Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
  • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
  • B60T8/4081—Systems with stroke simulating devices for driver input
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
  • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
  • B60T13/66—Electrical control in fluid-pressure brake systems
  • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
  • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
  • B60T13/66—Electrical control in fluid-pressure brake systems
  • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
  • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
  • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
  • B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T7/00—Brake-action initiating means
  • B60T7/02—Brake-action initiating means for personal initiation
  • B60T7/04—Brake-action initiating means for personal initiation foot actuated
  • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors

Definitions

• the invention relates to a method according to the preamble of claim 1 and a brake system according to the preamble of claim 9.
• hydraulic vehicle brake systems which are designed as power-brake systems and in addition to a muscle-operated master cylinder, are hydraulically connected to the wheel brakes and provides the pressure and volume for actuating wheel brakes, include a further, electrically controllable pressure and volume delivery device in a "brake In the event of failure of the electrically controllable pressure and volume supply device, the wheel brakes are actuated solely by the muscular force of the vehicle driver.
• Brake system with a brake pedal operable master cylinder, a waysimulator and a pressure supply device known.
• the wheel brakes are pressurized in a "brake-by-wire" mode by the pressure delivery device, the master cylinder and thus the driver are separated from the wheel brakes via closed isolating valves, thus providing the driver with brake control in the event of anti-lock control -by-wire "mode no brake pedal feedback.
• the invention is based on the idea to use for haptic information of the driver connected to the pressure chamber of the master cylinder ⁇ release valve, by means of which the simulation device, or in other words the effect of the simulation device, on and off. It is thus carried out in the presence of a predetermined operating condition by means of the release valve a brake pedal reaction.
• the invention offers the advantage of employing a simulator release valve, which is frequently present in a brake-by-wire brake system with a brake pedal feel simulator, for the driver's haptic information, thereby enabling a cost-effective haptic information channel to the driver.
• the method in particular the processing performed by the connected to the pressure chamber of the master brake cylinder release ⁇ valve brake pedal reaction, "ke-by-wire flying colors" in a; mode is preferably carried out, in which the driver separately decoupled from the wheel brakes of the brake system hydraulic or is.
• the brake pedal feedback is preferably performed in the form of a change in the driver's perceived stiffness of the brake pedal.
• the brake pedal reaction by means of the release valve at the beginning an antilock control or an electronic brake force distribution function performed so that the driver is informed of the onset of the control or the function.
• the brake pedal feedback is applied immediately at the beginning of anti-skid control or an electronic braking force distribution function, i. upon entry into the anti-skid control or braking force distribution function, in order to allow the driver to drive directly, e.g. about the blocking limit of the wheel (s).
• the brake pedal reaction when an inlet valve of a wheel brake is closed in a "flying colors ke-by-wire" mode is preferably carried out by means of the Release Certificates ⁇ beventils.
• the initial closing of the intake valve via the brake pedal is particularly preferably directly confirmed.
• the brake pedal reaction by means of Release valve is particularly preferably performed when in the "brake-by-wire" mode during a brake pedal operation, the inlet valve is closed.
• a brake pedal reaction when closing an intake valve by a brake function eg ABS (anti-lock control) or EBV (electronic brake force distribution) of the brake system is performed.
• the invention preferably relates to a method for setting a suitable brake pedal feedback for the driver during an ABS control.
• the simulation device generates a basic brake pedal characteristic by means of a passive simulator spring, which assigns a pedal travel to a given pedal force in unchanged constant relation.
• the release valve is preferred partially and / or temporarily closed. As a result, the rigidity in the brake pedal is increased in a simple manner.
• the flow resistance of the release valve is preferably varied.
• the master cylinder in the "brake-by-wire" mode, is separated from the brake circuit (s), for example by means of one or more isolation valves.
• the pressure chamber of the master cylinder via the release valve with the simulation device is hydraulically connected or connectable.
• the pressure chamber of the main ⁇ brake cylinder is hydraulically connected via the release valve with a standing under Atmo ⁇ spherical pressure pressure fluid reservoir or connectable.
• the invention relates to a method for operating a brake system for motor vehicles, which can be controlled in a "brake-by-wire" mode both by the driver and independently of the driver, preferably in the "brake-by-wire” mode is operated and can be operated in at least one fallback mode.
• the invention also relates to a brake system in which a method according to the invention it ⁇ is performed.
• the brake system preferably comprises an electrically actuatable, in particular normally open, intake valve per wheel brake for setting wheel-specific brake pressures.
• the brake system further comprises an electric operable, in particular normally closed, the outlet valve ⁇ each wheel brake for adjusting wheel-individual brake pressures.
• the brake system comprises a master cylinder with a housing and two pistons defining two pressure chambers in the housing, to each of which a brake circuit with wheel brakes can be connected or connected.
• the brake system preferably comprises an electrically controllable pressure supply device, which is connected or connectable to the, in particular each, brake circuit.
• the brake system comprises an electrically operable, in particular normally closed, Zuschaltventil ever
• Brake circuit for the hydraulic connection of the pressure supply device with the brake circuit.
• the simulation device is hydraulically connected or connectable to at least one pressure chamber of the master brake cylinder.
• the pressure chamber of the master brake cylinder via the release valve with the simulation device is hydraulically connected or connectable.
• the simulation device is connected or connectable to an annular hydraulic chamber of the master cylinder, wherein a Druckbe ⁇ aufschlagung the chamber causes a force against the actuation direction on the brake pedal operated piston of the master cylinder.
• the pressure chamber of the master cylinder is preferably hydraulically connected via the release valve with a pressure medium reservoir under atmospheric pressure or
• the electronic control unit of the brake system is preferably designed to control the release valve.
• the electronic control and regulating ⁇ unit in addition to controlling the Drucklekes- device, the isolation valves, the Zuschaltventile and the valve executed.
• FIG. 1 shows a first embodiment of a brake system according to the invention for carrying out a method according to the invention
• FIG. 2 shows a detail of a second embodiment of a brake system according to the invention for carrying out a method according to the invention
• Fig. 3 shows a detail of a third embodiment of a brake system according to the invention for carrying out a method according to the invention.
• the brake system essentially comprises an actuatable by means of an actuating or brake pedal 1 hydraulic actuation unit 2, a travel simulator or simulation device 3 acting together with the hydraulic actuation unit 2, an accumulator tank 4 assigned to the hydraulic actuation unit 2 and under atmospheric pressure, an electrically controllable one
• Pressure supply device 5 and an electrically controllable pressure modulation device for setting wheel-specific brake pressures. Furthermore, the brake system comprises an electronic control unit 12.
• the unspecified pressure modulating means comprises, for example according to each wheel brake 8, 9, 10, 11 of a non Darge ⁇ presented motor vehicle, an intake valve 6a-6d and an exhaust valve 7a-7d, which in pairs hydraulically interconnected via center terminals and to the wheel brakes 8, 9, 10, 11 are connected.
• the inlet ports of the inlet valves 6a-6d are supplied with pressure via brake circuit supply lines 13a, 13b, which are derived in a "brake-by-wire" mode from a system pressure in a system pressure line 38 connected to a pressure chamber 37 of the electrically controllable pressure supply device 5
• brake circuit supply lines 13a, 13b which are derived in a "brake-by-wire" mode from a system pressure in a system pressure line 38 connected to a pressure chamber 37 of the electrically controllable pressure supply device 5
• a check valve 50a-50d opening toward the brake circuit supply lines 13a, 13b is connected in parallel with the inlet valves 6a-6d, so that the pressure in a wheel brake circuit 43 during normal operation is never higher than the pressure in the pressure chamber 37.
• the brake circuit supply lines 13a, 13b are supplied with the pressures of the pressure chambers 17, 18 of the actuating unit 2 via hydraulic lines 22a, 22b If the system pressure prevails, a preferably redundant pressure sensor 19 is provided.
• the hydraulic actuator 2 has in a housing 21 on two serially arranged pistons 15, 16, limit the hyd ⁇ raulische chambers or pressure chambers 17, 18, which together with the pistons 15, 16 a dual-circuit master brake cylinder or a tandem master cylinder.
• the pressure chambers 17, 18 are on the one hand in the piston 15, 16 formed radial bores and corresponding pressure equalization lines 41a, 41b with the pressure medium reservoir 4 in connection, which can be shut off by a relative movement of the piston 15, 16 in the housing 21, and on the other hand by means of hydraulic lines 22a, 22b with the already mentioned brake circuit supply lines 13a, 13b in connection.
• the pressure chambers 17, 18 take unspecified return springs, which position the pistons 15, 16 when the master cylinder 2 is not actuated in a starting position.
• a piston rod 24 couples the pivoting movement of the brake pedal 1 due to a pedal operation with the
• the corresponding piston travel signal is a measure of the brake pedal actuation angle. It represents a braking request of a driver.
• Simulation device 3 is, for example, hydraulically coupled to master brake cylinder 2 and consists essentially of a simulator chamber 29, a simulator spring chamber 30 and a two chambers 29, 30 separated from each other
• Simulator piston 31 simulant piston 31 is supported by a arranged in Simulatorfederhunt 30 elastic element (eg, a spring), which is advantageously biased on the housing 21 from.
• the simulator chamber 29 can be connected to the first pressure chamber 17 of the tandem master cylinder 2 by means of an electrically actuated, advantageously normally closed, (simulator) release valve 32.
• an electrically actuated, advantageously normally closed, (simulator) release valve 32 Upon specification of a pedal force and activated (Simula ⁇ tor) release valve 32 pressure fluid flows from Hauptbremszy- cylinder pressure chamber 17 in the simulator chamber 29.
• a non-parallel to the release valve 32 arranged check valve ⁇ 34 allows independent of the switching state of the free ⁇ gabeventils 32 a largely unhindered Backflow of the pressure medium from the simulator chamber 29 to the master cylinder pressure chamber 17. Simulation device 3 can therefore be switched on and off by means of the release valve 32.
• the electrically controllable pressure supply device 5 is designed as a hydraulic cylinder-piston arrangement or a single-circuit electrohydraulic actuator whose piston 36 is actuated by a schematically indicated electric motor 35 with the interposition of a rotationally-translational gearbox also shown schematically.
• a schematically indicated electric motor 35 with the interposition of a rotationally-translational gearbox also shown schematically.
• One of the detection of the rotor position of the electric motor 35 serving, only schematically indicated rotor position sensor is designated by the reference numeral 44.
• a temperature sensor for sensing the temperature of the motor winding may also be used.
• the piston 36 defines a pressure chamber 37.
• the actuator pressure generated by the force effect of the piston 36 on the pressure medium enclosed in the pressure chamber 37 actuator pressure is fed into the system pressure line 38 and detected with the system pressure sensor 19.
• the system pressure line 38 is connected to the brake circuit supply lines 13a, 13b via the connection valves 26a, 26b 11.
• the pressure medium previously displaced from the pressure chamber 37 of the actuator 5 into the wheel brakes 8, 9, 10, 11 flows back into the pressure chamber 37 of the actuator 5 in the same way , with the help of the modulation valves 6a-6d, 7a-7d controlled wheel brake the discharged via the outlet valves 7a-7d pressure medium content in the pressure fluid reservoir 4.
• a sucking of pressure medium in the pressure chamber 37 is possible by a return of the piston 36 with closed Zuschaltventilen 26a, 26b in that pressure medium exits from the container 4 via a non-return valve which opens in the flow direction to the actuator formed Nachsaugventil 52 in the
• Akuatordruckraum 37 can flow.
• the control of the electrically actuatable components of the brake system in particular the valves 6a-6d, 7a-7d, 23a, 23b, 26a, 26b, 28, 32 and the electric motor 35 of the Druck washers ⁇ positioning device 5, the electronic control unit 12 is used.
• the signals from the sensors 19, 20, 25 and 44 are also ver ⁇ works in the electronic control unit 12.
• master cylinder 2 In a normal brake function of the brake system ("brake-by-wire" mode) master cylinder 2, and thus the driver, from the wheel brakes 8, 9, 10, 11 decoupled by the closed separating valves 23 a, 23 b and the
• Brake circuit supply lines 13a, 13b are connected via the open connection valves 26a, 26b to the pressure supply device 5, which provides the system pressure for actuating the wheel brakes 8, 9, 10, 11.
• Simulation device 3 is closed by the open (simulator) release valve 32, so that the pressure medium volume displaced by the operation of the brake pedal 1 by the driver in the master cylinder 2 is received by the simulation device 3 and the simulation device 3 gives the vehicle driver a familiar brake pedal feel.
• a brake pressure reduction in the wheel brakes 8, 9, 10, 11 can be done by the piston 36 of the pressure supply device 5 is again driven in the direction of the rest position (to the right in Fig. 1). A faster, e.g.
• the driver is thus disconnected from the wheel brake circuits 43 during active operation (ie in the "brake-by-wire” mode) by the isolation valves 23a, 23b, thus giving the driver no haptic brake pedal reaction even at the beginning of an antilock control closing an intake valve 6a-6d.
• ABS / ESC brake system noticeable to the driver in the brake pedal.
• a Bremspe ⁇ dalschreibrial is performed, for example, in the presence of a predetermined operating condition by means of the pressure chamber of the master cylinder associated release valve 32.
• Ver ⁇ averaging of the information of the, in particular initial
• the release valve 32 is preferably a valve, by means of which the fluid flowing out of a pressure chamber (eg, pressure chamber 17 in FIG. 1) of the master brake cylinder during a brake pedal actuation (in particular in the "brake-by-wire" mode) Pressure fluid changed or an outflow resistance of the main ⁇ brake cylinder can be varied.
• a pressure chamber eg, pressure chamber 17 in FIG. 1
• the flow resistance of the valve 32 is increased or varied, which leads to the increase in stiffness on the brake pedal 1.
• FIG. 2 shows a section of a second exemplary embodiment of a brake system according to the invention for carrying out a method according to the invention.
• Fig. 2 substantially the master cylinder 2 with brake pedal 1, the simulation device 3, the pressure medium reservoir 4 and the separating valves 23 a, 23 b are shown.
• the second embodiment largely corresponds to the first embodiment, wherein in the pressure equalization line 41a, however, no diagnostic valve 28 is provided with parallel check valve 27.
• the first pressure chamber 17 of the master cylinder 2 with the simulator chamber 29 of Si is mulations dressed 3 hydraulically connected via an electrically actuable (simulator) enabling valve 32 with parallel ge ⁇ switched off check valve 34 so that Simulati ⁇ ons liked 3 by means of the release valve 32 can be switched on and off ⁇ .
• FIG. 3 shows a section of a third exemplary embodiment of a brake system according to the invention for carrying out a method according to the invention.
• essentially the master brake cylinder 2 with brake pedal 1, the simulation device 3, the pressure medium reservoir 4 and the isolation valves 23a, 23b are shown.
• Master brake cylinder 2 has two hydraulic master cylinder pistons 15, 16 arranged one behind the other, which limit the pressure of the pressure chambers 17, 18.
• the pressure chambers 17, 18 are on the one hand in the master cylinder piston 15, 16 formed radial bores and corresponding Druckaus ⁇ equal lines 41a, 41b with the pressure medium reservoir 4 in connection, which can be shut off by a relative movement of the pistons 15, 16, and on the other hand by means of hydraulic lines 22a, 22b communicate with the isolation valves 23a, 23b.
• first main ⁇ cylinder piston 15 is for example in accordance with as a stepped piston with a circular area 46 and an annular surface 47 formed with the circular surface 46 of the first pressure chamber 17 and the annular surface of a hydraulic chamber 45 limited 47th
• a pressure effect in the chamber 45 corresponds to a force acting on the first master cylinder piston 15 counter to the actuating direction.
• the first pressure chamber 17 and the hydraulic chamber 45 are hydraulically sealed against each other.
• Simulation device 3 consists essentially of a simulator chamber 29, a simulator spring chamber 30 and a simulator piston 31 separating the two chambers 29, 30 from each other. Simulator piston 31 is supported by a simulator piston 31
• Simulator spring chamber 30 disposed elastic member (e.g., a spring) on the housing.
• Simulator chamber 29 is, for example, on the one hand with the pressure fluid reservoir 4 (or the pressure equalization line 41a to the pressure fluid reservoir 4) by means of an electrically operable, advantageously normally open, valve 42 with a parallel connected (in the direction of the pressure medium reservoir closing) check valve 40, and on the other with the annular chamber 45 of the master cylinder 2 connected.
• the pressure chamber 17 of the master cylinder 2 is according to the example with the pressure medium reservoir 4 (or the pressure equalization line 41a to the pressure medium reservoir 4) via a electrically actuated, advantageously currentless ⁇ closed, release valve 32 ⁇ connected.
• release ⁇ valve 32 ⁇ By means of release ⁇ valve 32 ⁇ , the simulation device 3 is switched on and off.
• the closed release valve 32 ⁇ of the piston 15 of the master cylinder 2 is not displaced when a brake pedal actuation, and thus the simulation means 3 is switched off.
• an open release valve 32 ⁇ the piston 15 of the master cylinder 2 can be moved at a brake pedal operation, so that when the valve is closed 42nd
• Pressure medium is moved into the simulator chamber 29 of the simulation device 3, wherein the known brake pedal feeling is mediated.
• exemplary brake system is in the presence of a predetermined operating condition by means of connected to the pressure chamber of the master cylinder release valve 32 ⁇ a brake pedal feedback performed.
• Pressure chamber 17 of the master cylinder 2 changes flowing pressure medium or an outflow resistance of the master cylinder 2 varies.
• the flow resistance of the valve 32 ⁇ is increased or varied, which leads to the increase in rigidity on the brake pedal 1.
• Brake pedal operation e.g. the beginning of a
• ABS Antilock brake control
• EBV electronic brake force distribution function
• An advantage of the invention described is that for the haptic brake pedal feedback no additional actuator such as e.g. a soiraktuator in the pedal simulator unit or the brake pedal is needed.
• the function can be implemented purely via software.
• release valve 32 and 32 ⁇ is a valve for switching on and off of the simulation device or the brake pedal characteristic of the simulation device.

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• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Regulating Braking Force (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

Country Status (6)

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• 2013
  • 2013-11-04 DE DE102013222281.5A patent/DE102013222281A1/de not_active Withdrawn
• 2014
  • 2014-03-05 KR KR1020157033585A patent/KR20160003780A/ko not_active Application Discontinuation
  • 2014-03-05 EP EP14708247.3A patent/EP2991864A1/de not_active Withdrawn
  • 2014-03-05 US US14/888,508 patent/US9845085B2/en not_active Expired - Fee Related
  • 2014-03-05 WO PCT/EP2014/054252 patent/WO2014177307A1/de active Application Filing
  • 2014-03-05 CN CN201480024442.8A patent/CN105163987B/zh not_active Expired - Fee Related

Non-Patent Citations (2)

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