JP2022507326A - Brake system and how to drive the brake system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake system (100) for a vehicle and a method for driving the brake system (100). SOLUTION: A primary piston (11) that can be swung by a spindle drive means (7) in a cylinder chamber (10) having a primary outlet (10A), and the primary piston that plunges into the cylinder chamber (10). It has a master brake cylinder (1) with an inlet plunger (6) that can be pivotally swung within (11), and has a wheel brake circuit (2) with a wheel brake cylinder (20). It has a pressure conversion device (3) including a pump motor (30) and a pump device (31) connected to the wheel brake cylinder (20) driven by the pump motor (30). The primary outlet (10A) of the master brake cylinder (1) is separated from the wheel brake circuit (2) in the closed state, and the primary outlet (10A) of the master brake cylinder (1) is separated in the open state. It has a switching valve (4) for connecting the wheel brake circuit (2) to the control device (5), and the control device (5) has the switching valve in the first operation mode. (4) is closed, and the pump motor (30) depends on an operation signal representing the amount of axial movement of the inlet plunger (6) for the wheel brake cylinder (20) to adjust the braking pressure. The inlet plunger (6), which is provided to be operated so as to be operated, further uses the spindle driving means (7) of the master brake cylinder (1) by the axial movement of the primary piston (11). It is provided to operate so that a reaction force depending on the stroke acts according to a predetermined characteristic against the axial movement. [Selection diagram] Fig. 1

Description

Brake systems for vehicles, especially automobiles such as passenger cars or freight cars, are generally implemented as hydraulic brake systems. As standard, such a type of brake system has a master brake cylinder with an actuator piston. The master brake cylinder may be directly manually operable or may be operable using a brake booster. When using a brake booster, the master brake cylinder is, in standard form, driven according to an operating signal that represents the amount of axial movement of the manually operated inlet piston. The hydraulic pressure generated in the master brake cylinder is transmitted to the wheel brake to increase the brake pressure. Pressure conversion circuits are often incorporated within such brake systems, which allow the inlet and outlet valves to convert brake pressure independently of the master brake cylinder. It has a pressure generator connected to the wheel brake via. Such a system is described in, for example, Patent Document 1.

So-called brake-by-wire systems are also being used more and more. Such a system is described in, for example, Patent Document 2. In this brake system, hydraulic pressure is generated in the simulator device by operating the master brake cylinder. The pressure generated by the master brake cylinder is detected and the detected pressure is used to operate the wheel brake using a motor and a pressure generator with a push-down piston that can be moved with this motor. The target braking pressure adjusted in the active circuit is calculated.

European Patent Publication No. 0281769 German Federal Republic Patent Publication No. 102011079454

According to the first aspect of the present invention, a braking system for a vehicle is provided. The brake system has a master brake cylinder, which is connected to a primary piston that is axially slidable in a cylinder chamber with a primary outlet and that is plunged into the cylinder chamber and connected to a brake pedal. It is equipped with an inlet plunger that can be pivotally swung within the primary piston and a spindle drive means connected to the primary piston for axially manipulating the primary piston. That is, the volume of the cylinder chamber can be changed by moving the primary piston in the axial direction. In addition, the cylinder volume can be changed by the inlet plunger. The braking system further has a wheel brake circuit with at least one wheel brake cylinder and also has a pump motor and a pressure conversion with a pump connected to the wheel brake cylinder driven by this pump motor. Has a device. The brake system has a switching valve that separates the primary outlet of the master brake cylinder from the wheel brake circuit in the closed state and connects the primary outlet of the master brake cylinder to the wheel brake circuit in the open state. It has become like. According to the present invention, a control device is further provided, in which the control device closes the switching valve in the first operation mode, and the pump motor and the wheel brake cylinder adjust the brake pressure of the inlet plunger. It is provided to operate so as to be operated depending on the operation signal indicating the amount of axial movement of the master brake cylinder, and further, the spindle drive means of the master brake cylinder is moved in the axial direction of the inlet plunger by the axial movement of the primary piston. It is provided to operate so that a reaction force depending on the stroke acts according to a predetermined characteristic in opposition to the above.

The idea underlying the present invention is to separate the master brake cylinder from the wheel brake cylinder hydraulically using a switching valve, use the master brake cylinder as a brake sensation simulator, and use a pressure converter to brake the wheel. The point is that the brake pressure is generated in the cylinder. In order to operate the master brake cylinder as a brake sensation simulator, the primary piston is adjusted by the spindle drive means so that a reaction force acts on the inlet plunger when the inlet plunger is moved, and at this time, the reaction force is applied to the inlet plunger. It is adjusted according to a predetermined change depending on the axial movement distance or the adjustment stroke. A given change or given property may be, for example, a linear change, a parabolic change or a change according to a higher gradient polynomial. The axial movement distance of the inlet plunger can be detected by using, for example, a stroke sensor, and in this case, the value detected by the stroke sensor can form an operation signal. By adjusting the primary piston, the volume change in the cylinder chamber, which occurs based on the operation of the inlet plunger, can be completely or partially compensated, so that stroke simulation is realized.

By using the master brake cylinder as a brake sensation simulator, there is an advantage that various characteristics of the reaction force can be freely adjusted. However, in particular, the master brake cylinder can be used to generate a brake pressure by opening the switching valve in the event of an operational failure of the pressure converter. Therefore, this braking system can be further operated in safety mode without any perceived output loss. This improves the failsafe of the system.

According to one embodiment of the braking system, the outlet of the pumping device is connected to the wheel brake cylinder via the wheel inlet valve and the inlet of the pumping device is connected to the wheel brake cylinder via the wheel outlet valve. An intermediate storage device is connected to the wheel brake circuit via a wheel outlet valve. The intermediate storage device may be implemented, for example, as an isolated accumulator or as a reservoir tank fluidized into the cylinder chamber through a sniffer hole under ambient pressure.

According to one embodiment, the controller sets the switching valve and the wheel outlet valve in the first mode of operation when the primary piston is in a stopper position where the volume of the cylinder chamber can no longer be increased by this primary piston. An open and spindle drive means is provided to operate such that the primary piston is displaced and displaced from the stopper position, thereby supplying the volume displaced by the inlet plunger and / or the primary piston to the intermediate storage device. Has been done. That is, the primary piston is moved away from the stopper position, thereby reducing the volume of the cylinder chamber or pushing the hydraulic fluid out of the cylinder chamber, thereby ensuring that the cylinder chamber is not completely filled. The extruded volume is pushed into the wheel brake via the switching valve and from the wheel brake into the intermediate storage device by the wheel exhaust valve.

According to another embodiment, in the second mode of operation, the control device opens the switching valve, and the spindle drive means and / or the pump motor follows the vehicle control signal, and the wheel brake cylinder brake pressure is applied to the vehicle control signal. It is provided for driving to be operated to adjust depending on the vehicle, in which case the control signal is provided by the vehicle interface of the controller provided for coupling to the vehicle. In this case, the brake pressure is generated by the primary piston and / or the pressure converter when the switching valve is open. Preferably, this is done in common by the primary piston and the pressure converter. This is because this puts a smaller load on the spindle drive means and the pump device, respectively. This may be friendly to the components, or the components may be designed for smaller loads. The control signal is generated by an onboard computer in particular based on the distance data during autonomous driving of the vehicle and can represent a braking request.

According to another embodiment, in the second operating mode, the control device causes the spindle drive means to move in the axial direction of the inlet plunger, and the volume change of the cylinder chamber is the opposite axial direction of the primary piston. It is provided for driving so as to be corrected by movement. Therefore, the operation of the inlet plunger is invalidated by the driver or by the volume change of the cylinder chamber caused by the operation of the inlet plunger. That is, the primary piston is moved back by a distance corresponding to the volume change due to the inlet plunger. This allows the inlet plunger to be functionally separated from the wheel brake circuit in a simple form and without additional components. In particular, this does not cause a change in brake pressure due to the operation of the inlet plunger.

According to another embodiment, the controller is in a second mode of operation when the primary piston is in a stopper position where the volume of the cylinder chamber can no longer be increased by this primary piston, the switching valve and the wheel outlet valve. And to operate the spindle drive means so that the primary piston is displaced and displaced from the stopper position, thereby supplying the volume displaced by the inlet plunger and / or the primary piston to the intermediate storage device. It is provided. This operation of the primary piston by the spindle drive means is performed when the primary piston is in the stopper position, similar to the operation for the first mode of operation.

According to another embodiment, the inlet plunger is slidable by the inlet rod, and the inlet plunger is urged in the direction toward the inlet rod by the first spring. In this way, the inlet plunger is pushed towards the inlet rod so that the inlet plunger is applied to the inlet rod when the inlet rod is moved in the return direction. However, the inlet plunger can be moved in the feed direction independently of the inlet rod against the force of the first spring. This prevents the inlet rods from being brought together, for example in the second mode of operation, in some cases. The first spring may be supported, for example, by the primary piston.

According to another embodiment, the spindle drive means has a drive, a spindle that is axially slidable by the drive, and a support plate connected to the spindle. The support plate forms an interlocking member for the primary piston, or the primary piston is in contact with the support plate. Optionally, the primary piston is urged toward the support plate by a second spring or pressed against the support plate by a second spring. This ensures a firm fit between the support plate and the primary piston.

According to another embodiment, the support plate is urged by a return spring supported by a housing defining the cylinder chamber. The return spring may abut on the housing at the first end and abut on the support plate at the second end. Optionally, the return spring is adapted to abut the housing at the first end and a radial shoulder of the primary piston at the second end, thereby pressing the primary piston against the support plate. It's okay.

According to another embodiment, the master cylinder is configured as a tandem cylinder and has a secondary piston in addition to the primary piston, which secondary piston is located between the primary and secondary outlets. It is axially slidable within the area of the cylinder chamber in which it is located. Another wheel brake circuit is connected to the primary outlet via another switching valve, and the wheel brake cylinder of another wheel brake circuit is another driven by the pump motor of the pressure converter, as described above. Can be operated via a pump.

According to another aspect of the invention, there is provided a method for operating the braking system according to one of the above embodiments. According to the present invention, the inlet plunger is moved in the axial direction, and at this time, in the first operation mode, an operation signal indicating the amount of movement of the inlet plunger in the axial direction is generated. In another step, the switching valve is closed, the pump motor is operated so that the wheel brake cylinder is operated depending on the operation signal, and the axial movement of the inlet plunger due to the axial movement of the primary piston is performed. The operation of the spindle drive means of the master brake cylinder is performed so that a reaction force depending on the stroke acts according to a predetermined characteristic.

It is a schematic diagram of the brake system according to 1 Embodiment of this invention. It is a schematic diagram which shows the master brake cylinder of the brake system by another Embodiment of this invention. It is a schematic diagram of the master brake cylinder of the brake system according to another embodiment of this invention.

The present invention will be described in detail below with reference to examples shown in schematic drawings.

In the drawings, elements, features and components that are the same, functionally the same and have the same action are each designated the same, unless otherwise described.

FIG. 1 shows an example of a braking system 100 for a vehicle. The brake system 100 includes a master brake cylinder 1, at least one wheel brake circuit 2, a pressure conversion device 3, a switching valve 4 for each wheel brake circuit 2, a control device 5, and an optional one for each wheel brake circuit 2. It has a high-pressure switching valve 9. The brake system 100 shown as an example in FIG. 1 has a first wheel brake circuit 2A and a second wheel brake circuit 2B.

The master brake cylinder 1 shown as an example in FIG. 1 has a housing 15 that defines a cylinder chamber 10 extending in the axial direction. The master brake cylinder 1 shown as an example in FIG. 1 is configured as a tandem cylinder including a primary piston 11 and a secondary piston 12. The primary piston 11 and the optional secondary piston are axially slidable bearings within the cylinder chamber 10. The housing 15 has a primary outlet 10A and a secondary outlet 10B. The primary outlet 10A is located between the first axial end 15A of the cylinder chamber 10 and the second axial end 15B at a position opposite to the first axial end 15A. There is. The secondary outlet 10B is arranged between the primary outlet 10A and the second axial end portion 15B of the cylinder chamber 10. The primary piston 11 is axially slidable within the first region of the cylinder chamber 10 extending between the first axial end and the primary outlet 10A. The secondary piston 12 is axially slidable within a second region extending between the primary outlet 10A and the secondary outlet 10B. The primary piston 11 and the secondary piston 12 each define an effective volume of the cylinder chamber 10 that is variable by the axial positioning of the pistons 11 and 12 in cooperation with the housing 15.

As shown as an example in FIG. 1, the master brake cylinder 1 further has an inlet plunger 6. The inlet plunger 6 is arranged coaxially with respect to the primary piston 11 and is guided so as to be axially slidable in the axial hole 14 of the primary piston 11. As shown as an example in FIG. 1, the inlet plunger 6 plunges into the cylinder chamber 10. The inlet plunger 6 may be particularly formed in a columnar shape as shown as an example in FIG. The inlet plunger has an optional shoulder 61 at the inner end section that plunges into the cylinder chamber 10. In a preferred manner, the inlet plunger 6 is axially slidable by an inlet rod 65 acting on the outer end section of the inlet plunger 6 located opposite the inner end section. The inlet rod 65 is used to connect the inlet plunger 6 to a brake pedal or brake lever of a vehicle (not shown). The inlet plunger 6 may be urged by the first spring 81 in the direction toward the inlet rod 65 along the axial direction. The first spring 81 may be supported, for example, by a secondary piston 12, as shown as an example in FIG. The secondary piston 12 may further be ... by a spring 84 of the secondary piston 12 located on the opposite side of the primary piston 11 and supported by the end wall of the housing 15.

In order to move the primary piston 11 in the axial direction, the master brake cylinder 1 has a spindle driving means 7. As shown as an example in FIG. 1, the spindle drive means 7 is particularly connected to, for example, a drive device 71 in the form of a motor, a spindle 73 that is axially slidable by the drive device 71, and a spindle 73. It may have a support plate 74. The drive device 71 may be connected to the spindle 73, in particular, via a spindle nut 72. The drive unit 71 and the spindle nut 72 are stationaryly arranged in relation to the housing 15. The spindle 73 has an external screw 73A. Since the spindle nut 72 corresponds to the external screw 73A of the spindle 73 and has an internal screw 72A that meshes with the external screw 73A, when the spindle nut 72 is rotated by the drive device 71, the spindle 73 is axially oriented. Move to. The spindle 73 is suitably arranged coaxially with the primary piston 11. In particular, the inlet rod 65 may extend coaxially through the inner hole 73B of the spindle 73, as shown as an example in FIG. As shown in FIG. 1 as an example, more optionally, the drive unit 71 is arranged coaxially with the spindle nut 72.

The support plate 74 is arranged at one end of the spindle 73 in the axial direction and extends in the radial direction orthogonal to the spindle 73. As shown as an example in FIG. 1, the support plate 74 is optionally guided by a single or multiple tension rods 75 extending axially in the outer region relative to the radial direction. .. Optionally, the support plate 74 has a central notch through which the inlet rod 65 projects. The support plate 74 may be further urged by the return spring 83 in the direction toward the spindle 73 along the axial direction. The return spring 83 may be supported, for example, by the housing 15 and the support plate 74 itself, as shown in FIG.

As schematically shown as an example in FIG. 1, a difference stroke sensor 86 is arranged on the support plate 74, particularly at a protrusion protruding in the axial direction from the support plate 74, and the difference stroke sensor 86 supports the support plate 74. It is provided to detect a change in the position of the inlet rod 65 relative to the plate 74. Since the difference stroke sensor 86 can be realized as an inductive sensor, for example, and the magnet element 86A can be arranged on the inlet rod 65, the difference stroke sensor 86 is based on the amount of movement of the inlet rod 65 in the axial direction. Detect changes in the magnetic field.

In the manual operation mode of the brake system 100, the driver can move the inlet rod 65 axially, for example by operating a brake pedal or a brake lever (not shown). This movement amount is detected by the difference stroke sensor 86, and the difference stroke sensor 86 generates a corresponding operation signal. Since the drive device 71 is operated by, for example, the control device 5 in response to the operation signal, the spindle 73 moves the support plate 74 and, by extension, the primary piston 11 supported by the support plate 74. As a result, the effective volume of the cylinder chamber 10 is reduced, and the hydraulic fluid (not shown) is pushed out of the cylinder chamber through the primary outlet 10A. The optional secondary piston 12 is also axially moved by the incompressible hydraulic fluid displaced by the primary piston 11 to pump the hydraulic fluid from the secondary outlet 10B as well.

Each wheel brake circuit 2A, 2B has at least one wheel brake cylinder 20. As shown as an example in FIG. 1, each wheel brake circuit 2A, 2B has two wheel brake cylinders 20 respectively. The wheel brake cylinder 20 is merely symbolically shown in FIG. The wheel brake cylinder 20 is operable by the hydraulic fluid and is provided to apply a force to the friction surface depending on the pressure of the hydraulic fluid. The pressure of a hydraulic fluid is called the braking pressure.

As more schematically shown in FIG. 1, the primary outlet 10A and optionally the secondary outlet 10B are each connected to one wheel brake circuit 2A, 2B via a switching valve 4, respectively. The switching valve 4 is preferably configured as a non-current open type solenoid valve. In the closed state, each switching valve 4 separates the primary outlet 10A and possibly the secondary outlet 10B of the master brake cylinder 1 from the wheel brake circuits 2A, 2B, that is, cuts off the fluid connection. In the open state shown as an example in FIG. 1, each switching valve 4 connects the primary outlet 10A and possibly the secondary outlet 10B of the master brake cylinder 1 to the wheel brake circuit 2, so that the hydraulic fluid is free. In order to increase the brake pressure, the cylinder chamber 10 may be pressure-fed to the wheel brake circuits 2A and 2B.

FIG. 1 further schematically shows the pressure conversion device 3. The pressure conversion device 3 has one pump device 31 including a single pump or a plurality of pumps for each wheel brake circuit 2. The pressure conversion device 3 further has a pump motor 30, which drives the pump device 31. The pump device 31 is provided to increase the pressure of the hydraulic fluid supplied to the inlet of the pump device to provide the outlet with the hydraulic fluid having the increased pressure with respect to the inlet.

As schematically shown in FIG. 1, the outlet of the pump device 31 is optionally connected to the singular or plural wheel brake cylinders 20 of each wheel brake circuit 2 via a wheel inlet valve 34. .. In particular, the wheel inlet valve 34 is arranged in the hydraulic flow path 40 extending between the switching valve 4 and the wheel brake cylinder 20. The inlet of the pump device 31 is also preferably connected to the wheel brake cylinder 20 via the wheel outlet valve 35 as shown in FIG. The wheel outlet valve 35 is particularly arranged in the hydraulic flow path 41 extending between the wheel brake cylinder 20 and the inlet of the pump device 31.

The wheel inlet valve 34 and the wheel outlet valve 35 can be realized as solenoid valves, respectively. The wheel inlet valve 34 is realized as a non-current open type solenoid valve in a suitable form. The wheel outlet valve 35 is realized as a non-current closed type solenoid valve in a suitable form. In FIG. 1, the wheel inlet valve 34 is shown in the open state and the wheel outlet valve 35 is shown in the closed state.

Further, as shown as an example in FIG. 1, an optional intermediate storage device 36 may be connected to the wheel brake circuit 2 via the wheel outlet valve 35. In FIG. 1, for example, a pressure accumulator connected to the hydraulic flow path 41 is shown as an intermediate storage device 36. As symbolically shown in FIG. 1, the accumulator has a spring-urged piston, which limits the pressure in the hydraulic flow path 41 to a predetermined limit by the spring constant of the spring. When it becomes smaller than the value, the hydraulic fluid existing in the intermediate storage device 36 is returned from the intermediate storage device 36 into the hydraulic flow path 41. Instead, the intermediate storage device 36 may be configured as a reservoir tank (not shown) internally controlled by ambient pressure. The reservoir tank is of the preferred form and is fluid-guidedly connected to the cylinder chamber 10 via an inlet 16, in which case a sniffer is located in the axial end region of the primary piston 11 opposite the spindle drive means 7. A hole 16A is formed in which the sniffer hole 16A opens the inlet 16 at the stopper position of the primary piston 11 so that the hydraulic fluid can be exchanged between the reservoir tank and the cylinder chamber 10. Such a reservoir tank may be additionally provided in the accumulator.

Each wheel brake circuit 2 is further provided with one high-voltage switching valve 9, and the high-voltage switching valve 9 may be configured as a non-current closed type solenoid valve in particular. In FIG. 1, the high pressure switching valve 9 is shown in a state of being symbolically closed. In the closed state, each high pressure switching valve 9 separates the primary outlet 10A and possibly the secondary outlet 10B of the master brake cylinder 1 from each wheel brake circuit 2. In the closed state, each high pressure switching valve 9 connects the primary outlet 10A of the master brake cylinder 1 and, in some cases, the secondary outlet 10B to each wheel brake circuit 2.

The control device 5 symbolically shown in FIG. 1 includes a spindle drive means 7, particularly a drive device 71 of the spindle drive means 7, a pump motor 30, a switching valve 4, a wheel inlet valve 34, a wheel outlet valve 35, and a brake system 100. It is functionally connected to the optional high-pressure switching valve 9 of. A functional connection is interpreted as a connection specifically provided for information transmission, such as a wired or wireless data connection. The control device 5 specifically has a control interface 50 for transmitting data or signals from the components of the brake system 100 and receiving them. Further, a vehicle interface 51 may be provided as an option, in which data or signals of a vehicle (not shown) can be received and transmitted to the vehicle. The control device 5 is particularly provided to provide an outlet signal based on the received inlet signal. For this purpose, the control device 5 specifically has a processor (not shown) and a non-volatile data memory (not shown).

In the manual operation mode described briefly, the control device 5 keeps the high pressure switching valve 9 in the closed state and keeps the switching valve 4 in the open state. The wheel inlet valve 34 is kept open. The wheel outlet valve 35 is kept closed. For example, by moving the inlet plunger 6 by the inlet rod 65 based on the operation of the driver, an operation signal is generated by, for example, the difference stroke sensor 86. Therefore, the operation signal represents the amount of movement of the inlet plunger 6 in the axial direction. The control device 5 includes a spindle drive means 7, particularly a drive device 71 of the spindle drive means 7, and optionally an additional pump motor 30, so that the wheel brake cylinder 20 adjusts the brake pressure depending on the operation signal. Drive to be operated. That is, in order to increase the braking pressure, the primary piston 11 and optionally the secondary piston 12 are axially moved in the direction of the outlets 10A, 10B by the spindle drive means 7, whereby the fluid is moved axially in each wheel brake circuit. It is pumped into the 2 and thereby raises the brake pressure. Further, the brake pressure can be increased by the pump device 31.

In the first operation mode, the control device 5 closes the switching valve 4 and the wheel brake cylinder 20 is operated to adjust the brake pressure depending on the operation signal indicating the axial movement amount of the inlet plunger 6. As such, the pump motor 30 is operated. The operating signal is provided, for example, by a differential stroke sensor 86 or another sensor, such as an absolute stroke sensor (not shown). The absolute stroke sensor is provided to provide a signal indicating the amount of movement of the inlet plunger 6 in the axial direction. Therefore, when the driver moves the inlet rod 65 and thus the inlet plunger 6, an operation signal indicating the driver's braking request is generated. The control device 5 calculates an adjustment signal from an operation signal using, for example, a calculation rule stored in a memory as software, and transmits this adjustment signal to the pump motor 30. The pump motor 30 appropriately operates the pump device 31 to adjust the desired brake pressure in the wheel brake cylinder 20.

In the first operation mode, the control device 5 causes the stroke-dependent reaction force according to the predetermined characteristics to oppose the axial movement amount of the inlet plunger 6 due to the axial movement of the primary piston 11. In addition, the spindle driving means 7 or the driving device 71 is operated. In particular, the axial motion of the primary piston 11 simulates the reaction force generated by the wheel brake cylinder 20 in a manual operating mode. The predetermined characteristics are generally represented by a change in the reaction force acting on the inlet plunger 6 depending on the axial movement distance of the inlet plunger 6. This reaction force can be adjusted by the amount of axial movement of the primary piston 11. This is because the switching valve 4 is closed. The control device 5 calculates an adjustment signal from an operation signal using, for example, a calculation rule stored in a memory as software, and uses this adjustment signal as a pressure predetermined in the cylinder chamber 10 in order to generate a reaction force. Is transmitted to the spindle drive means 7.

FIG. 1 shows the primary piston 11 at the stopper position as an example. At this position, the primary piston 11 is in contact with the support plate 74, and the support plate 74 is in contact with the spindle nut 72. As a result, the primary piston 11 has the maximum possible spacing with respect to the primary outlet 10A. As a result, the volume of the cylinder chamber 10 can no longer be increased by the primary piston 11. Therefore, the pressure in the cylinder chamber 10 can no longer be reduced by the axial movement of the primary piston 11. A signal generated by the control device 5 opens at least one switching valve 4 and a wheel outlet valve 35 in each wheel brake circuit 2 so that the desired characteristics of the reaction force can be further flexibly adjusted. Further, the control device 5 operates the spindle drive means 7 so that the support plate 74 moves away from the spindle nut 72, whereby the primary piston 11 moves out of the stopper position. As a result, the volume of the hydraulic fluid pushed away by the primary piston 11 moving out of the cylinder chamber is supplied to the intermediate storage device 36 via the wheel outlet valve 35. In this form, the required braking pressure is kept constant and the desired pedal feel for the driver is simulated.

In the second operation mode, the switching valve 4 is opened by the corresponding signal of the control device, the spindle drive means 7 and / or the pump motor 30 is controlled by the control device 5 according to the vehicle control signal, and the wheel brake cylinder 20 is the vehicle control signal. It is operated to be operated to adjust the braking pressure depending on the. In this case, the control signal is provided to the control device 5 by a predetermined vehicle interface 51. Thereby, in the second driving mode, the signal representing the braking request is not provided by the driver's operation of the inlet plunger 6 but is based on the route data during autonomous driving of an external signal generator, such as the vehicle. Provided by the vehicle's onboard computer (not shown) to generate control signals. In this case, the control device 5 controls the spindle drive means 7 and the pump motor 30 in the above manner based on the manual operation mode.

Optionally, in the second operating mode, the volume change in the cylinder chamber 10 caused by the axial movement of the inlet plunger 6 is compensated for by the opposing axial movement of the primary piston 11. , The spindle drive means 7 may be operated. That is, if the driver moves the inlet plunger 6 in the axial direction, for example by manipulating the inlet rod, even though the brake system 100 is in the second mode of operation, this is, for example, by the differential stroke sensor 86 or other sensor. Although detectable, the primary piston 11 is moved so that the effective volume of the cylinder chamber 10 is kept constant. This prevents the driver from making unintended changes in braking pressure.

When the primary piston 11 is in the stopper position during operation of the brake system 100 in the second mode of operation, the control device 5 opens at least one switching valve 4 and the wheel outlet valve 35 of the corresponding brake circuit to open the primary piston. The spindle drive means 7 is operated so that the 11 moves out of the stopper position, whereby the volume displaced by the inlet plunger 6 and / or the primary piston 11 is supplied to the intermediate storage device 36.

FIG. 2 shows another master brake cylinder 1 as an example. In this master brake cylinder 1, in particular to the master brake cylinder 1 shown in FIG. 1, a first spring 81 that urges the inlet plunger 6 toward the inlet rod 65 along the axial direction is attached to the primary piston 11. The point of being supported is different. As shown as an example in FIG. 2, the inlet plunger 6 has a stopper 62 that projects radially into the outer end section located opposite the inner end section with the optional shoulder 61. The first spring 81 presses the stopper 62. As shown as an example in FIG. 2, the stopper 62 is particularly configured to be hat-shaped or sleeve-shaped.

Optionally, FIG. 2 is further provided with a second spring 82 that urges the primary piston 11 axially toward the support plate 74. The second spring 82 is arranged on the side of the primary piston 11 opposite to the support plate 74. In particular, as shown as an example in FIG. 2, the second spring 82 may be arranged between the primary piston 11 and the secondary piston 12 and supported by the secondary piston 12.

FIG. 3 shows another master brake cylinder 1 as an example. The master brake cylinder 1 is configured in the same manner as the master brake cylinder 1 shown in FIG. 2, and in particular, the return spring 83 directly presses the support plate 74 with respect to the master brake cylinder shown in FIG. Instead, it differs in that it presses the radial shoulder 13 of the primary piston 11. As shown in FIG. 3, the radial shoulder 13 of the primary piston 11 extends radially from the primary piston 11 and preferably faces the support plate 74 at the end section of the primary piston 11. Have been placed.

Although the present invention has been specifically described with reference to the plurality of examples, the present invention is not limited to these examples and can be improved in various forms. In particular, a combination of the plurality of examples is also conceivable.

1 Master brake cylinder 2 Wheel brake circuit 2A 1st wheel brake circuit 2B 2nd wheel brake circuit 3 Pressure converter 4 Switching valve 5 Control device 6 Inlet plunger 7 Spindle drive means 9 High pressure switching valve 10 Cylinder chamber 10A Primary outlet 10B Secondary Outlet 11 Primary Piston 12 Secondary Piston 13 Radial Shoulder 14 Axial Hole 15 Housing 15A First Axial End 15B Second Axial End 16 Inlet 16A Sniffer Hole 20 Wheel Brake Cylinder 30 Pump Motor 31 Pump device 34 Wheel inlet valve 35 Wheel outlet valve 36 Intermediate storage device 40, 41 Hydraulic flow path 50 Control interface 51 Vehicle interface 61 Shoulder 62 Stopper 65 Inlet rod 71 Drive device 72 Spindle nut 72A Internal thread 73 Spindle 73A External thread 73B Inner hole 74 Support plate 81 1st spring 82 2nd spring 83 Return spring 84 Spring 86 Difference stroke sensor 86A Magnet element 100 Brake system

Claims (10)

In the braking system (100) for vehicles
A primary piston (11) that is axially slidable in a cylinder chamber (10) having a primary outlet (10A) and is provided to plunge into the cylinder chamber (10) and connect to a brake pedal. , An inlet plunger (6) that can be pivotally swung within the primary piston (11) and a spindle drive connected to the primary piston (11) for axially manipulating the primary piston (11). It has a master brake cylinder (1) with means (7) and
It has a wheel brake circuit (2) with at least one wheel brake cylinder (20).
It has a pressure conversion device (3) including a pump motor (30) and a pump device (31) connected to the wheel brake cylinder (20) driven by the pump motor (30).
The primary outlet (10A) of the master brake cylinder (1) is separated from the wheel brake circuit (2) in the closed state, and the primary outlet (10A) of the master brake cylinder (1) is separated from the wheel brake circuit (2) in the open state. It has a switching valve (4) that connects to the circuit (2).
It has a control device (5), the control device (5) closes the switching valve (4) in the first operation mode, and the pump motor (30) is used with the wheel brake cylinder (20). ) Is provided to operate the inlet plunger (6) so as to be operated depending on an operation signal representing the amount of axial movement of the inlet plunger (6) in order to adjust the brake pressure, and further, the master brake cylinder (1). The spindle driving means (7) is subjected to a stroke-dependent reaction force according to a predetermined characteristic against the axial movement of the inlet plunger (6) due to the axial movement of the primary piston (11). A brake system (100) provided for driving to act. The outlet of the pump device (31) is connected to the wheel brake cylinder (20) via the wheel inlet valve (34), and the inlet of the pump device (31) is connected to the wheel outlet valve (35) via the wheel outlet valve (35). It is connected to the wheel brake cylinder (20) and the intermediate storage device (36) is connected to the wheel brake circuit (2) via the wheel outlet valve (35), in which case the control device (5). ) Is in the first operating mode, when the primary piston (11) is in a stopper position where the volume of the cylinder chamber (10) can no longer be increased by the primary piston (11). (4) and the wheel outlet valve (35) are opened, and the spindle driving means (7) is moved away from the stopper position by the primary piston (11), whereby the inlet plunger (6) and the inlet plunger (6) and the inlet plunger (6) are moved. / Or the brake system (100) of claim 1, provided for operation such that the volume displaced by the primary piston (11) is supplied to the intermediate storage device (36). In the second operation mode, the control device (5) opens the switching valve (4) and causes the spindle drive means (7) and / or the pump motor (30) to follow the vehicle control signal to the wheel. The brake cylinder (20) is provided to operate to adjust the brake pressure depending on the vehicle control signal, in which case the control signal is provided to connect to the vehicle. The brake system (100) according to claim 1 or 2, provided by the vehicle interface (51) of the control device (5). The control device (5) changes the volume of the cylinder chamber (10) caused by the axial movement of the inlet plunger (6) in the spindle driving means (7) in the second operation mode. The brake system (100) according to any one of claims 1 to 3, wherein the brake system (11) is operated so as to be corrected by the reverse axial movement of the primary piston (11). The control device (5) is in the second operating mode when the primary piston (11) is in a stopper position where the volume of the cylinder chamber (10) can no longer be increased by the primary piston (11). The switching valve (4) and the wheel outlet valve (35) are opened, and the spindle driving means (7) is moved out of the stopper position of the primary piston (11), whereby the inlet is moved. The brake according to claim 3 or 4, which is provided for operation so that the volume displaced by the plunger (6) and / or the primary piston (11) is supplied to the intermediate storage device (36). System (100). The inlet plunger (6) is slidable by an inlet rod (65), and the inlet plunger (6) is preferably said by a first spring (81) supported by the primary piston (11). The brake system (100) according to any one of claims 1 to 5, which is urged toward the inlet rod (65). The spindle driving means (7) is connected to a driving device (71), a spindle (73) that can be swung in the axial direction by the driving device (71), and a support plate (74) connected to the spindle (73). In this case, preferably, the primary piston (11) is urged by a second spring (82) in a direction toward the support plate, any of claims 1 to 6. The brake system (100) according to item 1. The support plate (74) is urged by a return spring (83) supported by a housing (15) defining the cylinder chamber (10), in which case the return spring (83) is further said. The brake system (100) according to claim 7, wherein the brake system (100) is supported by a support plate (74) or a radial shoulder (13) of the primary piston (11). The master cylinder (1) is configured as a tandem cylinder and has a secondary piston (12) in addition to the primary piston (11), wherein the secondary piston (12) is the primary outlet (12). The brake system according to any one of claims 1 to 8, which is located between 10A) and the secondary outlet (10B) and is axially slidable within the region of the cylinder chamber (10). (100). In the method for operating the brake system (100) according to any one of claims 1 to 9.
A step of moving the inlet plunger (6) in the axial direction, and at this time, in the first operation mode, a step of generating an operation signal representing the amount of movement of the inlet plunger (6) in the axial direction.
The step of closing the switching valve (4) and
A step of operating the pump motor (30) so that the wheel brake cylinder (20) is operated depending on the operation signal.
A stroke-dependent reaction force according to a predetermined characteristic acts against the axial movement of the inlet plunger (6) due to the axial movement of the primary piston (11) of the master brake cylinder. The step of operating the spindle drive means (7) and
A method for driving a brake system (100).

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