Novel full-active hydraulic suspension system and vehicle

Abstract

The invention provides a novel full-active hydraulic suspension system and a vehicle, the novel full-active hydraulic suspension system comprises a shock absorber assembly and an electric pump assembly, the shock absorber assembly comprises a left shock absorber and a right shock absorber, and upper and lower cavities of the shock absorbers are respectively communicated with a shock absorption damping valve; the electric pump assembly comprises a motor and a duplex gear pump, the duplex gear pump comprises two hydraulic pumps sharing one driving shaft, and an output shaft of the motor is in transmission connection with the driving shaft; an oil inlet and an oil outlet of each hydraulic pump are respectively connected with two vibration reduction damping valves of one vibration damper through electromagnetic reversing valves, and are communicated with hydraulic oil ways between upper and lower cavities of the vibration dampers and the hydraulic pumps; the hydraulic oil way is connected with an energy accumulator. By the adoption of the technical scheme, automobile driving smoothness and handling stability can be guaranteed, and the chassis space occupied by the suspension system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of active suspension systems, and in particular to a novel fully active hydraulic suspension system and a vehicle. Background Art

[0002] With the development of the automobile industry, people have higher requirements for the smoothness of automobile driving and operational stability. Traditional shock absorbers have poor shock filtering performance and average driving comfort. Although the semi-active suspension currently emerging in China can automatically adjust the suspension damping force parameters according to the vibration and working condition changes of the automobile during operation, so that the vibration frequency of the automobile is controlled within the ideal range, the adjustment effect of the suspension stiffness, damping force and body height is not obvious when the automobile is turning, starting, going uphill, and on rough roads. The body fluctuates or rises greatly when going uphill and downhill and braking, and the roll stability is also poor, which cannot meet the increasingly high requirements for the smoothness of automobile driving and handling stability. Summary of the invention

[0003] In order to better solve the above problems, the present invention provides a novel fully active hydraulic suspension system and vehicle, which can ensure the driving smoothness and handling stability of the vehicle and reduce the chassis space occupied by the suspension system.

[0004] To achieve the above-mentioned purpose, an embodiment of the present invention provides a novel fully active hydraulic suspension system, including a shock absorber assembly and an electric pump assembly, the shock absorber assembly includes two left and right shock absorbers, and the upper and lower chambers of the shock absorbers are respectively connected to vibration damping valves; the electric pump assembly includes a motor and a double gear pump, the double gear pump includes two hydraulic pumps sharing a common drive shaft, and the output shaft of the motor is drivingly connected to the drive shaft; the inlet and outlet oil ports of each hydraulic pump are respectively connected to the two vibration damping valves of a shock absorber through an electromagnetic reversing valve, connecting the hydraulic oil circuit between the upper and lower chambers of the shock absorber and the hydraulic pump; an accumulator is connected to the hydraulic oil circuit.

[0005] Optionally, the accumulator is connected between the vibration damping valve and the electromagnetic reversing valve.

[0006] Optionally, the electromagnetic reversing valve is a two-position four-way electromagnetic valve. When it is in the first valve position, the hydraulic oil circuit from the upper chamber of the shock absorber to the lower chamber of the shock absorber through the hydraulic pump is connected; when it is in the second valve position, the hydraulic oil circuit from the lower chamber of the shock absorber to the upper chamber of the shock absorber through the hydraulic pump is connected.

[0007] Optionally, the working modes of the new fully active hydraulic suspension system include a flat road mode, a rough road mode, a sports mode and a cornering mode; in the flat road mode, the hydraulic pump does not work, the electromagnetic reversing valve is closed, and the hydraulic oil flows between the upper and lower chambers of the shock absorber and the hydraulic oil circuit through the vibration damping valve, and between the accumulator and the hydraulic oil circuit; in the rough road mode, the hydraulic oil circuit between the upper and lower chambers of the shock absorber is connected, and the hydraulic oil flows between the upper and lower chambers of the shock absorber through the hydraulic oil circuit; in the sports mode, the hydraulic oil circuit between the upper and lower chambers of the shock absorber is connected; when the piston rod moves downward, the hydraulic oil in the upper chamber of the shock absorber and the accumulator flows into the hydraulic oil circuit, flows into the hydraulic pump through the electromagnetic reversing valve, and flows into the lower chamber of the shock absorber after being pressurized by the hydraulic pump; in the cornering mode, the piston rod of the inner shock absorber moves downward, and the hydraulic oil in the upper chamber flows into the hydraulic oil circuit and flows into the lower chamber after being pressurized by the hydraulic pump; the piston rod of the outer shock absorber moves upward, and the hydraulic oil in the lower chamber flows into the hydraulic oil circuit and flows into the upper chamber after being pressurized by the hydraulic pump.

[0008] According to another aspect of an embodiment of the present invention, a vehicle is further provided. The vehicle comprises any one of the novel fully active hydraulic suspension systems described above.

[0009] In the new fully active hydraulic suspension system and vehicle in the embodiments of the present invention, the motor pump assembly used includes a motor and a double gear pump. Compared with the existing structure using two motor-pump units, one motor is omitted and the two hydraulic pumps are integrated into one. The motor pump assembly structure is more optimized and the weight is lower, which can effectively reduce the chassis space occupied by the suspension system and is more conducive to the layout of the entire vehicle.

[0010] This new fully active hydraulic suspension system uses a motor-driven dual gear pump to adjust the pressure of the shock absorbers on both sides, and through the steering and valve opening control of the electromagnetic reversing valve, it can achieve synchronous or asynchronous lifting and lowering of the shock absorbers on both sides, thereby adapting to a variety of driving modes under different road conditions; and the shock absorbing damping valve can be used to adjust the internal pressure of the shock absorber, and the hydraulic pump can be used to pump the required pressure to the shock absorber to achieve adjustable damping force with a wider bandwidth of the shock absorber, which can realize rapid and automatic adjustment of the suspension stiffness, damping force and vehicle height, and improve the adjustment effect, which can meet the increasingly high requirements for vehicle driving smoothness and handling stability.

[0011] This new fully active hydraulic suspension system includes multiple working modes, including smooth road mode, rough road mode, sports mode and cornering mode. It can adapt to different driving modes of the car under different road conditions and ensure the vehicle's driving smoothness and handling stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 It is a structural schematic diagram of a novel fully active hydraulic suspension system according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the principle of the flat road mode of the novel fully active hydraulic suspension system of an embodiment of the present invention; Figure 3 It is a schematic diagram of the rough road mode of the novel fully active hydraulic suspension system according to an embodiment of the present invention; Figure 4 It is a principle schematic diagram of the motion mode of the novel fully active hydraulic suspension system according to an embodiment of the present invention; Figure 5 Schematic diagram of the principle of the cornering mode of the novel fully active hydraulic suspension system according to an embodiment of the present invention.

[0014] Reference numerals: 1. Motor; 2. Dual gear pump; 3. Solenoid reversing valve; 4. Accumulator; 5. Vibration reduction damping valve; 6. Shock absorber. DETAILED DESCRIPTION

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited to the basic implementation disclosed below.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0017] like Figure 1As shown, the novel fully active hydraulic suspension system of the embodiment of the present invention includes a shock absorber assembly and an electric pump assembly, wherein the shock absorber assembly includes two left and right shock absorbers 6, and the upper and lower chambers of the shock absorber 6 are respectively connected with a shock absorbing damping valve 5; the electric pump assembly includes a motor 1 and a double gear pump 2, the double gear pump 2 includes two hydraulic pumps sharing a driving shaft, and the output shaft of the motor 1 is drivingly connected to the driving shaft; the inlet and outlet oil ports of each hydraulic pump are respectively connected to the two shock absorbing damping valves 5 of a shock absorber 6 through an electromagnetic reversing valve 3, connecting the hydraulic oil circuit between the upper and lower chambers of the shock absorber 6 and the inlet and outlet oil ports of the hydraulic pump.

[0018] In the novel fully active hydraulic suspension system, the shock absorber 6 may include a shock absorber body consisting of an oil storage cylinder, a working cylinder sleeved in the oil storage cylinder, a piston rod assembly arranged in the working cylinder, etc. The piston of the piston rod assembly divides the interior of the working cylinder into two chambers, an upper chamber and a lower chamber. By controlling the increase or decrease of the hydraulic oil in the two chambers, the piston can be pushed up and down to achieve the purpose of changing the height of the shock absorber.

[0019] The vibration damping valve 5 can be a compression solenoid valve or a restoring solenoid valve, and can be arranged outside the cylinder of the shock absorber main body. The oil in the upper and lower chambers of the shock absorber 6 can flow out through the vibration damping valve 5, and the external oil can flow into the upper and lower chambers of the shock absorber 6 through the vibration damping valve 5. By adjusting the valve opening of the vibration damping valve 5, the damping force of the shock absorber 6 can be adjusted.

[0020] The electric pump assembly consists of a motor and two hydraulic pumps. Here, the two hydraulic pumps are integrated side by side. A drive shaft passes through the two hydraulic pumps and is connected to the output shaft of the motor. The motor can be used to drive the two hydraulic pumps at the same time. Compared with the existing motor pump structure using two sets of motor-pump units, the structure of this motor pump assembly reduces one motor; the drive control of the two hydraulic pumps can be achieved through a single controller, which also reduces one controller; the two hydraulic pumps are also integrated into one. The overall structure of the motor pump assembly is more integrated and lighter, which can reduce the chassis space occupied by the suspension system and is more conducive to the layout of the entire vehicle.

[0021] Both hydraulic pumps have two oil inlets and outlets, that is, the structure of the double gear pump is a double-inlet and double-outlet structure (one side is the oil inlet at the same time, and the other side is the oil outlet at the same time), and the inlet and outlet directions of the oil inlets and outlets change with the motor's direction of rotation. The two hydraulic pumps of the electric pump assembly respectively form a closed-loop hydraulic oil circuit with the left and right shock absorbers 6. Specifically, the oil inlet and outlet of the left shock absorber 6 are connected to the upper and lower chambers of the left shock absorber 6 through the electromagnetic reversing valve 3 and the vibration damping valve 5, and the oil inlet and outlet of the right shock absorber 6 are connected to the upper and lower chambers of the right shock absorber 6 through the electromagnetic reversing valve 3 and the vibration damping valve 5, forming a hydraulic oil circuit between the upper and lower chambers of the shock absorber 6: upper chamber-vibration damping valve 5-electromagnetic reversing valve 3-hydraulic pump-electromagnetic reversing valve 3-vibration damping valve 5-lower chamber, and the hydraulic oil in the upper chamber of the shock absorber 6 can flow into the lower chamber of the shock absorber 6 through the hydraulic oil circuit, and the hydraulic oil in the lower chamber of the shock absorber 6 can flow into the upper chamber of the shock absorber 6 through the hydraulic oil circuit. The hydraulic oil circuit is controlled by the electromagnetic reversing valve 3, that is, the electromagnetic reversing valve 3 controls the on-off and oil flow direction of the hydraulic oil circuit between the shock absorber 6 and the hydraulic pump. Based on the control of the electromagnetic reversing valve 3, the shock absorbers 6 on both sides can be raised and lowered synchronously when the motor 1 drives the two hydraulic pumps to run synchronously, or they can be raised and lowered asynchronously to achieve different loads on the shock absorbers 6 on both sides. The electromagnetic reversing valve 3 can be a two-position four-way reversing valve. In the first valve position, the oil in the upper chamber of the shock absorber 6 can flow into the lower chamber of the shock absorber 6 through the reversing valve; in the second valve position, the oil in the lower chamber of the shock absorber 6 can flow into the upper chamber of the shock absorber 6 through the reversing valve.

[0022] The new fully active hydraulic suspension system is composed of a set of electric pumps and is used in conjunction with two shock absorbers 6. The damping force can be adjusted by adjusting the oil flow inside the shock absorber 6 using the vibration damping valve 5. The pumping pressure in the hydraulic oil circuit can also be adjusted using the hydraulic pump to increase the damping adjustment bandwidth of the shock absorber 6.

[0023] In the embodiment of the present invention, the novel fully active hydraulic suspension system further includes an accumulator 4, which is connected to the hydraulic oil circuit between the shock absorber 6 and the hydraulic pump, which is equivalent to the accumulator 4 being connected to the upper and lower chambers respectively. The accumulator 4 can be specifically connected between the shock absorbing damping valve 5 and the electromagnetic reversing valve 3. For example, by connecting a pressure distribution valve on the hydraulic oil circuit facing the hydraulic pump side of the shock absorbing damping valve 5, and connecting the accumulator 4 through the pressure distribution valve, the accumulator 4 can actively store and release oil through the conversion of the pressure distribution valve to adjust the pressure in the hydraulic oil circuit, thereby adjusting the pressure of the shock absorber 6. The volume of the accumulator 4 is adjusted as the pressure increases or decreases, playing the role of damping and pressure storage.

[0024] According to an exemplary embodiment of the present invention, the new fully active hydraulic suspension system has multiple working modes, including a flat road mode, a rough road mode, a sports mode and a curve mode. In an optional embodiment, the suspension system also includes a controller and a vehicle body state detection device composed of a pressure sensor, an acceleration sensor, a camera, etc. The controller obtains the vehicle body pressure signal, acceleration signal, front and rear road condition pictures and other information during the driving process of the vehicle, and identifies the different driving states of the vehicle, and then generates control instructions for the corresponding working mode and transmits them to the electromagnetic reversing valve 3 and the motor 1 and other components to execute the corresponding working mode, control the motor 1 to rotate forward and reverse and adjust the speed, and control the electromagnetic reversing valve to adjust the direction, so as to adapt to different driving modes under different road conditions.

[0025] The smooth road mode is suitable for the vehicle driving on a smooth road, such as Figure 2 As shown, in the flat road mode, the movement amplitude of the shock absorber 6 (the upward or downward amplitude of the piston rod) is small, the opening of the vibration damping valve 5 is small, the hydraulic pump does not work, the hydraulic oil circuit between the upper and lower chambers of the shock absorber 6 is not conductive (the electromagnetic reversing valve 3 does not need to be reversed), and the hydraulic oil does not flow between the upper and lower chambers of the shock absorber 6. The hydraulic oil in the upper (lower) chamber of the shock absorber 6 can flow into the hydraulic oil circuit through the vibration damping valve 5 and then into the accumulator; conversely, the hydraulic oil in the accumulator can flow into the hydraulic oil circuit and then flow into the upper (lower) chamber through the vibration damping valve 5; the pressure of the upper and lower chambers of the shock absorber is adjusted by the accumulator 4, and the oil in the hydraulic oil circuit can flow between the upper (lower) chamber of the shock absorber and the pressure storage chamber of the accumulator 4.

[0026] Rough road mode is suitable for the vehicle driving on rough roads, such as Figure 3 As shown, in the rough road mode, the shock absorber 6 has a large movement amplitude, the vibration reduction damping valve 5 has a large opening, the hydraulic oil circuit between the upper and lower chambers of the shock absorber 6 is connected, and the hydraulic oil can flow between the upper and lower chambers of the shock absorber 6 through the hydraulic oil circuit; the hydraulic oil in the upper (lower) chamber of the shock absorber can flow into the hydraulic oil circuit, and the hydraulic oil in the accumulator can flow into the hydraulic oil circuit. The hydraulic oil in the hydraulic oil circuit can flow into the upper (lower) chamber of the shock absorber and the accumulator, the forward and reverse rotation of the motor drives the hydraulic pump to move forward and reversely, the electromagnetic reversing valve turns synchronously, and the vehicle body always remains level.

[0027] The sports mode is suitable for the running mode driving condition of the automobile. The sports mode is suitable for resisting the compression downward trend of the shock absorber 6, and the piston moves downward to increase the height of the vehicle body; Figure 4As shown, in the sport mode, the sport modes of the two shock absorbers are consistent, the valve positions of the electromagnetic reversing valves are consistent, the hydraulic oil circuit between the upper and lower chambers of the shock absorber 6 is connected, and the hydraulic pump works actively to pump the required hydraulic pressure. When the piston rod moves downward, part of the hydraulic oil in the upper chamber of the shock absorber 6 flows into the hydraulic oil circuit, and part of the hydraulic oil in the accumulator 4 also flows into the hydraulic oil circuit. The two parts of oil flow into the hydraulic pump through the electromagnetic reversing valve 3 at the same time, and then flow into the lower chamber of the shock absorber 6 through the electromagnetic reversing valve 3 after being pressurized by the hydraulic pump. The lower chamber of the shock absorber 6 is filled with oil, and the vehicle body rises.

[0028] The curve mode is suitable for the driving condition when the car enters a curve. Under the curve driving condition, the centrifugal force of the car body compresses the outer shock absorber 6, so that the outer body of the car is lowered. Figure 5 As shown, in the curve mode, the inner and outer shock absorbers have different movement modes, one side moves downward and the other side moves upward. The valve positions of the electromagnetic reversing valves corresponding to the double gear pumps are different, and the hydraulic oil flow modes of the two shock absorbers are opposite. The piston rod of the left (inner) shock absorber 6 moves downward, and part of the oil in the upper chamber of the shock absorber 6 flows into the hydraulic oil circuit through the vibration damping valve 5, and then flows into the hydraulic pump through the electromagnetic reversing valve 3. After being pressurized by the hydraulic pump, it flows into the lower chamber of the shock absorber 6 through the electromagnetic reversing valve 3; the piston rod of the right (outer) shock absorber 6 moves upward, and part of the oil in the lower chamber of the shock absorber 6 flows into the hydraulic oil circuit through the vibration damping valve 5, and then flows into the hydraulic pump through the electromagnetic reversing valve 3. After being pressurized by the hydraulic pump, it flows into the upper chamber of the shock absorber 6 through the electromagnetic reversing valve 3. In this mode, the hydraulic pump works actively and pumps the required hydraulic pressure, which can make the outer side of the vehicle body rise and the inner side fall.

[0029] On the basis of the above-mentioned novel fully active hydraulic suspension system, an embodiment of the present invention further provides a vehicle, which includes the above-mentioned novel fully active hydraulic suspension system and has the beneficial effects of the above-mentioned fully active hydraulic suspension system, which will not be described in detail here.

[0030] In actual application scenarios, the shock absorbers, motors, accumulators, electromagnetic reversing valves, etc. in the new fully active hydraulic suspension system of the embodiment of the present invention can adopt devices with corresponding functions in the prior art; the twin gear pump can be integrated into a dual hydraulic pump according to actual hydraulic requirements and chassis space; and other devices or components can also be arranged in the new fully active hydraulic suspension system, and the actual installation positions of some components can also be adjusted to realize the actual application or other functions of the active suspension hydraulic system.

[0031] It should be noted that, according to implementation needs, the various components described in the embodiments of the present invention may be split into more components, or two or more components or parts of components may be combined into a new component to achieve the purpose of the embodiments of the present invention.

[0032] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A novel fully active hydraulic suspension system, comprising a shock absorber assembly and an electric pump assembly, characterized in that: The shock absorber assembly includes two left and right shock absorbers, and the upper and lower chambers of the shock absorbers are respectively connected to vibration damping valves; the electric pump assembly includes a motor and a double gear pump, and the double gear pump includes two hydraulic pumps sharing a driving shaft, and the output shaft of the motor is drivingly connected to the driving shaft; the inlet and outlet oil ports of each hydraulic pump are respectively connected to the two vibration damping valves of a shock absorber through an electromagnetic reversing valve, connecting the hydraulic oil circuit between the upper and lower chambers of the shock absorber and the hydraulic pump; an accumulator is connected to the hydraulic oil circuit.

2. A novel fully active hydraulic suspension system according to claim 1, characterized in that: The accumulator is connected between the vibration reduction damping valve and the electromagnetic reversing valve.

3. A novel fully active hydraulic suspension system according to claim 1, characterized in that: The electromagnetic reversing valve is a two-position four-way electromagnetic valve. When in the first valve position, the hydraulic oil circuit from the upper chamber of the shock absorber to the lower chamber of the shock absorber through the hydraulic pump is connected; when in the second valve position, the hydraulic oil circuit from the lower chamber of the shock absorber to the upper chamber of the shock absorber through the hydraulic pump is connected.

4. A novel fully active hydraulic suspension system according to claim 1, characterized in that: The working modes of the novel fully active hydraulic suspension system include a smooth road mode, a rough road mode, a sports mode and a cornering mode; In the smooth road mode, the hydraulic pump does not work, the electromagnetic reversing valve is closed, and the hydraulic oil flows between the upper and lower chambers of the shock absorber and the hydraulic oil circuit through the vibration damping valve, and between the accumulator and the hydraulic oil circuit; In the rough road mode, the hydraulic oil circuit between the upper and lower chambers of the shock absorber is connected, and the hydraulic oil flows between the upper and lower chambers of the shock absorber through the hydraulic oil circuit; The forward and reverse rotation of the motor drives the hydraulic pump to move forward and reverse, and the electromagnetic reversing valve turns synchronously to keep the vehicle body level; In the sports mode, the hydraulic oil circuit between the upper and lower chambers of the shock absorber is connected; when the piston rod moves downward, the hydraulic oil in the upper chamber of the shock absorber and the accumulator flows into the hydraulic oil circuit, flows into the hydraulic pump through the electromagnetic reversing valve, and flows into the lower chamber of the shock absorber after being pressurized by the hydraulic pump; In the cornering mode, the movement modes of the two shock absorbers are opposite, the piston rod of the shock absorber on one side moves downward, and the hydraulic oil in the upper chamber flows into the hydraulic oil circuit and is pressurized by the hydraulic pump before flowing into the lower chamber; The piston rod of the shock absorber on the other side moves upward, and the hydraulic oil in the lower chamber flows into the hydraulic oil circuit and flows into the upper chamber after being pressurized by the hydraulic pump.

5. A vehicle, characterized in that: The vehicle comprises the novel fully active hydraulic suspension system according to any one of claims 1-4.

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