Drive-by-wire hydraulic braking system of single-cavity master cylinder, control method and vehicle body arrangement structure

Abstract

The invention discloses a drive-by-wire hydraulic braking system of a single-cavity master cylinder, a control method and a vehicle body arrangement structure. The drive-by-wire hydraulic braking system comprises a first module, a second module and a hydraulic connecting pipeline connected between the first module and the second module. The drive-by-wire hydraulic braking system of the single-cavity master cylinder is divided into two integrated modules, the two integrated modules are connected through a hydraulic connecting pipeline, and the two integrated modules are arranged independently. The pressure buildup cavity of the single-cavity brake master cylinder is connected with the cavity of the pedal simulator cylinder through the hydraulic connecting pipeline, connection and disconnection of the pressure buildup cavity of the single-cavity brake master cylinder and the brake loop are controlled through the electromagnetic valve system, generalization and modularization of the integrated brake boosting module are remarkably improved, and cost is reduced in a large-scale mode. The integrated module can be developed in a customized mode, and the pedal feeling target requirement of a vehicle model is met. And meanwhile, the NVH problem caused by volume occupation interference and weight cantilever installation of the integrated brake boosting module is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile brake systems, and in particular to a single-chamber master cylinder wire-controlled hydraulic brake system, a control method and a vehicle body arrangement structure. Background Art

[0002] The style definition of brake pedal feel needs to be consistent with the style definition of the vehicle model, such as standard, sports, comfort, etc., and is closely related to the pedal lever ratio and the human-machine layout of the vehicle. For integrated brake booster units, it is generally necessary to meet the brake pedal feel target of the vehicle through customized combination matching of different master cylinder bores, piston lengths, spring stiffness and preload, different pedal simulator bores, simulator variable stiffness springs and disc springs, etc., and carry out customized development.

[0003] However, the current integrated brake booster unit pursues modularization and has high requirements for universality. It is necessary to effectively reduce the time for production line changeover and ensure that the production efficiency of the production line achieves economies of scale. Suppliers of integrated brake booster units are generally required to select from several platform solutions that they limit, which makes it difficult to fully match the pedal feel target requirements of different vehicle manufacturers. In addition, the integrated brake booster unit integrates the motor, controller, valve block, master cylinder and boost cylinder. The assembly volume occupies a large space, and the layout position is limited by the installation position of the brake pedal. For hybrid models, it is easy to have insufficient layout clearance or even interference. At the same time, the assembly weight is relatively large, and the assembly mass block is cantilevered and installed on the firewall, which is easy to resonate with the engine, and has high modal requirements for the brake pedal, firewall, and integrated brake booster unit.

[0004] Therefore, it is of great significance to develop a hydraulic brake system and method with a brake-by-wire pedal feel that meets both the brake-by-wire and backup braking requirements of the entire vehicle and the environmental layout and NVH performance requirements of the entire vehicle.

[0005] Prior art 1 discloses a pedal simulator and a brake-by-wire system and a vehicle having the same, wherein the pedal simulator comprises: a push rod; a plurality of elastic members, one end of each elastic member can be stopped and the other end is provided with a pressure-bearing portion, the plurality of elastic members are sequentially distributed along the axial direction of the push rod, the elastic member closest to the push rod is constantly stopped with the push rod through the pressure-bearing portion, and the plurality of pressure-bearing portions are spaced apart from each other in the axial direction when the push rod is in the raised position; an electromagnetic assisting member, wherein the electromagnetic assisting member is configured to at least assist the elastic member that stops the push rod in pushing the push rod or act on the elastic member that stops the push rod in a direction away from the push rod when powered on. According to the pedal simulator, the electromagnetic assisting member compensates or blocks the force applied to the push rod, thereby adjusting the pedal feel provided to the driver, thereby improving the pedal braking feel fed back to the driver, improving the comfort of human-machine interaction, and improving the driving experience of the driver.

[0006] Prior art 1 discloses a pedal simulator that cannot perform mechanical backup braking through a master cylinder and requires a high degree of redundancy for wire-controlled braking. In addition, the electromagnetic assist component in the pedal simulator compensates or blocks the force applied to the push rod, which requires current control. The system's software and hardware are highly complex, increasing the cost of the system.

[0007] Prior art 2 discloses a pedal simulator structure with a bleed screw. A master cylinder and a pedal simulator are installed in the valve body, and the pedal simulator includes a cylinder hole in the valve body; a push rod extends into the inner cavity of the master cylinder and is connected to the master cylinder piston, and the inner cavity of the master cylinder contains a master cylinder piston and a master cylinder spring; in the cylinder hole, the pedal simulator piston divides the cylinder hole into a first chamber close to and a second chamber away from the push rod, and the pedal simulator piston is coaxially elastically connected to the limit seat through the simulator's first return spring, the limit seat is connected to the pedal simulator push rod, the pedal simulator push rod is connected to the pedal simulator end cover, and the pedal simulator end cover is installed in the opening of the cylinder hole that passes through the valve body. This technical solution can meet the role of quickly removing air from the pedal simulator during the exhaust process of the vehicle brake system, and can accelerate the exhaust of the entire brake system by accelerating the exhaust speed of the pedal simulator, and the exhaust is more sufficient.

[0008] Prior art 2 discloses a pedal simulator structure with a bleed screw, which is integrated with a master cylinder and can be adapted to a brake-by-wire system, but does not disclose a brake-by-wire system and solution that meets the mechanical backup braking requirements of the brake-by-wire system. Summary of the invention

[0009] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and to provide a hydraulic brake system, control method and body layout structure of a single-chamber master cylinder with a wire-controlled brake pedal feel that meets the requirements of the whole vehicle's wire-controlled braking and backup braking, and meets the environmental layout and NVH performance requirements of the whole vehicle.

[0010] To achieve this purpose, the single-chamber master cylinder wire-controlled hydraulic brake system designed in the present invention includes a first module, a second module and a hydraulic connection pipeline connected between the first module and the second module; the first module includes a single-chamber brake master cylinder with a piston input rod fixedly connected to the brake pedal and having a single pressure-building chamber, a pedal simulator cylinder integrated with the single-chamber brake master cylinder and a master cylinder reservoir for storing and replenishing brake fluid to the single-chamber brake master cylinder; the second module includes a plurality of wheel-side brake pipelines respectively connected to a plurality of wheel-side brake calipers; and a plurality of wheel-side brake calipers respectively connected to the plurality of wheel-side brake calipers. The wheel-side brake pipeline is connected to a booster mechanism that can introduce brake fluid through multiple wheel-side brake pipelines to multiple wheel-side brake calipers for wire-controlled hydraulic braking; and a booster mechanism refilling tank for storing and replenishing brake fluid to the booster mechanism; the hydraulic connection pipeline includes a hydraulic pipeline connected to multiple wheel-side brake pipelines that can introduce brake fluid of the brake master cylinder through multiple wheel-side brake pipelines to multiple wheel-side brake calipers for mechanical backup braking; a pipeline is connected between the master cylinder reservoir and the booster mechanism refilling tank. The booster mechanism includes a booster cylinder and a motor transmission mechanism for driving the piston in the booster cylinder to move.

[0011] Furthermore, the first module also includes a pedal simulator cylinder integrated with the single-chamber brake master cylinder, and the pedal simulator cylinder is connected to the single-chamber brake master cylinder through the hydraulic connecting pipeline. The hydraulic connecting pipeline can introduce the brake fluid of the single-chamber brake master cylinder into the pedal simulator cylinder and provide braking force feedback to the brake pedal.

[0012] Furthermore, the hydraulic connecting pipeline includes a first brake hydraulic pipeline for connecting the pressure-building chamber of the single-chamber brake master cylinder and the plurality of wheel-side brake pipelines, and a second brake hydraulic pipeline for connecting the pedal simulator cylinder with the first brake hydraulic pipeline.

[0013] Furthermore, each of the wheel-side brake pipelines is connected to an ABS return fluid channel, and the ABS return fluid channel is connected to the booster mechanism fluid replenishment tank.

[0014] A control method for a wire-controlled hydraulic brake system based on the single-chamber master cylinder described above includes a pedal feel simulation control method for the single-chamber brake master cylinder, which includes: cutting off the connection between the hydraulic connecting line and the multiple wheel-side brake lines, stepping on the brake pedal, driving the piston in the single-chamber brake master cylinder to move, introducing the brake fluid in the single-chamber brake master cylinder into the pedal simulator cylinder through the hydraulic connecting line to generate pedal force feedback, and designing and matching the single-chamber brake master cylinder and the pedal simulator cylinder according to the pedal force feedback so that the pedal feel achieves the design goal.

[0015] Furthermore, the pedal feel simulation control method of the single-chamber brake master cylinder also includes: obtaining the stroke of the brake pedal, and proportionally introducing the brake fluid in the booster mechanism into the wheel-side brake caliper according to the stroke of the brake pedal.

[0016] Furthermore, the control method of the wire-controlled hydraulic brake system of the single-chamber master cylinder also includes a control method of wire-controlled hydraulic braking, and the control method of wire-controlled hydraulic braking includes: cutting off the connection between the hydraulic connecting pipeline and the multiple wheel-side brake pipelines, stepping on the brake pedal, driving the piston in the boosting mechanism to move, and the boosting mechanism introduces the brake fluid into the multiple wheel-side brake calipers through the multiple wheel-side brake pipelines.

[0017] Furthermore, the control method of the wire-controlled hydraulic brake system of the single-chamber master cylinder also includes a control method for mechanical backup braking, which includes: cutting off the hydraulic connecting line between the single-chamber brake master cylinder and the pedal simulator cylinder, stepping on the brake pedal, driving the piston in the single-chamber brake master cylinder to move, and introducing the brake fluid in the single-chamber brake master cylinder through the hydraulic connecting line and the multiple wheel-side brake lines into the multiple wheel-side brake calipers.

[0018] The body layout structure of the single-chamber master cylinder's wire-controlled hydraulic brake system includes a body, and the single-chamber master cylinder's wire-controlled hydraulic brake system described above, the first module and the second module are respectively installed on different structural parts of the body, and the hydraulic connecting pipeline is connected between the first module and the second module.

[0019] Furthermore, the first module is installed on the vehicle body firewall, and the second module is installed on a structural member with high vehicle body rigidity.

[0020] The beneficial effects of the present invention are as follows: the present invention divides the wire-controlled hydraulic brake system of the single-chamber master cylinder into two integrated modules, and connects the two integrated modules through a hydraulic connecting pipeline, and the two integrated modules are independently arranged. The pressure-building chamber of the single-chamber brake master cylinder is connected to the cavity of the pedal simulator cylinder through a hydraulic connecting pipeline, and the on-off of the pressure-building chamber of the single-chamber brake master cylinder and the brake circuit are controlled by the solenoid valve system, which significantly improves the universality and modularity of the integrated brake booster module and reduces the cost on a large scale. The integrated module can be customized to meet the pedal feel target requirements of the vehicle model. At the same time, it solves the NVH problems caused by the volume occupation interference and weight cantilever installation of the integrated brake booster module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the principle of the wire-controlled hydraulic brake system of the single-chamber master cylinder in the present invention;

[0022] Figure 2A three-dimensional diagram of the vehicle body arrangement structure of the wire-controlled hydraulic brake system of the single-chamber master cylinder in the present invention;

[0023] Among them, 1 is the first module, 2 is the second module, 3 is the single-chamber brake master cylinder, 4 is the pedal simulator cylinder, 5 is the booster cylinder, 6 is the master cylinder reservoir, 7 is the booster mechanism replenisher tank, 8 is the first brake hydraulic pipeline, 9 is the second brake hydraulic pipeline, 10 is the pedal simulator solenoid valve, 11 is the brake pedal, 12 is the hydraulic pressure sensor, 13 is the first master cylinder isolation solenoid valve, 14 is the second master cylinder isolation solenoid valve, 15 is the motor transmission mechanism, 16 is the first booster cylinder isolation solenoid valve, 17 is the second booster cylinder isolation solenoid valve, 18 is the booster valve, 19 is the pressure reducing valve, 20 is the one-way valve, 21 is the wheel side brake pipeline, 22 is the hydraulic connecting pipeline, 23 is the ABS return fluid channel, 24 is the vehicle body. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Glossary:

[0026] The first module 1: consists of a single-chamber brake master cylinder 3, a master cylinder fluid reservoir 6 and a pedal simulator cylinder 4. The single-chamber brake master cylinder 3 is a single-chamber structure. The master cylinder fluid reservoir 6 replenishes brake fluid to the single-chamber brake master cylinder 3 and the booster mechanism replenishing tank 7. The single-chamber brake master cylinder 3 is connected to the pedal simulator cylinder 4 through a hydraulic connecting line 22. When the driver steps on the brake pedal 11, the single-chamber brake master cylinder 3 can introduce the brake fluid into the pedal simulator cylinder 4 through the hydraulic connecting line 22, and the pedal simulator cylinder 4 provides braking feedback.

[0027] The second module 2: includes a boosting mechanism, which is composed of a boosting cylinder 5 and a motor transmission mechanism 15. The motor transmission mechanism 15 can drive the piston of the boosting cylinder 5 to move, and transport the brake fluid to the wheel-side brake pipeline 21 and the wheel-side brake caliper to realize wire control braking operation, or the single-chamber brake master cylinder 3 transports the brake fluid to the wheel-side brake pipeline 21 and the wheel-side brake caliper to realize mechanical backup braking, and the boosting cylinder 5 is supplemented with brake fluid through the boosting mechanism reservoir 7.

[0028] Hydraulic connecting pipeline 22: includes the first brake hydraulic pipeline 8 and the second brake hydraulic pipeline 9. The first brake hydraulic pipeline 8 is connected to the pressure building chamber of the single-chamber brake master cylinder 3, and the brake fluid is transported to the wheel-side brake pipeline 21 and the wheel-side brake caliper through the first master cylinder isolation solenoid valve 13 and the second master cylinder isolation solenoid valve 14 to realize mechanical backup braking; the second brake hydraulic pipeline 9 is connected to the pressure building chamber of the single-chamber brake master cylinder 3 and the pedal simulator cylinder 4, and the brake feedback is realized through the pedal simulator solenoid valve 10 in the pedal simulator cylinder 4.

[0029] Wheel-side brake pipeline 21: includes a booster valve 18, which is used to transport brake fluid to the wheel-side brake caliper to achieve the braking operation of the vehicle.

[0030] ABS return fluid channel 23: includes a pressure reducing valve 19. After ABS is started, the pressure reducing valve 19 opens to guide the brake fluid into the booster mechanism reservoir 7.

[0031] Embodiment 1:

[0032] The wire-controlled hydraulic brake system of a single-chamber master cylinder includes a first module 1, a second module 2 and a hydraulic connecting pipeline 22 connected between the first module 1 and the second module 2; the first module 1 includes a single-chamber brake master cylinder 3 with a single pressure-building chamber and a master cylinder reservoir 6 for storing and replenishing brake fluid to the single-chamber brake master cylinder 3; the second module 2 includes a plurality of wheel-side brake pipelines 21 respectively connected to a plurality of wheel-side brake calipers; a booster mechanism connected to the plurality of wheel-side brake pipelines 21 and capable of introducing brake fluid into the plurality of wheel-side brake calipers through the plurality of wheel-side brake pipelines 21 for wire-controlled hydraulic braking; and a booster mechanism replenishing tank 7 for storing and replenishing brake fluid into the booster mechanism; the hydraulic connecting pipeline 22 includes a hydraulic pipeline connected to the plurality of wheel-side brake pipelines 21 and capable of introducing brake fluid of the brake master cylinder into the plurality of wheel-side brake calipers through the plurality of wheel-side brake pipelines 21 for mechanical backup braking; a pipeline is connected between the master cylinder reservoir 6 and the booster mechanism replenishing tank 7.

[0033] Embodiment 2:

[0034] Basically the same as the first embodiment, the integrated structure of the single-chamber brake master cylinder 3 and the pedal simulator cylinder 4 is further optimized on the basis of the first embodiment: including the pedal simulator cylinder 4 integrated with the single-chamber brake master cylinder 3, the pedal simulator cylinder 4 is arranged in parallel with the single-chamber brake master cylinder, and the pedal simulator cylinder 4 can be above, below, on the left or on the right of the single-chamber brake master cylinder 3. The pedal simulator cylinder 4 is connected to the single-chamber brake master cylinder 3 through a hydraulic connection pipeline 22, and the hydraulic connection pipeline 22 can introduce the brake fluid of the single-chamber brake master cylinder 3 into the pedal simulator cylinder 4 and provide braking force feedback to the brake pedal 11.

[0035] Embodiment three:

[0036] Basically the same as Example 2, the hydraulic connecting pipeline 22 is optimized on the basis of Example 2: the hydraulic connecting pipeline 22 includes a first brake hydraulic pipeline 8 for connecting the pressure-building chamber of the single-chamber brake master cylinder 3 and multiple wheel-side brake pipelines 21, and a second brake hydraulic pipeline 9 for connecting the pedal simulator cylinder 4 with the first brake hydraulic pipeline 8.

[0037] Embodiment 4:

[0038] Basically the same as the first, second and third embodiments, the connection of the ABS return liquid flow channel 23 is optimized on the basis of the first, second or third embodiments: each wheel side brake pipeline 21 is connected to an ABS return liquid flow channel 23, and the ABS return liquid flow channel 23 is connected to the booster mechanism replenishing tank 7.

[0039] The control method of the wire-controlled hydraulic brake system based on any one of the single-chamber master cylinders in the above-mentioned embodiments 1-4 includes a pedal feel simulation control method; a mechanical backup brake control method and a system wire-controlled brake control method.

[0040] The pedal feel simulation control method includes: cutting off the connection between the hydraulic connecting line 22 and the multiple wheel-side brake lines 21, stepping on the brake pedal 11, driving the piston in the single-chamber brake master cylinder 3 to move, and introducing the brake fluid in the single-chamber brake master cylinder 3 into the pedal simulator cylinder 4 through the hydraulic connecting line 22 to generate pedal force feedback, and designing and matching the single-chamber brake master cylinder 3 and the pedal simulator cylinder 4 according to the pedal force feedback so that the pedal feel reaches the design goal.

[0041] In the process of the above-mentioned pedal feel simulation control method, the stroke of the brake pedal 11 can be obtained, and according to the stroke of the brake pedal 11, the brake fluid in the booster cylinder 5 is proportionally introduced into the wheel-side brake caliper through the motor transmission mechanism 15 to realize system wire control braking.

[0042] The control method of mechanical backup braking includes: cutting off the hydraulic connecting line 22 between the single-chamber brake master cylinder 3 and the pedal simulator cylinder 4, stepping on the brake pedal 11, driving the piston in the single-chamber brake master cylinder 3 to move, and introducing the brake fluid in the single-chamber brake master cylinder 3 through the hydraulic connecting line 22 and multiple wheel-side brake lines 21 into multiple wheel-side brake calipers.

[0043] The control method of the wire-controlled hydraulic brake includes: cutting off the connection between the hydraulic connecting pipeline 22 and the multiple wheel-side brake pipelines 21, stepping on the brake pedal 11, driving the piston in the booster mechanism to move, and the booster mechanism introduces the brake fluid into the multiple wheel-side brake calipers through the multiple wheel-side brake pipelines 21.

[0044] The single-chamber master cylinder hydraulic brake system, control method and vehicle body arrangement structure designed by the present invention are further described in detail below with reference to the accompanying drawings.

[0045] like Figure 1As shown, the single-chamber master cylinder wire-controlled hydraulic brake system designed by the present invention comprises an independent master cylinder and pedal simulator integrated module (first module 1), an integrated brake booster module (second module 2) and a hydraulic connection pipeline 22. The master cylinder and pedal simulator integrated module integrates the mechanical structure of the single-chamber brake master cylinder 3, the pedal simulator cylinder 4 and the master cylinder reservoir 6. The single-chamber brake master cylinder 3 and the pedal simulator cylinder 4 share the same cylinder mold. After the cylinder mold is opened, the master cylinder cylinder hole and the pedal simulator cylinder hole are machined, and the master cylinder piston, spring, leather cup and the pedal simulator piston, spring combination, leather cup and the master cylinder reservoir 6 are assembled to obtain the master cylinder and pedal simulator integrated module. The master cylinder reservoir 6 comprises an oil outlet for supplying oil to the booster mechanism replenishing tank 7 of the integrated brake booster module, and a filling port is provided for filling the brake system brake fluid.

[0046] The integrated brake booster module includes four wheel-side brake pipelines 21, which guide the brake fluid into the wheel-side brake calipers to achieve wire-controlled hydraulic braking. Every two wheel-side brake pipelines 21 are integrated into a wheel-side pipeline module to form two wheel-side pipeline modules. Both wheel-side pipeline modules are connected to the single-chamber brake master cylinder 3 and the booster cylinder 5. The single-chamber brake master cylinder 3 can input brake fluid to the two wheel-side pipeline modules to achieve mechanical backup braking, and the booster cylinder 5 can also input brake fluid to the two wheel-side pipeline modules to achieve wire-controlled hydraulic braking.

[0047] The integrated brake booster module obtains the input stroke signal of the brake pedal 11, opens the first booster cylinder isolation solenoid valve 16 and the second booster cylinder isolation solenoid valve 17, drives the piston of the booster cylinder 5 through the motor transmission mechanism 15, and establishes brake hydraulic pressure in the booster cylinder 5. The booster cylinder 5 is connected to the wheel brake caliper through the booster valve 18 and the wheel brake pipeline 21, and the wheel is braked. After the braking is completed, the brake fluid returns to the booster cylinder 5 along the original route. The booster cylinder 5 is connected to the booster mechanism replenishing tank 7, and the booster mechanism replenishing tank 7 replenishes the brake fluid in the booster cylinder 5.

[0048] The pressure-building chamber of the single-chamber brake master cylinder 3 is connected to the wheel-side brake caliper through the first master cylinder isolation solenoid valve 13, the second master cylinder isolation solenoid valve 14, the booster valve 18 and the four wheel-side brake lines 21 to apply brakes to the wheel. The pressure-building chamber of the single-chamber brake master cylinder 3 is connected to the pedal simulator cylinder 4 through the first brake hydraulic line 8 and the second brake hydraulic line 9, and the on-off is controlled by the pedal simulator solenoid valve 10.

[0049] When the wire-controlled power-assisted braking fails (such as vehicle power failure, motor failure, etc.), the pedal simulator solenoid valve 10 is closed, and the first master cylinder isolation solenoid valve 13 and the second master cylinder isolation solenoid valve 14 are opened. The pedal simulator cavity is isolated from the master cylinder pressure-building cavity, and the wheel side is braked by building pressure through the single-chamber brake master cylinder 3. The driver steps on the brake pedal 11, builds pressure in the single-chamber brake master cylinder 3, and introduces the brake fluid into the two wheel side pipeline modules to achieve a backup braking deceleration of 0.5g. Optionally, in order to shorten the stroke of the master cylinder, the master cylinder pressure-building cavity can be designed to only build pressure for a single brake circuit to meet 2.44m / s 2 The above mechanical backup brake realizes mechanical backup brake.

[0050] The master cylinder and pedal simulator integrated module can be designed in series. In actual application, according to the brake pedal feel and backup brake deceleration requirements, the cylinder diameter of the single-chamber brake master cylinder 3 can be designed to be 19.05 / 20.64 / 23.81 / 25.4mm and the master cylinder piston stroke can be designed to be 36 / 38 / 40 / 42.

[0051] The cylinder diameter of the pedal simulator cylinder 4 can be designed to be 23.81 / 25.4 / 27.99 mm, etc., and the stroke of the pedal simulator piston can be serially designed to match the pedal feel requirements.

[0052] The stiffness and preload of the master cylinder spring and simulator spring combination all support customized matching design, so that the brake pedal feel fully meets the target requirements of the vehicle manufacturer.

[0053] The master cylinder and pedal simulator integrated module is completely independent from the integrated brake booster module, and the two are decoupled in development and manufacturing. Vehicle manufacturers can entrust different parts suppliers to carry out development and manufacturing and assemble them in the vehicle assembly workshop.

[0054] The boost cylinder 5 of the integrated brake booster module can be designed as a platform. One boost cylinder 5 can basically cover the vehicle requirements of 3.5-4t and below, and realize 1-2 specifications to adapt to all vehicle requirements, with high universality and modularity. The integrated brake booster module eliminates the push rod connected to the brake pedal 11, and does not contain the single-chamber brake master cylinder 3 and pedal simulator cylinder 4 related to the pedal feel. The booster mechanism refill tank 7 adopts the solution of installing a universal small oil pot on the valve block, thereby universalizing the integrated brake booster module. The small oil pot is connected to the large oil pot (master cylinder reservoir 6) on the single-chamber brake master cylinder 3 through a rubber tube, and the master cylinder reservoir 6 refills the booster mechanism refill tank 7.

[0055] Figure 2The present invention is a vehicle body layout structure of a single-chamber master cylinder wire-controlled hydraulic brake system. The integrated brake booster module and the master cylinder and pedal simulator integrated module are independently arranged. The integrated brake booster module is installed on a structural member with good rigidity such as a vehicle body reinforcement beam. The master cylinder and pedal simulator integrated module is installed on the vehicle body firewall and is connected to the firewall and the brake pedal 11 through two studs. Compared with the solution in the prior art that the integrated brake booster module is fixed by four studs, two studs can be reduced. The integrated brake booster module is connected to the master cylinder and pedal simulator integrated module through the first brake hydraulic pipeline 8 and the second brake hydraulic pipeline 9. In order to ensure the flow of the hydraulic pipeline, a brake pipe of φ6.35mm is generally selected.

[0056] In summary, the present invention divides the wire-controlled hydraulic brake system of the single-chamber master cylinder into two integrated modules, and connects the two integrated modules through a hydraulic connecting line 22, and the two integrated modules are independently arranged. The pressure-building chamber of the single-chamber brake master cylinder 3 is connected to the cavity of the pedal simulator cylinder 4 through a hydraulic connecting line 22, and the on-off of the pressure-building chamber of the single-chamber brake master cylinder 3 and the brake circuit is controlled by a solenoid valve system, which significantly improves the universality and modularity of the integrated brake booster module and reduces the cost on a large scale. The master cylinder and pedal simulator integrated module can be customized to meet the pedal feel target requirements of the vehicle model. At the same time, it solves the NVH problems caused by the volume occupation interference and weight cantilever installation of the integrated brake booster module.

[0057] Here, it should be noted that the description of the above technical solution is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solution set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, another part or other parts may also be provided, and the terms used may generally be singular but may also represent plural forms. It should be noted that although the terms "first", "second", "top", "bottom", "one side", "other side", "one end", "other end", etc. may appear and be used in this specification to describe various different components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component, and the components at the top and bottom may also be interchanged or converted with each other under certain circumstances; the components at one end and the other end may have the same or different performances. Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A single-chamber master cylinder hydraulic brake system controlled by wire, characterized in that: It comprises a first module (1), a second module (2) and a hydraulic connection pipeline (13) connected between the first module (1) and the second module (2); The first module (1) comprises a single-chamber brake master cylinder (3) having a single pressure-building chamber and a piston input rod fixedly connected to a brake pedal (11), a pedal simulator cylinder (4) integrated with the single-chamber brake master cylinder (3), and a master cylinder reservoir (6) for storing and replenishing brake fluid to the single-chamber brake master cylinder (3); The second module (2) comprises a plurality of wheel-side brake pipelines (21) respectively connected to the plurality of wheel-side brake calipers; a booster mechanism connected to the plurality of wheel-side brake pipelines (21) and capable of introducing brake fluid through the plurality of wheel-side brake pipelines (21) into the plurality of wheel-side brake calipers for hydraulic braking by wire; and a booster mechanism replenishing tank (7) for storing and replenishing brake fluid to the booster mechanism; The hydraulic connection pipeline (22) includes a hydraulic pipeline connected to the plurality of wheel-side brake pipelines (21) and capable of introducing the brake fluid of the brake master cylinder into the plurality of wheel-side brake calipers through the plurality of wheel-side brake pipelines (21) for mechanical backup braking; A pipeline is connected between the master cylinder liquid storage tank (6) and the booster mechanism liquid replenishing tank (7).

2. The single-chamber master cylinder hydraulic brake system according to claim 1, characterized in that: The pedal simulator cylinder (4) is connected to the single-chamber brake master cylinder (3) via the hydraulic connecting pipeline (22), and the hydraulic connecting pipeline (22) can introduce the brake fluid of the single-chamber brake master cylinder (3) into the pedal simulator cylinder (4) to provide braking force feedback to the brake pedal (11).

3. The single-chamber master cylinder hydraulic brake system according to claim 2, characterized in that: The hydraulic connecting pipeline (22) includes a first brake hydraulic pipeline (8) for connecting the pressure-building chamber of the single-chamber brake master cylinder (3) and the plurality of wheel-side brake pipelines (21), and a second brake hydraulic pipeline (9) for connecting the pedal simulator cylinder (4) with the first brake hydraulic pipeline (8).

4. The single-chamber master cylinder hydraulic brake system according to claim 1, characterized in that: Each of the wheel-side brake pipelines (21) is connected to an ABS return fluid channel (23), and the ABS return fluid channel (23) is in communication with the booster mechanism fluid replenishment tank (7).

5. A control method for a wire-controlled hydraulic brake system based on a single-chamber master cylinder according to any one of claims 1 to 4, characterized in that: It comprises a pedal feel simulation control method for a single-chamber brake master cylinder (3), which comprises: cutting off the connection between the hydraulic connection pipeline (22) and the plurality of wheel-side brake pipelines (21), stepping on the brake pedal (11), driving the piston in the single-chamber brake master cylinder (3) to move, introducing the brake fluid in the single-chamber brake master cylinder (3) into the pedal simulator cylinder (4) through the hydraulic connection pipeline (22) to generate pedal force feedback, and designing and matching the single-chamber brake master cylinder (3) and the pedal simulator cylinder (4) according to the pedal force feedback so that the pedal feel reaches the design target.

6. The control method of the wire-controlled hydraulic brake system of the single-chamber master cylinder according to claim 5, characterized in that: The pedal feel simulation control method of the single-chamber brake master cylinder (3) also includes: obtaining the stroke of the brake pedal (11), and proportionally introducing the brake fluid in the booster mechanism into the wheel-side brake caliper according to the stroke of the brake pedal (11).

7. The control method of the single-chamber master cylinder hydraulic brake system according to claim 5, characterized in that: It also includes a control method for wire-controlled hydraulic braking, which includes: cutting off the connection between the hydraulic connecting pipeline (22) and the multiple wheel-side brake pipelines (21), stepping on the brake pedal (11), driving the piston in the boosting mechanism to move, and the boosting mechanism introduces the brake fluid into the multiple wheel-side brake calipers through the multiple wheel-side brake pipelines (21).

8. The control method of the single-chamber master cylinder hydraulic brake system according to claim 5, characterized in that: It also includes a control method for mechanical backup braking, which includes: cutting off the hydraulic connection pipeline between the single-chamber brake master cylinder (3) and the pedal simulator cylinder (4), stepping on the brake pedal (11), driving the piston in the single-chamber brake master cylinder (3) to move, and introducing the brake fluid in the single-chamber brake master cylinder (3) through the hydraulic connection pipeline (22) and multiple wheel-side brake pipelines (21) into multiple wheel-side brake calipers.

9. A vehicle body arrangement structure of a wire-controlled hydraulic brake system of a single-chamber master cylinder, comprising a vehicle body (24), characterized in that: It includes a wire-controlled hydraulic brake system of a single-chamber master cylinder as described in any one of claims 1 to 4 above, wherein the first module (1) and the second module (2) are respectively installed on different structural parts of the vehicle body (24), and the hydraulic connecting pipeline (22) is connected between the first module (1) and the second module (2).

10. The vehicle body arrangement structure of the wire-controlled hydraulic brake system of the single-chamber master cylinder as claimed in claim 9, characterized in that: The first module (1) is mounted on a vehicle body firewall.

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