Three-channel integrated braking system

Abstract

The invention discloses a three-channel integrated brake system, which comprises a hydraulic oil tank, the hydraulic oil tank is connected with the diagnostic valve and connected with the main cylinder through the diagnostic valve, the output end of the main cylinder is connected with the main cylinder isolating valve, the main cylinder isolating valve controls brake circuits of two axles of an automobile respectively, and the brake circuits comprise the first brake circuit and the second brake circuit. The number of the main cylinder isolating valves is two, and the brake circuit is provided with three pressure increasing valves and three pressure reducing valves. And at least one pressure increasing valve is arranged on the first brake loop and the second brake loop. A brake system is designed, a brake loop of an automobile is adjusted through a main cylinder isolating valve, three pressure increasing valves and three pressure reducing valves, brake control over automobile wheel cylinders is achieved, and the requirements for shortening the brake distance and guaranteeing steering operability and driving stability in the brake process can be met under most conditions; and compared with four channels, the number of required electromagnetic valves and the like can be reduced, so that the production cost is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile brake control, and in particular to a three-channel integrated brake system. Background Art

[0002] In the traditional braking system, the vacuum booster responsible for building up pressure is used in conjunction with the ESC / ABS system responsible for adjusting wheel-end pressure. The working principle of the vacuum booster is to use a certain cross-section of vacuum to generate thrust, amplify the braking force applied by the driver, generate greater braking hydraulic pressure, and thus generate sufficient wheel-side braking force. The ESC / ABS system works through a combination of solenoid valves and other hydraulic components to independently control the increase and decrease pressure of each wheel to achieve anti-lock braking, body stability control, automatic parking and other functions.

[0003] As automotive technology continues to advance, integrated brake systems have been invented to replace the performance and functions that can be achieved by the vacuum booster and ESC / ABS system combination.

[0004] The existing integrated braking system is composed of at least 14 solenoid valves (8 boost valves and pressure reducing valves for four wheels, 4 isolation valves for the pressure building mechanism and the hydraulic master cylinder, diagnostic valve and pedal switch valve) or more. Since the solenoid valve is a component with high requirements for design, manufacturing and assembly, it accounts for a large proportion of the product cost. The use of more solenoid valves has a certain impact on the hydraulic transmission process in the entire brake circuit. Fewer solenoid valves can easily lead to higher pressure in the master cylinder or wheel cylinder during hydraulic braking, which is easily damaged by hydraulic shock. More solenoid valves will lead to complex design of the brake circuit body, higher linkage control requirements, and difficulty in repair when a fault occurs. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a three-channel integrated braking system.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a three-channel integrated braking system, comprising:

[0007] Hydraulic oil tank;

[0008] The hydraulic oil tank is connected to a diagnostic valve, which is connected to a master cylinder through the diagnostic valve, and an output end of the master cylinder is connected to a master cylinder isolation valve, which controls the brake circuits of two axles of the vehicle respectively, and the brake circuits include a first brake circuit and a second brake circuit;

[0009] The master cylinder isolation valves are provided with two, and the brake circuit is provided with three boost valves and three pressure reducing valves;

[0010] At least one pressure boosting valve is disposed on the first brake circuit and the second brake circuit.

[0011] As a further description of the above technical solution: the second brake circuit is provided with two boost valves, the two boost valves are connected to the vehicle wheel cylinders on the second brake circuit, and the other boost valve is connected to the vehicle wheel cylinder on the first brake circuit.

[0012] As a further description of the above technical solution: the three pressure reducing valves are connected to the hydraulic oil tank, the two vehicle wheel cylinders on the second brake circuit are jointly controlled by the two boosting valves and the two pressure reducing valves, and another pressure reducing valve is connected to the first brake circuit, and controls the two vehicle wheel cylinders of the first brake circuit respectively together with the boosting valve of the first brake circuit.

[0013] As a further description of the above technical solution: the output end of the hydraulic oil tank is also connected to a pedal simulator, the output end of the pedal simulator is connected to a pedal simulator switch valve to control the connectivity of the pedal simulator, and the pedal simulator switch valve is connected to the master cylinder isolation valve of the second brake circuit.

[0014] As a further description of the above technical solution: a first pressure sensor is arranged between the master cylinder isolation valve of the first brake circuit and the master cylinder.

[0015] As a further description of the above technical solution: the first brake circuit includes a booster valve, which is connected in series with the vehicle wheel cylinder, and the first brake circuit also includes a pressure reducing valve, which is connected in series with another vehicle wheel cylinder.

[0016] As a further description of the above technical solution: the second brake circuit includes a pressure building module, the pressure building module is connected in parallel with the two boosting valves, the two boosting valves are respectively connected to the two vehicle wheel cylinders in the second brake circuit, and a pressure reducing valve is connected in parallel between the boosting valve and the vehicle wheel cylinder.

[0017] As a further description of the above technical solution: the pressure building module includes two pressure building isolation valves, and the two pressure building isolation valves are connected in parallel and connected to the active pressure building mechanism.

[0018] As a further description of the above technical solution: a second pressure sensor is provided at the input end of the active pressure building mechanism, and the hydraulic oil tank is connected to the active pressure building mechanism via a one-way valve.

[0019] As a further description of the above technical solution: one side of the master cylinder is connected to a pedal push rod, and a displacement sensor is arranged on the pedal push rod.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] 1. By designing the braking system, the braking circuit of the automobile is adjusted through the master cylinder isolation valve, three boost valves and three pressure reducing valves to realize the braking control of the automobile wheel cylinder. In most cases, it can meet the requirements of shortening the braking distance and ensuring the steering operability and driving stability during braking. Compared with the four-channel system, it can reduce the number of required solenoid valves, etc., so that the production cost is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the three-channel integrated braking system proposed in the present invention.

[0023] Legend:

[0024] 1. Hydraulic oil tank; 2. Diagnostic valve; 3. Master cylinder; 4. Master cylinder isolation valve; 5. Boost valve; 6. Pressure reducing valve; 7. Automobile wheel cylinder; 8. Pedal simulator; 9. Pedal simulator switch valve; 10. First pressure sensor; 11. Pressure building module; 111. Pressure building isolation valve; 112. Active pressure building mechanism; 113. Second pressure sensor; 12. Pedal push rod; 13. Displacement sensor. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Reference Figure 1 An embodiment of the present invention is as follows: a three-channel integrated braking system, comprising: a hydraulic oil tank 1; the hydraulic oil tank 1 is connected to a diagnostic valve 2, which is connected to a master cylinder 3 through the diagnostic valve 2, the output end of the master cylinder 3 is connected to a master cylinder isolation valve 4, the master cylinder isolation valve 4 controls the braking circuits of two axles of the vehicle respectively, and the braking circuit includes a first braking circuit and a second braking circuit; two master cylinder isolation valves 4 are provided, and the braking circuit is provided with three boost valves 5 and three pressure reducing valves 6, and at least one boost valve 5 is provided on the first braking circuit and the second braking circuit.

[0027] In this embodiment, the driver performs braking control through the brake pedal, so that the volume of the rod chamber in the master cylinder changes, which is judged by the diagnostic valve 2. When the opening of the diagnostic valve 2 is greater than a certain threshold, that is, the brake pedal is stepped on, the car brakes, and the brake fluid in the hydraulic oil tank 1 enters the car wheel cylinder 7 through the master cylinder 3, the master cylinder isolation valve 4, the boost valve 5 and the pressure reducing valve 6 for braking control. In the braking circuit, through the coaxial control method, that is, the two car wheel cylinders 7 of one axis of the four wheels are jointly controlled by the two boost valves 5 and the two pressure reducing valves 6, the first braking circuit controls the front wheel car wheel cylinder for braking, and the second braking circuit controls the rear wheel car wheel cylinder for braking.

[0028] The inventors have found in their research that when the braking system of the present invention is applied to a truck, the two rear wheels can be independently controlled (each using one channel for the two rear wheels), and the two front wheels can be highly selectively controlled (the two front wheels share one channel). When applied to a car, the two front wheels can be independently controlled (each using one channel for the two front wheels), and the two rear wheels can be highly selectively controlled (the two rear wheels share one channel). This can effectively maintain directional stability and maneuverability during braking and shorten the braking distance. The schematic diagram of this application uses a car as an example to illustrate the braking system. The design scheme of the present application is no different from the existing integrated braking system in the control method under the working conditions where the wheel cylinder pressure does not need to be controlled separately, such as conventional braking, automatic parking, etc.; under the working conditions where the wheel cylinder pressure needs to be controlled separately, such as ABS anti-lock braking function, the two-wheel cylinders with coaxial control adopt a low-selection control strategy, that is, the pressure targets of the left and right wheels are calculated respectively according to the wheel slip rate (obtained by table lookup) (which can be deduced from the slip rate calculation formula), and the lower value is taken as the pressure target for coaxial control, and then the boost valve 5 and the pressure reducing valve 6 cooperate with the action of the active pressure building mechanism 112 to perform braking.

[0029] In the failure backup mode, its performance is no different from the existing integrated braking system, that is, all solenoid valves are not powered on, and braking is only achieved by the driver stepping on the brake pedal, which can meet the braking standards.

[0030] The second brake circuit is provided with two booster valves, the two booster valves 5 are connected to the vehicle wheel cylinders 7 on the second brake circuit, and the other booster valve 5 is connected to the vehicle wheel cylinders 7 on the first brake circuit.

[0031] In this embodiment, taking the design of a car as an example, during the process of braking control of the rear wheels, two boost valves 5 are provided in the second brake circuit, which are connected to two wheel cylinders 7 for boost braking. A pressure reducing valve 6 is designed in parallel on one side of the boost valve 5. When the hydraulic pressure of the wheel cylinder 7 is relatively large, power is turned on. The pressure reducing valve 6 is in the disconnected position in the power-off state and is turned on after power is turned on, so that the brake fluid flows back to the hydraulic oil tank 1.

[0032] Three pressure reducing valves 6 are connected to the hydraulic oil tank 1. The two vehicle wheel cylinders 7 on the second brake circuit are controlled by two boost valves 5 and two pressure reducing valves 6. Another pressure reducing valve 6 is connected to the first brake circuit and controls the two vehicle wheel cylinders 7 of the first brake circuit respectively together with the boost valve 5 of the first brake circuit.

[0033] In this embodiment, when braking, the two wheel cylinders 7 of the second brake circuit brake the two wheel cylinders of the rear wheels through the boost valve 5 and the pressure reducing valve 6, and at the same time, the first brake circuit controls the braking of one of the wheel cylinders 7 of the front wheel through a boost valve 5. When the hydraulic pressure is large, the pressure reducing valve 6 is electrically connected, and the brake fluid flows back to the hydraulic oil tank 1 in one way, and can also flow into the other wheel cylinder 7 of the front wheel through another pressure reducing valve 6 for braking control in the other way. While ensuring the braking effect, the braking control can be performed according to the hydraulic pressure classification in the brake circuit.

[0034] The output end of the hydraulic oil tank 1 is also connected to the pedal simulator 8, and the output end of the pedal simulator 8 is connected to the pedal simulator switch valve 9 to control the connectivity of the pedal simulator 8. The pedal simulator switch valve 9 is connected to the master cylinder isolation valve 4 of the second brake circuit.

[0035] In this embodiment, a failed brake backup is performed through the pedal simulator 8. The driver steps on the brake pedal to drive the pedal push rod 12 to move. The pedal push rod 12 is arranged on one side of the master cylinder 3. A displacement sensor 13 is arranged on the pedal push rod 12 to monitor the displacement and output a displacement acquisition signal. Braking is performed by delivering brake fluid through the master cylinder 3. At the same time, the hydraulic oil tank 1 delivers brake fluid to the pedal simulator 8 for braking simulation. At this time, the pedal simulator switch valve 9 is electrically conductive, so that the simulated brake fluid signal enters the second brake circuit and is connected to the pressure building module 11 through the master cylinder isolation valve 4.

[0036] A first pressure sensor 10 is provided between the master cylinder isolation valve 4 and the master cylinder 3 of the first brake circuit. The first pressure sensor 10 is used to monitor the hydraulic pressure in the first brake circuit. During the braking process, the hydraulic pressure between the master cylinder 3 and the master cylinder isolation valve 4 is monitored by the first pressure sensor 10 to obtain the hydraulic pressure used for braking in the first brake circuit. During the braking process, if the hydraulic pressure exceeds a certain threshold, the pressure reducing valve 6 is opened to balance the hydraulic pressure in the first brake circuit.

[0037] The first brake circuit includes a pressure-increasing valve 5 , which is connected in series with a wheel cylinder 7 of the vehicle. The first brake circuit also includes a pressure-reducing valve 6 , which is connected in series with another wheel cylinder 7 of the vehicle.

[0038] In this embodiment, the master cylinder isolation valve 4 is connected to the boosting valve 5 of the first brake circuit, and is connected through the boosting valve 5. The boosting valve 5 is connected to the vehicle wheel cylinder 7 for pressurized braking. Another vehicle wheel cylinder 7 in the first brake circuit is connected in series with the pressure reducing valve 6. After the pressure reducing valve 6 is powered on, pressure is divided in a larger hydraulic environment to perform hydraulic braking.

[0039] The second brake circuit includes a pressure building module 11 , which is connected in parallel with two boost valves 5 , which are respectively connected to two wheel cylinders 7 in the second brake circuit, and a pressure reducing valve 6 is connected in parallel between the boost valve 5 and the wheel cylinder 7 .

[0040] In this embodiment, one side of the second brake circuit is connected to the pressure building module 11, and the pressure building module 11 is used to perform pressure building backup for the second brake circuit in case of failure. The vehicle wheel cylinder 7 is connected via the boost valve 5. While performing braking control, the pressure building module 11 is connected to the second brake circuit, and the backup pressure is built up with the same hydraulic pressure as in the second brake circuit.

[0041] The pressure building module 11 includes two pressure building isolation valves 111 , which are connected in parallel and connected to an active pressure building mechanism 112 .

[0042] In this embodiment, two pressure-building isolation valves 111 are used in one and reserved in the other, and can also be used at the same time. The pressure-building isolation valve 111 is connected to the active pressure-building mechanism 112. The active pressure-building mechanism 112 includes a motor, a transmission mechanism, and a plunger. The motor is a power source. The transmission mechanism converts the rotational motion of the motor into appropriate linear motion and pushes the plunger piston to build pressure. The transmission mechanism can be a crank rocker mechanism (not shown). The plunger pressurizes the brake fluid and transmits it to each wheel to achieve braking.

[0043] A second pressure sensor 113 is provided at the input end of the active pressure building mechanism 112 , and the hydraulic oil tank 1 is connected to the active pressure building mechanism 112 via a one-way valve.

[0044] In this embodiment, the hydraulic pressure in the second brake circuit is monitored by the second pressure sensor 113, and the pressure reducing valve 6 is connected to the hydraulic oil tank 1 and the input end of the active pressure building mechanism 112, so that the hydraulic pressure in the active pressure building mechanism 112 is balanced with the hydraulic pressure in the second brake circuit.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-channel integrated braking system, characterized in that: include: Hydraulic oil tank (1); The hydraulic oil tank (1) is connected to a diagnostic valve (2), which is connected to a master cylinder (3) via the diagnostic valve (2); an output end of the master cylinder (3) is connected to a master cylinder isolation valve (4); the master cylinder isolation valve (4) controls the brake circuits of two axles of the vehicle respectively, and the brake circuits include a first brake circuit and a second brake circuit; The master cylinder isolation valves (4) are provided with two, and the brake circuit is provided with three boost valves (5) and three pressure reducing valves (6); At least one pressure-boosting valve (5) is provided on the first brake circuit and the second brake circuit.

2. A three-channel integrated braking system according to claim 1, characterized in that: The second brake circuit is provided with two booster valves, the two booster valves (5) are connected to the vehicle wheel cylinder (7) on the second brake circuit, and the other booster valve (5) is connected to the vehicle wheel cylinder (7) on the first brake circuit.

3. A three-channel integrated brake system according to claim 2, characterized in that: The three pressure reducing valves (6) are connected to the hydraulic oil tank (1); the two vehicle wheel cylinders (7) on the second brake circuit are controlled by the two pressure boosting valves (5) and the two pressure reducing valves (6); another pressure reducing valve (6) is connected to the first brake circuit and controls the two vehicle wheel cylinders (7) of the first brake circuit respectively together with the pressure boosting valve (5) of the first brake circuit.

4. A three-channel integrated brake system according to claim 1, characterized in that: The output end of the hydraulic oil tank (1) is also connected to a pedal simulator (8), and the output end of the pedal simulator (8) is connected to a pedal simulator switch valve (9) to control the connection of the pedal simulator (8), and the pedal simulator switch valve (9) is connected to a master cylinder isolation valve (4) of a second brake circuit.

5. The three-channel integrated brake system according to claim 2, characterized in that: A first pressure sensor (10) is provided between the master cylinder isolation valve (4) of the first brake circuit and the master cylinder (3).

6. A three-channel integrated brake system according to claim 5, characterized in that: The first brake circuit comprises a pressure-increasing valve (5), which is connected in series with the vehicle wheel cylinder (7); the first brake circuit also comprises a pressure-reducing valve (6), which is connected in series with another vehicle wheel cylinder (7).

7. The three-channel integrated brake system according to claim 1, characterized in that: The second brake circuit comprises a pressure building module (11), the pressure building module (11) is connected in parallel with the two pressure boosting valves (5), the two pressure boosting valves (5) are respectively connected to two vehicle wheel cylinders (7) in the second brake circuit, and a pressure reducing valve (6) is connected in parallel between the pressure boosting valve (5) and the vehicle wheel cylinder (7).

8. A three-channel integrated brake system according to claim 7, characterized in that: The pressure building module (11) comprises two pressure building isolation valves (111), and the two pressure building isolation valves (111) are connected in parallel and connected to the active pressure building mechanism (112).

9. A three-channel integrated brake system according to claim 8, characterized in that: The input end of the active pressure building mechanism (112) is provided with a second pressure sensor (113), and the hydraulic oil tank (1) is connected to the active pressure building mechanism (112) via a one-way valve.

10. The three-channel integrated brake system according to claim 1, characterized in that: One side of the master cylinder (3) is connected to a pedal push rod (12), and a displacement sensor (13) is arranged on the pedal push rod.

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