CN115139725B - Hydraulic active suspension system - Google Patents
Hydraulic active suspension system Download PDFInfo
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- CN115139725B CN115139725B CN202211081083.2A CN202211081083A CN115139725B CN 115139725 B CN115139725 B CN 115139725B CN 202211081083 A CN202211081083 A CN 202211081083A CN 115139725 B CN115139725 B CN 115139725B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
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Abstract
The present disclosure provides a hydraulic active suspension system comprising: the oil storage module comprises an oil storage tank for storing suspension oil; the balance module is connected with the oil storage module through an oil supply main path; the four hydraulic branches are connected with the balancing module, and the balancing module is used for balancing the oil pressure of the four hydraulic branches; and redundant branch road, with the oil storage module intercommunication and parallelly connected with balanced module, including suspension fluid and redundant fluid in the redundant branch road, wherein, the oil storage module provides first oil pressure to balanced module through suspension fluid, the oil storage module through suspension fluid to redundant branch road provides the second oil pressure, redundant branch road with suspension fluid the second oil pressure converts the redundant oil pressure of redundant fluid into. Suspension oil in the oil storage module of the active suspension system can provide a redundant system for a steering system and a braking system which have different oil requirements from the suspension oil, so that the situation that corresponding oil tanks are independently arranged for the redundant system of the steering system and the braking system is avoided, and the number of parts and the occupation of space are reduced.
Description
Technical Field
The invention relates to the technical field of automobile structures, in particular to a hydraulic active suspension system.
Background
A suspension is a general term for all force-transmitting connecting devices between a vehicle frame (or a load-bearing vehicle body) and an axle (or a wheel). Its function is to transmit the vertical reaction (supporting force), longitudinal reaction (traction and braking force) and lateral reaction on the wheels and the moment caused by these reactions to the frame (or load-bearing body) by the active suspension system, so as to ensure the normal running of the car.
However, the conventional suspension has some defects when meeting special conditions such as steering control, getting on and off of cargos, poor road passing, suspension of a vehicle body and the like, and needs to be improved. In addition, in the conventional steering system and brake system of a vehicle, when the brake system and the steering system are failed or failed, an accident is easily caused.
Therefore, redundant systems corresponding to the braking system or the steering system respectively need to be arranged, however, the steering system and the braking system are different in applied oil and different in applied oil with the active suspension system, so that the steering system and the braking system need to respectively adopt one set of power source to provide hydraulic power assistance for each system, and the hydraulic power assisting system has the advantages of multiple parts, large occupied space and high cost.
Disclosure of Invention
In order to solve the above technical problem, the present disclosure provides a hydraulic active suspension system.
In a first aspect, the present disclosure provides a hydraulic active suspension system comprising: the oil storage module comprises an oil storage tank for storing suspension oil; the balance module is connected with the oil storage module through an oil supply main path; the four hydraulic branches are connected with the balancing module, and the balancing module is used for balancing the oil pressure of the four hydraulic branches; and a redundant branch circuit, with the oil storage module intercommunication and with the balancing module is parallelly connected, include in the redundant branch circuit suspension fluid and redundant fluid, wherein, the oil storage module passes through suspension fluid to the balancing module provides first oil pressure, the oil storage module passes through suspension fluid to redundant branch circuit provides the second oil pressure, redundant branch circuit will suspension fluid the second oil pressure convert into the redundant oil pressure of redundant fluid.
In some embodiments, the redundant branch comprises: the first electromagnetic valve is used for controlling the on-off of the redundant branch and the oil storage module; the pressure transmission module comprises a first cylinder body and a first piston, the first piston is positioned in the first cylinder body and divides the first cylinder body into two cavities which are not communicated, the suspension oil is contained in the cavity close to one side of the first electromagnetic valve, and the redundant oil is contained in the cavity far away from one side of the first electromagnetic valve; after the first electromagnetic valve is opened, the oil storage module provides the second oil pressure for the redundant branch through the suspension oil, the second oil pressure pushes the first piston to move in the first cylinder body in the direction away from the first electromagnetic valve, and the suspension oil extrudes the redundant oil to convert the second oil pressure into redundant oil pressure.
In some embodiments, the redundant branch circuit comprises: the steering branch road is used for being connected with the steering system; and the braking branch road is connected with the braking system, wherein the steering branch road is connected with the braking branch road in parallel.
In some embodiments, the oil storage module further comprises: the hydraulic pump is positioned in the main oil supply path and connected between the oil storage tank and the balancing module; the first oil pressure spring is connected with the main oil supply path through a first branch path and is positioned between the hydraulic pump and the balance module; and the oil pressure auxiliary assembly comprises a second solenoid valve and a second oil pressure spring, the oil pressure auxiliary assembly is connected with the main oil supply way through a second branch and is positioned between the first oil pressure spring and the balance module, and the first oil pressure spring and the second oil pressure spring are electrically connected with the electronic control unit.
In some embodiments, the balancing module comprises a central cylinder comprising: the balance cavity comprises a middle cavity and end cavities positioned at two ends of the middle cavity, and the volume of the middle cavity is greater than that of the end cavities; the balance piston comprises three rigidly connected sub-pistons which are respectively positioned in the end cavity and the middle cavity and are three, and the sub-pistons divide the balance cavity into a left front cavity, a right rear cavity, a left rear cavity and a right front cavity, and the left front cavity and the right front cavity are positioned in the end cavity.
In some embodiments, the left front cavity is adjacent to the right rear cavity, and the left rear cavity is adjacent to the right front cavity.
In some embodiments, the balancing module further comprises balancing branches, one ends of the balancing branches are connected with the main oil supply path, and the other ends of the balancing branches are connected with the balancing cavities of the central cylinder, so as to transfer the first oil pressure of the oil storage module to the central cylinder; the balance branch comprises four parallel left front branches, right rear branches, left rear branches and right front branches, and a third electromagnetic valve is arranged on each balance branch and used for controlling the on-off of each balance branch.
In some embodiments, a fourth solenoid valve is connected between the left front branch and the right front branch; and a fifth electromagnetic valve is connected between the right rear branch and the left rear branch.
In some embodiments, each of the hydraulic branches includes: the branch oil cylinder is connected with the corresponding cavity of the central cylinder and comprises a second cylinder body and a second piston, wherein suspension oil enters and exits under the action of the first oil pressure to achieve damping and buffering of the suspension, and the height of the suspension is adjusted through the extending length of a piston rod of the second piston.
In some embodiments, the hydraulic branch further comprises: and the damping valve is connected between the central cylinder and the branch oil cylinder and is used for adjusting the damping of the hydraulic branch by adjusting the flow area of the suspension oil in the main branch.
In some embodiments, the hydraulic branch further comprises a third oil pressure spring and a fourth oil pressure spring; the third oil pressure spring and the fourth oil pressure spring are respectively connected to two ends of the damping valve, and the third oil pressure spring and the fourth oil pressure spring are electrically connected with the electronic control unit.
In some embodiments, the hydraulic branch further comprises a stiffness adjustment assembly comprising: the fifth oil pressure spring is used for being communicated with the branch oil cylinder and is electrically connected with the electronic control unit; and the spring stiffness conversion valve controls the stiffness of the hydraulic branch by controlling the on-off of the fifth oil pressure spring and the branch oil cylinder.
In some embodiments, the hydraulic branch further comprises: a vibration sensor including one or more sensors for detecting vibration of the vehicle body; a height sensor for detecting a height of the suspension; and the pressure sensor is used for detecting the oil pressure of the branch oil cylinder.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: suspension oil in the oil storage module of the active suspension system can provide a redundant system for a steering system and a braking system which have different oil requirements from the suspension oil, so that the situation that corresponding oil tanks are independently arranged for the redundant system of the steering system and the braking system is avoided, and the number of parts and the occupation of space are reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 shows a schematic oil circuit diagram of an oil storage module, a balancing module and a redundant branch of an active suspension system;
FIG. 2 shows a schematic of the oil circuit of the front left hydraulic branch;
fig. 3 shows a schematic oil circuit diagram of the right rear hydraulic branch circuit.
Detailed Description
The disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those of ordinary skill in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the present disclosure.
The suspension can be divided into three basic types, passive suspension, semi-active suspension and active suspension, according to whether the performance of the suspension is controlled during the running process of the vehicle. The suspension which does not need to be controlled by inputting energy is called a passive suspension, and the controllable damping suspension which is used for adjusting the damping coefficient by inputting a small amount of energy is called a semi-active suspension.
The active suspension refers to the suspension system, the rigidity and the damping characteristic of which can be dynamically and adaptively adjusted according to the driving conditions of the automobile, so that the suspension system is always in an excellent shock absorption state.
The active suspension system is a novel suspension system controlled by a computer. The active suspension system has the function of controlling the vibration of the vehicle body and the height of the vehicle body by changing the vibration, the height, the damping and the like of the suspension system, and has the function of controlling the motion of the vehicle body.
For the current steering system and braking system of a vehicle, when the braking system and the steering system are in failure, accidents are easy to happen.
Therefore, redundant systems corresponding to the braking system or the steering system respectively need to be arranged, however, the steering system and the braking system are different in applied oil and different in applied oil from the active suspension system, so that the steering system and the braking system need to respectively adopt one set of power source to provide hydraulic power assistance for each system, and not only are a plurality of parts, but also the occupied space is large, and the cost is high.
In order to solve the above technical problem, the present disclosure provides a hydraulic active suspension system, as shown in fig. 1 and 2, which includes an oil storage module 10, a balancing module 20, four hydraulic branches 30, and a redundant branch 40.
The oil storage module 10 may be communicated with the balancing module 20 through an oil supply main path 111, and is configured to supply oil to the balancing module 20. The oil storage module 10 includes an oil reservoir 11 that stores suspension oil, a hydraulic pump 12, a first oil pressure spring 13, and an oil pressure auxiliary assembly.
The low-pressure suspension oil is stored in the oil storage tank 11, the hydraulic pump 12 is located on the main oil supply path 111 and is arranged between the oil storage tank 11 and the balancing module 20, the low-pressure suspension oil in the oil storage tank 11 is pressurized to be high-pressure suspension oil, and the suspension oil generates high-pressure oil pressure to enter the balancing module 20 or the redundant branch circuit 40. The hydraulic pump 12 may be a gear pump, a plunger pump, or the like, or may be a brush motor or a brushless motor, and is not particularly limited herein.
A first oil pressure spring 13 connected to the main oil supply path 111 through a first branch path and connected between the hydraulic pump 12 and the balance module 20; when the oil pressure of the main oil supply path 111 is higher than the preset oil pressure threshold, the high-pressure oil can overflow into the first oil pressure spring 13, so that the oil pressure of the main oil supply path 111 can be maintained at a stable level, and an overpressure protection effect is achieved.
Further, the first oil spring 13 can be electrically connected with an electronic control system (hereinafter referred to as ECU) of the vehicle, and the working process of the first oil spring 13 is controlled by the ECU, so that the pressure in the main oil supply path 111 can be controlled more accurately, the control precision is higher, and the problem that the pressure of the main oil supply path 111 is too large due to insufficient pressure relief, so that a system pipeline or other parts are damaged, or the problem that the pressure loss is generated due to too large pressure relief, and the lamp needs to be repeatedly pressurized is avoided.
The oil pressure auxiliary assembly includes a second solenoid valve 14 and a second oil pressure spring 15, and is connected to the main oil supply passage 111 through a second branch passage, and is located between the first oil pressure spring 13 and the balancing module 20.
Specifically, the oil pressure auxiliary assembly can reduce the pressure buildup time (i.e., the time to build pressure) of the hydraulic pump 12. When the hydraulic pump 12 provides suspension oil to the balancing module 20 and the four hydraulic branches 30, the hydraulic pump 12 needs to operate for a period of time due to the necessary start time of the hydraulic pump 12 and the long pipeline, and then the oil pressure required by the balancing module 20 and the four hydraulic branches 30 can be established. When the oil pressure needs to be reestablished after the branch cylinders corresponding to the wheels discharge the suspension oil and reduce the height of the vehicle body, 20 to 30 seconds may be needed.
And through the auxiliary oil pressure subassembly, can play the effect of supplementary hydraulic pump 12 pressure build, specifically, when need not supplementary pressure build, highly compressed suspension fluid can be stored to second oil pressure spring 15, when needs supplementary pressure build, opens second solenoid valve 14 (can be for two-position two-way reversing valve), high pressure suspension fluid that prestores in the emergency release second oil pressure spring 15, so, make balanced module 20 can build pressure fast for the speed that the suspension rises, can shorten at least 2-3 seconds.
Further, the second oil pressure spring 15 is also electrically connected with the ECU, when the vehicle body needs to be lifted urgently due to the fact that the road jolts, the ECU can quickly pre-judge and send a signal to indicate the second electromagnetic valve 14 to be opened, so that the second oil pressure spring 15 releases high-pressure suspension oil, and the speed of the active suspension system obtaining the high-pressure oil is greatly improved. Therefore, the pressure building time is short, and the reaction speed of the vehicle body is quicker.
Further, the redundant branch circuit 40 is connected to the oil storage module 10 and connected to the balancing module 20 in parallel, and the oil storage module 10 can provide oil pressure to the balancing module 20 and the redundant branch circuit 40 at the same time, for example, the oil storage module 10 provides a first oil pressure to the balancing module 20 through the suspension oil, and the oil storage module 10 provides a second oil pressure to the redundant branch circuit 40 through the suspension oil.
The fluid that flows through in whole balancing module 20 is suspension fluid, and the part of redundant branch road 40 partial flow suspension fluid, the part redundant fluid that flows through, wherein, redundant branch road 40 converts the second oil pressure of suspension fluid into the redundant oil pressure of redundant fluid.
In the disclosed embodiment, the redundant branch 40 is used to provide redundant assistance to the steering supply and braking system, and therefore, the redundant branch 40 includes a steering branch 43 connected to the steering system and a braking branch 44 connected to the braking system, and the steering branch 43 is connected in parallel with the braking branch 44.
Further, each redundant branch 40 includes a first solenoid valve 41 and a pressure transfer module 42.
The first electromagnetic valve 41 is disposed between the hydraulic pump 12 and the pressure transmission module 42, and may be a two-position two-way directional valve, and the first electromagnetic valve 41 is used for controlling on/off of the redundant branch 40 and the oil storage module 10. The pressure transmission module 42 includes a first cylinder and a first piston, the first piston is located in the first cylinder and divides the first cylinder into two cavities that are not communicated, suspension oil is contained in the cavity close to one side of the first solenoid valve 41, and redundant oil is contained in the cavity far away from one side of the first solenoid valve 41.
The redundant oil and the suspension oil are non-homogeneous and immiscible oil, the redundant oil is braking oil in the braking branch path 44, and the redundant oil is steering oil in the steering branch path 43.
After the first solenoid valve 41 is opened, the oil storage module 10 provides the second oil pressure to the redundant branch 40 through the suspension oil, that is, the hydraulic pump 12 pressurizes the suspension oil in the oil storage tank 11 and delivers the pressurized suspension oil to the redundant branch 40, so that the suspension oil between the hydraulic pump 12 and the pressure transmission module 42 has the second oil pressure. The second oil pressure pushes the first piston to move in the direction away from the first solenoid valve 41 in the first cylinder, and the suspension oil presses the redundant oil to convert the second oil pressure into the redundant oil pressure. The redundant oil pressure is used to provide assistance to the steering system or the braking system.
As can be seen from the above, the active suspension system of the present disclosure includes the redundant branch circuit 40, so that the oil pressure can be provided by the oil storage module 10 of the active suspension system in the steering system or the redundant system of the braking system of the vehicle, and specifically, the oil pressure between different oils can be transmitted by the pressure transmission module 42 on the redundant branch circuit 40, so that the active suspension system and the braking system or the redundant system of the steering system can share one oil storage tank 11 and one hydraulic pump 12, so that the redundant system of the braking system does not need to additionally and separately set the oil storage tank 11 of the braking oil, and the redundant system of the steering system also does not need to additionally and separately set the oil storage tank 11 of the steering oil, thereby reducing the number of parts and the stacking space.
Further, the balancing module 20 is connected with the oil storage module 10 through the oil supply main path 111; the four hydraulic branches 30 are connected to the balancing module 20, and the balancing module 20 is configured to transmit the first oil pressure of the oil storage module 10 to the corresponding hydraulic branches 30, and may also balance the oil pressures of the four hydraulic branches 30.
The balancing module 20 includes a central cylinder 21 and four balancing branches, and the balancing branches include four parallel left front branch 221, right rear branch 222, left rear branch 223, and right front branch 224, which correspond to the left front wheel, the right rear wheel, the left rear wheel, and the right front wheel, respectively.
One end of each balance branch is connected with the main oil supply path 111, and the other end of each balance branch is connected with the central cylinder 21, and is used for transmitting the high-pressure first oil pressure generated by the hydraulic pump 12 in the oil storage module 10 to the central cylinder 21; and each balance branch is provided with a third electromagnetic valve 225 for controlling the on-off of each balance branch.
The third electromagnetic valve 225 may be a two-position two-way reversing valve, the third electromagnetic valve 225 is connected to the ECU, when the vehicle runs to an uneven road and bumps, the vibration sensor, the height sensor and the pressure sensor in each hydraulic branch 30 transmit each signal of the suspension at each wheel to the ECU, and the ECU controls the opening and closing of the third electromagnetic valve 225 of the corresponding wheel according to the signal, so as to control the on-off of the balancing branch of the corresponding wheel.
The central cylinder 21 includes a balance cavity and a balance piston 215, the balance cavity includes a middle cavity and end cavities located at both ends of the middle cavity, the volume of the middle cavity is greater than that of the end cavities, and the middle cavity and the end cavities are communicated with each other.
The balance piston 215 comprises three rigidly connected sub-pistons which are respectively positioned in an end cavity and a middle cavity, the three sub-pistons divide the balance cavity into a left front cavity 211, a right rear cavity 212, a left rear cavity and a right front cavity which are communicated, the left front cavity 211, the right rear cavity 212, the left rear cavity 213 and the right front cavity 214 are respectively connected with a left front branch 221, a right rear branch 222, a left rear branch 223 and a right front branch 224 of the balance branch, when the pressure of a certain cavity changes, the three pistons of the balance piston 215 slide in the balance cavity, and therefore the oil pressures of the four cavities, namely the oil pressures of the four balance branches, are balanced.
Therefore, the suspension of the four wheels can be adjusted in height, damping or vibration at the same time, so that the whole vehicle is more comfortable, stable and safe in the running process.
Further, the left and right front cavities 211 and 214 are located at the end cavities, and most of the right and left rear cavities 212 and 213 are located at the middle cavity. Therefore, the volumes of the front left chamber 211 and the front right chamber 214 are smaller than the volumes of the rear right chamber 212 and the rear left chamber 213, that is, the chamber volume of the front two wheels is smaller than the chamber volume of the rear two wheels.
Because the weight that the front axle needs to bear is greater than the rear axle, consequently for the rear axle, require the reaction of front axle more rapid, and the cavity that the front axle that is small corresponds just can satisfy the requirement that the front axle reacts rapidly. For example, when the oil pressure of the hydraulic branch 30 corresponding to the front axle changes, the hydraulic branch can quickly react to the end cavity, because the end cavity is small in size and large in volume change rate, the hydraulic branch can quickly react with the rear axle, so that the front axle can quickly balance with the rear axle, the suspension of the left front wheel or the right front wheel can quickly react, when the hydraulic branch 30 corresponding to the rear axle changes, the middle cavity corresponding to the rear axle is large in size and small in volume change rate, therefore, the rear axle and the front axle are slow in balancing speed, and the left rear wheel and the right rear wheel are soft and comfortable.
Further, the left front cavity 211 is adjacent to the right rear cavity 212, and the left rear cavity 213 is adjacent to the right front cavity 214.
Specifically, if the wheel of the hydraulic branch 30 corresponding to the left front cavity 211 changes, for example, the left front wheel is squeezed by a stone, and pushes the suspension of the left front wheel upward, the oil pressure of the hydraulic branch 30 corresponding to the left front wheel increases, and when the hydraulic branch 30 corresponds to the balance cavity of the central cylinder 21, the volume of the left front cavity 211 increases, so as to push the balance piston 215 to move rightward, so that the volume of the right rear cavity 212 increases, and the volumes of the left rear cavity 213 and the right front cavity 214 decrease at the same time.
It can be seen that the suspension of the right rear wheel corresponding to the right rear cavity 212 is raised, while the suspension of the left rear wheel corresponding to the left rear cavity 213 and the suspension of the right front wheel corresponding to the right front cavity 214 are lowered. Thus, when a pressure change occurs in one hydraulic branch 30 of the vehicle, the pressure (i.e. the suspension height) of the hydraulic branch 30 of the diagonal wheel can be rapidly changed according to the opposite form, and the pressure (i.e. the suspension height) of the hydraulic branch 30 of the adjacent wheel can be rapidly changed according to the same form, so that the excessive roll of the vehicle body in the horizontal direction is limited, or the excessive displacement of the vehicle body in the vertical direction is limited, and therefore, the occurrence of the roll and bump phenomena is avoided, and the riding comfort of the vehicle and the running smoothness of the vehicle are improved.
Further, a fourth electromagnetic valve 226 is connected between the left front branch 221 and the right front branch 224, that is, the fourth electromagnetic valve 226 is used for controlling on-off of the two hydraulic branches 30 of the front axle; and a fifth solenoid valve 227 is connected between the right rear branch 222 and the left rear branch 223, that is, the fifth solenoid valve 227 is used for controlling the on-off of the two hydraulic branches 30 of the rear axle. The fourth solenoid valve 226 and the fifth solenoid valve 227 may also be two-position, two-way reversing valves.
In some embodiments, the four hydraulic branches 30 may be identical or different in structure. In the disclosed embodiment, the left front hydraulic branch and the right front hydraulic branch are identical in structure (as shown in fig. 2), but may be different in structure from the left rear hydraulic branch and the right rear hydraulic branch (as shown in fig. 3). As shown in fig. 2, the left front position is connected to the left front chamber 211 of the balance chamber of the center cylinder 21, and as shown in fig. 3, the right rear position is connected to the right rear chamber 212 of the balance chamber of the center cylinder 21.
The hydraulic branch 30 includes a branch cylinder 31 connected to a corresponding cavity of the center cylinder 21, and the branch cylinder 31 includes a second cylinder body and a second piston 312. Wherein, suspension fluid gets into and out the second cylinder body under the effect of first oil pressure to the realization is to the shock attenuation buffering of suspension, and adjusts the height of suspension through the length of stretching out of the piston rod of second piston 312.
In some embodiments, the hydraulic branch 30 further comprises a damping valve 32 connected between the center cylinder 21 and the branch cylinder 31 for adjusting the damping of the hydraulic branch 30 by adjusting the flow area of the suspension oil in the main branch path. Specifically, the damping valve 32 is a combination of a flow control valve and a stepping motor (not shown in the figure), the stepping motor is controlled by the ECU, and when the ECU adjusts the flow area of the hydraulic branch 30 according to the signal transmitted by the sensor assembly, the valve core of the flow control valve is adjusted to a corresponding position by starting the stepping motor to rotate, so as to adjust the thickness of the hydraulic branch 30.
The smaller the flow area, the "finer" the suspension oil is, the more difficult it is to pass through, and the greater the damping. The greater the damping, the shorter the vibration time from vibration to stationary when the suspension of the corresponding wheel encounters vibration or bump. Thus, the vibration time of each wheel suspension can be changed according to actual road conditions and passenger requirements.
In some embodiments, the hydraulic branch 30 further comprises a third oil pressure spring 33 and a fourth oil pressure spring 34; the third hydraulic spring 33 and the fourth hydraulic spring 34 are respectively connected to two ends of the damping valve, and the third hydraulic spring 33 and the fourth hydraulic spring 34 are electrically connected to the electronic control unit.
The third oil pressure spring 33 and the fourth oil pressure spring 34 can play a role of overpressure protection, when the oil pressure of the hydraulic branch 30 is too large, the third oil pressure spring 33 and the fourth oil pressure spring 34 can absorb high-pressure suspension oil, and vice versa, so that the oil pressure of the hydraulic branch 30 is prevented from exceeding a preset oil pressure threshold value excessively, the stability of the oil pressure of the hydraulic branch 30 is kept, and the damage to parts of the hydraulic branch 30 is avoided.
In some embodiments, the hydraulic branch 30 further includes a stiffness adjustment assembly including a fifth oil pressure spring 351 and a spring stiffness switching valve 352. The fifth hydraulic spring 351 is used for communicating with the branch cylinder 31 and is electrically connected with the electronic control unit; the spring rate switching valve 352 controls the stiffness of the hydraulic branch 30 by controlling the on/off of the fifth hydraulic spring 351 and the branch cylinder 31.
Specifically, the spring rate switching valve 352 is turned back to a normally open valve, that is, the spring rate switching valve is turned off and turned on, and the spring rate switching valve 352 is turned off, and when the spring rate switching valve 352 is turned off, the suspension oil can enter or flow out of the fifth oil pressure spring 351 from the branch oil cylinder 31, at this time, the amount of expansion and contraction of the piston rod of the branch oil cylinder 31 is large, the amount of displacement variation of the vehicle in the vertical direction is small, the posture variation of the vehicle is small, and therefore the vibration of the vehicle is small, and the comfort is high.
When the stiffness of the branch cylinder 31 needs to be raised urgently, the spring stiffness switching valve 352 can be energized, the spring stiffness switching valve 352 is disconnected, the branch cylinder 31 becomes incompressible immediately, and the stiffness becomes large. At this time, the amount of extension and retraction of the piston rod of the branch cylinder 31 is small, that is, the amount of retraction of the suspension is small, and the posture of the vehicle changes greatly, but the vehicle has good moving performance.
The stiffness adjustment assembly cooperates with the damping adjustment of the damping valve 32 to adjust the vehicle to meet the optimal motion and comfort requirements of the occupant.
In some embodiments, each hydraulic branch 30 also includes a vibration sensor 36, a height sensor 37, and a pressure sensor 38. The vibration sensor 36 includes one or more for detecting vibration of the vehicle body; the height sensor 37 is used to detect the height of the suspension; the pressure sensor 38 is used to detect the oil pressure of the bypass cylinder 31.
The above sensors are exemplary, and in other embodiments, longitudinal and lateral acceleration and yaw gyro sensors may also be mounted near the center of gravity of the vehicle to acquire signals of body vibration, wheel bounce, body height and inclination.
Signals collected by all the sensors are input into the ECU, and the ECU sends out control instructions according to the input signals and a preset program to control the oil storage module 10, the balance module 20 and the corresponding hydraulic branch 30 so as to enable the four branch oil cylinders 31 to work. The height of the vehicle body is increased or decreased by increasing or decreasing suspension oil, namely, the ground clearance is automatically adjusted according to factors such as the vehicle speed and road conditions, and therefore the smoothness and the operation stability of the vehicle are improved.
In fig. 3, the working process and principle of the right rear hydraulic branch are the same as those of the left front hydraulic branch, and compared with the left front hydraulic branch, the right rear hydraulic branch has the same rigidity adjustment component, and other structures are the same and are not described again.
It is understood that "a plurality" in this disclosure means two or more, and other words are analogous. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms "first," "second," and the like, are used to describe various information and should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.
It will be further understood that the terms "central," "longitudinal," "lateral," "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used herein to denote orientations and positional relationships, based on the orientation or positional relationship shown in the drawings, and are used merely to facilitate description of the embodiments and to simplify the description, but do not indicate or imply that the referenced devices or elements must be constructed and operated in a specific orientation.
It is further understood that, unless otherwise specified, "connected" includes direct connections between the two without other elements, indirect connections between the two with other elements, and communication connections that have no physical connection but are capable of information or data transfer.
It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (11)
1. A hydraulic active suspension system, comprising:
the oil storage module comprises an oil storage tank for storing suspension oil;
the balance module is connected with the oil storage module through an oil supply main path;
the four hydraulic branches are connected with the balancing module, and the balancing module is used for balancing the oil pressure of the four hydraulic branches; and
a redundant branch circuit which is communicated with the oil storage module and is connected with the balancing module in parallel, wherein the redundant branch circuit comprises the suspension oil liquid and redundant oil liquid, the redundant oil liquid and the suspension oil liquid are non-homogeneous oil liquid which can not be mixed,
the oil storage module provides a first oil pressure to the balancing module through the suspension oil, the oil storage module provides a second oil pressure to the redundant branch through the suspension oil, and the redundant branch converts the second oil pressure of the suspension oil into a redundant oil pressure of the redundant oil;
the redundant branch circuit includes:
the first electromagnetic valve is used for controlling the on-off of the redundant branch and the oil storage module;
the pressure transmission module comprises a first cylinder body and a first piston, the first piston is positioned in the first cylinder body and divides the first cylinder body into two cavities which are not communicated, the suspension oil is contained in the cavity close to one side of the first electromagnetic valve, and the redundant oil is contained in the cavity far away from one side of the first electromagnetic valve;
after the first electromagnetic valve is opened, the oil storage module provides the second oil pressure for the redundant branch through the suspension oil, the second oil pressure pushes the first piston to move in the first cylinder body in the direction away from the first electromagnetic valve, and the suspension oil presses the redundant oil to convert the second oil pressure into redundant oil pressure;
the redundant branch circuit includes:
the steering branch road is used for being connected with a steering system; and
a brake branch road used for being connected with a brake system,
wherein the steering branch is connected in parallel with the braking branch.
2. The hydraulic active suspension system of claim 1,
the oil storage module further comprises:
the hydraulic pump is positioned in the main oil supply path and connected between the oil storage tank and the balancing module;
the first oil pressure spring is connected with the main oil supply path through a first branch path and is positioned between the hydraulic pump and the balance module; and
an oil pressure auxiliary assembly including a second solenoid valve and a second oil pressure spring, the oil pressure auxiliary assembly being connected to the main oil supply path through a second branch path and being located between the first oil pressure spring and the balancing module,
the first oil pressure spring and the second oil pressure spring are electrically connected with the electronic control unit.
3. The hydraulic active suspension system of claim 1,
the balancing module includes a central cylinder, the central cylinder including:
the balance cavity comprises a middle cavity and end cavities positioned at two ends of the middle cavity, and the volume of the middle cavity is larger than that of the end cavities;
the balance piston comprises three rigidly connected sub-pistons which are respectively positioned in the end cavity and the middle cavity and are three, and the sub-pistons divide the balance cavity into a left front cavity, a right rear cavity, a left rear cavity and a right front cavity, and the left front cavity and the right front cavity are positioned in the end cavity.
4. The hydraulic active suspension system of claim 3,
the left front cavity is adjacent to the right rear cavity, and the left rear cavity is adjacent to the right front cavity.
5. The hydraulic active suspension system of claim 3,
the balance module further comprises balance branches, one ends of the balance branches are connected with the main oil supply path, and the other ends of the balance branches are connected with the balance cavity of the central cylinder and used for transmitting the first oil pressure of the oil storage module to the central cylinder;
the balance branch comprises four parallel left front branches, right rear branches, left rear branches and right front branches, and each balance branch is provided with a third electromagnetic valve for controlling the on-off of each balance branch.
6. The hydraulic active suspension system of claim 5,
a fourth electromagnetic valve is connected between the left front branch and the right front branch; and
and a fifth electromagnetic valve is connected between the rear right branch and the rear left branch.
7. The hydraulic active suspension system of claim 3,
each hydraulic branch comprises:
the branch oil cylinder is connected with the balance cavity corresponding to the central cylinder and comprises a second cylinder body and a second piston,
the suspension oil enters and exits the second cylinder under the action of the first oil pressure so as to achieve damping and buffering of the suspension, and the height of the suspension is adjusted through the extending length of a piston rod of the second piston.
8. The hydraulic active suspension system of claim 7,
the hydraulic branch further comprises:
and the damping valve is connected between the central cylinder and the branch oil cylinder and is used for adjusting the damping of the hydraulic branch by adjusting the flow area of the suspension oil of the hydraulic branch.
9. The hydraulic active suspension system of claim 8,
the hydraulic branch circuit also comprises a third oil pressure spring and a fourth oil pressure spring;
the third oil pressure spring and the fourth oil pressure spring are respectively connected to two ends of the damping valve, and the third oil pressure spring and the fourth oil pressure spring are electrically connected with the electronic control unit.
10. The hydraulic active suspension system of claim 7,
the hydraulic branch further comprises a stiffness adjustment assembly, the stiffness adjustment assembly comprising:
the fifth oil pressure spring is used for being communicated with the branch oil cylinder and is electrically connected with the electronic control unit;
and the spring stiffness conversion valve controls the stiffness of the hydraulic branch by controlling the on-off of the fifth oil pressure spring and the branch oil cylinder.
11. The hydraulic active suspension system of claim 7,
the hydraulic branch further comprises:
a vibration sensor including one or more sensors for detecting vibration of the vehicle body;
a height sensor for detecting a height of the suspension; and
and the pressure sensor is used for detecting the oil pressure of the branch oil cylinder.
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| CN202211081083.2A CN115139725B (en) | 2022-09-06 | 2022-09-06 | Hydraulic active suspension system |
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| CN202211081083.2A CN115139725B (en) | 2022-09-06 | 2022-09-06 | Hydraulic active suspension system |
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| CN115139725A (en) | 2022-10-04 |
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