JPH05505359A - anti-lock hydraulic brake system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] anti-lock hydraulic brake system [Technical field] The invention relates to an anti-lock hydraulic brake system according to the preamble of claim 1. It is something to do.

[Background technology] A brake system of this type is known from US Pat. No. 4.715.666.

In addition to the outlet valve, this system includes another closing valve in the return line. system The return line is closed unless the system is switched to anti-lock mode.

Therefore, the pressure in the master brake cylinder is full to the outlet valve, and at this time the pressure in the master brake cylinder is full to the outlet valve. A throttle is provided between the master brake cylinder and the outlet valve. this The throttle is located in a longitudinal bore that passes through the actuation piston of the closing valve in the return line. It is provided. This slows down the pressure drop. That is, when the outlet valve is actuated , first the working piston moves before the pressure medium is removed from the wheel brake. Must. The pressure medium is separated by a movable piston. propagates within the body accumulation means. The above piston is in contact with the pump piston spring. Ru. Therefore, the pump piston moves and the pressure medium accumulates. The stage must be filled before it abuts the drive eccentric. This is, This means that a rapid re-increase in pressure is possible only with a delay.

[Disclosure of invention] It is therefore an object of the invention to reduce the number of valves and, in particular, to reduce the rapid pressure drop. The goal is to make it possible.

This object is achieved by the measures described in the characterizing part of claim 1.

The pressure at the pump outlet switches the throttle valve. At this time, the master brake series The conductor is closed to the control line by a reversal valve.

The pressure inside the wheel brake can be reduced quickly regardless of the throttle valve. If necessary, install a check valve that opens toward the master cylinder. , installed in parallel with the throttle valve. When the pressure in the master cylinder decreases, the The pressure reaches the wheel brakes via a check valve next to the throttle valve.

The invention can be integrated in a simple way into a so-called oven brake system. . An oven brake system is a supply reservoir in which the pressure medium collection means are open to the atmosphere. bar, which is the main brake cylinder when the master brake cylinder is deactivated. This refers to the part connected to the working chamber of the rake cylinder.

The permanent coupling between the pump piston and its eccentric firstly brake slip without requiring the body to be ejected from the wheel brake. This allows pressure medium to be supplied immediately after the start of top control.

Furthermore, the invention can be easily extended to traction slip control. this In order for this to happen, the brake line must be able to be closed. like this During traction slip control, the pressure medium supplied from the pump This prevents it from escaping into the brake cylinder.

Denier where one circuit is configured to brake the driving and non-driving wheels In a brake system, the branch of the brake line to the drive wheel is closed Must be branched upstream of the valve.

In a brake system, the pressure that switches the throttle valve is applied at the same time as the start of the control operation. Requires a spreading, fast-responsive pump. This increases the cost of this pump. Ru. To timely switch out a slow-moving pump built into the brake system. To do this, the throttle valve detects pressure fluctuations in the wheel brake and A switching device is provided for switching.

In particular, a switching device in which the drive rod is provided with a first separating piston is advantageous. Ru. The separation piston separates the housing into two chambers. And the switch The pressure in the chamber switches the throttle valve to the second switch position, while the pressure in the reset chamber switches the throttle valve to the second switch position. Place the throttle valve in the first switch position.

The reset chamber is connected to the wheel brake without restriction, and the switch chamber is connected to the wheel brake. When connected to a rake via an aperture, the following operation occurs.

If the wheel brake pressure drops suddenly by opening the outlet valve. , pressure fluctuations in the reset chamber act immediately. On the other hand, in the switch room, the speed is slowed down by the aperture. It acts as a result. Thus, the separation piston causes the throttle valve to be in the second switch position. A switching pressure gradient is created.

In order to maintain the throttle valve in the second switch position during the control operation, Furthermore, pump pressure may be used as the control pressure. This pump pressure is Even when the pressure in the reset chamber is balanced with the pressure in the reset chamber, the throttle valve is Hold in switch position.

The invention can be integrated in a simple way into a so-called oven brake system. . An oven brake system consists of a pressure medium collection means or a supply reservoir open to the atmosphere. bar, which is the main brake cylinder when the master brake cylinder is deactivated. This refers to the part connected to the working chamber of the rake cylinder.

Other switches that ensure early switching of the throttle valve at the beginning of the control operation The apparatus is described below. The basic idea is to open the outlet valve and The rake pressure acts on the throttle valve and switches the throttle valve.

By providing such a valve mechanism, anti-lock and torque exceeding conventional requirements can be achieved. Easy and reliable brake system fluid with traction slip control It can be a pressure circuit.

The throttle valve, in its base position, can be adjusted, for example by a spring, and connects the main pressure line. is open. Therefore, regardless of whether the fluid supply is from the pump side or the master cylinder side, A fluid connection for braking operation is enabled. Wheels for safe operation The outlet valve to the brake is located at the base to prevent fluid from returning to the supply reservoir. closed in position.

The outlet valve opens and returns to the feeding reservoir only when electromagnetically energized. and , the large mouth valve is extremely easy to switch with the return flow acting as a fluid control flow. available. Therefore, the throttle valve throttles the return of the brake line and at the same time Open the line.

The large mouth valve is designed as a controllable throttle valve, which allows the outlet valve to Anti-lock and traction slip in a simple way, regardless of clock frequency During control, the pressure is kept approximately constant corresponding to the electromagnetic control of the large mouth valve. In addition, slot Due to the inventive control of the throttle valve, the changeover to the throttle position occurs without delay. write This prevents the brake pedal from being pressed the full stroke.

The pressure in the wheel brake decreases rapidly, regardless of the throttling of the throttle valve. As shown in the figure, a check valve that opens toward the master brake cylinder is installed in parallel with the throttle valve. I'm being kicked. The pedal causes a sudden drop in the pressure in the master brake cylinder. In this case, the wheel pressure is reduced by a check valve next to the throttle valve.

Examples] An embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

First, in Figure 1, the brake system consists of master brake cylinder 1 and its upstream It consists of a vacuum brake power booster 2 connected to the side. Brake brake To operate the stem, press pedal 3 and use the increased pedal force or master Acts on brake cylinder 1. Master brake cylinder 1 has a supply reservoir -4 is provided. The supply reservoir 4 is and is connected to the working chamber of the master brake cylinder in a well-known manner. The above block The rake pressure generation mechanism is a normal one, and there is no particular difference compared to the conventional one.

Travel that detects the travel of the booster plate of vacuum brake power booster 2 A power switch 5 is connected to the vacuum brake power booster 2. Travels The signal of switch 5 is the pedal during pump control and brake slip control. Used for positioning.

The master brake cylinder 1 connects a first brake line 6 and a first brake line to a wheel brake. 2 are connected via a brake line 7. The first brake circuit is connected to the front cloth (VR ) wheel brake and a rear left (HL) wheel brake; The brake circuit consists of the rear right (HR) wheel brake and the front (VL) wheel brake. It is formed by the keys. Each branch line of the brake line has a two-position stop. A throttle valve 8 is inserted. In the first switch position, the master brake cylinder Da 1 and each wheel brake are connected without restriction.

When the throttle valve is switched, the branch line of the brake line is throttled.

A check valve 9 that opens toward the master brake cylinder 1 is connected in parallel to the throttle valve 8. It is continued. Furthermore, each wheel brake is connected to a supply supply via a return line 10. connected to server 4. Each branch line of this return line has an electromagnetic drive. A dynamic outlet valve 11 is provided. Each branch line of the return line 10 is connected to the above valve. In the non-operating position, it is closed.

When the outlet valve drive magnet is energized, the valve is in the open position.

Each brake line 6.7 is provided with a respective pump 12.13. child These pumps are driven by a motor M. The suction side is connected via the suction line 15. and is connected to the supply reservoir 4. Each suction line has a supply reservoir A suction valve 16 that closes toward the front is provided. The pressure side of the pump is pressure line 1 4 to each brake line 6.7. towards the brake line A pressure valve 17 is inserted into the pressure line 14 to open it. After the pressure valve 17, the other A suction valve 16 is inserted. A control line 19 to the throttle valve 18 is connected to the pressure It is branched from between the valve 17 and the suction valve 16. The suction valve 16 is a slip control valve. To prevent mask cylinder pressure from reaching control line 19 when braking without control. do. In this way, the throttle valve 8 is prevented from being in the throttle position during normal braking. To prevent.

The wheel is provided with a sensor S that detects the angular velocity of the wheel.

FIG. 2 shows an example of a throttle valve. The stepped piston 33 is connected to the housing. the stepped bores 31,32 of the ring 30. The stepped piston 33 has four It is composed of parts. The first part 34 is sealed to the large stepped bore 31 and is provided with a gasket. is ided. The second part 37 is sealed and guided by the small bore 32 of the stepped bore. . Between the first part and the second part, following the first part, the diameter is slightly smaller than the diameter of the small bore 32 of the stepped bore. There is a third part 35, which has a much smaller diameter. There is a stepped button between the third part and the second part. There is a fourth portion 36 having a diameter considerably smaller than the diameter of the small bore 32 of A. piston 33 is in contact with the stop 38 by means of a spring 39. And part 3 35? , within the region of the large bore 31 of the stepped bore.

The control line 19 is connected by the first piston part 34 on the opposite side of the second piston part 37. connected to a designated room. The annular chamber inside the large bore is the master brake cylinder 1. (connection 40), while the annular chamber in the small bore 32 is connected to the wheel brake. (Connection 41).

At the position of the stepped piston 33 shown in the figure, the master brake cylinder 1 and the wheel It is connected to the brake without any restriction.

When pressure is applied to the control line 19, the stepped piston 33 moves to the right side in the figure. Shift into bore 32. Then, the third piston portion 35 enters the small bore 32. . The annular gap between the piston portion 35 and the small bore 32 is connected to the master brake cylinder 1. and the connection between the wheel brake and the wheel brake.

An example of a pump is shown in FIG. This consists of two pump pistons 51.5 1' is a double piston pump. These pistons share a common eccentric Driven by trick 52. The pump chamber 50 is connected to a suction line via the suction valve 16. It is connected to the pressure line 15 and via the pressure valve 17 to the pressure line 14 .

The eccentric 52 is formed on the drive shaft 53.

The piston 51, 51' is always eccentric via the coupling ring 54. It is important to be in contact with people. Thus, the forced drive of the piston 51, 51' is done regardless of the pump's filling status.

The brake system operates according to the following principle.

During braking without slip control, the outlet valve 11 is closed and the throttle valve is not throttled. be in position Motor S is switched off. In this way, the master brake The cylinder 1 and each wheel brake are connected without any restriction. Pedal 3 is pressed Pressure is applied to the wheel brake. The check valve 18 prevents the mask cylinder pressure from There is no pressure on the control line 19 as it prevents standing on the control line.

If the sensor detects a critical lock on any wheel, the system will Switched to anti-lock or control mode. This will result in an emergency lock wheel. The outlet valve 11 of the pump is opened, and the motor M is energized and the pump 12.13 starts pumping. Start. In this way, pressure is generated on the pump outlet before the suction valve 16, and the control line 19 becomes effective, and the throttle valve 8 is switched. By switching, stepped piston 33, and a diaphragm effect occurs. pump 12.13 or fluid, throttle valve 8 After passing through the throttle, it is sent to the wheel brakes. The pressure medium crosses the opening cross section of the outlet valve 11. , more is delivered to the supply reservoir 4 than is delivered through the throttle of the throttle valve 8. As the wheels are allowed to move, the pressure on each wheel brake decreases. outlet valve is closed Then, the pressure medium is supplied by the pump 12.13 and the pressure increases, so that the pressure builds up. It will be done.

By pulsing the outlet valve 11, the pressure can also be kept constant. Pon The amount of pressure medium supplied by the pump is returned to the supply reservoir via the outlet valve. equal to the amount

Various pressure increase and/or decrease speeds are achieved by pulse driving the outlet valve 11. be able to.

Since the outlet valve 11 is electromagnetically driven, whereas the 'inlet valve' is only fluidically driven. , the cost of electronics to drive the control valve can be significantly reduced.

During pressure control operation, the pressure in the mask cylinder decreases, i.e. with the wheel brake. When the pressure drops below the set pressure, the pressure medium is removed from the wheel brake via the check valve 9 , returns to master brake cylinder 1. Therefore, the throttle valve 8 switches the switch Regardless of the valve, a faster pressure drop can be achieved if the vehicle driver desires it. .

Figure 4 shows that pressure is applied to the wheel brake line 6.7 regardless of pedal operation. A circuit is shown that allows for traction slip control (TSC). . For this purpose, an electromagnetically driven TSC valve 60.61 is installed in each brake line 6.7. I'm being kicked. These valves are open in the de-energized position and energized to the closed position. this In the example, assume that the wheels on the front axle are driven. Therefore, TSC valve 60.61 is inserted into the brake line and reaches the non-drive wheel of the rear axle. The line branches from between master brake cylinder 1 and TSC valve 60.61. has been done. The pressure line 14 is connected to the brake line downstream of the TSC valves 60, 61. has reached.

In traction slip control mode, the pump 12.13 Connected only to wheel brakes.

Opening and closing the outlet valve activates the wheel brake in a manner similar to brake slip control. Adjust the pressure in the rake. In this way, the driving moment is always between the road surface and the tires. It tunes to the friction ratio between Therefore, the drive wheels may slip or cause side collisions. loss of id ability is prevented.

In the following FIG. 5, only one brake circuit with pump 12 is shown.

Other circuits are similarly configured.

The throttle valve 8 is equipped with a switch consisting of a drive rod 21 that drives the throttle valve. A switch section 20 is provided. A first separation piston 22 and a first separation piston 22 are attached to the drive rod 21. 2. The separation piston 23 is fixed. The first separation piston 22 is connected to the first switch. It is separated into two chambers, a chamber 24 and a reset chamber 25.

The pressure in the first switch chamber 24 moves the throttle valve 8 from the first to the second switch. switch to the touch position. The pressure in the reset chamber 25 is 8 from the second to the first switch position. Both chambers 24.25 are respectively Via connection line 29.49 wheel brake 42 and/or throttle valve 8 and the control line 6 between the wheel brake 42 and the wheel brake 42. Constant aperture 4 8 is inserted into the line 49 leading to the first switch chamber 24. Second separation wall 2 3 is connected to the second switch chamber 26 connected to the control line 28 and to the supply reservoir 4. It is separated into a first chamber 27 which communicates with the first chamber 27. Therefore, the first chamber 27 is always pressurized. There isn't.

The brake system operates according to the following principle.

During uncontrolled braking, the outlet valve 11 is closed and the throttle valve 8 is not throttled. It is located at Motor S is switched off. In this way, the master brake The cylinder 1 and each wheel brake are connected without restriction. Pedal 3 is pressed Pressure is then applied to the wheel brakes. The check valve 18 controls the mask cylinder pressure. is prevented from standing on the control line, so no pressure acts on the control line 28. , because the check valve 18 prevents this.

When sensor S detects an emergency lock of any wheel, the system is switched to anti-lock or control mode. This causes the outlet valve 11 to open. Then, the motor M is energized again and the pump 12 starts pumping. Outlet valve 11 is open By this, the pressure medium is discharged from the wheel brake 42 into the supply reservoir 4. It will be done. The throttle valve has a slight throttling effect even in the first switch position. Then, the pressure medium is discharged and the pressure in the wheel brake decreases. This pressure drop is , also occurs in chambers 24 and 25. However, the pressure drop in chamber 24 is due to the action of restrictor 48. Occurs with a delay depending on the situation. A pressure gradient is created in the first separation piston 22, causing the separation piston to Move the ton 22 to the left on the drawing. Also, the throttle valve is in the second switch position. Switched to H.

In the course of this, sufficient pressure builds up at the outlet of pump 12, which creates a pressure in chamber 26. use The drive rod then switches the throttle valve 8 to the second switch position. 21.

Note that even if the pressures in the chambers 24 and 25 are balanced again, the pump 12 will not be able to deliver. The throttle valve remains in the second switch position as long as the throttle valve remains in the second switch position.

The pump 12 directs fluid to the wheel brakes through a throttle in the throttle valve 8. send. The pressure medium passes through the opening cross section of the outlet valve 11 through the throttle valve 8. If more is pumped into supply reservoir 4 than into brake pressure decreases. When the outlet valve is closed, the pressure medium is removed by the pump 12. is supplied to the wheel brake and the pressure increases, so a pressure builds up.

By pulsing the outlet valve 11, the pressure can also be kept constant. Pon The amount of pressure medium supplied by the pump is returned to the supply reservoir via the outlet valve. equal to the amount

Various pressure increase and/or decrease speeds are achieved by pulse driving the outlet valve 11. be able to.

The outlet valve 11 is electromagnetically driven, while the 'inlet valve' (throttle valve) is fluid driven. The cost of electronics to drive the control valve is greatly reduced. can be reduced to

During pressure control operation, the pressure in the mask cylinder decreases, i.e. with the wheel brake. When the pressure drops below the set pressure, the pressure medium is removed from the wheel brake via the check valve 9 , returns to master brake cylinder 1. Therefore, the throttle valve 8 switches the switch Regardless of the valve, if the vehicle driver desires, a fast pressure drop is obtained. .

Next, other operations of the throttle valve 8 are shown in FIGS. 6 to 10.

FIG. 6 shows a traction slip and/or brake slip control circuit.

In order to make it easier to understand the whole braking system, we have already explained the wheel brakes. Among the elements, only particularly relevant structures and functions will be explained.

In order to supply pressure medium to the wheel brakes 42, a branch line 75 and its A brake lever with a 4-way 2-position throttle valve inserted in it that is open at the base position. An inlet 6 is provided in fluid connection between the wheel brake 42 and the supply reservoir 4. The above branch line is connected to master brake cylinder 1. . In the other branch line of the supply reservoir 4, the pump 12 is connected to a check valve 16.17. ．． 90 and a throttle valve 8 before the wheel brake 42. and an outlet valve 11 are inserted. The branch line 75 is connected to the output of the auxiliary pump 12. The side is connected to the master brake cylinder 1. This branch line 75 has Pressure limiting valve 85 and central valve 70 and mask cylinder controlled by pump pressure A throttle valve and a reversal valve are provided which are controlled by pressure.

When the brake is not activated, the pressure medium from the supply reservoir 4 is open the central valve 70 which is in position and the throttle valve which is open in the base position provided after that. After that, the wheel brake 42 is filled with water. At this time, the outlet valve 11 is electromagnetically Closed in base position. Return light branched from wheel brake 42 The throttle valve 8 is in the closed 4-way, 2-position position and the throttle valve 8 is in the base position when not energized and is closed. It is separated from the pressure medium by a closed outlet valve 11. Pressure medium in the system The amount increases or decreases due to temperature changes due to the above-mentioned valve position. , is not affected in any way.

During normal brake operation using the pedal, the pressure is reduced by the throttle action of the central valve 7°. will be uploaded. This pressure then acts as a reaction force on the central valve 70, causing the valve to Fluidly switch.

In the second case, a check valve built into the central valve 70 allows the supply reservoir 4 and the pump 12 to The orientation will be locked. As a result, the brake line 6 is connected to the branch line 75. Separated. As a result, a pressure proportional to the pedal force is applied to the brake line 6.

Then, because the outlet valve 11 is closed and the throttle valve 8 is in the throttle position, It propagates to the wheel brake 42. Connected to return line 10 and pressure line 14 The affected pump 12 is not affected in any way.

As soon as the brake slip signal indicates overbraking of a wheel, the No, switch to slip control. Anti-lock control reduces brake pressure and/or The volume is lowered by the outlet valve 11 which is opened by a control signal. Also, regulations The control activates the pump 12 and produces an operating pressure of approximately 140 bar. . Depending on the friction and construction of the pump, it may take approximately 150 millimeters to reach the required pressure. This results in a non-negligible delay in cand. Backed up with open outlet valve 11 During the pressure reduction before the throttle built into the throttle valve 8, the throttle valve 8 is used as the switching control pressure.

Therefore, as soon as the outlet valve 11 is opened, the throttle valve 8 is switched 12 is done regardless of how early it starts running. Therefore, the present invention This prevents the pedal from being pressed through its entire stroke. This is because the pressure medium flow After reaching the throttle position where the throttle valve is almost closed, the throttle valve 8 is opened by fluid pressure. This is because there is no need to change the pulse-driven outlet. A valve 11 allows pressure medium to escape from the mask brake cylinder 1 into a return line 10. , the pedal stroke becomes unfavorably large.

After the throttle valve 8 is switched, the amount of pressure medium to the wheel brake 42, It is throttled by the throttle position of the throttle valve 8 and acts on the brake line 6. on the other hand, The return line 10 is opened by an outlet valve 11 and a throttle valve 8. instructor This ensures a rapid drop in pressure.

By driving the outlet valve 11 in pulses or steps at a predetermined control frequency, the pressure can be increased. Expensive electronic control of the throttle valve 8 is used to maintain force and control the rate of increase or decrease of various pressures. This can be accomplished without any supervision.

When the pressure inside the master brake cylinder 1 drops below the wheel brake control pressure, The rapid pressure drop at the wheel brake 42 is connected in parallel to the throttle valve 8. This is caused by the check valve 9. This is because the throttle position of the throttle valve 8 is bypassed. This is because

When the pump 12 is driven by electronic control in the traction slip control mode, Pressure and system pressure in brake line 14.6 increases and branch line 7 A central valve 70, which is separately provided at will be backed up. A return of pressure medium to the supply reservoir 4 is thus prevented.

Therefore, traction slip control consists of the electromagnetic drive of the outlet valve 11 and the throttle valve. This is done by the hollow-up control of No. 8.

In TSC control as well, pressure increase, pressure maintenance, and pressure decrease phase, or the above-mentioned As in the case of ABS control, this is done by pulse control of the outlet valve. Therefore, electricity There is no need to use a magnetically driven throttle valve 8. Therefore, the switching of the throttle valve 8 is , when the outlet valve 11 is open, is done by fluid pressure.

Therefore, the wheel brake pressure is controlled by throttle control of the throttle valve 8. Ru.

No special TSC = isolation valve required compared to traditional traction slip control systems becomes. This is because the central valve 70 of the branch line 75 has a separate connection structure. and this valve is closed by pump pressure, so the supply ressurance This is because there is only a return flow of holding pressure to the server 4.

Due to specific circumstances, the central valve 70 provided in the branch line 75 may be replaced with a pump. It may be provided in the valve block 12 or the valve block. In this way, the central valve 70 is By separating it from inside the leakage cylinder 1, the structure of the master leakage cylinder 1 is simplified. Simply become. Furthermore, air vent holes and reservoir connections are no longer required, and the brake unit It is possible to shorten the total length of . In addition, the supply rehearsal 4 is connected to the pump 12 or the valve. Can be installed on the block.

FIG. 7 shows a modification of ABS/TSC control.

Pressure increase, pressure hold, and pressure decrease faces are two-way, two-position control valves, easy to use. The use of a throttle valve 8 having a unique structure, and the switching, holding, and This can be achieved using a diaphragm. In this case, there is no need to press the pedal all the way. Therefore, the electromagnetically driven outlet valve 11 is in a position where the throttle valve 8 is not throttled, and the anti-rotation Can be opened when lock control starts. of the throttle valve 8 by opening the outlet valve 11. The operation is similar to that in FIG. After the outlet valve 11 of the return line 10, a throttle A low pressure accumulator 92 having 93 is provided.

In this way, the pressure in the wheel brake 42 is reduced relatively quickly, and excess pressure fluid is removed. body is received in the low pressure accumulator 92, and the switching position of the throttle valve 8 is stable. do. The initial pressure of the low pressure accumulator 92 is preferably 1 to 6 bar.

A similar ABS/TSC control circuit as shown in Figure 6.7 is shown in Figure 8. Ru. The throttle valve 8 of this is a 4-way 2-position valve, and its control line 81 is a return valve. It is branched from between the outlet valve 11 of the inlet 10 and the throttle 93. The circuit in Figure 8 is based on In order to explain the essential effect, the description is limited to ABS control only. However, the 6th. Similar to the circuit shown in Figure 7, insert a separation valve in the brake line 6 or By providing a valve in the shunt line between the brake line 6 and the pump 12 , TSC control can be performed.

During normal brake operation without slip control, the throttle valve 8 and outlet valve 11 is in the position shown in FIG. Therefore, the brake pressure, which is proportional to the pedal force, is It reaches the wheel brake 42 via the key line 6. On the other hand, throttle valve 8 and The return line 10 from the outlet valve 11 is closed. Therefore, throttle valve 8 No pressure is acting on the control line 81 to.

When brake slip control and traction slip control are started, the outlet valve 11 The pressure drop between the outlet valve 11 and the restriction 93 due to the opening of the control line 81 It acts on the throttle valve 8 through the throttle valve 8, and the throttle valve 8 is switched. Therefore, the blur The pressure medium passing through the key line 6 and entering the wheel brake 42 flows through the throttle valve 8. It is narrowed down depending on the aperture position. After the outlet valve 11, compared to the case of FIG. 6.7 described above, The inserted throttle 93 determines the time it takes for the throttle valve 8 to switch to the non-throttle base position. decide. As a result, the control deviation for the desired control characteristic line in the case of FIG. This can improve key pressure fluctuations.

In the case of Fig. 8, the action of the throttle valve 8 has already been explained in relation to Fig. 6.7. As explained above, it can also be applied to TSC control.

FIG. 9 shows the ABS/TSC control similar to that shown in each of the previous figures, especially in the case shown in FIG. This is a modification of switching. However, in FIG. 9, the check valve 94 which closes toward the outlet valve 11 is connected downstream of the outlet valve 11 in parallel with the throttle 93 . Therefore, the aperture 93 By combining the check valve 94 and the check valve 94 structurally, a pressure relief valve can be obtained in a simple manner. Ru. This results in unfavorable effects on the pressure medium flow, especially due to the low temperature of the pressure medium. Prevents viscosity effects.

In the fluid circuit shown in Fig. 9, a central valve (not shown) or a built-in valve are shown for explanation of the operation. Star brake cylinder 1 and only one wheel brake control circuit are shown. Ru. Brake line 6 to wheel brake 42 is connected to pump 12 A separation valve 79 is installed before the branch of the pressure line 14. This isolation valve , in the open position at the base position, electromagnetically energized by TSC control, and the master brake Preventing the flow of pressure medium into the cylinder 1. In parallel with isolation valve 79, master brake A pressure relief valve, which is a check valve 91 that opens toward the xylinder 1, is provided, and the TC5 Limits the maximum system pressure during control. The known methods already described in detail and In the above explanation of the operation, in addition to the normal brake, the brake is caused by the wheel sensor 95. -ABS/TCS electronic control by kiss slip and traction slip signals Data processing is done in . The signal then indicates that the isolation valve 79 is in TSC mode. electromagnetic drive and/or traction slip control and anti-lock control. It is delivered to the electromagnetic drive section of the mouth valve 11. The pump 12 is driven by the mask cylinder side or It is controlled by a travel sensor 78 provided on the pedal side.

As shown in Figure 10, the throttle connected downstream of the outlet valve 11 (Figure 7.8.9) is replaced with a two-position valve 96 to operate the throttle valve 8. The preferred rapid pressure drop in line 81 can be achieved in a simple manner. Because , when the load on the brake pedal is removed, it immediately becomes non-throttled and the control pressure decreases. descend. Therefore, the time required to switch the throttle valve 8 using fluid pressure is shortened.

Switching of the second valve 96 is performed using the second valve connected downstream of the separation valve 79 of the brake line 6. This is done by the control line 81 of No. 2. Provided in series within return line 10 The second valve 96 is in the open position at the base position, and is connected to the pedal side of the brake line 6 and Switched depending on the pressure level on the pump side. Therefore, switch the throttle valve 8 The control pressure necessary for Formed by a valve. In Figure 10, the second valve 96 is connected to the brake circuit. The ABS/TC3 circuit shown in FIG. 9 is further improved.

Eliminates the need for valves that have a complicated structure, are expensive to manufacture, and are prone to trouble, as explained earlier. It is important to note that the invention allows the valve to be dispensed with.

Submission of translation of written amendment (Article 184-8 of the Patent Law) December 17, 1991

Claims (1)

[Claims] 1. In anti-lock hydraulic brake systems for automobiles; master brake cylinder (1); with pressure medium accumulation means (4); with at least one wheel brake; , connected to the master brake cylinder (1) via the brake line (6). and connected to the pressure medium accumulation means (4) via a return line (10). an electromagnetically driven outlet valve (11) inserted into the return line (10); Close the return line (10) in the excitation position and close the return line (10) in the excitation position. a slot with two positions to be inserted into the brake line (6); A valve (8) connects the wheel brake and the master brake cylinder (1). In the first switch position, the connection is made without a throttle, and in the second switch position, the connection is made with a throttle. The pump (13) sucks the pressure medium from the pressure medium accumulation means (4) to increase the pressure. via a force line (14) to said master brake cylinder (1); A sensor that detects the angular velocity of the wheel to be braked; and a signal from the above sensor. An electronic analysis unit that analyzes and sends signals to the pump drive and outlet valve (11). The throttle valve (8) is connected to the throttle valve (8) via the control line (19). connected to the outlet of the pump (13), thus the outlet pressure of said pump (13) is Switch the throttle valve (8) from the first switch position to the second switch position. A brake system that is characterized by being able to move. 2. A check valve (9) that opens toward the master brake cylinder (1) is installed in the slot Brake system according to claim 1, connected in parallel to the torque valve (8). 3. The pressure medium accumulation means is a supply reservoir (4) open to the atmosphere; Connected to the working chamber of the master cylinder when the master cylinder is not operating. The brake system according to claim 1 or 2. 4. The above brake system is a dual circuit design, each brake circuit is connected to the car are applied to diagonally opposite wheels, and each brake circuit has one pump ( 12, 13) Brake system according to any one of the preceding claims, comprising: . 5. The pumps (12, 13) are driven by one common motor. The brake system according to claim 4, wherein: 6. The above-mentioned pump is a piston pump (12, 13), and the pump piston is driven by one eccentric (52) and the pump piston is driven by one eccentric (52). The brake system according to claim 1, wherein the brake system is in constant contact with the eccentric (52). Mu. 7. The throttle valve (8) is a stepped piston (33), and the corresponding stepped bore (3 1, 32), and the stepped piston (33) is guided within the stepped piston (33). an intermediate portion (35) insertable into the small bore (32) of the intermediate portion (35); 5) and the wall of the small bore (32) to restrict the flow of pressure medium. Brake system according to any one of the preceding claims. 8. The brake lines (6, 7) are connected to the pressure line (14). It is squeezed between the point where it is connected to the line and the master brake cylinder (1). (TSC valve 60, 61) rake system. 9. The brakes for the drive and non-drive wheels are in one brake circuit, The brake line to the non-driving wheel is connected to the TSC valve (60, 61) and the master. The brake according to claim 8, which is branched from between the star brake cylinder (1). rake system. 10. The throttle valve (8) is equipped with a valve that responds to pressure fluctuations of the wheel brake (42). A switch section (20) that switches the throttle valve accordingly is connected to the Brake system according to any one of the requirements. 11. The switch part (20) has a first separation piston (22) formed thereon. The first separating piston (22) has a housing. It is separated into two chambers (24, 25), and the pressure in one chamber (first switch chamber 24) is Switch the throttle valve (8) to the second switch position II and open the other chamber (reset chamber 25). ) is such that the pressure is such that the throttle valve is held in the first switch position I. Brake system according to item 10. 12. The reset chamber (25) is connected to the wheel brake (42) without a throttle. On the other hand, the first switch chamber (24) is connected to the above through the diaphragm (48). Brake system according to claim 11, connected to a wheel brake (42). Mu. 13. A second switch chamber connected to the drive rod (21) and the pump outlet (26) is provided with a second separation piston (23) that partitions the second switch chamber. When pressure is applied to the throttle valve (8), the throttle valve (8) switches to the second switch position II. 12. The brake system according to claim 11, wherein the brake system is adapted to be switched to. 14. Traction slip and brake slip control fluid pressure valve especially for automobiles in the rake system; with the master brake cylinder; with the supply reservoir; at least one With two wheel brakes, connect the brake line to the master brake cylinder above. and shall be connected to the supply reservoir via a return line. ;Throttle valve installed on the wheel brake;Inserted into the above return line An electromagnetically driven outlet valve closes the above return line in the de-energized position and closes the above return line in the energized position. With a pump that opens the inlet; the pump draws pressure medium from the supply reservoir and auxiliary pressure The brake should be sent to the master brake cylinder via the line above; A sensor that detects the angular velocity of the wheel; the signal from the above sensor is analyzed and the pump It consists of an electronic analysis unit that sends signals to the drive and outlet valves. When the outlet valve (11) is opened, the wheel brake pressure is applied to the throttle valve. (8), the wheel brake pressure turns off the throttle valve (8). A brake system characterized by being replaceable. 15. The throttle valve (8) is connected to the wheel brake (42) and the master. It is provided between the brake cylinder (1) and the outlet valve (11) is closed. when the brake line (6) remains open and the outlet valve (11) 15. The return line (10) according to claim 14, adapted to close the return line (10) connected to the brake system. 16. Fluid pressure switching of throttle valve (8) based on the above wheel brake pressure The flow rate of the brake line (6) is throttled, and the outlet valve (11) is ) to the supply reservoir (4) to release the return flow in the return line (10). The brake system according to claim 14 or 15. 17. A throttle (93) connects said return line (10) connected to said outlet valve (11). ), and the throttle valve (8) is installed in series at the base position without throttle. Any one of claims 14 to 16, wherein the time for switching to the position is determined. Brake system as described in. 18. A check valve (94) that opens toward the return line (10) is downstream of the outlet valve. The brake system according to any one of claims 14 to 17, connected to Mu. 19. The check valve (94) is provided in parallel with the throttle (93), and one 19. The brake system of claim 18, comprising a pressure relief valve. 20. The throttle valve (8) is a four-way, two-position valve, preferably spring-loaded. and hold said brake line (6) open in the base position while the supply reservoir ( 15. The brake system according to claim 14, wherein the return line to 4) is closed. 21. The control line (81) that drives the throttle valve (8) is connected to the return line. branched from between the throttle (93) and the outlet valve (11) of the valve (10). 15. The brake system according to claim 14. 22. Downstream of the outlet valve (11), the master brake cylinder (1) and the upper a two-position valve (acting as a check valve) driven by the pressure of the pump (12); 15. The brake system according to claim 14, further comprising: 96).