Decoupling type brake-by-wire system

Abstract

The utility model provides a decoupling type brake-by-wire system which comprises an external liquid storage pot, a split type main cylinder assembly, a brake hard pipe and an external pressure buildup unit assembly, and the liquid storage pot is connected with the external pressure buildup unit assembly through a brake hose; the split type main cylinder assembly comprises a brake main cylinder SC, a brake main cylinder PC, a pedal displacement sensor and a pedal connector. A pressure building unit is arranged at one end of the brake master cylinder SC, a master cylinder two-cavity pressure sensor and a two-cavity isolating valve module are sequentially arranged between the brake master cylinder SC and the pressure building unit, and the two-cavity isolating valve module is connected with a second wheel oil outlet module; one end of the brake master cylinder PC is connected with the pressure buildup unit, a first cavity isolation valve module is sequentially arranged between the brake master cylinder PC and the pressure buildup unit, and the first cavity isolation valve module is connected with the first wheel oil outlet module. According to the decoupling type brake-by-wire system, the arrangement problem of an EHB product at a whole vehicle end is solved, and meanwhile noise generated by control is reduced.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic brake-by-wire systems, in particular to a decoupled brake-by-wire system. Background Art

[0002] EHB is developed on the basis of the traditional hydraulic brake system. It uses a comprehensive brake module (motor, transmission structure, pressure supply unit, solenoid valve, etc.) to replace the pressure regulation system and ABS module in the traditional brake system, generating higher brake pressure and adjusting the braking torque of the four tires separately.

[0003] Compared with the traditional hydraulic brake system, the EHB system has made significant progress. It has a compact structure, high integration, improved braking efficiency, convenient and reliable control, significantly reduced braking noise, no need for a vacuum device, effectively reducing the need to apply the brake pedal, and providing a better pedal feel.

[0004] EHB products are similar to traditional hydraulic brake systems and need to be installed in a fixed position on the vehicle firewall. Since the EHB motor and ECU are large in size, they require a large installation space. At the same time, the weight of the EHB product is close to 6kg, which requires a high strength of the firewall. Therefore, some models cannot install EHB products.

[0005] The EHB product needs to control the movement of the motor and transmission structure, and also needs to control the solenoid valve switch to achieve some braking functions, so there is perceptible noise. Utility Model Content

[0006] The purpose of the utility model is to provide a decoupled wire-controlled brake system and to design a split structure, which can be suitable for vehicles with small installation space at the vehicle end, solves the layout problem of EHB products at the vehicle end, and has a lower noise level.

[0007] To achieve the above object, the utility model provides a decoupled wire-controlled brake system, including an external fluid reservoir, a split master cylinder assembly, a brake hard pipe, and an external pressure-building unit assembly, characterized in that:

[0008] The fluid storage pot is connected to the external pressure building unit assembly via a brake hose;

[0009] The split master cylinder assembly includes a brake master cylinder, a pedal displacement sensor and a pedal interface;

[0010] The brake master cylinder includes a brake master cylinder SC and a brake master cylinder PC;

[0011] A pressure building unit is provided at one end of the brake master cylinder SC, and a master cylinder two-chamber pressure sensor and a two-chamber isolation valve module are sequentially provided between the brake master cylinder SC and the pressure building unit, and the two-chamber isolation valve module is connected to the second wheel oil outlet module;

[0012] One end of the master brake cylinder PC is connected to a pressure building unit, and a chamber isolation valve module is sequentially arranged between the master brake cylinder PC and the pressure building unit, and the chamber isolation valve module is connected to a first wheel oil outlet module.

[0013] Preferably, the one-chamber isolation valve module includes a master cylinder one-chamber isolation valve and a pressure building unit one-chamber isolation valve, and the brake master cylinder PC, the master cylinder one-chamber isolation valve, the pressure building unit one-chamber isolation valve, and the pressure building unit are connected in sequence;

[0014] The two-chamber isolation valve module includes a master cylinder two-chamber isolation valve and a pressure building unit two-chamber isolation valve. The brake master cylinder SC, the master cylinder two-chamber pressure sensor, the master cylinder two-chamber isolation valve, the pressure building unit two-chamber isolation valve, and the pressure building unit are connected in sequence.

[0015] Preferably, the first wheel group oil outlet module includes a left rear wheel liquid inlet valve connected to a left rear wheel liquid outlet valve arranged at one end thereof, the left rear wheel liquid inlet valve is connected to a right front wheel liquid inlet valve arranged at one end thereof, the right front wheel liquid inlet valve is connected to a right front wheel liquid outlet valve arranged at one end thereof, the left rear wheel liquid inlet valve and the right front wheel liquid inlet valve are both connected to a two-chamber isolation valve module, and the left rear wheel liquid outlet valve and the right rear wheel liquid outlet valve are both connected to an external liquid storage pot.

[0016] Preferably, the second wheel group oil outlet module includes a left front wheel liquid inlet valve connected to a left front wheel liquid outlet valve arranged at one end thereof, the left front wheel liquid inlet valve is connected to a right rear wheel liquid inlet valve arranged at one end thereof, the right rear wheel liquid inlet valve is connected to a right rear wheel liquid outlet valve arranged at one end thereof, the left front wheel liquid inlet valve and the right rear wheel liquid inlet valve are both connected to a chamber isolation valve module, and the right rear wheel liquid inlet valve and the right rear wheel liquid outlet valve are both connected to an external liquid storage pot.

[0017] Preferably, the right front wheel liquid outlet valve and the left rear wheel liquid outlet valve are both connected to an external liquid storage pot; an RL oil outlet is provided between the left rear wheel liquid inlet valve and the left rear wheel liquid outlet valve, and an FR oil outlet is provided between the right front wheel liquid inlet valve and the right front wheel liquid outlet valve.

[0018] Preferably, the left front wheel liquid outlet valve and the right rear wheel liquid outlet valve are both connected to an external liquid storage pot, an FL oil outlet is provided between the left front wheel liquid inlet valve and the left front wheel liquid outlet valve, and an RR oil outlet is provided between the right rear wheel liquid inlet valve and the right rear wheel liquid outlet valve.

[0019] Preferably, the external fluid storage pot is connected to the pressure building unit, and a pedal simulator module is also arranged between the external fluid storage pot and the pressure building unit. The pedal simulator module is also connected to the brake master cylinder PC and the master cylinder chamber isolation valve. The pedal simulator module includes a pedal simulator isolation valve and a pedal simulator assembly.

[0020] Preferably, the external liquid storage pot comprises a two-chamber structure, including a first liquid storage pot chamber and a second liquid storage pot chamber, and the first liquid storage pot chamber is connected to the pedal interface through a brake hose.

[0021] Preferably, a one-way valve assembly is provided between the second chamber of the liquid storage pot and the pressure building unit.

[0022] Preferably, the pressure building unit is also provided with a motor position sensor and a pressure building unit pressure sensor.

[0023] Therefore, the utility model adopts the above-mentioned decoupled wire control braking system, and the technical effects are as follows: a split structure is designed, which can be suitable for vehicles with small installation space on the vehicle end, solves the layout problem of EHB products on the vehicle end, and has a lower noise level. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model is a schematic diagram of a decoupled wire-controlled brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 1. External fluid reservoir; 11. Fluid reservoir chamber 1; 12. Fluid reservoir chamber 2; 13. Brake hose; 2. Split master cylinder assembly; 21. Brake master cylinder; 22. Firewall connecting plate assembly; 23. Pedal interface; 24. Pedal displacement sensor;

[0027] 3. Brake hard pipe; 4. External pressure building unit assembly; 41. Master cylinder two-chamber pressure sensor; 42. Pedal simulator isolation valve; 43. Pedal simulator assembly; 44. Master cylinder one-chamber isolation valve; 45. Motor position sensor; 46. Pressure building unit; 47. One-way valve assembly; 48. Master cylinder two-chamber isolation valve; 49. Pressure building unit two-chamber isolation valve; 50. Pressure building unit one-chamber isolation valve;

[0028] 51. Left rear wheel liquid inlet valve; 52. Right front wheel liquid inlet valve; 53. Pressure building unit pressure sensor; 54. Right rear wheel liquid inlet valve; 55. Left front wheel liquid inlet valve; 56. Left front wheel liquid outlet valve; 57. Right rear wheel liquid outlet valve; 58. Right front wheel liquid outlet valve; 59. Left rear wheel liquid outlet valve; 60. ECU electronic control unit. DETAILED DESCRIPTION

[0029] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0030] Unless otherwise defined, technical or scientific terms used in the present invention should have the common meanings understood by persons having ordinary skills in the field to which the present invention belongs.

[0031] Embodiment 1

[0032] The utility model provides a decoupled wire-controlled braking system, including an external fluid reservoir 1, a split master cylinder assembly 2, a brake hard pipe 3, and an external pressure-building unit assembly 4. The external fluid reservoir 1 can be set to multiple chambers. In this embodiment, the external fluid reservoir 1 is set to a two-chamber structure, including a fluid reservoir chamber 11 and a fluid reservoir chamber 12. The fluid reservoir chamber 11 is connected to the pedal interface 23 through a brake hose 13 to provide brake fluid to the split master cylinder assembly 2. The fluid reservoir chamber 12 is connected to the external pressure-building unit assembly 4 through a brake hose 13 to provide brake fluid to the external pressure-building unit assembly 4. The fluid reservoir chamber 12 is connected to the pressure-building unit 46, and a pedal simulator module is also provided between the external fluid reservoir 1 and the pressure-building unit 46. The pressure-building unit 46 builds up brake pressure.

[0033] The split master cylinder assembly 2 is separated from the EHB and installed on the vehicle firewall. The remaining modules of the EHB are separate structures and can be arranged according to the space of the customer's vehicle.

[0034] The split master cylinder assembly 2 includes a brake master cylinder 21, a firewall connecting plate assembly 22, a pedal displacement sensor 24 and a pedal interface 23; the brake master cylinder 21 includes a brake master cylinder SC and a brake master cylinder PC.

[0035] A brake master cylinder 21 and a pedal displacement sensor 24 are respectively provided on both sides of the firewall connecting plate assembly 22. The brake master cylinder 21 and the pedal displacement sensor 24 are both connected to the pedal interface 23. The pedal simulator module is also connected to the brake master cylinder PC and the master cylinder one-chamber isolation valve 44.

[0036] The pedal simulator module includes a pedal simulator isolation valve 42 that controls the switch of the brake fluid flowing into the simulator component, and a pedal simulator component 43 that provides the driver with a pedal feel.

[0037] The brake master cylinder SC and the brake master cylinder PC convert the driver's input force into output pressure, the firewall connecting plate assembly 22 is connected to the firewall of the whole vehicle, the pedal interface 23 is connected to the pedal of the whole vehicle, and the pedal displacement sensor 24 monitors the displacement of the master cylinder push rod.

[0038] A pressure building unit 46 is provided at one end of the brake master cylinder SC, and a master cylinder two-chamber pressure sensor 41 is provided between the brake master cylinder SC and the pressure building unit 46 to monitor the master cylinder pressure signal and a two-chamber isolation valve module, and the two-chamber isolation valve module is connected to the second wheel oil outlet module;

[0039] The two-chamber isolation valve module includes a master cylinder two-chamber isolation valve 48 to control the flow direction of brake fluid in the two chambers of the split master cylinder, and a pressure building unit two-chamber isolation valve 49 to control the flow direction of brake fluid in the pressure building unit 46. The brake master cylinder SC, the master cylinder two-chamber pressure sensor 41, the master cylinder two-chamber isolation valve 48, the pressure building unit two-chamber isolation valve 49, and the pressure building unit 46 are connected in sequence to control the brake fluid to flow in one direction.

[0040] The second wheel group oil outlet module includes a left front wheel inlet valve 55 connected to a left front wheel outlet valve 56 disposed at one end thereof, the left front wheel inlet valve 55 connected to a right rear wheel inlet valve 54 disposed at one end thereof, the right rear wheel inlet valve 54 connected to a right rear wheel outlet valve 57 disposed at one end thereof, the left front wheel inlet valve 55 and the right rear wheel inlet valve 54 are both connected to a chamber isolation valve module, and the right rear wheel inlet valve 54 and the right rear wheel outlet valve 57 are both connected to an external liquid storage pot 1. The left front wheel inlet valve 55 and the right rear wheel inlet valve 54 are ABS inlet valves, and the left front wheel outlet valve 56 and the right rear wheel outlet valve 57 are ABS outlet valves.

[0041] The left front wheel liquid outlet valve 56 and the right rear wheel liquid outlet valve 57 are both connected to the external liquid storage pot 1, an FL oil outlet is provided between the left front wheel liquid inlet valve 55 and the left front wheel liquid outlet valve 56, and an RR oil outlet is provided between the right rear wheel liquid inlet valve 54 and the right rear wheel liquid outlet valve 57.

[0042] By stepping on the pedal simulator, the master cylinder input push rod is pushed forward. At this time, the master cylinder two-chamber isolation valve 48 is closed, the pressure building unit two-chamber isolation valve 49 is opened, and the pedal simulator isolation valve 42 is opened. The remaining solenoid valves remain unchanged in their original state. Through the signal transmission of the vehicle wiring harness, the ECU electronic control unit 60 of the external pressure building unit assembly 4 detects the displacement of the brake master cylinder push rod, and controls the pressure building unit 46 to build brake pressure. Under the action of the brake master cylinder SC, the oil flows into the FL oil outlet and the RR oil outlet respectively to perform braking. The driver releases the pedal, and the brake fluid returns to the original path according to the brake fluid flow direction in the pressure building state.

[0043] One end of the master cylinder PC is connected to the pressure building unit 46 , and a chamber isolation valve module is sequentially arranged between the master cylinder PC and the pressure building unit 46 , and the chamber isolation valve module is connected to the first wheel oil outlet module.

[0044] The one-chamber isolation valve module includes a master cylinder one-chamber isolation valve 44 to control the flow direction of brake fluid in one chamber of the split master cylinder, and a pressure building unit one-chamber isolation valve 50 to control the flow direction of brake fluid in the pressure building unit 46. The brake master cylinder PC, the master cylinder one-chamber isolation valve 44, the pressure building unit one-chamber isolation valve 50, and the pressure building unit 46 are connected in sequence.

[0045] The first wheel group oil outlet module includes a left rear wheel inlet valve 51 connected to a left rear wheel outlet valve 59 arranged at one end thereof, the left rear wheel inlet valve 51 is connected to a right front wheel inlet valve 52 arranged at one end thereof, the right front wheel inlet valve 52 is connected to a right front wheel outlet valve 58 arranged at one end thereof, the left rear wheel inlet valve 51 and the right front wheel inlet valve 52 are both connected to a two-chamber isolation valve module, and the left rear wheel outlet valve 59 and the right rear wheel outlet valve 57 are both connected to the second chamber 12 of the liquid storage pot of the external liquid storage pot 1.

[0046] The left rear wheel liquid inlet valve 51 and the right front wheel liquid inlet valve 52 are ABS liquid inlet valves, and the left rear wheel liquid outlet valve 59 and the right front wheel liquid outlet valve 58 are ABS liquid outlet valves.

[0047] The right front wheel liquid outlet valve 58 and the left rear wheel liquid outlet valve 59 are both connected to the second liquid storage chamber 12 of the external liquid storage pot 1; an RL oil outlet is provided between the left rear wheel liquid inlet valve 51 and the left rear wheel liquid outlet valve 59, and an FR oil outlet is provided between the right front wheel liquid inlet valve 52 and the right front wheel liquid outlet valve 58.

[0048] By stepping on the pedal simulator, the master cylinder input push rod is pushed forward. At this time, the master cylinder chamber isolation valve 44 is closed, the pressure building unit chamber isolation valve 50 is opened, and the pedal simulator isolation valve 42 is opened. The remaining solenoid valves remain unchanged in their original state. Through the signal transmission of the vehicle wiring harness, the ECU electronic control unit 60 of the external pressure building unit assembly 4 detects the displacement of the brake master cylinder push rod and controls the pressure building unit 46 to build brake pressure. Under the action of the brake master cylinder PC, the brake fluid flows into the RL oil outlet and the FR oil outlet respectively to perform braking. At the same time, the pressure built up in the master cylinder chamber enters the pedal simulator assembly 43 through the pedal simulator isolation valve 42, and the corresponding pedal feel is fed back to the driver. When the driver releases the pedal, the brake fluid returns along the original path according to the brake fluid flow direction in the pressure building state.

[0049] A one-way valve assembly 47 is provided between the second chamber 12 of the liquid storage pot and the pressure building unit 46 as a liquid replenishing channel to prevent oil backflow.

[0050] The pressure building unit 46 is also provided with a motor position sensor 45 to monitor the motor rotation angle and calculate the pressure building unit stroke. The pressure building unit pressure sensor 53 monitors the pressure signal in the pressure building unit 46, and detects the pressure on the pressure building unit 46 in real time, and timely applies and reduces pressure, which can not only maintain normal operation but also extend the service life.

[0051] The system is also provided with an ECU electronic control unit 60 as a power source and software carrier to control the motor, pressure sensor, and solenoid valve.

[0052] Working principle:

[0053] 1. Normal work:

[0054] (1) Fill the brake fluid into the split master cylinder assembly 2 and the external pressure building unit assembly 4 through the external fluid reservoir 1, and exhaust the air in the system (manual exhaust or vacuum filling can be used);

[0055] (2) System power-on;

[0056] (3) Press the brake pedal to push the master cylinder input push rod forward. At this time, the isolation valves of the first and second chambers of the master cylinder are closed, the isolation valves of the first and second chambers of the pressure building unit are opened, and the pedal simulator isolation valve 42 is opened. The remaining solenoid valves remain unchanged in their original state. Through the signal transmission of the vehicle wiring harness, the ECU of the external pressure building unit detects the displacement of the brake master cylinder push rod, controls the pressure building unit to build up the brake pressure, and outputs it to the corresponding wheel end of the vehicle for braking. At the same time, the pressure built up in the first chamber of the master cylinder enters the pedal simulator assembly 43 through the pedal simulator isolation valve 42, and feeds back the corresponding pedal feel to the driver.

[0057] (4) The driver releases the brake pedal and the brake fluid returns along the same path as when the pressure was built up.

[0058] 2. Failure backup

[0059] After the system fails, all solenoid valves remain installed, the driver steps on the brake pedal, builds up brake pressure, and outputs it to the four wheels of the vehicle to perform braking work.

[0060] Structural installation method:

[0061] (1) The external fluid reservoir 1 is installed at the location specified by the customer and connected to the split master cylinder assembly 2 and the external pressure building unit assembly 4 through the brake hose 13;

[0062] (2) The split master cylinder assembly 2 is installed on the vehicle firewall and connected to the brake pedal. It is connected to the external pressure building unit assembly 4 through the brake hard pipe 3, wherein the oil outlet of the brake master cylinder SC cavity is connected to the oil inlet of the brake master cylinder SC cavity used by the external pressure building unit assembly 4, and the oil outlet of the brake master cylinder PC cavity is connected to the oil inlet of the brake master cylinder PC cavity used by the external pressure building unit;

[0063] (3) The external pressure building unit assembly 4 is fixed to the customer-specified position on the vehicle through the bracket on the valve body, and the FL, RR, FR, and RL oil outlets on it are connected to the four corresponding wheels of the vehicle.

[0064] Therefore, the utility model adopts the above-mentioned decoupled wire control brake system and designs a split structure, which can be suitable for vehicles with small installation space on the vehicle end, solves the layout problem of EHB products on the vehicle end, and has a lower noise level.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. A decoupled wire-controlled brake system, comprising an external fluid reservoir, a split master cylinder assembly, a brake pipe, and an external pressure-building unit assembly, characterized in that: The fluid storage pot is connected to the external pressure building unit assembly through a brake hose; The split master cylinder assembly includes a brake master cylinder, a pedal displacement sensor and a pedal interface; The brake master cylinder includes a brake master cylinder SC and a brake master cylinder PC; A pressure building unit is provided at one end of the brake master cylinder SC, and a master cylinder two-chamber pressure sensor and a two-chamber isolation valve module are sequentially provided between the brake master cylinder SC and the pressure building unit, and the two-chamber isolation valve module is connected to the second wheel oil outlet module; One end of the master brake cylinder PC is connected to a pressure building unit, and a chamber isolation valve module is sequentially arranged between the master brake cylinder PC and the pressure building unit, and the chamber isolation valve module is connected to a first wheel oil outlet module.

2. A decoupled wire control brake system according to claim 1, characterized in that: The one-chamber isolation valve module includes a master cylinder one-chamber isolation valve and a pressure building unit one-chamber isolation valve, and the brake master cylinder PC, the master cylinder one-chamber isolation valve, the pressure building unit one-chamber isolation valve, and the pressure building unit are connected in sequence; The two-chamber isolation valve module includes a master cylinder two-chamber isolation valve and a pressure building unit two-chamber isolation valve. The brake master cylinder SC, the master cylinder two-chamber pressure sensor, the master cylinder two-chamber isolation valve, the pressure building unit two-chamber isolation valve, and the pressure building unit are connected in sequence.

3. A decoupled brake-by-wire system according to claim 2, characterized in that: The first wheel oil outlet module includes a left rear wheel liquid inlet valve connected to a left rear wheel liquid outlet valve arranged at one end thereof, the left rear wheel liquid inlet valve is connected to a right front wheel liquid inlet valve arranged at one end thereof, the right front wheel liquid inlet valve is connected to a right front wheel liquid outlet valve arranged at one end thereof, the left rear wheel liquid inlet valve and the right front wheel liquid inlet valve are both connected to a two-chamber isolation valve module, and the left rear wheel liquid outlet valve and the right rear wheel liquid outlet valve are both connected to an external liquid storage pot.

4. The decoupled brake-by-wire system according to claim 2, characterized in that: The second wheel oil outlet module includes a left front wheel liquid inlet valve connected to a left front wheel liquid outlet valve arranged at one end thereof, the left front wheel liquid inlet valve is connected to a right rear wheel liquid inlet valve arranged at one end thereof, the right rear wheel liquid inlet valve is connected to a right rear wheel liquid outlet valve arranged at one end thereof, the left front wheel liquid inlet valve and the right rear wheel liquid inlet valve are both connected to a chamber isolation valve module, and the right rear wheel liquid inlet valve and the right rear wheel liquid outlet valve are both connected to an external liquid storage pot.

5. The decoupled brake-by-wire system according to claim 3, characterized in that: The right front wheel liquid outlet valve and the left rear wheel liquid outlet valve are both connected to an external liquid storage pot; an RL oil outlet is provided between the left rear wheel liquid inlet valve and the left rear wheel liquid outlet valve, and an FR oil outlet is provided between the right front wheel liquid inlet valve and the right front wheel liquid outlet valve.

6. The decoupled brake-by-wire system according to claim 4, characterized in that: The left front wheel liquid outlet valve and the right rear wheel liquid outlet valve are both connected to an external liquid storage pot, an FL oil outlet is arranged between the left front wheel liquid inlet valve and the left front wheel liquid outlet valve, and an RR oil outlet is arranged between the right rear wheel liquid inlet valve and the right rear wheel liquid outlet valve.

7. The decoupled brake-by-wire system according to claim 1, characterized in that: The external liquid storage pot is connected to the pressure building unit, and a pedal simulator module is also arranged between the external liquid storage pot and the pressure building unit. The pedal simulator module is also connected to the brake master cylinder PC and the master cylinder chamber isolation valve. The pedal simulator module includes a pedal simulator isolation valve and a pedal simulator assembly.

8. The decoupled brake-by-wire system according to claim 1, characterized in that: The external liquid storage pot has a two-chamber structure, including a first liquid storage pot chamber and a second liquid storage pot chamber. The first liquid storage pot chamber is connected to the pedal interface through a brake hose.

9. The decoupled brake-by-wire system according to claim 8, characterized in that: A one-way valve assembly is arranged between the second chamber of the liquid storage pot and the pressure building unit.

10. The decoupled brake-by-wire system according to claim 1, characterized in that: The pressure building unit is also provided with a motor position sensor and a pressure building unit pressure sensor.

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