Vehicle-integrated braking system

Abstract

Vehicle-integrated braking system, comprising: an EBS (electric braking system) configured to generate a braking force of a master brake by causing compressed air supplied from an air reservoir (10) to be introduced into or discharged from a master brake chamber (50) by selectively actuating a plurality of EBS valves in response to an actuation signal from a brake pedal (BP); an EPB (electronic parking brake) valve (60) configured to receive the compressed air supplied from the air reservoir (10) and to allow or block the compressed air by being selectively actuated in response to an actuation signal from a parking brake (PB); a parking brake chamber (70) configured to generate a parking brake (PB) braking force when compressed air is introduced into or discharged from the EPB valve (60); an outlet opening (80) configured to release the compressed air discharged from the master brake chamber (50) and the compressed air discharged from the parking brake chamber (70); and a check valve (90) provided in an air line in which the majority of EBS valves, the EPB valve (60) and the outlet opening (80) meet, and which is configured such that it allows only a flow of the compressed air discharged from the majority of EBS valves to the outlet opening (80) and a flow of the compressed air discharged from the EPB valve (60) to the outlet opening (80).

Description

[0001] The invention relates to a vehicle-integrated braking system in which an electric braking system (EBS) and an electronic parking brake (EPB) system are integrated to simplify a brake control system and reduce costs.

[0002] An electronic parking brake (EPB) system electromagnetically operates a parking brake. The actuation of an EPB valve is controlled by a parking brake actuation signal transmitted by an EPB control unit to generate braking force in the parking brake or release braking force from the parking brake.

[0003] An electric braking system (EBS) implements functions such as ABS and ASR. The actuation of an EBS valve is controlled by a brake pedal actuation signal transmitted by an EBS control unit to control the brake pressure of a brake cylinder.

[0004] In other words, EBS and EPB are very similar in terms of brake control; however, within a pneumatic braking system, EBS and EPB are operated separately. The valves and control units are configured independently. Consequently, there is a disadvantage in terms of material costs and the number of work steps.

[0005] Furthermore, a braking system for a commercial vehicle is known from DE 3146366 A1, which has a service brake compressed air reservoir and a spring accumulator compressed air reservoir, both of which are connected by a check valve, and a system that enables a vehicle to be parked safely even in the event of a total failure of an electrical power supply is known from DE 10 2005 058 799 A1.

[0006] The invention creates a vehicle-integrated braking system in which an EBS and an EPB system are integrated to simplify a brake control system and reduce costs.

[0007] The present invention provides a vehicle-integrated braking system according to claim 1. Advantageous embodiments are described in the dependent claims.

[0008] According to the invention, a vehicle-integrated braking system includes an EBS (electric braking system) configured to generate a master brake force by selectively actuating a plurality of EBS valves in response to a brake pedal actuation signal, causing compressed air supplied from an air reservoir to be introduced into or discharged from a master brake chamber. The vehicle-integrated braking system also includes an EPB (electronic parking brake) valve configured to receive the compressed air supplied from the air reservoir and selectively allow or block the compressed air to pass through in response to a parking brake actuation signal.The vehicle-integrated braking system has a parking brake chamber configured to generate a parking brake force when compressed air is introduced into or discharged from the EPB valve. The vehicle-integrated braking system has an exhaust port configured to release compressed air discharged from the master brake chamber and compressed air discharged from the parking brake chamber. The vehicle-integrated braking system has a check valve located in an air line where the EBS valves, the EPB valve, and the exhaust port converge. The check valve (or the air line) is configured to allow only the flow of compressed air discharged from the EBS valves to the exhaust port and the flow of compressed air discharged from the EPB valve to the exhaust port.

[0009] The vehicle-integrated braking system may further include a control unit configured to receive the actuation signal of the brake pedal and the actuation signal of the parking brake in order to control the switching on / off of the EBS valves and the EPB valve.

[0010] The EBS valves can include a first EBS valve connected to the air reservoir and configured to be switched on / off; a second EBS valve connected to the first EBS valve and the check valve, also configured to be switched on / off; and a relay valve connected to the air reservoir, the first EBS valve, the second EBS valve, the master brake chamber, and the check valve, configured to be actuated by switching on the first EBS valve. The EPB valve can be connected to the air reservoir, the parking brake chamber, and the check valve. The check valve can be connected to the relay valve, the EPB valve, the second EBS valve, and the outlet.

[0011] The first EBS valve can be a two-way, two-position solenoid valve with a first port connected to the air reservoir and a second port connected to the relay valve. The second EBS valve can also be a two-way, two-position solenoid valve with a first port connected to the relay valve and a second port connected to the check valve. The relay valve can have a first port connected to the air reservoir, a second port connected to the second port of the first EBS valve and the first port of the second EBS valve, a third port connected to an inlet / outlet port of the master brake chamber, and a fourth port connected to the check valve.The EPB valve can be a three-way, two-position solenoid valve with a first opening connected to the air reservoir, a second opening connected to an inlet / outlet port of the parking brake chamber, and a third opening connected to the check valve. The check valve can have a first inlet port connected to the second port of the second EBS valve, a second inlet port connected to the fourth port of the relay valve, a third inlet port connected to the third port of the EPB valve, and an outlet port connected to the exhaust port.

[0012] The vehicle-integrated braking system may further comprise a main air supply line which is connected at one end to the air reservoir, branches in a middle section, and is connected at the remaining end to each of the first openings of the first EBS valve, the first opening of the relay valve, and the first opening of the EPB valve. The vehicle-integrated braking system may further comprise a first EBS air line which is connected at one end to the second opening of the first EBS valve, branches in a middle section, and is connected at the remaining end to each of the first openings of the second EBS valve and the second opening of the relay valve.The vehicle-integrated braking system may further comprise a second EBS air line, one end of which is connected to the third port of the relay valve and the other end to the inlet / outlet port of the master brake chamber. The vehicle-integrated braking system may further comprise a third EBS air line, one end of which is connected to the second port of the second EBS valve and the other end to the first inlet port of the check valve. The vehicle-integrated braking system may further comprise a first EPB air line, one end of which is connected to the second port of the EPB valve and the other end to the inlet / outlet port of the parking brake chamber.The vehicle-integrated braking system may further comprise a second EPB air line, which is connected at one end to the third orifice of the EPB valve and at the other end to the third inlet (or the second inlet) of the check valve. The vehicle-integrated braking system may further comprise an outlet air line, which is connected at one end to the outlet of the check valve and at the other end to the outlet.

[0013] The vehicle-integrated braking system may also include a safety EBS valve, which is connected between a brake cylinder connected to the brake pedal and the relay valve in such a way that it can be switched on / off.

[0014] The vehicle-integrated braking system may also include a pressure sensor connected to the third opening of the relay valve.

[0015] Through the configuration described above, the invention combines an EBS function with an EPB function by adding an EPB valve to the EBS valve system. Therefore, the actuation of the EBS valves and the actuation of the EPB valve can be controlled by a single integrated control unit, and a separate pneumatic line connecting the EPB is eliminated to optimize the pneumatic path. Accordingly, it is possible to simplify the control unit and reduce costs.

[0016] The invention is explained in more detail with reference to the drawing. The drawing shows: Fig. 1 a pneumatic circuit diagram of an integrated braking system according to an embodiment of the invention; Fig. 2 an enlarged view of part of the pneumatic circuit Fig. 1; and Fig. 3 a view to illustrate a state in which an EPB valve is actuated according to an embodiment of the invention.

[0017] The following section describes embodiments of the invention in detail with reference to the drawing.

[0018] A vehicle-integrated braking system according to the invention has a structure in which an EPB (electronic parking brake) system is added to an EBS (electric braking system) to control a main brake and a parking brake PB together in a single braking system. The vehicle-integrated braking system generally comprises the EBS, an EPB valve 60, a parking brake chamber 70, an outlet port 80, and a check valve 90.

[0019] With reference to Fig. Section 1 describes the invention in detail. First, a plurality of EBS valves in the EBS are selectively actuated according to an actuation signal from a brake pedal BP. This allows compressed air, supplied from an air reservoir 10, to be introduced into or discharged from a master brake chamber 50 to generate the braking force of the master brake.

[0020] For example, the main brake chamber 50 is provided with a main actuating rod 52, which is actuated in such a way that it is linearly displaced by compressed air, and a return spring 53, which exerts a spring-like return force on the main actuating rod 52.

[0021] When the brake pedal BP is depressed and compressed air flows into the master brake chamber 50, the master brake is applied while the master actuating rod 52 is moved. When the foot is released from the brake pedal BP and compressed air is discharged from the master brake chamber 50, the master actuating rod 52 is reset and moved by the spring-like return force of the return spring 53, thereby releasing the application of the master brake.

[0022] Furthermore, the EPB valve 60 is supplied with compressed air from the air reservoir 10 and is selectively actuated in response to an actuation signal from the parking brake PB, whereby the compressed air passes through or is blocked.

[0023] Compressed air is introduced into or discharged from the parking brake chamber 70 via the EPB valve 60 to generate the braking force of the parking brake.

[0024] For example, the parking brake chamber 70 can be attached to one side of the master brake chamber 50 and equipped with a parking actuating rod 72. The parking actuating rod 72 is actuated by being linearly displaced by the compressed air. A return spring 73 is configured to exert a spring-like return force on the parking actuating rod 72.

[0025] During the resetting process of the return spring 73, the parking actuating rod 72 pushes the main actuating rod 52, so that the brake can be actuated by the main actuating rod 52.

[0026] This means that when the parking brake PB is operated in such a way that it is released, compressed air is introduced into the parking brake chamber 70. This causes the parking actuating rod 72 to be moved linearly away from the main actuating rod 52, thereby releasing the parking brake PB.

[0027] In contrast, when the parking brake PB is operated in such a way that it is actuated, the compressed air is discharged into the parking brake chamber 70. This causes the parking actuating rod 72 to be moved in a straight line by the spring-like restoring force of the return spring 73 in the direction of the main actuating rod 52, thereby pushing the main actuating rod 52 in the actuating direction to actuate the parking brake PB.

[0028] Furthermore, the outlet opening 80 releases the compressed air discharged from the main brake chamber 50 and the compressed air discharged from the parking brake chamber 70.

[0029] The check valve 90 is provided in the air line where the EBS valves and the EPB valve 60 are connected to the outlet opening 80, in order to allow only the flow of the compressed air discharged from the EBS valves to the outlet opening 80 and the flow of the compressed air discharged from the EPB valve 60 to the outlet opening 80.

[0030] Furthermore, the invention can also include a control device CLR which receives an actuation signal from the brake pedal BP and an actuation signal from the parking brake PB in order to control the switching on / off of the EBS valves and the EPB valve 60.

[0031] By adding the EPB valve 60 to the EBS valve system to integrate the EBS and EPB functions, the actuation of the EBS valves and the EPB valve 60 are controlled by a single integrated control unit, CLR. Accordingly, it is possible to simplify the control unit and eliminate a separate pneumatic line connecting the EPB, thereby optimizing the pneumatic path.

[0032] With reference to Fig. Section 1 describes the valves controlled by the CLR control unit and the connection relationship between the valves. The EBS valves initially comprise a first EBS valve 20, a second EBS valve 30, and a relay valve 40.

[0033] For example, the first EBS valve 20 is connected to the air reservoir 10 and configured to be switched on / off. The second EBS valve 30 is connected to the first EBS valve 20 and the check valve 90 and configured to be switched on / off. The relay valve 40 is connected to the air reservoir 10, the first EBS valve 20, the second EBS valve 30, the master brake chamber 50, and the check valve 90, and configured to be actuated in response to the activation of the first EBS valve 20.

[0034] The EPB valve 60 is connected to the air reservoir 10, the parking brake chamber 70 and the check valve 90.

[0035] The check valve 90 is connected to the relay valve 40, the EPB valve 60, the second EBS valve 30 and the outlet opening 80.

[0036] With regard to the Fig. 1 and Fig. 2. The connection structures of these valves are described in detail. First, the first EBS valve 20 is a two-way, two-position solenoid valve, in which a first opening 21 is connected to the air reservoir 10 and a second opening 22 is connected to the relay valve 40.

[0037] The second EBS valve 30 is a two-way, two-position solenoid valve, in which a first opening 31 is connected to the relay valve 40 and a second opening 32 is connected to the check valve 90.

[0038] The relay valve 40 has a first opening 41 which is connected to the air reservoir 10, a second opening 42 which is connected to the second opening 22 of the first EBS valve 20 and the first opening 31 of the second EBS valve 30, a third opening 43 which is connected to an inlet / outlet opening 51 of the master brake chamber 50, and a fourth opening 44 which is connected to the check valve 90.

[0039] The EPB valve 60 is a three-way two-position solenoid valve in which a first opening 61 is connected to the air reservoir 10, a second opening 62 is connected to an inlet / outlet opening 71 of the parking brake chamber 70, and a third opening 63 is connected to the check valve 90.

[0040] The check valve 90 has a first inlet opening 91 which is connected to the second opening 32 of the second EBS valve 30, a second inlet opening 92 which is connected to the fourth opening 44 of the relay valve 40, a third inlet opening 93 which is connected to the third opening 63 of the EPB valve 60, and an outlet opening 94 which is connected to the outlet opening 80.

[0041] Furthermore, according to the invention, the openings formed in the valves can be connected to each other via air lines.

[0042] With reference to the drawing, a main air supply line L1 is first connected at one end to the air reservoir 10, branched at a middle section of it and connected at the other end to each of the first opening 21 of the first EBS valve 20, the first opening 41 of the relay valve 40 and the first opening 61 of the EPB valve 60.

[0043] A first EBS air line L2 is connected at one end to the second opening 22 of the first EBS valve 20, branches off at a middle section of it and is connected at the other end to each of the first opening 31 of the second EBS valve 30 and the second opening 42 of the relay valve 40.

[0044] A second EBS air line L3 is connected at one end to the third opening 43 of the relay valve 40 and at the other end to the inlet / outlet opening 51 of the main brake chamber 50.

[0045] A third EBS air line L4 is connected at one end to the second opening 32 of the second EBS valve 30 and at the other end to the first inlet opening 91 of the check valve 90.

[0046] A first EPB air line L5 is connected at one end to the second opening 62 of the EPB valve 60 and at the other end to the inlet / outlet opening 71 of the parking brake chamber 70.

[0047] A second EPB air line L6 is connected at one end to the third opening 63 of the EPB valve 60 and at the other end to the third inlet opening 93 of the check valve 90.

[0048] An outlet air line L7 is connected at one end to the outlet opening 94 of the check valve 90 and at the other end to the outlet opening 80.

[0049] According to such a configuration, when the driver presses the brake pedal BP, a brake-ON signal is sent to the control unit CLR. When the first EBS valve 20 is opened and the second EBS valve 30 is closed, the compressed air in the air reservoir 10 passes through the first EBS valve 20 and is directed to the second opening 42 of the relay valve 40, thereby actuating the piston of the relay valve 40.

[0050] The compressed air in the air reservoir 10 passes through the first opening 41 of the relay valve 40, through the third opening 43 of the relay valve 40, and flows through the second EBS air line L3 into the main brake chamber 50, thereby actuating the main brake.

[0051] In contrast, when the driver releases their foot from the brake pedal BP, a brake-OFF signal is sent to the control unit CLR. The first EBS valve 20 is deactivated, and the second EBS valve 30 is activated. The compressed air introduced into the master brake chamber 50 is discharged and introduced into the third port 43 of the relay valve 40. The compressed air introduced into the third port 43 of the relay valve 40 is discharged through the fourth port 44 of the relay valve 40 and released to the outlet port 80.

[0052] Furthermore, the compressed air used to actuate the relay valve 40 is introduced via the second EBS valve 30 into the first inlet opening 91 of the check valve 90. The introduced compressed air is released via the outlet opening 94 of the check valve 90 and the outlet opening 80.

[0053] Meanwhile, as in Fig. As shown in Figure 1, the first opening 61 of the EPB valve 60 is blocked during the parking mode of the parking brake PB, preventing the compressed air in the air reservoir 10 from passing through the EPB valve 60. The second opening 62 of the EPB valve 60 is connected to the parking brake chamber 70. The third opening 63 of the EPB valve 60 is connected to the third inlet opening 93 of the check valve 90. This prevents the compressed air from flowing back from the second EBS valve 30 to the EPB valve 60. Consequently, the inside of the parking brake chamber 70 is maintained at atmospheric pressure, and the compressed air is expelled. The parking brake PB can be actuated by the spring-like return force of the return spring 73, which is provided in the parking brake chamber 70.

[0054] In contrast, when the parking brake (PB) is released, as in Fig. Figure 3 shows the EPB valve 60 being switched on by the CLR control unit.

[0055] The compressed air in the air reservoir 10 flows through the first opening 61 of the EPB valve 60 and the second opening 62 of the EPB valve 60 into the parking brake chamber 70, thereby compressing the return spring 73 in the parking brake chamber 70, which causes the actuation of the parking brake PB to be released.

[0056] When the master brake is applied by pressing the brake pedal BP at this time, the compressed air in the master brake chamber 50 is released through the outlet port 80 in response to the actuation of the first EBS valve 20 and the second EBS valve 30 when the master brake is released. The third inlet port 93 of the check valve 90 prevents the compressed air from flowing back towards the EPB valve 60, thus preventing the compressed air that actuated the master brake from flowing into the EPB valve 60.

[0057] This means that under the activation signal OFF condition of the EPB valve 60, the opening connected to the parking brake chamber 70 is connected to the atmosphere, and the opening connected to the air reservoir 10 is blocked, thereby bringing the parking brake PB into the state in which the parking brake PB is actuated.

[0058] In contrast, under the actuation signal ON condition of the EPB valve 60, the compressed air of the air reservoir 10 is directed via the EPB valve 60 to the parking brake chamber 70, and the opening of the EPB valve 60 connected to the check valve 90 is blocked, thereby bringing the parking brake PB into the state in which the actuation of the parking brake PB is released.

[0059] The invention can further include a safety EBS valve 20' which is connected between the brake cylinder connected to the brake pedal BP and the relay valve 40 in such a way that it can be switched on / off.

[0060] For example, if the driver presses the brake pedal BP, but the electrical signal from the control unit CLR fails, compressed air is routed via the brake cylinder to the safety EBS valve 20'. The relay valve 40 can thus be actuated by the compressed air supplied by the safety EBS valve 20'.

[0061] However, when the electrical signal from the CLR control unit is normal, compressed air is directed to the safety EBS valve 20', and simultaneously the safety EBS valve 20' is actuated in such a way that it blocks the compressed air directed to the safety EBS valve 20'. The main brake is actuated by the actuation of the first EBS valve 20 and the second EBS valve 30, as described above. This configuration allows for a rapid braking response and pressure control through the electrical control of the first EBS valve 20 and the second EBS valve 30.

[0062] Furthermore, according to the invention, a pressure sensor PS can be connected to the third opening 43 of the relay valve 40.

[0063] The pressure of the main brake chamber 50 can be adjusted to an optimal pressure according to the deceleration of the vehicle by the first EBS valve 20, the second EBS valve 30 and the relay valve 40 together with the pressure sensor PS.

[0064] As described above, the invention combines an EBS function with an EPB function by adding an EPB valve 60 to the EBS valve system. Therefore, the actuation of the EBS valves and the actuation of the EPB valve 60 can be controlled by a single integrated control unit CLR. A separate pneumatic line connecting the EPB is eliminated in order to optimize the pneumatic path. Therefore, the control unit can be simplified, and costs can be reduced.

Claims

[1] Vehicle-integrated braking system comprising: an EBS (electric braking system) configured to generate a braking force of a master brake by causing compressed air supplied from an air reservoir (10) to be introduced into or discharged from a master brake chamber (50) by selectively actuating a plurality of EBS valves in response to an actuation signal from a brake pedal (BP); an EPB (electronic parking brake) valve (60) configured to receive the compressed air supplied from the air reservoir (10) and to allow or block the compressed air by being selectively actuated in response to an actuation signal from a parking brake (PB); a parking brake chamber (70) configured to generate a parking brake (PB) braking force when compressed air is introduced into or discharged from the EPB valve (60); an outlet opening (80) configured to release the compressed air discharged from the master brake chamber (50) and the compressed air discharged from the parking brake chamber (70); and a check valve (90) provided in an air line in which the majority of EBS valves, the EPB valve (60) and the outlet opening (80) meet, and which is configured such that it allows only a flow of the compressed air discharged from the majority of EBS valves to the outlet opening (80) and a flow of the compressed air discharged from the EPB valve (60) to the outlet opening (80). [2] Vehicle-integrated braking system according to claim 1, further comprising: a control unit (CLR) configured to receive the brake pedal actuation signal (BP) and the parking brake actuation signal (PB) to control the switching on / off of the majority of EBS valves and the EPB valve (60). [3] Vehicle-integrated braking system according to claim 1 or 2, wherein the plurality of EBS valves comprises: a first EBS valve (20) which is connected to the air reservoir (10) and is configured to be switched on / off; a second EBS valve (30) connected to the first EBS valve (20) and the check valve (90) and configured to be switchable on / off; and a relay valve (40) which is connected to the air reservoir (10), the first EBS valve (20), the second EBS valve (30), the master brake chamber (50) and the check valve (90) and is configured to be actuated by switching on the first EBS valve (20), wherein the EPB valve (60) is connected to the air reservoir (10), the parking brake chamber (70) and the check valve (90), and wherein the check valve (90) is connected to the relay valve (40), the EPB valve (60), the second EBS valve (30) and the outlet opening (80). [4] Vehicle-integrated braking system according to claim 3, wherein the first EBS valve (20) is a two-way two-position solenoid valve having a first opening (21) connected to the air reservoir (10) and a second opening (22) connected to the relay valve (40), wherein the second EBS valve (30) is a two-way two-position solenoid valve having a first opening (31) connected to the relay valve (40) and a second opening (32) connected to the check valve (90), wherein the relay valve (40) has a first opening (41) connected to the air reservoir (10), a second opening (42) connected to the second opening (22) of the first EBS valve (20) and the first opening (31) of the second EBS valve (30), a third opening (43) connected to an inlet / outlet opening (51) of the master brake chamber (50), and a fourth opening (44) connected to the check valve (90), wherein the EPB valve (60) is a three-way two-position solenoid valve having a first opening (61) connected to the air reservoir (10), a second opening (62) connected to an inlet / outlet opening (71) of the parking brake chamber (70), and a third opening (63) connected to the check valve (90), and wherein the check valve (90) has a first inlet port (91) connected to the second port (32) of the second EBS valve (30), a second inlet port (92) connected to the fourth port (44) of the relay valve (40), a third inlet port (93) connected to the third port (63) of the EPB valve (60), and an outlet port (94) connected to the outlet port (80). [5] Vehicle-integrated braking system according to claim 4, further comprising: a main air supply line (L1) which is connected at one end to the air reservoir (10), is branched in a middle section of it and is connected at the remaining end of it to each of the first opening (21) of the first EBS valve (20), the first opening (41) of the relay valve (40) and the first opening (61) of the EPB valve (60); a first EBS air line (L2) which is connected at one end to the second opening (22) of the first EBS valve (20), is branched in a middle section of it and is connected at the remaining end to each of the first opening (31) of the second EBS valve (30) and the second opening (42) of the relay valve (40); a second EBS air line (L3) which is connected at one end to the third opening (43) of the relay valve (40) and at the other end to the inlet / outlet opening (51) of the main brake chamber (50); a third EBS air line (L4) which is connected at one end to the second opening (32) of the second EBS valve (30) and at the other end to the first inlet opening (91) of the check valve (90); a first EPB air line (L5) which is connected at one end to the second opening (62) of the EPB valve (60) and at the other end to the inlet / outlet opening (71) of the parking brake chamber (70); a second EPB air line (L6) which is connected at one end to the third opening (63) of the EPB valve (60) and at the other end to the third inlet opening (93) of the check valve (90); and an outlet air line (L7) which is connected at one end to the outlet opening (94) of the check valve (90) and at the other end to the outlet opening (80). [6] Vehicle-integrated braking system according to one of claims 3 to 5, further comprising: a safety EBS valve (20') which is connected between a brake cylinder connected to the brake pedal (BP) and the relay valve (40) in such a way that it can be switched on / off. [7] Vehicle-integrated braking system according to claim 4 or 5, further comprising: a pressure sensor (PS) connected to the third opening (43) of the relay valve (40).

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