JPS6212452A - Antiskid brake controller - Google Patents

Abstract

PURPOSE:To aim at the prolongation of service life in a feeder, by detecting a fact that a liquid storage in a liquid storage device runs out and controlling an operating stop of the feeder performing a resupply of working liquid, in case of a device which stores the working liquid in the liquid storage device in a following pipe line where the working liquid at the side of a wheel cylinder is discharged. CONSTITUTION:A device bearing the above caption installs a selector valve gear 4 interposingly in each of pipe lines 3 and 5 connecting one side hydraulic pressure generating chamber of tandem master cylinders 1 to a wheel cylinder for front wheels 6, and this valve gear 4 is connected to a reservoir 9 via a pipe line 8. And, a hydraulic pump 10 driven by a motor 10 and a solenoid valve 12 are set up in a pipe line connecting the wheel cylinder to the reservoir 9. The selector valve gear 4 makes a valve ball 16 take a valve seat 17 when a coil 27 is excited at antiskid control, while separates a valve ball 25 from a valve seat 26. At the above-mentioned, when a brake liquid storage inside the reservoir 9 comes to zero, this fact is detected by a switch 64 and the hydraulic pump 10 is controlled so as to be stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an amplifier skid brake control device for a vehicle or the like.

[Prior art and its problems]

As a device of this kind, the applicant first installed a piping system that connects the master cylinder and the wheel cylinder so that it operates in response to commands from a discrimination device that monitors the behavior of a single wheel.
a cutoff valve device that cuts off communication between the master cylinder and the wheel cylinder; a release valve device that can discharge the wheel cylinder side working fluid of the cutoff valve device to a secondary pipe; and a supply device that can pressurize hydraulic fluid and re-supply it to the wheel cylinder, and the hydraulic fluid discharged to the secondary conduit is stored in a variable volume liquid storage device. A control device was proposed.

However, in the above device, the pump serving as the supply device is always driven during anti-skid control.

Therefore, the life of the pump is shortened.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an anti-skid brake control device that extends the life of a pump, that is, a supply device.

[Means for solving problems]

The above object is achieved by the anti-skid brake control device having the above configuration, which detects the presence or absence of a liquid storage amount in the liquid storage device, and prohibits the operation of the supply device when there is no liquid storage amount.

[For production]

When a brake release command is issued, the shutoff valve device closes and the release valve device opens. This causes brake fluid to be discharged from the wheel cylinder to the fluid storage device. When liquid accumulation is detected, the supply device is activated to enable supply to the wheel cylinder.

When the brake release command disappears and the brake reload command is issued, the supply device supplies brake fluid to the wheel cylinder, and the fluid pressure increases.

When the liquid storage lid of the liquid storage device reaches zero, this is detected and the supply device is stopped. From then on, the hydraulic pressure in the wheel cylinder is kept constant. Alternatively, the hydraulic pressure may be supplied from the master cylinder side.

Conventionally, the supply device continued to operate during anti-skid control even if the amount of stored liquid reached zero, but in the present invention, the supply device is stopped when the amount of stored liquid reaches zero, which reduces the lifespan of the device. It can be made longer.

〔Example〕

Hereinafter, Andes-? according to embodiments of the present invention. The rad brake control device will be explained with reference to the drawings.

In Fig. 1, the anti-skid brake control device is indicated as 6Q as a whole, and hydraulic pressure is supplied from a tandem master cylinder (1).A brake pedal (2) is connected to the tandem master cylinder (IJ). 〇The hydraulic pressure generator is connected to the wheel cylinder of the front wheel (6) via a pipe (3), a switching valve device (4), and a pipe (5).

The other hydraulic pressure generating chamber is connected to the wheel cylinder of the rear wheel through a pipe (7) and a valve device similar to that shown.

The cut-off valve device (4) is further connected to the reservoir (
9). Further, a hydraulic pump and a solenoid valve (b) are arranged in the pipe connecting the wheel cylinder of the front wheel (6) and the reservoir (9). Hydraulic pump QQ is motor σ
driven by η.

Next, details of the switching valve device (4) will be explained.

A stepped hole is formed in the main body (to) in the vertical direction, and a master cylinder royal hole is formed in the lower hole, which valves the through hole (A) and is connected to the pipe (3). . In addition, a valve ball (6) is disposed inside this royal seat α and is biased downward by a spring (T), and in the normal state shown in the figure, it is placed at a predetermined distance from the valve seat αη as the stepped part of the stepped hole. I'm away from my seat.

A plunger (toward) is fitted into the center of the stepped through hole so as to be slidable in the vertical direction, and is biased upwardly by a spring, and the upper shaft part (18C) is inserted into the small diameter. It is made to protrude upward from the hole (13a). That is, the valve ball (7) is separated from the valve seat (171).The peripheral wall that fits into the hole of the plunger has a plurality of grooves (x8a), and the upper end surface has a radial groove (x8b). ) is formed, thereby connecting the master cylinder pressure chamber α4 and the through hole (2] J in the normal state shown in the figure.
This makes liquid communication easy. Through hole c! A pipe (5) is connected to 11.

A loosening chamber is formed in the lower hole portion of the stepped through hole, and this is connected to the pipe (8) via the through hole. Also, within this loosening chamber G, a valve ball 9 is connected to a spring c! 41, and in the normal state shown in the figure, it is seated on the valve seat (2) as the stepped portion of the stepped hole.

The lower shaft part (18d) of the plunger (t) has a small diameter hole part (t
3b), in the normal illustrated state, a predetermined distance t
.

The valve ball (251) is opposite to the valve ball (251). This distance t is larger than the above-mentioned predetermined distance t. Therefore, when the plunger moves downward, it first faces the valve ball (251) above.
4) is seated on the valve seat αη, and then the lower shaft portion (18d
) is configured to push down the valve ball □□□ and remove it from the valve seat (2). Upper shaft part of plunger a barrel (l
SC) and the length of the lower shaft portion (18d) are selected with this in mind.

A coil (2) is also wound around the peripheral wall of the main body (to), and when this is excited, a plunger made of a magnetic material is attracted downward by the magnetic force against the spring force of spring 4. Ru. In other words, move downward and close the upper valve ball QQ,
Open the lower valve ball C251. Others @ (to) are seal rings.

The control unit ■ performs various calculations and judgments based on the output of the wheel speed detector supplied to the input terminal 6υ, and generates a brake release signal and a reload signal. When the brake release signal is generated, the control unit (2) Output S in the electric line 511 connected to.

becomes a high level @l''. Also, when the reload signal is generated, the output S on the line 6z becomes a high level @1', but the output S on the line 53 becomes a high level @1' at the input terminal (9a) from the reservoir (9). As long as the input voltage is at the high level "l", the output S at the electric circuit (9) becomes 11'', but when the input voltage goes to the low level "θ", it becomes "O" again.

Next, details of the reservoir (9) will be explained.

A stepped hole is formed in the main body view, and a piston 6η fitted with a sealing member 68 is slidably fitted into this large diameter hole. As a result, a brake fluid storage chamber (651) communicating with the through hole is defined on the right side, and an air chamber (66) is defined on the left side.The piston 6η is relatively weak, but the sealing member 58
The sliding resistance of No. 1 is biased to the right by a spring 69 having a large spring force, and the brake fluid is in the normal state shown in the figure, that is, when the brake fluid storage volume is zero. It is in contact with the inner end wall of the main body t541.

A sensor piston 1601 with a T-shaped cross section is disposed at a predetermined distance from the shaft-like part (57a) of the piston mark, and the spring holder is attached to the right side by a spring 61J stretched between -. The rightward position is regulated by the head (60a) coming into contact with the stepped portion of the stepped hole ω.

The sensor piston is slidably fitted into the inner hole of the spring receiver, and faces the contact point in the switch diagram at a predetermined distance. (6 pieces are insulating materials.

The brake fluid flows into the reservoir, the piston 57 moves to the left, and when the sensor piston l601 is pressed, the switch closes and the output I from now on becomes "l". ing. As mentioned above, the switch (64
The output terminal (9a) of No. 1 is connected to the control unit ■.

Output S, is @l#, coil - is excited, output 5I-8
, is 12, the solenoid (X2a) of the electromagnetic valve □□□ is excited, and the motor Qυ is driven. The solenoid valve (6) takes the state A when the solenoid (i2a) is not energized, and cuts off the wheel cylinder side of the wheel (6) and the hydraulic pump aq side, but the solenoid (12a) is energized. and state B, and communicate them.

The embodiment of the present invention is constructed as described above, and its operation will be explained next.

It is now assumed that a vehicle equipped with the present control device 1501 and the master cylinder (11) is running at a constant speed.

Output signals S1, S2, and S are all 10#, and each part of device I5I is in the state shown. It is now assumed that the brake pedal (2) is fully depressed to stop the vehicle.

Pressure fluid from the master cylinder (1) passes through the pipe (3), the pressure chamber α of the switching valve device (4), the through hole circle, and the pipe (5), and is supplied to the wheel cylinder of the car (6). . In addition,
Although not shown, pressurized fluid is also supplied to the wheel cylinder of the rear wheel by valving the piping (7) and a device similar to the device shown in the figure (51). Although the other front wheel is not shown, it is assumed that it is connected in parallel to the pipe (5).

Since the coil (2) of the switching valve device (4) is not energized yet, the plunger (g) and valve ball Ql [with] are in the states shown in the figure, and the piping (3) side and the piping (5) side are However, the piping (5) side and the piping (8) side are cut off. Therefore, the pressure fluid from the master cylinder (4) is supplied to the wheel cylinder of the front wheel (6) through the pressure chamber α of the switching valve device (4) and the through hole (211) as described above.

Note that the hydraulic pressure from the master cylinder (1) acts on the upper surface of the lower valve ball G, but this pressure-receiving area is sufficiently small.
It is assumed that the spring force of spring U is not large enough to open the valve.

As pressurized fluid is supplied to the wheel cylinder of the wheel (6), the brake starts to apply to the single wheel (6).The fluid pressure in the wheel cylinder increases, and at a certain time, if the pressure is too high during play, the control unit Judging by , the output Sl is
1". The coil (8) is thereby excited, a downward attractive force is applied to the plunger (to), and the plunger (to) moves downward against the spring force of the spring α0.

First, the upper shaft portion (lSC) is retracted downward from the small diameter hole portion (X3a), and the valve ball (4) is seated on the valve seat αη. This causes the pressure chamber α rotation, that is, the master cylinder IJ y ta(1
The first side and the wheel cylinder side of the wheel (6) are cut off. Next, the lower shaft portion (18d) comes into contact with the valve ball and pushes it down against the spring force of the spring. As a result, the loosening chamber, that is, the reservoir (9) side and the wheel cylinder side of the wheel (6) are brought into communication. Pressure fluid from the wheel cylinder of the wheel (6) passes through the through hole (211, small diameter hole (13b), and relaxation chamber) and is discharged to the reservoir (9).Therefore, the braking force of the wheel (6) decreases. do.

The storage capacity of the reservoir (9) (within the switching valve device (4)
Pressure fluid discharged from the wheel cylinder flows in through the piston 57 and presses the piston 57 to the left. The sensor piston 601 is pressed by the shaft-like part (57a) of the piston 5'r), and the switch (6J is closed and the outlet is 11#).
becomes.

However, since the brake reload command has not been issued yet, the output S of the control unit remains at 10".
It is. As the pressure liquid flows into the storage field, the piston 6η moves to the left, and the amount of stored liquid increases.

The output of the switch (641 continues for "l").

If the control unit determines that the brake is too loose at a certain time and needs to be reloaded, the output SI
becomes "0#", and the output S,,S, becomes "bi". The motor Oυ rotates and the solenoid (z2a) of the electromagnetic valve (2) is energized. On the other hand, the coil of the switching valve device (4) is de-energized and the plunger (T) moves toward the upper blade by the spring force of the spring 4. The lower valve ball (C) is seated on the valve seat 4, and the wheel cylinder side and the reservoir (9) side are cut off.

- The upper shaft part (18C) of the plunger (T) comes into contact with the valve ball (T) of the upper blade, but the hydraulic pressure in the master cylinder (1) continues to rise even after the above-mentioned brake release starts. 9. Benkyu (
There is a large pressure difference between the upper and lower parts of the lower shaft (18c), and the lower shaft part (18c) will not push up. In other words, the master cylinder (IJ side and wheel cylinder side) are still in a disconnected state. Therefore, if the output S of the control unit (■) is not set to 11" immediately after the end of the brake release signal, is a solenoid valve (
6) Since the condition is , the hydraulic pressure in the wheel cylinder can be immediately maintained constant.

As the outputs S1, S, become "l', the solenoid valve (b) enters the state of B, and the hydraulic pump QO sucks brake fluid from the reservoir (9) and pumps it into the wheel cylinder. By supplying fluid, the braking force of the wheels (6) increases.

As the brake fluid flows out from the reservoir (9), the piston mark moves to the right, and when the amount of stored fluid reaches zero and comes into contact with the inner end wall of the main body 5, the switch opens and the piston mark moves to the right. The crab becomes 10". As a result, the output Ss of the control unit (2) becomes @0" and the drive of the hydraulic pump GO is stopped. After this, the hydraulic pressure in the wheel cylinder becomes constant (the valve ball (g) of the switching valve device (4) is closed due to the differential pressure). Note that when the output S becomes "0", the S
l may also be set to "0". Also, the reservoir (
9), the shaft-shaped portion (57a) of the piston (57) is the sensor piston 11! : After the piston 157) is separated, that is, after the switch +641 is opened, the main body (541
Although there is a slight movement distance before it comes into contact with the inner end wall (54a) of the motor, the inertia of the motor ση makes it possible to sufficiently suck in this amount of stored liquid. However, in some cases, a delay timer may be used to delay the time from when the switch is opened until the displacement signal S to the motor (6) reaches "0#."

Alternatively, the shaft portion (57a) of the piston 67) may be brought into contact with the seventh sensor piston peak in advance when the amount of liquid stored is zero (however, the tip portion of the sensor piston group may be brought into contact with the tip portion of the sensor piston group within the switch (64)). (Ignore the distance to the contact point).

When a command to release the brake is issued while the hydraulic pressure in the wheel cylinder is constant, the above-described operation is repeated.

Although the wheels (6) are prevented from locking in the above manner, this embodiment has the following effects.

That is, when the amount of brake fluid stored in the reservoir (9) becomes zero, the driving of the hydraulic pump αq is stopped. Therefore, compared to a conventional device in which the motor Oυ and the hydraulic pump OQk are constantly driven during control, the lifespan of these can be extended.

The embodiments of the present invention have been described above, but of course the present invention is not limited thereto, and various modifications can be made based on the technical idea of the present invention.

Further, in the above-described embodiment, a motor-driven hydraulic pump is used, but an electromagnetic coil-driven type as shown in FIG. 2 may be used instead. In FIG. 2, the hydraulic pump is shown as a whole by (126), and a coil (150) wound around a bobbin (149) is arranged and fixed in the lower part of the inner hole of this device body (148). Bobbin (149
) A plunger (151) made of a magnetic material is slidably fitted into the center hole of the plunger (151) via a sleeve (146). The coil (150) is connected to the electric line (159) (the electric line of the above embodiment).
The plunger (151) is energized by a current from the body (148
is in contact with the bottom (448a) of.

A seal ring (154) is attached to the small diameter part of the inner hole of the main body (148).
) of the plunger (151,).
2) is slidably fitted and then the spring (155) urges the plunger (1st) y2 body (1
48) is brought into contact with the bottom (t4sa). In the normal state shown, the small diameter part (152) of the plunger (15t)
A liquid chamber (156) with a predetermined volume (for example, 0.1 cc) is formed between the liquid chamber (156) and the upper end surface (148b) of the inner wall of the main body (148), and this liquid chamber (156) communicates with the discharge port (127). coil(
150) 'i When excited, the plunger (151) is urged against the upper blade by magnetic attraction, and its upper end surface is pressed against the main body (1
48) and stops when it comes into contact with the upper end surface (148b) of the inner wall, and the previous stroke sends a predetermined volume of hydraulic fluid to the wheel cylinder side via the check valve (125) and the pipe (124)'.

Due to the restoring force of the thorn (155) when the coil (150) is de-energized, the plunger (151) moves downward and takes the position tt- shown in the figure. The return stroke at this time causes the pipe line (
122) and check valve (123)? A predetermined volume of hydraulic fluid is sucked in from the reservoir side through the reservoir. It is assumed that a magnetic circuit is constituted by the plunger (151) made of a magnetic material and a part of the main body (148).

The electric line (159) has a signal S from the O-le unit.
is supplied, but periodically ``''l#, ``0#, @1'',
A pulse-like signal that repeats...
When the amount of liquid stored in the reservoir reaches zero, it will continue to be “0”.
”.

It is clear that the above-mentioned advantages can also be obtained with the hydraulic pressure supply device as described above.

Furthermore, in the above embodiments, the switching valve device (4) uses a valve body and a valve ball, which is opened and closed by a plunger, but a spool valve may be used instead. As the plunger (G) moves downward, the master cylinder side and the wheel cylinder side are cut off, the wheel cylinder side and the reservoir side are cut off, and then the master cylinder side and the wheel cylinder side are cut off, and the wheel cylinder side is cut off. It is possible to establish communication between the cylinder side and the reservoir side. Also, the plunger (to)
As it moves upward, the master cylinder side and the wheel cylinder side are disconnected, and the wheel cylinder side and the reservoir side are disconnected. The state of disconnection with the side can make you take money. When using a spool valve, the plunger moves to the upper return position as the coil surface is de-energized, and the difference between the master cylinder side and the wheel cylinder side 1 is caused by the differential pressure between the master cylinder side and the wheel cylinder side. Also, the state of being cut off between the wheel cylinder side and the reservoir side is never maintained. Therefore, the master cylinder (17
It also becomes possible to supply brake fluid for refilling.

Furthermore, in the above embodiment, the liquid i is stored in the reservoir (9).
To detect tt, a sensor piston (601) opposite the piston 157) and a switch were used.
Instead of this, the piston 157) is connected to the inner end wall of the main body 541 (
54a) may be detected by some means. For example, a switch with a slightly protruding actuator may be provided on the inner end wall (54a).

Of course, in this case, the amount of liquid stored is zero and the switch actuator is pressed, so the output I from the switch is @l when it is not pressed.
All switch circuits should be configured so that #.

Alternatively, a cam switch or a limit switch is provided on the inner circumferential wall of the main body t541, that is, the wall on which the piston (5η) slides, and when the piston 5η starts moving leftward from the illustrated position where the amount of liquid stored is zero, this switch may be closed.

〔Effect of the invention〕

As described above, according to the anti-skid brake control device of the present invention, the life of the supply device for re-increasing the hydraulic pressure to the wheel cylinder can be extended longer than in the conventional art.

[Brief explanation of drawings]

FIG. 1 is a piping and wiring system diagram of an anti-skid brake control device according to an embodiment of the present invention, and FIG. 2 is a vertical cross-section of an electromagnetic coil type pump showing a modification of the hydraulic pump as a supply device in FIG. 1. It is a diagram. In the figure,

Claims (1)

[Claims] A shutoff valve device that cuts off communication between the master cylinder and the wheel cylinder so as to be operated in response to a command from a discrimination device that monitors the behavior of the wheel, in a piping system that connects the master cylinder and the wheel cylinder; a release valve device capable of discharging the working fluid on the wheel cylinder side of the shutoff valve device to a secondary conduit; and a supply device capable of pressurizing the hydraulic fluid discharged to the secondary conduit and resupplying it to the wheel cylinder. In the anti-skid brake control device, the hydraulic fluid discharged into the secondary pipe is stored in a variable volume liquid storage device, which detects the presence or absence of a liquid storage amount in the liquid storage device, and , an anti-skid brake control device that prohibits the operation of the supply device when the supply device is not present.