JPH0692225B2 - Control device for anti-skidding - Google Patents

Description

The present invention relates to an anti-skid control device mounted on a brake device of a vehicle or the like.

[Conventional technology]

The present applicant has previously proposed, as an apparatus of this type, a shutoff valve disposed between a master cylinder and a wheel cylinder, and a volume of the shutoff valve on the wheel cylinder side that is movable so as to open and close the shutoff valve. Of the control piston, a pressure chamber into which a pressure that urges the control piston in the direction of opening the shut-off valve against the pressure on the wheel cylinder side is introduced, and a discharge pressure in the pressure chamber. An electromagnetic pump that is provided so that it can be supplied and that is driven based on a loading command from a control unit that determines the rotational state of the wheels, and a valve that opens based on a slack command from the control unit to open the pressure chamber on the suction side of the electromagnetic pump. And a solenoid valve communicating with the solenoid valve and the discharge side pressure of the pressure chamber or the electromagnetic pump are detected, and this pressure keeps the control piston at the opening position of the shutoff valve. And a pressure switch that switches so as to stop the output of the drive signal when the pressure becomes equal to or higher than a predetermined pressure, and the drive signal is output by the pressure switch after the end of anti-skid control, It has been proposed to drive the electromagnetic pump until the output of the drive signal is stopped according to the drive signal.

With these types, when pressure is supplied from the master cylinder to the wheel cylinders and the rotating wheels are being braked, when a loosening command is issued from the control unit, the solenoid valve is opened based on this loosening command. The pressure in the pressure chamber that was urging the control piston to the open position of the shut-off valve against the pressure supplied to the wheel cylinder is discharged to the suction side of the electromagnetic pump, and the pressure supplied to the wheel cylinder causes The shutoff valve is closed according to the movement of the pressed control piston, and the volume on the wheel cylinder side shut off from the master cylinder side is thereby increased to reduce the pressure on the wheel cylinder side. Then, after the loosening command from the control unit disappears and the solenoid valve closes, when the control unit issues a loading command, the electromagnetic pump is driven to suction and pressurize the hydraulic fluid discharged based on this loading command. Then, the discharge pressure is supplied to the pressure chamber to increase the pressure in the pressure chamber, and the control piston is moved against the pressure on the wheel cylinder side, thereby reducing and decreasing the volume on the wheel cylinder side. The pressure on the wheel cylinder side is increased, and thereafter, the same operation as described above is repeated based on the loosening command or the containment command to adjust the pressure on the wheel cylinder side and anti-skid control is performed.

Also, when the above-mentioned anti-skid control ends,
If the pressure on the discharge side of the pressure chamber or the electromagnetic pump falls below a predetermined pressure and the pressure switch detects this and switches to a state in which a drive signal is output, the electromagnetic pump is driven according to the drive signal. When the pressure on the pressure chamber side is increased and the pressure switch switches to a state in which the output of the drive signal is stopped in response to the pressure on the pressure chamber side becoming higher than a predetermined pressure, the drive of the electromagnetic pump is stopped. There is. Then, due to the rise in the pressure in the pressure chamber due to the driving of the electromagnetic pump, the control piston is returned to the direction in which the shutoff valve opens, and the pressure in the pressure chamber that exceeds a predetermined pressure is supplied from the master cylinder to the wheel cylinder. The control piston is biased against the applied pressure, and the shut-off valve is kept open via the control piston.

[Problems to be Solved by the Invention]

In the above-mentioned one, there is an advantage that the reduced pressure on the wheel cylinder side can be stably increased in accordance with the pressure liquid discharge action of the electromagnetic pump during the anti-skid control, while the loading command or the drive signal is transmitted. If a failure of the electromagnetic pump occurs that it does not discharge the pressure fluid even if it is given, the pressure on the wheel cylinder side reduced by opening the solenoid valve cannot be increased, which not only disables the anti-skid control. After that, the shutoff valve remains closed, and there is a problem that even the pressure cannot be supplied from the master cylinder to the wheel cylinder.

For this reason, it is necessary to detect beforehand whether the electromagnetic pump has failed or not before anti-skid control is performed. If the pressure circuit system such as the suction side or the pressure chamber is additionally provided, a new problem arises that the pressure circuit system becomes complicated.

The present invention has been made in view of the above problems, and is an anti-skid control capable of detecting a failure of the electromagnetic pump described above without complicating the existing structure of the pressure circuit system provided with the electromagnetic pump. The purpose is to provide a device.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides the anti-skid control device as described above, wherein the shut-off valve is relaxed for a predetermined time so as to reduce the pressure of the pressure chamber below the predetermined pressure when the brake is not operating. Therefore, there is provided a failure detection device that issues a failure signal when the pressure switch does not switch to stop the output of the drive signal.

[Work]

According to this means, first, the pressure on the discharge side of the pressure chamber or the electromagnetic pump is changed without affecting the brake operation.
The pressure is lowered by opening the solenoid valve, and becomes lower than a predetermined pressure for keeping the shutoff valve in the open state via the control piston, so that the pressure switch is switched to a state in which a drive signal is output. The electromagnetic pump is driven, but if the electromagnetic pump fails and the pressure on the discharge side or in the pressure chamber does not rise above a predetermined pressure, the pressure switch stops outputting the drive signal. A failure signal is issued from the failure detection device in response to this without switching to the ON state again.

〔Example〕

An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is a diagram showing an embodiment of the present invention together with a piping system of a brake device, and FIG. 2 is a fault detection unit (5 shown in FIG.
9 is a flowchart showing the operation of 9).

In FIG. 1, the anti-skid hydraulic pressure control device of the present embodiment is indicated by (1) as a whole, and hydraulic pressure is supplied from a master cylinder (2) with a vacuum booster. That is, the master cylinder with vacuum booster (2) is a known vacuum booster (3) and master cylinder (4).
The vacuum booster (3) is driven by the brake pedal (5), and its output drives the master cylinder (4). It is assumed that one hydraulic pressure generating chamber in the master cylinder (4) is connected to the front wheel cylinder through a pipe (6) and a device similar to the hydraulic pressure control device (1) shown in FIG. The other hydraulic pressure generating chamber is provided with an input port (16) of a pressure regulator (8) described later via a pipe (7).
The first output port (17) of the device (8) is connected to the wheel cylinders (12) (13) of the rear wheels (10) (11) via the pipe (9), and the second output port (17) is connected to the second The output port (19) is connected to the pipe (9) via the pipe (14).

The control port (18) of the pressure regulator (8) is connected to the discharge port (27) of the electromagnetic pump (26) via the pipe (24) provided with the check valve (25).
Connected to the check valve (25) rather than the control port (1
Pipe (20) branched from pipe (24) on the 8) side, solenoid valve (2)
It can be connected to the reservoir (23) via 1) and the pipe (22). As is well known, the reservoir (23) has a main body (4
4) A piston (45) with a seal ring attached to this inner hole is slidable, and a relatively weak spring ((46) urging the piston (45) toward the through hole (47) side. (45)
A liquid chamber and an air chamber are defined on both sides of the. The liquid chamber communicates with the pipe (22) through the above-mentioned through hole (47), and further through the pipe (29) provided with the check valve (28), the discharge port also serving as the suction port of the electromagnetic pump (26). Connected to (27). The check valves (28) and (25) respectively allow the flow from the reservoir (23) side to the electromagnetic pump (26) side and from the electromagnetic pump (26) side to the control port (18) side, but prohibit the reverse. It is a thing. (7
Reference numeral 0) is a pressure switch provided on the control port (18) side of the check valve (25) of the pipe (24), and includes a pressure chamber (39) and an accumulator device (72) of a pressure regulator (8) described later. ) The pressure in the pressure accumulating chamber (78) is detected, and it switches when the pressure reaches a preset predetermined pressure.
It is turned off when the pressure becomes lower than a predetermined pressure.

On the discharge side of the electromagnetic pump (26), the input / output port of the accumulator device (72) is connected via a pipe (74) branched from the pipe (24) between the control port (18) and the check valve (25). (73) is connected. The accumulator device (72) is an accumulator (75) integrally assembled with an accumulator control valve device (80) described later.
Is a gas in which a flexible membrane plate (77) is arranged in a spherical main body (76), and high pressure nitrogen gas is enclosed in the main body (76) by the membrane plate (77) as is known. A chamber and a pressure accumulating chamber (78) are defined. The accumulator (78) is connected to the passage (7
It is possible to communicate with the above-mentioned input / output port (73) via 9). The control port (81) of the accumulator device (72) is connected to the pipe (7) connected to the hydraulic pressure generating chamber of the master cylinder (4) via the pipe (89).

The solenoid valve (21) is a two-position valve that switches in response to deenergization of the solenoid (21b), and when the solenoid (21b) is demagnetized, it is controlled by the biasing force of the spring (21a) (1).
The control port (18) is opened when the solenoid (21b) is energized by taking the position A that blocks the communication between the 8) side and the reservoir (23) side.
The position B is set so that the side and the reservoir (23) communicate with each other.

In the electromagnetic pump (26), the coil (50) wound around the bobbin (49) is arranged and fixed in the large diameter hole portion of the inner hole (53) of the main body (48), and the coil (50) slides in the center hole of the bobbin (49). A main plunger (51) made of a magnetic material is movably fitted. The coil (50) is excited by the current from the control unit (57), but the drawing shows the non-excited state, and the main plunger (51) is in contact with the bottom portion (48a) of the main body (48).

A stepped sub-plunger (52) is slidably fitted to the small diameter hole of the inner hole (53) of the main body (48) with a seal ring (54) interposed therebetween. It is biased and is in contact with the main plunger (51). In the normal state shown in the figure, a liquid chamber (56) having a predetermined volume (for example, 0.1 cc) is formed between the end surface (52a) of the sub-plunger (52) and the end surface (48b) of the inner wall of the main body (48). It communicates with the above-mentioned discharge port (27). When the coil (50) is excited, the main plunger (51)
Is urged by a magnetic attraction force and presses the sub-plunger (52) against the urging force of the spring (55). The end surface (52a) of the sub-plunger (52) is the inner wall end surface (48) of the main body (48).
It stops when it comes into contact with b), and the specified volume of hydraulic fluid is returned to the check valve (25) and piping (2
Feed it to the pressure regulator (8) side via 4). Coil (5
When the energization of (0) is cut off, the sub-plunger (52) and the main plunger (51) return to the positions shown in the figure by the urging force of the spring (55). The return stroke at this time causes the check valve (28)
A predetermined amount of hydraulic fluid is sucked from the reservoir (23) via the. The main plunger (51) made of a magnetic material and a part of the main body (48) form a magnetic circuit.

Master cylinder (4) and wheel cylinders (12) (13)
The pressure regulator (8) interposed between and has a stepped hole (30) formed inside the main body (15) and communicates with the input port (16) communicating with the master cylinder (4). A stepped cut valve body (32) having a plurality of grooves formed on the outer periphery is slidably fitted to the inner side of the large diameter hole. The cut valve main body (32) is liquid-tightly screwed to the opening of the stepped hole (30) and has an inner end of the lid (60) provided with the second output port (19) and the cut main body (32). 32) is urged toward the valve seat (37) by the first valve spring (40) that is stretched between the valve seat (37) and the valve seat (37), and the valve seat (37) is attached to or detached from the outer circumference of the end facing the valve seat (37). An annular valve body (31) made of synthetic rubber capable of sitting is attached. In the through hole (32a) of the cut valve body (32), a valve ball (35) that can be seated on and detached from a tapered valve seat (32b) provided on the end side where the valve body (31) is mounted. However, a valve is provided by a second valve spring (42) stretched between the valve ball (35) and a lid member (33) having a throttle (34) attached to the end opposite to the lid (60). It is biased toward the seat (32b) and stored. The second valve spring (4
The spring force of 2) is set weaker than the spring force of the first valve spring (40) described above.

A control piston (36) having a pair of sealing members (38) mounted on the outer periphery is slidably fitted in the small diameter hole portion of the stepped hole (30) communicating with the first output port (17). A volume chamber (41) is defined between the control piston (36) and the valve seat (37), which is in constant communication with the wheel cylinders (12) and (13) through the first output port (17). A pressure chamber (39) is defined on the opposite side of the control piston (36) so as to face the volume chamber (41) and communicate with the control port (18). The control piston (36) is capable of pressing the cut valve body (32) in a direction away from the valve seat (37), and the end portion on the side of the volume chamber (41) can contact the cut valve body (32). Further, a shaft-like portion (43) capable of contacting the valve ball (35) inside the cut valve body (32) is integrally provided at the end portion on the side of the volume chamber (41). Thus, according to the movement of the control piston (36) due to the pressure difference generated between the volume chamber ((41) side and the pressure chamber (39) side, the valve body (31) is attached to or detached from the valve seat (37). The seating / seating of the valve ball (35) with respect to the valve seat (32b) is controlled, and the seat (37) (32b) of the valve body (31b) and the ball (35) is seated on the input port (16). The volume change of the volume chamber (41) shut off from the () side is controlled.

A stepped hole (30) of the body (15) provided with a second output port (19)
The inwardly extending lid (60) has a stepped hole (63) in which a large-diameter hole opens toward the cut valve body (32). The stepped hole (63) has an input port. (16) side and second output port (18)
The bypass piston (64) provided with the through hole (65) capable of communicating with the side has a second lip portion on the outer circumference of the small diameter portion (64a).
The cup seal (66) is attached to the output port (19) side, and the seal ring (67) is attached to the outer periphery of the large diameter portion (64b) so that the cup seal (66) is movably fitted. The tube sheet (61) provided with the through hole (69) press-fitted into the lid (60) to connect the second output port (19) and the inside of the stepped hole (63) has the stepped hole (63). A conical valve seat (62) is provided at the end protruding to the small diameter part (64) of the bypass piston (64) described above.
a) The periphery of the through hole (65) that opens to the end face is the valve seat (6
It is possible to put on and take off in 2). The end surface of the small diameter portion (64a) of the bypass piston (64) receives the urging force of the spring (68) arranged in the stepped hole (63), and the pipe (14) and the second output port (19). The hydraulic pressure on the wheel cylinder (12) (13) side can be received via the through hole (69). On the other hand, the end surface of the large diameter portion (64b) of the bypass piston (64) can receive the hydraulic pressure on the master cylinder (4) side via the input port (16) and the control piston (36). It is possible to receive a biasing force corresponding to the pressure of the pressure chamber (39) via the cut body (32) that is pressed and can come into contact with the end surface.

In this way, the small diameter part (64
a) The attachment / separation of the periphery of the opening of the through hole (65) with respect to the valve seat (62) is controlled according to the difference in the acting force generated between the end surface side and the end surface side of the large diameter portion (64b), and the second output Communication between the master cylinder (4) side and the wheel cylinder (12) (13) side via the port (19) is controlled, and the bypass piston (64) is placed on the cut valve body (32) side. When moving and the peripheral edge of the opening of the through hole (65) is separated from the valve seat (62), the portion of the large diameter portion (64b) where the seal ring (67) is attached becomes the opening of the stepped hole (63). It is designed to come out to the enlarged taper part (63a).

A stepped hole (83) is formed in the main body of the accumulator control device (80) integrally assembled with the accumulator (75) described above, and the pipe (89), A large-diameter piston (86) capable of receiving the hydraulic pressure of the master cylinder (4) at one end side through the control port (81), and a support member in which the shaft portion (85) is fitted in the stepped hole (83). The piston (84) supported by is seated on and detached from a tapered valve seat (87) formed on the opening peripheral edge of a small hole that communicates with the accumulator chamber (78) of the accumulator (75) via the passage (79). Possible valve ball (88) is brazed, and the valve ball (88) receives the biasing force of the spring (90).
Is urged in the direction to move it away from the valve seat (87),
5) is in contact with the other end of the large diameter piston (86). In this way, the accumulator control valve device (80) acts on the large-diameter piston (86) according to the hydraulic pressure on the master cylinder (4) side, and the small-diameter piston (8) in opposition to the acting force.
Both the pistons (84) (86) can move integrally by changing the magnitude relationship between the biasing force of the spring (90) acting on 4) and the acting force according to the accumulated pressure on the accumulator (75) side. The seating / seating of the valve ball (88) with respect to the valve seat (87) is controlled according to this movement. And by seating the valve ball (88) on the valve seat (87),
The communication between the pressure accumulator (75) of the accumulator (75) and the pressure chamber (39) side of the pressure regulator (8) via the input / output port (73) is cut off.

The solenoid valve (21) and the solenoid pump (26) of the hydraulic control device (1) described above are provided with a solenoid (21b) and a coil (5), respectively.
0) is the output terminal (57a) of the control unit (57)
It is connected to (57b) and is controlled by receiving signals S ₁ and S ₂ output from output terminals (57a) and (57b).

The control unit (57) includes an anti-skid control section (58) and a failure detection section (59), and a vehicle-mounted power source (neither is shown) via an ignition switch of the vehicle.
The power is supplied from the power supply when the ignition switch is turned on. The anti-skid controller (58) has its input terminal (58
Although not shown in a), the output terminals of the wheel speed detectors provided on each wheel are connected, and various calculations and judgments are performed based on the outputs of these detectors, and brake slack signals and brake re-insertion signals are sent. When the brake slack signal is generated, the output signal S ₁ of the output terminal (57a) is high level "1" to excite the solenoid (21b), and the coil (50) is generated.
The output signal S of the output terminal (57b) to keep the
₂ becomes low level “0”. When the brake re-load signal is generated, the output signal S ₁ is low level “0” to demagnetize the solenoid (21b), and the output signal S ₂ is high level at appropriate time intervals to repeat the excitation / demagnetization of the coil (50). The pulse output switches between "1" and low level "0".

The failure detection part (59) is capable of detecting whether or not the brake is operated, and the input terminal (59a) thereof is switched from OFF to ON according to the depression of the brake pedal (5) to turn on the brake lamp. The output terminal of the switch (71) is connected, and the pressure switch (70) is ON or OF.
To detect whether it is F, press the pressure switch (7
0) output terminal is connected. Further, the solenoid (21b) of the solenoid valve (21) is connected to the anti-skid control section (58) described above and is connected to the solenoid pump (21b) via the output terminal (57a). It is connected to the coil (50) of (26). When the anti-skid control is not performed, the failure detection unit (59) sets the pressure in the pressure chamber (39) of the pressure regulator (8) and the pressure in the accumulator chamber (78) of the accumulator device (72) to a predetermined pressure or more. It is also equipped with an electromagnetic pump drive control function to raise the pressure, and the anti-skid control section (58) detects that the anti-skid control based on the brake slack signal and the brake re-insertion signal is not performed, and the pressure switch (70 )But
Output signal S ₁ is “0”, output signal S ₂
Is used as a pulse output, and after the pressure switch (70) is switched from OFF to ON, the number of pulse output pulses is counted to make signal S ₁ “0” and signal S ₂ pulse output for a certain period of time. Is possible.

Then, the failure detecting section (59) is connected to the electromagnetic pump (26),
It is possible to detect a failure of the pressure switch (70) or a failure such as a pressure leak in the control pressure piping system equipped with these.
Brake switch (71) is OFF, pressure switch (70) is O
When N, the output signal S ₁ is "1", the output signal S ₂ is "0",
After that, if the pressure switch (70) does not switch from ON to OFF within a predetermined time (t ₁ shown in FIG. 2), or if the output signal S _{1 is set} to “1”, the pressure switch (70) Is switched from ON to OFF within a predetermined time. Depending on the switching, signal S ₁ becomes “0” and signal S ₂ becomes pulse output,
If the pressure switch (70) is not switched from OFF to ON within a time (depending on the counting of the number of pulses of the pulse output) separately from the above predetermined time, a failure signal can be generated. Then, based on the occurrence of the failure signal, an anti-skid control disabling instruction is given to the anti-skid control section (58) and a lamp (which is connected to the failure detection section (59) installed on the instrument panel in the vehicle compartment ( 91) is made to blink, and the output signal S _{1 is set} to “1” for a time (t ₂ shown in FIG. ₂ ) set to be sufficiently longer than the above predetermined time, and is always connected to the on-vehicle power supply. The occurrence of a failure is stored in a storage device (not shown).

When the pressure switch (70) returns from the OFF state to the ON state as specified, the failure detecting section (59) sends an anti-skid control permission command to the anti-skid control section (58) without generating a failure signal. As long as the pressure switch (70) is kept on for a period of time (T shown in FIG. 2) set by this timer, the failure detection operation described above is performed unless the ignition switch is turned off. It can be repeated every time the set time of the timer elapses.

Next, regarding the operation of the present embodiment shown in FIG.
This will be described with reference to the flowchart of FIG. It should be noted that the same device as the device (1) shown in the figure is also provided in the brake system for the front wheels (not shown) connected to the master cylinder (4) through the pipe (6). The operation will be described only for the rear wheel (10) (11) system.

Now, assuming that the driver gets on a vehicle equipped with the hydraulic pressure control device (1) and the master cylinder with vacuum booster (2), and turns on the ignition switch to start the engine, the control unit ( 57) is supplied with power from the vehicle-mounted power source, the failure detection section (59) starts operating, and first lights the notification lamp (91). And
Occurrence of failure is not remembered, pressure switch (70)
Is ON, the brake switch (71) is OFF, and it is confirmed that the brake pedal (5) is not depressed, the failure detection section (59) causes the failure detection section (59) to connect to the solenoid (57a) connected to the output terminal (57a). The output signal S ₁ to 21b) is changed from "0" to "1". In response to this, when the solenoid (21b) is excited and the solenoid valve (21) is switched from the position A to the position B, the pressure chamber (39) of the pressure regulator (8) and the accumulator chamber (72) of the accumulator device (72). The 78 () side and the reservoir (23) side communicate with each other, and the pressure liquid contained in the pressure chamber (39) and the pressure accumulation chamber (78) is stored in the liquid chamber of the reservoir (23) via the pipes (24) (20). Will be discharged to. In this way, the pressure in both chambers (39) and (78) decreases, and the output signal S _{1 is set} to "1" for a predetermined time.
Since the pressure becomes lower than the predetermined pressure by the time t ₁ (for example, 1 [sec]) elapses, the pressure switch (70) is turned on.
If it is switched to OFF, the failure detection section (59) causes the electromagnetic pump drive control function to act in accordance with the switching to output the output signal S ₁ “0” and the coil connected to the output terminal (57b). The output signal S ₂ to (50) is a pulse output that switches between "1" and "0" at an appropriate time interval.

Accordingly, when the signal S ₂ becomes “1” and the coil (50) is excited, the electromagnetic pump (26) causes the main plunger (51) and the sub plunger (52) to move to the spring (55) due to the magnetic attraction force. And moves forward against the spring force of the liquid chamber (56), and discharges a constant volume of liquid in the liquid chamber (56) to the pressure chamber (39) and the pressure accumulation chamber (78) side via the check valve (25). The sub-plunger (52) stops when its end face (52a) contacts the inner wall end face (48b) of the main body (48), but when the signal S ₂ becomes "0" and the coil (50) is demagnetized thereafter. , The primary plunger ((51) and the secondary plunger (5
2) is returned by the spring force of the spring (55), and the reservoir (2
A constant volume of liquid is sucked into the liquid chamber (56) from 3) through the check valve (28). Signal S ₂ becomes “1” again and coil (50)
Is excited, both plungers (51)
By the forward movement of (52), the liquid sucked from the reservoir (23) is discharged to the pressure chamber (39) side. Thus electromagnetic pump (26)
However, due to the demagnetization of the coil (50) in response to the pulse output of the signal S ₂ , the pressure liquid discharge to the pressure chamber (39) side and the reservoir (23)
When the liquid is sucked repeatedly from the side, the pressure chamber (3
9), the pressure in the pressure accumulating chamber (78) gradually rises in response to the supply of pressurized liquid. Thus the pressure chamber is lower than a predetermined pressure (39), the pressure in the accumulation chamber (78) is, the signal S ₂ pulses of the pulse output, which is counted from the time of the pulse output is n ₁ (e.g., 20 ) Or less, and the pressure switch (70) switches from OFF to ON accordingly, the failure detection unit (59) indicates that the number of pulses after switching is n ₂ (for example, 40). After that, the signal S ₂ is further output as a pulse and the electromagnetic pump (26) is driven for a certain period of time.
The signal S _{2 is set} to “0”.

As described above, the failure detection section (59) outputs the output signal.
The time specified by the number of pulses n ₁ from when the pressure switch (70) is switched from ON to OFF within the time t ₁ after S _{1 is set} to “1” and the output signal S ₂ is pulse output thereafter. When it is detected that the pressure switch (70) will switch from OFF to ON before the time elapses, the pressure switch (70) turns the pressure chamber (39).
It is determined that the electromagnetic pump (26) can be driven normally and the pressure on the pressure chamber (39) side can be raised to a predetermined pressure or higher because it is in a normal state where it is switched to a predetermined pressure according to the pressure change on the side of the pressure chamber. . After that, the failure detection section (59) gives an anti-skid permission command to the anti-skid control section (58) and turns off the indicator lamp (91) that has been turned on so that the device (1) operates normally. Notify the driver that it is operational.

In addition, the failure detection unit (59) continues to detect the state of the pressure switch (70) after operating the timer and continues until the time T (for example, 2 [h]) set by the timer elapses. If 70) is kept ON and the ignition switch is not turned OFF during that time, the failure detection operation as described above is repeated after the lapse of time T.

As described above, the device (1) determined to be normally operable by the failure detection unit (59) is in the state shown in the figure,
Assuming that the vehicle is running at a constant speed, the brake pedal (5) is not depressed and the output signals S ₁ , S ₂ of the antiskid control section (58) of the control unit (57) are
Are both "0". At this time, the solenoid valve (21) causes the pressure chamber (39) of the adjusting device (8) and the accumulator device (7).
The accumulator (75) side of 2) is cut off from the reservoir (23) side, and the pressure in the pressure chamber (39) causes the failure detection section (59) to switch the pressure switch (70) from OFF to ON as described above. By driving the electromagnetic pump (26) for a certain period of time using the post-switching signal S ₂ as a pulse output of the pulse number n ₂ , the pressure is kept higher than the predetermined pressure at which the pressure switch (70) switches. A pressure liquid having the same pressure as the pressure is stored in the pressure storage chamber (78). Then, in the pressure regulator (8), the control piston (36) receives the pressure of the pressure chamber (39) to move the cut valve body (32) and the valve ball (35) to the respective valve springs (40) (42). By pressing against the spring force, the valve body (31) and the valve ball (35) are both separated from the valve seats (37) (32b), and the input port (16) and the first
The output port (17) communicates with the volume chamber (41).
Further, the bypass piston (64) applies the urging force from the control piston (36) via the cut valve body (32) to the large diameter portion (64).
received in b) and resisting the spring force of the spring (68), the through hole (65)
Valve seat (62) provided on the tube seat (61) around the opening edge of
It is pressed to the position where it is seated on the input port (16) and the second
The output port (19) is shut off. In the accumulator device (72), the accumulator control valve device (8
The small diameter piston (84) of (0) is biased by the spring (90) and receives the pressure of the accumulator (78) to separate the valve ball (88) from the valve seat (87), and the accumulator (75 ) Side is in communication with the input port (73) side.

When the brake pedal (5) is strongly depressed to stop the vehicle in such a state, the hydraulic pressure generated in the master cylinder (4) causes the hydraulic pressure generated in the master cylinder (4) to pass through the pipe (7) to the input port (16) of the pressure regulator (8). ) Is supplied to the volume chamber (41) and acts on the control piston (36), but the pressure on the pressure chamber (39) side is sufficiently higher than the pressure on the volume chamber (41) side. ) Is stopped, the hydraulic pressure supplied to the volume chamber (41) is supplied to the wheel cylinders (12) and (13) through the first output port (17) and the pipe (9). At the same time, the hydraulic pressure generated in the master cylinder (4) is changed to the piping (89).
Is supplied to the control port (81) of the accumulator device (72), and the large diameter piston (86) of the accumulator control valve device (80) receives hydraulic pressure from the master cylinder (4),
The small diameter piston (84) is moved against the spring force of the spring (90) and the biasing force of the accumulator (75) according to the accumulated pressure. When the valve ball (88) is seated on the valve seat (87), the communication between the storage chamber (78) of the accumulator (75) and the accumulator chamber (39) side of the pressure regulator (8) is cut off. .

From master cylinder (4) to wheel cylinder (12) (1
The brake pressure starts to be applied to the rear wheels (10) and (11) by supplying the hydraulic pressure to 3), and the hydraulic pressure in the wheel cylinders (12) and (13) also increases in accordance with the increase in the hydraulic pressure in the master cylinder (4). When the anti-skid control section (58) of the control unit (57) determines that the brake is overloaded, the output signal S ₁ of the output terminal (57a) becomes "1". As a result, the solenoid (21b) of the solenoid valve (21) is excited, and the solenoid valve (21) disconnects the pressure chamber (39) side and the reservoir (23) side of the pressure regulator (8) from the position A. The position is switched to the communicating position B. Pressure chamber (3) of pressure regulator (8)
When the pressure liquid contained in 9) is discharged into the liquid chamber of the reservoir (23) and the pressure in the pressure chamber (39) drops, the control piston (36) is supplied from the input port (16). The pressure in the pressure chamber (3
9) Move to the side. With the movement of the control piston (36), the cut valve body (32) moves toward the volume chamber (41) by the spring force of the first valve spring (40), and the valve body (31) moves to the valve seat (37).
Then, the valve ball (35) in the cut valve body (32) is seated on the valve seat (32b) by the spring force of the second valve spring (42), and the input port (16) and the volume chamber (41 ) Communication is cut off. The control piston (36) is connected to the wheel cylinder (12) (1
Receives the hydraulic pressure on the 3) side and moves to the pressure chamber (39) side,
In response to this, the volume of the volume chamber (41) increases, so that the hydraulic pressure of the wheel cylinders (12) (13) communicating with the volume chamber (41) via the first output port (17) decreases. I will do it.

As described above, when the control piston (36) starts to move to the pressure chamber (39) side, the pressure in the pressure chamber (39) falls below the predetermined pressure and the pressure switch (70) turns from ON to OFF. The failure detection section (59) of the control unit (57) detects that the pressure switch (70) is turned off, but the failure detection section (59) is detected by the anti-skid control section (58). The output signals S ₁ and S ₂ are not changed until it is determined that anti-skid control is being performed and the anti-skid control is completed.

The bypass piston (64) arranged between the input port (16) and the second output port (19) has a pressure chamber (39) via the control piston (36) by the movement of the cut valve body (32). ) Side, the large diameter part (64b) end face will not receive the urging force,
Also, the end face of the small diameter part (64a) receives hydraulic pressure on the wheel cylinder (12) (13) side via the pipe (14), but the end face of the large diameter part (64b) receives the input port (16 ) Through the master cylinder (4) side, and the large diameter part (64
The acting force obtained by multiplying the pressure receiving area difference between b) and the small diameter portion (64a) by the hydraulic pressure is larger than the spring force of the spring (68).

Therefore, the bypass piston (64) is attached to the tube seat (6
It continues to be pressed toward 1) and the input port (16) side and the second output port (19) side are shut off by the seating on the valve seat (62) at the opening peripheral edge of the through hole (65). To be kept.

When the brake is loosened in accordance with the decrease in the hydraulic pressure on the wheel cylinder (12) (13) side, and the antiskid control section (58) determines that the brake is excessively loosened, the output terminal (57a ) Output signal S ₁ is switched from "1" to "0", the solenoid (21b) of the solenoid valve (21) is demagnetized, and the solenoid valve (21) is forced by the spring force of the spring (21a) into the pressure chamber (39a). ) Side and the reservoir (23) side are cut off to a position A. At this time, from the pressure chamber (39) to the reservoir (23)
When the liquid discharge to the liquid chamber of the wheel cylinder is stopped, the movement of the control piston (36) stops, the volume of the volume chamber (41) does not change, and the hydraulic pressure on the wheel cylinder (12) (13) side becomes constant. Kept in. Then carp output signal S ₂ of the output terminals of the Control Unit (57) (57b) is at an appropriate time interval becomes earnestly switched pulse output to "1" and "0".

In the electromagnetic pump (26), the coil (50) is de-energized in response to the pulse output of the signal S ₂ , so that the main and sub plungers (51) (52) move forward to move from the liquid chamber (56) to the pressure chamber. (39)
The liquid discharge to the liquid chamber and the liquid suction from the reservoir (23) to the liquid chamber (56) by the return movement of both plungers (51) (52) are repeated.
By sending a fixed volume of liquid into the pressure chamber (39),
The control piston (36) is moved to the liquid volume chamber (41) side. Then, in response thereto, the volume of the volume chamber (41) decreases, and the hydraulic pressure on the wheel cylinder (12) (13) side increases by the decrease. When both plungers (51) (52) are moving back to suck the liquid, the pressure liquid is not supplied to the pressure chamber (39), so that the hydraulic pressure on the wheel cylinder (12) (13) side is constant. Become.

In this way, while the anti-skid control section (58) outputs the output signal S ₂ as a pulse output, the electromagnetic pump (26) repeatedly feeds a fixed volume of the pressure fluid into the pressure chamber (39), whereby the control piston The (36) moves while decreasing the volume of the volume chamber (41), and accordingly, the hydraulic pressure on the wheel cylinder (12) (13) side gradually increases. Then, in accordance with the movement of the control piston (36), the shaft-like portion (43) provided at the end of the control piston (36) presses the valve ball (35) and the valve seat (32
When separated from b), the stepped hole (3
The hydraulic pressure of the master cylinder (4) supplied to the inside of the cut valve body (3) from the throttle hole (34) of the lid member (33).
2), is supplied to the wheel cylinders (12) and (13) through the volume chamber (41) and the first output port (17), which further increases the hydraulic pressure on the wheel cylinders (12) and (13) side. To do.

When the brakes of the rear wheels (10) and (11) are applied in this way and the anti-skid control unit (58) determines that the brakes are applied too much, the output S ₁ of the output terminal (57a) becomes "1". . At this time, the pulse output of the output S _{2 at} the output terminal (57b) has already disappeared.

When the output S ₁ becomes “1”, as described above, the pressure chamber (39)
The pressure liquid inside is discharged to the reservoir (23) through the solenoid valve (21), and the pressure inside the pressure chamber (39) is reduced. And
The volume of the volume chamber (41) increases in accordance with the movement of the control piston (36) to the pressure chamber (39) side, and the wheel cylinder (12)
The hydraulic pressure on the (13) side drops again.

Thereafter, similar to the above, the operation of holding, increasing, and decreasing the hydraulic pressure on the wheel cylinder (12) (13) side is repeated based on the signals S ₁ and S ₂ from the anti-skid control unit (58), Anti-skid control is continued and the rear wheels (10) (1
The vehicle slows down and stops without locking in 1).

When the above-mentioned anti-skid control is completed, the pressure in the pressure chamber (39) of the pressure regulator (8) is changed to the valve body (31) and the valve ball (3).
If the pressure is lower than the predetermined pressure that urges the control piston (36) to keep the valve 5 (5) separated from each valve seat (37) (32b), the pressure switch (70) is turned off. The failure detection section (59) of the control unit (57) detects it and outputs the output signal S ₂ as a pulse output. As a result, the electromagnetic pump (26) is driven so that the discharge pressure liquid is discharged from the pressure chamber (3
9) is supplied to the wheel cylinder (1) when the desired brake operation is obtained by the anti-skid control and the brake pedal (5) is released.
2) The pressure liquid supplied to (13) is the first output port (17),
At the same time as being released to the master cylinder (4) side through the volume chamber (41) and the input port (16), in the accumulator device (72), the large diameter piston (86) of the accumulator control valve device (80) is installed. As the hydraulic pressure of the master cylinder (4) being pressed decreases, both pistons (84) (86) move the control ports (81) by the spring force of the spring (90) and the biasing force of the accumulator (75). ) Side to the valve ball (8
8) separates from the valve seat (87), and the accumulator chamber (78) communicates with the input / output port (73) side. Therefore, after the end of the anti-skid control, the control piston (36) receives not only the discharge pressure liquid from the electromagnetic pump (26) but also the pressure liquid sent from the accumulator (75), and the valve body (31) and the valve. The ball (35) is quickly returned to the position where it is separated from each valve seat (37) (32b).

When the pressure on the pressure chamber (39) side rises in response to the drive of the electromagnetic pump (26) and becomes equal to or higher than a predetermined pressure, the pressure switch (70)
Is switched from OFF to ON, the failure detection unit (59) further outputs the signal S ₂ until the number of pulses after the switching reaches n ₂ . As a result, the electromagnetic pump (26) continues to be driven until a certain period of time corresponding to the pulse number n ₂ elapses, and the discharge pressure liquid is replenished to the accumulator (78) of the accumulator (75).

In this way, when the brake operation is released, the accumulator chamber (39) of the pressure regulator (8) and the accumulator chamber of the accumulator (75) are shut off from the reservoir (23) side by the solenoid valve (21). A pressure higher than that of a predetermined accumulator is contained in the (78), the device (1) returns to the illustrated state, and the volume chamber (41) of the pressure regulator (8) and the first output port (17).
The communication between the master cylinder (4) side and the wheel cylinder (12) (13) side via the is maintained.

The case where both the electromagnetic pump (26) and the pressure switch (70) are normal has been described above. Next, the case where a failure occurs in the pressure switch (70) or the electromagnetic pump (26) will be described.

Now, when the ignition switch is turned on and power is supplied to the control unit (57), or the ignition switch is turned on, the pressure switch (70) remains on after the predetermined failure detection operation described above has been performed. After a lapse of the time T set in step 1, the failure detection section (59) detects that the pressure switch (70) is ON and the brake switch (71) is OFF, and the output signal S _{1 is set} to “1”. " In response to this, the solenoid (21b) is excited, so that the pressure liquid contained in the pressure chamber (39) and the pressure accumulating chamber (78) is stored in the reservoir (2) via the solenoid valve (21).
It is discharged to 3) and the pressure in both chambers (39) (78) drops and becomes lower than the predetermined pressure within a predetermined time t ₁ , but, for example, the contact is stuck to the pressure switch (70). If a failure occurs and the pressure switch (70) does not switch to OFF within the predetermined time t ₁ , but remains ON after the time t ₁ , the failure occurs because there is no switching from ON to OFF. The detection section (59) generates a failure signal. Alternatively, the signal S ₁
Pressure switch (70) from ON to "1" and the after time t ₁
In response to switching to OFF, the failure detector (59)
_{1 is set} to “0” and the signal S ₂ is output as a pulse.
For example breaking of the coil (50), failure of the electromagnetic pump (26) that does not make the desired liquid discharge action by breakage of the seal ring (54) occurs, the number of pulses from the time of the signal S ₂ output pulses n _The pressure on the pressure chamber (30) side does not rise to the specified pressure within the time until it becomes ₁ and the pressure switch (70) turns off.
If it is not switched from F to ON, the failure detection section (59) will generate a failure signal in response to the lack of switching. Also,
After the electromagnetic pump (26) and the pressure switch (70) are judged to be normal due to the predetermined failure detection operation, the anti-skid control permission command is issued, and then the time T set by the timer is reached.
The pressure on the side of the pressure chamber (39) falls below the prescribed pressure due to pressure leakage, and the pressure switch (70)
When switching from ON to OFF, the pressure switch (70) turns on when the failure detection operation starts or the anti-skid control ends.
If the pressure switch (70) does not turn ON until the number of pulses n ₃ (n ₃ > n ₁ + n ₂ ) is reached after the signal S ₂ is output as a pulse in response to being OFF. Also produces a fault signal.

The failure detection section (59), based on the generated failure signal,
An anti-skid control non-permission command is given to the anti-skid control section (58), and a notification lamp (91) is made to blink to notify the driver that the anti-skid control will not work due to the occurrence of a failure. After that, when it is further detected that the brake switch (71) is OFF, the output signal S _{1 is set} to “1” until the time t ₂ (for example, 30 [sec]) set to be sufficiently longer than the time t ₁ has elapsed. " In addition, the occurrence of a failure is stored in a memory device that is always connected to a power supply,
While the ignition switch is ON, it keeps generating a fault signal.

As described above, the signal S ₁ is set to “1” until the time t ₂ elapses, so that the pressure in the pressure chamber (39) and the pressure accumulating chamber (78) is reduced to a value sufficiently lower than the predetermined pressure. In the pressure regulator (8), the force that the control piston (36) urges the cut valve body (42) from the pressure chamber (36) side is the valve spring (40).
If it becomes smaller than the spring force of (42), the cut valve body (32) presses the control piston (36) and the valve seat (37).
Move to the side. Then, the bypass piston (64) provided between the input port (16) and the second output port (19) is controlled by the control piston through the cut valve body (32) that abuts the end face of the large diameter part (64b). The urging force transmitted from the (36), that is, the force pressed to the tube sheet (61) side is no longer received. Then, since the brake is not operated on the end surface of the large diameter portion (64b) and the end surface of the small diameter portion (64a), the hydraulic pressure of the master cylinder (4) and the wheel cylinders (12) and (13) is not received. The pistol (64) has a small diameter section (64
a) It is pressed by the spring force of the spring (68) acting on the end face and moved to the cut valve body (32) side. In response to this movement, the opening peripheral edge of the through hole (65) on the end surface of the small diameter portion (64a) separates from the valve seat (62), and the portion of the large diameter portion (64b) where the seal ring (67) is attached becomes The liquid that is generated in the master cylinder (4) comes out through the tapered portion (63a), the input port (16) and the second output port (19) communicate with each other through the through hole (65) and the through hole (69). 2nd output port (19), piping (1
It becomes possible to supply to the wheel cylinders (12) and (13) through 4).

From master cylinder (4) to wheel cylinder (12) (1
When hydraulic pressure is supplied to 3), the small-diameter portion (64a) end surface and the large-diameter portion (64b) end surface of the bypass piston (64) respectively receive the hydraulic pressure, but the large-diameter portion (64b) The part where the seal ring (67) is attached comes out to the taper part (63a), so that the hydraulic pressure also acts on the step part that connects the small diameter part (64a) and the large diameter part (64b), and the bypass piston (64 ) Is
An equal hydraulic pressure will be applied to each of the opposing pressure-receiving surfaces of substantially equal area. Therefore, until the failure as described above is repaired and the biasing force from the control piston (36) acts on the end surface of the large diameter portion (64b) of the bypass piston (64) via the cut valve body (32). In the meantime, the bypass piston (64) is not seated on the valve seat (62) and the communication between the input port (16) and the second output port (19) is maintained regardless of whether or not hydraulic pressure is generated. Further, the failure detection section (59) once sets the output signal S ₁ to “1” for a time t ₂ based on the failure signal and puts the pressure regulator (8) into the above state, and then turns on the ignition switch. Every time the power is turned from OFF to ON, a failure signal is generated because the failure occurrence is stored in memory, an anti-skid control disapproval command is issued based on the failure signal, and the notification lamp (91) blinks.

When the malfunction of the electromagnetic pump (26) or pressure switch (70) is repaired, the memory of the malfunction is erased by disconnecting the connection between the storage device and the power supply, and then the ignition switch is turned on and the malfunction detection unit (59). ) Is operated, it is confirmed whether the device (1) has returned to a normal state where the pressure chamber (39) side pressure of the pressure regulator (8) is equal to or higher than a predetermined pressure, and the pressure chamber (39) side. When the pressure exceeds a predetermined pressure, the bypass piston (64) applies a biasing force corresponding to the pressure to the control piston (36) where the seal ring (67) is attached to the stepped hole (63). Of the through hole (65) at the end of the small-diameter portion (64a) is returned to the position where it is seated on the valve seat (62), and the input port (16) and the second output port (19) are connected. Communication is cut off.

As is clear from the above description, in the present embodiment, the solenoid valve (21) for exciting the solenoid (21b) when the brake switch (71) is OFF and the pressure switch (70) is ON. and "1" output signal to, when then pressure switch at a predetermined time t ₁ (70) does not change over to OFF from oN, or pressure switch (70) is OFF when the anti-skid control is not performed The output signal S ₂ to the electromagnetic pump (26) accordingly corresponds to the coil (50).
If the pressure switch (70) does not switch from OFF to ON within the time specified by the number of pulses n ₁ or n ₃ after the pulse output that can excite / demagnetize is output, the failure detection unit (59) ), The anti-skid controller (5
When the anti-skid control is not performed by 8), the failure of the electromagnetic pump (26) and the pressure switch (70) is detected, and based on the occurrence of the failure signal, the notification lamp (91) blinks and the master cylinder ( Since the 4) side and the wheel cylinder (12) (13) side are directly connected, a failure occurs in the electromagnetic pump (26) and the pressure switch (70), and the wheel cylinder (12) (13) side liquid Even if the pressure on the pressure chamber (39) side that urges the control piston (36) of the pressure regulator (8) against pressure cannot be increased, the driver is informed of this and the wheel cylinder ( 12) (13) It is possible to prevent the hydraulic pressure from becoming impossible to rise. Also, a solenoid valve (21) for reducing the hydraulic pressure on the wheel cylinder (12) (13) side during anti-skid control, and a pressure switch for controlling the drive of the electromagnetic pump (26) when not performing anti-skid control. Since the existing components such as (70) are used to detect failures as described above,
It is not necessary to separately install a failure detection mechanism in the control pressure circuit system for controlling the pressure on the pressure chamber (39) side provided with the electromagnetic pump (26), the reservoir (23) accumulator device (72), etc. The structure of the control pressure circuit system does not become complicated.

Although the embodiment shown in the drawings has been described above, the present invention is not limited to this. For example, the electromagnetic pump (26)
Signal S ₂ the number of pulses output signal S ₂ for the count
Instead of calculating the elapsed time from when is the pulse output, a timer may be used to measure the elapsed time to detect a failure, and the output signal S ₁ to the solenoid valve (21) may be detected. "1" with a decrease time after the elapsed time from when the output signal S ₂ and the pulse output, the pressure in order to urge through the control piston (36) in the open position the transient valve body (32) The pressure may be appropriately set according to the pressure to be contained in the chamber (39) side, the pressure storage capacity of the accumulator (75), and the known liquid amount of the electromagnetic pump (26).

The present invention also provides a hydraulic control device that does not use an accumulator device (72) for quickly returning the control piston (36) when releasing the brake operation, the master cylinder (4) side and the wheel cylinders (12) (13). ) Side can bypass the volume chamber (41) and communicate with the bypass valve, which is also applicable to the one in which the bypass piston faces the hydraulic pressure on the wheel cylinder side and directly receives the discharge side accumulator of the electromagnetic pump. Is.

〔The invention's effect〕

As is clear from the above description, according to the present invention, it is possible to detect and inspect whether or not the pressure liquid discharging action of the electromagnetic pump is normally performed by utilizing the existing electromagnetic valve and pressure switch. Therefore, without complicating the structure of the pressure circuit system provided with the electromagnetic pump, the failure of the electromagnetic pump can be detected in advance before the anti-skid control that requires the discharge action of the electromagnetic pump is performed. When the failure is detected, the driver of the vehicle is notified of the failure based on the generation of the failure signal by the failure detection device, or the brake operation is enabled by directly communicating the master cylinder side and the wheel cylinder side. It is possible to deal with the failure of the electromagnetic pump.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention together with a piping system of a brake device, and FIG. 2 is a fault detection unit (5 shown in FIG.
9 is a flowchart showing the operation of 9). (1) …… Anti-skid hydraulic pressure controller (8) …… Pressure regulator (21) …… Solenoid valve (26) …… Electromagnetic pump (32) …… Cut valve body (36) …… Control piston ( 57) …… Control unit (59) …… Failure detector (39) …… Pressure chamber (57) …… Control unit (59) …… Failure detector (70) …… Pressure switch

Claims (1)

[Claims] 1. A shutoff valve disposed between a master cylinder and a wheel cylinder, and a control piston movably provided to open and close the shutoff valve and capable of increasing or decreasing the volume of the shutoff valve on the wheel cylinder side. A pressure chamber into which a pressure that urges the control piston against the pressure on the wheel cylinder side in the direction of opening the shut-off valve is introduced, and a wheel rotation that is provided so as to supply discharge pressure to the pressure chamber. An electromagnetic pump that is driven based on a loading command from a control unit that determines a state, an electromagnetic valve that opens based on a loosening command from the control unit, and connects the pressure chamber to the suction side of the electromagnetic pump, A drive signal is detected until the pressure in the pressure chamber or the discharge side of the electromagnetic pump is detected and this pressure reaches a predetermined pressure for keeping the control piston in the open position of the shutoff valve. A pressure switch that switches to stop outputting the drive signal when the pressure exceeds the predetermined pressure is output, and when the drive signal is output by the pressure switch after the end of the anti-skid control, the drive signal is output according to the drive signal. In an anti-skid control device that drives the electromagnetic pump until the output of a drive signal is stopped, when the brake is not operating, the solenoid valve is used to reduce the pressure in the pressure chamber below the predetermined pressure. A control device for anti-skid provided with a failure detection device which issues a failure signal when a slack command is given for a predetermined time, and then the pressure switch does not switch to stop the output of the drive signal.