Adjustable hydro-pneumatic suspension test model based on Simscape

Abstract

The utility model relates to an adjustable hydro-pneumatic suspension test model based on Simscape, and belongs to the technical field of automobile control, test and hydraulic transmission integration. The adjustable hydro-pneumatic suspension test model comprises a hydraulic power assembly, a main valve assembly, four sets of control solenoid valve groups, four sets of hydro-pneumatic spring assemblies and an energy accumulator assembly, the output end of the hydraulic power assembly is connected with the main valve assembly, and the four sets of control solenoid valve groups are connected to the output end of the main valve assembly in parallel. And the four sets of hydro-pneumatic spring assemblies are correspondingly connected with the four sets of control electromagnetic valve groups respectively. The adjustable hydro-pneumatic suspension test model designed by the utility model can simulate the control process of a vehicle hydro-pneumatic suspension, and is used for the experimental test of a vehicle hydro-pneumatic suspension system.

Description

Technical Field

[0001] The utility model relates to the comprehensive technical field of automobile control, testing and hydraulic transmission, and in particular to an adjustable oil-gas suspension test model based on Simscape. Background Art

[0002] Adjustable oil-gas suspension is different from traditional coil spring suspension and leaf spring suspension. It can adjust the height or posture of the vehicle body according to the working conditions, improving the passability and environmental adaptability of the off-road vehicle chassis. As a complex control system integrating electromechanical and hydraulic systems, verifying the feasibility of the suspension system function and control strategy has become an important topic in this technical field, and the type of test system used directly affects the test cost, implementation difficulty and test effect.

[0003] At present, closed-loop simulation testing is often carried out by establishing a hydro-pneumatic suspension dynamics model or a complex hydraulic system test bench as the test object. The former requires a solid foundation in vehicle dynamics and a complex model. It is often implemented by simplifying parameters or de-parameterization, which is often far from the actual vehicle and cannot achieve the ideal simulation test effect and performance indicators. The latter requires a hydraulic bench system based on hydraulic principles that is exactly the same as the actual vehicle. Although it can meet the test requirements, the bench system is very complex, has a high failure rate, and poor reliability. Once the system fails or changes, it will take a lot of time and manpower or reinvest funds, which is not cost-effective, which is not allowed for control system testing. Summary of the invention

[0004] In order to solve the problems in the prior art, this utility model patent designs an adjustable oil-gas suspension test model based on Simscape, which can establish a control system test object that is exactly the same as the actual vehicle, so as to solve the problem of the lack of reliable automobile suspension oil-gas control system test equipment in the prior art.

[0005] The technical solution adopted by the utility model is: the adjustable oil-gas suspension test model includes a hydraulic power component, a main valve component, four sets of control solenoid valve groups, four sets of oil-gas spring components and an accumulator component, the output end of the hydraulic power component is connected to the main valve component, the four sets of control solenoid valve groups are connected in parallel to the output end of the main valve component, and the four sets of oil-gas spring components are correspondingly connected to the four sets of control solenoid valve groups and the accumulator component.

[0006] Furthermore, the hydraulic power assembly includes an oil tank and a hydraulic pump, the input end of the hydraulic pump is connected to the oil tank, and the output end is connected to the main valve assembly. An overflow valve is connected to the connecting pipeline between the hydraulic pump and the main valve assembly, and the output end of the overflow valve is connected to the oil tank.

[0007] Furthermore, the main valve assembly is a two-position three-way valve, provided with an oil inlet, an oil outlet and an oil return port, the oil inlet is connected to a hydraulic pump, the oil outlet is connected to four sets of control solenoid valve groups in parallel, and the oil return port is connected to an oil tank.

[0008] Furthermore, the four sets of control solenoid valve groups have the same composition, namely a left front control solenoid valve group, a right front control solenoid valve group, a left rear control solenoid valve group and a right rear control solenoid valve group. The control solenoid valve group includes an oil inlet valve, an oil return valve, a one-way valve and a locking valve. The oil outlet end of the oil inlet valve is connected in series with the oil inlet end of the one-way valve, the oil inlet ends of the oil inlet valves of the four sets of control solenoid valve groups are connected in parallel to the oil outlet of the main valve assembly, the oil outlet end of the one-way valve and the oil inlet end of the locking valve are connected in parallel to the oil supply pipeline of the corresponding oil-gas spring assembly, the oil outlet end of the locking valve is connected to the oil return valve, and the oil outlet end of the oil return valve is connected to the oil tank.

[0009] Furthermore, the four sets of control solenoid valve groups have the same composition, namely, a left front control solenoid valve group, a right front control solenoid valve group, a left rear control solenoid valve group and a right rear control solenoid valve group. The control solenoid valve groups include an oil inlet valve, an oil return valve, a one-way valve and a locking valve. One end of the oil inlet valve is connected in series with the one-way valve, and the other end of the oil inlet valve of the four sets of control solenoid valve groups is connected in parallel to the oil outlet of the main valve assembly. One end of the one-way valve and the locking valve are connected in parallel to the oil supply pipeline of the corresponding oil-gas spring assembly. The other end of the locking valve is connected in series with the oil return valve, and the oil return valve is connected to the oil tank.

[0010] Furthermore, the four sets of oil-gas spring assemblies are respectively connected to accumulator assemblies, and the accumulator assembly is provided with two sets of parallel solenoid valves and accumulators, and the solenoid valves and accumulators are connected in series.

[0011] Furthermore, the two piston chambers of each of the bidirectional hydraulic cylinders are respectively connected to pressure sensors.

[0012] Furthermore, a displacement sensor is provided at the piston rod of each of the bidirectional hydraulic cylinders.

[0013] Furthermore, the left front control solenoid valve group is connected to the left front oil-gas spring assembly and cross-connected to the right front oil-gas spring assembly, the right front control solenoid valve group is connected to the right front oil-gas spring assembly and cross-connected to the left front oil-gas spring assembly, the left rear control solenoid valve group is connected to the left rear oil-gas spring assembly and cross-connected to the right rear oil-gas spring assembly, and the right rear control solenoid valve group is connected to the right rear oil-gas spring assembly and cross-connected to the left rear oil-gas spring assembly.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects:

[0015] First, the Simscape physical model system is an existing hydraulic transmission and control system construction tool. The utility model uses the Simscape physical modeling tool chain in the existing Matlab / Simulink software to select appropriate physical components in accordance with the same working principles and functions as the physical system, and establishes a reliable adjustable oil-gas suspension test model through parameter configuration, port configuration and port connection of each component.

[0016] Second, the test model provided by this utility model patent solves the time-consuming and labor-intensive pain point that the transmission vehicle electronic control test system needs to establish a complex dynamic model or build a complex test bench. A new system is used to implement model-in-the-loop testing and hardware-in-the-loop closed-loop testing, which improves development efficiency.

[0017] Third, the main valve assembly of the test model provided by the utility model patent adopts a two-position three-way valve, which can realize the overall control of the test model, and is provided with an oil return port. When all control valve assemblies are closed, the hydraulic oil from the hydraulic power assembly can be returned to the oil tank to avoid damage to the main valve assembly and the power assembly due to pressure build-up;

[0018] Fourth, the output end pipeline of the hydraulic pump of the test model provided by the utility model patent is provided with an overflow valve. When the oil delivery pressure of the hydraulic pump exceeds the set output pressure of the main valve assembly, the excess hydraulic oil can be returned to the oil tank to play the role of overflow and pressure reduction, thereby avoiding damage to the hydraulic pump and the main valve assembly caused by overpressure;

[0019] Fifth, the test model provided by the utility model patent is equipped with four sets of control solenoid valve groups to control four sets of oil-gas spring assemblies respectively, which can realize the overall and independent test of the four sets of oil-gas spring assemblies. Each set of oil-gas spring assemblies is equipped with two sets of sub-assemblies, which can realize the simulation test of vehicles with 8*8 oil-gas suspension systems, and is equipped with a limit assembly to simulate the vehicle load, so that the test results are more comprehensive and reliable;

[0020] Sixth, each set of oil-gas spring assembly is equipped with an accumulator assembly, which further enriches the test items of the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the adjustable oil-gas suspension test model based on Simscape.

[0022] Figure 2 This is a schematic diagram of the composition of the oil and gas spring subassembly

[0023] In the figure, 1 is an oil tank, 2 is a hydraulic pump, 3 is a relief valve, 4 is a main valve assembly, 5 is a left front control solenoid valve group, 6 is a right front control solenoid valve group, 7 is a left rear control solenoid valve group, 8 is a right rear control solenoid valve group, 9 is a left front oil and gas spring assembly, 10 is a right front oil and gas spring assembly, 11 is a left rear oil and gas spring assembly, 12 is a right rear oil and gas spring assembly, 13 is a left front accumulator assembly, 14 is a right front accumulator assembly, 15 is a left rear accumulator assembly, 16 is a right rear accumulator assembly, 101 is an oil inlet valve, 102 is an oil return valve, 103 is a one-way valve, 104 is a locking valve, 201 is a first oil and gas spring subassembly, 202 is a second oil and gas spring subassembly, 203 is a two-way acting hydraulic cylinder, 204 is a limit mechanism, 205 is a displacement sensor, 206 is a first pressure sensor, 207 is a second pressure sensor, 301 is a first solenoid valve, 302 is a second solenoid valve, 303 is a first accumulator, and 304 is a second accumulator. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the utility model are clearly and completely described, and the described embodiments are only embodiments of a part of the invention, not all of it. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0025] like Figure 1 As shown, the utility model patent designs an embodiment of an adjustable oil-gas suspension test model based on Simscape. In this embodiment, the adjustable oil-gas suspension test model includes a hydraulic power assembly, a main valve assembly 4, four sets of control solenoid valve groups and four sets of oil-gas spring assemblies. The output end of the hydraulic power assembly is connected to the main valve assembly 4, the four sets of control solenoid valve groups are connected in parallel to the output end of the main valve assembly 4, and the four sets of oil-gas spring assemblies are connected to the four sets of control solenoid valve groups respectively.

[0026] The hydraulic power assembly includes an oil tank 1 and a hydraulic pump 2. The hydraulic pump 2 is a fixed flow hydraulic pump that can provide a controllable hydraulic oil flow for the test model. In the figure, its T port is the input port, connected to the oil tank 1, the P port is the output port, connected to the main valve assembly 4, and the S port is the flow control port, which can control the output flow of the hydraulic pump, thereby controlling the lifting speed of the suspension, i.e., the oil-gas spring assembly. The hydraulic pump 2 and the main valve assembly 4 are connected to the connecting pipeline with the relief valve 3. The relief valve 3 is an oil pressure protection device. In the figure, its A port is connected to the output end of the hydraulic pump 2, and the B port is connected to the oil tank 1. When the system pressure exceeds the protection pressure set by the relief valve 3, the oil pump pressure will be unloaded, and the unloaded hydraulic oil will flow back to the oil tank 1 through the B port of the relief valve 3.

[0027] The main valve assembly 4 adopts a two-position three-way reversing valve. In the figure, its A port is the oil inlet, connected to the hydraulic pump 2, the P port is the oil return port, connected to the oil tank 1, the T port is the oil outlet, connected to 4 groups of control solenoid valves in parallel, and the S port is the control signal. When the S port is in position 1, it indicates that the power is on. At this time, the hydraulic oil in the valve flows from port A to port T. When the S port is in position 0, it indicates that the power is off. At this time, the hydraulic oil in the valve flows from port A to port P.

[0028] The four control solenoid valve groups have the same composition and are connected in parallel at the T-port end of the main valve assembly 4, namely the left front control solenoid valve group 5, the right front control solenoid valve group 6, the left rear control solenoid valve group 7 and the right rear control solenoid valve group 8. Each control solenoid valve group includes an oil inlet valve 101, an oil return valve 102, a check valve 103 and a locking valve 104, wherein the oil inlet valve 101, the oil return valve 102 and the locking valve 104 are two-position two-way reversing solenoid valves. One end of the oil inlet valve 101 is arranged in series with the check valve 103, and the other end of the oil inlet valve 101 of the four control solenoid valve groups is connected in parallel to the oil outlet of the T end of the main valve assembly 4. One end of the check valve 103 and the locking valve 104 are connected in parallel to the oil supply pipeline of the corresponding oil-gas spring assembly, and the other end of the locking valve 104 is connected in series with the oil return valve 102, and the oil return valve 102 is connected to the oil tank 1. When the oil inlet valve 101 is opened and the oil return valve 102 and the locking valve 104 are closed, the hydraulic oil from the main valve assembly 4 enters the corresponding oil-gas spring assembly through the oil inlet valve 101 and the one-way valve 103, while the oil return valve 102 and the locking valve 104 are blocked. At this time, the oil-gas spring assembly rises due to oil filling; when the oil inlet valve 101 is closed and the oil return valve 102 and the locking valve 104 are controlled to be opened, the hydraulic oil of the main valve assembly 4 cannot flow in through the oil inlet valve 101, the oil inlet valve 101 and the one-way valve 103 are cut off, while the oil return valve 102 and the locking valve 104 are connected, and the hydraulic oil in the oil-gas spring assembly returns to the oil tank 1 through the oil return valve 102 and the locking valve 104. At this time, the oil-gas spring assembly releases oil and descends.

[0029] The structures of the four sets of oil-gas spring assemblies are also exactly the same, namely the left front oil-gas spring assembly 9, the right front oil-gas spring assembly 10, the left rear oil-gas spring assembly 11 and the right rear oil-gas spring assembly 12. Each set of oil-gas spring assemblies also includes two groups of sub-assemblies, the first oil-gas spring sub-assembly 201 and the second oil-gas spring sub-assembly 202, a total of 8 sub-assemblies, representing the 8 oil-gas suspensions of the vehicle. Figure 2As shown, the subassembly includes a two-way hydraulic cylinder 203 and a limiting mechanism 204. The two-way hydraulic cylinder 203 is used to simulate the oil-gas suspension of the vehicle, and the limiting mechanism 204 is used to simulate the load of the oil-gas suspension of the vehicle. The cylinder body of the two-way hydraulic cylinder 203 is provided with piston chambers A and B on both sides of the piston, respectively. The cylinder body ends of the two-way hydraulic cylinder 203 are fixed, and the end of the piston rod is connected to the limiting mechanism 204. The limiting mechanism is composed of mechanical limiting parts, dampers, spring stiffness components and other components, which is the existing technology, and the limiting mechanism is also fixedly installed.

[0030] A displacement sensor 205 is provided at the piston rod of each bidirectional hydraulic cylinder 203 for detecting the telescopic distance of the piston rod, i.e., the lifting height of the suspension. The two piston chambers A and B of the bidirectional hydraulic cylinder 203 are respectively connected with a first pressure sensor 206 and a second pressure sensor 207 for detecting the pressure changes of the two piston chambers. The piston chamber pipeline of the bidirectional hydraulic cylinder 203 is connected to the corresponding control solenoid valve group, wherein the left front control solenoid valve group 5 is connected to the A chambers of the two bidirectional hydraulic cylinders 203 of the left front oil and gas spring assembly 9, and cross-connected to the B chambers of the two bidirectional hydraulic cylinders 203 of the right front oil and gas spring assembly 10, and the right front control solenoid valve group 6 is connected to the A chambers of the two bidirectional hydraulic cylinders 203 of the right front oil and gas spring assembly 10, and cross-connected to the B chambers of the two bidirectional hydraulic cylinders 203 of the left front oil and gas spring assembly 9. Similarly, the left rear control solenoid valve group 7 and the right rear control solenoid valve group 8 are also cross-connected with the left rear oil-gas spring assembly 11 and the right rear oil-gas spring assembly 12 .

[0031] Each set of oil-gas spring assembly is also correspondingly configured with an accumulator assembly, namely the left front accumulator assembly 13, the right front accumulator assembly 14, the left rear accumulator assembly 15 and the right rear accumulator assembly 16. Each set of accumulator assembly is composed of two sets of parallel solenoid valves and accumulators, wherein the first solenoid valve 301 and the first accumulator 303 are connected in series, the second solenoid valve 302 and the second accumulator 304 are connected in series, and the first solenoid valve 301 and the second solenoid valve 302 are connected in parallel to the piston chambers of the two bidirectional actuating hydraulic cylinders 203 of the corresponding oil-gas spring assembly. The first solenoid valve 301 and the second solenoid valve 302 also adopt two-position two-way reversing valves. When the first solenoid valve 301 and the second solenoid valve 302 are energized (i.e., position 1), the inert gas in the first accumulator 303 and the second accumulator 304 is separated from the oil of the corresponding oil-gas spring assembly through the corresponding first solenoid valve 301 and the second solenoid valve 302. At this time, the suspension system represented by the oil-gas spring assembly is rigidly locked; when the first solenoid valve 301 and the second solenoid valve 302 are de-energized at the same time (i.e., position 0), the inert gas in the first accumulator 303 and the second accumulator 304 is connected to the oil of the corresponding oil-gas spring assembly through the corresponding first solenoid valve 301 and the second solenoid valve 302. At this time, the suspension system represented by the oil-gas spring assembly is a flexible support.

[0032] In addition, it should be noted that the S terminals of all control solenoid valves in the figure are control signal terminals, which need to be connected to the control strategy output terminal of the test model through the signal conversion component. The entire test model needs to set its solver f(x) = 0, the solver is set to discrete mode, the sampling time is set to t, and the solver input terminal needs to be connected to the entire test model to ensure that the model test runs through.

[0033] The above contents are only preferred embodiments of the present invention and cannot be used to limit the scope of implementation of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. An adjustable oil-gas suspension test model based on Simscape, characterized in that: The adjustable oil-gas suspension test model includes a hydraulic power assembly, a main valve assembly, four sets of control solenoid valve groups, four sets of oil-gas spring assemblies and an accumulator assembly. The output end of the hydraulic power assembly is connected to the main valve assembly, the four sets of control solenoid valve groups are connected in parallel to the output end of the main valve assembly, and the four sets of oil-gas spring assemblies are correspondingly connected to the four sets of control solenoid valve groups and the accumulator assembly.

2. The adjustable oil-gas suspension test model based on Simscape according to claim 1, characterized in that: The hydraulic power assembly includes an oil tank and a hydraulic pump. The input end of the hydraulic pump is connected to the oil tank, and the output end is connected to the main valve assembly. An overflow valve is connected to the connecting pipeline between the hydraulic pump and the main valve assembly, and the output end of the overflow valve is connected to the oil tank.

3. The adjustable oil-gas suspension test model based on Simscape according to claim 2, characterized in that: The main valve assembly is a two-position three-way valve, provided with an oil inlet, an oil outlet and an oil return port, the oil inlet is connected to a hydraulic pump, the oil outlet is connected to four sets of control solenoid valve groups in parallel, and the oil return port is connected to an oil tank.

4. The adjustable oil-gas suspension test model based on Simscape according to claim 3 is characterized in that: The four sets of control solenoid valve groups have the same composition, which are respectively a left front control solenoid valve group, a right front control solenoid valve group, a left rear control solenoid valve group and a right rear control solenoid valve group. The control solenoid valve group includes an oil inlet valve, an oil return valve, a one-way valve and a locking valve. One end of the oil inlet valve is connected in series with the one-way valve, and the other end of the oil inlet valve of the four sets of control solenoid valve groups is connected in parallel to the oil outlet of the main valve assembly. One end of the one-way valve and the locking valve are connected in parallel to the oil supply pipeline of the corresponding oil-gas spring assembly. The other end of the locking valve is connected in series with the oil return valve, and the oil return valve is connected to the oil tank.

5. The adjustable oil-gas suspension test model based on Simscape according to claim 4, characterized in that: The four sets of oil-gas spring assemblies have the same structure, which are a left front oil-gas spring assembly, a right front oil-gas spring assembly, a left rear oil-gas spring assembly and a right rear oil-gas spring assembly. Each set of oil-gas spring assemblies includes two groups of sub-assemblies, and the sub-assemblies include a bidirectional hydraulic cylinder and a limiting mechanism. The cylinder body of the bidirectional hydraulic cylinder is respectively provided with piston chambers on both sides of the piston. The cylinder body end of the bidirectional hydraulic cylinder is fixed, and the end of the piston rod is connected to the limiting mechanism.

6. The adjustable oil-gas suspension test model based on Simscape according to claim 5, characterized in that: The four sets of oil-gas spring assemblies are respectively connected to accumulator assemblies, and the accumulator assemblies are provided with two sets of parallel electromagnetic valves and accumulators, and the electromagnetic valves and accumulators are connected in series.

7. The adjustable oil-gas suspension test model based on Simscape according to claim 6, characterized in that: The two piston chambers of each bidirectional hydraulic cylinder are respectively connected to a pressure sensor.

8. The Simscape-based adjustable oil-gas suspension test model according to claim 7, characterized in that: A displacement sensor is arranged at the piston rod of each bidirectional hydraulic cylinder.

9. The adjustable oil-gas suspension test model based on Simscape according to claim 7, characterized in that: The left front control solenoid valve group is connected to the left front oil-gas spring assembly and cross-connected to the right front oil-gas spring assembly. The right front control solenoid valve group is connected to the right front oil-gas spring assembly and cross-connected to the left front oil-gas spring assembly. The left rear control solenoid valve group is connected to the left rear oil-gas spring assembly and cross-connected to the right rear oil-gas spring assembly. The right rear control solenoid valve group is connected to the right rear oil-gas spring assembly and cross-connected to the left rear oil-gas spring assembly.

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