method according to claim 6 , wherein the receiving a sudden load identification result sent by the vehicle controller comprises: 10 . receiving the working mode of the construction machinery vehicle sent by the vehicle controller; When the construction machinery vehicle is in the working mode, the sudden load identification result sent by the vehicle controller is received. 11. An engine control device based on engine speed, comprising: The sudden load identification result receiving module is used to receive the sudden load identification result sent by the vehicle controller; A deceleration speed judgment module, configured to judge whether the deceleration speed of the engine is greater than a preset deceleration speed according to the rotational speed value of the engine when the construction machinery vehicle encounters a sudden load condition; A rotational speed value maintenance module, used to control the operating speed of the construction machinery vehicle to decrease when the speed of the engine is greater than the preset speed of loss, so that the rotational speed value of the engine is maintained or returned to a high torque within the point interval; The rotational speed value maintenance module is specifically used to control the operating speed of the construction machinery vehicle to drop by a first preset operating speed drop value when the speed of the engine is greater than the preset speed of speed drop; to determine whether the current rotational speed of the engine is less than the first value of the rotational speed. A rotational speed boundary value; if not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the rotational speed value of the engine is maintained within the range of the high torque point; if so, determine whether the current rotational speed value of the engine is less than the preset minimum rotational speed value ; wherein, the preset minimum rotational speed value is less than the first rotational speed boundary value; if so, control the operating speed of the construction machinery vehicle to decrease by the second preset operating speed decrease value, so that the rotational speed value of the engine returns to the high torque point range; if not , control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the speed value of the engine returns to the high torque point range; Wherein, the high torque point interval is determined by the relationship between rotational speed and fuel consumption. When the rotational speed value of the engine is in the high torque point interval, the engine is in the low fuel consumption area, and the high torque point interval includes the first rotational speed boundary value and the first rotational speed boundary value. Two rotational speed boundary values, the first rotational speed boundary value is smaller than the second rotational speed boundary value. 12. An engine control device based on engine speed and torque, comprising: The sudden load identification result receiving module is used to receive the sudden load identification result sent by the vehicle controller; A deceleration speed judgment module, configured to judge whether the deceleration speed of the engine is greater than a preset deceleration speed according to the rotational speed value of the engine when the construction machinery vehicle encounters a sudden load condition; A rotational speed value maintenance module, used to control the operating speed of the construction machinery vehicle to decrease when the speed of the engine is greater than the preset speed of loss, so that the rotational speed value of the engine is maintained or returned to a high torque within the point interval; The rotational speed value maintenance module is specifically used to control the operating speed of the construction machinery vehicle to drop by a first preset operating speed drop value when the speed of the engine is greater than the preset speed of speed drop; to determine whether the current rotational speed of the engine is less than the first value of the rotational speed. A speed boundary value; if not, control the operating speed of the construction machinery vehicle to maintain the current operating speed, so that the engine speed value is maintained within the large torque point range; if so, determine the torque demand of the construction machinery vehicle according to the load of the construction machinery vehicle value; determine whether the current speed value of the engine is less than the preset minimum speed value, and determine whether the torque demand value is greater than the reserve torque value corresponding to the current speed value of the engine; wherein, the preset minimum speed value is less than the first speed boundary value; if the engine If the current rotational speed value is less than the preset minimum rotational speed value, the operating speed of the construction machinery vehicle is controlled to decrease by the second preset operating speed decrease value, so that the rotational speed value of the engine returns to the range of the high torque point; if the torque demand value is greater than the reserve torque value , control the operating speed of the construction machinery vehicle to drop by a second preset operating speed drop value, so that the rotational speed of the engine is maintained or returned to the high torque point range; if the current rotational speed of the engine is greater than or equal to the preset minimum rotational speed value, and When the torque demand value is less than or equal to the reserve torque value, the operation speed of the construction machinery vehicle is controlled to maintain the current operation speed, so that the engine speed value is maintained or returned to the high torque point range; Wherein, the high torque point interval is determined by the relationship between rotational speed and fuel consumption. When the rotational speed value of the engine is in the high torque point interval, the engine is in the low fuel consumption area, and the high torque point interval includes the first rotational speed boundary value and the first rotational speed boundary value. Two rotational speed boundary values, the first rotational speed boundary value is smaller than the second rotational speed boundary value. 13. A construction machinery vehicle, comprising: an engine, a vehicle controller and an engine controller, wherein the engine and the vehicle controller are both electrically connected to the engine controller; The engine controller includes a memory and a processor, wherein the memory stores a computer program which, when executed by the processor, implements the method of any one of claims 1-5 or 6-10.

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