Vehicle air suspension system and vehicle

Abstract

The invention discloses a vehicle air suspension system and a vehicle, the vehicle comprises a power battery, and the system comprises at least one air suspension device; the air compressor is connected with at least one air suspension device; the vehicle-mounted charger is connected with the power battery and the air compressor and used for converting direct current provided by the power battery into alternating current to supply power to the air compressor in the first working mode, so that the air compressor outputs compressed air to drive at least one air suspension device. According to the suspension system, the power battery is adopted for high-voltage power supply, the vehicle-mounted charger is reused for supplying power to the air compressor to drive the multiple air suspension devices, driving current can be reduced, loss is reduced, heating is not prone to occurring, the diameter of a distribution wire harness can be reduced, one set of high-voltage control driver can be reduced, and cost is reduced. The cost and the size can be remarkably reduced, and the supporting and damping effects of the vehicle can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle air suspension system and a vehicle. Background Art

[0002] With the development of intelligent chassis of new energy electric vehicles, the height of wire-controlled suspension can be adjusted to reduce the wind resistance of the whole vehicle and obtain better endurance and comfort. The application of air suspension system is becoming more and more extensive.

[0003] In the related technology, the air suspension system air supply system is often a low-voltage (12V / 48V) power supply design, the air compressor power is relatively small, generally 200~400W, the driving current is relatively large, it is easy to overheat when working for a long time in off-road conditions, and the air compression displacement is small, and the vehicle support and shock absorption effects are poor. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose a vehicle air suspension system, which uses a power battery for high-voltage power supply, and reuses the on-board charger to power the air compressor to drive multiple air suspension devices, and the driving current is reduced to a few tenths of the low-voltage power supply, reducing losses and not easy to heat up, thereby solving the problem of low-voltage power supply power being too small and high losses, and can reduce the diameter of the distribution harness, and can reduce a set of high-voltage control drivers, which can significantly reduce costs and volume, and can improve the support and shock absorption effects of the vehicle.

[0005] A second object of the present invention is to provide a vehicle.

[0006] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a vehicle air suspension system, wherein the vehicle includes a power battery, and the system includes: at least one air suspension device; an air compressor, wherein the air compressor is connected to the at least one air suspension device; and an on-board charger, wherein the on-board charger is respectively connected to the power battery and the air compressor, and is used for, in a first working mode, converting the direct current provided by the power battery into alternating current to power the air compressor, so that the air compressor outputs compressed air to drive the at least one air suspension device.

[0007] According to the vehicle air suspension system of an embodiment of the present invention, in the first working mode, the on-board charger converts the DC power provided by the power battery into AC power to power the air compressor, so that the air compressor outputs compressed air to drive at least one air suspension device. As a result, the system uses the power battery for high-voltage power supply, and reuses the on-board charger to power the air compressor to drive multiple air suspension devices, and the driving current is reduced to a few tenths of the low-voltage power supply, reducing losses and not easy to heat up, thereby solving the problem of low-voltage power supply power being too small and high losses, and can reduce the diameter of the distribution harness, and can reduce a set of high-voltage control drivers, which can significantly reduce costs and volume, and can improve the support and shock absorption effects of the vehicle.

[0008] In addition, the vehicle air suspension system according to the above embodiment of the present invention may also have the following additional technical features:

[0009] According to one embodiment of the present invention, the on-board charger is further adapted to be connected to an external power source, and is used to charge the power battery based on the electric energy provided by the external power source in the second working mode.

[0010] According to one embodiment of the present invention, the on-board charger includes: a PFC (Power Factor Correction Circuit) circuit, which is respectively connected to the air compressor and the external power supply; a DCDC (Direct Current to Direct Current) conversion circuit, which is respectively connected to the PFC circuit and the power battery; wherein, by controlling the PFC circuit and the DCDC conversion circuit, in the first working mode, the DC power provided by the power battery is converted into AC power to power the air compressor, or in the second working mode, the power battery is charged based on the electric energy provided by the external power supply.

[0011] According to one embodiment of the present invention, the PFC circuit includes multiple bridge arms and multiple PFC inductors, the two ends of each bridge arm are respectively connected to the DCDC conversion circuit, the midpoint of each bridge arm is respectively connected to one phase winding of the multi-phase winding of the air compressor, and the midpoints of at least some of the bridge arms are also connected to the PFC inductor; wherein each bridge arm includes an upper bridge switch tube and a lower bridge switch tube connected in series, and the two ends of the series connection serve as the two ends of the corresponding bridge arm, and the connection point of the series connection serves as the midpoint of the corresponding bridge arm.

[0012] According to one embodiment of the present invention, the PFC circuit includes three bridge arms and two PFC inductors, one end of each of the two PFC inductors is respectively connected to the midpoint of one of the three bridge arms, the other end of each of the two PFC inductors is respectively connected to the first end of the external power supply, and the midpoint of the bridge arm not connected to the PFC inductor is connected to the second end of the external power supply.

[0013] According to one embodiment of the present invention, the PFC circuit includes three bridge arms and three PFC inductors, one end of each of the three PFC inductors is respectively connected to the midpoint of one of the three bridge arms, and the other end of each of the three PFC inductors is respectively connected to one end of the external power supply.

[0014] According to one embodiment of the present invention, the DCDC conversion circuit includes an LLC (Inductor-Inductor-Capacitor) resonant circuit or a CLLC (Capacitor-Inductor-Capacitor-Inductor) resonant circuit.

[0015] According to one embodiment of the present invention, the suspension system also includes: a first switching circuit, arranged between the multiple bridge arms and the multiple PFC inductors; and / or, a second switching circuit, arranged between the multiple bridge arms and the multi-phase windings of the air compressor; wherein, in the first operating mode, the first switching circuit is in an open state and the second switching circuit is in a closed state, so that the multiple bridge arms are connected to the multi-phase windings of the air compressor; in the second operating mode, the first switching circuit is in a closed state and the second switching circuit is in an open state, so that the external power supply is connected to the multiple bridge arms.

[0016] According to one embodiment of the present invention, the suspension system further comprises: an air distribution device, which is respectively connected to the air compressor and the at least one air suspension device, and is used to distribute the compressed air to the at least one air suspension device.

[0017] To achieve the above-mentioned object, a second embodiment of the present invention provides a vehicle, comprising the above-mentioned vehicle air suspension system.

[0018] According to the vehicle of the embodiment of the present invention, through the above-mentioned vehicle air suspension system, a power battery is used for high-voltage power supply, and the on-board charger is reused to power the air compressor to drive multiple air suspension devices. The driving current is reduced to a few tenths of the low-voltage power supply, which reduces losses and is not easy to generate heat, thereby solving the problems of too small power and high losses of the low-voltage power supply, and can reduce the diameter of the distribution harness, and can reduce a set of high-voltage control drivers, which can significantly reduce costs and volume, and can improve the support and shock absorption effects of the vehicle.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a block diagram of a vehicle air suspension system according to an embodiment of the present invention;

[0021] Figure 2 is a block diagram of a vehicle air suspension system according to an embodiment of the present invention;

[0022] Figure 3 A hardware topology diagram of a vehicle air suspension system according to an embodiment of the present invention;

[0023] Figure 4 A hardware topology diagram of a vehicle air suspension system according to another embodiment of the present invention;

[0024] Figure 5 A hardware topology diagram of a vehicle air suspension system according to an embodiment of the present invention;

[0025] Figure 6 A hardware topology diagram of a vehicle air suspension system according to another embodiment of the present invention;

[0026] Figure 7 is a block diagram of a vehicle air suspension system according to an embodiment of the present invention;

[0027] Figure 8 FIG. 4 is a block diagram of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The vehicle air suspension system and the vehicle according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] Figure 1 FIG. 4 is a block diagram of a vehicle air suspension system according to an embodiment of the present invention.

[0031] like Figure 1 As shown, a vehicle air suspension system 100 according to an embodiment of the present invention, the vehicle includes a power battery, and the vehicle air suspension system 100 may include: an air compressor 110, an on-board charger 120 and at least one air suspension device 130.

[0032] Among them, the air compressor 110 is connected to at least one air suspension device 130, and the on-board charger 120 is respectively connected to the power battery and the air compressor 110, and is used to convert the DC power provided by the power battery into AC power to power the air compressor 110 in the first working mode, so that the air compressor 110 outputs compressed air to drive at least one air suspension device 130.

[0033] Specifically, in the first working mode, the on-board charger 120 converts the direct current provided by the power battery into alternating current to power the air compressor 110. The air compressor 110 inhales air and compresses it into high-pressure gas. The high-pressure gas is transmitted from the air compressor 110 to at least one air suspension device 130 through a pipeline, driving the suspension device to provide the support and shock absorption functions required by the vehicle.

[0034] Compared with the conventional 12V power supply, the vehicle air suspension system 100 of the embodiment of the present invention creatively integrates the air compressor 110 and the on-board charger 120, and the on-board charger 120 functions to drive the air compressor. Since high voltage (400V or 800V) is used for power supply, the power supply current is reduced to a few tenths of that of the 12V power supply, which reduces losses and is not easy to generate heat, and reduces the diameter of the distribution harness; and the air compressor 110 in the present invention has greater power, and the displacement response of air compression is greatly improved.

[0035] According to one embodiment of the present invention, Figure 2 As shown, the on-board charger 120 is also suitable for being connected to an external power source, and is used to charge the power battery based on the electric energy provided by the external power source in the second working mode.

[0036] That is, in the second working mode, the external power source is connected to the onboard charger 120 via a charging gun, and the onboard charger 120 converts the electric energy provided by the external power source into direct current to charge the power battery. The electric energy provided by the external power source may be low-voltage alternating current.

[0037] According to one embodiment of the present invention, Figure 3As shown, the on-board charger 120 includes: a PFC circuit 121, which is respectively connected to the air compressor 110 and the external power supply; a DCDC conversion circuit 122, which is respectively connected to the PFC circuit 121 and the power battery; wherein, by controlling the PFC circuit 121 and the DCDC conversion circuit 122, in a first working mode, the direct current provided by the power battery is converted into alternating current to power the air compressor 110, or in a second working mode, the power battery is charged based on the electric energy provided by the external power supply.

[0038] Specifically, in the first working mode, the power battery outputs direct current to the DCDC conversion circuit 122, and the DCDC conversion circuit 122 performs DCDC conversion on the direct current provided by the power battery, converts it into direct current with voltage and current levels suitable for the operation of the PFC circuit 121, and outputs it to the PFC circuit 121. The PFC circuit 121 is multiplexed as an inverter, and performs DCAC (Direct Current to Alternating Current) conversion on the direct current provided by the DCDC conversion circuit 122, and converts it into alternating current to power the air compressor 110. Therefore, thanks to the voltage stabilization effect of the DCDC conversion circuit 122, the power supply voltage of the air compressor 110 is not affected by the SOC (State of Charge) of the power battery, and the air compressor 110 can always operate in the high efficiency area.

[0039] In the second working mode, the PFC circuit 121 can convert the electric energy provided by the external power supply, that is, the AC input voltage, into a DC voltage, provide a stable DC power supply for the subsequent DCDC conversion circuit 122, and adjust the AC input voltage at the same time, adjust the phase and magnitude of the input current to synchronize it with the input voltage, realize the sinusoidal waveform of the current, reduce harmonic distortion, and improve the overall power factor of the system, and reduce invalid reactive power. The DCDC conversion circuit 122 can convert the DC voltage output by the PFC circuit 121 into a voltage and current level suitable for charging the power battery to charge the power battery, and can adjust the working mode of the DCDC conversion circuit 122 according to the charging state of the power battery and external conditions, such as constant current charging (CC, Constant Current Charging), constant voltage charging (CV, Constant Voltage Charging) or a combination of the two.

[0040] According to one embodiment of the present invention, the PFC circuit 121 includes multiple bridge arms and multiple PFC inductors L1, the two ends of each bridge arm are respectively connected to the DCDC conversion circuit 122, the midpoint of each bridge arm is respectively connected to one phase winding of the multi-phase winding of the air compressor 110, and the midpoints of at least some of the bridge arms are also connected to the PFC inductor L1; wherein each bridge arm includes an upper bridge switch tube and a lower bridge switch tube connected in series, and the two ends of the series connection serve as the two ends of the corresponding bridge arm, and the connection point of the series connection serves as the midpoint of the corresponding bridge arm.

[0041] That is to say, the number of bridge arms of the PFC circuit 121 corresponds to the number of windings of the air compressor 110. When the winding of the air compressor 110 is a three-phase winding, the PFC circuit 121 includes three bridge arms; when the winding of the air compressor 110 is a six-phase winding, the PFC circuit 121 includes six bridge arms.

[0042] According to one embodiment of the present invention, Figure 3 As shown, the PFC circuit 121 includes three bridge arms and two PFC inductors L1, one end of each of the two PFC inductors L1 is respectively connected to the midpoint of one of the three bridge arms, the other end of each of the two PFC inductors L1 is respectively connected to the first end of the external power supply, and the midpoint of the bridge arm not connected to the PFC inductor L1 is connected to the second end of the external power supply.

[0043] Specifically, if Figure 3 As shown, when the on-board charger 120 is a single-phase charger, the PFC circuit 121 includes three bridge arms and two PFC inductors L1, one end of each of the two PFC inductors L1 is respectively connected to the midpoint of the first bridge arm and the second bridge arm, the other end of each of the two PFC inductors L1 is respectively connected to the first end of the external power supply, and the second end of the external power supply is connected to the midpoint of the third bridge arm, wherein the first bridge arm includes switch tubes M1 and M2 connected in series, the second bridge arm includes switch tubes M3 and M4 connected in series, and the third bridge arm includes switch tubes M5 and M6 connected in series.

[0044] Furthermore, the DCDC conversion circuit 122 includes a primary switching circuit, a voltage conversion circuit and a secondary switching circuit. The primary switching circuit is respectively connected to the PFC circuit 121 and the primary side of the voltage conversion circuit, and the secondary switching circuit is respectively connected to the secondary side of the voltage conversion circuit and the power battery. Among them, the primary switch circuit includes switch tubes M7, M8, M9 and M10, the secondary switch circuit includes switch tubes M11, M12, M13 and M14, and the voltage conversion circuit includes: a first resonant inductor L2, a first resonant capacitor C2, a first transformer T1, a second resonant inductor L3 and a second resonant capacitor C3, the first resonant inductor L2 is connected in series between the first output end of the primary switch circuit and one end of the primary winding of the first transformer T1, the first resonant capacitor C2 is connected in series between the second output end of the primary switch circuit and the other end of the primary winding of the first transformer T1, the second resonant inductor L3 is connected in series between the first input end of the secondary switch circuit and one end of the secondary winding of the first transformer T1, and the second resonant capacitor C3 is connected in series between the second input end of the secondary switch circuit and one end of the secondary winding of the first transformer T1.

[0045] In the first working mode, the power battery outputs direct current to the DCDC conversion circuit 122, and the output current is regulated by adjusting the switching frequency of the switch tubes M11-M14 of the secondary switch circuit. The electric energy is transmitted to the primary switch circuit through the second resonant inductor L3, the second resonant capacitor C3, the first transformer T1, the first resonant inductor L2 and the first resonant capacitor C2. The switch tubes M7-M10 of the primary switch circuit are used as rectifier output tubes to rectify the electric energy, convert the electric energy into direct current with a voltage and current level suitable for the operation of the PFC circuit 121 and output it to the PFC circuit 121. By adjusting the switching frequency of the switch tubes M1-M6 of the three bridge arms of the PFC circuit 121, the direct current is inverted to DCAC and converted into alternating current to power the air compressor 110.

[0046] In the second working mode, the PFC circuit 121 is an interleaved parallel totem pole PFC circuit 121, and the AC power provided by the external power supply is converted into ACDC (Alternating Current to Direct Current) by the switch tubes M1-M6 of the three bridge arms of the PFC circuit 121, and the input AC power is converted into DC power, and the power factor is improved by the PFC inductor L1. After filtering by the first capacitor C1, the DC power is output to the DCDC conversion circuit, and the input and output currents are regulated by adjusting the switching frequency of the switch tubes M7-M10 of the primary switching circuit. The electric energy is transmitted to the secondary switching circuit through the first resonant inductor L2, the first resonant capacitor C2, the first transformer T1, the second resonant inductor L3 and the second resonant capacitor C3. The switch tubes M11-M14 of the secondary switching circuit are output rectifier tubes, which are rectified and filtered by the fourth capacitor C4 to charge the power battery.

[0047] According to another embodiment of the present invention, Figure 4 As shown, the PFC circuit 121 includes three bridge arms and three PFC inductors L1, one end of each of the three PFC inductors L1 is respectively connected to the midpoint of one of the three bridge arms, and the other end of each of the three PFC inductors L1 is respectively connected to one end of the external power supply.

[0048] Specifically, if Figure 4 As shown, when the on-board charger 120 is a three-phase charger, the PFC circuit 121 includes three bridge arms and three PFC inductors L1, and one end of each PFC inductor L1 is respectively connected to the midpoint of one of the three bridge arms, and the other end of each of the three PFC inductors L1 is respectively connected to each end of the three-phase external power supply. The specific structure of the three bridge arms of the PFC circuit 121 and the DCDC conversion circuit 122, as well as the corresponding working principle, can be found in Figure 3 The description of the corresponding embodiments will not be repeated here.

[0049] According to an embodiment of the present invention, the DCDC conversion circuit 122 includes an LLC resonant circuit or a CLLC resonant circuit. Figure 3 and Figure 4 The DCDC conversion circuit 122 in FIG. 1 includes a CLLC resonant circuit. It should be understood that Figure 3 and Figure 4 Replacing the CLLC resonant circuit with an LLC resonant circuit can also achieve Figure 3 and Figure 4 The functions that can be achieved by the DCDC conversion circuit 122 in.

[0050] In some embodiments, the suspension system 100 further includes: a first switch circuit 140, which is provided between the plurality of bridge arms and the plurality of PFC inductors L1; and / or a second switch circuit 150, which is provided between the plurality of bridge arms and the multi-phase windings of the air compressor 110; wherein, in the first working mode, the first switch circuit 140 is in an open state and the second switch circuit 150 is in a closed state, so that the plurality of bridge arms are connected to the multi-phase windings of the air compressor 110; in the second working mode, the first switch circuit 140 is in a closed state and the second switch circuit 150 is in an open state, so that the external power supply is connected to the plurality of bridge arms. At this time, the first switch circuit 140 includes switches S1, S2 and S3, and the second switch circuit 150 includes switches S4, S5 and S6.

[0051] In one embodiment of the present invention, Figure 5As shown, when the on-board charger 120 is a single-phase charger, the PFC circuit 121 includes three bridge arms and two PFC inductors L1, one end of S1 is connected to the midpoint of the first bridge arm, the other end of S1 is connected to one end of a PFC inductor L1, one end of S2 is connected to the midpoint of the second bridge arm, the other end of S2 is connected to one end of another PFC inductor L1, the other end of each of the two PFC inductors L1 is respectively connected to the first end of the external power supply, one end of S3 is connected to the midpoint of the third bridge arm, and the other end of S3 is connected to the second end of the external power supply; one end of S4, S5 and S6 is respectively connected to the three-phase windings of the compressor, the other end of S4 is connected to the midpoint of the first bridge arm, the other end of S5 is connected to the midpoint of the second bridge arm, and the other end of S6 is connected to the midpoint of the third bridge arm. In the first working mode, S1, S2 and S3 are opened, S4, S5 and S6 are closed, the three bridge arms of the PFC circuit 121 are connected to the three-phase winding of the air compressor 110, the power battery outputs direct current to the DCDC conversion circuit 122, and the output current is adjusted by adjusting the switching frequency of the switch tubes M11-M14 of the secondary switch circuit. The electric energy is transferred to the primary switch circuit through the second resonant inductor L3, the second resonant capacitor C3, the first transformer T1, the first resonant inductor L2 and the first resonant capacitor C2. The switch tubes M7-M10 of the primary switch circuit are used as rectifier output tubes for rectification, and the electric energy is converted into direct current with a voltage and current level suitable for the operation of the PFC circuit 121 and output to the PFC circuit 121. By adjusting the switching frequency of the switch tubes M1-M6 of the three bridge arms of the PFC circuit 121, the direct current is inverted to DCAC and converted into alternating current to power the air compressor 110. In the second working mode, S1, S2 and S3 are closed, S4, S5 and S6 are opened, the external power supply is connected to the three bridge arms of the PFC circuit 121, the PFC circuit 121 is an interlaced parallel totem pole PFC circuit 121, the AC power provided by the external power supply is converted into DC power by the switch tubes M1-M6 of the three bridge arms of the PFC circuit 121, the input AC power is converted into DC power, and the power factor is improved by the PFC inductor L1, and after filtering by the first capacitor C1, the DC power is output to the DCDC conversion circuit, and the input and output currents are regulated by adjusting the switching frequency of the switch tubes M7-M10 of the primary switch circuit, and the electric energy is transferred to the secondary switch circuit through the first resonant inductor L2, the first resonant capacitor C2, the first transformer T1, the second resonant inductor L3 and the second resonant capacitor C3. The switch tubes M11-M14 of the secondary switch circuit are output rectifier tubes, which are rectified and filtered by the fourth capacitor C4 to charge the power battery.

[0052] In another embodiment of the present invention, Figure 6As shown, when the on-board charger 120 is a three-phase charger, the PFC circuit 121 includes three bridge arms and three PFC inductors L1, one end of S1 is connected to the midpoint of the first bridge arm, one end of S2 is connected to the midpoint of the second bridge arm, the other end of each of the two PFC inductors L1 is respectively connected to the first end of the external power supply, one end of S3 is connected to the midpoint of the third bridge arm, the other end of S1, the other end of S2, and the other end of S3 are respectively connected to one end of each of the three PFC inductors L1, and the other end of each of the three PFC inductors L1 is respectively connected to each end of the three-phase external power supply; one end of S4, S5 and S6 is respectively connected to the three-phase windings of the compressor, the other end of S4 is connected to the midpoint of the first bridge arm, the other end of S5 is connected to the midpoint of the second bridge arm, and the other end of S6 is connected to the midpoint of the third bridge arm. In the first working mode, S1, S2 and S3 are opened, S4, S5 and S6 are closed, and the three bridge arms of the PFC circuit 121 are connected to the three-phase winding of the air compressor 110; in the second working mode, S1, S2 and S3 are closed, S4, S5 and S6 are opened, and the external power supply is connected to the three bridge arms of the PFC circuit 121. The working process of this embodiment is shown in FIG. Figure 5 The description of the corresponding embodiments will not be repeated here.

[0053] According to one embodiment of the present invention, Figure 7 As shown, the suspension system 100 further includes an air distribution device 160 , which is respectively connected to the air compressor 110 and the at least one air suspension device 130 , and is used to distribute compressed air to the at least one air suspension device 130 .

[0054] Specifically, in the first working mode, the on-board charger 120 converts the direct current provided by the power battery into alternating current to power the air compressor 110. The air compressor 110 inhales air and compresses it into high-pressure gas. The high-pressure gas is transmitted from the air compressor 110 to the air distribution device 160 through a pipeline, and supplies air to each air suspension device 130 through the air distribution device 160.

[0055] In summary, the vehicle air suspension system according to the embodiment of the present invention can achieve the following beneficial effects:

[0056] (1) The present invention can reduce the load on the low-voltage 12V power supply. By adopting 400V or 800V high-voltage power supply, an air compressor with a power exceeding 1000W can be designed. Due to the higher power, the volume of the high-pressure air storage tank is greatly reduced, and the air suspension adjustment and response performance are improved.

[0057] (2) The present invention can reduce a set of high-voltage control drivers by reusing the on-board charger, which can significantly reduce costs and volume.

[0058] (3) The air compressor can be powered by a DCDC voltage regulator to ensure that the power of the electric massage seat does not drop due to the decrease in the power battery voltage due to the SOC drop, and can maintain operation in the high-efficiency area.

[0059] (4) Furthermore, the on-board charger and the air compressor can be deeply integrated according to the new topology of the present invention to share some components and structural shells, which can further reduce costs and reduce volume.

[0060] In summary, according to the vehicle air suspension system of an embodiment of the present invention, in the first working mode, the on-board charger converts the DC power provided by the power battery into AC power to power the air compressor, so that the air compressor outputs compressed air to drive at least one air suspension device. As a result, the system uses a power battery for high-voltage power supply, and reuses the on-board charger to power the air compressor to drive multiple air suspension devices. The driving current is reduced to a few tenths of the low-voltage power supply, reducing losses and not easy to heat up, thereby solving the problem of low-voltage power supply power being too small and high losses, and can reduce the diameter of the distribution harness, and can reduce a set of high-voltage control drivers, which can significantly reduce costs and volume, and can improve the support and shock absorption effects of the vehicle.

[0061] Corresponding to the above embodiment, the present invention also provides a vehicle.

[0062] Figure 8 FIG. 4 is a block diagram of a vehicle according to an embodiment of the present invention.

[0063] like Figure 8 As shown, a vehicle 200 according to an embodiment of the present invention includes the vehicle air suspension system 100 described above.

[0064] According to the vehicle of the embodiment of the present invention, through the above-mentioned vehicle air suspension system, a power battery is used for high-voltage power supply, and the on-board charger is reused to power the air compressor to drive multiple air suspension devices. The driving current is reduced to a few tenths of the low-voltage power supply, which reduces losses and is not easy to generate heat, thereby solving the problems of too small power and high losses of the low-voltage power supply, and can reduce the diameter of the distribution harness, and can reduce a set of high-voltage control drivers, which can significantly reduce costs and volume, and can improve the support and shock absorption effects of the vehicle.

[0065] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0066] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A vehicle air suspension system, characterized in that: The vehicle includes a power battery, and the system includes: at least one air suspension device; an air compressor connected to the at least one air suspension device; An on-board charger, the on-board charger is respectively connected to the power battery and the air compressor, and is used to, in a first working mode, convert the direct current provided by the power battery into alternating current to power the air compressor, so that the air compressor outputs compressed air to drive the at least one air suspension device.

2. The suspension system according to claim 1, characterized in that: The on-board charger is also suitable for being connected to an external power source, and is used to charge the power battery based on the electric energy provided by the external power source in the second working mode.

3. The suspension system according to claim 2, characterized in that: The on-board charger comprises: A PFC circuit, wherein the PFC circuit is connected to the air compressor and the external power supply respectively; A DCDC conversion circuit, wherein the DCDC conversion circuit is connected to the PFC circuit and the power battery respectively; Among them, by controlling the PFC circuit and the DCDC conversion circuit, in the first working mode, the direct current provided by the power battery is converted into alternating current to power the air compressor, or in the second working mode, the power battery is charged based on the electric energy provided by the external power supply.

4. The suspension system according to claim 3, characterized in that: The PFC circuit includes multiple bridge arms and multiple PFC inductors, the two ends of each bridge arm are respectively connected to the DCDC conversion circuit, the midpoint of each bridge arm is respectively connected to one phase winding of the multi-phase winding of the air compressor, and the midpoints of at least some bridge arms are also connected to the PFC inductor; wherein each bridge arm includes an upper bridge switch tube and a lower bridge switch tube connected in series, and the two ends of the series connection serve as the two ends of the corresponding bridge arm, and the connection point of the series connection serves as the midpoint of the corresponding bridge arm.

5. The suspension system according to claim 4, characterized in that: The PFC circuit includes three bridge arms and two PFC inductors, one end of each of the two PFC inductors is respectively connected to the midpoint of one of the three bridge arms, the other end of each of the two PFC inductors is respectively connected to the first end of the external power supply, and the midpoint of the bridge arm not connected to the PFC inductor is connected to the second end of the external power supply.

6. The suspension system according to claim 4, characterized in that: The PFC circuit includes three bridge arms and three PFC inductors, one end of each of the three PFC inductors is respectively connected to the midpoint of one of the three bridge arms, and the other end of each of the three PFC inductors is respectively connected to one end of the external power supply.

7. The suspension system according to claim 3, characterized in that: The DCDC conversion circuit includes an LLC resonant circuit or a CLLC resonant circuit.

8. The suspension system according to claim 4, characterized in that: The suspension system further comprises: A first switch circuit is provided between the plurality of bridge arms and the plurality of PFC inductors; and / or, A second switch circuit is provided between the plurality of bridge arms and the multi-phase winding of the air compressor; Among them, in the first working mode, the first switch circuit is in an open state and the second switch circuit is in a closed state, so that the multiple bridge arms are connected to the multi-phase winding of the air compressor; in the second working mode, the first switch circuit is in a closed state and the second switch circuit is in an open state, so that the external power supply is connected to the multiple bridge arms.

9. The suspension system according to any one of claims 1 to 8, characterized in that: The suspension system further comprises: An air distribution device is connected to the air compressor and the at least one air suspension device respectively, and is used to distribute the compressed air to the at least one air suspension device.

10. A vehicle, characterized in that: Comprising a vehicle air suspension system according to any one of claims 1-9.

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