KR890701398A - Anti-lock / traction control brake operating system with pressure actuated disconnect valves - Google Patents

Abstract

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Description

Anti-lock / traction control brake system with pressure-operated disconnect valves

Since this is an open matter, no full text was included.

In the drawings, FIG. 1 is a schematic diagram showing a two-channel three solenoid anti-skid system optionally including traction control, FIG. 2 is a schematic diagram of an alternative system of a two-channel system, and FIG. 3 is one of the isolation valves of FIG. Detailed view showing.

Claims (20)

A control system for brake cylinders 62 of wheels 18 of a vehicle, comprising: first devices 22, 24, 26 for increasing brake fluid pressure in response to a driver's request and reservoirs for excess brake An apparatus 28 for storing fluid, a controller 40 responsive to signals indicative of the rotational state of each vehicle wheel 18 to generate control signals, and at least one control indicative of a stationary wheel A pump device 50 for supplying additional pressurized brake fluid in response to the signal and a brake pressure regulated with an output pressure substantially equal to that established by the first device in response to the output of the first device and the pump device. A device for establishing and comprising two operating modes responsive to the fluid pressure generated by the pump device 50, the first device being distributed to the brake cylinders 64. Separator 70 having a device effective during the first mode to separate the brake cylinders from the first device and a device valid during the second mode to provide an alternate flow path to and from the brake cylinders. And flow the device and brake cylinders to the storage device during the first operating mode to flow with the alternate flow path of the separator and to distribute the regulator to the separator and to increase the pressure of the brake cylinders. To a valve device 80 in response to a control signal generated by a control device indicative of a fixed wheel condition in circulation with a regulator device having a device operating during the second operating mode to reduce the brake pressure of the brake cylinder. Control system characterized in that . 2. The device of claim 1, wherein the first device comprises a master cylinder (22) comprising first and second chambers (25, 26), and the regulator device comprises first and second secondary arm adjusters (70a). 70b), wherein each chamber (24,26) is distributed to a corresponding pressure regulator (70a, 70b). 3. The control system according to claim 2, wherein said valve arrangement comprises first and second solenoid valves (80a, 80b; 150a, 150b) which are respectively distributed to respective pressure regulators and separators. 4. The solenoid valve (80a) of claim 3, wherein the first solenoid valve (80a) is switchable between a closed (non-flowing) state and an open (flowing) state and sets the first, second and third ports 82a, 84a, 86a. A first port 82a is distributed to the outlet of the first regulator and a second port 84a is distributed to the first port 92a in the alternative flow path of the separator. And the third pot 86a is distributed in the storage device 28, and the second solenoid valve 80b is switchable between the closed (non-flowing) state and the open (flowing) state, and the first and the second. And third ports 82b, 84b and 86b, the first port 82b being circulated at the outlet of the second regulator 72b, and the second port 84b of the separation device. Control system, characterized in that in an alternate flow path, the first port (92b) is distributed and the third port (86b) is also distributed to the storage (28). 5. The solenoid valve of claim 4, wherein each solenoid valve includes an orifice 88 between each of the second and third ports and, upon receiving a control signal, the solenoid valve passes such selected brake cylinders through such corresponding separation valves. Control system characterized in that it is distributed to the reservoir. 6. The separator according to claim 5, wherein the separator comprises first and second pressure sensitive separator valves (90a, 90b) distributed at the outlet of the corresponding one of the solenoid valves, each separator valve being in a master cylinder chamber. A control system comprising an inlet port (94a, 94b) distributed in one and an outlet port (96a, 96b) distributed in selected brake cylinders (64). 7. The brake cylinder according to claim 6, wherein each solenoid valve, if there is no control signal, distributes the outlet of its corresponding pressure regulator to the corresponding isolation valve so that when such a separation valve is in the second mode, the outlet of such pressure regulator is selected. Control circuit, wherein the solenoid valve distributes such selected brake cylinders to the reservoir via such a corresponding separation valve when distributed to the electric field and receives a control signal. 8. Control system according to claim 7, characterized in that several brake cylinders (62) circulated in each separation valve (90a, 90b) are arranged in selected cells. 9. The control system of claim 8, wherein such predetermined cells comprise brake cylinders corresponding to driven and non-driven wheels. 10. The control according to claim 9, wherein one of such brake cylinder cells comprises a rear wheel brake cylinder, and the proportional valve 110 is positioned between the rear wheel brake cylinder and the corresponding separation valve. system. 11. The control system of claim 10, wherein such predetermined cells of brake cylinders comprise a front wheel brake cylinder and a rear wheel brake cylinder positioned diagonally. 12. The solenoid valve (80a) of claim 11, wherein the first solenoid valve (80a) is switchable between a closed (non-flowing) state and an open (flowing) state and the first, second, and third ports (82a, 84a, 86a) A first port 82a is circulated at the outlet of the first regulator and a second port is circulated at the first port 92a in the alternate flow path of the separation device and The port is distributed in the storage device 28, and the second solenoid valve 80b is switchable between the closed (non-flowing) state and the open (flowing) state, and the first, second and third port ( 82b, 84b, 86b, wherein a first port 82b is circulated at the outlet of the second regulator 72b, and the second port is the first port of the separation device, in an alternate path. Control system, characterized in that the third port (86b) is distributed to the storage (28). 13. The control system of claim 12, wherein each solenoid valve includes an orifice (88) between its respective second and third ports. 14. The control system of claim 13, wherein the valve device includes a device for maintaining or retaining the brake pressure at the wheel cylinder of the sliding wheel at a level that can be determined. 15. The valve device of claim 14, wherein the valve device comprises third and fourth solenoid valves 152a, 152b, wherein the third and fourth solenoid valves 152a, 152b are closed (non-flowing) in response to a control signal. ) And a third solenoid valve 152a is connected to the reservoir and the first port connected at a point between the first solenoid valve 150a and the separator. And a fourth solenoid valve 152b includes a first port connected to the reservoir at a point between the second solenoid valve 150b and the separator, wherein the third solenoid valve 4 When either of the solenoid valves is in its open (flow) state, several of the brake cylinders are distributed to the reservoir 28 through a separator to reduce the level of brake pressure therein. The decay system characterized in that the decay. 16. The solenoid valve of claim 15, wherein the first and second solenoid valves 150a, 150b are switchable between closed (non-flowing) and open (flowing) states, wherein the first solenoid valve 150a is a third solenoid valve 152a. And a second port distributed to the outlet of the first pressure regulator 70a and the first port distributed to the first port of the second port, and the second solenoid valve 150b includes the fourth solenoid valve 152b. And a second port distributed to the outlet of the first port and the second pressure regulator (70b) distributed to the first port of the control unit. 17. The device of claim 16, wherein the separator (90) comprises a first pressure sensitive separation valve passed through the first and third solenoid valves and a second pressure sensitive separation valve passed through the second and fourth solenoid valves. And each separation valve is further circulated in the master cylinder chamber and in selected brake cylinders. 15. The system of claim 14, further comprising a pressure sensitive shuttle valve arrangement located upstream of the rear wheel brake cylinders, which is responsive to a traction control signal generated by the controller and for distributing the pump arrangement to the shuttle valve arrangement. A traction solenoid valve 120 having a second operating state for distributing the shuttle valve device to the storage device while the first operating state and the traction control signal are absent, the shuttle valve device being provided with first and second separation valves. Moveable to a first position for distributing them to its corresponding non-driven wheel brake cylinders respectively and to a second position in response to the pressure of the pumping device to prohibit build up of brake pressure on non-driven wheel brakes. A control system comprising a device. 19. The valve according to claim 18, wherein the check valves (128a, 128b) communicate with the first and second solenoid valves to direct flow from each pressure regulator to the shuttle valve device when the traction solenoid valve is in its first towing position. A control system located between the outlets of each pressure regulator to prevent and to circulate the pump device to such solenoid valves when in its second position. 20. A wheel according to claim 19, wherein a pair of wheels are driven by the engine, the control device comprising: a device for comparing the rotational speeds of the driven wheels, a device for determining when the driver has operated the first device 22, a driven wheel Device for generating a traction control signal and transmitting it to the traction solenoid valve when the difference in the rotational speeds of the engines exceeds the predetermined level, and to the pumping device during a period not accompanied by the driver's brake application, A device for increasing the brake pressure on the brake cylinder of the higher speed wheel to maintain the solenoid valve corresponding to the higher speed rotating wheel in one state and to cause the other solenoid valve to be in its second state. And thereby preventing brake cylinder application by rotating the driven wheels The control system characterized in that comprises a device for normalizing. ※ Note: The disclosure is based on the initial application.