Electric steering system testing device

Abstract

The invention relates to the technical field of vehicle steering, in particular to an electric steering system testing device. The invention provides an electric steering system testing device, which comprises a load hydraulic valve group, an oil tank, a support and a load oil cylinder, wherein the support is used for mounting an electric steering gear; the load oil cylinder is respectively connected with the electric steering gear and the load hydraulic valve group; the electric steering gear serves as a tested object, and when the electric steering gear rotates, a piston rod of the load oil cylinder is driven to advance or retreat. And the load hydraulic valve group is connected with the oil tank, is mounted on the support and is used for forward and reverse control of load pressure. Forward and reverse continuous, accurate and remote control of load pressure is realized by combining the one-way valve and the proportional overflow valve, the comprehensive dynamic performance test of the electric steering system is performed, the structure is simple, the cost is low, and the reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle steering, and more particularly to an electric steering system testing device. Background Art

[0002] At present, electric steering systems have been gradually applied in the automotive field. Comprehensive dynamic performance test equipment simulates the load conditions of the electric steering system during actual operation. It is of great significance to the torque characteristics, noise test and dynamic response test of the steering system, and is also a necessary equipment for evaluating the performance of electric steering.

[0003] The common form of the electric power steering system test device in the prior art is a magnetic powder brake mechanism and a load motor drag form. However, the above test device has the following problems:

[0004] Magnetic powder brakes cannot achieve fast simulation of forward and reverse rotation of electric steering systems and are usually used to test motor stability;

[0005] The load motor dragging installation structure is complex, the cost is high, and it is easy to cause the motor to run away. There is a situation where the motor being tested is dragged in the reverse direction, and the reliability is poor.

[0006] Therefore, there is an urgent need for an electric power steering system testing device. Summary of the invention

[0007] The purpose of the present invention is to provide an electric steering system test device to solve the problem that the electric steering system test device in the prior art cannot realize the fast simulation of the forward and reverse rotation of the electric steering system.

[0008] Another object of the present invention is to provide an electric steering system test device to solve the problems of the electric steering system test device in the prior art, which has a complex structure, high cost and poor reliability.

[0009] In order to achieve the above object, the present invention provides an electric steering system test device, including a load hydraulic valve group, an oil tank, a support and a load oil cylinder:

[0010] The support is used to install the electric steering gear;

[0011] The load oil cylinder is connected to the electric steering gear and the load hydraulic valve group respectively;

[0012] The load hydraulic valve group is connected to the oil tank and installed on the support to control the forward and reverse direction of the load pressure;

[0013] The electric steering gear is used as the object to be measured. When the electric steering gear rotates, it drives the piston rod of the load cylinder to move forward or backward.

[0014] In one embodiment, the load oil cylinder and the load hydraulic valve group are connected via a hose.

[0015] In one embodiment, the load hydraulic valve group and the oil tank are connected via a hard pipe.

[0016] In one embodiment, the load hydraulic valve group includes a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve and a proportional relief valve:

[0017] The first one-way valve has a first end connected to the fourth one-way valve and a second end connected to the second one-way valve;

[0018] The fourth one-way valve has a first end connected to the first one-way valve and a second end connected to the third one-way valve;

[0019] The second one-way valve has a first end connected to the first one-way valve and a second end connected to the third one-way valve;

[0020] The third one-way valve has a first end connected to the fourth one-way valve and a second end connected to the second one-way valve;

[0021] The proportional relief valve has a first end connected to the first one-way valve and the second one-way valve, and a second end connected to the third one-way valve and the fourth one-way valve;

[0022] The first one-way valve and the fourth one-way valve are connected to the rodless chamber of the oil cylinder;

[0023] The second one-way valve and the third one-way valve are connected to the rod chamber of the oil cylinder.

[0024] In one embodiment, the second end of the proportional relief valve is connected to the oil tank.

[0025] In one embodiment, the proportional relief valve is used to adjust the system pressure;

[0026] The first one-way valve, the second one-way valve, the third one-way valve and the fourth one-way valve are used to control the direction of the oil circuit.

[0027] In one embodiment, the load hydraulic valve group further includes a first pressure gauge and a second pressure gauge:

[0028] The first pressure gauge is connected to the first one-way valve and the fourth one-way valve and is used to display the pressure of the rodless chamber of the oil cylinder;

[0029] The second pressure gauge is connected to the second one-way valve and the third one-way valve, and is used to display the pressure of the rod chamber of the oil cylinder.

[0030] In one embodiment, when the electric steering gear rotates in the first direction, oil is sucked from the oil tank and enters the rodless chamber of the load oil cylinder through the fourth one-way valve;

[0031] Push the load cylinder piston rod forward, and the oil in the rod chamber passes through the second one-way valve into the proportional relief valve and flows back to the oil tank.

[0032] In one embodiment, when the electric steering gear rotates in the second direction, oil is sucked from the oil tank and enters the rod chamber of the load oil cylinder through the third one-way valve;

[0033] Push the load cylinder piston rod backward, and the oil in the rodless chamber passes through the first one-way valve into the proportional relief valve and flows back to the oil tank.

[0034] In one embodiment, the proportional relief valve generates a certain back pressure through remote pressure regulation to simulate the electric steering load.

[0035] The present invention proposes an electric steering system test device, which realizes continuous, precise and remote control of the load pressure in both forward and reverse directions by combining a one-way valve and a proportional relief valve, and performs a comprehensive dynamic performance test of the electric steering system. The device has a simple structure, low cost and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0037] Figure 1 A structural diagram of an electric power steering system testing device according to an embodiment of the present invention is disclosed;

[0038] Figure 2 A top view of an electric power steering system testing device according to an embodiment of the present invention is disclosed;

[0039] Figure 3 A schematic diagram of the principle of a load hydraulic valve group according to an embodiment of the present invention is disclosed;

[0040] Figure 4 A schematic diagram of the forward movement principle of a load cylinder according to an embodiment of the present invention is disclosed;

[0041] Figure 5 A schematic diagram of the backward movement principle of a load cylinder according to an embodiment of the present invention is disclosed.

[0042] The meanings of the reference numerals in the figures are as follows:

[0043] 1 Load hydraulic valve group;

[0044] 111 a first one-way valve;

[0045] 112 second one-way valve;

[0046] 113 third one-way valve;

[0047] 114 fourth one-way valve;

[0048] 121 first pressure gauge;

[0049] 122 second pressure gauge;

[0050] 130 proportional relief valve;

[0051] 2 fuel tanks;

[0052] 3 supports;

[0053] 4 load cylinders;

[0054] 401 rodless cavity;

[0055] 402 has a rod cavity;

[0056] 5. Electric steering gear. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and are not used to limit the invention.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] Figure 1 and Figure 2 The structure diagram and top view of the electric power steering system testing device according to an embodiment of the present invention are disclosed respectively. Figure 1 and Figure 2 As shown, the electric power steering system test device proposed in the present invention comprises a load hydraulic valve group 1, an oil tank 2, a support 3 and a load oil cylinder 4:

[0060] The support 3 is used to install the electric steering gear 5, and the electric steering gear 5 is used as the object to be measured;

[0061] The load oil cylinder 4 is connected to the electric steering gear 5 and the load hydraulic valve group 1 respectively;

[0062] The load hydraulic valve group 1 is connected to the oil tank 2 and installed on the support 3.

[0063] When the electric steering gear 5 rotates, it drives the piston rod of the load cylinder 4 forward or backward. When the electric steering gear 5 rotates counterclockwise, the load cylinder 4 moves forward, and when the electric steering gear 5 rotates clockwise, the load cylinder 4 moves backward.

[0064] The load oil cylinder 4 is connected to the load hydraulic valve group 1 through a hose;

[0065] The load hydraulic valve group 1 and the oil tank 2 are connected via a hard pipe.

[0066] Figure 3 The schematic diagram of the load hydraulic valve group according to an embodiment of the present invention is disclosed. Figure 3 As shown, the load hydraulic valve group 1 includes a first one-way valve 111 , a second one-way valve 112 , a third one-way valve 113 , a fourth one-way valve 114 , a first pressure gauge 121 , a second pressure gauge 122 and a proportional relief valve 130 .

[0067] The first one-way valve 111 has a first end connected to the fourth one-way valve 114 and a second end connected to the second one-way valve 112;

[0068] The fourth one-way valve 114 has a first end connected to the first one-way valve 111 and a second end connected to the third one-way valve 113;

[0069] The second one-way valve 112 has a first end connected to the first one-way valve 111 and a second end connected to the third one-way valve 113;

[0070] The third one-way valve 113 has a first end connected to the fourth one-way valve 114 and a second end connected to the second one-way valve 112;

[0071] The proportional relief valve 130 has a first end connected to the first check valve 111 and the second check valve 112, and a second end connected to the third check valve 113 and the fourth check valve 114;

[0072] The second end of the proportional relief valve 130 is connected to the oil tank 2;

[0073] The first one-way valve 111 and the fourth one-way valve 114 are connected to the rodless chamber 401 of the oil cylinder;

[0074] The second one-way valve 112 and the third one-way valve 113 are connected to the rod chamber 402 of the oil cylinder.

[0075] like Figure 3 As shown, the first pressure gauge 121 is connected to the first one-way valve 111 and the fourth one-way valve 114, and is used to display the pressure of the rodless chamber 401 of the oil cylinder;

[0076] like Figure 3As shown, the second pressure gauge 122 is connected to the second one-way valve 112 and the third one-way valve 113, and is used to display the pressure of the rod chamber 402 of the oil cylinder;

[0077] A proportional relief valve 130, used to adjust the system pressure;

[0078] The first one-way valve 111 , the second one-way valve 112 , the third one-way valve 113 and the fourth one-way valve 114 are used to control the direction of the oil circuit.

[0079] The electric steering system test device proposed in the present invention adopts a passive loading scheme without the need for a hydraulic oil source to provide pressure, and forms back pressure by passively extending and retracting an oil cylinder following the electric steering gear.

[0080] The electric steering gear 5 rotates counterclockwise, and the piston rod of the load oil cylinder 4 moves forward. In this embodiment, the counterclockwise direction is the first direction.

[0081] Figure 4 The schematic diagram of the load cylinder advancing principle according to an embodiment of the present invention is disclosed. Figure 4 As shown, when the electric steering gear 5 rotates counterclockwise, the test device draws oil from the oil tank 2 and enters the rodless chamber 401 of the load oil cylinder through the fourth one-way valve 114;

[0082] The piston rod of the load cylinder 4 is pushed forward in the direction of the arrow, and the oil in the rod chamber 402 passes through the second one-way valve 112 and enters the proportional relief valve 130 , and finally flows back to the oil tank 2 .

[0083] The red part is the direction of the oil circuit.

[0084] The proportional relief valve 130 generates a certain back pressure through remote pressure regulation to simulate the electric steering load.

[0085] The electric steering gear 5 rotates clockwise, and the piston rod of the load oil cylinder 4 moves backward. In this embodiment, the clockwise direction is the second direction.

[0086] Figure 5 The schematic diagram of the load cylinder retreat principle according to an embodiment of the present invention is disclosed. Figure 5 As shown, when the electric steering gear 5 rotates clockwise, the test device draws oil from the oil tank 2 and enters the rod chamber 402 of the load oil cylinder through the third one-way valve 3;

[0087] The piston rod of the load cylinder 4 is pushed back in the direction of the arrow, and the oil in the rodless chamber 401 passes through the first one-way valve 111 and enters the proportional relief valve 130 , and finally flows back to the oil tank 2 .

[0088] The red part is the direction of the oil circuit.

[0089] The proportional relief valve 130 generates a certain back pressure through remote pressure regulation to simulate the electric steering load.

[0090] The present invention proposes an electric steering system test device, which realizes continuous, precise and remote control of the load pressure in both forward and reverse directions by combining a one-way valve and a proportional relief valve, and performs a comprehensive dynamic performance test of the electric steering system. The device has a simple structure, low cost and high reliability.

[0091] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0092] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0093] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0094] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the connection inside two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] The above embodiments are provided for persons familiar with the art to implement or use the present invention. Personnel familiar with the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. An electric power steering system test device, characterized in that: Including load hydraulic valve group, oil tank, support and load cylinder: The support is used to install the electric steering gear; The load oil cylinder is connected to the electric steering gear and the load hydraulic valve group respectively; The electric steering gear is used as the object to be tested, and the rotation of the electric steering gear drives the piston rod of the load cylinder to move forward or backward; The load hydraulic valve group is connected to the oil tank and installed on the support to control the forward and reverse directions of the load pressure.

2. The electric power steering system testing device according to claim 1, characterized in that: The load oil cylinder and the load hydraulic valve group are connected via a hose.

3. The electric power steering system testing device according to claim 1, characterized in that: The load hydraulic valve group and the oil tank are connected via a hard pipe.

4. The electric power steering system testing device according to claim 1, characterized in that: The load hydraulic valve group includes a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve and a proportional relief valve: The first one-way valve has a first end connected to the fourth one-way valve and a second end connected to the second one-way valve; The fourth one-way valve has a first end connected to the first one-way valve and a second end connected to the third one-way valve; The second one-way valve has a first end connected to the first one-way valve and a second end connected to the third one-way valve; The third one-way valve has a first end connected to the fourth one-way valve and a second end connected to the second one-way valve; The proportional relief valve has a first end connected to the first one-way valve and the second one-way valve, and a second end connected to the third one-way valve and the fourth one-way valve; The first one-way valve and the fourth one-way valve are connected to the rodless chamber of the oil cylinder; The second one-way valve and the third one-way valve are connected to the rod chamber of the oil cylinder.

5. The electric power steering system testing device according to claim 4, characterized in that: The second end of the proportional relief valve is connected to the oil tank.

6. The electric power steering system testing device according to claim 4, characterized in that: The proportional relief valve is used to adjust the system pressure; The first one-way valve, the second one-way valve, the third one-way valve and the fourth one-way valve are used to control the direction of the oil circuit.

7. The electric power steering system testing device according to claim 4, characterized in that: The load hydraulic valve group further includes a first pressure gauge and a second pressure gauge: The first pressure gauge is connected to the first one-way valve and the fourth one-way valve and is used to display the pressure of the rodless chamber of the oil cylinder; The second pressure gauge is connected to the second one-way valve and the third one-way valve, and is used to display the pressure of the rod chamber of the oil cylinder.

8. The electric power steering system testing device according to claim 4, characterized in that: When the electric steering gear rotates in the first direction, oil is sucked from the oil tank and enters the rodless chamber of the load oil cylinder through the fourth one-way valve; Push the load cylinder piston rod forward, and the oil in the rod chamber passes through the second one-way valve into the proportional relief valve and flows back to the oil tank.

9. The electric power steering system testing device according to claim 4, characterized in that: When the electric steering gear rotates in the second direction, oil is sucked from the oil tank and enters the rod chamber of the load oil cylinder through the third one-way valve; Push the load cylinder piston rod backward, and the oil in the rodless chamber passes through the first one-way valve into the proportional relief valve and flows back to the oil tank.

10. The electric power steering system testing device according to claim 8 or claim 9, characterized in that: The proportional relief valve generates a certain back pressure through remote pressure regulation to simulate the electric steering load.

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