Full-active suspension system capable of switching modes

Abstract

The full-active suspension system comprises an active branch and a passive branch which are connected in parallel, one end of the active branch and one end of the passive branch which are connected in parallel are connected with a recovery cavity of a shock absorber assembly, the other end of the active branch and the other end of the passive branch are connected with a compression cavity, and a first electric control switch valve, an electro-hydraulic pump and a second electric control switch valve are sequentially arranged on the active branch. The driving branch is further connected with a first energy accumulator and a second energy accumulator, the first energy accumulator and the second energy accumulator are used for eliminating pressure pulses or providing buffering, and an oil inlet and an oil outlet of the electro-hydraulic pump are connected with the first electric control switch valve and the second electric control switch valve respectively. According to the system, under the working condition that the electro-hydraulic pump fails, the active suspension system is switched into a traditional semi-active electric control suspension by closing the electric control switch valve and the second electric control switch valve, namely, the active branch is closed, the passive branch is still conducted, damping is provided through the CDC electromagnetic valve on the passive branch, and the whole vehicle is prevented from being out of control.

Description

Technical Field

[0001] This invention relates to the field of fully active vehicle suspension technology, and more specifically to a fully active suspension system with switchable modes. Background Technology

[0002] Current state of technology: 1. At present, in the active suspension in CDC mode, the oil in the upper and lower chambers of the shock absorber is adjusted by the CDC solenoid valve to achieve the damping adjustment of the shock absorber. However, the electro-hydraulic pump is still connected to the hydraulic circuit. In order to reduce the leakage of oil from the electro-hydraulic pump port, the electro-hydraulic pump needs to be in torque holding mode at this time. Since the electro-hydraulic pump has mechanical efficiency and volumetric efficiency, there will be some oil leakage. 2. At present, the electro-hydraulic pump mounting bracket of active suspension only serves to support, fix, and isolate vibration; Existing technological shortcomings: 1. Due to the efficiency of the electro-hydraulic pump, maintaining appropriate damping in CDC mode requires the MPU (electro-hydraulic pump) to provide a certain torque and speed, and the electro-hydraulic pump needs to continuously consume energy and generate heat; 2. If the electro-hydraulic pump fails, all the oil will leak from the electro-hydraulic pump port, the CDC solenoid valve will lose its damping adjustment function, causing the shock absorber to fail, and the whole vehicle will be at risk of losing control. 3. At present, the electro-hydraulic pump suspension bracket of the active suspension only serves the functions of support, fixation, and vibration isolation, and has no other functions; Summary of the Invention The technical problem to be solved by this invention is how to provide a fully active suspension system for automobiles that can switch between active mode and CDC mode, and can prevent the whole vehicle from losing control when the electro-hydraulic pump fails.

[0003] This invention solves the above-mentioned technical problems through the following technical means: a switchable mode fully active suspension system, including parallel active and passive branches, one end of which is connected to the recovery chamber of the shock absorber assembly, and the other end is connected to the compression chamber. An electronically controlled switching valve one, an electro-hydraulic pump, and an electronically controlled switching valve two are sequentially arranged on the active branch. An accumulator one and an accumulator two are also connected to the active branch. Accumulator one and accumulator two are used to eliminate pressure pulses or provide buffering. The oil inlet and outlet of the electro-hydraulic pump are respectively connected to electronically controlled switching valve one and electronically controlled switching valve two. Controlling the opening and closing of electronically controlled switching valve one and electronically controlled switching valve two can cause the active branch to be connected to or disconnected from the recovery chamber and compression chamber.

[0004] As a preferred technical solution, the connection end of accumulator one to the active branch is located between the electronically controlled switch valve one and the electro-hydraulic pump, and the connection end of accumulator two to the active branch is located between the electronically controlled switch valve two and accumulator two.

[0005] As a preferred technical solution, the system also includes a bracket, which is fixedly connected to the first electrically controlled switch valve, the electro-hydraulic pump, and the second electrically controlled switch valve. The first electrically controlled switch valve and the second electrically controlled switch valve are located at one end of the bracket, and the electro-hydraulic pump is located at the other end of the bracket.

[0006] As a preferred technical solution, the electro-hydraulic pump is provided with oil port one and oil port two. Oil port one forms an oil inlet or an oil outlet, and oil port two forms an oil outlet or an oil inlet.

[0007] As a preferred technical solution, the recovery chamber is connected to one end of the parallel active branch and passive branch through oil pipe interface one, and the compression chamber is connected to the other end of the parallel active branch and passive branch through oil pipe interface two.

[0008] As a preferred technical solution, the support is provided with oil passage one and oil passage two. The first end of oil passage one is connected to oil pipe interface one, the second end of oil passage one is connected to oil port one, and the third end of oil passage one is connected to accumulator one. The first end of oil passage two is connected to oil pipe interface two, the second end of oil passage two is connected to oil port two, and the third end of oil passage two is connected to accumulator two.

[0009] As a preferred technical solution, the frame includes a support bracket one and a support bracket two, which are fastened together by bolts.

[0010] As a preferred technical solution, the included angle between support one and support two is 0°-180°.

[0011] As a preferred technical solution, accumulator one and accumulator two are each connected to the active branch through an oil pipe.

[0012] As a preferred technical solution, two regulating units and an accumulator three are connected in series on the passive branch. The accumulator three is located between the two regulating units. The regulating unit includes a one-way valve and a solenoid valve connected in parallel. The regulating unit includes regulating unit one and regulating unit two. Regulating unit one includes a one-way valve one and a solenoid valve one connected in parallel. Regulating unit two includes a one-way valve two and a solenoid valve two connected in parallel.

[0013] The beneficial effects of this invention are as follows: (1) In this invention, by controlling the opening and closing of the electronically controlled switch valve one and the electronically controlled switch valve two, the switching between active mode and CDC mode can be realized. When the active suspension is in CDC mode, the electro-hydraulic pump is isolated from the oil circuit of the shock absorber assembly, that is, the active branch is not connected. At this time, the electro-hydraulic pump can switch from torque holding mode to standby mode to save energy and reduce heat generation. In CDC mode, the leakage of oil from the oil inlet and outlet of the electro-hydraulic pump is reduced, and the damping adjustment effect of the CDC solenoid valve is improved. At the same time, in the case of electro-hydraulic pump failure, by closing the electronically controlled switch valve and the electronically controlled switch valve two, the active suspension system is switched to the traditional semi-active electronically controlled suspension, that is, the active branch is closed and the passive branch is still connected. The CDC solenoid valve on the passive branch provides damping to prevent the whole vehicle from losing control.

[0014] (2) In this invention, by setting the bracket as a split structure and connecting the first accumulator and the second accumulator cylinder to the bracket through separate oil pipes, the space occupied by the bracket can be saved.

[0015] (3) In this invention, when the first and second electrically controlled valves are closed, the electro-hydraulic pump can be pre-rotated and opened after reaching the set speed, thereby reducing the response time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the support structure provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the support provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the active branch principle structure provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the principle structure of the fully active suspension system provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the support structure provided in Embodiment 2 of the present invention; Reference numerals: 1. Bracket; 101. Bracket One; 102. Bracket Two; 2. Electro-controlled Switch Valve One; 3. Electro-controlled Switch Valve Two; 4. Accumulator One; 5. Accumulator Two; 6. Bushing; 7. Electro-hydraulic Pump; 71. Oil Port One; 72. Oil Port Two; 8. Oil Pipe Interface One; 9. Oil Pipe Interface Two; 10. Oil Passage; 11. Accumulator Three; 12. Check Valve One; 13. Solenoid Valve One; 14. Check Valve Two; 15. Solenoid Valve Two. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] See Figure 1 A fully active suspension system with switchable modes includes parallel active and passive branches and a shock absorber assembly. The shock absorber assembly is provided with a recovery chamber and a compression chamber. One end of the parallel active and passive branches is connected to the recovery chamber and the other end is connected to the compression chamber. An electronically controlled switch valve 1 2, an electro-hydraulic pump 7, and an electronically controlled switch valve 2 3 are sequentially arranged on the active branch. The oil inlet and oil outlet of the electro-hydraulic pump 7 are respectively connected to the electronically controlled switch valve 1 2 and the electronically controlled switch valve 2 3. By controlling the closure of electronically controlled valve 2 and electronically controlled valve 3, when the active suspension is in CDC mode, the electro-hydraulic pump 7 is isolated from the oil circuit of the shock absorber assembly, that is, the active branch is not connected. At this time, the electro-hydraulic pump 7 can switch from torque holding mode to standby mode to save energy and reduce heat generation. In CDC mode, the leakage of oil from the oil inlet and outlet of the electro-hydraulic pump 7 is reduced, so that the damping adjustment effect of the CDC solenoid valve is better. The solenoid valve adjustment controls the damping of the oil flow through it. Damping causes high pressure at the solenoid valve inlet. Since the oil port of the electro-hydraulic pump 7 and the solenoid valve inlet of the passive branch are connected in parallel, if there is leakage (i.e., low pressure) at the inlet and outlet of the electro-hydraulic pump 7, the oil will flow to the low-pressure area under pressure, resulting in less or no oil flow through the solenoid valve, and the solenoid valve will not be able to achieve normal damping adjustment. At the same time, in the case of electro-hydraulic pump 7 failure, by closing the electronic control switch valve 12 and electronic control switch valve 23, the active suspension system is switched to the traditional semi-active electronic control suspension, that is, the active branch is closed, while the passive branch remains open. The CDC solenoid valve on the passive branch provides damping to prevent the vehicle from losing control.

[0019] See Figure 1 , Figure 2Electro-hydraulic valve 1 (2) and electro-hydraulic valve 2 (3) are located at one end of the bracket, and electro-hydraulic pump 7 is located at the other end of the bracket 1 in the middle. Electro-hydraulic pump 7 has oil port 1 (71) and oil port 2 (72). Oil port 1 (71) is connected to electro-hydraulic valve 1 (2). Accumulator 1 (4) and accumulator 2 (5) are connected to the active branch. The connection end of accumulator 1 (4) to the active branch is located between oil port 1 (71) and electro-hydraulic valve 1 (2), and the connection end of accumulator 2 (5) to the active branch is located between oil port 2 (72) and electro-hydraulic valve 2 (3), ensuring the pressure stability of the system at high and low temperatures. Pump 7 has an oil port 1 71 and an oil port 2 72. In this embodiment, oil port 1 71 is the oil inlet and oil port 2 72 is the oil outlet. Of course, oil port 2 72 can also be used as the oil inlet and oil port 1 71 as the oil outlet. Accumulator 1 4 and accumulator 2 5 are used to eliminate the impact of oil pressure pulse on the electro-hydraulic pump when the electronic control switch valve is closed, and to ensure the stability of the oil output of electro-hydraulic pump 7 in active mode. A bushing 6 is fixedly connected to each end of the bracket 1. The bracket 1 is connected to the vehicle body through the bushing 6. The bushing 6 is used for vibration isolation.

[0020] In this embodiment, the recovery chamber is connected to one end of the parallel active and passive branches via oil pipe interface 8, and the compression chamber is connected to the other end of the parallel active and passive branches via oil pipe interface 9.

[0021] See Figure 1 In this embodiment, an electrically controlled switch valve 2, an electrically controlled switch valve 3, an accumulator 4, and an accumulator 5 are integrated by a bracket 1. The bracket 1 is fixedly connected to the electrically controlled switch valve 2, the electrically controlled switch valve 3, the accumulator 4, and the accumulator 5. Two independent oil passages 10 are opened inside the bracket 1, namely oil passage one and oil passage two. The electrically controlled switch valve 2 and the electrically controlled switch valve 3 are fixed at the middle of the bracket 1 and are symmetrically arranged about the bracket 1. Accumulator 4 and accumulator 5 are fixedly connected to both ends of the bracket 1, respectively. The first end of oil passage one is connected to oil pipe interface 8, the second end of oil passage one is connected to oil port 71, and the third end of oil passage one is connected to accumulator 4. The first end of oil passage two is connected to oil pipe interface 9, the second end of oil passage two is connected to oil port 72, and the third end of oil passage two is connected to accumulator 5.

[0022] It should be noted that both the electrically controlled switch valve 12 and the electrically controlled switch valve 23 are two-position two-way valves. Of course, two-position four-way valves can also be used to achieve the integration of control valves, such as electromagnetically driven two-position four-way valves, mechanically driven two-position four-way valves, pneumatic two-position four-way valves, etc. Accumulator 14, accumulator 25, and accumulator 311 are all piston accumulators. Of course, bellows type, diaphragm type, etc. can also be used, and are not limited to these.

[0023] Two regulating units and an accumulator 11 are connected in series on the passive branch. The accumulator 11 is located between the two regulating units. The regulating unit includes a one-way valve and a solenoid valve connected in parallel. The regulating unit includes regulating unit one and regulating unit two. Regulating unit one includes a one-way valve 12 and a solenoid valve 13 connected in parallel. Regulating unit two includes a one-way valve 24 and a solenoid valve 25 connected in parallel.

[0024] How to use: See Figure 3 , Figure 4 The control valve 1 and the control valve 2 are opened. At this time, the active branch and the passive branch are in a conductive state. Oil port 1 71 is connected to oil pipe interface 1 8, and oil port 2 72 is connected to oil pipe interface 2 9. Electro-hydraulic pump 7 pumps oil into the shock absorber assembly. Accumulator 1 4 and accumulator 2 5 are used for pressure stabilization. At this time, the fully active suspension is in active mode. When the control valves 1 and 2 are closed, the oil port 71 is not connected to the oil pipe interface 8, and the oil port 72 is not connected to the oil pipe interface 9. The oil flow of the shock absorber assembly no longer passes through the electro-hydraulic pump 7. The accumulators 4 and 5 provide a buffer for the sudden closure of the control valves 1 and 2. At this time, the fully active suspension is in CDC mode.

[0025] Example 2 See Figure 5 The difference between this embodiment and embodiment 1 is that the bracket 1 in this embodiment is a split structure, which can be a two-section structure or a multi-section structure to adapt to the actual vehicle layout requirements; this embodiment takes a two-section structure as an example. The bracket 1 includes bracket one 101 and bracket two 102. The angle α between bracket one 101 and bracket two 102 is 0°-180°. Bracket one 101 and bracket two 102 are fixedly connected. In this embodiment, bracket one 101 and bracket two 102 are fastened by bolts.

[0026] Example 3 The difference between this embodiment and embodiment 1 or embodiment 2 is that, in order to save the space occupied by the bracket 1, the connection relationship between the accumulator 1 4 and the accumulator 2 5 and the bracket 1 is changed. The accumulator 1 4 and the accumulator 2 5 are respectively connected to the active branch through an oil pipe, and the accumulator 1 4 and the accumulator 2 5 are placed in the empty space on the suspension.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A switchable mode fully active suspension system, characterized by, The parallel active branch and passive branch are connected with the recovery cavity of the damper assembly at one end and with the compression cavity at the other end, and an electric control switch valve one, an electro-hydraulic pump and an electric control switch valve two are sequentially arranged on the active branch; the active branch is further connected with an energy accumulator one and an energy accumulator two, the energy accumulator one and the energy accumulator two are used for eliminating pressure pulse or providing buffering, and the oil inlet and the oil outlet of the electro-hydraulic pump are connected with the electric control switch valve one and the electric control switch valve two respectively; the opening and closing of the electric control switch valve one and the electric control switch valve two can make the active branch conductive or non-conductive with the recovery cavity and the compression cavity.

2. A switchable mode fully active suspension system according to claim 1, wherein, The connection end of the energy accumulator one with the active branch is located between the electric control switch valve one and the electro-hydraulic pump, and the connection end of the energy accumulator two with the active branch is located between the electric control switch valve two and the energy accumulator two.

3. A switchable mode fully active suspension system according to claim 1, wherein, The bracket is fixedly connected with the electric control switch valve one, the electro-hydraulic pump and the electric control switch valve two, the electric control switch valve one and the electric control switch valve two are located at one end of the bracket, and the electro-hydraulic pump is located at the other end of the bracket.

4. A switchable mode fully active suspension system according to claim 1, wherein, The electro-hydraulic pump is provided with an oil port one and an oil port two, the oil port one forms an oil inlet or an oil outlet, and the oil port two forms an oil outlet or an oil inlet.

5. A switchable mode fully active suspension system according to claim 3, wherein, The recovery cavity is connected with one end of the parallel active branch and passive branch through an oil pipe interface one, and the compression cavity is connected with the other end of the parallel active branch and passive branch through an oil pipe interface two.

6. A switchable mode fully active suspension system according to claim 5, wherein, The bracket is provided with an oil channel one and an oil channel two, a first end of the oil channel one is communicated with the oil pipe interface one, a second end of the oil channel one is communicated with the oil port one, and a third end of the oil channel one is communicated with the energy accumulator one; a first end of the oil channel two is communicated with the oil pipe interface two, a second end of the oil channel two is communicated with the oil port two, and a third end of the oil channel two is communicated with the energy accumulator two.

7. A switchable mode fully active suspension system according to claim 1 wherein, The bracket includes a bracket one and a bracket two, and the bracket one and the bracket two are fastened by bolts.

8. A switchable mode fully active suspension system according to claim 7, wherein, The included angle between the bracket one and the bracket two is 0°-180°.

9. A switchable mode fully active suspension system according to claim 1 wherein, The energy accumulator one and the energy accumulator two are communicated with the active branch through an oil pipe respectively.

10. A switchable mode fully active suspension system according to claim 1, wherein, Two adjusting units and an energy accumulator three are connected in series on the passive branch, the energy accumulator three is located between the two adjusting units, the adjusting unit includes a check valve and a solenoid valve connected in parallel, and the adjusting unit includes an adjusting unit one and an adjusting unit two, wherein the adjusting unit one includes a check valve one and a solenoid valve one connected in parallel, and the adjusting unit two includes a check valve two and a solenoid valve two connected in parallel.

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