Method and device for correcting characteristic curve of mining engine

Abstract

The invention relates to a mining engine characteristic curve correction method and device, and the method comprises the steps: obtaining the load information of a vehicle and the slope information of a current road when the vehicle is in an intelligent gear control mode; when the vehicle is in the loading state and the gradient information X is smaller than or equal to the limit value n1, speed regulation is executed according to a third speed regulation section in the characteristic curve; if the gradient information X is greater than the limit value n1 and less than or equal to the limit value n2, executing speed regulation according to a second speed regulation section in the characteristic curve; the gradient information X is greater than the limit n2 and less than or equal to the limit n3; and executing speed regulation according to a first speed regulation section in the characteristic curve. In combination with multiple groups of speed regulation sections, the speed regulation sections of the engine are automatically regulated through load and slope recognition, and the oil consumption is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of engine control, in particular to a method and a device for correcting a characteristic curve of a mining engine. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In order to ensure power, the engine on a mining truck usually has only one characteristic curve. In order to meet the power requirements of mining operations, this characteristic curve usually calibrates the corresponding output torque and output power changes of the engine at different speeds when the throttle is opened at maximum. The mining truck will output different torques and powers according to this characteristic curve to meet operational requirements, and the driver will consider operational requirements and power during operation and will also operate at full throttle.

[0004] Although this method ensures power, it will result in high fuel consumption and is only suitable for mining operations. In non-operating scenarios, the throttle opening does not need to be maximum. For example, when driving on a flat road, the vehicle speed is often adjusted by changing the throttle opening. The existing characteristic curve is calibrated under the condition of maximum throttle opening. Although changing the throttle opening under this curve can adjust the vehicle speed, it cannot release the engine's capacity, resulting in excessive fuel consumption. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a method and device for correcting the characteristic curve of a mining engine. For a mining engine, multiple groups of speed regulating sections are set on the existing characteristic curve to increase the power and torque from the large torque to the rated point, thereby ensuring the low-speed capability. On the other hand, by combining multiple groups of speed regulating sections, through load and slope recognition, the engine speed regulating section is automatically adjusted to further reduce fuel consumption.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a method for correcting a characteristic curve of a mining engine, comprising the following steps:

[0008] When the vehicle is in the intelligent gear control mode, obtain the vehicle's load information and the current road slope information;

[0009] When the vehicle is in a loaded state and the slope information X≤limit value n1, the speed regulation is performed according to the third speed regulation section in the characteristic curve;

[0010] When the vehicle is in a loaded state and the limit value n1 < the slope information X ≤ the limit value n2, the speed regulation is performed according to the second speed regulation section in the characteristic curve;

[0011] When the vehicle is in a loaded state and the limit value n2 < the slope information X ≤ the limit value n3; the speed is adjusted according to the first speed adjustment section in the characteristic curve;

[0012] Among them, the characteristic curve includes at least 4 groups of speed regulation sections. The first speed regulation section is the torque curve corresponding to different speeds when the engine throttle opening is maximum, and the first speed regulation section has the highest target adaptive speed; in the first to fourth speed regulation sections, the target adaptive speed decreases step by step, the engine's carrying capacity decreases step by step, and the fuel consumption increases step by step.

[0013] Furthermore, when the vehicle is in an unloaded state and the slope information X>0, the speed regulation is performed according to the third speed regulation section in the characteristic curve.

[0014] Furthermore, when the vehicle is in an unloaded state and the slope information X≤0, the speed regulation is performed according to the 4th speed regulation section in the characteristic curve.

[0015] Furthermore, when the vehicle is in a loaded state and the slope information X ≤ the limit value n2, it is in a flat road or low slope condition; when the limit value n2 < the slope information X ≤ the limit value n3, it is in a high slope condition.

[0016] Furthermore, when the vehicle is in an unloaded state and the slope information X≤0, it is in a flat road and downhill condition, and when the slope information X>0, it is in an uphill condition.

[0017] Furthermore, when the vehicle is an unmanned vehicle, the gear is automatically matched according to the corresponding speed regulation section and the current vehicle speed.

[0018] Furthermore, when the vehicle is a manned vehicle, if it is on a flat road or a low slope, select a high gear and cooperate with the engine to reduce the speed to ensure vehicle speed and reduce fuel consumption; if it is on a steep slope or uphill condition, select a low gear and cooperate with the engine to reduce the speed to ensure climbing ability.

[0019] Furthermore, when the vehicle is not in the intelligent gear control mode, the monitoring of the engine status is stopped.

[0020] A second aspect of the present invention provides a device for correcting a characteristic curve of a mining engine, comprising:

[0021] The data acquisition module is configured to: when the vehicle is in the intelligent gear control mode, obtain the vehicle's load information and the current road slope information;

[0022] The control module is configured to: when the vehicle is in a loaded state and the slope information X ≤ the limit value n1, perform speed regulation according to the third speed regulation section in the characteristic curve;

[0023] The control module is further configured to: when the vehicle is in a loaded state and the limit value n1 < the slope information X ≤ the limit value n2, perform speed regulation according to the second speed regulation section in the characteristic curve;

[0024] The control module is further configured to: when the vehicle is in a loaded state and the limit value n2 < the slope information X ≤ the limit value n3; perform speed regulation according to the first speed regulation section in the characteristic curve.

[0025] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0026] Multiple speed regulating sections are set on the existing characteristic curve of the mining engine to increase the power and torque from the large torque to the rated point, thereby ensuring low-speed capability and meeting the operation requirements of mining trucks in non-operating scenarios. On the other hand, combined with the setting of multiple speed regulating sections, the engine speed regulating section is automatically adjusted through load and slope recognition, thereby giving full play to the engine's fuel-saving ability and further reducing fuel consumption. Mining trucks are generally based on large-displacement engines. The multiple speed regulating sections set can ensure low-speed carrying capacity by increasing the large torque and power at the intermediate speed, giving full play to the engine's fuel-saving ability and reducing fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 is a schematic diagram of a correction process of a characteristic curve of a mining engine provided by one or more embodiments of the present invention;

[0029] Figure 2 It is a schematic diagram of characteristic curves provided by one or more embodiments of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] The characteristic curve (external characteristic curve) is also called "performance curve", "power characteristic curve", etc. in some materials. It refers to the changes in the output torque and output power of the engine at different speeds when the throttle opening is maximum. Some external characteristic curves will also include the fuel consumption rate curve, and the lowest point of the fuel consumption rate curve is generally near or within the maximum torque speed, so the engine maximum torque speed (range) is also called the "economic speed (range)". Under this condition, the engine output torque is the largest and the fuel consumption is the lowest.

[0033] As introduced in the background technology, the engine on the mining truck will give priority to power in order to meet the needs of mining operations. Therefore, there is only one characteristic curve, and this characteristic curve gives priority to torque. Correspondingly, the driver will also consider the operation needs and power when operating, so as to operate at full throttle. Although this method ensures power, it will lead to high fuel consumption and is only suitable for mining operations. When driving on flat roads, the engine is not working and therefore does not have a high load. The existing characteristic curve is set when the throttle opening is maximum. The flat road obviously does not require the maximum throttle opening. Controlling the vehicle speed through the existing characteristic curve will not release the engine's capacity.

[0034] For the engine characteristics of mining trucks, there is generally only one characteristic curve, namely the curve of "high speed, higher load-bearing capacity, higher fuel consumption", but lacks the curve of "intermediate speed. Lower load-bearing capacity, lower fuel consumption". On flat roads, the demand for the load-bearing capacity of mining trucks is low, and there is no need to execute the "high fuel consumption" characteristic curve. If the engine can be operated at the "intermediate speed" characteristic curve by selecting the appropriate gear while keeping the vehicle speed unchanged, fuel consumption can be reduced. Here, it refers to releasing the engine's ability to reduce fuel consumption.

[0035] Therefore, this embodiment provides a method and device for correcting the characteristic curve of a mining engine. According to the characteristics of the mining engine, the existing characteristic curve is divided into multiple sections, and the speed regulation section and gear are matched and selected according to the current slope and load of the engine.

[0036] Embodiment 1:

[0037] like Figure 1 As shown, the method for correcting the characteristic curve of a mining engine comprises the following steps:

[0038] The whole machine is running;

[0039] The driver chooses whether to enter the intelligent gear control mode; if so, it identifies whether the vehicle is in a loaded state; if not, it exits the intelligent gear control mode, stops monitoring and is handed over to the driver for control.

[0040] When the vehicle is in a loaded state, the current slope information X is identified and the slope is identified according to the pre-calibrated data, specifically:

[0041] X≤n1 (including the case of downslope<0), execute the third speed regulation stage;

[0042] n1<X≤n2, execute the second speed regulation stage;

[0043] n2<X≤n3; execute the first speed regulation section.

[0044] In this embodiment, n1, n2 and n3 are slope thresholds determined in advance through simulation or experiment.

[0045] In this embodiment, the load status can be obtained through sensors. For example, for a truck with leaf spring suspension, a height sensor is installed next to the leaf spring to detect the deformation of the leaf spring after being compressed, and the load status is determined after conversion.

[0046] In this embodiment, the slope information can be obtained by a sensor, for example, by using an altitude sensor (laser rangefinder, radar, etc.) mounted on the vehicle to obtain the height difference of the ground and perform slope calculation. Alternatively, the vehicle's horizontal displacement and vertical displacement (i.e., altitude change) can be obtained by using the vehicle's onboard GPS, and the acceleration information of the vehicle can be obtained by combining the acceleration sensor to obtain the slope value through calculation.

[0047] If the engine is installed in an unmanned vehicle, the gear will be automatically matched to match the low engine speed to ensure vehicle speed and reduce fuel consumption.

[0048] If the engine is installed in a manned vehicle, when X≤n2, it is on a flat road or low slope condition, and a high gear is manually selected to cooperate with the engine to reduce the speed to ensure vehicle speed and reduce fuel consumption; when n2<X≤n3, it is on a large slope condition, and a low gear is manually selected to cooperate with the high engine speed to ensure climbing ability.

[0049] The high gear and low gear in this embodiment are a set of relatively conceptual setting values, which depend on different vehicle models and vehicle speeds. For example, when in a large slope condition, the gear is switched to a relatively lower gear according to the current vehicle speed, so as to obtain a higher torque output through a more matched transmission gear ratio.

[0050] Continuous monitoring: If the driver chooses not to exit the intelligent gear control mode, the vehicle will continue to operate in this mode and monitor the engine status.

[0051] When the vehicle is in an unloaded state, that is, determined to be in an empty state, the current slope information X is identified, and the slope working condition is identified according to the pre-calibrated data, specifically:

[0052] 0<X, it is uphill working condition, execute the third speed regulation stage;

[0053] X≤0, for flat road and downhill conditions, execute the 4th speed regulation stage.

[0054] If the engine is installed in an unmanned vehicle, the gear will be automatically matched according to the slope conditions, and the engine will be rotated at a low speed to ensure vehicle speed and reduce fuel consumption.

[0055] If the engine is installed in a manned vehicle, select a high gear on flat roads and downhill conditions (X≤0) to reduce the engine speed to ensure vehicle speed and reduce fuel consumption; select a low gear on uphill conditions (0<X) to ensure climbing ability with a certain engine speed.

[0056] Continuous monitoring: If the driver chooses not to exit the intelligent gear control mode, the vehicle will continue to operate in this mode and monitor the engine status. When the driver chooses to exit the intelligent gear control mode, the engine status will no longer be monitored (monitoring stops) and the vehicle will be controlled by the driver.

[0057] The specific division of speed regulation section is as follows Figure 2 As shown, Figure 2 The horizontal axis is the engine speed, and the vertical axis is the engine torque.

[0058] The first speed regulation section is the existing characteristic curve of the mining engine, that is, the torque corresponding to different speeds when the throttle opening is maximum.

[0059] The 4 speed regulation curves are divided according to the target adaptive speed, the load-bearing capacity is divided according to 1st>2nd>3rd>4th, and the fuel consumption is divided according to 1st<2nd<3rd<4th.

[0060] Generally, when fully loaded, select the first speed regulation stage for climbing a large slope, select the second speed regulation stage for climbing a small slope, and select the third speed regulation stage for flat roads and downhills. When unloaded, select the third speed regulation stage for climbing, and select the fourth speed regulation stage for downhill flat roads.

[0061] The specific slope division is calibrated according to the working conditions of the mining area and the engine capacity, and this embodiment does not impose any specific restrictions.

[0062] The specific target adaptive speed division needs to be calibrated according to the working conditions of the mining area. The target adaptive speed refers to the engine speed range under the condition of meeting specific performance requirements (such as maximum power, maximum torque, minimum fuel consumption rate, etc.). In this embodiment, the target adaptive speeds of the four speed regulation curves are gradually reduced from the 1st to the 4th speed regulation sections, among which the 1st speed regulation has the highest target adaptive speed, for example, the maximum adaptation is 2200rpm, and the target adaptive speed differences between the 1st to the 4th speed regulation sections are all 100rpm.

[0063] This application is aimed at mining engines, and multiple groups of speed regulating sections are set on the existing characteristic curve to increase the power and torque from large torque to the rated point, thereby ensuring low-speed capability. On the other hand, combined with multiple groups of speed regulating sections, through load and slope recognition, the engine speed regulating section is automatically adjusted to further reduce fuel consumption. Mining trucks are generally based on large-displacement engines. The multiple groups of speed regulating sections set can ensure low-speed load-bearing capacity and give full play to the engine's fuel-saving ability by increasing the large torque and power at the intermediate speed.

[0064] Embodiment 2:

[0065] The correction device of the characteristic curve of a mining engine comprises:

[0066] The data acquisition module is configured to: when the vehicle is in the intelligent gear control mode, obtain the vehicle's load information and the current road slope information;

[0067] The control module is configured to: when the vehicle is in a loaded state and the slope information X ≤ the limit value n1, perform speed regulation according to the third speed regulation section in the characteristic curve;

[0068] The control module is further configured to: when the vehicle is in a loaded state and the limit value n1 < the slope information X ≤ the limit value n2, perform speed regulation according to the second speed regulation section in the characteristic curve;

[0069] The control module is further configured to: when the vehicle is in a loaded state and the limit value n2 < the slope information X ≤ the limit value n3; perform speed regulation according to the first speed regulation section in the characteristic curve.

[0070] By setting multiple speed control sections on the existing characteristic curve of mining engines, on the one hand, the power at the rated point corresponds to the rated load capacity to avoid excessive overload for users. At the same time, the power and torque from high torque to the rated point can be increased to ensure low-speed capacity. On the other hand, by combining multiple speed control sections, the engine speed control section can be automatically adjusted through load and slope recognition to further reduce fuel consumption.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for correcting a characteristic curve of a mining engine, characterized in that: The following steps are involved: Get the vehicle's load information and the current road slope information; When the vehicle is in a loaded state and the slope information X≤limit value n1, the speed regulation is performed according to the third speed regulation section in the characteristic curve; When the vehicle is in a loaded state and the limit value n1 < the slope information X ≤ the limit value n2, the speed regulation is performed according to the second speed regulation section in the characteristic curve; When the vehicle is in a loaded state and the limit value n2 < the slope information X ≤ the limit value n3; the speed is adjusted according to the first speed adjustment section in the characteristic curve; Among them, the characteristic curve includes at least 4 groups of speed regulation sections. The first speed regulation section is the torque curve corresponding to different speeds when the engine throttle opening is maximum, and the first speed regulation section has the highest target adaptive speed; in the first to fourth speed regulation sections, the target adaptive speed decreases step by step, the engine's carrying capacity decreases step by step, and the fuel consumption increases step by step.

2. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: When the vehicle is in an unloaded state and the slope information X>0, the speed is adjusted according to the third speed adjustment section in the characteristic curve.

3. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: When the vehicle is in an unloaded state and the slope information X≤0, the speed is adjusted according to the 4th speed adjustment section in the characteristic curve.

4. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: When the vehicle is in a loaded state and the slope information X ≤ the limit value n2, it is in a flat road or low slope condition; when the limit value n2 < the slope information X ≤ the limit value n3, it is in a high slope condition.

5. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: When the vehicle is in an unloaded state and the slope information X≤0, it is in a flat road and downhill condition; when the slope information X>0, it is in an uphill condition.

6. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: When the vehicle is an unmanned vehicle, the gear is automatically matched according to the corresponding speed regulation section and the current vehicle speed.

7. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: When the vehicle is a manned vehicle, if it is on a flat road or a low slope, select a high gear and cooperate with the engine to reduce the speed to ensure vehicle speed and reduce fuel consumption; if it is on a steep slope or uphill, select a low gear and cooperate with the engine to reduce the speed to ensure climbing ability.

8. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: When the vehicle is not in intelligent gear control mode, stop monitoring the engine status.

9. The method for correcting a characteristic curve of a mining engine according to claim 1, characterized in that: In the first to fourth speed regulation sections, the target adaptive speed is gradually reduced, specifically: the target adaptive speed is divided according to the first speed regulation section> the second speed regulation section> the third speed regulation section> the fourth speed regulation section; In the first to fourth speed regulation sections, the load capacity of the engine decreases step by step, specifically: the load capacity is divided according to the first speed regulation section> the second speed regulation section> the third speed regulation section> the fourth speed regulation section; In the 1st to 4th speed regulation sections, the fuel consumption increases step by step. Specifically, the fuel consumption is divided according to the 1st speed regulation section < the 2nd speed regulation section < the 3rd speed regulation section < the 4th speed regulation section.

10. A device for correcting a characteristic curve of a mining engine, characterized in that: include: The data acquisition module is configured to: when the vehicle is in the intelligent gear control mode, obtain the vehicle's load information and the current road slope information; The control module is configured to: when the vehicle is in a loaded state and the slope information X ≤ the limit value n1, perform speed regulation according to the third speed regulation section in the characteristic curve; The control module is further configured to: when the vehicle is in a loaded state and the limit value n1 < the slope information X ≤ the limit value n2, perform speed regulation according to the second speed regulation section in the characteristic curve; The control module is further configured to: when the vehicle is in a loaded state and the limit value n2 < the slope information X ≤ the limit value n3; perform speed regulation according to the first speed regulation section in the characteristic curve.

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