JPS5820548A - Fluid pressure controller for anti-skid device - Google Patents

Abstract

PURPOSE:To prevent a kick back phenomenon of a brake pedal, in a device equipped with a reservoir for storing brake fluid discharged from a brake cylinder, by providing a specific valve part in a route where the brake fluid in the reservoir is applied with pressure and returned to a pressure fluid feed pipe line. CONSTITUTION:The captioned device is equipped with fluid pressure control valves 9, 10, controlling brake fluid pressure in accordance with a command from a control unit 38, reservoir 16 temporarily storing discharge pressure fluid from the valves 9, 10, pressure fluid pump 24 forcibly feeding brake fluid in the reservoir 16, accumulator 26, connected to the delivery port of the pump 24 through a pipe line 25, and a valve device 60. This valve device 60 is equipped with the first and second valve parts 54, 73 respectively as a check valve, before delivery pressure of the pump 24 reaches a prescribed value, the both valve parts 54, 73 are placed in a position as shown in the drawing, while after the delivery pressure reaches at least the prescribed value, the first valve part 54 functions as a check valve, and transmission of the delivery pressure to the side of an input port 53 can be prevented at opening of the second valve part 73.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves the smooth condition of wheels of vehicles, etc. :Relates to a liquid pressure control device for an anti-mekid device that controls the brake fluid pressure supplied to the gray medium cylinder of a wheel brake device accordingly.

Conventionally, as a hydraulic pressure control device that controls the brake fluid pressure of a vehicle's brake system, there is a system between a mask cylinder and a brake cylinder of a wheel brake system, in response to a command from a control unit that evaluates the skid state of the wheels. , that gray eight-kling play 1? A hydraulic pressure control valve is installed to control the hydraulic pressure, and when reducing the brake hydraulic pressure, a reservoir is provided to store the brake fluid discharged from the gray medium 7/d via the hydraulic pressure control valve. Japanese Patent Publication No. 49-32494 or Japanese Patent Publication No. 49-32494 discloses a system in which the spray electrolytic liquid discharged into the valve is pressurized by a hydraulic pump and returned to the pressure liquid supply pipe connecting the mask cylinder and the hydraulic pressure control valve. Kosho 53-2
It is known from Publication No. 3914 and the like.

In this type of hydraulic control device, when reducing the brake hydraulic pressure in the brake cylinder, the hydraulic pressure control valve
A hydraulic pump 1 that cuts off communication between a mask cylinder and a player cylinder, discharges brake pressure fluid from a brake cylinder to a reservoir r, and operates the discharged brake fluid at the same time as hydraulic pressure control is started. : Apply more pressure,
The pressure liquid supply pipe C of the mask cylinder is then returned to its original state.

1 = The liquid return action of returning the desired brake fluid to the pressure fluid supply pipe by the hydraulic pump is performed at the same time as the brake pressure fluid is discharged to the gray medium cylinder and the brake fluid supply pipe. In other words, the rounding is performed while the pressure fluid supply line of the master 7 cylinder is shut off by the hydraulic pressure control valve. The gas flows into the generation chamber R, pushes back the actuating piston of the mask cylinder, and thus the foot pedal, causing a phenomenon known as a "kick bar".

In order to prevent this middle pack phenomenon, communication in both directions is allowed until the discharge pressure of the hydraulic pump reaches a predetermined value, and when the cough discharge pressure exceeds the predetermined value, the mask cylinder A check valve that only allows communication from the l The applicant has already proposed a device with a C-type connection for connecting the discharge ports of the same.

However, in the above proposed method C, the discharge port of the hydraulic pump and the mask cylinder are in communication until the discharge pressure of the hydraulic pump reaches a predetermined value f; The pressure liquid pressurized by the pressure pump flows into the mask cylinder's hydraulic pressure generating group C:I? The disadvantage of the occurrence of the rack phenomenon still remains.

The present invention has been made in view of the above-mentioned point 1, and completely prevents the phenomenon of pack-pack inside the brake pedal when the brake fluid discharged into the reservoir is pressurized by the hydraulic pump 2 and returned to the pressure 1 supply pipe. It is an object of the present invention to provide a hydraulic pressure control device for an anti-skid device that can perform the following steps. According to the present invention I, this purpose is to control the brake fluid pressure of the t*brake cylinder by being placed between the master 7 cylinder and the wheel player cylinder, and receiving a command from the control unit F that evaluates the skid state of the wheels. and the control of the cough fluid pressure control valve [: When lowering the brake fluid pressure,
A reservoir for storing brake fluid discharged from the player cylinder via the hydraulic pressure control valve, pressurizing the brake fluid in the reservoir, and connecting the fluid return pipe A to the master cylinder and the hydraulic pressure control valve t. Connecting pressure liquid supply pipe C
; with a hydraulic pump that recirculates liquid.

A connecting portion between the liquid supply pipe and the pressure liquid supply pipe, and the ~
It is installed on the pressure fluid supply pipe side between the hydraulic pump and the cylinder, receives the discharge pressure of the hydraulic pump, and allows communication in both directions until the discharge pressure reaches a predetermined value. When the value exceeds the value, the hydraulic pressure control device for an anti-skid device is equipped with a 41 valve device that only allows communication from the mask cylinder to the hydraulic pressure control valve.
III. The communication between the discharge port of the hydraulic pump and the hydraulic pressure control valve is cut off, and when the discharge loss pressure of the hydraulic pump exceeds the predetermined value C; A hydraulic pressure control device for an anti-skid device, characterized in that a second valve device allowing communication is interposed in the liquid return pipe C;
The details of the present invention will be explained below based on the illustrated embodiment 1.

FIG. 1 shows a piping system diagram for both front wheels of the hydraulic pressure control device for an anti-skid device according to the first embodiment C; illustration of the two rear wheels is omitted because the configuration is almost the same.
In figure R, the mask cylinder (1) has a known construction and is driven by the pedal (Rini) during play.
The first hydraulic pressure generating chamber is connected to a rear wheel piping system similar to the illustrated hydraulic pressure control device via piping (3). A pipe (4) is connected to the dew 2 liquid pressure generation chamber of the master cylinder (1), and this is branched into a pressure liquid return line (6) and a pressure liquid return line (6)...EEl [Supply pipe line] is a valve device 1111, the details of which will be explained later. The hydraulic control valve side pressure liquid supply line (6) is connected to the three-position electromagnetic switching valve (1) via the line (7) and (1).

A hydraulic control valve is configured by the 3-position electromagnetic switching valve (9)■, and each outlet is connected to the front wheel (1
3m) (14m) brake cylinder (13b) (14
b) l: Connected. In addition, each outlet is connected to a pipe (
(to) connection name. The main body with a cylinder hole is forced upward by a relatively weak spring (6), cooled by the seal ring 4, and inserted into the cylinder hole. The piston and the main body form a tin chamber that communicates with the conduit. As will be explained later, the playing cylinder ttab]t
The liquid during play discharged from ab) through pipe 1I (2) is temporarily stored in the recovery chamber R of the tin bath.

The pipe line (2) is connected to the suction port C of the hydraulic pump 4 which is driven by the pipe 1 ml i; The ayamu lator H is connected to the valve device, which will be described in detail at the rear end. : Therefore, it is sealed and the cylinder hole 1t
1 (: consists of a piston fitting that is slidably inserted between the piston ($η and the main body).

A pressure storage chamber communicating with the conduit through the opening is formed. When the pressure transmitted to the opening exceeds a predetermined value (for example, 1504z), the reservoir force moves downward against the spring caused by the piston. The above-mentioned pressure liquid return pipe (
6) l:: Soling during Fi play t3b) (x4
b) to the mask cylinder (1) are connected to the reverse valve @4-, which are connected to the front wheel (13), respectively.
m) (14m) brake cylinder (13b) (14b
) r: 1li-, front wheel (13a) C14m)”
c is a wheel speed sensor to detect these rotational speeds.
A control unit 1 is provided, and these outputs are supplied to a control unit. This control
Enitto is equipped with a known circuit configuration, and the wheel speed sensor
In response to the output of ■, r7'J, wheel speed, deceleration, acceleration k
.

The slip ratio and the like are calculated, and based on these calculation results, hydraulic control valve control signals 8m and 8b are generated.

These control signals 3m and 8b are respectively 3-position electromagnetic switching valves (9) (10M): / V / (Y (9
1) (101) t; supply it L, b, 3-position solenoid switching valve (9) Q□ is its renoid (91) (101
) The magnitude of the voltage of the control signal 8a Th8b supplied to the control signal 8a Th8b is therefore configured to take any one of the three positions A, B, and C. That is, the control signals 8m, 8
When the voltage at b is 00, that is, when no voltage is applied, the key is in the first position, which is the brake applied position. In this position, the mask cylinder (1) side and the brake cylinders (13b) (14b) 1g are in communication state 1:
When the voltage of the control signals 8m and 8b is set to ``4'', Shuji takes the second position B as the brake holding position, that is, when the gray medium holding signal is generated. , 1 State C that cuts off the communication between the cylinder (1) and the cylinder (r3b) and the playing cylinder (13b) (14b) and the side of the cylinder (r3b): placed .front,
When the control signal 8m, 8b () is generated when the electric IFE has a magnitude of @l'', that is, a brake release signal is generated, the 30th device C is set as the brake release position.In this position, the brake release position is set. (1) There is a state of isolation between the cylinder and the brake cylinder (13b) (14b) side,
717 (tab) (ta)
b) Lit IJ f-/< 0111 to
The brake pressure fluid in 4b) is in the reservoir @ g: pipe l! (2)
It is discharged after passing.

From the control circuit, a drive signal 8 is supplied to the motor M1, which is generated when any one of the control signals S and Sb is turned on. This drive signal S is -
C so that if it occurs, it will continue during anti-skid control.
;It is configured.

Next C pressure liquid supply pipe (5) r - Valve device III to be installed
C will be explained in detail. .

The valve body of this valve device consists of a first valve body and a second valve body, each having a stepped through hole.

These valve bodies Is@tn are integrated by the bolt 11".The stepped through hole of the first valve body is 4% of the clinder hole.
The stepped through hole of the second valve body consists of 7 cylinder holes. The opening end of the cylinder hole 44140 of the first valve body is the lid member portion C;
The open end of the cylinder hole of the second valve body (4@) is closed through the lid member fill i;
occluded through silk. An input flow is formed on the upper wall C of the first valve body, and is connected to the pressure fluid supply pipe (5) on the side of the master cylinder (1). Also, on the lower wall of the rattan valve body III is the output RO I! A hydraulic pump pressure supply row is formed, and an output row I: is a hydraulic pressure control valve (9) 0
The pressure liquid supply pipe (5) on the side 1) is connected. The hydraulic pump pressure supply port (@4 is connected to the electric line 1111 and communicates with the hydraulic pump pressure supply port [; through the pipe line.
2 Valve body-〇The lower wall has a hydraulic bong pressure supply port σq and a hydraulic pump pressure transmission p'1.1? @ is formed, and the *pressure pump pressure supply port n1: is connected to the first WL return conduit σ field, which is delayed to the discharge port of the hydraulic bongou via the conduit. Further, the hydraulic pump pressure transmission port n1 is connected to the second m return pipe, which is connected to the hydraulic control valve (I) via the check valve ring.
I) Connected to the pressure liquid supply pipe (5) on the Ql side.

In the first valve body, 1% + Il, the first valve part 2 is configured as a reverse, stop valve - it is arranged in the cylinder hole t4a and is attached to the right side of the nine-ball valve. The valve body 1 consists of a valve seat formed as a tapered step between the cylinder bores 141 and 141. On the other hand, the second valve body 1
A second valve part ffl is configured as a check valve inside the cylinder hole S: a nine-ball valve H, and a valve spring t7 that biases this ball valve ff4 to the left C: The valve seat 1 is formed as a tapered step between the valve seat 1 and the cylinder hole 141.

Cylinder hole t41! 44141 t: The first stepped piston can slide C: It is fitted, and its middle diameter part (58
In b), the cylinder hole (4) is cooled by the round member circle, and the large diameter part (58a) of the seal member tss
t: 7 ring hole 141 (:, it is removed and sealed. Therefore, the small passage part (58c) of the 1M1 stepped piston circle
The circumferential feeling of the pressure liquid chamber (1) is formed, and the pressure liquid chamber (1) is delayed with 5 shocks at the input port (inside the cylinder hole 6); A mouth and a slowing chamber are formed.

In addition, the cylinder hole -n 1411: is slidably fitted with a two-stage piston pair, and its middle diameter portion (68b)
The sealing member 161 is sealed against the cylinder hole. Therefore, the small diameter portion (68
A chamber (1@) communicating with the hydraulic pump pressure transmission port 11@ is formed around C), and a large diameter portion (
681) and around the middle diameter portion (68b), an atmospheric chamber communicating with the ventilation hole is formed.

The inside of the cylinder hole C is provided with a spring 1 to force the second stepped piston to the left in Figure C. and the large diameter part (68 m) of the second stage piston contact, and normally, as shown in the figure, the large diameter part (58 m) of the first stage piston part is the shoulder part between part of the 7-rim hole. This is in line with the ff rumors. In this way, the backward movement position of the first and II2 stepped pistons is regulated. The ball valve is brought into contact with the ball valve of the valve, and the ball valve is moved away from the valve seat against the force of the valve springing force.

On the other hand 1. The small diameter portion (68c) of the second staged piston 4 is separated from the ball valve (2) of the second valve portion 1 at its backward movement position g; C:
Valve seat ffl'g: Seated.

The hydraulic pressure control device according to the embodiment of the present invention is as described above.
Firstly, this effect C: will be explained.

Now, assume that a car equipped with this hydraulic pressure control device is traveling at a constant speed and the brake pedal is depressed.

Start pressing down on the brake pedal (2) at Cm.

The control unit still cannot obtain a deceleration signal or a slip signal, and the control signals 8a and 8b are 0.
3-position electromagnetic switching valve (9) 00 is in the play middle position, and the valve device is also as shown in the figure, so the gray medium liquid from the master cylinder (1) is routed through the pipe (5) to the valve scissors. Place - 〇 person Karow, Pressure * 1iitn, Kurinda Koto.

Output low, pipe line (5) (7) (11) and switching valve (
9) The brake cylinders (13b) (14b) of the wheels tt3m) (t4a) are swept through Ql) - the resulting wheels (13m) (14a) g; ) (14m) is the predetermined deceleration speed f
When I- reaches the slip rate, the control unit ts@ generates a control signal Sa, %.
) (101) 1: Supplied and the position of the switching valve (9)a is switched.

Now, in order to simplify the explanation, consider the case where the control signals 8a%sb are both t= @i''C:, and the switching valve (
9) GO is switched to play life slack position Cr-.

As a result, the fluid communication between the mask cylinder (1) and the plagin cylinder (13b) (tab) is cut off, and the brake cylinder (13b) (14b) and the reservoir (side) are connected to the pipe line. communicated via.

On the other hand, for the hydraulic pump, either one of the control signals 8a and 8b of the control unit is 1P or ''l''.
C: Then, the drive signal 8 is supplied to the motor.

Motor I! It starts to be driven by lr-. Therefore, the brake cylinder (13b) (
14b), the brake fluid discharged from the hydraulic pump-C
Therefore, she is sent to Kanji Ren.

Therefore, the discharge pressure of the hydraulic bongoo is Akie Emulator H (D
Save IE ML II c addition, tareru a (;, change)
The pipe 5et is connected to the hydraulic pump pressure supply port through the first W
i, hydraulic pump pressure supply port n1: applied via return line σ-.

Valve system connected to hydraulic bong I voice supply low - chamber inside the chamber -
The hydraulic pressure decreases and increases when the hydraulic pump ■ starts driving.

Press the large diameter part (58m) of the first stage piston to the right in the figure, and the fluid pressure between the pressure fluid chambers also increases as the pressure pedal (2) is depressed. Press the middle diameter part (58b) of the single-stage piston to the right in the figure. When the sum of these pushing forces to the right overcomes the auxiliary force C of spring (2), the first stage piston moves to the right in Figure C, and the ball valve of the first valve part moves to the valve seat. -5: At the same time as it becomes possible to seat, the small diameter part (68C) of the second stage piston is fixed to the 1s2 valve part (71 (2) ball valve (14t-valve c: h ff1I)
C Push it to the right in the figure against resistance. This causes the ball valve 114 to leave the valve seat (2).

That is, until the discharge pressure of the hydraulic pump reaches a predetermined pressure after the start of driving, the first valve part 4 and the second valve part ffl of the valve device are in the illustrated state 11c. Bidirectional O
The communication pipe is allowed, and the second valve Iln blocks communication between the first liquid return pipe σ and the second liquid return pipe 1. In addition,
2nd liquid return pipe @ 彎内 C: Since the check valve 儂υ is provided, the liquid pressure from the output of the valve device Is@ is the ball valve ff4 of the second valve part 1. Since it is never added to
Although the second valve portion ffl is configured as a check valve, it does not need to function as a normal check valve.

Therefore, until the discharge pressure of the hydraulic pump reaches a predetermined pressure, the pressure supply pipe for this discharge pressure (
S), that is, transmission to the output signal is blocked. In other words, the discharge pressure of the hydraulic pump is 6;
1) The middle-pack pack effect is prevented. When the discharge pressure of the hydraulic pump (incorporated) exceeds a predetermined pressure, the first valve part 1 functions as a check valve, so the second valve part 1 opens and the hydraulic pump (incorporated) Even if the discharge pressure of 2 is applied to the output circle, it will not be transmitted to the input low side cFs, that is, it will not give a kickback effect to the mask cylinder (1).

When the vehicle reaches the desired running speed *1= or stops, the depression on the brake pedal body is released. Then, the hydraulic pressure of the mask cylinder (1) during play decreases to zero, and at the same time, brake fluid flows from the brake cylinders (13b) (14b) to the pipe Q1a% check valve $4! The liquid is returned to the master cylinder (1) through the cylinder and pressure liquid return line (6). On the other hand, when the rightward pressing force of the 5g1 stepped piston @4 becomes smaller than the urging force of the spring ffl, the 1st stepped piston - and the 2nd stepped piston (- indicates Figure C) move to the left. , when the first valve part lI4 is removed from the ball valve-valve seat guide, the second valve part tys is closed.

Therefore, even if the hydraulic pump is still being driven at this time, the output pressure is prevented from being transmitted.

1st valve part @ 40 ball valve (After the seagull leaves the valve seat ■, the brake fluid in the brake cylinders (13b) (14b)
The liquid also flows back to the mask cylinder (1) through the hydraulic pressure control valve (9), the pressure liquid supply pipe (5), and the first valve part. Therefore, the pressure liquid return line (6) (':, interposed check valve --
Player cylinder (tab) Cta below one valve opening pressure
Even if the brake fluid pressure in b) decreases and the brake fluid cannot flow back through the pressure fluid return pipe (6),
The hydraulic pressure can be returned to the mask cylinder (1) through the control valve (9) and the first valve part. Therefore, the brake fluid is recirculated to the master cylinder (13b) (14b) until the brake fluid reaches a complete C level without any residual pressure remaining.

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

For example, in the above embodiment, the first valve part 1 and the second valve part 1 are configured in one valve device, but they may be configured as separate valve devices. As an example, in the first valve part rsa g2, the shape of the valve body is slightly different from that of the example, and the lid member is newly used, but it is completely the same as the example. , corresponding parts are given the same reference numerals. On the other hand, in the second valve part fflC, the valve body-chamber (e-) and the second stepped piston (the shape of i is used as in the embodiment). The other parts are completely the same as those in the embodiment; C; corresponding parts are denoted by the same reference numerals.

In this modification, the first valve part (2) performs exactly the same function as in the embodiment, but the second valve part (2) performs a slightly different function. In other words, in the example, the second stage E stone III right side I
:The valve pressing force is the middle diameter of the fifth stage piston III.
8b) r - Pressure of the working pressure liquid chamber - that is, the master flinder (1) tJ hydraulic pressure and the large diameter part of the first stage piston (58 m) E: Working chamber + 810 hydraulic pressure force, that is, the hydraulic pump -〇Discharge pressure, but in the modified example, the sword that presses the second stage piston +i to the right is the large diameter portion C68'a of the second stage piston 4) t: Acting hydraulic pressure of 1 ksi , that is, only the discharge pressure of the hydraulic pump.

However, since the pressure receiving area of the large diameter portion (s8'a) is larger than that of the embodiment, substantially the same effect as the embodiment can be obtained.

That is, when the discharge pressure of the hydraulic pump is equal to or higher than a predetermined value 6:
Then, the second valve part ffl opens, but in both cases, at the same time as the first valve part comes to function as a check valve.

Or after that, C iris 2 valve parts (11 are opened. 1 is required.

As described above, in the hydraulic pressure control device for an anti-slip device of the present invention, in addition to the first valve device cut off the
When the discharge pressure of the hydraulic pump is equal to or higher than a predetermined value at which the first valve device starts to function as a check, a second valve that allows communication between the discharge port marked # and the hydraulic pressure control valve; 1 device
1! Return pipe C: Since this pipe is provided, it is possible to completely prevent the dropback phenomenon during anti-spring control.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a piping system diagram of a hydraulic pressure control device for an anti-slip system according to an embodiment of the VSO of the present invention, and Fig. 2 shows a modification of the same embodiment. FIG. Note that Figure e: Set aside. (1)・・・・・・・・・・・・・・・・・・・・・
...Tandem master cylinder (5)...
・・・・・・・・・・・・・・・・・・・・・・・・
・・Pressure liquid supply pipe (9) So・・・・・・・・−・
・・・・・・・・・3 position solenoid switching valve' (J empty b)
(14b)・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・Suzu-pa (Foundation)・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・Hydraulic pump－・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・Control Et m4------
−°−−−−−−−、−、、、・・・・・・・・・1st
Benbegato...Shienkyoku...Song...Kyuben 1!
１・・・・・・・・・・・・・・・・・・・・・River...
Valve seat -・・・・・・・・・・・・・・・・・・
・・・・Song・2nd stage piston・・・・・・・・・・
Four walls...concave bend/valve device lll1...
・・・・・・・・・・・・1 song 2nd stage piston I...
・・・・・・・・・・・・・・・Shikai song/tsz dialect 5f
f4...Four surrounding music/Four surrounding curved ball valve-...Four surrounding...Song/Benza agent Yasuo Iisaka

Claims (1)

[Claims] A hydraulic pressure control valve is disposed between the mask cylinder and the wheel play center cylinder and controls the brake fluid pressure of the brake cylinder in response to a command from a control unit that evaluates the skid shape of the wheel. When reducing the brake fluid pressure by controlling the fluid pressure control valve, a reservoir for storing player fluid discharged from the gray medium cylinder via the fluid pressure control valve, and an armpit-At) pressurizing the gray aP fluid are provided. , a pressure wave supply pipe r connecting the mask cylinder/clamp and the hydraulic pressure control valve through a liquid return pipe, a hydraulic pump flowing through 11R, and a connection between the liquid return pipe #i and the pressure liquid supply pipe. A 0IEIIK supply pipe is interposed between the connection part and the master ring, and receives the discharge pressure of the hydraulic pump.
゛Communication in both directions e until the discharge pressure reaches the predetermined OII level.
t'r, the discharge pressure is equal to or higher than a predetermined value. In the pressure control device, the communication between the discharge port of the pre-screaming hydraulic pump and the a-pressure control valve is usually cut off. 1. When the delivery pressure of the hydraulic pump exceeds the predetermined value, the 9. A hydraulic pressure control device for an anti-slip system, characterized in that a second valve device that allows communication between a discharge port and the hydraulic pressure control valve is interposed in the liquid return pipe.