Control of variable geometry turbochargers

Abstract

A system, method, and computer program product may relate to variable geometry turbocharger (VGT) control and may include: using a processor to determine whether a coasting indicator indicating that the operating machinery is coasting is set; maintaining the VGT in the current blade configuration as long as the coasting indicator is set; and returning the VGT to its normal operation when it is determined that the coasting indicator has been reset.

Description

Technical Field

[0001] This disclosure relates to the control of a variable geometry turbocharger (VGT). Background Technology

[0002] A variable geometry turbocharger (VGT) is a device that regulates the intake air density of an internal combustion engine based on engine speed. Like a fixed-blade turbocharger, a VGT has both a turbine and an air compressor, but the turbine contains movable blades that regulate the incoming exhaust air to achieve the desired compressor speed. These movable blades define the VGT configuration at a given engine speed. However, operating the movable blades leads to wear, reducing the efficiency and lifespan of the VGT. This wear can be mitigated by minimizing the large sway in the blade configuration that occurs when a vehicle equipped with a VGT coasts.

[0003] U.S. Patent Application Publication 2023 / 0150502 (“'502 Publication”) describes an apparatus for receiving look-ahead information and storing such look-ahead information in one or more memory devices. A processor receives vehicle information regarding the operation of a vehicle (including an engine). The processor determines a coasting opportunity for the vehicle based on the look-ahead information and the vehicle information. The processor adjusts a cruise control set speed based on the determined coasting opportunity, and shuts off the engine during the determined vehicle coasting opportunity based on the adjustment of the cruise control set speed. Notably, it is understood that the '502 Publication uses “look-ahead data” to plan the time the vehicle can coast with the engine off.

[0004] Engineering and product development resources continue to seek opportunities to reduce wear and other damage to the VGT. Summary of the Invention

[0005] In one aspect of the invention, a working machine includes: an internal combustion engine; and a variable geometry turbocharger (VGT) configured to regulate the intake air density of the internal combustion engine. A control circuit can determine whether the working machine is coasting without using look-ahead data. The control circuit also sets a coasting flag when it determines that the working machine is coasting. The control circuit outputs control signals to maintain the current VGT blade configuration as long as the coasting flag is set.

[0006] In another aspect of the invention, an internal combustion engine for a work machine includes a variable geometry turbocharger (VGT) configured to regulate the intake air density of the internal combustion engine. An electromechanical control circuit sets a coasting indicator when it determines that the work machine is coasting. As long as the coasting indicator is set, the VGT control circuit maintains the current VGT blade configuration.

[0007] In another aspect of the invention, a variable geometry turbocharger (VGT) control method includes: using a processor to determine in real time whether a coasting indicator indicating that the operating machinery is coasting has been set. As long as the coasting indicator is set, the VGT remains in its current blade configuration; and when it is determined that the coasting indicator has been reset, the VGT returns to normal operation. Attached Figure Description

[0008] Figure 1 This is a schematic block diagram of an exemplary working machine that embodies the concept of the present invention.

[0009] Figure 2A and Figure 2B This is a set of diagrams explaining the VGT function of the operating machinery.

[0010] Figure 3 This is a schematic block diagram illustrating an exemplary sliding detector that embodies the concept of the present invention.

[0011] Figure 4 It is a diagram depicting the gliding characteristics that embody the concept of the present invention.

[0012] Figure 5 This is a set of diagrams demonstrating exemplary VGT gliding technology that embodies the concept of the present invention.

[0013] Figure 6 This is a flowchart of an exemplary VGT control process 600 that embodies the concept of the present invention. Detailed Implementation

[0014] The inventive concept is best described by way of certain embodiments thereof, which are described in detail herein in conjunction with the accompanying drawings, wherein the same reference numerals refer to the same features throughout the specification. It should be understood that the term "inventive" as used herein is intended to refer to the inventive concept behind the embodiments described below, and not merely to the embodiments themselves. It should also be understood that the general inventive concept is not limited to the exemplary embodiments described below, and the following description should be read from this perspective.

[0015] Additionally, the term "exemplary" as used herein means "as an example, instance, or illustration." Any embodiment of a construction, process, design, technique, etc., specified herein as exemplary is not necessarily to be construed as being more preferred or advantageous than other such embodiments.

[0016] The accompanying drawings described herein include schematic block diagrams illustrating various interoperable functional modules. Such diagrams are not intended to be used as electrical schematics, and the illustrated interconnections are intended to depict various interoperabilities between signal flows, functional components, and / or processes, and are not necessarily direct electrical connections between such components. Furthermore, the functions illustrated and described via individual components do not need to be distributed as shown in the figures, and the discrete blocks in the figures are not necessarily intended to depict discrete electrical components.

[0017] Figure 1 This is a schematic block diagram illustrating an exemplary working machine 100 that embodies the inventive concept. The inventive concept described herein can be applied to different types of internal combustion engines (e.g., gasoline engines, diesel engines, etc.), as will be understood by those skilled in the art. The working machine 100 may include an engine 120 (such as an internal combustion engine) that drives machinery 125 (such as, for example, a transmission system, a pneumatic and / or hydraulic pump for operating the working tool, a generator, etc.).

[0018] Engine 120 may include a variable geometry turbocharger (VGT) 110 configured to adjust the engine intake air density based on engine speed. For this purpose, VGT 110 may include a turbine 112 mechanically coupled to compressor 114 via a common shaft 115. Turbine 112 may be inserted into an exhaust circuit, typically exemplified at source exhaust duct 126 and return exhaust duct 127, through which VGT 110 obtains operating power. Compressor 114 may be coupled to a source of compressed air (such as ambient air) via intake port 116. Compressed air may be supplied to intake manifold 129 of engine 120 at an intake density dependent on the rotational speed of the compressor impeller 119 of the turbocharger.

[0019] Turbine 112 may be equipped with a set of movable blades, typically illustrated at blade 118, which are positioned by VGT controller 133. The position of blade 118 within turbine 112 is referred to herein as VGT configuration. Such VGT configuration controls the flow rate of gas (e.g., air) entering engine 120 by changing the aspect ratio of blade 118, thereby controlling the rotational speed of compressor 117. VGT configuration can be selected via VGT controller 133. Figure 1 As illustrated, the VGT controller 133 can be embedded in other circuits, such as the electronic control module (ECM) 130 of the operating machine 100. That is, either or both of the VGT controller 133 and the skid detector 135 can be implemented in the hardware and / or software of the electronic control module circuit 130.

[0020] Embodiments of the present invention can be configured to identify when the operating machinery 100 is in coasting mode. Such identification can be achieved in various ways by a suitable coasting detector 135, including by determining whether the accelerator pedal 154 in the operator's cab 150 is in the zero position, i.e., not actuated by pressing the accelerator pedal 154. Additionally or alternatively, identifying the coasting mode can be achieved by the state of the engine 120 (e.g., engine braking). It should be understood that identifying the coasting mode can be achieved without receiving look-ahead information.

[0021] Figure 2A and Figure 2B (Hereinafter referred to as Figure 2) is a set of diagrams illustrating typical VGT functionality. In the illustrated example, the work machine 100 can traverse a ground path at a ground speed 210, where the ground path is inclined at a slope 220, where a negative slope refers to a downhill slope relative to the motion of the work machine 100. In the illustrated example, at time t i At this time, the operator can release the accelerator pedal 154 to the zero position, which corresponds to zero throttle 234 and zero fuel rate 232, thereby achieving a short period of time t. i -t f A zero-throttle event 230 is defined. In response, the control circuitry on the work machinery 100 (e.g., ECM circuitry 130) can activate engine braking, as indicated by brake indicator 260, and thus reduce ground speed 210. In some embodiments, this brake indicator can serve as a coasting indicator. Additionally, in response to the zero-throttle event 230, the VGT can be forced (e.g., by the VGT controller 133) to reconfigure its blades 118 from a relatively open configuration to a relatively closed position, such as at time t. f Examples are given at the time.

[0022] Zero-throttle event 230 can be terminated in response to activation of throttle 234 and recirculation of fuel flow 232. This can force blade 118 to reconfigure from a relatively closed position to a relatively open position, as illustrated at VGT position signal 240. The increase in engine speed can be reflected in a corresponding increase in ground speed 210.

[0023] As illustrated in Figure 2, changes to the VGT configuration 240 may incur costs, as shown at damage signal 250, where the amplitude of damage signal 250 can represent the magnitude of the increment in damage parameters. Damage signal 250 can be generated retrospectively by estimating the forces and relative motions between parts, such that greater forces and greater motions result in greater damage. These forces can be mathematically determined in the engine control module circuit 130 using a combination of other engine sensors (e.g., intake manifold temperature / pressure, engine speed, etc.) and mathematical models.

[0024] return Figure 1 A zero-throttle event 230 can be identified from the position of the accelerator pedal 154 (or the throttle linkage or throttle sensor attached thereto) in the operator's cab 150 of the machine 100. Other techniques for determining the throttle position can also be used. Such a position can be provided to the coasting detector 135 to identify when the machine 100 is in coasting mode. As will be discussed below, the coasting detector 135 can monitor various parameters and generate its output, such as a coasting flag, based on these parameters meeting specific threshold conditions. When the coasting flag is active, the VGT controller 133 can freeze the VGT configuration (e.g., VGT blade 118) at the configuration of the VGT 110 found when the coasting flag is first activated. This is referred to herein as the current VGT configuration. In some embodiments, the coasting flag can remain active as long as the holding conditions exist.

[0025] Figure 3 This is a schematic block diagram of an exemplary coasting detector 300 that embodies the inventive concept. Here, the coasting detector 300 can implement an AND function 330 for a set of parameters. For example, it can determine whether a gear threshold 305 (e.g., gear ≥ 3F), a throttle threshold 310 (e.g., throttle < 5%), a gradient threshold 315 (e.g., gradient > -5%), and a vehicle speed threshold 320 (e.g., vehicle speed ≥ 16 km / h) are met. When the aforementioned conditions are met, coasting can be enabled, as illustrated at coasting indicator enabled 335. The coasting indicator remains active as long as the gear threshold 305, throttle threshold, and gradient threshold are met, as illustrated at coasting indicator held 340. Coasting can be disabled when any of the gear threshold 305, throttle threshold 310, or gradient threshold 315 is no longer active. It should be understood that parameters other than those described above can be used to enable and / or maintain the state of the coasting detector to achieve the inventive concept.

[0026] Figure 4 This is a diagram depicting the gliding characteristics that embody the inventive concept. Normal operation of the VGT controller 133 is indicated at configuration 435. The VGT configuration 435 established immediately before the gliding flag 405 is set is referred to herein as the current VGT configuration 435. The VGT configuration established immediately after the gliding flag 405 is reset is referred to herein as the new VGT configuration 437. Both the current VGT configuration 435 and the new VGT configuration 437 are established through normal VGT operation.

[0027] At a certain point in time, the operator can adjust their speed by coasting, and accordingly, coasting indicator 405 can be set, such as by electronic control module circuitry 130. This may occur when the operator releases the throttle (e.g., accelerator pedal 154). In the absence of the coasting feature described herein, the VGT can be configured according to configuration 410, which includes a wide sway in the VGT blade position. However, the coasting feature of the present invention maintains the current VGT configuration (e.g., VGT configuration 435) throughout the coasting event, as exemplified by VGT configuration 415.

[0028] When the coasting indicator 405 is deactivated, such as when the accelerator pedal 154 is activated by a mechanical operator, the coasting configuration 415 can maintain the coasting for a de-jittering time period t. DB 420. The termination of this time period may cause VGT control to return to normal operation. In some embodiments, VGT control may return to normal operation at a predetermined ramp rate, as illustrated at VGT configuration ramp 430. VGT configuration ramp 430 connects VGT configuration 415 to a new VGT configuration 437 to control unwanted artifacts caused by abrupt and / or wide-amplitude transitions.

[0029] Figure 5 This is a set of diagrams demonstrating an exemplary VGT coasting technique that embodies the inventive concept. The upper panel depicts the coasting indicator signal 510, the middle panel depicts the VGT position signals with and without the coasting feature (VGT position signal 522), and the lower panel depicts a comparison of blade damage between a VGT without the coasting feature and a VGT with the coasting feature of the inventive concept. That is, damage suffered by the VGT without the coasting feature is depicted at damage signal 532, and damage suffered by the VGT with the coasting feature is depicted at damage signal 535. In the illustrated embodiment, the damage reduction achieved by implementing the coasting control of the inventive concept can be 10% to 20%.

[0030] Figure 6 This is a flowchart of a method, process, operation, and / or function 600 according to embodiments of the disclosed subject matter. Some or all of the operations in method 600 can be performed via a non-transitory computer-readable storage medium (or media) having instructions stored thereon, which, when executed by one or more processors, cause the one or more processors to perform some or all of the operations in the method. According to one or more embodiments, method 600 may be referred to or characterized as a method for controlling a variable geometry turbocharger (VGT). Therefore, Figure 6 This is a flowchart of an exemplary VGT control process 600 that embodies the concept of the present invention.

[0031] Normal operation of the VGT is indicated in operation 605. In operation 610, it can be determined whether the coasting flag is set. If so, process 600 can proceed to operation 615, where the VGT configuration remains in its current state. In operation 620, it can be determined whether the coasting flag has been reset. If so, process 600 can proceed to operation 625, through which the current VGT configuration is maintained for the debounce period (e.g., 3 seconds). In operation 630, it can be determined whether the debounce period has elapsed. If so, process 600 can proceed to operation 635, through which the VGT is returned to normal operation at a reset rate, for example, by gradually adjusting to a new VGT configuration determined by normal VGT control.

[0032] Industrial applicability

[0033] Mechanical wear can occur through friction when mechanical parts come into contact with and move relative to other mechanical parts. As mechanical parts wear down, efficiency and mechanical life may decrease accordingly. Lubricants are typically used to reduce friction, but some designs (such as during retrofitting) are not equipped with lubrication mechanisms. Therefore, other technologies for reducing mechanical wear are needed, where available.

[0034] Wear and other damage can be further mitigated by reducing the movement between mechanical parts. For a variable geometry turbocharger (VGT), the target mechanical parts include movable blades on the turbocharger's turbine. These blades are triggered by a controller to rotate the turbocharger's compressor at a specific rate at a given engine speed. The compressor speed determines the engine's intake air density. The controller can be used to operate the VGT in a manner that minimizes the movement between the blades and the VGT body.

[0035] A machine operator can modify the machine's ground speed by coasting, for example, by releasing the machine's throttle (e.g., a pedal-controlled throttle). Such control, when adjusting vehicle speed using the throttle through rapid closing / opening actions, can result in additional VGT motion. Typically, coasting is a brief event, but during coasting, the VGT blades can be configured from a relatively open position to a relatively closed position within a short period. To reduce wear, such wide-amplitude blade motion within a short time can be avoided.

[0036] One or more embodiments of this disclosure can implement control systems, methods, and computer programming products for vehicles based on variable geometry turbochargers (VGT) to improve durability. The vehicle or transmission ECM can send a signal to the engine ECM to indicate that the vehicle is coasting. Furthermore, the engine ECM can use this signal to deactivate VGT movement, for example, in response to a brief operator depressing a pedal. Therefore, one or more embodiments of this disclosure can detect when the vehicle is coasting and instruct the VGT to maintain its configuration for a set time to avoid movement caused by rapid throttle off / on events.

[0037] Embodiments of this invention can maintain the current blade configuration for a short period during taxiing. That is, any blade configuration established before the taxiing event will be maintained throughout the entire taxiing event. Therefore, brief wide swings in blade configuration can be avoided, and corresponding mechanical wear can be reduced. This invention can be embodied in implementing such taxiing techniques.

[0038] According to one or more embodiments of this disclosure, information about vehicle coasting can be used to identify opportunities to pause VGT operation. That is, according to one or more embodiments, the coasting state can be used to freeze VGT movement, for example, to improve VGT durability. Alternatively, instead of using "look-ahead data," real-time data can be used to determine the current state of the operating machinery.

[0039] As those skilled in the art will understand, aspects of this disclosure can be embodied as systems, methods, or computer program products. Therefore, aspects of the invention can take the form of entirely hardware embodiments, entirely software embodiments (including firmware, resident software, microcode, etc.), or embodiments combining software and hardware aspects, which are generally referred to herein as “circuit,” “module,” or “system.” Furthermore, aspects of the invention can take the form of a computer program product embodied in one or more computer-readable media having computer-readable program code thereon.

[0040] The functions of the elements disclosed herein can be implemented using circuitry or processing circuitry, including general-purpose processors, special-purpose processors, integrated circuits, ASICs (“Application-Specific Integrated Circuits”), conventional circuitry, and / or combinations thereof configured or programmed to perform the disclosed functions. A processor is considered to be processing circuitry or a circuit that includes transistors and other circuitry. A processor can be a programmable processor that executes a program stored in memory. In this invention, a circuit, unit, or device is hardware that performs or is programmed to perform the listed functions. This hardware can be any hardware disclosed herein or otherwise known that is programmed or configured to perform the listed functions. When the hardware is a processor that can be considered a type of circuit, the circuit, device, or unit is a combination of hardware and software used to configure the hardware and / or processor.

[0041] Further, as used herein, the term "circuit" may refer to any or all of the following: (a) a hardware circuit implementation only (such as an implementation in analog and / or digital circuits only); (b) a combination of circuitry and software (and / or firmware), such as (if applicable): (i) a combination of processors or (ii) a processor / software (including digital signal processors), software, and memory portion that work together to enable a device such as a mobile phone or server to perform various functions); and (c) a circuit, such as a microprocessor or a portion of a microprocessor, which requires software or firmware to operate, even if the software or firmware is not physically present. This definition of "circuit" may be applied to all uses of the term in this invention, including in any claim. As a further example, as used herein, the term "circuit" may also cover an implementation of a processor (or processors) only or a portion of a processor and its accompanying software and / or firmware.

[0042] According to some exemplary embodiments of the present invention, the terms "data," "content," "information," and similar terms may be used interchangeably to refer to data capable of being transmitted, received, manipulated, and / or stored. The term "network" may refer to a group of interconnected computers or other computing devices. Within a network, these computers or other computing devices may be interconnected directly or indirectly via various means, including via one or more switches, routers, gateways, access points, etc.

[0043] The aspects of the invention have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. In this regard, the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the invention. For example, each block in a flowchart or block diagram may represent a portion of a module, segment, or code including one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than indicated in the figures. For example, depending on the functions included, two blocks shown consecutively may actually be executed substantially simultaneously, or these blocks may sometimes be executed in reverse order. It should also be noted that each block in the block diagrams and / or flowchart illustrations, and combinations of blocks in the block diagrams and / or flowchart illustrations, may be implemented by a system based on dedicated hardware, or a combination of dedicated hardware and computer instructions, that performs the specified function or action.

[0044] It should also be understood that each box in the flowchart illustration and / or block diagram, and combinations of boxes in the flowchart illustration and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions / actions specified in one or more boxes of the flowchart and / or block diagram.

[0045] These computer program instructions may also be stored in a computer-readable medium that can direct a computer, other programmable data processing apparatus, or other means to operate in a particular manner, such that the instructions stored in the computer-readable medium produce an article of writing including instructions that implement the functions / actions specified in one or more boxes of a flowchart and / or block diagram. The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other means to cause a series of operational steps to be performed on the computer, other programmable apparatus, or other means, thereby producing a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide a process for implementing the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0046] Embodiments of the disclosed subject matter can also be described using the following brackets.

[0047] (1). A working machine comprising: an internal combustion engine; a variable geometry turbocharger (VGT) configured to adjust the intake air density of the internal combustion engine; and control circuitry configured to: determine that the working machine is coasting without using look-ahead data; set a coasting flag when the working machine is determined to be coasting; and output control signals to maintain the current VGT blade configuration as long as the coasting flag is set.

[0048] (2). The working machine according to (1), wherein the determination that the working machine is gliding is achieved by the zero position of the accelerator control device.

[0049] (3). The working machine according to (1), wherein the coasting flag is set when the gear threshold, throttle threshold, slope threshold and speed threshold are satisfied.

[0050] (4). The working machine according to (1) or (3), wherein the coasting indicator is maintained as long as the gear threshold, the throttle threshold and the slope threshold are satisfied.

[0051] (5). The working machine according to (1), wherein the current blade configuration is maintained during the de-vibration period after the coasting enable flag is reset.

[0052] (6). The operating machinery according to (1) or (5), wherein the current blade configuration is gradually adjusted at a reset rate to meet the new blade configuration determined by normal VGT operation.

[0053] (7). An internal combustion engine for a work machine, the work machine comprising: a variable geometry turbocharger (VGT) configured to adjust the intake air density of the internal combustion engine; an electromechanical control circuit configured to set a coasting indicator when it is determined that the work machine is coasting; and a VGT control circuit configured to maintain the current VGT blade configuration as long as the coasting indicator is set.

[0054] (8). The internal combustion engine according to (7), wherein the determination that the working machinery is gliding is achieved by the zero position of the accelerator control device.

[0055] (9). The internal combustion engine according to (7), wherein the coasting flag is set when it is determined that the gear threshold, throttle threshold, gradient threshold and speed threshold are met.

[0056] (10). According to the internal combustion engine of (7) or (9), the coasting activation flag is maintained as long as the gear threshold, the throttle threshold and the slope threshold are met.

[0057] (11). The internal combustion engine according to (7), wherein the current blade configuration is maintained during the de-vibration period after the coasting mark is reset.

[0058] (12). The internal combustion engine according to (7) or (11), wherein the current blade configuration is gradually adjusted at a reset rate to meet the new blade configuration determined by normal VGT operation.

[0059] (13). The internal combustion engine according to (7), wherein the determination that the working machinery is gliding is achieved without using look-ahead data.

[0060] (14). A variable geometry turbocharger (VGT) control method, the method comprising: using a processor to determine in real time whether a coasting indicator indicating that a working machine is coasting is set; maintaining the VGT in a current blade configuration as long as the coasting indicator is set; and causing the VGT to return to its normal operation when it is determined that the coasting indicator has been reset.

[0061] (15). According to the method of (14), returning the VGT to normal operation includes: maintaining the current blade configuration during the de-jittering period; and returning the VGT to normal operation after the de-jittering period.

[0062] (16). According to the method of (15), the method further includes: after the de-jittering time period, gradually adjusting the current blade configuration to a new blade configuration according to the normal operation of the VGT.

[0063] (17). According to the method of (14), the method further includes setting the coasting flag when it is determined that the gear threshold, throttle threshold, slope threshold and speed threshold are met.

[0064] (18). According to the method of (14) or (17), the coasting flag is maintained as long as the gear threshold, the throttle threshold and the slope threshold are satisfied.

[0065] (19). According to the method of (14), the method further includes: configuring the VGT according to the current blade configuration from the previous blade configuration before maintaining the VGT in the current blade configuration as long as the coasting flag is set.

[0066] (20). The method according to (14), wherein the determination that the working machinery is gliding is achieved without using look-ahead data.

[0067] The foregoing description is intended to illustrate possible embodiments of the inventive concept and is not intended to be limiting. Many variations, modifications, and alternatives will become apparent to those skilled in the art upon review of this disclosure. For example, components equivalent to those shown and described can be substituted, and thus individually described elements and methods can be combined, and discrete elements can be distributed across many components. Therefore, the scope of the invention should not be determined by reference to the foregoing description but rather by reference to the appended claims and all their equivalents.

Claims

1. An internal combustion engine for a working machine, the working machine comprising: A variable geometry turbocharger (VGT) is configured to adjust the intake air density of the internal combustion engine; An electromechanical control circuit, configured to set a coasting indicator when it is determined that the working machine is coasting; The VGT control circuit is configured to maintain the current VGT blade configuration as long as the coasting flag is set.

2. The internal combustion engine according to claim 1, wherein the determination that the working machinery is gliding is achieved by the zero position of the accelerator control device.

3. The internal combustion engine according to claim 1, wherein the coasting flag is set when it is determined that the gear threshold, throttle threshold, gradient threshold and speed threshold are met.

4. The internal combustion engine according to claim 3, wherein the coasting activation flag is maintained as long as the gear threshold, the throttle threshold and the gradient threshold are satisfied.

5. The internal combustion engine of claim 1, wherein the current blade configuration is maintained during the de-vibration period after the coasting indicator is reset.

6. The internal combustion engine of claim 5, wherein the current blade configuration is gradually adjusted at a reset rate to meet a new blade configuration determined by normal VGT operation.

7. The internal combustion engine of claim 1, wherein the determination that the working machinery is coasting is achieved without using look-ahead data.

8. A variable geometry turbocharger (VGT) control method, the method comprising: The processor determines in real time whether a sliding indicator indicating that the working machinery is sliding has been set; As long as the coasting flag is set, the VGT will remain in the current blade configuration; and When it is determined that the coasting flag has been reset, the VGT is returned to its normal operation.

9. The method of claim 8, wherein causing the VGT to return to normal operation comprises: Maintain the current blade configuration during the de-vibration period; as well as After the dejittering period, the VGT is returned to normal operation.

10. The method according to claim 9, further comprising: After the de-jittering period, the current blade configuration is gradually adjusted to a new blade configuration based on the normal operation of the VGT.

11. The method according to claim 8, further comprising: The coasting flag is set when the gear threshold, throttle threshold, gradient threshold, and speed threshold are met.

12. The method of claim 11, wherein the coasting indicator is maintained as long as the gear threshold, the throttle threshold, and the slope threshold are satisfied.

13. The method according to claim 8, further comprising: Before the VGT is maintained in the current blade configuration as long as the coasting flag is set, the VGT is configured according to the current blade configuration from the previous blade configuration.

14. The method of claim 8, wherein the determination that the working machinery is gliding is achieved without using look-ahead data.

Images