CN112572087A - Electromagnetic balance type vehicle hydraulic suspension system and control method thereof - Google Patents
Electromagnetic balance type vehicle hydraulic suspension system and control method thereof Download PDFInfo
- Publication number
- CN112572087A CN112572087A CN202011608387.0A CN202011608387A CN112572087A CN 112572087 A CN112572087 A CN 112572087A CN 202011608387 A CN202011608387 A CN 202011608387A CN 112572087 A CN112572087 A CN 112572087A
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- vehicle
- hydraulic cylinder
- electromagnetic
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- B60G17/015—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 the regulating means comprising electric or electronic elements
- B60G17/0152—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 the regulating means comprising electric or electronic elements characterised by the action on a particular type of suspension unit
-
- 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
- B60G17/015—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 the regulating means comprising electric or electronic elements
- B60G17/016—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 the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
-
- 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
- B60G17/015—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 the regulating means comprising electric or electronic elements
- B60G17/016—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 the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
- B60G17/0165—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 the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input to an external condition, e.g. rough road surface, side wind
-
- 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
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/20—Type of damper
- B60G2202/24—Fluid damper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/90—System Controller type
- B60G2800/91—Suspension Control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses an electromagnetic balance type vehicle hydraulic suspension system and a control method thereof, wherein the control method comprises the following steps: when the vehicle is started, firstly, judging a vehicle speed signal, judging vehicle body posture information and oil pressure information, such as a signal of a vehicle body inclination angle sensor and a signal of an oil pressure sensor, if a left-right inclination angle is in a set range and/or an oil pressure difference is in the set range, indicating that the vehicle is parked on a horizontal road surface; and when the vehicle is judged to be parked on a horizontal road surface, the central processing unit sends a signal to the electromagnetic switch valve, the electromagnetic switch valve is automatically closed after the vehicle is kept open for n seconds, and the oil in the hydraulic loops at the left side and the right side of the hydraulic suspension is quickly connected and separated through the electromagnetic switch valve. The opening and closing of the electromagnetic valve are controlled, so that the two hydraulic loops are communicated, the problem of pressure difference of set working pressure of the two oil loops caused by abrasion leakage and the like is solved, and the hydraulic interconnected suspension system is ensured to be in the best performance.
Description
Technical Field
The invention relates to the technical field of vehicle hydraulic suspensions, in particular to an electromagnetic balance type vehicle hydraulic suspension system and a control method thereof.
Background
With the continuous development of the automobile industry, the safety, the operating stability and the comfort of the automobile are more and more concerned by customers. The traditional suspension form of the existing mainstream is mostly matched with the transverse stabilizer bar through an elastic element, and the elastic element comprises a steel plate spring, a spiral spring or an air bag spring and the like. The stabilizer bar can only provide linear rigidity, and if certain operation stability is required to be met, the stabilizer bar needs to be thicker, so that obvious negative effects can be generated on the smoothness of the vehicle. Therefore, vehicles using leaf springs or coil springs as the elastic elements generally have the problem of poor smoothness; the vehicle using the air bag as the elastic element is particularly embodied in the vehicle, and in order to meet the requirement of smoothness, part of the operating stability is sacrificed.
Meanwhile, various types of vehicles are required to be gradually improved in the aspect of the rollover-resistant safety of the vehicle, namely the lateral stability of the vehicle. In order to improve roll stability of the vehicle, it is general to increase rigidity of the suspension or mount a stabilizer bar or the like. However, when the suspension stiffness is increased or the stabilizer bar is thickened, the roll stiffness of the suspension is increased while the roll stiffness of the suspension is negatively affected, that is, the lateral stability of the vehicle is improved while the smoothness of the vehicle is reduced, so that the lateral stability and the smoothness are compromised in the conventional suspension design, and the two cannot be optimized simultaneously. Meanwhile, once the model and the ruler parameters of the transverse stabilizer bar are determined, only fixed linear rigidity can be provided, different rigidity values cannot be provided in a self-adaptive mode according to the change of the running condition of the vehicle, and the defect further limits the improvement of the comfort of the vehicle.
Based on the problems, at present, a hydraulic suspension system is mostly adopted for improvement, and the system can improve the operation stability of the vehicle on the premise of not influencing the smoothness of the vehicle; a passive hydraulic interconnected suspension system as disclosed in chinese patent 201420153588. X; the system consists of hydraulic cylinders, hydraulic pipelines, an energy accumulator, a damping valve and other elements; the hydraulic cylinders are arranged between the four wheels and the vehicle body, one ends of the hydraulic cylinders are fixedly connected with the vehicle body, the other ends of the hydraulic cylinders are fixedly connected with the wheels, the four hydraulic cylinders are interconnected in a certain mode to form two closed hydraulic circuits, each closed circuit is provided with at least one energy accumulator, and at least one or no device for providing damping is arranged.
However, in practical engineering applications, with long-term operation of hydraulic components in the passive hydraulic interconnection suspension system, especially the sealing members used in the hydraulic components, wear occurs, resulting in a reduction in sealing performance, thereby causing oil leakage in the hydraulic components. If the wear conditions of the hydraulic elements in the two hydraulic circuits are different, the oil leakage conditions in the two circuits are possibly different, and further the two circuits generate pressure difference; the pressure difference can affect the service performance of the hydraulic interconnected suspension system; and the change of oil-liquid volume in the system caused by the change of factors such as temperature and the like can further increase the pressure difference of the two circuits, thereby causing the change of the posture of the vehicle body.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an electromagnetic balance type vehicle hydraulic suspension system and a control method thereof, which can effectively solve the problem of pressure difference of set working pressures of different oil liquid loops caused by abrasion leakage and the like and ensure that a hydraulic interconnection suspension system is in the best performance.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an electromagnetic balancing vehicle hydraulic suspension system comprising:
the hydraulic system comprises a front left hydraulic cylinder, a front right hydraulic cylinder, a rear left hydraulic cylinder and a rear right hydraulic cylinder of a suspension, wherein a rodless cavity of the front left hydraulic cylinder, a rod cavity of the front right hydraulic cylinder, a rodless cavity of the rear left hydraulic cylinder and a rod cavity of the rear right hydraulic cylinder are connected to form a hydraulic loop P1; the rod cavity of the front left hydraulic cylinder, the rodless cavity of the front right hydraulic cylinder, the rod cavity of the rear left hydraulic cylinder and the rodless cavity of the rear right hydraulic cylinder are connected to form a hydraulic loop P2;
the hydraulic circuit P1 and the hydraulic circuit P2 are connected with an accumulator;
the electromagnetic switch valve is used for realizing the intercommunication of the two hydraulic circuits and is arranged between the hydraulic circuit P1 and the hydraulic circuit P2;
and the central processing unit is used for controlling the electromagnetic switch valve to work and is connected with the electromagnetic switch valve.
The vehicle body posture sensor is connected with the central processing unit.
And each hydraulic loop is provided with an oil pressure sensor which is connected with the central processing unit.
The port corresponding to each hydraulic cylinder and the part between the energy accumulator and the corresponding hydraulic loop are respectively provided with a damping valve structure, and the damping valve structure is a damping valve with fixed resistance or an adjustable damping valve; if the damping valves are adjustable, the adjustable damping valves are connected with the central processing unit.
The electromagnetic switch valve is a switch type electromagnetic valve, and the electromagnetic switch valve is an electromagnetic needle valve or an electromagnetic slide valve or an electromagnetic rotary valve.
The hydraulic cylinder is positioned between wheels and a vehicle body of the vehicle, the elastic element is arranged corresponding to the hydraulic cylinder, and the hydraulic cylinder and the elastic element are connected in parallel to work and bear the vehicle body.
The electromagnetic switch valve is a normally closed valve.
The vehicle body attitude sensors are more than two and are respectively arranged on two sides of the vehicle.
The vehicle body attitude sensor is a displacement sensor or a height sensor or a vehicle body inclination angle sensor.
A control method of a hydraulic suspension system of an electromagnetic balance type vehicle comprises the following steps: .
S1: when the vehicle is started, firstly, judging a vehicle speed signal, judging vehicle body posture information and oil pressure information, such as a signal of a vehicle body inclination angle sensor and a signal of an oil pressure sensor, if a left-right inclination angle is in a set range and/or an oil pressure difference is in the set range, indicating that the vehicle is parked on a horizontal road surface;
s2: and when the vehicle is judged to be parked on a horizontal road surface, the central processing unit sends a signal to the electromagnetic switch valve, the electromagnetic switch valve is automatically closed after the vehicle is kept open for n seconds, and the oil in the hydraulic loops at the left side and the right side of the hydraulic suspension is quickly connected and separated through the electromagnetic switch valve.
Compared with the prior art, the invention has the following advantages:
the electromagnetic balance type vehicle hydraulic suspension system and the control method thereof are reasonable in design, the switch type electromagnetic valve is arranged between the hydraulic suspension loops on the two sides, and meanwhile, the vehicle body attitude sensor and the central processing unit are additionally arranged, so that the opening and closing of the electromagnetic valve can be controlled according to vehicle body attitude signals under specific working conditions, the two hydraulic loops are communicated, the problem of pressure difference of set working pressure of the two oil loops caused by abrasion leakage and the like is solved, and the hydraulic interconnected suspension system is ensured to be in the best performance.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of another embodiment of the present invention.
FIG. 3 is a logic diagram of the open/close control of the solenoid valve according to the present invention.
Fig. 4 is a control logic diagram of the adjustable damping valve in the embodiment of fig. 2.
In the figure:
c1: front left hydraulic cylinder
C2: front right hydraulic cylinder
C3: rear left hydraulic cylinder
C4: rear right hydraulic cylinder
D11, D12: upper cavity damping valve of front left hydraulic cylinder and lower cavity damping valve of front left hydraulic cylinder
D21, D22: upper cavity damping valve of front right hydraulic cylinder and lower cavity damping valve of front right hydraulic cylinder
D31, D32: upper cavity damping valve of rear left hydraulic cylinder and lower cavity damping valve of rear left hydraulic cylinder
D41, D42: upper cavity damping valve of rear right hydraulic cylinder and lower cavity damping valve of rear right hydraulic cylinder
Da1, Da 2: damping valve of left side energy accumulator and damping valve of right side energy accumulator
A1, A2: left side energy storage ware, right side energy storage ware
p1, p 2: left side hydraulic circuit, right side hydraulic circuit
S1, S2: left side return circuit oil pressure sensor, right side return circuit oil pressure sensor
V: electromagnetic switch valve
E: central processing unit
S: vehicle body attitude sensor
d11, d 12: adjustable damping valve for upper cavity and lower cavity of front left hydraulic cylinder
d21, d 22: adjustable damping valve for upper cavity and lower cavity of front right hydraulic cylinder
d31, d 32: adjustable damping valve for upper cavity and lower cavity of rear left hydraulic cylinder
d41, d 42: damping valve with adjustable upper cavity and lower cavity of rear right hydraulic cylinder
da1, da 2: the left side energy storage device adjustable damping valve and the right side energy storage device adjustable damping valve.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
As shown in fig. 1 to 4, the hydraulic suspension system of the electromagnetic balance type vehicle comprises a front left hydraulic cylinder, a front right hydraulic cylinder, a rear left hydraulic cylinder, a rear right hydraulic cylinder, an energy accumulator, an electromagnetic switch valve, a vehicle body attitude sensor and a central processing unit.
The rodless cavity of the front left hydraulic cylinder, the rod cavity of the front right hydraulic cylinder, the rodless cavity of the rear left hydraulic cylinder and the rod cavity of the rear right hydraulic cylinder are connected to form a hydraulic loop P1; the rod cavity of the front left hydraulic cylinder, the rodless cavity of the front right hydraulic cylinder, the rod cavity of the rear left hydraulic cylinder and the rodless cavity of the rear right hydraulic cylinder are connected to form a hydraulic loop P2; an accumulator is connected to both the hydraulic circuit P1 and the hydraulic circuit P2.
The electromagnetic switch valve is used for realizing the intercommunication of the two hydraulic circuits and is arranged between the hydraulic circuit P1 and the hydraulic circuit P2; the central processing unit is used for controlling the work of the electromagnetic switch valve and is connected with the electromagnetic switch valve; the vehicle body attitude sensor is used for detecting the vehicle attitude and is connected with the central processing unit. And each hydraulic loop is provided with an oil pressure sensor which is connected with the central processing unit.
According to the invention, the switch type electromagnetic valve is arranged between the hydraulic suspension loops at two sides, and the vehicle body attitude sensor and the central processing unit are additionally arranged, so that the opening and closing of the electromagnetic valve can be controlled according to vehicle body attitude signals under a specific working condition, the two hydraulic loops are communicated, the problem of pressure difference of set working pressure of the two oil loops caused by abrasion leakage and the like is solved, and the hydraulic interconnected suspension system is ensured to be in the best performance.
The hydraulic cylinder is an actuating element in the scheme and comprises an upper connecting part, a lower connecting part, at least two oil ports, a cylinder barrel and a piston rod. The hydraulic cylinder is positioned between the wheel and the vehicle body, one connecting part is fixedly connected with the vehicle body, and the other connecting part is fixedly connected with the wheel. The hydraulic cylinder can partially bear the load of the vehicle body, and at the moment, the hydraulic cylinder and the elastic element work in parallel; the hydraulic cylinder can also bear the load of the vehicle body completely, and at the moment, the hydraulic cylinder and the hydraulic circuit system containing the energy accumulator replace elastic elements, so that elastic elements such as leaf springs, spiral springs or air bags are not needed. However, in this case, the load-bearing capacity of the hydraulic cylinder is required to be high. In the scheme, the hydraulic cylinder and the elastic element work in parallel as an example. When the hydraulic cylinder is matched with a vehicle, the number of the hydraulic cylinders is matched according to the structure and the performance requirement of the vehicle suspension. The common arrangement form of the two front and two rear hydraulic cylinders of the two-axle vehicle is taken as an example for explanation in the scheme, and the analogy can be carried out on the system of the multi-axle vehicle.
The upper and lower connecting parts of the hydraulic cylinder can be in the form of lifting lugs, and can also be in the form of fork arms or supporting columns. The hydraulic cylinder at least comprises two oil ports which are respectively communicated with the upper cavity and the lower cavity of the hydraulic cylinder. The cylinder barrel of the hydraulic cylinder is fixedly connected with the upper end connecting part in a welding, threaded or other connection mode. The piston rod is provided with a piston at the upper part, is positioned in the cylinder barrel, and divides the cylinder barrel into two cavities, namely a rodless cavity and a rod cavity, which can be called as an upper cavity and a lower cavity according to the demonstration example in the present case. The middle part and the cylinder barrel are sealed by a sealing piece, and the sealing piece slides along the inner wall of the cylinder barrel. The lower part of the piston rod is fixedly connected with the connecting part of the lower end.
The damping valve is arranged on a single oil port or a plurality of oil ports of the hydraulic cylinder, and provides the damping force for vertical shock absorption required by the system. According to the requirement, the damping valve can also be arranged at the outlet of the energy accumulator to provide damping force for the front pipeline of the energy accumulator, and the size of the side-tipping damping force can be adjusted. The damping valve can be a sheet valve or a small hole valve with fixed damping force, and can also be an adjustable damping valve with adjustable flow; if the damping valve is an adjustable damping valve, each adjustable damping valve is connected with the central processing unit. The adjustable damping valve can be a single valve to realize flow control, or can be a valve system combination, such as a combination of a thin plate valve and a small hole valve with controllable flow, or a combination of a small hole valve with fixed flow and a small hole valve with controllable flow.
The energy accumulator is arranged in the two loops and can be in a diaphragm type, a bag type, a piston type, a metal bellows type or other forms, and the energy accumulator is within the scope of the scheme as long as the functions of storing gas at one end and storing liquid at the other end can be realized. The gas in the accumulator is inert gas, such as nitrogen, etc. The accumulator in each circuit may be one or more, as desired. The present disclosure will be described with reference to an accumulator in each circuit.
The hydraulic pipeline and the hydraulic pipe joint provide an oil liquid circulation channel, and certain pressure bearing capacity and oil liquid sealing capacity need to be guaranteed. The hydraulic pipeline and the hydraulic pipe joint, and the hydraulic cylinder, the energy accumulator and the damping valve can be in threaded connection, flange connection or welding, and the protection range of the scheme is provided as long as the oil leakage and seepage situation is avoided after connection. The sealing mode can adopt a common O-shaped ring seal, a gasket seal or a combined gasket seal, and the sealing mode is within the protection scope of the scheme as long as the sealing effect can be achieved.
The electromagnetic switch valve can be a needle valve, a slide valve or a rotary valve, and the like, and is within the protection range of the scheme as long as the on-off of a connecting loop can be realized. The electromagnetic switch valve is controlled by the central processing unit and is electrified. The electromagnetic switch valve is a normally closed valve, and both the electromagnetic switch valve and the electromagnetic switch valve are in a closed state in the running process of the vehicle, and at the moment, the two hydraulic circuits are disconnected. The two hydraulic circuits are communicated and automatically closed after being communicated for a certain time according to the setting in the control logic.
The central processing unit integrates a control strategy of the electromagnetic switch valve and a control strategy of the adjustable damping valve, and the opening and closing of the electromagnetic switch valve or the adjustment of the damping aperture of the adjustable damping valve are realized by receiving signals transmitted by the vehicle sensor and sending instructions to the electromagnetic switch valve and the adjustable damping valve according to the control strategies.
The vehicle body attitude sensor can be a displacement sensor, a height sensor or a vehicle body inclination angle sensor, and is within the protection range of the scheme as long as a position change signal of the vehicle body relative to the initial horizontal position can be obtained. In general, a vehicle is provided with various sensors, and at the moment, only a required vehicle body posture signal needs to be led out from a CAN bus to be processed in a central processing mode. If the vehicle does not comprise the sensor, the sensor can be additionally arranged on the vehicle to acquire a required signal. The sensor has mature technology, low price and easy application. The present disclosure will be described with reference to a tilt sensor as an example.
The oil pressure sensors are respectively arranged in the two hydraulic system loops and used for monitoring the real-time pressure of the two hydraulic system loops.
As shown in fig. 1, a schematic connection diagram of an electromagnetic switch type hydraulic suspension system matched with a vehicle is shown. The upper cavity of the hydraulic cylinder on the left side of the front shaft is connected with the lower cavity of the hydraulic cylinder on the right side of the front shaft, and the lower cavity of the hydraulic cylinder on the left side of the front shaft is connected with the upper cavity of the hydraulic cylinder on the right side of the front shaft; the upper cavity of the hydraulic cylinder on the left side of the rear shaft is connected with the lower cavity of the hydraulic cylinder on the right side of the rear shaft, and the lower cavity of the hydraulic cylinder on the left side of the rear shaft is connected with the upper cavity of the hydraulic cylinder on the right side of the rear shaft; the upper cavity is connected with the upper cavity, and the lower cavity is connected with the lower cavity. Thereby forming two hydraulic circuits.
In order to meet the requirements of compatibility of smoothness and operation stability of a vehicle, after the hydraulic suspension system is installed, the rigidity of a leaf spring or an air bag which is connected with a hydraulic cylinder in parallel to work can be properly reduced, and a transverse stabilizer bar can be removed. At this time, the hydraulic suspension system can be relied on to provide part of the vertical stiffness required by the whole vehicle, and the roll stiffness which plays a main role. Meanwhile, because the hydraulic suspension system in the scheme has the oil hydraulic pressure which changes in real time along with the posture and road conditions of the vehicle body, the real-time change of the vertical rigidity and the roll rigidity can be realized.
When the vehicle runs on a flat road surface, a piston rod of the hydraulic cylinder is in a high-frequency small-amplitude fluctuation state, oil flows through the damping valve, the quantity of the oil entering and exiting the energy accumulator is small, the roll stiffness provided by the system is small at the moment, part of vertical stiffness is mainly provided, vertical vibration can be quickly absorbed by the damping valve and a bushing at the joint of the hydraulic cylinder and the vehicle body, and the stable posture and the good smoothness of the vehicle body are ensured.
When the vehicle turns or is in working conditions such as quick lane change and the like, the piston rod of the hydraulic cylinder on one side is compressed, the piston rod of the hydraulic cylinder on the other side is stretched, the piston rod is in a low-frequency large-amplitude motion state, and a large amount of oil flows through the damping valve and enters and exits the energy accumulator. The accumulator gas in the hydraulic circuit on the side where the piston rod is compressed, the pressure is increased, the oil pressure of the circuit is increased, and the force for inhibiting the piston rod from being compressed is generated; the accumulator in the hydraulic circuit on the side where the piston rod is stretched expands, the pressure decreases, the circuit hydraulic pressure decreases, and a force that suppresses the stretching of the piston rod is generated. The forces on both sides form a moment against the roll of the vehicle body, which is directed to reduce the roll angle of the vehicle body and keep the posture of the vehicle body stable. The larger the vehicle turning width, the larger the force generated on one side, and the larger the moment resisting the roll of the side body. Namely, the hydraulic system provides the required roll moment in real time according to the vehicle condition, and self-adaptive adjustment is realized.
The control method of the system comprises the following steps:
in the running process, the electromagnetic switch valve is in a normally closed state, and the two hydraulic circuits are disconnected. When the vehicle is started, firstly, a vehicle speed signal is judged, when the vehicle speed signal is zero, vehicle body posture information and oil pressure information, such as a signal of a vehicle body inclination angle sensor and a signal of an oil pressure sensor, are judged, if a left and right inclination angle is within a set range and/or an oil pressure difference is within the set range, the vehicle is stopped on a horizontal road surface, a central processing unit sends a signal to an electromagnetic switch valve, and the electromagnetic switch valve is automatically closed after being kept open for n seconds. The quick connection and the separation of the oil in the two hydraulic loops are realized.
Preferred specific examples are:
fig. 1 is a preferred embodiment of the present invention, specifically:
the hydraulic suspension system comprises a front left hydraulic cylinder C1, a front right hydraulic cylinder C2, a rear left hydraulic cylinder C3, a rear right hydraulic cylinder C4, a left accumulator A1, a right accumulator A2, damping valves D11, D12, D21, D22, D31, D32, D41 and D42 in a pipeline, damping valves Da1 and Da2 in front of the accumulators, oil pressure sensors S1 and S2 in a system circuit, an electromagnetic switch valve V, a central processing unit E and a sensor S. A left hydraulic circuit p1 and a right hydraulic circuit p 2.
When the vehicle is static and is positioned on a straight road, the quick connection and disconnection of oil in the two hydraulic loops of the hydraulic suspension system are realized, so that the oil hydraulic pressure difference in the two hydraulic loops is eliminated. The specific control logic is as follows: when the vehicle starts, a starting signal is transmitted into the central processing unit, then the vehicle speed is judged, and when the vehicle speed is not zero, the electromagnetic valve is kept closed, and the central processing unit can not send an instruction. When the speed is zero, the inclination angle of the vehicle body and the signals of the oil pressure sensors in the system are judged, the left and right inclination angles of the vehicle body are larger than a set value alpha, or the pressure difference of the oil pressure sensors on two sides is larger than a set value beta, the electromagnetic valve is kept closed, and at the moment, the central processing unit does not send an instruction. When the inclination angle of the vehicle body is smaller than or equal to a set value alpha and the oil pressure difference between the two sides is smaller than or equal to a set value beta, the central processing unit sends an instruction to open the electromagnetic valve. And then, starting time counting, and when the opening time is increased from 0 to be less than a set value m and the vehicle speed is kept to be zero, keeping the electromagnetic valve in an opening state and not sending an instruction by the central processing unit. If the timing time is less than the set value m and the vehicle speed is not zero, the central processing unit sends an instruction and the electromagnetic valve is closed. When the timing time reaches a set value m, the central processing unit sends out an instruction to close the electromagnetic valve.
When the vehicle is not at rest or/and is not positioned on a straight road surface, the electromagnetic valve is in a normally closed state, and two circuits of the hydraulic suspension system are disconnected. At the moment, under the excitation of an external road surface, the hydraulic suspension system can generate corresponding rigidity and damping, and the requirements of operation stability and comfort are met.
In this case, for example, when the vehicle is turned right, the vehicle body is inclined to the left side due to the influence of the centrifugal force and the vehicle inertia. At this time, the relative distance between the left vehicle body and the wheels of the vehicle decreases, the relative distance between the right vehicle body and the wheels increases, that is, the left elastic element and the hydraulic cylinder are compressed, and the right elastic element and the hydraulic cylinder are stretched. The piston rod of the left hydraulic cylinder moves upwards, the volume of the upper cavity is reduced, and oil flows out of the upper cavity, passes through the hydraulic circuit and flows into the left circuit energy accumulator; meanwhile, the piston rod of the hydraulic cylinder on the right moves downwards, the volume of the lower cavity is reduced, and oil flows out of the lower cavity, passes through the hydraulic circuit and flows into the energy accumulator of the loop on the left side. The oil and liquid volume in the left loop accumulator increases, the gas is compressed, and the gas pressure increases, resulting in an increase in the left loop oil and liquid pressure. Accordingly, the pressure in the left hydraulic cylinder upper chamber and the right hydraulic cylinder lower chamber connected in the left circuit increases, generating a force against the continued movement of the piston rod.
Meanwhile, the piston rod of the hydraulic cylinder on the left side moves upwards, and the piston rod of the hydraulic cylinder on the right side moves downwards, so that the volumes of the lower cavity of the hydraulic cylinder on the left side and the upper cavity of the hydraulic cylinder on the right side are increased, and oil in a loop on the right side flows out of the energy accumulator of the loop on the right side and is supplemented to the lower cavity of the hydraulic cylinder on the left side and the upper cavity of the hydraulic cylinder. Causing its pressure to rise, creating a force that resists continued movement of the piston rod.
The forces generated by the two loops form moment, and the roll angle of the car body is reduced and the posture of the car body is kept stable under the action of the hydraulic cylinder and the car body.
In addition, when the vehicle runs on a flat random road surface, a piston rod of the hydraulic cylinder is in a high-frequency small-amplitude fluctuation state, oil flows through the damping valve, the quantity of the oil entering and exiting the energy accumulator is small, the roll stiffness provided by the system is small at the moment, partial vertical stiffness is mainly provided, vertical vibration can be quickly absorbed by the damping valve and a bushing at the joint of the hydraulic cylinder and the vehicle body, and the stable vehicle body posture and the good smoothness of the passenger vehicle are ensured.
Fig. 2 is another preferred embodiment of the present invention, specifically:
unlike fig. 1, the damping valve in this embodiment is an adjustable damping valve. Fig. 4 shows an implementation strategy of the adjustable damping valve. The adjustable damping valve is controlled by the central processing unit, the sensor receives signals according to different driving road conditions and transmits the signals to the central processing unit, and the central processing unit selects an execution strategy after analysis, transmits the signals to the adjustable damping valve of the hydraulic suspension system, and adjusts the flow in a pipeline system, so that damping adjustment is realized.
The sensor signal CAN be obtained from the CAN bus of the whole vehicle, or a sensor is additionally arranged. The adjustable damping valve is used, so that the riding comfort can be further improved, and the following performance, the passing performance and the like of the tail of the vehicle are optimized.
The above-mentioned features are merely for describing preferred embodiments of the present invention and may be arbitrarily combined to form a plurality of embodiments of the present invention.
The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (10)
1. The utility model provides an electromagnetism balanced type vehicle hydraulic suspension system which characterized in that: the method comprises the following steps:
the hydraulic system comprises a front left hydraulic cylinder, a front right hydraulic cylinder, a rear left hydraulic cylinder and a rear right hydraulic cylinder of a suspension, wherein a rodless cavity of the front left hydraulic cylinder, a rod cavity of the front right hydraulic cylinder, a rodless cavity of the rear left hydraulic cylinder and a rod cavity of the rear right hydraulic cylinder are connected to form a hydraulic loop P1; the rod cavity of the front left hydraulic cylinder, the rodless cavity of the front right hydraulic cylinder, the rod cavity of the rear left hydraulic cylinder and the rodless cavity of the rear right hydraulic cylinder are connected to form a hydraulic loop P2;
the hydraulic circuit P1 and the hydraulic circuit P2 are connected with an accumulator;
the electromagnetic switch valve is used for realizing the intercommunication of the two hydraulic circuits and is arranged between the hydraulic circuit P1 and the hydraulic circuit P2;
and the central processing unit is used for controlling the electromagnetic switch valve to work and is connected with the electromagnetic switch valve.
2. The electromagnetic balancing vehicle hydraulic suspension system of claim 1, wherein: the vehicle body posture sensor is connected with the central processing unit.
3. The electromagnetic balancing vehicle hydraulic suspension system of claim 1, wherein: and each hydraulic loop is provided with an oil pressure sensor which is connected with the central processing unit.
4. The electromagnetic balancing vehicle hydraulic suspension system of claim 1, wherein: the port corresponding to each hydraulic cylinder and the part between the energy accumulator and the corresponding hydraulic loop are respectively provided with a damping valve structure, and the damping valve structure is a damping valve with fixed resistance or an adjustable damping valve; if the damping valves are adjustable, the adjustable damping valves are connected with the central processing unit.
5. The electromagnetic balancing vehicle hydraulic suspension system of claim 1, wherein: the electromagnetic switch valve is a switch type electromagnetic valve, and the electromagnetic switch valve is an electromagnetic needle valve or an electromagnetic slide valve or an electromagnetic rotary valve.
6. The electromagnetic balancing vehicle hydraulic suspension system of claim 1, wherein: the hydraulic cylinder is positioned between wheels and a vehicle body of the vehicle, the elastic element is arranged corresponding to the hydraulic cylinder, and the hydraulic cylinder and the elastic element are connected in parallel to work and bear the vehicle body.
7. The electromagnetic balancing vehicle hydraulic suspension system of claim 1, wherein: the electromagnetic switch valve is a normally closed valve.
8. The electromagnetic balancing vehicle hydraulic suspension system of claim 2, wherein: the vehicle body attitude sensors are more than two and are respectively arranged on two sides of the vehicle.
9. The electromagnetic balancing vehicle hydraulic suspension system of claim 2, wherein: the vehicle body attitude sensor is a displacement sensor or a height sensor or a vehicle body inclination angle sensor.
10. A control method of an electromagnetic balance type vehicle hydraulic suspension system is characterized in that: the control method comprises the following steps: .
S1: when the vehicle is started, firstly, judging a vehicle speed signal, judging vehicle body posture information and oil pressure information, such as a signal of a vehicle body inclination angle sensor and a signal of an oil pressure sensor, if a left-right inclination angle is in a set range and/or an oil pressure difference is in the set range, indicating that the vehicle is parked on a horizontal road surface;
s2: and when the vehicle is judged to be parked on a horizontal road surface, the central processing unit sends a signal to the electromagnetic switch valve, the electromagnetic switch valve is automatically closed after the vehicle is kept open for n seconds, and the oil in the hydraulic loops at the left side and the right side of the hydraulic suspension is quickly connected and separated through the electromagnetic switch valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608387.0A CN112572087A (en) | 2020-12-30 | 2020-12-30 | Electromagnetic balance type vehicle hydraulic suspension system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608387.0A CN112572087A (en) | 2020-12-30 | 2020-12-30 | Electromagnetic balance type vehicle hydraulic suspension system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112572087A true CN112572087A (en) | 2021-03-30 |
Family
ID=75144423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011608387.0A Pending CN112572087A (en) | 2020-12-30 | 2020-12-30 | Electromagnetic balance type vehicle hydraulic suspension system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112572087A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113895198A (en) * | 2021-10-11 | 2022-01-07 | 北京汽车集团越野车有限公司 | Gas spring interconnected suspension system and vehicle with same |
| CN115447334A (en) * | 2022-11-04 | 2022-12-09 | 万向钱潮股份公司 | Multi-axle vehicle damping system and vehicle |
-
2020
- 2020-12-30 CN CN202011608387.0A patent/CN112572087A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113895198A (en) * | 2021-10-11 | 2022-01-07 | 北京汽车集团越野车有限公司 | Gas spring interconnected suspension system and vehicle with same |
| CN115447334A (en) * | 2022-11-04 | 2022-12-09 | 万向钱潮股份公司 | Multi-axle vehicle damping system and vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214057159U (en) | Electromagnetic balance type vehicle hydraulic suspension system | |
| CN103661748B (en) | Vehicle-height adjustment apparatus of motorcycle | |
| EP0190944B2 (en) | Vehicle suspension arrangements | |
| CN1680126B (en) | Vehicle suspension system | |
| CN112572087A (en) | Electromagnetic balance type vehicle hydraulic suspension system and control method thereof | |
| JPH0419210A (en) | Oscillation damping device for vehicle | |
| US20140232082A1 (en) | Suspension system | |
| CN111391602A (en) | Passenger car suspension system | |
| US8434771B2 (en) | Piston-type actuator and static fluid damper and vehicles including same | |
| JPH0295911A (en) | Control device for automobile active suspension | |
| CN109501545B (en) | Air suspension, vehicle with air suspension and method for installing air suspension | |
| JPH0325014A (en) | Method for controlling active suspension for vehicle | |
| CN106427455A (en) | Vehicle suspension and vehicle | |
| CN104245372A (en) | Suspension device | |
| CN109501544B (en) | Air suspension and vehicle provided with same | |
| CN107953736B (en) | Vehicle and interconnection type air damper module and air damper for suspension thereof | |
| JPH048619A (en) | Car stabilizer device | |
| CN212124779U (en) | Passenger car suspension system | |
| CN109515104B (en) | Hub-driven electric automobile air suspension system with multiple layers of additional air chambers | |
| JPH04100724A (en) | Active stabilizer for vehicle | |
| JPH05193331A (en) | Oscillation damping device for vehicle | |
| CN205149448U (en) | Binary channels lateral rigidity initiative oil gas suspension | |
| JP2020001489A (en) | Suspension device | |
| CN217145565U (en) | Hydraulic suspension system and automobile | |
| CN219339130U (en) | Full-active suspension and system comprising same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |