CN109955840A - Timesharing with failure manpower backup functionality is from primary brake system and braking method - Google Patents
Timesharing with failure manpower backup functionality is from primary brake system and braking method Download PDFInfo
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- CN109955840A CN109955840A CN201910325263.2A CN201910325263A CN109955840A CN 109955840 A CN109955840 A CN 109955840A CN 201910325263 A CN201910325263 A CN 201910325263A CN 109955840 A CN109955840 A CN 109955840A
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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
- 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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
-
- 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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/402—Back-up
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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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/403—Brake circuit failure
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Regulating Braking Force (AREA)
Abstract
The present invention relates to from primary brake system technical field, a kind of timesharing with failure manpower backup functionality is specifically provided from primary brake system and braking method, including power supply (9) and brake monitor (10), it further include the first electric cylinder (8a) and the second electric cylinder (8b) being electrically connected with the brake monitor, and the manual cylinder being connect with the first electric cylinder (8a) with the second electric cylinder (8b)；First electric cylinder (8a) and the second electric cylinder (8b) are respectively connected to two wheel drags on automobile and form two brake circuits, are provided with solenoid valve between each wheel drag and corresponding electric cylinder.Braking method of the invention includes autonomous braking mode, failure manpower backup braking mode and fail-safe braking mode.The configuration of the present invention is simple, at low cost, braking response is fast；High reliablity, fail-safe ability are strong；The control for brake and ABS function of single wheel can be achieved.
Description
Technical field
The present invention relates to from primary brake system, in particular to a kind of timesharing with failure manpower backup functionality is from main brake
System and braking method.
Background technique
Brake system of car is closely related safely with running.The brake fluid system of orthodox car is all led to by driver
It crosses brake pedal and applies brake pressure in the wheel cylinder of each wheel drag, brake to realize and make vehicle deceleration.It is advanced
The personal vehicle systems such as driving assistance system (ADAS) and automated driving system (ADS) require braking system that can implement to vehicle
From main brake, i.e., part or all of wheel is applied in the case where non-brake pedal and braked.Current implementable autonomous system
Dynamic braking system mostly uses greatly electric boosted, and remains the brake control devices such as brake pedal.With unmanned logistics distribution
The development of vehicle, it is no longer necessary to brake control device, having put on agenda from primary brake system suitable for ADS.
In order to improve the reliability and travel safety of braking, brake system of car generally uses mutually independent double loop
Structure, another circuit remains to continue braking action when guaranteeing that a circuit breaks down and fails.Therefore, ADS is aimed to open
Hair be not only considered as from primary brake system continue to use traditional wheel drag as far as possible, it is also contemplated that using double loop redundancy knot
Structure, the reliability to fail in order to further increase also will increase certain labor redundance failure backup.
Double loop at this stage controls a wheel drag using every primary Ioops mostly from primary brake system, when 4 vehicles
There is locking in one of wheel, and locking does not occur in another wheel or is likely to occur brake force deficiency, at this moment dual circuit brake system
System can only be such that the brake pressure of two wheels reduces simultaneously, cause the dangerous of braking.For also being deposited from main brake braking system
In another operating condition, that is, the failure of its electrical braking device.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies of existing technologies, provide that a kind of braking reliability is high, highly-safe has
The timesharing for the manpower backup functionality that fails is from primary brake system and its braking method.
The present invention solve the above problems the technical scheme adopted is that it is a kind of with failure manpower backup functionality timesharing from
Primary brake system, including brake pedal, manual cylinder, power supply and brake monitor further include the first electricity connecting with the power supply
Dynamic cylinder and the second electric cylinder；
First electric cylinder is identical as the second electronic cylinder structure, includes electric cylinder cylinder body, is slideably positioned in the electricity
The dynamic intracorporal piston of cylinder cylinder and the motor for driving the piston to slide, first electric cylinder are also wrapped with the second electric cylinder
Push rod is included, the motor drives the sliding of the piston by the push rod, and through-hole is offered on the piston, and the push rod is living
The oil passage passed through for oil liquid is moved across the through-hole and formed the inner sidewall of the through-hole, is located on the push rod
The two sides of the through-hole, which are respectively formed with, controls the auxiliary section that the through-hole is connected to is closed with merging with the piston；
Oil suction chamber and oil outlet chamber are formed between the piston and the electric cylinder cylinder body, the manual cylinder passes through system respectively
Dynamic pipeline is connected to the oil suction chamber of first electric cylinder and the second electric cylinder, in the oil outlet chamber and automobile of first electric cylinder
The first wheel drag and the second wheel drag be connected to form the first brake circuit, and first electric cylinder go out
The first solenoid valve is respectively arranged on brake piping between oil pocket and first wheel drag and the second wheel drag
With second solenoid valve, the third wheel drag and the 4th wheel braking in oil outlet chamber and automobile in second electric cylinder
Device is connected to form the second brake circuit, and the third wheel drag in the oil outlet chamber and automobile in second electric cylinder with
And third solenoid valve and the 4th solenoid valve are respectively arranged on the brake piping between four-wheel brakes, the manual cylinder with
It is additionally provided on the brake piping between the oil suction chamber for detecting pressure sensor hydraulic in the brake piping,
The pressure sensor is electrically connected with the brake monitor.
In some embodiments, the through-hole include cylindrical surface and along the cylindrical surface both ends to the two of the piston
The first circular conical surface and the second circular conical surface of side flaring, the auxiliary section positioned at the through-hole two sides include and first circular cone
The compatible third circular conical surface in face and the 4th circular conical surface compatible with second circular conical surface, first circular conical surface and
Three circular conical surfaces match to form transfer valve, and second circular conical surface matches to form delivery valve with the 4th circular conical surface.
In some embodiments, the length of the push rod between the third circular conical surface and the 4th circular conical surface is greater than the through-hole
Cylindrical surface length..
In some embodiments, return unit is provided between the push rod and the electric cylinder cylinder body, at the return unit
When under preloading condition, second circular conical surface fits with the 4th circular conical surface, so that the delivery valve is closed, the through-hole is closed
It closes.
In some embodiments, it is provided with guide pin on the electric cylinder cylinder body of first electric cylinder and the second electric cylinder,
The guide groove with guide pin cooperation is provided on the push rod.
In some embodiments, the push rod is screw rod, is additionally provided with rolling in first electric cylinder and the second electric cylinder
Silk nut, the screw rod and the rolled thread nut constitute ball wire bar pair, and the motor drives institute by the ball wire bar pair
State the sliding of piston.
In some embodiments, first solenoid valve, second solenoid valve, third solenoid valve and the 4th solenoid valve are
Normally open type magnetic valve.
In some embodiments, the manual cylinder includes master cylinder and the fluid reservoir that is connected to the master cylinder, described to have
Fail manpower backup functionality double electric cylinders from primary brake system further include pedal travel sensor, the pedal travel sensor
It is electrically connected with the brake monitor.
In some embodiments, first wheel drag is left front brake, and second wheel drag is the right side
Front brake, the third wheel drag are right rear brake, and the four-wheel brakes are left back brake；Or it is described
First wheel drag is left front brake, and second wheel drag is right rear brake, the third wheel drag
For right front brake, the 4th wheel is left back brake.The invention also discloses a kind of using with failure manpower backup
The timesharing of function carries out the braking method of automobile brake, including following braking mode from primary brake system:
Autonomous braking mode: when braking system fault-free and the brake monitor detects the automatically controlled systems of others of vehicle
When system has autonomous brake request, the brake monitor calculates described according to the size of the braking deceleration of autonomous brake request
The target torque of the motor of first electric cylinder and the second electric cylinder, and the motor output torque is controlled, by controlling each electricity
The opening and closing of magnet valve and the positive and negative rotation of the motor are realized to adjust the oil liquid pressure in brake piping to wheel system
The pressurization and decompression of wheel cylinder brake pressure in dynamic device, are completed from main brake；
Failure manpower backup braking mode: make the first brake circuit and the second brake circuit when braking system generates failure
When failing, the oil liquid in manual cylinder enters the oil suction chamber by brake piping, described in the oil liquid promotion in the oil suction chamber
Piston, to generate braking moment in each wheel drag, completes failure manpower backup system so that establishing high pressure in oil outlet chamber
It is dynamic；
Fail-safe braking mode: when the brake monitor detect one of brake circuit break down and other
When autonomous brake request occurs in electric-control system, the brake monitor calculates not according to the braking deceleration size of brake request
Brake force needed for the brake circuit of failure, and it is converted into the target torque of the corresponding motor, by controlling electromagnetism
The opening and closing of valve and the positive and negative rotation of the motor, the oil liquid pressure in brake piping to adjust the brake circuit that do not fail
Power realizes pressurization and decompression to the wheel cylinder brake pressure in wheel drag, completes fail-safe braking.
The beneficial effects of the present invention are:
1. the timesharing with failure manpower backup functionality of the invention is direct through transmission device by motor from primary brake system
Electronic the cylinder piston is driven, building pressure, the time is short, braking response is fast；
2. the timesharing with failure manpower backup functionality of the invention from primary brake system because using two it is mutually indepedent and
The brake circuit being mutually redundant, therefore the high reliablity of braking system, fail-safe ability are strong；
3. of the invention has the timesharing of failure manpower backup functionality from primary brake system because mutually independent using four
Solenoid valve, can be precisely controlled the brake pressure and braking time of each brake by the on-off of solenoid valve, therefore braking system
High reliablity, fail-safe ability are strong；
4. of the invention there is the timesharing of failure manpower backup functionality to provide failure manpower backup braking from primary brake system,
Further improve the reliability and travel safety of braking system.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the timesharing with failure manpower backup functionality of the present invention from primary brake system；
Fig. 2 is a kind of first electric cylinder and the from primary brake system of the timesharing with failure manpower backup functionality of the present invention
The structural schematic diagram of two electric cylinders；
Fig. 3 is the enlarged structure schematic diagram of part A in Fig. 2；
Fig. 4 opens for a kind of timesharing with failure manpower backup functionality from the solenoid valve of primary brake system and power-off time
Distribution diagram.
In figure, 1-brake pedal；2-fulcrum posts；3-pedal travel sensor；4-manual cylinder push rods；5-master cylinders；
6-fluid reservoirs；7-pressure sensors；The first electric cylinder of 8a-；The second electric cylinder of 8b-；9-power supplys；10-brake monitors；
11-the first wheel drag；12-the second wheel drag；13-third wheel drags；14-the four-wheel brakes；
15-the first solenoid valve；16-second solenoid valves；17-third solenoid valves；18-the four solenoid valve；19-braking light switch；
20-malfunction indicator lamp；801-motors；802-shaft couplings；803-retaining rings；804-rolled thread nuts；805-bearings；806—
Push rod；807-O-rings；808-oil inlets；809-oil suction chambers；810-guide pins；811-sealing rings；812-leather cups；
813-pistons；814-oil outlets；815-return units；816-oil outlet chambers；817-electric cylinder cylinder bodies；818-shells；V1—
Transfer valve；V2-delivery valve；V3-cylindrical surface；The first circular conical surface of V1a-；The second circular conical surface of V2a-；V1b-third circular conical surface；
The 4th circular conical surface of V2b-.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 2 referring to Fig.1, a kind of timesharing with failure manpower backup functionality from primary brake system, including brake pedal 1,
Manual cylinder, power supply 9 and brake monitor 10 further include the first electric cylinder 8a and second being electrically connected with the brake monitor 10
Electric cylinder 8b；
The first electric cylinder 8a is identical as the second electric cylinder 8b structure, includes electric cylinder cylinder body 817, is slideably positioned in
Piston 813 in the electric cylinder cylinder body 817 and the motor 801 for driving the piston 813 to slide, described first is electronic
Cylinder 8a and the second electric cylinder 8b further includes push rod 806, and the motor 801 drives the cunning of the piston 813 by the push rod 806
It is dynamic, offer through-hole on the piston 813,806 activity of push rod pass through the through-hole and with the inner sidewall of the through-hole it
Between form the oil passage that passes through for oil liquid, the two sides that the through-hole is located on the push rod 806 are formed with and the piston 813
Auxiliary section through-hole connection and be closed is controlled with merging.Here activity, which passes through, refers to that push rod 806 can be left in through-hole
It moves right, auxiliary section means the amplitude that limitation push rod 806 moves left and right in through-hole, while playing and through-hole is closed and opened
The effect opened.Specifically, through-hole is in off state after auxiliary section is bonded with piston 813, the oil liquid of through-hole two sides cannot pass through logical
Hole circulation, and when auxiliary section is not bonded with piston 813, then the oil liquid of 813 two sides of piston can be circulated by through-hole.
Oil suction chamber 809 and oil outlet chamber 816, the manpower are formed between the piston 813 and the electric cylinder cylinder body 817
Cylinder is connected to by brake piping with the oil suction chamber 809 of the first electric cylinder 8a and the second electric cylinder 8b.That is the first electric cylinder 8a
With oil inlet 808 is offered on the second electric cylinder 8b, manual cylinder is connected to oil inlet 808 by brake piping.Meanwhile electric cylinder
Oil outlet 814 is also provided on cylinder body 817, wheel drag is connect by brake piping with oil outlet 814.Described first is electronic
The oil outlet chamber 816 of cylinder 8a on automobile the first wheel drag 11 and second of wheel drag 12 be connected to formation first system
Dynamic circuit, and between the oil outlet chamber 816 of the first electric cylinder 8a and the first wheel drag 11 and the second wheel drag 12
The first solenoid valve 15 and second solenoid valve 16, the oil outlet chamber 816 in the second electric cylinder 8b are respectively arranged on brake piping
With on automobile third wheel drag 13 and four-wheel brakes 14 be connected to and form the second brake circuit, and second is electronic
It is respectively set on brake piping between the oil outlet chamber 816 and third wheel drag 13 and four-wheel brakes 14 of cylinder 8b
There are third solenoid valve 17 and the 4th solenoid valve 18.
Referring to Fig.1, Fig. 2 and Fig. 4, the working principle of the invention are: the positive and negative rotation of motor 801 can export a pressure wave
It is dynamic, so that the oil liquid pressure in brake piping will appear opposite high pressure and low pressure, i.e., when motor 801 rotates forward, in brake piping
High-voltage oil liquid is formed, and when the reversion of motor 801, low pressure oil liquid is formed in brake piping.
In the present embodiment, solenoid valve is normally open type magnetic valve, below its principle is continued for a normally open type magnetic valve
Explanation.If the wheel cylinder brake pressure of some wheel drag needs to enhance, control for brake can be passed through in short time t2
Device 2 makes corresponding solenoid valve power-off, and then solenoid valve oil circuit is open-minded, is at this time high-pressure brake liquid in brake piping, can pass through solenoid valve
Until corresponding wheel drag, enhances the brake pressure in wheel drag；Other time solenoid valves then electromagnetism valve oil
Road is closed, and is at this time low pressure brake fluid in brake piping, brake can not be transferred to by solenoid valve, the pressure in brake is short
It is remained unchanged in time, the wheel cylinder brake pressure for gradually enhancing wheel drag repeatedly can be achieved in loop cycle.
Conversely, if brake monitor 10 can be passed through in short time t1 when some wheel cylinder brake pressure needs to reduce
Making corresponding solenoid valve power-off, then solenoid valve oil circuit is open-minded, is at this time low pressure brake fluid in main brake pipeline, can pass through solenoid valve
Until brake, reduces the brake pressure in brake；Other time solenoid valves then close by solenoid valve oil circuit, brakes at this time
It is high-pressure brake liquid in pipeline, brake can not be transferred to by solenoid valve, is remained unchanged in the pressure short time in brake,
Loop cycle repeatedly can be achieved to gradually reduce wheel cylinder brake pressure.
It is additionally provided on the brake piping between the manual cylinder and oil suction chamber 809 for detecting the brake piping
Interior hydraulic pressure sensor 7, the pressure sensor 7 are electrically connected with the brake monitor 10.Due to two in the present invention
The presence of brake circuit can provide corresponding so that the brake wheel of two brake circuits is mutually incoherent according to different wheels
Brake force, realize the reasonable distribution of brake force.Simultaneously when a circuit is broken down, another circuit still has braking
Ability, two brake circuits are mutually redundant.The presence of manual cylinder makes timely line control system break down simultaneously, still can be with
It is braked by the way of manpower, substantially increases the reliability of braking.
In the present embodiment, the push rod 806 is screw rod, is also set up in the first electric cylinder 8a and the second electric cylinder 8b
There is rolled thread nut 804, the screw rod and rolled thread nut 804 constitute ball wire bar pair, and the motor 801 passes through the ball screw
Pair drives the sliding of the piston 813.
The timesharing for having failure manpower backup functionality further includes connecting with the electric cylinder cylinder body 817 from primary brake system
The shell 818 connect, electric cylinder cylinder body 817 and shell 818 use bolt-connection, and sealing ring 111 is pressed in joint surface after fastening
Place seals.Ball wire bar pair is supported in shell 818 by a pair of bearings 805.Rolled thread nut is driven by motor 801
804 rotation, so that screw rod 806 pushes piston 813.
Specifically, the inside of the shell 818 is cylindrical hollow configuration, internal includes being connected and diameter successively increases
Big the first cylindrical cavity, the second cylindrical cavity and third cylindrical cavity, first cylindrical cavity and second
It is provided with closing surface between cylindrical cavity, the through-hole passed through for the screw rod 806 is offered on the closing surface；It is set on through-hole
It is equipped with O-ring 807.The shaft shoulder, the rolled thread nut are formed between second cylindrical cavity and the third cylindrical cavity
804 are rotatablely arranged in the third cylinder, and one end of the rolled thread nut 804 is fixed on by a pair of bearings 805
On the shaft shoulder；Retaining ring 803 is used for 805 axially position of bearing and limits the axial movement of rolled thread nut 804.The shell 818
One end close to the piston 813 extends axially outwardly to form boss, the opening of the boss and the electric cylinder cylinder body 817
Sealing is fixedly connected with merging.
Return unit 815 is provided between the push rod 806 and the electric cylinder cylinder body 817, the return unit 815 is in pre-
When under pressure condition, the auxiliary section is bonded with the piston 813 so that the through-hole is closed.The effect of return unit 815 is,
When the request of other electric-control systems terminates braking, band piston 813 and push rod 806 return to initial position.Here preloading condition is
Refer to, in effect of the return unit 815 not by power, a kind of original state for being according to its position.
Guide pin 89 is provided on the electric cylinder cylinder body 817 of the first electric cylinder 8a and the second electric cylinder 8b, it is described to push away
The guide groove with the guide pin 810 cooperation is provided on bar 806.
810 one end of guide pin is inserted into the guide groove of push rod 806, so that push rod 806 can only cannot be around along axial translation
Axial rotation.
As preferable embodiment, referring to Fig. 3, the through-hole includes cylindrical surface V3 and along the both ends of the cylindrical surface V3
To the first circular conical surface V1a and the second circular conical surface V2a of the two sides flaring of the piston 813, described in the through-hole two sides
Auxiliary section includes third circular conical surface V1b compatible with the first circular conical surface V1a and fits with the second circular conical surface V2a phase
The 4th circular conical surface V2b matched, the first circular conical surface V1a match to form transfer valve V1 with third circular conical surface V1b, and described second
Circular conical surface V2a matches to form delivery valve V2 with the 4th circular conical surface V2b.The meaning of transfer valve V1 and delivery valve V2 mentioned here
Think of refers to through the cooperation between each circular conical surface, to realize the open and close to through-hole.
Since the through-hole that the outer diameter of the third circular conical surface V1b and the 4th circular conical surface V2b of push rod 806 are all larger than piston 813 is straight
Piston 813 is clipped in silk when installation by diameter, therefore screw rod 806 can be made into two sections and be threaded (not shown)
Between two conical surfaces of bar and locking screw couples.
As preferable embodiment, the length of the pusher portion between third circular conical surface V1b and the 4th circular conical surface V2b is than living
The long 0.5-1mm of length of the cylindrical surface V3 of the through-hole of plug 813；
The manual cylinder includes master cylinder 5 and the fluid reservoir 6 that is connected to the master cylinder 5, described to have failure manpower backup
Double electric cylinders of function from primary brake system further include pedal travel sensor 3, the pedal travel sensor 3 and the braking
Controller 10 is electrically connected.
Specifically, master cylinder 5 is tandem tandem master cylinder, brake pedal 1 is coupled by fulcrum post 2 with manual cylinder push rod 4；
Fluid reservoir 6 is connected with the ante-chamber of master cylinder 5 and back cavity respectively；The ante-chamber of master cylinder 5 is through the pipe fitting (not shown) on its shell
It is connect with brake piping with the first electric cylinder 8a；The back cavity of master cylinder 5 is through the pipe fitting (not shown) and braking on its shell
Pipeline is connect with the second electric cylinder 8b.
Pedal travel sensor 3 and master cylinder pressure sensor 7 are respectively used for measuring the stroke and master cylinder 5 of brake pedal 1
Pressure, they are connect by signal wire with brake monitor 10.The master that brake monitor 10 is measured according to master cylinder pressure sensor 7
The brake request of cylinder pressure or other electric-control systems, the motor work for controlling each electric cylinder are made to export to corresponding wheel cylinder
Dynamic pressure.Operator brake demand usually reflected by master cylinder pressure sensor 7, and when master cylinder pressure sensor 7 fails,
Can use pedal travel sensor 3 and application when measure in advance braking system PV characteristic (P represent master cylinder pressure, V represent
Master cylinder hydraulic pressure cavity volume, the latter and brake-pedal travel are linear) extrapolate the braking requirement of driver.In this way, master cylinder
Pressure sensor 7 and pedal travel sensor 3 sense redundancy each other, and the reliability of braking system can be improved.
The brake monitor 10 is additionally coupled to other electric-control systems of automobile.Other electric-control systems are such as ADAS or ADS
Deng the electric-control system that can issue autonomous brake request.
The timesharing for having failure manpower backup functionality from primary brake system further includes and 10 electricity of the brake monitor
The braking light switch 19 and malfunction indicator lamp 20 of connection.Braking light switch 19 is used to light the Brake lamp of automobile, if control for brake
When device 10 detects the brake circuit failure that system occurs, alarm is issued by lighting malfunction indicator lamp 20.
The connection type of two brake circuits and wheel can there are many, total is divided into H-type circuit and X-type circuit, H-type time
Road is for example: after two of the connection of two front wheel brakes of the first electric cylinder 8a and automobile, the second electric cylinder 1b and automobile
Take turns brake connection；And X-type circuit is for example: the first electric cylinder 8a is connected to left front brake 11 and right rear brake 13, second
Electric cylinder 8b is connected to left back brake 14 and right front brake 12.
The timesharing with failure manpower backup functionality of the invention mainly includes three kinds of operating modes from primary brake system, i.e.,
From main brake, failure manpower backup braking and fail-safe braking mode.Below to each mode of operation of braking system
Process is illustrated.
1, the brake control method and the course of work under autonomous braking mode
Autonomous braking mode is worked in when system fault-free.
After brake monitor 10 receives brake request, brake force is converted into simultaneously according to the braking deceleration size of request first
Distribute to each wheel；Further, brake monitor 10 calculates the mesh of two brake circuit motors according to each wheel braking force
Torque is marked, and controls 801 output torque of motor of the first electric cylinder 8a and the second electric cylinder 8b.Make motor 801 quickly positive and negative
A pressure oscillation is transferred out, driving ball wire bar pair pushes piston 813 to move when motor rotates forward, which fills through ball screw
It sets and is converted to screw rod thrust, screw rod thrust overcomes 815 active force of return unit to close servo electric jar transfer valve V1, screw rod 806
It is moved together together with servo-electric the cylinder piston 813 so that servo electric jar ante-chamber volume reduces to output pressure to corresponding wheel
Cylinder, driving ball wire bar pair reversion when motor reversal, under acting on return unit 815, the translation of screw rod 806 pulls piston 813 1
It rises and moves right, so that brake-pipe pressure be made to reduce.The quick positive and negative rotation of motor so in a short time, so that it may brake
Pipeline generates a pressure oscillation.
If the wheel cylinder brake pressure of some wheel drag needs to enhance, braking control can be passed through in short time t2
Device 10 processed makes corresponding solenoid valve power-off, and then solenoid valve oil circuit is open-minded, is at this time high-pressure brake liquid in brake piping, can be by electricity
Magnet valve enhances the brake pressure in wheel drag until corresponding wheel drag；Other time solenoid valves then electromagnetism
Valve oil road is closed, and is at this time low pressure brake fluid in brake piping, brake, the pressure in brake can not be transferred to by solenoid valve
Power remains unchanged in the short time, and the wheel cylinder brake pressure for gradually enhancing wheel drag repeatedly can be achieved in loop cycle, realizes certainly
Main brake.
Conversely, if brake monitor 10 can be passed through in short time t1 when some wheel cylinder brake pressure needs to reduce
Making corresponding solenoid valve power-off, then solenoid valve oil circuit is open-minded, is at this time low pressure brake fluid in main brake pipeline, can pass through solenoid valve
Until brake, reduces the brake pressure in brake；Other time solenoid valves then close by solenoid valve oil circuit, brakes at this time
It is high-pressure brake liquid in pipeline, brake can not be transferred to by solenoid valve, is remained unchanged in the pressure short time in brake,
Loop cycle repeatedly can be achieved to gradually reduce wheel cylinder brake pressure, realize from main brake.
Wherein, since servo electric jar oil suction chamber 809 under autonomous braking mode and master cylinder 5 and fluid reservoir 6 are all in braking
Liquid connected state, the movement of push rod 806 and servo-electric the cylinder piston 813 causes servo electric jar oil inlet cavity volume to increase, required
Brake fluid supplemented by fluid reservoir 6 through master cylinder 5 and brake piping.
When other electric-control systems request to terminate braking, brake monitor 10 enables the first electric cylinder 8a and the second electric cylinder 8b
Motor 801 stop working, screw rod 806 return unit 815 effect under move backward so that servo electric jar delivery valve V2 close
And it drives servo-electric the cylinder piston 813 also to move backward and returns to initial position.816 volume of servo electric jar oil outlet chamber increase after its
Brake pressure and corresponding pressure of wheel braking cylinder therefore rapid decrease, its 809 volume of oil suction chamber subtracts in servo electric jar decompression process
Small, the extra brake fluid of servo electric jar oil suction chamber 809 flows back into fluid reservoir 6 through brake piping and master cylinder 5, to realize braking
It releases.
2, fail manpower backup braking mode
If braking system because any failure causes its electric control braking function to completely lose, i.e. two brake circuits all can not be according to
It works by the motor of the first electric cylinder 8a and the second electric cylinder 8b and generates effective brake effect, then manpower backup system can be implemented
It is dynamic.It fails under manpower backup braking mode, if driver's brake pedal 1, pedal force pushes master cylinder via manual cylinder push rod 4
5 piston, the ante-chamber and back cavity of master cylinder 5 set up brake pressure.Cavity pressure reaches the first electricity of a left side through brake piping before master cylinder 5
The oil suction chamber 809 of dynamic cylinder 8a, and cavity pressure reaches the oil suction chamber 809 of the second electric cylinder 8b through brake piping after master cylinder 5.Because of electricity
Motivation does not work, and the second circular conical surface V2a is pressed on the 4th circular conical surface V2b under the effect of 815 precompression of return unit, electric cylinder output
Valve V2 is closed, therefore the oil suction chamber 8010 of servo electric jar and oil outlet chamber 816 are in isolation；At this point, servo electric jar is living
It fills in and is moved under the pressure effect in its oil suction chamber 8010 from master cylinder 5, the pressure that oil outlet chamber 816 generates is defeated through brake piping
Out to the wheel cylinder of corresponding wheel brake, implement manpower backup braking.
3, fail-safe braking mode
When one of brake circuit breaks down, system works in fail-safe braking mode.
If brake monitor 10 detects that a brake circuit failure occurs in system, alarm is issued, into fail-safe
Mode can apply the target torque than system worked well Shi Geng great by the motor to the brake circuit that do not fail to implement to lose
Effect protection braking.At this point, braking of the brake monitor 10 according to pedal travel sensor signal or from other electric-control systems is asked
It asks and calculates target power-assisted or target braking force first, be then allocated to each wheel for the brake circuit that do not fail, then control not
The the first electric cylinder 8a or the second electric cylinder 8b of failure brake circuit export a pressure oscillation, pass through and control corresponding electromagnetism
Valve on-off exports the pressure certain to brake, to realize fail-safe braking to realize that fail-safe is braked.In determination
Under fail-safe braking mode when the target power-assisted or target braking force of each wheel, the torque capacity of corresponding motor should not exceed,
Or it requires to determine according to specific embodiment and referring to relevant laws and regulations.
Brake release under fail-safe braking mode is identical as autonomous braking mode.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of timesharing with failure manpower backup functionality is from primary brake system, including brake pedal (1), manual cylinder, power supply
(9) and brake monitor (10), which is characterized in that further include the first electric cylinder being electrically connected with the brake monitor (10)
(8a) and the second electric cylinder (8b)；
First electric cylinder (8a) is identical as the second electric cylinder (8b) structure, includes electric cylinder cylinder body (817), sliding setting
In the piston (813) in the electric cylinder cylinder body (817) and the motor (801) for driving the piston (813) to slide, institute
Stating the first electric cylinder (8a) and the second electric cylinder (8b) further includes push rod (806), and the motor (801) passes through the push rod
(806) sliding of the piston (813) is driven, offers through-hole on the piston (813), push rod (806) activity passes through
The through-hole simultaneously forms the oil passage passed through for oil liquid between the inner sidewall of the through-hole, is located on the push rod (806)
The two sides of the through-hole, which are respectively formed with, controls the auxiliary section that the through-hole is connected to is closed with merging with the piston (813)；
Oil suction chamber (809) and oil outlet chamber (816) are formed between the piston (813) and the electric cylinder cylinder body (817), it is described
Manual cylinder passes through brake piping respectively and is connected to the oil suction chamber (809) of first electric cylinder (8a) and the second electric cylinder (8b),
The oil outlet chamber (816) of first electric cylinder (8a) and the first wheel drag (11) and the second wheel drag on automobile
(12) it is connected to form the first brake circuit, and the oil outlet chamber (816) of first electric cylinder (8a) and the first wheel system
The first solenoid valve (15) and the second electricity are respectively arranged on brake piping between dynamic device (11) and the second wheel drag (12)
Magnet valve (16), third wheel drag (13) in oil outlet chamber (816) and automobile in second electric cylinder (8b) and the
Four-wheel brakes (14) are connected to form the second brake circuit, and the oil outlet chamber (816) in second electric cylinder (8b) with
Is respectively arranged on the brake piping between third wheel drag (13) and four-wheel brakes (14) on automobile
Three solenoid valves (17) and the 4th solenoid valve (18), on the brake piping between the manual cylinder and the oil suction chamber (809)
It is additionally provided with for detecting pressure sensor hydraulic in the brake piping (7), the pressure sensor (7) and the braking
Controller (10) electrical connection.
2. the timesharing with failure manpower backup functionality according to claim 1 is from primary brake system, which is characterized in that institute
State through-hole include cylindrical surface (V3) and along two sides flaring from the both ends of the cylindrical surface (V3) to the piston (813) first
Circular conical surface (V1a) and the second circular conical surface (V2a), the auxiliary section positioned at the through-hole two sides includes and first circular conical surface
(V1a) compatible third circular conical surface (V1b) and compatible 4th circular conical surface (V2b) with second circular conical surface (V2a),
First circular conical surface (V1a) matches to be formed transfer valve (V1) with third circular conical surface (V1b), second circular conical surface (V2a)
It matches to form delivery valve (V2) with the 4th circular conical surface (V2b).
3. the timesharing with failure manpower backup functionality according to claim 2 is from primary brake system, which is characterized in that institute
The length for stating the push rod (806) between third circular conical surface (V1b) and the 4th circular conical surface (V2b) is greater than the cylindrical surface of the through-hole
(V3) length.
4. the timesharing with failure manpower backup functionality according to claim 1 is from primary brake system, which is characterized in that institute
It states and is provided between push rod (806) and the electric cylinder cylinder body (817) return unit (815), the return unit (815) is in precompressed
When under state, second circular conical surface (V2a) fits with the 4th circular conical surface (V2b), so that the delivery valve (V2) is closed, institute
State through-hole closure.
5. according to right want 4 described in have the timesharing of failure manpower backup functionality from primary brake system, which is characterized in that it is described
Guide pin (810), the push rod are provided on the electric cylinder cylinder body (817) of first electric cylinder (8a) and the second electric cylinder (8b)
(806) guide groove with the guide pin (810) cooperation is provided on.
6. the timesharing with failure manpower backup functionality according to claim 1 is from primary brake system, which is characterized in that institute
Stating push rod (806) is screw rod, is additionally provided with rolled thread nut (804) in first electric cylinder (1a) and the second electric cylinder (1b),
The screw rod and the rolled thread nut (804) constitute ball wire bar pair, and the motor (801) is driven by the ball wire bar pair
The sliding of the piston (813).
7. the timesharing with failure manpower backup functionality according to claim 1 is from primary brake system, which is characterized in that institute
Stating the first solenoid valve (15), second solenoid valve (16), third solenoid valve (17) and the 4th solenoid valve (18) is electricity open in usual
Magnet valve.
8. the timesharing with failure manpower backup functionality according to claim 1 is from primary brake system, which is characterized in that institute
Stating manual cylinder includes master cylinder (5) and the fluid reservoir (6) being connected to the master cylinder (5), described to have failure manpower backup functionality
Double electric cylinders from primary brake system further include pedal travel sensor (3), the pedal travel sensor (3) and the braking
Controller (10) electrical connection.
9. the timesharing with failure manpower backup functionality according to claim 1 is from primary brake system, which is characterized in that institute
Stating the first wheel drag (11) is left front brake, and second wheel drag (12) is right front brake, the third
Wheel drag (13) is right rear brake, and the four-wheel brakes (14) are left back brake；Or first wheel
Brake (11) is left front brake, and second wheel drag (12) is right rear brake, the third wheel drag
It (13) is right front brake, the 4th wheel is left back brake (12).
10. a kind of have the timesharing of failure manpower backup functionality from primary brake system using as described in claim 1-9 is any
Carry out the braking method of automobile brake, which is characterized in that including following braking mode:
Autonomous braking mode: when braking system fault-free and the brake monitor (10) detects the automatically controlled systems of others of vehicle
When system has autonomous brake request, the brake monitor (10) calculates according to the size of the braking deceleration of autonomous brake request
The target torque of the motor (801) of first electric cylinder (8a) and the second electric cylinder (8b), and it is defeated to control the motor (801)
Torque out, by controlling the opening and closing of each solenoid valve and the positive and negative rotation of the motor (801), to adjust brake piping
Interior oil liquid pressure realizes pressurization and decompression to the wheel cylinder brake pressure in wheel drag, completes from main brake；
Failure manpower backup braking mode: when braking system generates failure the first brake circuit is lost with the second brake circuit
When effect, the oil liquid in manual cylinder enters the oil suction chamber (809) by brake piping, and the oil liquid in the oil suction chamber (809) pushes away
The piston (813) are moved, so that establishing high pressure in oil outlet chamber (816), to generate braking moment in each wheel drag, are completed
Manpower backup of failing is braked；
Fail-safe braking mode: when the brake monitor (10) detect one of brake circuit break down and other
When autonomous brake request occurs in electric-control system, the brake monitor (10) calculates according to the braking deceleration size of brake request
Brake force needed for without failure brake circuit out, and it is converted into the target torque of the corresponding motor (801), pass through
The opening and closing of solenoid valve and the positive and negative rotation of the motor (801) are controlled, to adjust the brake pipe for the brake circuit that do not fail
Oil liquid pressure in road realizes pressurization and decompression to the wheel cylinder brake pressure in wheel drag, completes fail-safe braking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910325263.2A CN109955840A (en) | 2019-04-22 | 2019-04-22 | Timesharing with failure manpower backup functionality is from primary brake system and braking method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910325263.2A CN109955840A (en) | 2019-04-22 | 2019-04-22 | Timesharing with failure manpower backup functionality is from primary brake system and braking method |
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| CN109955840A true CN109955840A (en) | 2019-07-02 |
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| CN201910325263.2A Pending CN109955840A (en) | 2019-04-22 | 2019-04-22 | Timesharing with failure manpower backup functionality is from primary brake system and braking method |
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Application publication date: 20190702 |