CN112406829B - Active brake pedal stroke simulator and control method thereof - Google Patents
Active brake pedal stroke simulator and control method thereof Download PDFInfo
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- CN112406829B CN112406829B CN202011457204.XA CN202011457204A CN112406829B CN 112406829 B CN112406829 B CN 112406829B CN 202011457204 A CN202011457204 A CN 202011457204A CN 112406829 B CN112406829 B CN 112406829B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 238000005192 partition Methods 0.000 claims abstract description 41
- 238000007789 sealing Methods 0.000 claims description 22
- 238000004088 simulation Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 20
- 230000033001 locomotion Effects 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 16
- 230000006837 decompression Effects 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000418 atomic force spectrum Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- 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
- B60T8/409—Systems with stroke simulating devices for driver input characterised by details of the stroke simulating device
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- 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
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- 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
- B60T13/746—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 and mechanical transmission of the braking action
Abstract
The invention discloses an active brake pedal stroke simulator and a control method thereof, and aims to solve the problems that the performance requirement on a hydraulic adjusting unit is too high and the utilization of the existing components is insufficient in the prior art. The simulator comprises a simulator driving mechanism and a simulator executing mechanism. The simulator driving mechanism comprises a motor controller, a motor, a driving gear, a toothed internal circulation nut, a ball, a screw mandrel, a thrust bearing, a limit switch, a rear cover and a partition plate. The simulator actuating mechanism comprises a second piston, a second piston spring, a first piston spring, a third piston spring seat and a simulator cylinder. The simulator cylinder body is connected with the partition board through three partition board connecting bolts, the rear cover is connected with the partition board through seven rear cover connecting rivets, the motor is connected with the partition board through two motor fixing bolts, and the third piston is sleeved on the sliding rod part of the screw rod ejector rod. The invention also provides a control method.
Description
Technical Field
The invention relates to an active brake pedal stroke simulator applied to the field of automobile brake systems, in particular to an active brake pedal stroke simulator and a control method thereof.
Background
In recent years, with the progress of artificial intelligence technology, it has become possible to use a robot instead of a human to complete driving tasks, and unmanned vehicles tend to become one of the development trends of future automobile technologies, and intelligent driving systems eventually replace human to drive automobiles. The advent of intelligent driving systems has put forward new and higher demands on braking systems, and newly introduced intelligent driving functions require that the braking systems can realize brake-by-wire through instructions, and the braking systems are guaranteed to have higher availability, and all key functions including brake-by-wire have redundant backups, and are not limited to traditional conventional brake mechanical backups. These needs have not been met by currently available brake systems, and in order to meet these needs, the brake-by-wire system components should have a higher pressure regulating capability while the pedal travel simulation function should be incorporated so that the brake pedal of the brake-by-wire system still has a pedal feel that approximates that of a conventional brake pedal.
In order to solve the problem, foreign manufacturers and research institutions usually complete redesign of the hydraulic brake system, such as the macner power transmission system share and the chinese patent publication number of the two companies is CN101927758A, the publication date is 12 months 29 in 2010, and the invention is named as "brake pedal simulator and brake system"; chinese patent publication number CN102066167a, publication date 2011, 5 month 18, and entitled "travel simulator and brake control device"; the publication number of the Chinese patent of the Robert Boshi Co., ltd is CN102256842A, the publication date is 11 months and 23 days in 2011, the invention is named as a brake booster which works as a pedal simulator and is correspondingly designed, and the invention is named as a stroke simulator with the publication number of China patent publication No. CN102582595A of Pi Jiate, the publication date of 2012, 7 and 18.
For domestic automobile manufacturers, because of relatively deficient component resources and technology, the complete redesign of the hydraulic braking system is difficult, long in period and high in cost, and is unfavorable for market competition. At present, only the Zhejiang Tai electromechanical Co., ltd in China has the Chinese patent publication (notice) number of CN101879891A, the publication (notice) day of 11 months in 2010 and 10 days, and the Chinese patent application number of CN201010214778.4, the name of which is an automobile brake pedal feel simulator; the Chinese patent publication (notice) number is CN102294997A, the publication (notice) day is 2011, 12 months and 28 days, the Chinese patent application number is CN201110160378.4, the name of the invention is an automobile brake pedal feel simulator, and two improvement schemes based on the existing hydraulic brake system are provided. When the two schemes realize pressure adjustment, the performance requirement on the hydraulic adjusting unit exceeds the capability of the existing product, and the utilization of the existing component resources is still insufficient.
Therefore, it is necessary to develop a device that can implement the active pressure adjustment function and the pedal feel simulation function to complete the braking process in conjunction with the brake-by-wire system without significantly modifying the components of the original hydraulic brake system. Therefore, on one hand, the functional requirement of the brake-by-wire system can be met, and meanwhile, the research and development and production cost can be reduced, and the research and development period is shortened.
Disclosure of Invention
The invention aims to solve the technical problems that the performance requirement on a hydraulic adjusting unit exceeds the capability of the existing product and the utilization of the existing component resources is still insufficient in the prior art, and provides an active brake pedal stroke simulator and a control method thereof.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
the active brake pedal stroke simulator comprises a simulator driving mechanism and a simulator executing mechanism; the simulator driving mechanism comprises a motor controller, a motor, a driving gear, a toothed internal circulation nut, a ball, a screw mandrel, a limit switch, a rear cover, a partition plate, a first thrust bearing and a second thrust bearing; the simulator actuating mechanism comprises a second piston, a second piston spring, a second piston sealing ring, a first piston spring, a third piston spring seat retainer ring, a third piston sealing ring and a simulator cylinder;
the simulator cylinder body is arranged on the right end face of the partition board through bolts, the rear cover is arranged on the left end face of the partition board through rivets, the toothed internal circulation nut is arranged between the rear cover and the partition board through a first thrust bearing and a second thrust bearing, the left end of the screw rod ejector rod is arranged in a central hole of the toothed internal circulation nut for rolling connection, the right end of the screw rod ejector rod is inserted into a stepped hole of the simulator cylinder body, the right end of the screw rod ejector rod is sleeved with a third piston, the left end of the third piston is sleeved with a second piston, the right end of the third piston is sleeved with a first piston, the third piston spring and the third piston spring seat are sequentially sleeved with a third piston, a third piston spring seat retainer ring is arranged in a circular groove at the left end of the third piston, the second piston is sleeved with a first section of the simulator cylinder body, the first piston is sleeved with a second piston spring, the first piston is sleeved with a second section of the simulator cylinder body, the first piston is sleeved with the first piston, the motor is arranged on the stepped hole, the motor is sleeved with a motor, the right end face of the lower than the simulator cylinder body is sleeved with a motor, the motor is in interference fit with a motor, the motor is in a control wire, the motor is meshed with the motor, the motor is connected with the motor, and the motor is in a limit switch, and the limit switch is connected with the motor through the drive wire, and the limit switch is meshed with the motor.
The technical scheme is that the toothed internal circulation nut is a disc-type structural member, a cylindrical boss is arranged at the right end of the toothed internal circulation nut, the center of the boss coincides with the center of the toothed internal circulation nut, teeth meshed with the driving gear are arranged on the outer cylindrical surface of the toothed internal circulation nut, a central through hole is formed in the center of the toothed internal circulation nut, and a spiral rollaway nest for installing balls is arranged on the inner cylindrical surface of the central through hole.
The screw mandrel in the technical scheme consists of a left section and a right section, wherein the left section is a screw mandrel which is matched with a central through hole of a toothed internal circulation nut and a ball and is provided with a spiral rollaway nest, and the right section is a cylindrical slide bar with a smooth surface; the rolling connection of the left end of the screw mandrel and the central hole of the internal circulation nut with teeth is that: the spiral rollaway nest on the center through hole of the inner circulation nut with teeth and the spiral rollaway nest on the screw rod in the screw rod ejector rod are filled with balls.
According to the technical scheme, a second thrust bearing is sleeved on a boss at the right end of the toothed internal circulation nut and is in contact connection, the right end face of the toothed internal circulation nut is in contact connection with the left end face of the second thrust bearing, the second thrust bearing is sleeved on a circular boss on the left end face of the partition plate and is in contact connection, the right end face of the second thrust bearing is in contact connection with the left end face of the partition plate, the left end face of the toothed internal circulation nut is in contact connection with the right end face of the first thrust bearing, the first thrust bearing is sleeved on a circular boss on the inner side of the rear cover and is in contact connection with the left end face of the rear cover.
According to the technical scheme, the simulator cylinder body is a cylindrical structural member, the left end and the right end of the simulator cylinder body are both open, a flange plate used for installation is arranged on the outer cylindrical surface of a left end cylinder opening, three bolt holes are uniformly distributed on the flange plate, three-section cylindrical stepped holes are machined along the central axis of the simulator cylinder body, the diameters of the three-section stepped holes decrease gradually from left to right, the diameters of the three-section stepped holes are sequentially a first section of stepped hole, a second section of stepped hole and a third section of stepped hole, a second piston and a second piston spring are installed in the first section of stepped hole, the first piston and the first piston spring are installed in the second section of stepped hole, the third section of stepped hole is an oil inlet and outlet hole of the simulator cylinder body, an internal threaded hole is machined in the cylinder wall of the first section of stepped hole, the three-section cylindrical stepped holes are communicated with each other, and rotation axes are collinear.
According to the technical scheme, a first piston and a second piston are sequentially arranged in a first section of stepped hole and a second section of stepped hole of a simulator cylinder body in a sliding mode, a third piston is sleeved in the first piston in a sliding mode, a second piston sealing ring and a third piston sealing ring are respectively sleeved in annular grooves of the second piston and the third piston, the first piston is sleeved on an annular boss on the left side second end face of the first piston, the left end face of the first piston is in contact connection with the bottom face of the annular boss on the right end face of the second piston, the right end face of the first piston is in contact connection with the bottom face of the annular boss on the left end face of the first piston, the second piston spring and the third piston are respectively arranged on left end shafts of the second piston and the third piston, the left end face of the second piston is in contact connection with the right end face of a baffle plate, the right end face of the second piston spring is in contact connection with the left end face of the second piston large-diameter shaft, the third piston seat is in transition fit with the left end face of the third piston, the left end face of the third piston is in contact connection with the right end face of the third piston, the left end face of the third piston is in contact with the third spring seat is in contact with the right end face of the third piston, and the third end face of the third piston is in contact connection with the third spring seat is in contact with the left end face of the third spring seat is in contact with the third end face of the third piston.
The third piston is a two-section stepped shaft, the diameter of the right end shaft is larger, an annular groove for placing a sealing ring is formed in the cylindrical surface of the right end shaft, the diameter of the left end shaft is smaller and is used for installing a third piston spring, a circular groove for placing a retainer ring of the third piston spring seat is formed in the cylindrical surface of the left end shaft, a circular hole is formed in the left end shaft along the rotation center line of the stepped shaft, and the diameter of the hole is slightly larger than that of a slide rod of the screw rod ejector rod; the first piston is a two-section stepped shaft, the right end shaft diameter is larger, the left end shaft diameter is smaller, the left end shaft diameter is used for installing a third piston spring, a circular boss is arranged on the left end face of the shaft with larger diameter and used for installing the first piston spring, a circular stepped hole is machined along the rotation center line of the stepped shaft, the diameter of the right end of the stepped hole is larger and is equal to that of the right end of the third piston, and the diameter of the left end of the stepped hole is smaller and is equal to that of the left end of the third piston; the second piston is a two-section stepped shaft, the diameter of the right end shaft is larger, a circular boss is arranged on the right end face and used for installing the first piston spring, an annular groove used for placing a sealing ring is processed on the cylindrical surface of the right end shaft, the diameter of the left end shaft is smaller and used for installing the second piston spring, a circular through hole is processed along the rotation center line of the stepped shaft, and the diameter of the through hole is slightly larger than that of the left end shaft of the first piston.
According to the technical scheme, the rotation axes of the first piston, the second piston, the third piston spring seat, the screw rod ejector rod, the toothed internal circulation nut, the first thrust bearing, the second thrust bearing and the simulator cylinder are collinear, the rotation axis of the motor output shaft is collinear with the rotation axis of the driving gear, and the rotation axis of the motor output shaft is parallel to the rotation axes of the first piston, the second piston, the third piston spring seat, the screw rod ejector rod, the toothed internal circulation nut, the first thrust bearing, the second thrust bearing and the simulator cylinder.
The control method of the active brake pedal stroke simulator comprises the following steps:
1. the working state instructions input by the brake system controller are detected, and the active brake pedal stroke simulator has 5 working states:
1) Idle state
When the active brake pedal stroke simulator is in an idle state, namely, the brake is not applied, the simulator driving mechanism and the simulator actuating mechanism do not work, the screw rod ejector rod is in an initial position and presses down the limit switch, the first piston, the second piston, the third piston, the first piston spring, the second piston spring and the third piston spring are all in the initial state, the motor is not moved, and brake fluid is stored in a closed cavity wrapped by the first piston, the third piston and the simulator cylinder;
2) Pedal travel simulation state
When the active brake pedal stroke simulator is in a pedal stroke simulation state, the simulator driving mechanism does not work, the simulator executing mechanism works, the screw rod ejector rod is in an initial position and presses down the limit switch, the screw rod ejector rod cannot interfere with the third piston, and the motor is not moved; when the pressure of the brake pipeline is increased, brake fluid flows in from the oil inlet and outlet hole, the pressure acts on the first piston through the third piston, and when the force acting on the first piston is equal to the pretightening force of the first elastic piston spring, the first piston spring starts to compress, and the simulation process of the first pedal feel is performed; when the force acting on the first piston is equal to the pre-tightening force of the second piston spring, the second piston spring begins to compress, which is a second-stage pedal feel simulation process; the two pedal simulation processes are combined together, so that the pedal feeling close to a real brake pedal can be simulated; when the second piston spring and the first piston spring are compressed, air in the simulator cylinder body is discharged through the vent hole, so that the second piston and the first piston can move freely; when the pressure of the pipeline is withdrawn, the second piston spring and the first piston spring return, and the brake fluid flows back to the pipeline from the oil inlet and outlet holes;
3) Pressurized state
When the active brake pedal stroke simulator is in a pressurizing state, the simulator driving mechanism and the simulator executing mechanism work, the motor controller sends a control instruction to enable the motor to rotate positively, the motor drives the toothed internal circulation nut to rotate through the driving gear, the axial displacement of the toothed internal circulation nut is limited by the first thrust bearing and the second thrust bearing, the toothed internal circulation nut converts the rotary motion into linear motion of the screw rod ejector rod through the inner rollaway nest and the ball, when the screw rod ejector rod moves to be in contact with the third piston, the third piston starts to move rightwards relative to the first piston, the pressurizing process starts, the third piston is continuously pushed along with the screw rod ejector rod, and the pressurizing process is continuously carried out;
4) Pressure maintaining state
When the active brake pedal stroke simulator is in a pressure maintaining state, the motor controller sends a control command to enable the motor to be static, and the screw mandrel and the third piston keep the original positions unchanged, so that the brake fluid pressure in the active brake pedal stroke simulator is kept unchanged;
5) Reduced pressure state
When the active brake pedal stroke simulator is in a decompression state, the simulator driving mechanism and the simulator executing mechanism work, the motor controller sends a control instruction to enable the motor to reversely rotate, the motor drives the toothed internal circulation nut to rotate through the driving gear, the axial displacement of the toothed internal circulation nut is limited by the first thrust bearing and the second thrust bearing, the toothed internal circulation nut converts the rotary motion into linear motion of the screw rod ejector rod through the inner rollaway nest and the ball until the screw rod ejector rod moves to be in contact with the limit switch, the third piston moves leftwards relative to the first piston under the action of the third piston spring and high-pressure brake fluid until the third piston returns, and the decompression process is finished.
2. Judging whether the screw mandrel is at an initial position or not by detecting the state of the limit switch;
3. according to the working state instruction and the position of the screw mandrel, how to drive the motor:
1) If the working state instruction detected by the active brake pedal stroke simulator is in an idle state, the motor is not moved when the screw rod ejector rod is in the initial position; when the screw rod ejector rod is not at the initial position, the motor is driven to reversely rotate, so that the screw rod ejector rod moves to the initial position;
2) If the active brake pedal stroke simulator is in a pedal stroke simulation state, the motor is not moved when the screw rod ejector rod is in the initial position; when the screw rod ejector rod is not at the initial position, the motor is driven to reversely rotate, so that the screw rod ejector rod moves to the initial position;
3) If the active brake pedal stroke simulator is in a supercharging state, the driving motor rotates positively, so that the screw rod ejector rod moves in the direction of pushing the third piston;
4) If the active brake pedal stroke simulator is in a pressure maintaining state, the motor is stationary;
5) If the active brake pedal stroke simulator is in a decompression state, driving the motor to reversely rotate so as to enable the screw rod ejector rod to operate to an initial position;
4. Returning to the step 1.
Compared with the prior art, the invention has the beneficial effects that:
1. the active brake pedal stroke simulator has high integration level, relatively complete self functions and simple interface, and can be conveniently integrated in the existing hydraulic brake system. The automobile manufacturer can connect the brake pipe into the traditional hydraulic brake system by only changing the brake pipe and adding a small amount of electromagnetic valves.
2. The active brake pedal stroke simulator integrates pedal feel simulation function and pressure regulation function integrating active pressurization, pressure maintaining and active depressurization, and overcomes the defect of the pressure regulation capability of the traditional hydraulic regulation unit. The two functions can be added on the basis of the traditional hydraulic braking system by automobile manufacturers, and the flexibility and accuracy of adjustment of the hydraulic braking system are improved.
3. The active brake pedal travel simulator provided by the invention adopts two elastic elements with different rigidities to simulate pedal feel, so that the simulated pedal force curve is more similar to the traditional pedal force curve, and the pedal feel can be more similar to the traditional hydraulic brake system.
4. The active brake pedal stroke simulator can be arranged in a brake system of a hybrid electric vehicle and an electric vehicle, can enable hydraulic braking to be matched with motor braking better through accurate brake pressure adjustment, plays the regenerative braking capacity of the motor to the greatest extent, and greatly improves the economy of the hybrid electric vehicle and the electric vehicle.
5. The active brake pedal travel simulator can be installed in an on-line control braking system, can simulate pedal feel in the braking process of a conventional braking system, and can be used as a backup braking system to realize pressure boosting, pressure maintaining, pressure reducing and other pressure regulation after the conventional braking system fails, so that the emergency braking requirement under an emergency condition is met, and the driving safety is guaranteed to the greatest extent.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a front view of an active brake pedal travel simulator according to the present invention;
FIG. 2 is a right side view of an active brake pedal travel simulator according to the present invention;
FIG. 3 is a flow chart of a method of controlling an active brake pedal travel simulator in accordance with the present invention;
in the figure: 1. a novel electric motor drive system includes a toothed internal circulation nut, 2, a second thrust bearing, 3, a first thrust bearing, 4, a limit switch, 5, a lead screw carrier, 6, a ball, 7, a drive gear, 8, a limit switch signal wire, 9, a first motor mounting bolt, 10, a motor, 11, a motor controller, 12, a second piston seal, 13, a simulator cylinder, 14, a third piston seal, 15, an oil inlet and outlet hole, 16, a first piston, 17, a third piston, 18, a first piston spring, 19, a third piston spring, 20, a third piston spring seat, 21, a third piston spring retainer, 22, a second piston, 23, a second piston spring, 24, a vent hole, 25, a second bulkhead connecting bolt, 26, a bulkhead, 27, a fourth rear cover connecting rivet, 28, 29, a second motor mounting bolt, 30, a seventh rear cover connecting rivet, 31, a third bulkhead connecting bolt, 32, a sixth rear cover connecting rivet, 33, a fifth rear cover connecting rivet, 34, a third rear cover connecting rivet, 35, a second rear cover connecting rivet, 36, a first bulkhead connecting rivet, 37.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
the active brake pedal travel simulator comprises a simulator driving mechanism and a simulator executing mechanism.
Referring to fig. 1 and 2, the simulator driving mechanism includes a toothed internal circulation nut 1, a second thrust bearing 2, a first thrust bearing 3, a limit switch 4, a screw rod push rod 5, a ball 6, a driving gear 7, a limit switch signal line 8, a first motor fixing bolt 9, a motor 10, a motor controller 11, a partition 26, a fourth back cover connecting rivet 27, a back cover 28, a second motor fixing bolt 29, a seventh back cover connecting rivet 30, a sixth back cover connecting rivet 32, a fifth back cover connecting rivet 33, a third back cover connecting rivet 34, a second back cover connecting rivet 35, and a first back cover connecting rivet 37; the simulator actuating mechanism comprises a second piston sealing ring 12, a simulator cylinder 13, a third piston sealing ring 14, an oil inlet and outlet hole 15, a first piston 16, a third piston 17, a first piston spring 18, a third piston spring 19, a third piston spring seat 20, a third piston spring seat retainer ring 21, a second piston 22, a second piston spring 23, an air vent 24, a second partition connecting bolt 25, a third partition connecting bolt 31 and a first partition connecting bolt 36.
The toothed internal circulation nut 1 is a disc structural member, the right end of the toothed internal circulation nut 1 is provided with a cylindrical boss, the center of the boss coincides with the center of the toothed internal circulation nut 1, teeth meshed with the driving gear 7 are arranged on the outer cylindrical surface on the periphery of the toothed internal circulation nut 1, a central through hole is formed in the center of the toothed internal circulation nut 1, and a spiral rollaway nest for installing the balls 6 is arranged on the inner cylindrical surface of the central through hole.
The screw mandrel 5 consists of a left section and a right section, the left section is a screw mandrel which is matched with a central through hole of the toothed internal circulation nut 1 and the ball 6 and is provided with a spiral rollaway nest, the right section is a cylindrical slide bar with a smooth surface, and the screw mandrel 5 plays a role in converting the rotary motion of the toothed internal circulation nut 1 into linear motion.
The first thrust bearing 3 and the second thrust bearing 2 can adopt thrust ball bearings or thrust cylindrical roller bearings, and the first thrust bearing 3 and the second thrust bearing 2 can bear the radial acting force of the toothed internal circulation nut 1 and can limit the axial displacement of the toothed internal circulation nut 1.
The simulator cylinder 13 is a cylindrical structural member, the left end and the right end of the simulator cylinder are both open, a flange plate for installation is arranged on the outer cylindrical surface of the left end cylinder opening, three bolt holes are uniformly distributed on the flange plate, three-section cylindrical stepped holes are processed along the central axis of the simulator cylinder 13, the diameters of the three-section stepped holes decrease from left to right in sequence, the three-section cylindrical stepped holes are a first section stepped hole, a second section stepped hole and a third section stepped hole in sequence, wherein the second piston 22 and the second piston spring 23 are installed in the first section stepped hole, the first piston 16 and the first piston spring 18 are installed in the second section stepped hole, the third section stepped hole is an oil inlet and outlet hole 15 of the simulator cylinder 13, and are processed into an internal threaded hole, the cylindrical walls of the first section stepped holes are further processed with vent holes 24, and the three-section cylindrical stepped holes are communicated with each other and the rotation axes are collinear.
The baffle 26 be disc type structure, the outline of baffle 26 outer disc comprises two eccentric circles and two circumscribes of two eccentric circles, the diameter of the last eccentric circle on the baffle 26 is great, the diameter of the lower eccentric circle on the baffle 26 is less, the baffle 26 is processed in two eccentric circle centers and is had two central through-holes, still processing has three equipartition bolt hole on the plane of baffle 26, two equipartition bolt holes, seven rivet holes, three equipartition screw hole distribution circle is arranged with the last eccentric circle on the baffle 26 concentric with, two equipartition screw hole distribution circle is arranged with the lower eccentric circle on the baffle 26 concentric with, seven equipartition screw hole distribution circles are arranged with the last eccentric circle on the baffle 26 concentric with, three equipartition screw hole distribution circle diameter is less, seven rivet hole distribution circle diameters are great, be provided with the ring boss of installation second thrust bearing 2 on the left end face of baffle 26.
The rear cover 28 is a stepped cylindrical structural member, the left end of the rear cover is closed, the right end of the rear cover is open, a central through hole for installing the limit switch 4 is processed at the left end, the outer contour of the outer circular surface of the right end cylinder opening is the same as that of the outer circular surface of the partition plate 26, a flange plate for installation is arranged on the outer circular surface of the right end cylinder opening, and seven rivet holes are formed in the flange plate and are matched with the seven rivet holes in the partition plate 26; the rear cover 28 is provided with two stepped holes, the left end stepped hole is a central round hole and has smaller diameter, the inner profile of the right end stepped hole is identical to the outer profile of the outer circular surface of the partition plate 26 in shape, the two stepped holes are mutually communicated, the rotating shaft of the left end stepped hole is collinear with the upper eccentric circular rotating shaft of the right end stepped hole, and the left end face of the right end stepped hole is provided with a circular boss for installing the first thrust bearing 3.
The third piston 17 is a two-section stepped shaft, the diameter of the right end shaft is larger, an annular groove for placing the third piston sealing ring 14 is processed on the cylindrical surface of the right end shaft, the diameter of the left end shaft is smaller and is used for mounting the third piston spring 19, a circular groove for placing the third piston spring seat retainer ring 21 is processed on the cylindrical surface of the left end shaft, a circular hole is processed on the left end shaft along the rotation center line of the stepped shaft, and the diameter of the hole is slightly larger than the diameter of the slide rod of the screw mandrel 5.
The first piston 16 is a two-section stepped shaft, the right end shaft diameter is larger, the left end shaft diameter is smaller, the left end shaft diameter is used for installing a third piston spring 19, a circular boss is arranged on the left end face of the larger diameter shaft and is used for installing the first piston spring 18, a circular stepped hole is machined along the rotation center line of the stepped shaft, the right end diameter of the stepped hole is larger and equal to the right end shaft diameter of the third piston 17, the left end diameter of the stepped hole is smaller and equal to the left end shaft diameter of the third piston 17.
The second piston 22 is a two-section stepped shaft, the diameter of the right end shaft is larger, a circular boss is arranged on the right end face and is used for installing the first piston spring 18, an annular groove used for placing the second piston sealing ring 12 is processed on the cylindrical surface of the right end shaft, the diameter of the left end shaft is smaller and is used for installing the second piston spring 23, a circular through hole is processed along the rotation center line of the stepped shaft, and the diameter of the through hole is slightly larger than that of the left end shaft of the first piston 16.
The first piston spring 18 adopts a cylindrical spiral spring, has smaller rigidity, and mainly simulates the pressure volume characteristic of a wheel cylinder during small-intensity braking in a pedal stroke simulation state; the second piston spring 23 adopts a cylindrical spiral spring, the rigidity is larger, the pressure volume characteristic of the wheel cylinder is mainly simulated in a pedal stroke simulation state when the brake is braked at high strength, the third piston spring 19 adopts a cylindrical spiral spring, the rigidity is larger, and the third piston 17 is mainly moved towards the direction of the screw mandrel 5 (namely leftwards relative to the second piston 22) in a decompression state, so that the active decompression function is realized.
The third piston spring seat 20 is a circular structural member and is used for installing and fixing the third piston spring 19.
The third piston spring seat retainer ring 21 is a circular structural member and is made of aluminum alloy materials, and a notch is formed in the circular ring for convenient installation. The third piston spring seat retainer 21 functions to restrict the axial displacement of the third piston spring seat 20.
The second piston sealing ring 12 and the third piston sealing ring 14 are O-shaped sealing rings and are used for sealing brake fluid.
The first rear cover connecting rivet 37, the second rear cover connecting rivet 35, the third rear cover connecting rivet 34, the fourth rear cover connecting rivet 27, the fifth rear cover connecting rivet 33, the sixth rear cover connecting rivet 32, and the seventh rear cover connecting rivet 30 are half-round head rivets for connecting the rear cover 28 and the partition 26.
The first baffle connecting bolt 36, the second baffle connecting bolt 25 and the third baffle connecting bolt 31 adopt common thin-tooth hexagon bolts for connecting the simulator cylinder 13 and the baffle 26; the first motor fixing bolt 9 and the second motor fixing bolt 29 adopt common fine tooth hexagon bolts for connecting the motor 10 and the partition plate 26.
The motor 10 adopts a brush direct current permanent magnet motor, and the motor 10 is a power source of a simulator driving mechanism.
The positions and the connection modes of the specific components are as follows:
the first piston 16 and the second piston 22 are sequentially arranged in the first section stepped hole and the second section stepped hole of the simulator cylinder 13 in a sliding connection mode, the second piston sealing ring 12 is sleeved in an annular groove of the second piston 22, the third piston 17 is sleeved in the first piston 16 in a sliding connection mode, and the third piston sealing ring 14 is sleeved in an annular groove of the third piston 17. The first piston spring 18 is sleeved on a circular boss on the second end face on the left side of the first piston 16, the left end face of the first piston spring 18 is in contact connection with the bottom face of the circular boss on the right end face of the second piston 22, and the right end face of the first piston spring 18 is in contact connection with the bottom face of the circular boss on the left end face of the first piston 16; the second piston spring 23 and the third piston spring 19 are respectively arranged on the left end shafts of the second piston 22 and the third piston 17, the left end surface of the second piston spring 23 is in contact connection with the right end surface of the partition plate 26, the right end surface of the second piston spring 23 is in contact connection with the left end surface of the large-diameter shaft of the second piston 22, the third piston spring seat 20 is sleeved at the left end of the third piston 17 in transition fit, the left end surface of the third piston spring 19 is in contact connection with the right end surface of the third piston spring seat 20, and the right end surface of the third piston spring 19 is in contact connection with the left end surface of the small-diameter shaft of the first piston 16; the preload of the second piston spring 23 is greater than the preload of the first piston spring 18. The third piston spring seat retainer ring 21 is installed in a circular groove at the left end of the third piston 17, and the left end face of the third piston spring seat 20 is in contact connection with the right end face of the third piston spring seat retainer ring 21. The motor 10 is mounted on the right end face of the diaphragm 26 below the simulator cylinder 13 by the first motor fixing bolt 9 and the second motor fixing bolt 29. The motor controller 11 is mounted on the right end face of the housing of the motor 10, and the wiring terminal of the motor 10 is connected to the drive output terminal of the motor controller 11, and the motor controller 11 is connected to the brake system controller to receive the instruction issued by the brake system controller. The limit switch 4 is installed in the central position of the rear cover 28, the limit switch 4 transmits the collected signals to the motor controller 11 through the limit switch signal line 8, the limit switch 4 is a small-stroke micro-switch, and when the screw mandrel 5 returns to the initial position, the screw mandrel 5 is contacted with the limit switch 4 to generate corresponding signals. The driving gear 7 is sleeved on the output shaft of the motor 10 in interference fit connection, and the driving gear 7 is in meshed connection with the toothed internal circulation nut 1 in the way of teeth on the outer circumferential surface. The toothed internal circulation nut 1 is sleeved on the screw rod at the left end of the screw rod ejector rod 5, the ball 6 is arranged in a spiral rollaway nest on a central through hole of the toothed internal circulation nut 1 and a spiral rollaway nest on the screw rod in the screw rod ejector rod 5, the ball 6 can circulate through a circulation rollaway nest (not shown in the figure) in the toothed internal circulation nut 1, and the rotary motion of the toothed internal circulation nut 1 is converted into linear motion of the screw rod ejector rod 5 through the ball 6. The toothed internal circulation nut 1 is arranged between the rear cover 28 and the partition plate 26 through the first thrust bearing 3 and the second thrust bearing 2, the second thrust bearing 2 is sleeved on a boss at the right end of the toothed internal circulation nut 1 and is in contact connection, the right end face of the toothed internal circulation nut 1 is in contact connection with the left end face of the second thrust bearing 2, the second thrust bearing 2 is sleeved on a circular boss on the left end face of the partition plate 26 and is in contact connection, the right end face of the second thrust bearing 2 is in contact connection with the left end face of the partition plate 26, the left end face of the toothed internal circulation nut 1 is in contact connection with the right end face of the first thrust bearing 3, the first thrust bearing 3 is sleeved on a circular boss on the inner side of the rear cover 28 and is in contact connection with the left end face of the rear cover 28. The slide bar part at the right end of the screw mandrel 5 passes through the upper eccentric circular hole on the partition plate 26 and the circular hole on the third piston 17, and a certain gap is reserved between the upper eccentric circular hole and the circular hole. The spindle carrier 5 can contact the third piston 17 but not the diaphragm 26 during pressurization. When the screw rod 5 returns to the initial position, no interference with the movement of the third piston 17 occurs. The simulator cylinder 13 is mounted on the right end face of the partition plate 26 by three bolts, which are a first partition plate connecting bolt 36, a second partition plate connecting bolt 25 and a third partition plate connecting bolt 31, respectively, and the left end face of the simulator cylinder 13 is in contact connection with the right end face of the partition plate 26. The rear cover 28 is mounted on the left end face of the partition 26 by seven rivets, the right end face of the rear cover 28 is in contact connection with the left end face of the partition 26, and the seven rivets are a first rear cover connecting rivet 37, a second rear cover connecting rivet 35, a third rear cover connecting rivet 34, a fourth rear cover connecting rivet 27, a fifth rear cover connecting rivet 33, a sixth rear cover connecting rivet 32 and a seventh rear cover connecting rivet 30, respectively. Wherein: the rotation axes of the first piston 16, the second piston 22, the third piston 17, the third piston spring seat 20, the screw mandrel 5, the toothed internal circulation nut 1, the first thrust bearing 3, the second thrust bearing 2 and the simulator cylinder 13 are collinear, the rotation axis of the output shaft of the motor 10 is collinear with the rotation axis of the driving gear 7, and the rotation axis of the output shaft of the motor 10 is parallel with the rotation axes of the first piston 16, the second piston 22, the third piston 17, the third piston spring seat 20, the screw mandrel 5, the toothed internal circulation nut 1, the first thrust bearing 3, the second thrust bearing 2 and the simulator cylinder 13.
Referring to fig. 3, the active brake pedal travel simulator of the present invention, as a component of a brake system, needs to operate according to an instruction of a brake system controller, and the switching of different operating states is controlled by the brake system. Since the invention does not involve other components of the brake system, a complete braking process cannot be described, and only the control method of the active brake pedal travel simulator will be described. The active brake pedal travel simulator is controlled by adopting a closed-loop control method, and comprises the following specific steps:
1. the working state instructions input by the brake system controller are detected, and the active brake pedal stroke simulator has 5 working states:
1) Idle state
When the active brake pedal stroke simulator is in an idle state, namely, is not braked, the simulator driving mechanism and the simulator actuating mechanism do not work, the screw mandrel 5 is in an initial position and presses down the limit switch 4, the first piston 16, the second piston 22, the third piston 17, the first piston spring 18, the second piston spring 23 and the third piston spring 19 are all in an initial state, the motor 10 is not moved, and brake fluid is stored in a closed cavity wrapped by the first piston 16, the third piston 17 and the simulator cylinder 13;
2) Pedal travel simulation state
When the active brake pedal stroke simulator is in a pedal stroke simulation state, the simulator driving mechanism does not work, the simulator executing mechanism works, the screw rod ejector rod 5 is in an initial position and presses down the limit switch 4, the screw rod ejector rod 5 cannot interfere with the third piston 17, and the motor 10 does not move; when the brake line pressure increases, brake fluid flows in from the oil inlet and outlet hole 15, the pressure acts on the first piston 16 through the third piston 17, and when the force acting on the first piston 16 is equal to the pretightening force of the first piston spring 18, the first piston spring 18 starts to compress, which is a simulation process of the first-stage pedal feel; when the force acting on the first piston 16 is equal to the pretension of the second piston spring 23, the second piston spring 23 starts to compress, which is a second-stage pedal feel simulation process; the two pedal simulation processes are combined together, so that the pedal feeling close to a real brake pedal can be simulated; when the second piston spring 23 is compressed with the first piston spring 18, air in the simulator cylinder 13 is discharged through the vent hole 24 so that the second piston 22 and the first piston 16 can freely move; when the pipeline pressure is withdrawn, the second piston spring 23 and the first piston spring 18 return, and the brake fluid flows back to the pipeline from the oil inlet and outlet hole 15;
3) Pressurized state
When the active brake pedal stroke simulator is in a pressurized state, the simulator driving mechanism and the simulator executing mechanism work, the motor controller 11 sends a control command to enable the motor 10 to rotate positively, the motor 10 drives the toothed internal circulation nut 1 to rotate through the driving gear 7, the axial displacement of the toothed internal circulation nut 1 is limited by the first thrust bearing 3 and the second thrust bearing 2, the toothed internal circulation nut 1 converts the rotary motion into the linear motion of the screw rod ejector rod 5 through the inner raceway and the ball 6, when the screw rod ejector rod 5 moves to be in contact with the third piston 17, the third piston 17 starts to move rightwards relative to the first piston 16, the pressurizing process starts, and the third piston 17 is continuously pushed along with the continuous pushing of the screw rod ejector rod 5, and the pressurizing process is continuously carried out;
4) Pressure maintaining state
When the active brake pedal stroke simulator is in a pressure maintaining state, the motor controller 11 sends a control command to enable the motor 10 to be static, and the screw mandrel 5 and the third piston 17 keep the original position and are not moved, so that the brake fluid pressure in the active brake pedal stroke simulator is kept unchanged;
5) Reduced pressure state
When the active brake pedal stroke simulator is in a decompression state, the simulator driving mechanism and the simulator executing mechanism work, the motor controller 11 sends a control command to enable the motor 10 to reversely rotate, the motor 10 drives the toothed inner circulation nut 1 to rotate through the driving gear 7, the axial displacement of the toothed inner circulation nut 1 is limited by the first thrust bearing 3 and the second thrust bearing 2, the toothed inner circulation nut 1 converts the rotary motion into the linear motion of the screw rod ejector 5 through the inner roller path and the ball 6 until the screw rod ejector 5 moves to be in contact with the limit switch 4, the third piston 17 moves leftwards relative to the first piston 16 under the action of the third piston spring 19 and high-pressure brake fluid until the third piston 17 returns, the decompression process is finished, and in the working state, the active brake pedal stroke simulator can assist the brake system to decompress, and after each braking is finished, the screw rod ejector 5 moves leftwards, so that the screw rod ejector 5 returns to an initial position;
2. Judging whether the screw mandrel 5 is at an initial position or not by detecting the state of the limit switch 4;
3. how to drive the motor 10 is determined according to the working state instruction and the position of the screw mandrel 5:
1) If the working state instruction detected by the active brake pedal stroke simulator is in an idle state, when the screw mandrel 5 is in the initial position, the motor 10 is not moved; when the screw mandrel 5 is not at the initial position, the driving motor 10 reversely rotates to enable the screw mandrel 5 to run to the initial position;
2) If the active brake pedal stroke simulator is in a pedal stroke simulation state, when the screw mandrel 5 is in the initial position, the motor 10 is not moved; when the screw mandrel 5 is not at the initial position, the driving motor 10 reversely rotates to enable the screw mandrel 5 to run to the initial position;
3) If the active brake pedal stroke simulator is in a supercharging state, the driving motor 10 is driven to rotate in the forward direction, so that the screw mandrel 5 moves in the direction of pushing the third piston 17;
4) If the active brake pedal travel simulator is in a dwell state, the motor 10 is stationary;
5) If the active brake pedal stroke simulator is in a decompression state, the motor 10 is driven to reversely rotate, so that the screw mandrel 5 is operated to an initial position;
4. Returning to the step 1.
Claims (6)
1. The active brake pedal travel simulator is characterized by comprising a simulator driving mechanism and a simulator executing mechanism;
the simulator driving mechanism comprises a motor controller (11), a motor (10), a driving gear (7), a toothed internal circulation nut (1), balls (6), a screw mandrel (5), a limit switch (4), a rear cover (28), a baffle plate (26), a first thrust bearing (3) and a second thrust bearing (2);
the simulator actuating mechanism comprises a second piston (22), a second piston spring (23), a second piston sealing ring (12), a first piston (16), a first piston spring (18), a third piston (17), a third piston spring (19), a third piston spring seat (20), a third piston spring seat retainer ring (21), a third piston sealing ring (14) and a simulator cylinder body (13);
the simulator cylinder body (13) is arranged on the right end face of the partition plate (26) through bolts, the rear cover (28) is arranged on the left end face of the partition plate (26) through rivets, the toothed inner circulation nut (1) is arranged between the rear cover (28) and the partition plate (26) through the first thrust bearing (3) and the second thrust bearing (2), the left end of the screw mandrel (5) is arranged in a central hole of the toothed inner circulation nut (1) and is in rolling connection, the right end of the screw mandrel (5) is inserted into a stepped hole of the simulator cylinder body (13), the right end of the screw mandrel (5) is sleeved with a third piston (17), the left end of the third piston (17) is sleeved on a second piston (22), the right end of the third piston (17) is sleeved on a first piston (16), a third piston spring (19) and a third piston spring seat (20) are sequentially sleeved on the third piston (17), the third piston spring seat (21) is arranged in a circular groove at the left end of the third piston (17), the second piston (22) is sleeved with the stepped hole (13) in the second piston cylinder body (13), the right end of the second piston (22) is sleeved with the third piston (16) is sleeved with the third piston spring seat (16), the motor (10) is arranged on the right end face of a partition plate (26) below the simulator cylinder body (13), the driving gear (7) is sleeved on an output shaft of the motor (10) for interference fit connection, the driving gear (7) is in meshed connection with the toothed internal circulation nut (1), the motor controller (11) is arranged on the right end face of a shell of the motor (10), the motor (10) is connected with the motor controller (11) through a wire, the limit switch (4) is arranged at the central position of the rear cover (28), and the limit switch (4) is connected with the motor controller (11) through a limit switch signal wire (8);
The baffle (26) is a disc-type structural member, the outline of the outer circular surface of the baffle (26) consists of two eccentric circles and two circumscribed lines of the two eccentric circles, the diameter of an upper eccentric circle on the baffle (26) is larger than that of a lower eccentric circle, two central through holes are processed in the center of the two eccentric circles on the baffle (26), three uniformly distributed bolt holes, two uniformly distributed bolt holes and seven rivet holes are processed on the plane of the baffle (26), the three uniformly distributed bolt hole distribution circles are concentrically arranged with the upper eccentric circle on the baffle (26), the two uniformly distributed bolt hole distribution circles are concentrically arranged with the lower eccentric circle on the baffle (26), the seven rivet hole distribution circles are concentrically arranged with the upper eccentric circle on the baffle (26), the diameter of the three uniformly distributed bolt hole distribution circles is smaller than that of the seven rivet hole distribution circles, and a circular boss for mounting the second thrust bearing (2) is arranged on the left end face of the baffle (26); the rear cover (28) is a stepped cylindrical structural member, the left end of the rear cover is closed, the right end of the rear cover is open, a central through hole for installing the limit switch (4) is processed at the left end of the rear cover, the outer contour of the outer circular surface of the right end cylinder opening is identical to the outer contour of the outer circular surface of the partition plate (26), a flange plate for installation is arranged on the outer circular surface of the right end cylinder opening, seven rivet holes are formed in the flange plate and are matched with the seven rivet holes in the partition plate (26); two stepped holes are formed in the rear cover (28), the left end stepped hole is a central round hole, the inner profile of the right end stepped hole is identical to the outer profile of the outer circular surface of the partition plate (26), the two stepped holes are mutually communicated, the rotating shaft of the left end stepped hole is collinear with the upper eccentric circular rotating shaft of the right end stepped hole, and the left end face of the right end stepped hole is provided with a circular boss for installing the first thrust bearing (3);
The third piston (17) is a two-section stepped shaft, the right end shaft diameter of the third piston is larger than the left end shaft diameter, an annular groove for placing a third piston sealing ring (14) is formed in the cylindrical surface of the right end shaft, a third piston spring (19) is arranged on the left end shaft, a circular groove for placing a third piston spring seat retainer ring (21) is formed in the cylindrical surface of the left end shaft, a circular hole is formed in the left end shaft along the rotation center line of the stepped shaft, and the diameter of the circular hole is larger than the diameter of a slide rod of the screw rod ejector rod (5);
the first piston (16) is a two-section stepped shaft, the right end shaft diameter of the first piston is larger than the left end shaft diameter, the left end shaft diameter is used for installing a third piston spring (19), a circular boss is arranged on the left end surface of the shaft with larger diameter and used for installing a first piston spring (18), a circular stepped hole is machined along the rotation center line of the stepped shaft, the right end diameter of the stepped hole is larger than the left end diameter of the stepped hole, the right end diameter of the stepped hole is equal to the right end shaft diameter of the third piston (17), and the left end diameter of the stepped hole is equal to the left end shaft diameter of the third piston (17);
the second piston (22) is a two-section stepped shaft, the right end shaft diameter of the second piston is larger than the left end shaft diameter, a circular boss is arranged on the right end surface and used for mounting the first piston spring (18), an annular groove used for placing the second piston sealing ring (12) is formed in the cylindrical surface of the right end shaft, the left end shaft is used for mounting the second piston spring (23), a circular through hole is formed along the rotation center line of the stepped shaft, and the diameter of the through hole is larger than the left end shaft diameter of the first piston (16);
The first piston (16) and the second piston (22) are sequentially arranged in a first section of stepped hole and a second section of stepped hole of the simulator cylinder body (13) in a sliding connection, the third piston (17) is sleeved in the first piston (16) in a sliding connection, the second piston sealing ring (12) is sleeved in an annular groove of the second piston (22), the third piston sealing ring (14) is sleeved in an annular groove of the third piston (17), the first piston spring (18) is sleeved on a circular boss on a second end face on the left side of the first piston (16), the left end face of the first piston spring (18) is in contact connection with the bottom face of the circular boss on the right end face of the second piston (22), the right end face of the first piston spring (18) is in contact connection with the bottom face of the circular boss on the left end face of the first piston (16), the second piston spring (23) is arranged on a left end shaft of the second piston (22), the third piston spring (19) is arranged on a left end shaft of the third piston (17), the left end face of the second piston spring (23) is in contact connection with the left end face of the third piston (22), the left end face of the second piston spring (23) is in contact with the right end face of the third piston (20) is in contact with the right end face of the third piston (22), the left end face of the third piston spring (23) is in contact with the right end of the third piston (20) is in contact with the third end face of the third piston (20), the right end face of the third piston spring (19) is in contact connection with the left end face of the small-diameter shaft of the first piston (16), the third piston spring seat retainer ring (21) is arranged in a circular groove at the left end of the third piston (17), and the left end face of the third piston spring seat (20) is in contact connection with the right end face of the third piston spring seat retainer ring (21).
2. The active brake pedal stroke simulator according to claim 1, wherein the toothed inner circulation nut (1) is a disc-type structural member, a cylindrical boss is arranged at the right end of the toothed inner circulation nut (1), the center of the boss coincides with the center of the toothed inner circulation nut (1), teeth meshed with the driving gear (7) are arranged on the outer cylindrical surface of the toothed inner circulation nut (1), a central through hole is arranged at the center of the toothed inner circulation nut (1), and a spiral rollaway nest for installing the ball (6) is arranged on the inner cylindrical surface of the central through hole; the screw rod ejector rod (5) consists of a left section and a right section, the left section is a screw rod which is matched with a central through hole of the toothed internal circulation nut (1) and the ball (6) and is provided with a spiral rollaway nest, the right section is a cylindrical sliding rod with a smooth surface, and the screw rod ejector rod (5) plays a role in converting the rotary motion of the toothed internal circulation nut (1) into linear motion.
3. The active brake pedal stroke simulator according to claim 1, wherein the right end boss of the toothed internal circulation nut (1) is sleeved with a second thrust bearing (2) for contact connection, the right end face of the toothed internal circulation nut (1) is in contact connection with the left end face of the second thrust bearing (2), the second thrust bearing (2) is sleeved with a circular boss in contact connection with the left end face of the partition plate (26), the right end face of the second thrust bearing (2) is in contact connection with the left end face of the partition plate (26), the left end face of the toothed internal circulation nut (1) is in contact connection with the right end face of the first thrust bearing (3), the first thrust bearing (3) is sleeved with a circular boss in contact connection with the inner side of the rear cover (28), and the left end face of the first thrust bearing (3) is in contact connection with the end face of the rear cover (28).
4. The active brake pedal stroke simulator according to claim 1, wherein the simulator cylinder (13) is a cylindrical structural member, the left end and the right end of the simulator cylinder are both open, a flange plate for installation is arranged on the outer cylindrical surface of the left end cylinder opening, three bolt holes are uniformly distributed on the flange plate, three-section cylindrical stepped holes are processed along the central axis of the simulator cylinder (13), the diameters of the three-section stepped holes decrease from left to right in sequence, the three-section stepped holes are a first section stepped hole, a second section stepped hole and a third section stepped hole in sequence, a second piston (22) and a second piston spring (23) are installed in the first section stepped hole, the first piston (16) and the first piston spring (18) are installed in the second section stepped hole, the third section stepped hole is an oil inlet and outlet hole (15) of the simulator cylinder (13), and is processed into an internal threaded hole, the cylindrical wall of the first section stepped hole is also processed with a vent hole (24), and the three section cylindrical stepped holes are mutually communicated and the rotation axes are collinear.
5. The active brake pedal travel simulator according to claim 1, characterized in that the axes of revolution of the first piston (16), the second piston (22), the third piston (17), the third piston spring seat (20), the screw rod (5), the toothed internal circulation nut (1), the first thrust bearing (3), the second thrust bearing (2), the simulator cylinder (13) are collinear, the axis of revolution of the output shaft of the motor (10) is collinear with the axis of revolution of the drive gear (7), and the axis of revolution of the output shaft of the motor (10) is parallel with the axes of revolution of the first piston (16), the second piston (22), the third piston (17), the third piston spring seat (20), the screw rod (5), the toothed internal circulation nut (1), the first thrust bearing (3), the second thrust bearing (2), and the simulator cylinder (13).
6. The control method of an active brake pedal travel simulator according to claim 1, characterized in that the control method of the active brake pedal travel simulator comprises the steps of:
(1) The working state instructions input by the brake system controller are detected, and the active brake pedal stroke simulator has 5 working states:
1) Idle state
When the active brake pedal stroke simulator is in an idle state, namely, the brake pedal stroke simulator is not braked, the simulator driving mechanism and the simulator actuating mechanism do not work, the screw rod ejector rod (5) is in an initial position and presses down the limit switch (4), the first piston (16), the second piston (22), the third piston (17), the first piston spring (18), the second piston spring (23) and the third piston spring (19) are all in the initial state, the motor (10) is not moved, and brake fluid is stored in a closed cavity wrapped by the first piston (16), the third piston (17) and the simulator cylinder body (13);
2) Pedal travel simulation state
When the active brake pedal stroke simulator is in a pedal stroke simulation state, the simulator driving mechanism does not work, the simulator executing mechanism works, the screw rod ejector rod (5) is in an initial position and presses down the limit switch (4), the screw rod ejector rod (5) cannot interfere with the third piston (17), and the motor (10) is not moved; when the pressure of the brake pipeline is increased, brake fluid flows in from the oil inlet and outlet hole (15), the pressure acts on the first piston (16) through the third piston (17), and when the force acting on the first piston (16) is equal to the pretightening force of the first piston spring (18), the first piston spring (18) starts to compress, and the simulation process of the first-section pedal feel is realized; when the force acting on the first piston (16) is equal to the pre-tightening force of the second piston spring (23), the second piston spring (23) starts to compress, which is a second-stage pedal feel simulation process; when the second piston spring (23) and the first piston spring (18) are compressed, air in the simulator cylinder (13) is discharged through the vent hole (24) so that the second piston (22) and the first piston (16) can move freely; when the pressure of the pipeline is withdrawn, the second piston spring (23) and the first piston spring (18) return, and brake fluid flows back to the pipeline from the oil inlet and outlet hole (15);
3) Pressurized state
When the active brake pedal stroke simulator is in a pressurizing state, the simulator driving mechanism and the simulator executing mechanism work, the motor controller (11) sends a control command to enable the motor (10) to rotate positively, the motor (10) drives the toothed internal circulation nut (1) to rotate through the driving gear (7), the axial displacement of the toothed internal circulation nut (1) is limited by the first thrust bearing (3) and the second thrust bearing (2), the toothed internal circulation nut (1) converts the rotary motion into the linear motion of the screw rod ejector rod (5) through the inner roller path and the ball (6), when the screw rod ejector rod (5) moves to be in contact with the third piston (17), the third piston (17) starts to move rightwards relative to the first piston (16), the pressurizing process starts, the third piston (17) is continuously pushed along with the screw rod ejector rod (5), and the pressurizing process is continuously carried out;
4) Pressure maintaining state
When the active brake pedal stroke simulator is in a pressure maintaining state, the motor controller (11) sends a control instruction to enable the motor (10) to be static, and the screw mandrel (5) and the third piston (17) keep the original positions unchanged, so that the brake fluid pressure in the active brake pedal stroke simulator is kept unchanged;
5) Reduced pressure state
When the active brake pedal stroke simulator is in a decompression state, the simulator driving mechanism and the simulator executing mechanism work, the motor controller (11) sends a control command to enable the motor (10) to reversely rotate, the motor (10) drives the toothed inner circulation nut (1) to rotate through the driving gear (7), the axial displacement of the toothed inner circulation nut (1) is limited by the first thrust bearing (3) and the second thrust bearing (2), the toothed inner circulation nut (1) converts the rotary motion into the linear motion of the screw rod ejector rod (5) through the inner roller way and the ball (6), until the screw rod ejector rod (5) moves to be in contact with the limit switch (4), the third piston (17) moves leftwards relative to the first piston (16) under the action of the third piston spring (19) and high-pressure brake fluid, until the third piston (17) returns, and the decompression process is finished.
(2) Judging whether the screw mandrel (5) is at an initial position or not by detecting the state of the limit switch (4);
(3) According to the working state instruction and the position of the screw mandrel (5), how to drive the motor (10) is determined:
1) If the working state instruction detected by the active brake pedal stroke simulator is in an idle state, when the screw mandrel (5) is in an initial position, the motor (10) is not moved; when the screw rod ejector rod (5) is not at the initial position, the driving motor (10) reversely rotates, so that the screw rod ejector rod (5) moves to the initial position;
2) If the active brake pedal stroke simulator is in a pedal stroke simulation state, when the screw rod ejector rod (5) is in an initial position, the motor (10) is not moved; when the screw rod ejector rod (5) is not at the initial position, the driving motor (10) reversely rotates, so that the screw rod ejector rod (5) moves to the initial position;
3) If the active brake pedal stroke simulator is in a supercharging state, the driving motor (10) rotates positively, so that the screw rod ejector rod (5) moves in the direction of pushing the third piston (17);
4) If the active brake pedal stroke simulator is in a pressure maintaining state, the motor (10) is stationary;
5) If the active brake pedal stroke simulator is in a decompression state, the motor (10) is driven to reversely rotate, so that the screw rod ejector rod (5) is operated to an initial position;
(4) Returning to the step (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457204.XA CN112406829B (en) | 2020-12-10 | 2020-12-10 | Active brake pedal stroke simulator and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457204.XA CN112406829B (en) | 2020-12-10 | 2020-12-10 | Active brake pedal stroke simulator and control method thereof |
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| CN112406829A CN112406829A (en) | 2021-02-26 |
| CN112406829B true CN112406829B (en) | 2024-03-05 |
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| CN103171531A (en) * | 2013-03-19 | 2013-06-26 | 吉林大学 | Active brake pedal travel simulator and control method thereof |
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| CN211252217U (en) * | 2019-12-18 | 2020-08-14 | 吉林大学 | Fully-decoupled braking energy recovery device capable of actively adjusting pedal feel |
| CN213892462U (en) * | 2020-12-10 | 2021-08-06 | 吉林大学 | Active brake pedal stroke simulator |
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- 2020-12-10 CN CN202011457204.XA patent/CN112406829B/en active Active
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| JP2005153713A (en) * | 2003-11-26 | 2005-06-16 | Nissan Motor Co Ltd | Reaction force characteristic control device of brake device |
| CN103171531A (en) * | 2013-03-19 | 2013-06-26 | 吉林大学 | Active brake pedal travel simulator and control method thereof |
| CN207875613U (en) * | 2018-01-18 | 2018-09-18 | 万向钱潮股份有限公司 | A kind of active pedal simulator of brake-by-wire |
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