Redundant drive-by-wire hydraulic brake system of pure electric loader

Abstract

The utility model discloses a redundant drive-by-wire hydraulic brake system of a pure electric loader, and belongs to the technical field of engineering machinery. Comprising a hydraulic relay valve connected with a front brake and a rear brake at the same time, the hydraulic relay valve is communicated with a shuttle valve, the shuttle valve is communicated with a normally-closed pressure valve, the normally-closed pressure valve is communicated with a single-loop brake valve, and the single-loop brake valve is communicated with an energy accumulator. According to the system, when the electric end of a whole vehicle is out of control, a hydraulic pump conveys hydraulic oil to flow to a normally-closed pressure valve through a single-loop brake valve, and when the pressure of the hydraulic oil in a pipeline is larger than the set pressure of the normally-closed pressure valve, through screening of a shuttle valve, a hydraulic relay valve is driven to brake a front brake and a rear brake; when the pressure of the hydraulic oil in the pipeline is not greater than the set pressure of the normally closed pressure valve, the system does not work; redundant braking can be achieved, and the safety of the whole vehicle is greatly guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction machinery, and specifically relates to a wire-controlled hydraulic braking system with redundancy for a pure electric loader. Background Art

[0002] The service braking system is a very important core system of construction machinery and is the key to ensuring the safe driving of the whole vehicle.

[0003] At present, the braking systems of loaders mostly adopt traditional single-loop pneumatic braking, which has deficiencies such as long braking response time and long braking distance. And in the case of a single wire-controlled braking, when the electronic control unit fails, the braking of the whole vehicle fails, which is dangerous. On the one hand, the existing wire-controlled braking mostly uses an electronic control pedal, and the pedal feel is worse than that of the traditional one. On the other hand, the existing energy recovery of loaders mostly adopts a parallel scheme, and the adjustable degree is low, resulting in a poor driving experience. Content of the Utility Model

[0004] 1. Technical Problems to be Solved by the Utility Model

[0005] The purpose of the utility model is to solve the safety problem when the electronic control unit fails in the existing wire-controlled braking and the problem of poor energy recovery experience.

[0006] 2. Technical Solutions

[0007] To achieve the above object, the technical solution provided by the utility model is as follows:

[0008] A wire-controlled hydraulic braking system with redundancy for a pure electric loader of the utility model includes a hydraulic relay valve connected to both the front brake and the rear brake at the same time. The hydraulic relay valve is connected to a shuttle valve, the shuttle valve is connected to a normally closed pressure valve, the normally closed pressure valve is connected to a single-loop brake valve, and the single-loop brake valve is connected to an accumulator.

[0009] Preferably, it further includes a hydraulic pump, a filter and a single-loop filling valve connected in sequence through pipelines. The outlet of the single-loop filling valve is divided into two branches and is respectively connected to the single-loop brake valve and the electro-hydraulic proportional brake valve.

[0010] Preferably, it further includes a VCU, which is electrically connected to the single-loop brake valve, a brake valve pressure sensor, a drive motor, an electro-hydraulic proportional brake valve pressure sensor and the electro-hydraulic proportional brake valve respectively. The brake valve pressure sensor is electrically connected to the single-loop brake valve and measures the pressure data of the single-loop brake valve. The electro-hydraulic proportional brake valve pressure sensor is electrically connected to the electro-hydraulic proportional brake valve and measures the pressure data of the electro-hydraulic proportional brake valve.

[0011] Preferably, an overflow valve is provided inside the single-loop filling valve.

[0012] Preferably, the filling gas in the accumulator is high-pressure inert gas, and the storage liquid is hydraulic oil.

[0013] Preferably, a bypass valve is provided inside the filter to prevent the filter from being blocked.

[0014] Preferably, a throttle orifice is provided inside the control port of the relay valve.

[0015] Preferably, the single-circuit brake valve is integrally provided with an angular displacement sensor, and the angular displacement sensor is electrically connected to the VCU and sends the pedal displacement value to the VCU.

[0016] Preferably, the drive motor is a motor with the ability of back-dragging braking.

[0017] 3. Beneficial effects

[0018] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0019] A wire-controlled hydraulic braking system with redundancy for a pure electric loader of the present utility model includes a hydraulic relay valve connected to both the front brake and the rear brake at the same time. The hydraulic relay valve is communicated with a shuttle valve, the shuttle valve is communicated with a normally closed pressure valve, the normally closed pressure valve is communicated with a single-circuit brake valve, and the single-circuit brake valve is communicated with an accumulator. When the electric end of the whole vehicle is out of control in the system of this application, the hydraulic pump transports hydraulic oil to flow to the normally closed pressure valve through the single-circuit brake valve. When the hydraulic oil pressure in the pipeline is greater than the set pressure of the normally closed pressure valve, after being screened by the shuttle valve, it drives the hydraulic relay valve to brake the front brake and the rear brake; when the hydraulic oil pressure in the pipeline is not greater than the set pressure of the normally closed pressure valve, the system does not work; redundant braking can be achieved, which greatly guarantees the safety of the whole vehicle. Description of the drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of a wire-controlled hydraulic braking system with redundancy for a pure electric loader of the present utility model.

[0021] 1. Hydraulic pump; 2. Filter; 3. Single-circuit filling valve; 4. Single-circuit brake valve; 5. Brake valve pressure sensor; 6. Hydraulic relay valve; 7. Shuttle valve; 8. Front brake; 9. Rear brake; 10. Drive motor; 11. Electro-hydraulic proportional brake valve pressure sensor; 12. Electro-hydraulic proportional brake valve; 13. Accumulator; 14. VCU; 15. Normally closed pressure valve. Detailed implementation manners

[0022] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0023] It should be noted that the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so as to describe the embodiments of this application here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0024] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0025] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above-mentioned terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0026] In addition, the terms "install", "set", "be provided with", "connect", "be connected", "be sleeved" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

[0027] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0028] Embodiment 1

[0029] Referring to the attached Figure 1 For a wire-controlled hydraulic braking system with redundancy for a pure electric loader in this embodiment, it includes a hydraulic relay valve 6 connected to both the front brake 8 and the rear brake 9 simultaneously. The hydraulic relay valve 6 is connected to a shuttle valve 7, the shuttle valve 7 is connected to a normally closed pressure valve 15, the normally closed pressure valve 15 is connected to a single-circuit brake valve 4, and the single-circuit brake valve 4 is connected to an accumulator 13. When the electric end of the whole vehicle is out of control in the system of this embodiment, the hydraulic pump 1 delivers hydraulic oil to flow through the single-circuit brake valve 4 to the normally closed pressure valve 15. When the hydraulic oil pressure in the pipeline is greater than the set pressure of the normally closed pressure valve 15, after being screened by the shuttle valve 7, it drives the hydraulic relay valve 6 to brake the front brake 8 and the rear brake 9; when the hydraulic oil pressure in the pipeline is not greater than the set pressure of the normally closed pressure valve 15, the system does not work; redundant braking can be achieved, which greatly ensures the safety of the whole vehicle.

[0030] It further includes a hydraulic pump 1, a filter 2, and a single-circuit filling valve 3 connected in sequence through pipelines. The outlet of the single-circuit filling valve 3 is divided into two branches and is respectively connected to the single-circuit brake valve 4 and the electro-hydraulic proportional brake valve 12.

[0031] It further includes a VCU 14, which is electrically connected to the single-circuit brake valve 4, the brake valve pressure sensor 5, the drive motor 10, the electro-hydraulic proportional brake valve pressure sensor 11, and the electro-hydraulic proportional brake valve 12 respectively. The brake valve pressure sensor 5 is electrically connected to the single-circuit brake valve 4 and measures the pressure data of the single-circuit brake valve 4. The electro-hydraulic proportional brake valve pressure sensor 11 is electrically connected to the electro-hydraulic proportional brake valve 12 and measures the pressure data of the electro-hydraulic proportional brake valve 12.

[0032] The single-circuit filling valve 3 is internally provided with an overflow valve to ensure that the pressure of the whole vehicle system will not exceed the set value and ensure safety. On the other hand, an integrated pressure sensor can be used as the source of the system pressure for instrument display.

[0033] The filling gas in the accumulator 13 is high-pressure inert gas, and the stored liquid is hydraulic oil.

[0034] The filter 2 is internally provided with a bypass valve to prevent the filter from being blocked.

[0035] The control port of the relay valve 6 is internally provided with a throttle orifice to reduce the system flow rate and pressure loss. And the pressure of the control port is the same as the pressure of the output port.

[0036] The single-loop brake valve 4 is integrally provided with an angular displacement sensor. The angular displacement sensor is electrically connected to the VCU 14 and sends the pedal displacement value to the VCU 14 to provide input for the by-wire braking. Moreover, a brake valve pressure sensor 5 is connected, which can transmit the pressure signal to the VCU 14. The drive motor 10 is a motor with the ability of reverse drag braking and acts as a generator during reverse drag braking.

[0037] The above embodiments only represent certain implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A redundant wire-controlled hydraulic brake system for a pure electric loader, characterized in that: The invention comprises a hydraulic relay valve (6) connected to both the front brake (8) and the rear brake (9), wherein the hydraulic relay valve (6) is connected to a shuttle valve (7), wherein the shuttle valve (7) is connected to a normally closed pressure valve (15), wherein the normally closed pressure valve (15) is connected to a single-circuit brake valve (4), and wherein the single-circuit brake valve (4) is connected to an accumulator (13).

2. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 1 is characterized in that: It also includes a hydraulic pump (1), a filter (2) and a single-circuit filling valve (3) which are connected in sequence through pipelines, wherein the outlet of the single-circuit filling valve (3) is divided into two branches which are respectively connected to the single-circuit brake valve (4) and the electric proportional brake valve (12).

3. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 2 is characterized in that: The invention also comprises a VCU (14), wherein the VCU (14) is electrically connected to a single-circuit brake valve (4), a brake valve pressure sensor (5), a drive motor (10), an electric proportional brake valve pressure sensor (11) and an electric proportional brake valve (12), respectively; the brake valve pressure sensor (5) is electrically connected to the single-circuit brake valve (4) and measures pressure data of the single-circuit brake valve (4); and the electric proportional brake valve pressure sensor (11) is electrically connected to the electric proportional brake valve (12) and measures pressure data of the electric proportional brake valve (12).

4. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 3 is characterized in that: The single-circuit filling valve (3) is provided with an overflow valve inside.

5. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 3 is characterized in that: The filling gas in the accumulator (13) is a high-pressure inert gas, and the stored liquid is hydraulic oil.

6. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 3 is characterized in that: The filter (2) is internally provided with a bypass valve to prevent the filter from being blocked.

7. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 3 is characterized in that: A throttle port is built into the control port of the relay valve (6).

8. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 3 is characterized in that: The single-circuit brake valve (4) is integrated with an angular displacement sensor, which is electrically connected to the VCU (14) and sends a pedal displacement value to the VCU (14).

9. The redundant wire-controlled hydraulic brake system for a pure electric loader according to claim 3 is characterized in that: The driving motor (10) is a motor with reverse braking capability.

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