An interconnected control device for independent suspension of electric vehicles with variable stiffness

Abstract

The present invention discloses an interconnected control device for an independent suspension of an electric vehicle with variable stiffness. The device comprises a vehicle frame, four groups of interconnected air pressure control circuits and four independent air suspensions. The vehicle frame is used to support the entire interconnected assembly, the four independent air suspensions are used to achieve variable suspension stiffness, and the interconnected hydraulic control circuits are used to achieve variable and interconnected air spring stiffness. When the suspension on one side is raised by the impact of the ground, the air suspension spring on that side is depressurized and lowered, and the air springs on the other three sides are pressurized to raise the suspension. This ensures the balance and stability of the entire vehicle body when the vehicle is traveling on an uneven road surface. The present invention is suitable for electric vehicles driven by wheel hub motors, and can achieve vehicle body stability control, thereby improving the ride comfort and driving stability of the entire vehicle.

Description

Technical Field

[0001] The present invention belongs to the field of new energy electric vehicles driven by wheel hub motors, and in particular relates to an electric vehicle independent suspension interconnection control device with variable stiffness. Background Art

[0002] In order to solve the problem of poor vehicle body stability and ride comfort caused by uneven impact load on each wheel of the ground during driving, people have proposed a four-wheel independent air spring suspension. Although this structure can prevent the impact load on each wheel of the vehicle during driving from affecting the vibration of the other three suspensions, this structure can only achieve vehicle stability control when the ground impact load is not large. When the impact is too large, it will also cause vehicle body vibration, resulting in uneven load on each wheel, thus affecting vehicle body stability and ride comfort. Summary of the invention

[0003] In view of this situation, the present invention provides an interconnected control device for an independent suspension of an electric vehicle with variable stiffness. The ground impact load on the wheel on one side can relieve the pressure of the air spring on that side and lower the height, while the air springs on the other three sides can increase the pressure and raise the suspension height, thereby maintaining the balance of the vehicle body and improving the driving stability of the vehicle.

[0004] In order to achieve the above object, the present invention adopts the following scheme:

[0005] A variable stiffness electric vehicle independent suspension interconnection control device includes a vehicle frame, 4 groups of interconnected air pressure control circuits and 4 independent air suspensions. The vehicle frame includes 6 1A rods, 10 1B rods, 10 1C rods, 4 1D rods, 4 1E rods, 5 1F rods and other 6 different lengths of frame rods; the interconnected air pressure control circuit includes an interconnected air pressure control circuit bottom plate, an air storage tank, an air storage tank air hole, a conduit, an air hole joint, a pressure relief valve, a one-way valve, a conduit bracket bottom plate, and 4 conduit brackets; the independent air suspension includes wheels, suspension connectors, a lower swing arm, an upper swing arm, and an air spring; the 4 groups of interconnected air pressure control circuits are connected to the vehicle frame through the interconnected air pressure control circuit bottom plate, and the 4 independent air suspensions are connected to the interconnected air pressure control circuit through the air spring pneumatic cylinder air hole.

[0006] In the above technical scheme, the frame is arranged in three layers: upper, middle and lower, with two A rods on each layer; the upper layer is fixed by welding the two left and right A rods through two front and rear D rods, the two A rods on the middle layer are fixed by welding the two front and rear E rods, and the two A rods on the lower layer are fixed by welding the two front and rear F rods; the upper and middle layers are fixed by welding five B rods on the left and right, and the middle and lower layers are fixed by welding five C rods on the left and right; the left and right A rods of each layer are horizontally in the same plane, but not in the same plane in the vertical direction. When viewed from the front and rear direction of the frame, the frame presents two inverted and overlapping trapezoids, and the lower base of the upper trapezoid coincides with the upper base of the lower trapezoid.

[0007] In the above technical solution, the four groups of interconnected air pressure control circuits have the same structure and are symmetrically arranged front to back and left to right on the bottom plate of the interconnected air pressure control circuit; the bottom plate of the interconnected air pressure control circuit is connected to the frame A by welding.

[0008] In the above technical scheme, the air storage tank and the conduit bracket bottom plate in the interconnected air pressure control circuit are connected to the interconnected air pressure control circuit bottom plate through bolts; the air storage tank is connected to the conduit A through the air storage tank air hole, and the conduit A is respectively connected to the conduit C connected to the pressure relief valve and the conduit B connected to the one-way valve through the air hole joint A; the pressure relief valve connecting conduit E and the one-way valve connecting conduit D are connected to the air hole joint B; the air hole joint B is then connected to the conduit F and is connected to the air spring through the air hole of the pneumatic cylinder.

[0009] In the above technical solution, the air spring in the independent air suspension is connected to the conduit in the interconnected air pressure control circuit through the air hole of the pneumatic cylinder, the upper end of the air spring is connected to the C section of the upper frame A, and the lower end is connected to the lower swing arm; one end of the lower swing arm is connected to the A section of the lower frame A, and the other end is connected to the suspension connector; one section of the upper swing arm is connected to the B section of the middle frame A, and the other end is connected to the suspension connector; the suspension connector connects the upper swing arm, the lower swing arm and the wheel. The four independent air suspensions have the same structure and are symmetrically distributed on the frame in front and back and left and right directions.

[0010] The present invention can achieve the following beneficial effects through the above technical solution:

[0011] (1) The variable stiffness independent suspension interconnection device of the present invention can automatically coordinate and control the adjustment of the stiffness of the independent suspension on each side, thereby adjusting the corresponding suspension height to maintain the balance of the vehicle body.

[0012] (2) The present invention uses an air spring and an air pressure circuit, which is beneficial to reducing the sprung mass of an electric vehicle driven by a wheel hub motor, thereby improving the driving stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of the present invention.

[0014] Figure 2It is a front view of the present invention.

[0015] Figure 3 It is a structural diagram of the frame of the present invention.

[0016] The reference numerals in the accompanying drawings are as follows: 1-vehicle frame; 2-interconnected air pressure control circuit bottom plate; 3-air storage tank; 4-air storage tank air hole; 5-conduit; 6-air hole joint; 7-pressure relief valve; 8-check valve; 9-conduit bracket bottom plate; 10-conduit bracket; 11-wheel; 12-suspension connecting part; 13-lower swing arm; 14-air cylinder air hole; 15-air spring; 16-upper swing arm; A-lower swing arm connecting end; B-upper swing arm connecting end; C-air spring connecting end. DETAILED DESCRIPTION

[0017] The device is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0018] like Figure 1 As shown, a variable stiffness independent suspension interconnection device of the present invention comprises a vehicle frame, four sets of interconnected air pressure control circuits and four independent air suspensions. The four sets of interconnected air pressure control circuits and the four independent air suspensions are symmetrically connected to the vehicle frame front and back and left and right.

[0019] The frame is as Figure 2 As shown, it is composed of 6 frame rods of different lengths, namely 6 1A rods, 10 1B rods, 10 1C rods, 4 1D rods, 4 1E rods, and 5 1F rods, which are welded together; the 6 1A frame rods are divided into three layers: upper, middle, and lower, with two 1A rods in each layer; the upper layer is fixed by welding the two left and right 1A rods through the two front and rear 1D rods, the two 1A rods in the middle layer are fixed by welding the two front and rear 1E rods, and the two 1A rods in the lower layer are fixed by welding the two front and rear 1F rods; the upper and middle layers are fixed by welding 5 1B rods on the left and right, and the middle and lower layers are fixed by welding 5 1C rods on the left and right; the two 1A rods on the left and right of each layer are in the same plane horizontally, but not in the same plane vertically. Viewed from the front and rear direction of the frame, the frame presents two inverted and overlapping trapezoids, and the lower base of the upper trapezoid coincides with the upper base of the lower trapezoid.

[0020] The interconnected air pressure control circuit includes an interconnected air pressure control circuit base plate 2, an air storage tank 3, an air storage tank air hole 4, a conduit 5, an air hole joint 6, a pressure relief valve 7, a one-way valve 8, a conduit bracket base plate 9, and four conduit brackets 10. Figure 1As shown, the gas tank 3 and the conduit bracket bottom plate 9 are connected to the interconnected air pressure control circuit bottom plate 2 by bolts; the gas tank 3 is connected to the conduit 5A through the gas tank air hole 4, and the conduit 5A is respectively connected to the conduit 5C connected to the pressure relief valve 7 and the conduit 5B connected to the check valve 8 through the air hole joint 6A; the pressure relief valve 7 connecting conduit 5E and the check valve 8 connecting conduit 5D are connected to the air hole joint 6B; the air hole joint 6B is then connected to the conduit 5F and connected to the air spring through the air cylinder air hole 14. The four interconnected air pressure control circuits have the same structure and are symmetrically arranged on the interconnected air pressure control circuit bottom plate 2 in front and back and left and right directions; the interconnected air pressure control circuit bottom plate 2 is connected to the frame 1A by welding.

[0021] The independent air suspension includes a wheel 11, a suspension connecting member 12, a lower swing arm 13, an upper swing arm 16, and an air spring 15. Figure 3 and Figure 1 As shown, the air spring 15 is connected to the conduit 5F in the interconnected air pressure control circuit through the air hole 14 of the air cylinder. The upper end of the air spring 15 is connected to the C section of the upper frame 1A, and the lower end is connected to the lower swing arm 13; one section of the lower swing arm 13 is connected to the A section of the lower frame 1A, and the other end is connected to the suspension connector 12; one section of the upper swing arm is connected to the B section of the middle frame 1A, and the other end is connected to the suspension connector 13; the upper end of the suspension connector 12 is hingedly connected to the bottom end of the upper swing arm 16, and the lower end is hingedly connected to the bottom end of the lower swing arm 13, and a through hole is opened in the middle to connect to the wheel hub of the wheel 11 through a thread. The four independent air suspensions have the same structure and are symmetrically distributed on the frame 1 in front and back and left and right directions.

[0022] The invention discloses an interconnected control device for an independent suspension of an electric vehicle with variable stiffness, and the working process is as follows: when a wheel 11 on one side is lifted by a ground impact load, the air pressure of the pressure relief valve 7 reaches a predetermined threshold value and opens, so that the gas flows from the air spring 15 through the air cylinder air hole 14, the conduit 5F, the air hole joint 6B, the conduit 5E, the pressure relief valve 7, the conduit 5C, the air hole joint 6A, the conduit 5A, and the air tank air hole 4 into the air storage tank 3, and the air pressure in the air storage tank 3 increases, thereby opening the one-way valve 8 of the remaining three air pressure circuits, and the gas flows from the air storage tank 3 through the air tank air hole 4, the conduit 5A, the air hole joint 6A, the conduit 5C, the pressure relief valve 7, the conduit 5E, the air hole joint 6B, the conduit 5F, and the air cylinder air hole 14 of the remaining three air pressure circuits into the air springs 15 of the remaining three independent air suspensions, so that the air suspension on the side impacted by the load is lowered and the air suspensions on the remaining three sides are raised to maintain the balance of the vehicle body.

[0023] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A variable stiffness electric vehicle independent suspension interconnection control device, comprising a vehicle frame, a plurality of interconnected air pressure control circuits and a plurality of independent air suspensions, characterized in that: A plurality of groups of interconnected air pressure control circuits have the same structure and are symmetrically arranged on the interconnected air pressure control circuit bottom plate in the front and rear and in the left and right directions; a plurality of independent air suspension structures also have the same structure and are symmetrically distributed on the front and rear and in the left and right directions of the vehicle frame; the vehicle frame comprises a plurality of 1A rods, a plurality of 1B rods, a plurality of 1C rods, a plurality of 1D rods, a plurality of 1E rods, and a plurality of 1F rods, each rod forming an integral body; the interconnected air pressure control circuit comprises an interconnected air pressure control circuit bottom plate (2), an air storage tank (3), an air storage tank air hole (4), a conduit (5), an air A hole joint (6), a pressure relief valve (7), a one-way valve (8), a conduit bracket base plate (9), and a plurality of conduit brackets (10); the independent air suspension comprises a wheel (11), a suspension connector (12), a lower swing arm (13), an upper swing arm (16), and an air spring (15); the plurality of groups of interconnected air pressure control circuits are connected to the vehicle frame (1) via the interconnected air pressure control circuit base plate (2), and the plurality of independent air suspensions are connected to the conduit 5F of the interconnected air pressure control circuit via the air spring air cylinder air hole (14); The frame is arranged in three layers: upper, middle and lower, with two 1A rods on each layer; the upper layer is fixed by welding the two 1A rods on the left and right through two 1D rods on the front and rear, the two 1A rods on the middle layer are fixed by welding the two 1E rods on the front and rear, and the two 1A rods on the lower layer are fixed by welding the two 1F rods on the front and rear; the upper and middle layers are fixed by welding five 1B rods on the left and right, and the middle and lower layers are fixed by welding five 1C rods on the left and right; The gas storage tank (3) and the conduit support base plate (9) in the interconnected gas pressure control circuit are connected to the interconnected gas pressure control circuit base plate (2) through bolts; the gas storage tank (3) is connected to the conduit 5A through the gas storage tank air hole (4); the conduit 5A is respectively connected to the conduit 5C connected to the pressure relief valve (7) and the conduit 5B connected to the one-way valve (8) through the air hole joint 6A; the pressure relief valve (7) connecting conduit 5E and the one-way valve (8) connecting conduit 5D are connected to the air hole joint 6B; the air hole joint 6B is further connected to the conduit 5F and is connected to the air spring (15) through the air hole (14) of the pneumatic cylinder; The air spring (15) in the independent air suspension is connected to the conduit (5) in the interconnected air pressure control circuit through the air hole (14) of the air cylinder; the upper end of the air spring (15) is connected to the C section of the upper frame 1A, and the lower end is connected to the lower swing arm (13); one section of the lower swing arm (13) is connected to the A section of the lower frame 1A, and the other end is connected to the suspension connecting member (12); one section of the upper swing arm (16) is connected to the B section of the middle frame 1A, and the other end is connected to the suspension connecting member (12).

2. The electric vehicle independent suspension interconnection control device with variable stiffness according to claim 1, characterized in that: The upper, middle and lower layers of the frame (1) have two 1A rods on the left and right sides that are horizontally in the same plane, but are not vertically in the same plane. When viewed from the front and rear directions of the frame, the frame presents two inverted and overlapping trapezoids, with the lower base of the upper trapezoid coinciding with the upper base of the lower trapezoid.

3. The electric vehicle independent suspension interconnection control device with variable stiffness according to claim 1, characterized in that: The upper end of the suspension connecting member (12) is hingedly connected to the bottom end of the upper swing arm (16), and the lower end is hingedly connected to the bottom end of the lower swing arm (13). A through hole is provided in the middle and is connected to the hub of the wheel (11) via a thread.

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