Clutching multi-speed ratio air compressor and control method thereof

Abstract

The application belongs to the technical field of automobile equipment, and particularly relates to a clutch multi-speed-ratio air compressor and a control method thereof. The clutch multi-speed-ratio air compressor comprises a crankshaft, at least two belt pulleys and at least two electromagnetic clutch devices. The output end of the crankshaft extends out of the air compressor. The at least two belt pulleys are installed on the output end of the crankshaft, and are used to be connected with an engine to form different speed ratios. The electromagnetic clutch devices are fixedly connected to the crankshaft, and each electromagnetic clutch device is arranged in correspondence with one belt pulley to connect the corresponding belt pulley and the crankshaft. The clutch multi-speed-ratio air compressor can select a corresponding operation mode according to real-time working conditions, thereby reducing the load of the air compressor and the wear of the air compressor piston ring set, while ensuring that the air compressor can quickly respond to meet the functional requirements when the air compressor needs to work, and improving the reliability of the air compressor.

Description

Technical Field

[0001] This invention belongs to the field of automotive equipment technology, specifically relating to a multi-speed air compressor with clutch and its control method. Background Technology

[0002] Currently, air compressors have a relatively high failure rate, with the main failure mode being oil leakage. This occurs when engine oil passes through the air compressor's piston ring assembly, is compressed into the air compressor cylinders, and is then expelled from the air compressor, leaking out through the vehicle's dryer. Symptoms include heavy oil buildup at the dryer's drain port, rapid engine oil consumption, and a poor visual appearance. The primary cause of oil leakage is the friction between the air compressor's piston rings and cylinder liners, which requires engine oil for lubrication and cooling. Inappropriate design dimensions or harsh operating conditions can lead to wear on the air compressor's piston ring assembly, resulting in oil leakage. Furthermore, continuous operation after the car starts accelerates piston ring wear and increases the vehicle's power consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-speed air compressor with clutch and its control method, which can solve the problem of accelerated piston ring wear caused by the continuous operation of the air compressor, and at the same time solve the problems of slow air pumping and excessive oil discharge with the air.

[0004] The first aspect of this invention provides a clutch-driven multi-speed ratio air compressor, comprising:

[0005] A crankshaft, the output end of which extends from the air compressor;

[0006] At least two pulleys, both of which are mounted on the output end of the crankshaft, and at least two of which are used to connect to the engine to form different speed ratios;

[0007] At least two electromagnetic clutches are fixed to the crankshaft, and each electromagnetic clutch is correspondingly provided with a pulley to connect the corresponding pulley to the crankshaft.

[0008] The clutch-driven multi-speed ratio air compressor provided by this invention may also have the following additional technical features:

[0009] In one specific embodiment of the present invention, the electromagnetic clutch device includes:

[0010] The transmission assembly includes a suction disc and a transmission disc connected by a spring plate, the transmission disc being fixed to the crankshaft;

[0011] An electromagnet core is disposed in the inner cavity of the pulley and has a coil embedded thereon. When energized, it can attract the suction plate to drive the transmission plate and crankshaft to rotate.

[0012] In one specific embodiment of the present invention, the pulley is provided with an annular groove on the side opposite to the electromagnetic clutch device, and the electromagnet core is disposed in the inner cavity formed by the annular groove.

[0013] In one specific embodiment of the present invention, the pulley is made of a magnetic material, preferably iron.

[0014] In one specific embodiment of the present invention, there are two pulleys and two electromagnetic clutches, and the opening directions of the annular grooves of the two pulleys are the same.

[0015] In one specific embodiment of the present invention, the transmission disc is fixedly connected to the crankshaft via a connecting key.

[0016] A second aspect of the present invention also provides a control method for a clutch multi-speed ratio air compressor as described in any one of the above claims, comprising the following steps:

[0017] Working status judgment steps: Detect the gas cylinder pressure in the start-up state and compare it with the first threshold. Determine whether it is in the gas pumping state or the gas usage state based on the comparison result. If it is in the gas usage state, execute the non-pumping step; otherwise, continue to the gas pumping state judgment step.

[0018] Air pumping status judgment steps: Detect the pressure inside the gas cylinder and compare it with the second threshold. Based on the comparison result, select either the slow air pumping step or the fast air pumping step to start.

[0019] Rapid air inflation procedure: Connect the power supply to the electromagnetic clutch device connected to the high-speed belt pulley. The high-speed belt pulley transmits the engine power to the crankshaft, which rotates rapidly to drive the air compressor to inflate the air quickly.

[0020] Slow air pumping procedure: Connect the power supply to the electromagnetic clutch device connected to the low-speed ratio pulley. The engine power is transmitted to the crankshaft through the low-speed ratio pulley. The crankshaft rotates slowly to drive the air compressor to pump air slowly.

[0021] Steps to prevent air from being pumped: Disconnect the power supply to the electromagnetic clutch device. All pulleys will spin freely on the bearings, the crankshaft power will be interrupted, and the air compressor will not pump air.

[0022] In one specific embodiment of the present invention, the first threshold includes a first transition threshold for transitioning from an inflation state to a gas usage state and a second transition threshold for transitioning from a gas usage state to an inflation state, wherein the first transition threshold is greater than the second transition threshold.

[0023] In one specific embodiment of the present invention, the first transition threshold is 12 bar, and the second transition threshold is 10 bar.

[0024] A third aspect of the present invention also provides an automobile, the automobile comprising the clutch multi-speed air compressor described in any one of the preceding claims.

[0025] The multi-speed air compressor with clutch provided by this invention uses at least two pulleys connected to the engine to form different speed ratios, and utilizes an electromagnetic clutch device to control the connection between the pulleys and the air compressor crankshaft. Through the electromagnetic clutch principle, the air compressor does not operate when not pumping air, pumps air at a low speed ratio when needed, and operates at a high speed ratio when pumping air is urgently required. In other words, the multi-speed air compressor with clutch provided by this invention can select the corresponding operating mode according to real-time working conditions, thereby reducing the load on the air compressor, reducing wear on the air compressor piston ring assembly, while ensuring rapid response to meet functional requirements when the air compressor needs to operate, improving the reliability of the air compressor. When not pumping air, power transmission is completely interrupted, reducing fuel consumption. The above-mentioned configuration reduces piston ring wear through intermittent operation, and also alleviates the problems of slow air pumping and excessive oil discharge with the air. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of a multi-speed air compressor with clutch in a specific embodiment of the present invention.

[0028] Figure 2 Exploded view of the pulley and electromagnetic clutch device;

[0029] Figure 3 This is a logic diagram of the inflation process.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Air compressor, 2-Low-speed ratio electromagnet core, 3-Low-speed ratio pulley, 4-Low-speed ratio spring plate, 5-Low-speed ratio suction plate, 6-Low-speed ratio transmission plate, 7-Low-speed ratio connecting key, 8-Fasting screw, 9-Rotating bearing, 10-Crankshaft, 11-High-speed ratio pulley, 12-High-speed ratio transmission plate, 13-High-speed ratio suction plate, 14-High-speed ratio spring plate, 15-High-speed ratio electromagnet core. Detailed Implementation

[0032] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0033] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0034] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0035] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0036] like Figure 1-2 As shown, the first aspect of the present invention provides a multi-speed air compressor 1 with clutch, the air compressor 1 including a crankshaft 10, at least two pulleys and at least two electromagnetic clutch devices, wherein the output end of the crankshaft 10 extends out of the air compressor 1; at least two pulleys are mounted on the output end of the crankshaft 10, and the at least two pulleys are used to connect to an engine to form different speed ratios; the electromagnetic clutch devices are fixed to the crankshaft 10, and each electromagnetic clutch device is correspondingly arranged with one of the pulleys to connect the corresponding pulley to the crankshaft 10.

[0037] Specifically, in the above structure, the two pulleys are a high-speed ratio pulley 11 and a low-speed ratio pulley 3, and the two electromagnetic clutches are a high-speed ratio electromagnetic clutch and a low-speed ratio electromagnetic clutch. The high-speed ratio pulley 11 is mounted on the crankshaft 10 via a rotating bearing 9, and its linkage with the crankshaft 10 is controlled by the high-speed ratio electromagnetic clutch connected to it. The low-speed ratio pulley 3 is mounted on the crankshaft 10 via a rotating bearing 9, and its linkage with the crankshaft 10 is controlled by the low-speed ratio electromagnetic clutch connected to it. By starting different pulleys, the crankshaft 10 can be driven to rotate at different speeds, thereby providing different power to the air compressor 1.

[0038] Through the above structure, the air compressor 1 can have at least three operating states, thereby meeting the pressure requirements in different situations. Specifically, the three operating states are: rapid air pumping state, slow air pumping state, and no air pumping state. The rapid air pumping state can shorten the air pumping time and meet the needs of emergency air use; the slow air pumping state reduces the speed of the air compressor 1 to ensure reliability; and the no air pumping state can realize the zero speed of the air compressor 1, reducing power consumption and improving reliability.

[0039] The multi-speed air compressor 1 provided by this invention can select the corresponding operating mode according to the real-time working conditions, thereby reducing the load of the air compressor 1, reducing the wear of the piston ring assembly of the air compressor 1, and ensuring that the air compressor 1 can quickly respond to meet the functional requirements when it needs to work, thus improving the reliability of the air compressor 1.

[0040] In one specific embodiment of the present invention, the electromagnetic clutch device includes a transmission assembly and an electromagnet core. The transmission assembly includes a pull-in disc and a transmission disc connected by a spring plate. The transmission disc is fixed to the crankshaft 10 by a connecting key. The electromagnet core is disposed in the inner cavity of the pulley and has a coil embedded thereon. When energized, it can attract the pull-in disc to drive the transmission disc and the crankshaft 10 to rotate.

[0041] In the transmission assembly of the low-speed ratio electromagnetic clutch, the low-speed ratio transmission disc 6 is fixed to the crankshaft 10 via a low-speed ratio connecting key 7 and rotates synchronously with the crankshaft 10; the low-speed ratio engagement disc 5 is mounted on the low-speed ratio transmission disc 6 via a low-speed ratio spring plate 4 and rotates synchronously with the low-speed ratio transmission disc 6. Specifically, the low-speed ratio spring plate 4 is fixedly connected to the low-speed ratio engagement disc 5 and the low-speed ratio transmission disc 6 respectively via fastening screws 8, and based on the low-speed ratio spring plate 4, the low-speed ratio engagement disc 5 is pressed against the low-speed ratio transmission disc 6 under normal conditions. The low-speed ratio electromagnet core 2 has a coil embedded in it, which forms an electromagnet when energized, thereby attracting the low-speed ratio engagement disc 5 in the transmission assembly, causing the low-speed ratio engagement disc 5 to rotate together with the low-speed ratio pulley 3, thereby driving the transmission assembly and, through the transmission assembly, driving the crankshaft 10 to rotate together, thus transmitting power from the engine to the air compressor 1 to achieve slow air pumping.

[0042] Similarly, in the transmission assembly of the high-speed ratio electromagnetic clutch device, the high-speed ratio transmission disc 12 is fixed to the crankshaft 10 via a high-speed ratio connecting key and rotates synchronously with the crankshaft 10; the high-speed ratio engagement disc 13 is mounted on the high-speed ratio transmission disc 12 via a high-speed ratio spring plate 14 and rotates synchronously with the high-speed ratio transmission disc 12. Specifically, the high-speed ratio spring plate 14 is fixedly connected to the high-speed ratio engagement disc 13 and the high-speed ratio transmission disc 12 via fastening screws, and based on the high-speed ratio spring plate 14, the high-speed ratio engagement disc 13 is pressed against the high-speed ratio transmission disc 12 under normal conditions. The high-speed ratio electromagnet core 15 has a coil embedded in it, which forms an electromagnet when energized, thereby attracting the high-speed ratio engagement disc 13 in the transmission assembly, causing the high-speed ratio engagement disc 13 to rotate together with the high-speed ratio pulley 11, thereby driving the transmission assembly and driving the crankshaft 10 to rotate together, thus transmitting power from the engine to the air compressor 1, achieving rapid air pumping.

[0043] In one specific embodiment of the present invention, the pulley is provided with an annular groove on the side opposite to the electromagnetic clutch device, and the electromagnet core is disposed in the inner cavity formed by the annular groove.

[0044] In one specific embodiment of the present invention, the pulley is made of a magnetically conductive material, preferably iron. The low-speed ratio pulley has a larger diameter, while the high-speed ratio pulley has a smaller diameter.

[0045] In one specific embodiment of the present invention, there are two pulleys and two electromagnetic clutches, and the opening directions of the annular grooves of the two pulleys are the same. That is, there are two pulleys, one for high speed and one for low speed.

[0046] In one specific embodiment of the present invention, the transmission disc is fixedly connected to the crankshaft 10 via a connecting key.

[0047] In one specific embodiment of the present invention, a first friction part is provided on the side of the suction disc near the pulley, and a second friction part is provided on the side of the pulley near the suction disc, with the first friction part and the second friction part being provided correspondingly.

[0048] Specifically, such as Figure 3 As shown, another aspect of the present invention provides a control method for the clutch multi-speed ratio air compressor 1 described in any one of the above claims, comprising the following steps:

[0049] Working status judgment steps: Detect the gas cylinder pressure in the start-up state and compare it with the first threshold. Determine whether it is in the gas pumping state or the gas usage state based on the comparison result. If it is in the gas usage state, execute the non-pumping step; otherwise, continue to the gas pumping state judgment step.

[0050] Air pumping status judgment steps: Detect the pressure inside the gas cylinder and compare it with the second threshold. Based on the comparison result, select either the slow air pumping step or the fast air pumping step to start.

[0051] Rapid air inflation procedure: Connect the power supply to the electromagnetic clutch device connected to the high-speed belt pulley. The high-speed belt pulley transmits the engine power to the crankshaft, which rotates rapidly to drive the air compressor to inflate the air quickly.

[0052] Slow air pumping procedure: Connect the power supply to the electromagnetic clutch device connected to the low-speed ratio pulley. The engine power is transmitted to the crankshaft through the low-speed ratio pulley. The crankshaft rotates slowly to drive the air compressor to pump air slowly.

[0053] Steps to prevent air from being pumped: Disconnect the power supply to the electromagnetic clutch device. All pulleys will spin freely on the bearings, the crankshaft power will be interrupted, and the air compressor will not pump air.

[0054] Specifically, in the working status judgment step, when the gas cylinder pressure is greater than the first threshold, it is in the gas usage state, and when the gas cylinder pressure is less than the first threshold, it is in the air pumping state. When in the gas usage state, the non-air pumping step is executed, and when in the air pumping state, the next air pumping status judgment step is performed.

[0055] In the inflation status judgment step, a rapid inflation step is performed when the pressure inside the gas cylinder is less than the second threshold, and a slow inflation step is performed when the pressure inside the gas cylinder is greater than the second threshold.

[0056] In one specific embodiment of the present invention, the first threshold includes a first transition threshold for transitioning from an inflation state to a gas usage state and a second transition threshold for transitioning from a gas usage state to an inflation state, wherein the first transition threshold is greater than the second transition threshold.

[0057] Specifically, in the inflation state, when the cylinder pressure rises to the first transition threshold, it is determined to switch to the gas usage state and the control logic for the gas usage state is executed.

[0058] When using gas, if the cylinder pressure exceeds the second transition threshold, the air compressor stops pumping gas, and the "no pumping" step is executed. As gas usage continues, the cylinder pressure gradually decreases until it falls below the second transition threshold, at which point the system switches to pumping mode, and the pumping mode control logic is executed.

[0059] The first transition after starting the engine is by default from the inflation state to the air consumption state, and this cycle repeats.

[0060] In one specific embodiment of the present invention, the first transition threshold is 12 bar, the second transition threshold is 10 bar, and the second threshold is 10 bar.

[0061] Specifically, in the air pumping mode, when the cylinder pressure rises to ≥12 bar, the system is switched to the air consumption mode, and the control logic for the air consumption mode is executed. In the air consumption mode, when the cylinder pressure is ≥10 bar, the air compressor stops pumping air. As air is consumed, the cylinder pressure gradually decreases until it is <10 bar, at which point the system is switched back to the air pumping mode, and the control logic for the air pumping mode is executed. This cycle repeats continuously.

[0062] Once the system is determined to be in inflation mode, the inflation control logic is executed. Inflation mode is further divided into rapid inflation and slow inflation. After starting the engine, in inflation mode, the cylinder pressure will gradually increase: when the cylinder pressure is <10 bar, rapid inflation is performed. When 10 bar ≤ cylinder pressure < 12 bar, slow inflation is performed. When the cylinder pressure is ≥12 bar, the system is determined to be in use mode, and the use mode control logic is executed.

[0063] The purpose of dividing the air pumping control into fast and slow pumping steps is twofold: first, fast pumping ensures the cylinder pressure meets usage requirements, and then slow pumping reduces the compressor load and minimizes wear on the compressor piston ring assembly. When the slow pumping step is initiated, the cylinder volume already meets basic usage needs, so slow pumping does not affect the basic volume requirement. Simultaneously, the back pressure is relatively high, which reduces the compressor speed, decreasing its workload and friction, allowing more time for heat exchange, thus lowering the compressor's exhaust temperature and improving its reliability.

[0064] The specific process of the slow air compression step is as follows: The ECU controls the high-speed ratio electromagnetic coil in the high-speed ratio electromagnetic clutch device to be de-energized. At this time, the magnetic force in the high-speed ratio electromagnetic clutch device disappears and disconnects the connection between the high-speed ratio pulley 11 and the crankshaft 10, thereby interrupting the power input and allowing the high-speed ratio pulley to idle on the crankshaft. After 1 second, the ECU controls the coil of the low-speed ratio electromagnetic core in the electromagnetic clutch device to be energized. At this time, a magnetic force is generated near the low-speed ratio pulley 3, attracting the low-speed ratio engagement plate 5 of the low-speed ratio electromagnetic clutch device. The low-speed ratio engagement plate 5 is attracted to the low-speed ratio pulley 3. The low-speed ratio engagement plate 5 is connected to the low-speed ratio transmission plate 6 through the low-speed ratio spring plate 4 and the fastening screw 8. The low-speed ratio transmission plate 6 is connected to the crankshaft 10 of the air compressor 1 through the connecting key 7. At this time, power is transmitted from the low-speed ratio pulley 3, the low-speed ratio engagement plate 5, the low-speed ratio spring plate 4, the low-speed ratio transmission plate 6, and the connecting key 7 to the air compressor 1 assembly, realizing the low-speed operation of the air compressor 1.

[0065] The control logic for the rapid air inflation step is basically the same as that for the slow air inflation step. The difference is that the low-speed electromagnetic clutch is disengaged while the high-speed electromagnetic clutch is engaged, thereby causing the high-speed pulley to drive the crankshaft to rotate and transmit power to the air compressor 1 assembly, thus enabling the air compressor 1 to operate at high speed.

[0066] The specific process of the non-inflating step is as follows: both electromagnetic clutches are de-energized, the magnetic force disappears, and their respective engagement discs are pulled back by the spring force, interrupting the connection with the pulleys. Each pulley spins on its respective bearing. At this time, the air compressor crankshaft 10 does not rotate, and the air compressor 1 is stationary, thus achieving almost zero power consumption.

[0067] When switching between different speeds, a 1-second interval is required to prevent the crankshaft 10 from being subjected to different torques while the two speed states are running simultaneously, which could cause inconsistent speeds, belt breakage, and other problems.

[0068] In another aspect, the present invention provides an automobile comprising the clutch multi-speed air compressor 1 described in any one of the preceding claims.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a multi-speed air compressor with clutch, characterized in that, include: A crankshaft, the output end of which extends from the air compressor; At least two pulleys, both of which are mounted on the output end of the crankshaft, and at least two of which are used to connect to the engine to form different speed ratios; At least two electromagnetic clutches are fixed to the crankshaft, and each electromagnetic clutch is correspondingly provided with a pulley to connect the corresponding pulley to the crankshaft; The control method includes the following steps: Working status judgment steps: Detect the cylinder pressure in the start-up state and compare it with the first threshold. Determine whether it is in the inflation state or the gas usage state based on the comparison result. When the cylinder pressure is greater than the first threshold, it is in the gas usage state, and when the cylinder pressure is less than the first threshold, it is in the inflation state. If it is in the gas usage state, execute the non-inflation step; otherwise, continue with the inflation status judgment step. Inflation status judgment steps: Detect the pressure inside the gas cylinder and compare it with the second threshold. Based on the comparison result, select either a slow inflation step or a fast inflation step to start; when the pressure inside the gas cylinder is less than the second threshold, the fast inflation step is performed, and when the pressure inside the gas cylinder is greater than the second threshold, the slow inflation step is performed. Rapid air inflation procedure: Connect the power supply to the electromagnetic clutch device connected to the high-speed belt pulley. The high-speed belt pulley transmits the engine power to the crankshaft, which rotates rapidly to drive the air compressor to inflate the air quickly. Slow air pumping procedure: Connect the power supply to the electromagnetic clutch device connected to the low-speed ratio pulley. The engine power is transmitted to the crankshaft through the low-speed ratio pulley. The crankshaft rotates slowly to drive the air compressor to pump air slowly. Steps to prevent air from being pumped: Disconnect the power supply to the electromagnetic clutch device, all pulleys will spin freely on the bearings, the crankshaft power will be interrupted, and the air compressor will not pump air; The first threshold includes a first transition threshold for transitioning from the inflation state to the gas usage state and a second transition threshold for transitioning from the gas usage state to the inflation state, wherein the first transition threshold is greater than the second transition threshold.

2. The control method for a multi-speed air compressor with clutch according to claim 1, characterized in that, The electromagnetic clutch device includes: The transmission assembly includes a suction disc and a transmission disc connected by a spring plate, the transmission disc being fixed to the crankshaft; An electromagnet core is disposed in the inner cavity of the pulley and has a coil embedded thereon. When energized, it can attract the suction plate to drive the transmission plate and crankshaft to rotate.

3. The control method for a multi-speed air compressor with clutch according to claim 2, characterized in that, The pulley has an annular groove on the side opposite to the electromagnetic clutch device, and the electromagnet core is located in the cavity formed by the annular groove.

4. The control method for a multi-speed air compressor with clutch according to claim 1, characterized in that, The pulley is made of magnetic material.

5. The control method for a multi-speed air compressor with clutch according to claim 4, characterized in that, The pulley is made of iron.

6. The control method for a multi-speed air compressor with clutch according to claim 3, characterized in that, The number of pulleys and the number of electromagnetic clutch devices are both two, and the opening direction of the annular grooves of the two pulleys is the same.

7. The control method for a multi-speed air compressor with clutch according to claim 2, characterized in that, The transmission disc is fixedly connected to the crankshaft via a connecting key.

8. The control method for a multi-speed air compressor with clutch according to claim 1, characterized in that, The first transition threshold is 12 bar, and the second transition threshold is 10 bar.

9. A vehicle, characterized in that, The clutch multi-speed ratio air compressor control method described in any one of claims 1-8 is adopted.

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