JPH07246921A - Hydraulic operation valve in brake controller for vehicle - Google Patents

Abstract

PURPOSE:To effectively suppress the occurrence of pulsation of brake liquid pressure transmitted to a break pedal or noise caused by this pulsation. CONSTITUTION:The first valve mechanism 26 of normal open type, which opens and closes brake passages I and II, is incorporated in a piston 23, and also the second valve mechanism 27 of normal close type, which opens and closes the passage between an auxiliary pressure device and a master cylinder, is incorporated between the piston 23 and the bottom of a cylinder 22. The shock to hydraulic pressure to the master cylinder is hindered from being transmitted by closing the first valve mechanism 26 at operation of the auxiliary pressure device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake control device having an anti-lock control function (ABS) for preventing wheel slip during braking, and more particularly, it can improve the brake feeling during ABS operation. The present invention relates to a hydraulically operated valve in a vehicle brake control device.

[Prior art]

In this type of brake control device, a master cylinder and each wheel cylinder are connected by two systems of brake flow paths, and a normally open solenoid valve is provided on the inlet side of each wheel cylinder of each brake flow path. The inlet valve is installed, and the outlet valve, which is a normally-closed electromagnetic valve, is installed on the way of the return flow path connecting each wheel cylinder and the reservoir. In addition, an auxiliary pressure device (motor and hydraulic pump) is installed in the return channel via a check valve,
During normal braking, liquid is supplied to the wheel cylinders via the brake flow path to brake, and during ABS operation in which the wheels tend to slip, intermittent operation to the wheel cylinders by the auxiliary pressure device and inlet / outlet valves The electric pressure of each wheel is appropriately controlled by the electric opening / closing control of the wheel so that the slip of the wheel can be suppressed.

[0003]

The above-mentioned conventional brake control technique has the following problems.

<A> During ABS operation, since the main brake flow path connecting between the master cylinder and each wheel cylinder communicates with each other, the discharge pressure from the auxiliary pressure device is transmitted to the brake pedal as pulsation through the master cylinder. , The pulsation is transmitted to the driver who is stepping on the brake pedal, and the brake feeling is bad.

<B> The impact generated by the intermittent operation of the auxiliary pressure device or the impact generated when the solenoid valve constituting the inlet / outlet valve is closed is attached to the fire pipe (wall material attached to the brake pipe or the master cylinder. ) And noise is generated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a brake control device capable of effectively suppressing generation of pulsation and noise transmitted to a brake pedal. To provide a hydraulically actuated valve.

[0007]

According to the present invention, an auxiliary pressure device for generating pump pressure liquid, two systems of brake flow passages connecting a master cylinder and wheel cylinders, and a brake flow passage are provided on the way. Equipped with a normally open type inlet valve and a normally closed type outlet valve interposed on the way of the return flow path connecting each wheel cylinder and the auxiliary pressure device, and the auxiliary pressure device if the wheel shows a slip tendency. The brake flow that connects the master cylinder and the wheel cylinder in the vehicle brake control device that controls the hydraulic pressure of each wheel cylinder by opening and closing the inlet valve and the outlet valve while supplying pressure fluid to the brake flow path. A hydraulically actuated valve inserted on the way of the road, which is supplied from an auxiliary pressure device and a normally open first valve mechanism that opens and closes a brake flow path by a pressure difference between a master cylinder and a wheel cylinder. A hydraulically actuated valve in a vehicle brake control device, comprising a normally closed second valve mechanism that opens and closes between a return flow passage and a brake flow passage by a pump pressure and a pressure difference between a master cylinder. is there.

Further, according to the present invention, an auxiliary pressure device for generating a pump pressure liquid, two systems of brake flow passages connecting between the master cylinder and each wheel cylinder, and a normally open inlet provided on the way of the brake flow passages. A valve and a normally-closed outlet valve provided on the way of the return flow path connecting each wheel cylinder and the auxiliary pressure device are provided, and when the wheel shows a slip tendency, the auxiliary pressure device operates and the brake flow path is provided. In the vehicle brake control device for controlling the hydraulic pressure of each wheel cylinder by opening and closing the inlet valve and the outlet valve while supplying the hydraulic fluid to
A hydraulically actuated valve inserted in the middle of the brake flow passage connecting the master cylinder and the wheel cylinder, wherein the flow passage from the auxiliary pressure device is connected to the bottom surface of the cylinder communicating with the brake flow passage, A tubular piston is slidably accommodated in the piston, and a normally open first valve mechanism that opens and closes the brake flow path by the pressure difference between the master cylinder and the wheel cylinder during operation of the hydraulic actuator is formed inside the piston. A normally-closed second valve mechanism, which opens and closes between the return flow path and the brake flow path due to the pressure difference between the pump pressure supplied from the auxiliary pressure device and the pressure of the master cylinder, is provided between the piston and the cylinder bottom surface communicating with the auxiliary pressure device. It is a hydraulically operated valve in a vehicle brake control device characterized by being formed.

Further, according to the present invention, an auxiliary pressure device for generating a pump pressure liquid, two systems of brake flow passages connecting between the master cylinder and each wheel cylinder, and a normally open inlet provided on the way of the brake flow passages. A valve and a normally-closed outlet valve provided on the way of the return flow path connecting each wheel cylinder and the auxiliary pressure device are provided, and when the wheel shows a slip tendency, the auxiliary pressure device operates and the brake flow path is provided. In the vehicle brake control device for controlling the hydraulic pressure of each wheel cylinder by opening and closing the inlet valve and the outlet valve while supplying the hydraulic fluid to
A hydraulically actuated valve that is inserted on the way of the brake flow path connecting the master cylinder and the wheel cylinder.The brake flow path on the master cylinder side, the brake flow path on the wheel cylinder side, and the flow from the auxiliary pressure device A cylindrical piston is slidably accommodated in a cylinder that communicates with the passage, and a large diameter portion of the piston defines the inside of the cylinder and always communicates with the master cylinder. Operation of the hydraulically actuating device by means of an axial passage formed inside the piston, a valve body capable of closing the axial passage, and a spring for urging the valve body in the valve closing direction, each forming a second chamber communicating with the device. The normally open first valve mechanism that blocks the flow path between the master cylinder and the wheel cylinder is formed, and the valve seat on the bottom of the cylinder, the valve element attached to the piston, and the valve element are closed. To the spring that urges A hydraulic pressure in a vehicle brake control device, characterized in that a normally closed second valve mechanism is formed that opens the valve only when the hydraulic pressure actuator is in operation and supplies the hydraulic fluid from the auxiliary pressure device to the wheel cylinder. It is an operating valve.

[0010]

[Embodiment 1] <A> Overall configuration FIGS. 1 to 3 are drawings according to Embodiment 1, and FIG. 1 is a conceptual diagram of a brake control device incorporating a hydraulically actuated valve 20, and FIGS. Shows the hydraulically operated valve 20. In FIG. 1, the master cylinder 10 and the wheel cylinders 11 of the wheels 12 to 15 are connected via independent brake flow paths I and II by a so-called "X piping system". A hydraulically operated valve 20, 20 to be described later and a normally open type inlet valve 16 for each wheel 12-15 are incorporated in the way of each brake flow path I, II, and each wheel 12-15 and auxiliary pressure. A normally-closed outlet valve 17 is incorporated in the return flow passage 30 connecting between the devices (comprising the hydraulic pump 32 and the motor 35), and the wheels 16 and 17 are opened and closed by opening and closing each wheel. The brake pressure of can be controlled.

The inlet valve 16 and the outlet valve 17 are composed of two-position two-way solenoid valves, and a total of eight solenoid valves for these are a rotation speed sensor (not shown) for detecting the rotation speed of each wheel 12-15 and an electronic control. In combination with the unit, when the ABS is operated, power is supplied to each valve from the electronic control unit to open / close the flow path to control the hydraulic pressure reduction / holding pressure / increase of each wheel 12-15. . Since these solenoid valves and control systems are known, their description is omitted.

Further, in explaining the subsequent configuration,
Since the brake flow paths I and II have the same configuration,
One brake flow path I will be described, and description of the other brake flow path II and devices attached to the brake flow path II will be omitted.

A hydraulically operated valve 20 is interposed between the auxiliary pressure device and the brake passage I, and each wheel 12, 13 is provided.
Check valves 33 and 34 that prevent the flow of the liquid to the wheels 12 and 13 are attached to the front and rear flow paths of the hydraulic pump 32. Further, a reservoir 40 is provided on the way of the return flow path 30 so as to accumulate the return liquid at the time of ABS operation and supply the internal storage liquid to the hydraulic pump 32. The hydraulically operated valve 20 opens the brake flow path I during normal braking when the slip tendency of the wheels is not known,
Further, during the ABS operation, the hydraulic fluid from the hydraulic pump 32 can be supplied to the wheel cylinders 11 of the predetermined wheels 12 and 13 in a state where the reverse flow to the master cylinder 10 is blocked.

<B> Hydraulic pressure operating valve The hydraulic pressure operating valve 20 has two valve mechanisms which are opened and closed by hydraulic pressure, and has a valve function of opening and closing the brake flow passage I, a return flow passage 30 and a brake flow passage. Also has a valve function to open and close between I,
In particular, when the pump pressure supplied from the auxiliary pressure device through the return passage 30 and the pressure of the master cylinder reach the set conditions, the pressure fluid in the return passage 30 can be supplied not only to the wheel cylinder but also to the master cylinder. Has become.

The specific structure of the hydraulically operated valve 20 will be described with reference to FIGS. 2 and 3. The hydraulically operated valve 20 has the same body in which the plurality of sets of the inlet valve 16 and the outlet valve 17 are incorporated. It is attached to 21. The hole side surface of the cylinder 22 formed in the body 21 communicates with the brake flow path I, and the hole bottom of the cylinder 22 communicates with the return flow path 30. A cylindrical piston 23 is slidably accommodated in the cylinder 22, and a lid member 24 closes the inlet of the cylinder 22. Large diameter portion 23a of the lid member 24 and the cylinder 22
A coil spring 25 is arranged in a contracted state between the and, and the coil spring 25 pushes the piston 23 toward the inner side of the hole of the cylinder 22.

A seal member 23b is mounted on the peripheral surface of the large diameter portion 23a of the piston 23, and the inside of the cylinder 22 is divided into two upper and lower first and second chambers 22a and 22b. First
The chamber 22a is always in communication with the master cylinder through the brake flow path I, and the second chamber 22b is always in communication with the wheel cylinder through the brake flow path I. The piston 23 has an axial path 23c formed therein, a slit 23d is opened in the upper side surface of the piston 23, and a plurality of arms 23e directed downward are provided in the lower portion of the piston 23.

The hydraulically operated valve 20 contains two valve mechanisms. One of them is the axial path 23c of the piston 23,
There is a normally open first valve mechanism 26 configured by a valve body 23f capable of closing the shaft path 23c, and the other is a valve seat 23g on the bottom surface of the cylinder 23 and a valve body 23h attached to a lower portion of the arm 23e. A normally-closed type consisting of
It is the valve mechanism 27.

The valve body 23f constituting the first valve mechanism 26 is urged in the valve closing direction via the hemispherical pressing body 23i and the spring 28, and the support rod 29a of the valve pushing body 29 fixed to the cylinder 23 serves as a valve. The first valve mechanism 26 is opened by contacting the body 23f. As shown in FIG. 3, the valve pushing body 29 includes a disc 29c having an opening 29b and a support rod 29 provided upright on the disc 29c.
a, the support rod 29a has a diameter that can be inserted into the shaft path 23c, and when the second valve mechanism 27 is closed, the valve body 23f is pushed upward to open the first valve mechanism 26. It is set to the length. As shown in FIG. 2, the disk 29c of the valve pusher 29 is "caulked" on the step inside the cylinder 22.
Or "screw" to fix.

The valve element 23h has an opening 29b in the disk 29c.
The piston 23 is attached to the end of the arm 23e.

[0020]

[Operation]

<A> During normal braking The hydraulic pressure generated in the master cylinder 10 by the driver's braking operation in FIG. 1 is the hydraulic pressure actuated valve 2 interposed between the brake flow paths I and II and the respective brake flow paths I and II.
0, is supplied to the wheel cylinders 11 of the wheels 12 to 15 through the inlet valve 16 and is braked. Further, the return liquid when the brake is released is returned to the master cylinder 10 by the reverse route.

At this time, in the hydraulically operated valve 20 shown in FIG. 2, since no pressure is generated in the return passage 30, the piston 23 receives the spring force of the spring 25 to close the second valve mechanism 27 and close each brake. A valve ball 23f that blocks communication between the flow paths I and II and the return flow path 30 and abuts on the support rod 29a of the valve push body 29.
Separates from the shaft path 23e to open the first valve mechanism 26 to communicate the brake flow paths I and II.

<B> At the time of ABS operation During braking, if some or all of the wheels 12 to 15 tend to slip, the hydraulic pump 32 operates and the pump pressure is supplied to the hydraulic valve 20. Hydraulically operated valve 20
The pump pressure supplied to the valve element 2 acts on the second valve mechanism 27 shown in FIG.
The second valve mechanism 27 is opened by separating 3h from the valve seat 23g. When the piston 23 is further pushed up while the coil spring 25 is contracted by the pump pressure, the valve body 23f
Is seated on the shaft path 23c and closes the first valve mechanism 26 to cut off communication with the master cylinder side. As a result, the pump hydraulic pressure is sent only to the wheel cylinder-side through the second valve mechanism 27.

When the differential pressure between the pump pressure and the master cylinder exceeds the set pressure defined by the downward spring force of the spring 28, the first valve mechanism 26 opens and the pump hydraulic pressure is also sent to the master cylinder side. . In this way, during the ABS operation, the hydraulically operated valve 20 closes the first valve mechanism 26 and shuts off the brake flow paths I and II. In this way, the pulsation caused by the intermittent operation of the pump and the opening / closing operation of the inlet / outlet valves 16 and 17 is blocked by the first valve mechanism 26 to prevent transmission to the master cylinder 10.

[0024]

Second Embodiment FIG. 4 shows another embodiment having a different piping system. The present embodiment is an example in which the wheels 12 to 15 are arranged in a "front and rear piping system (H piping system)". Other configurations and operations of this embodiment are similar to those of the above-described first embodiment,
The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

[0025]

[Third Embodiment] In the above, the case where the invention is applied to the front wheel drive vehicle has been described, but it is of course possible to apply the invention to the rear wheel drive vehicle. In this embodiment, as compared with the first embodiment (FIG. 1) or the second embodiment (FIG. 4), only the connection of the pipes of the wheels 12 to 15 is changed, and the X pipe system or the front and rear pipes It can be applied to any of the methods (H piping method). It is also easy to apply to four-wheel drive vehicles.

[0026]

[Embodiment 4] The case where the present invention is applied to the vehicle brake control device equipped with the ABS has been described. It can also be applied to a brake control device or a vehicle brake control device having both ABS and TCS functions.

[0027]

The hydraulically actuated valve receives the pump pressure during the ABS operation and allows the supply of liquid to the wheel cylinders while blocking the communication with the master cylinder, so that the following effects can be obtained.

<A> Since the pump hydraulic pressure is not transmitted to the master cylinder during ABS operation, the pulsation is not transmitted to the driver and the brake feeling is improved.

<B> Since the hydraulically operated valve shuts off the impact generated when the auxiliary pressure device is intermittently operated or when the inlet / outlet valve is closed, the noise generated due to the vibration of the firewall can be remarkably reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a brake control device incorporating a hydraulically operated valve.

FIG. 2 is a vertical sectional view of a hydraulically operated valve.

FIG. 3 is an explanatory diagram of a valve mechanism that constitutes a hydraulically operated valve.

FIG. 4 is a circuit diagram of a brake control device according to a second embodiment applied to H piping.

[Explanation of symbols]

10 ... Master cylinder, 11 ... Wheel cylinder,
12 to 15 ... Wheels, 16 ... Inlet valve, 17 ... Outlet valve, 20 ... Hydraulically actuated valve, 21 ... Body, 2
2 ... Cylinder, 23 ... Piston, 24 ... Lid,
25 ... coil spring, 26 ... first valve mechanism,
27 ... second valve mechanism, 28 ... spring, 29 ... valve pusher,
30 ... Return channel, 31 ... Auxiliary channel, 32 ... Hydraulic pump, 33, 34 ... Check valve, 35 ... Motor,
40 ... Reservoir

Claims (3)

[Claims] 1. A connection between a master cylinder and each wheel cylinder, and an auxiliary pressure device for generating a pump pressure liquid.
A system brake flow path, a normally open inlet valve installed on the way of the brake flow path, and a normally closed outlet valve installed on the way of the return flow path connecting each wheel cylinder and the auxiliary pressure device. When the wheel shows a slip tendency, the auxiliary pressure device is activated to supply the pressure fluid to the brake flow path, and the inlet valve and the outlet valve are opened and closed to control the fluid pressure of each wheel cylinder. In a brake control device, a hydraulically actuated valve that is inserted on the way of the brake flow passage that connects the master cylinder and the wheel cylinder, and is a normally open valve that opens and closes the brake flow passage by the pressure difference between the master cylinder and the wheel cylinder. It is characterized by comprising a first valve mechanism and a normally-closed second valve mechanism that opens and closes between the return flow passage and the brake flow passage by the pressure difference between the pump pressure supplied from the auxiliary pressure device and the master cylinder. To, hydraulically operated valve in the vehicle brake control system. 2. An auxiliary pressure device for generating a pump pressure liquid, and 2 connecting between a master cylinder and each wheel cylinder.
A system brake flow path, a normally open inlet valve installed on the way of the brake flow path, and a normally closed outlet valve installed on the way of the return flow path connecting each wheel cylinder and the auxiliary pressure device. When the wheel shows a slip tendency, the auxiliary pressure device is activated to supply the pressure fluid to the brake flow path, and the inlet valve and the outlet valve are opened and closed to control the fluid pressure of each wheel cylinder. In a brake control device, a hydraulically operated valve that is inserted in the middle of the brake flow passage that connects the master cylinder and the wheel cylinder, and connects the flow passage from the auxiliary pressure device to the bottom surface of the cylinder that communicates with the brake flow passage. A normally-open first type in which a cylindrical piston is slidably accommodated in the cylinder, and the brake flow path is opened / closed by the pressure difference between the master cylinder and the wheel cylinder when the auxiliary pressure device is in operation.
A valve mechanism is formed inside the piston, and a normally closed second valve mechanism that opens and closes between the return passage and the brake passage by the pressure difference between the pump pressure supplied from the auxiliary pressure device and the master cylinder is used. A hydraulically actuated valve in a vehicle brake control device, characterized in that it is formed between a cylinder bottom surface communicating with the. 3. An auxiliary pressure device for generating a pump pressure liquid, and 2 connecting between the master cylinder and each wheel cylinder.
A system brake flow path, a normally open inlet valve installed on the way of the brake flow path, and a normally closed outlet valve installed on the way of the return flow path connecting each wheel cylinder and the auxiliary pressure device. When the wheel shows a slip tendency, the auxiliary pressure device is activated to supply the pressure fluid to the brake flow path, and the inlet valve and the outlet valve are opened and closed to control the fluid pressure of each wheel cylinder. In a brake control device, a hydraulically actuated valve that is inserted on the way of the brake flow passage that connects the master cylinder and the wheel cylinder, and includes a brake flow passage on the master cylinder side, a brake flow passage on the wheel cylinder side, and an auxiliary valve. A cylindrical piston is slidably housed in a cylinder that communicates with a flow path from the pressure device, and a large diameter portion of the piston defines a inside of the cylinder and a first chamber that communicates with the master cylinder at all times. E The second chamber that communicates with the cylinder and the auxiliary pressure device, and the auxiliary pressure is provided by the shaft formed inside the piston, the valve body that can close the shaft, and the spring that biases the valve body in the valve closing direction. A normally open first valve mechanism that blocks the flow path between the master cylinder and the wheel cylinder only when the device is in operation is formed, and a valve seat on the bottom surface of the cylinder and a valve element attached to the piston are provided.
A normally-closed second valve mechanism is formed in which a spring for urging the valve element in a valve closing direction opens the valve only when the auxiliary pressure device is in operation to supply the pressure liquid of the auxiliary pressure device to the wheel cylinder. A hydraulically actuated valve in a vehicle brake control system.