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CN-122003346-A - Bistable relay valve

CN122003346ACN 122003346 ACN122003346 ACN 122003346ACN-122003346-A

Abstract

The invention relates to a bistable relay valve for an electro-pneumatic brake control device (1), comprising a relay piston (46) which can be in a first end position, a second end position and a plurality of intermediate positions between the first end position and the second end position, a control chamber (42) delimited by the relay piston (46), a pneumatic control input (20) which is always connected to the control chamber (42) for feeding control pressure from a control pressure generator (8) to the control chamber (20) for actuating the relay piston (46), an output port (28) for outputting an operating pressure, at least one supply port (16) for controlling the supply pressure, an exhaust port (56), a double seat valve comprising an inlet valve (74) and an outlet valve (78) and actuated by the relay piston (46), a working chamber (58) connected to the output port (28), and a supply chamber (60) connected to the at least one supply port (16). Wherein in a first end position of the relay piston (46), the working chamber (58) is connected to the exhaust port (56), and in a second end position, the working chamber (58) is connected to the supply chamber (60). When the relay piston (46) reaches a first end position, a first flow path connection is formed through which the control chamber (42) is connected to the exhaust port (56), and when the relay piston (46) reaches a second end position, a second flow path connection is formed through which at least one supply port (16) is connected to the control chamber (42). The design enables the end position of the relay valve (18) to remain stable.

Inventors

  • F Zeman

Assignees

  • 克诺尔商用车制动系统有限公司

Dates

Publication Date
20260508
Application Date
20240917
Priority Date
20231012

Claims (15)

  1. 1. A bistable relay valve (18) for an electro-pneumatic brake control device (1), comprising: a) A relay valve body (44); b) A relay piston (46) guided within the relay valve body (44) and capable of being in a first end position, a second end position, and a plurality of intermediate positions between the first end position and the second end position; c) A control chamber (42) defined by a relay piston (46); d) A pneumatic control input (20) which is always connected to the control chamber (42) for feeding control pressure from the control pressure generator (8) into the control chamber (20) for actuating the relay piston (46); e) An output port (28) for controlling the operating pressure; f) At least one supply port (16) designed and arranged to be able to control the supply pressure of at least one compressed air supply source; g) An exhaust port (56) which is always in communication with the atmosphere (24); h) A double seat valve comprising an inlet valve (74) and an outlet valve (78) and actuated by the relay piston (46), and I) A working chamber (58) connected to the output port (28); j) A supply chamber (60) connected to the at least one supply port (16), wherein, K1 In a first end position of the relay piston (46), the working chamber (58) is in communication with or remains in communication with the exhaust port (56), and K2 In a second end position of the relay piston (46), the working chamber (58) is in communication with or remains in communication with the supply chamber (60), I) When the relay piston (46) reaches the first end position, a first flow path connection is formed in which the control chamber (42) is connected or remains connected to the exhaust port (56), the first flow path connection being disconnected at least at the second end position of the relay piston (46), It is characterized in that the method comprises the steps of, M) when the relay piston (46) reaches the second end position, a second flow path connection is formed, in which the at least one supply port (16) is connected or remains connected to the control chamber (42), N) the second flow path connection is broken at least at the first end position.
  2. 2. The bi-stable relay valve of claim 1, wherein the inlet valve (74) and the outlet valve (78) are each closed in at least one particular intermediate position of a plurality of intermediate positions of the relay piston (46), A) A first flow path connection is formed and a second flow path connection is broken, or B) The second flow path connection being formed and the first flow path connection being broken, or C) The first flow path connection and the second flow path connection are both separate.
  3. 3. Bistable relay valve according to any one of the preceding claims, characterized in that the relay piston (46) defines a control chamber (42) on one side and a working chamber (58) on the other side.
  4. 4. Bistable relay valve according to any one of the preceding claims, characterized in that the relay piston (46) has a first active surface (80) and a second active surface (82) opposite the first active surface (80), the first active surface (80) facing the control chamber (42) and having a larger area than the second active surface (82) facing the working chamber (58).
  5. 5. The bistable relay valve according to any of the preceding claims, characterized in that the relay piston (46) is biased to the first end position by a first elastic member (64).
  6. 6. Bistable relay valve according to any of the preceding claims, characterized in that the relay piston (46) and the relay valve body (44) form part of a slide valve which is constructed and arranged to be able to form and/or disconnect a first flow path connection from a second flow path connection depending on the position of the relay piston (46).
  7. 7. The bistable relay valve according to claim 6, characterized in that the relay piston (46) comprises at least: a) A first through-opening (26) which is in constant communication with the control chamber (42) and which is connected in a first end position to an internal exhaust passage (66) connected to the exhaust port (56), and/or B) A second through hole (72) which is always in communication with the control chamber (42) on the one hand and which is connected in a second end position to a supply channel (30) connected to the at least one supply port (16).
  8. 8. Bistable relay valve according to any of the preceding claims, characterized in that, A) The inlet valve (74) of the double seat valve comprises an inlet seat (54) formed on the relay valve body (44) and a sleeve (52) cooperating with the inlet seat (54) and guided within the relay valve body (44), the sleeve (52) being biased against the inlet seat (54) by a second resilient member (62), and B) The outlet valve (78) of the double seat valve includes an outlet seat (50) formed on the sleeve (52) and a valve body (48) of the relay piston (46) that mates with the outlet seat (50).
  9. 9. An electro-pneumatic brake control device (1), characterized in that it comprises at least one bistable relay valve (18) according to any of the preceding claims, a control pressure generator (8) and at least one brake cylinder, the pneumatic control input (20) being connected to the control pressure generator (8), said at least one brake cylinder being connected directly or indirectly to the output port (28).
  10. 10. The electropneumatic brake control apparatus according to claim 9, characterized by comprising: a) The parking brake control device, wherein the working pressure is the parking brake pressure, and the at least one brake cylinder is a spring brake cylinder, or B) Service brake control device, wherein the working pressure is service brake pressure, and the at least one brake cylinder is service brake cylinder, or C) The trailer brake control device, wherein the working pressure is the trailer brake pressure.
  11. 11. An electro-pneumatic brake control as claimed in claim 9 or 10, characterized in that the control pressure generator (8) comprises a combination of in/out solenoid valves controlled by an electronic controller (14) to generate the control pressure.
  12. 12. The electro-pneumatic brake control device of claim 11, designed as a brake control module having at least integrated therein: a) -at least one integrated bistable relay valve (18) according to any one of claims 1 to 7; b) Electronic controller (14) C) And an in/out solenoid valve combination (8).
  13. 13. The electropneumatic brake control apparatus of claim 12, characterized in that the brake control module further comprises at least one integrated pressure sensor (88, 89), the electronic controller (14) being designed and arranged to be able to regulate the operating pressure output from the output port (28) of the bistable relay valve (18) and/or the control pressure input to the control input (20) of the bistable relay valve (18) detected by the at least one pressure sensor (88, 89) to a set pressure.
  14. 14. Vehicle brake device, characterized in that it comprises an electro-pneumatic brake control device (1) according to any one of claims 9 to 13 and at least one compressed air supply source, to which the at least one supply port (16) is connected.
  15. 15. The vehicle brake device according to claim 14, characterized in that the vehicle brake device: a) Comprising parking brake means, and/or B) Comprising service braking means, and/or C) Is or includes a trailer brake.

Description

Bistable relay valve Technical Field The present invention relates to a bistable relay valve for an electro-pneumatic brake control device according to the preamble of claim 1, and an electro-pneumatic brake control device having at least one bistable relay valve of the type according to claim 9, and also to a vehicle brake device having an electro-pneumatic brake control device of the type according to claim 14. Background In commercial vehicles comprising a towing trailer combination, the electro-pneumatic parking brake system is provided with a spring brake cylinder which in the released position pressurizes a spring compression chamber with compressed air, whereby the spring is kept in a tensioned state, and in braking the spring compression chamber is vented, i.e. connected to atmospheric pressure, such that the brake cylinder generates a braking force under the action of the spring. Electro-pneumatic parking brake devices are known having a pneumatic relay valve controlled by an electromechanical bistable solenoid valve. Both the "parking brake apply" and "parking brake release" valve positions must remain stable, i.e., in a selected end position without human intervention or electrical energy, which is particularly necessary in the event of electrical energy failure. In the prior art, therefore, the bistable characteristic is ensured by a bistable solenoid valve arranged downstream of the relay valve, as described in german patent DE102006055570B 4. However, bistable solenoid valves are costly and prone to failure in practical applications. In EP3678909B1, an arrangement is known in which the bistable characteristic is achieved by a feedback line from the output of the relay valve to the control chamber of the relay valve, in which feedback line a throttle is arranged. By the mode, the relay valve can achieve bistable operating characteristics, and the current parking or driving position can be stably maintained even if the electromagnetic valve device for controlling the relay valve loses power. However, the feedback pipeline needs to have a certain structural processing and occupies a mounting space, and the mounting space is particularly limited when the relay valve is applied to a pressure control module of a braking device. In contrast, the present invention aims to provide a bistable relay valve which is low in cost and occupies a small installation space. In addition, the invention also aims to provide an electro-pneumatic braking control device with the bistable relay valve and a vehicle braking device with the electro-pneumatic braking control device. The present invention solves the above-mentioned problems by the features of claims 1, 9 and 14. Disclosure of Invention The invention is based on a bistable relay valve for an electro-pneumatic brake control device, comprising: a) A relay valve body; b) A relay piston guided within the relay valve body and positionable in a first end position, a second end position, and a plurality of intermediate positions between the first end position and the second end position; c) A control chamber defined by the relay piston; d) A pneumatic control input, which is always connected to the control chamber, for feeding control pressure from, in particular, an external control pressure generator, to the control chamber for actuating the relay piston; e) An output port for controlling the working pressure; f) At least one supply port designed and arranged to control the supply pressure of at least one compressed air supply source; g) An exhaust port which is always in communication with the atmosphere; h) A double seat valve including an inlet valve and an outlet valve and actuated by a relay piston, and I) A working chamber, which is in particular always connected to the output port; j) A supply chamber, which is in particular always connected to at least one supply port, wherein, K1 In a first end position of the relay piston, in particular with the inlet valve closed and the outlet valve open, and the working chamber in communication with the exhaust port, and K2 In a second end position of the relay piston, in particular with the outlet valve closed and the inlet valve open, and with the working chamber in communication with the supply chamber or in communication therewith, L) when the relay piston reaches the first end position, a first flow connection is formed in which the control chamber is connected to the exhaust port, the first flow connection being disconnected at least at the second end position of the relay piston. By "flow path connection broken" is meant that the originally formed or in principle formable flow path connection is no longer present, or is interrupted, or is not formed. In particular, the relay piston is provided with a plurality of intermediate positions in order to be able to generate different required parking braking forces in an electro-pneumatic brake device, in particular in an electro-pneumatic parking brake device, for e