CN209479644U - A kind of integrated electric energy assisted braking system with novel coupled modes - Google Patents
A kind of integrated electric energy assisted braking system with novel coupled modes Download PDFInfo
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- CN209479644U CN209479644U CN201920238845.2U CN201920238845U CN209479644U CN 209479644 U CN209479644 U CN 209479644U CN 201920238845 U CN201920238845 U CN 201920238845U CN 209479644 U CN209479644 U CN 209479644U
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Abstract
The utility model relates to a kind of integrated electric energy assisted braking systems with novel coupled modes.Including shell, core motor, master cylinder, manpower piston, boosting piston, boosting piston push rod, ball-screw sub-screw, rolling ball screw pair screw nut, brake pedal push rod, hydraulic control unit HCU, electronic control unit ECU, pedal travel sensor.Purpose is to solve the problems such as current brake system structure is complicated, control difficulty is big, integration degree is low, regenerating braking energy recovery utilization rate is low.The utility model uses a kind of novel Hydraulic coupling mode, eliminates reaction dish structure, is simplified the control algolithm of entire braking system, convenient for control.When regenerative braking intervention needs to carry out pedal decoupling, pedal force compensating can be realized by mechanical structure, do not need that pedal sense simulator additionally is arranged, keep system structure more compact.
Description
Technical field
The utility model relates to a kind of braking system, in particular to a kind of integrated electric with novel coupled modes helps
Dynamic braking system.
Background technique
With the continuous development of motorcar electric and intellectualized technology, to brake system of car, more stringent requirements are proposed,
Basic brake force can be generated by not requiring nothing more than braking system, also can be realized a degree of pedal decoupling, cooperation regeneration
Brake energy recovery is realized in braking, improves the continual mileage of electric car；To have enough active brake abilities simultaneously, realize
Faster response speed and more accurate braking pressure control, have the energy as intelligent driving auxiliary system bottom actuator
Power.And traditional vacuum boosting braking system meets these demands due to being difficult to, and using gradually decreasing, electric booster braking system
Using gradually increasing.
By carrying out reasonable structure design, electric booster braking system can be realized a degree of decoupling, Ke Yiying
With realizing Brake energy recovery on electric car；In addition, although electric booster braking system remains hydraulic structure, but due to
Using motor as driving source, response speed and pressure control levels of precision have aobvious compared to traditional vacuum energy assisted braking system
Write promoted, and can independently of driver braking maneuver and realize actively build pressure, have enough active brake abilities, Neng Gouzuo
For the bottom actuator of intelligent driving auxiliary system.But there is also some problems for current electric booster braking system, such as:
Using the structure of reaction tray, the pedal force of driver is coupled with electric boosted by reaction tray, in conventional brake mould
Under formula and the decoupling of brake pedal and hydraulic brake line is not implemented, it is difficult to the regeneration braking capacity of vehicle is given full play to, it is maximum
The recycling braking energy of limit.Simultaneously as pedal force and it is electric boosted coupled by reaction plate, electronic control unit ECU needs root
Balance reaction tray Internal and external cycle deformation according to reaction tray Internal and external cycle deformation quantity control motor, this makes the control algolithm of entire braking system
It is more complicated, and radial force is excessive is easy to make reaction tray excessive deformation to generate security risk.
Or in addition to master cylinder, simulation cylinder and pedal sense simulator are additionally used, structure is complicated, integration degree
It is low, increase the arrangement difficulty of difficulty of processing and system on vehicle.And the system needs to be arranged multiple solenoid valves, makes whole
The control difficulty of a brake fluid system increases.Pedal sense simulator is not used to will affect the pedal sense of driver.
Or the scheme using partly decoupled, decoupling ability is limited, cannot give full play to regenerative braking capability to greatest extent
Recycling braking energy；Using full decoupled scheme, brake pressure is generated by regenerative braking and assist motor completely, then to electricity
The performance requirement of machine is higher.
Therefore want to provide a kind of cancellations reaction tray and pedal sense simulator, simplification structure reduces the electronic of cost and helps
Force system couples pedal force and brake boost using novel Hydraulic coupling scheme, simplified control algorithm, improves mechanical
Structure, pedal decoupling is realized by mechanical structure completely, further increases the integration degree of system.
Summary of the invention
Current brake system structure is complicated, control difficulty is big, integration degree is low, regeneration in order to solve for the utility model
The problems such as Brake energy recovery utilization rate is low, and a kind of integrated electric power brake system with novel coupled modes is provided
System.
The utility model include shell, core motor, master cylinder, manpower piston, boosting piston, boosting piston push rod,
Ball-screw sub-screw, rolling ball screw pair screw nut, brake pedal push rod, hydraulic control unit HCU, electronic control unit ECU, pedal row
Journey sensor；Wherein, core motor and master cylinder are respectively provided at the rear portion of shell, and core motor and master cylinder are coaxially set
It sets；The stator of core motor is fixed on shell, and rotor is coaxially connected by transmission mechanism and rolling ball screw pair screw nut, ball wire
Thick stick pair nut is set in outside ball-screw sub-screw, forms ball screw assembly,；The master cylinder working chamber of master cylinder front is equipped with
Manpower piston and boosting piston are equipped with through-hole inside boosting piston, and manpower piston is located in the through-hole inside boosting piston, and help
Power piston forms clearance fit, builds pressure in master cylinder working chamber；
Boosting piston front end is coaxially connected with boosting piston push rod, inside ball-screw sub-screw and boosting piston push rod
Equipped with through-hole, boosting piston push rod and the through-hole of ball-screw sub-screw are coaxially connected；Brake pedal push rod sequentially pass through shell,
The through-hole of ball-screw sub-screw and the through-hole of boosting piston push rod, are connected with the manpower piston of master cylinder；
The liquid outlet of master cylinder is connected by fluid pressure line with hydraulic control unit HCU；
Electronic control unit ECU is located on shell, and pedal travel sensor is located on brake pedal push rod, and passes through control route
It is connected with electronic control unit ECU；Core motor and hydraulic control unit HCU also pass through control route and electronic control unit ECU phase respectively
Even.
The front end of the through hole of boosting piston push rod is equipped with inward flange；Manpower piston nose is equipped with the shaft shoulder, and shaft shoulder two sides cover respectively
Equipped with pedal sense counterbalance spring, the pedal sense counterbalance spring of side is located at the interior of the manpower piston shaft shoulder and boosting piston push rod
Between flange, other side pedal sense counterbalance spring is between the manpower piston shaft shoulder and boosting piston；If being covered on manpower piston
If two pedal sense counterbalance springs rigidity it is identical, be KC, it is equipped with the intracavitary hydraulic return spring of dynamic master cylinder hydraulic pressure, system
The equivalent global stiffness of brake fluid is K in hydrodynamic and brake pipingp, then KCAnd KpMeet following relationship:
Wherein AassistFor the circular ring shape rear end face area of boosting piston, AinputFor the rounded back end face area of manpower piston.
It is connected between the brake pedal push rod and the manpower piston of master cylinder by manpower piston push rod, braking is stepped on
The rear end of plate push rod and the front end of manpower piston push rod are connected, and the front end of manpower piston push rod is equipped with flange, people when initial position
The flange of power piston push rod front end is abutted with shell front inner wall；Boosting piston push rod front end is equipped with outward flange, outward flange and system
It is equipped with servomechanism return spring between dynamic master cylinder, servomechanism return spring is set in outside boosting piston；Brake pedal pushes away
Pedal push rod return spring is arranged on bar, pedal push rod return spring one end is fixed on brake pedal push rod, and the other end is solid
It is scheduled on shell front.
Master cylinder is worked by the master cylinder that manpower piston, boosting piston, first piston and second piston are separated into front
Chamber and two, rear portion hydraulic cavities, are equipped with hydraulic return spring in two hydraulic cavities, two hydraulic cavities pass through respectively fluid pressure line with
The inlet of hydraulic control unit HCU is connected, and normally open solenoid valve and hydraulic force snesor, normally opened electricity are respectively equipped on fluid pressure line
Magnet valve and hydraulic force snesor pass through control route respectively and are connected with electronic control unit ECU；The four of the hydraulic control unit HCU
A liquid outlet passes through fluid pressure line respectively and is connected with the inlet for the disk brake wheel cylinder being mounted on four wheels of vehicle.
Transmission mechanism between the rotor and rolling ball screw pair screw nut of core motor includes hollow sun gear, several planets
Take turns and be located at the gear ring in inner walls, the rotor coaxial of the sun gear and core motor is connected, the planet
Wheel one end be articulated on rolling ball screw pair screw nut by planet wheel spindle, several planetary gears are uniformly distributed, each planetary gear and meanwhile with
Gear ring engagement on sun gear and inner walls, the deceleration constituted between the rotor of core motor and rolling ball screw pair screw nut increase
Turn round mechanism.
The rolling ball screw pair screw nut is supported in shell by a pair of of tapered roller bearing；The core motor
Rotor is supported in shell by angular contact ball bearing.
The inlet of two hydraulic cavities of master cylinder working chamber and rear portion of master cylinder is connected with fluid reservoir respectively, in braking system
Fluid reservoir can be to three hydraulic cavities fluid infusion when controlling hydrodynamic is lost.
Housing forward end face is equipped with ring flange, using axis is threaded hole there are six center line is uniformly set on ring flange, is convenient for
It is mounted on vehicle or test-bed.
Working principle of the utility model is:
A kind of integrated type electrical brake fluid system actively switching driving style described in the utility model, including basis
Power brake, regenerative braking intervention braking, active brake and failure four kinds of operating modes of backup:
(1) basic power brake mode working principle:
Driver's brake pedal pushes brake pedal push rod and manpower piston push rod to move axially rearward, thus
Push manpower piston.The pedal travel information of the driver of pedal travel sensor acquisition simultaneously, passes through control for pedal travel information
Route processed is transmitted to electronic control unit ECU, and electronic control unit ECU analyzes operator brake according to the pedal travel of driver and is intended to, sentences
Breaking, it is electric boosted to generate at this time, and then issues control signal to core motor.The rotor of core motor rotates, and drives and turns
The sun gear rotation that son is coaxially connected, and then drive the planetary gear rotation being engaged with and revolve, the revolution motion band of planetary gear
The dynamic rolling ball screw pair screw nut rotation being attached thereto, converts rotary motion to the linear motion of ball-screw sub-screw.Ball
Lead screw sub-screw drives boosting piston push rod to move in a straight line backward along axis, so that boosting piston is pushed, it is total with manpower piston
With the brake fluid in the master cylinder working chamber of compression master cylinder, push master cylinder first piston and second piston in rear hydraulic
Chamber establishes brake pressure, and electronic control unit ECU controls two normally open solenoid valve power-off and opens at this time, thus the high pressure in master cylinder
Brake fluid can flow into hydraulic control unit HCU, complete braking process hence into each disk brake wheel cylinder.Driver unclamps
Brake pedal, manpower piston, manpower piston push rod and brake pedal push rod reset under the action of clutch pedal retrun spring；Power-assisted
Piston, boosting piston push rod, ball-screw sub-screw reset under the action of servomechanism return spring.
If the rounded back end face area of manpower piston is Ainput, the circular ring shape rear end face area of boosting piston is Aassist, then
It can be obtained in this case, a kind of assist rate n of electric booster braking system with novel coupled modes of the utility model:
Wherein, P is the hydraulic coupling in the master cylinder working chamber of master cylinder.
(2) regenerative braking intervenes braking mode working principle:
The utility model can be applied on electric car to cooperate regenerative braking to realize Brake energy recovery.
When the brake force needed for driver pedal stroke is smaller i.e. is smaller, electronic control unit ECU is according to pedal travel sensor
The driver pedal travel information of acquisition, total brake force needed for calculating this braking, and according to electric powered motor at this time
The working condition of motor and battery etc., judges that this braking can be realized by regenerative braking completely, and electronic control unit ECU is controlled at this time
Normally open solenoid valve, which is powered, closes, therefore the brake fluid in master cylinder will not enter each disk brake wheel cylinder, i.e., will not produce
Hydraulic braking force is given birth to, brake force needed for vehicle is provided by regenerative braking completely, to recycle braking energy to greatest extent, is improved
Electric car course continuation mileage.
When the brake force needed for driver pedal stroke is larger i.e. is larger, total brake force of vehicle will by regenerative braking force and
Hydraulic braking force generates jointly.In this case, driver's brake pedal, electronic control unit ECU are sensed according to pedal travel
The pedal travel information of device transmitting, total brake force F needed for judging this braking, while electronic control unit ECU is according to electricity at this time
The working condition of electrical automobile power motor and battery etc., judges the regeneration system that power motor can be provided in this braking process
Power FR, to obtain the hydraulic braking force F provided needed for this brakingH, then FH=F-FR, electronic control unit ECU is according to driver
Pedal travel and required hydraulic braking force FH, control signal is issued to core motor, and the rotor of core motor rotates, in turn
Rolling ball screw pair screw nut rotation is driven by sun gear, planetary gear, the straight line that rotary motion is converted into ball-screw sub-screw is transported
It is dynamic.Ball-screw sub-screw pushes boosting piston push rod to move in a straight line backward along axis, so that boosting piston is pushed, with manpower
Piston compresses the brake fluid in the master cylinder working chamber of master cylinder jointly, so that brake pressure is established in master cylinder hydraulic cavities,
At this time electronic control unit ECU control normally open solenoid valve power-off open, thus the high-pressure brake liquid in master cylinder can flow into it is hydraulic
Control unit HCU, the hydraulic braking force F needed for being generated into each wheel-braking cylinderH, complete to brake together with regenerative braking
Journey.When vehicle braking is close to stagnation of movement, regenerative braking is exited, by hydraulic braking force FHCompleting remaining braking process stops vehicle
It sails.
(3) active brake mode working principle:
When driver does not have brake pedal, if electronic control unit ECU by other onboard sensors (such as radar,
Camera, velocity sensor, distance measuring sensor etc.) the information judgement of transmitting needs actively to implement at this time brake force or other are controlled
When device (such as emergency braking system, automated driving system) issues active brake request, braking system enters active brake
Mode.
Electronic control unit ECU receives the information that each onboard sensor etc. is come by control route transmitting, calculating vehicle at this time at this time
Initiative brake needed for, and then control signal is issued to core motor, so that core motor is generated corresponding torque and revolving speed,
By deceleration torque increase mechanism and ball-screw auxiliary driving, the braking in the master cylinder working chamber of boosting piston compression master cylinder is pushed
Liquid, and then brake pressure is established in master cylinder hydraulic cavities.At this point, electronic control unit ECU control normally open solenoid valve power-off is opened,
High-pressure brake liquid in master cylinder hydraulic cavities, which can enter hydraulic control unit HCU and then enter each disk brake wheel cylinder, to be generated
Braking moment.When carrying out active boost, the flange of manpower piston push rod front end is abutted with the inner wall of procapsid, therefore manpower is living
Plug will not move under action of hydraulic force, to effectively prevent the influence to active boost effect.Under active brake mode,
If electronic control unit ECU detects that driver has the movement of brake pedal, active brake mode is immediately exited from, is converted into
Conventional brake mode.
(4) fail backup mode working principle:
The utility model has failure back-up job mode, when core motor or the failure of certain driving member, or entirely
When failure that system is powered down, system can enter failure back-up job mode, under this mode driver can by brake pedal, according to
Pressure is built in master cylinder by mechanically and hydraulically structure, provides enough brake force for vehicle, guarantees the safety of system and reliable
Property.
If electronic control unit ECU detects that core motor or certain transmission parts break down, electronic control unit ECU is immediately to normal
The fluid pressure line that master cylinder hydraulic cavities lead to hydraulic control unit HCU is connected in open electromagnetic valve power-off.Driver steps on system at this time
Dynamic pedal, brake pedal push rod, which directly passes through manpower piston push rod, to be pushed in the master cylinder working chamber of manpower piston compression master cylinder
Brake fluid the brake fluid in master cylinder hydraulic cavities is passed through to push the first piston and second piston of master cylinder
Normally open solenoid valve is pushed into hydraulic control unit HCU, and then enters in each disk brake wheel cylinder and generate brake force.Due to initial shape
Ball screw assembly, screw front end face is abutted with procapsid inner wall under state, therefore the hydraulic coupling in the master cylinder working chamber of master cylinder
After raising, abut ball screw assembly, screw front end face rapidly with procapsid inner wall, boosting piston is not subjected to displacement, therefore not shadow
Ring the pressurization of failure backup.And when whole system power down failure, two normally open solenoid valves open automatic power down, can still protect
Demonstrate,prove being normally carried out for above-mentioned failure backup procedure.
Pedal force compensation work principle
Regenerative braking is intervened in braking mode, identical i.e. in pedal travel compared to the automobile of not regenerative braking capability
In the identical situation of total brake force, required hydraulic braking force FHIt will reduce, so as to cause acting on operator brake pedal
Counter-force will reduce, in order to compensate for this part pedal reaction force reduction amount, it is described in the utility model be provided with pedal sense compensate bullet
Spring, two spring rates are identical, are KCIf in two return springs of master cylinder, hydraulic cavities in brake fluid and brake piping
The equivalent global stiffness of brake fluid is Kp, then participated in and reduced hydraulic counter force in order to compensate for due to regenerative braking, KCAnd KpIt should meet
Certain relationship.
Refering to Fig. 9, since regenerative braking is intervened, electronic control unit ECU reduces hydraulic braking force F by control core motorH,
I.e. the movement travel of core motor driving boosting piston will reduce, if the reduction amount of boosting piston movement travel is Δ Sassist, phase
The movement travel for the brake master cylinder piston answered will reduce Δ Soutput:
The then hydraulic counter force reduction amount Δ F of braking systemHAre as follows:
Then act on the pedal reaction force reduction amount Δ F on manpower pistonHinputAre as follows:
Identical pedal sense when therefore in order to guarantee that driver obtains with the intervention of no regenerative braking, by the way that pedal sense is arranged
Feel counterbalance spring to Δ FHinputIt compensates.Since the movement travel of boosting piston reduces Δ Sassist, then compared to without again
The case where raw braking intervention, the progressive error between manpower piston and boosting piston is Δ Sassist.It is stepped on rear side of this section of stroke official post
Plate feels counterbalance spring by compression Δ Sassist, preceding survey pedal sense counterbalance spring is stretched Δ Sassist, therefore two springs
The resultant force F of counter-forceCAre as follows:
FC=FC1+FC2=KCΔSassist+KCΔSassist=2KCΔSassist
And refering to Fig. 9 it is found that FCDirection it is identical as the direction of hydraulic counter force, therefore be situated between in order to compensate for due to regenerative braking
Hydraulic counter force reduction amount Δ F on manpower piston caused by enteringHinput, Δ F need to be enabledHinputWith FCIt is equal, it may be assumed that
ΔFHinput=FC
Pedal sense simulation spring stiffness K can then be obtainedCAnd KpRelationship:
Therefore, spring rate is simulated by rationally designing and choosing pedal sense, pedal sense simulator can not be used,
In regenerative braking intervention, obtain driver and the identical pedal sense of pure hydraulic braking.
The utility model has the beneficial effects that
The utility model uses a kind of novel Hydraulic coupling mode, eliminates reaction dish structure, makes entire braking system
The control algolithm of system is simplified, convenient for control.When regenerative braking intervention needs to carry out pedal decoupling, pass through mechanical structure
Pedal force compensating can be realized, do not need that pedal sense simulator additionally is arranged, keep system structure more compact.Except master cylinder
Outside, do not need additionally to be arranged other for decoupling hydraulic cylinder, reduce system development costs, and further simplify system knot
Structure, convenient for being arranged on vehicle.It does not need that solenoid valve progress pedal decoupling and failure backup is additionally arranged, reduces electronic control unit
ECU reduces algorithm development cost to the control difficulty of whole system, works relatively reliable.The brake pedal force of driver and
Brake boost is coupled by hydraulic way, is pushed master cylinder to build pressure jointly with assist motor, be can make full use of driver pedal power,
Motor performance is required to reduce, reduces control electric current.Can by control assist motor constantly regulate hydraulic braking force with
Cooperate regenerative braking, give full play to the regeneration braking capacity of electric car, improves electric car course continuation mileage.It can be realized line traffic control
The active brake of change, fast response time, pressure control is accurate, has the energy as intelligent driving auxiliary system bottom actuator
Power.
Detailed description of the invention
Fig. 1 is the utility model overall structure diagram.
Fig. 2 is the utility model partial structural diagram.
Fig. 3 is the utility model manpower piston structure schematic diagram.
Fig. 4 is the utility model boosting piston structural schematic diagram one.
Fig. 5 is the utility model boosting piston structural schematic diagram two.
Fig. 6 is the utility model boosting piston pusher structure schematic diagram one.
Fig. 7 is the utility model boosting piston pusher structure schematic diagram two.
Fig. 8 is the utility model manpower piston push rod structural schematic diagram.
Fig. 9 is the pedal force compensation principle schematic diagram of the utility model.
1, shell 2, core motor 3, master cylinder 4, manpower piston 5, boosting piston
6, boosting piston push rod 7, ball-screw sub-screw 8, rolling ball screw pair screw nut
9, brake pedal push rod 10, hydraulic control unit HCU 11, electronic control unit ECU
12, pedal travel sensor 13, master cylinder working chamber 14, manpower piston push rod
15, stator 16, rotor 17, first piston 18, second piston 19, hydraulic cavities
20, hydraulic return spring 21, normally open solenoid valve 22, hydraulic force snesor
23, disk brake wheel cylinder 24, pedal sense counterbalance spring 25, servomechanism return spring
26, pedal push rod return spring 27, sun gear 28, planetary gear 29, gear ring
30, planet wheel spindle 31, tapered roller bearing 32, angular contact ball bearing 33, bearing locating piece
34, fluid reservoir 35, ring flange.
Specific embodiment
It please refers to shown in Fig. 1 to Fig. 9:
The utility model includes shell 1, core motor 2, master cylinder 3, manpower piston 4, boosting piston 5, boosting piston
Push rod 6, ball-screw sub-screw 7, rolling ball screw pair screw nut 8, brake pedal push rod 9, hydraulic control unit HCU10, automatically controlled list
First ECU11, pedal travel sensor 12；Wherein, core motor 2 and master cylinder 3 are respectively provided at the rear portion of shell 1, hollow electricity
Machine 2 and master cylinder 3 are coaxially disposed；The master cylinder working chamber 13 of 3 front of master cylinder is equipped with manpower piston 4 and boosting piston 5, helps
Through-hole is equipped with inside power piston 5, manpower piston 4 is located in the through-hole inside boosting piston 5, forms gap with boosting piston 5 and matches
It closes, builds pressure in master cylinder working chamber 13；
5 front end of boosting piston is equipped with imperial palace via through holes, is interference fitted with boosting piston push rod 6, coaxial to be connected, ball-screw
Through-hole is equipped with inside sub-screw 7 and boosting piston push rod 6, boosting piston push rod 6 is matched with the 7 through-hole interference of ball-screw sub-screw
It closes, it is coaxial to be connected；Brake pedal push rod 9 is located at outside shell 1, and manpower piston push rod 14 is located at enclosure interior, and brake pedal pushes away
The front end that the rear end of bar 9 passes through shell 1 and manpower piston push rod 14 is spirally connected connected, and the front end of manpower piston push rod 14 is equipped with convex
Edge, the flange of 14 front end of manpower piston push rod is abutted with 1 front inner wall of shell when initial position, and manpower piston push rod 14 is successively worn
The through-hole of ball-screw sub-screw 7 and the through-hole of boosting piston push rod 6 are crossed, is connected with the manpower piston 4 of master cylinder 3；
The stator 15 of core motor 2 is fixed on shell 1, and rotor 16 is same by transmission mechanism and rolling ball screw pair screw nut 8
Axis connection, rolling ball screw pair screw nut 8 are set in outside ball-screw sub-screw 7, ball screw assembly, are formed, by ball screw assembly, spiral shell
The rotary motion of mother 8 is converted to the linear motion of ball-screw sub-screw 7；
Electronic control unit ECU11 is located on shell 1, and pedal travel sensor 12 is located on brake pedal push rod 9, and passes through control
Route processed is connected with electronic control unit ECU11, and electronic control unit ECU11 receives the data information of pedal travel sensor 12；Hollow electricity
Machine 2 and hydraulic control unit HCU10 are also connected by controlling route with electronic control unit ECU11 respectively, electronic control unit ECU11 control
The start and stop of core motor 2 and revolving speed and torque receive the data information of hydraulic control unit HCU10.
Master cylinder 3 is separated into the master of front by manpower piston 4, boosting piston 5, first piston 17 and second piston 18
Cylinder working chamber 13 and two, rear portion hydraulic cavities 19, are equipped with hydraulic return spring 20 in two hydraulic cavities 19, two hydraulic cavities 19
Liquid outlet passes through fluid pressure line respectively and is connected with the inlet of hydraulic control unit HCU10, is respectively equipped on fluid pressure line normally opened
Solenoid valve 21 and hydraulic force snesor 22, normally open solenoid valve 21 and hydraulic force snesor 22 pass through control route and automatically controlled list respectively
First ECU11 is connected, and electronic control unit ECU11 control normally open solenoid valve 21 switches on and off, and receiving liquid pressure sensor 22 detects
The data information of fluid pressure line hydraulic coupling；Four liquid outlets of the hydraulic control unit HCU10 pass through fluid pressure line respectively
It is connected with the inlet for the disk brake wheel cylinder 23 being mounted on four wheels of vehicle.
The through-hole of boosting piston push rod 6 is equipped with inward flange；4 front end of manpower piston is equipped with the shaft shoulder, and shaft shoulder two sides are arranged respectively
There is pedal sense counterbalance spring 24, the pedal sense counterbalance spring 24 of side is located at 4 shaft shoulder of manpower piston and boosting piston push rod 6
Inward flange between, other side pedal sense counterbalance spring 24 be located at 4 shaft shoulder of manpower piston and the small interior via through holes of boosting piston 5 it
Between；It is K if the rigidity for two pedal sense counterbalance springs 24 being arranged on manpower piston 4 is identicalC, it is equipped with dynamic master cylinder hydraulic pressure
The equivalent global stiffness of brake fluid is K in hydraulic return spring 20, brake fluid and brake piping in chamber 19p, then KCAnd KpMeet
Following relationship:
Wherein AassistFor the circular ring shape rear end face area of boosting piston 5, AinputFor the rounded back end face face of manpower piston 4
Product.
6 front end of boosting piston push rod is equipped with outward flange, and servomechanism return spring is equipped between outward flange and master cylinder 3
25, servomechanism return spring 25 is set in outside boosting piston 5；Pedal push rod return bullet is arranged on brake pedal push rod 9
Spring 26,26 one end of pedal push rod return spring are fixed on brake pedal push rod 9, and the other end is fixed on 1 front of shell.
Transmission mechanism between the rotor 16 and rolling ball screw pair screw nut 8 of core motor 2 includes hollow sun gear 27, four
A planetary gear 28 and the gear ring 29 being located on 1 inner wall of shell, the rotor 16 of the sun gear 27 and core motor 2 are coaxial
It is connected, described 28 one end of planetary gear is articulated on rolling ball screw pair screw nut 8 by planet wheel spindle 30, and four planetary gears 28 are uniform
Distribution, each planetary gear 28 are engaged with the gear ring 29 on 1 inner wall of sun gear 27 and shell simultaneously, constitute turning for core motor 2
Deceleration torque increase mechanism between son 16 and rolling ball screw pair screw nut 8, around certainly while each planetary gear 28 revolves around sun gear 27
30 rotation of planet wheel spindle of body drives rolling ball screw pair screw nut 8 to rotate.
The rolling ball screw pair screw nut 8 passes through a pair of of tapered roller bearing 31 and is supported in shell 1；The hollow electricity
The rotor 16 of machine 2 is supported in shell 1 by angular contact ball bearing 32, and angular contact ball bearing 32 is positioned by bearing locating piece 33.
The inlet of two hydraulic cavities 19 of master cylinder working chamber 13 and rear portion of master cylinder 3 is connected with fluid reservoir 34 respectively,
When brake system liquid stream is lost, fluid reservoir 34 can be to the intracavitary fluid infusion of master cylinder 3.
1 front end face of shell is equipped with ring flange 35, uniformly sets by center line of axis there are six threaded hole on ring flange 35,
It is easily installed on vehicle or test-bed.
Working principle of the utility model is:
A kind of integrated type electrical brake fluid system actively switching driving style described in the utility model, including basis
Power brake, regenerative braking intervention braking, active brake and failure four kinds of operating modes of backup:
(1) basic power brake mode working principle:
Driver's brake pedal pushes brake pedal push rod 9 and manpower piston push rod 14 to move axially rearward, from
And push manpower piston 4.Pedal travel sensor 12 acquires the pedal travel information of driver simultaneously, and pedal travel information is led to
It crosses control route and is transmitted to electronic control unit ECU11, electronic control unit ECU11 analyzes operator brake according to the pedal travel of driver
Be intended to, judgement should generate at this time it is electric boosted, and then issue control signal to core motor 2.The rotor 16 of core motor 2 revolves
Turn, the sun gear 27 being coaxially connected with rotor 16 is driven to rotate, and then drives 28 rotation of planetary gear being engaged with and revolve, row
The revolution motion of star-wheel 28 drives the rolling ball screw pair screw nut 8 being attached thereto to rotate, and converts ball screw assembly, for rotary motion
The linear motion of screw rod 7.Ball-screw sub-screw 7 drives boosting piston push rod 6 to move in a straight line backward along axis, to push
Brake fluid in boosting piston 5, with manpower piston 4 jointly the master cylinder working chamber 13 of compression master cylinder 3, pushes master cylinder 3
First piston 17 and second piston 18 establish brake pressure in rear hydraulic chamber 19, and electronic control unit ECU11 controls two often at this time
The power-off of open electromagnetic valve 21 is opened, so that the high-pressure brake liquid in master cylinder 3 can flow into hydraulic control unit HCU10, thus
Braking process is completed into each disk brake wheel cylinder 23.Driver loosens the brake, manpower piston 4, manpower piston push rod
14 and brake pedal push rod 9 resetted under the action of pedal push rod return spring 26；Boosting piston 5, boosting piston push rod 6,
Ball-screw sub-screw 7 resets under the action of servomechanism return spring 25.
If the rounded back end face area of manpower piston 4 is Ainput, the circular ring shape rear end face area of boosting piston 5 is Aassist,
It then can be obtained in this case, a kind of assist rate of electric booster braking system with novel coupled modes of the utility model
N:
Wherein, P is the hydraulic coupling in the master cylinder working chamber 13 of master cylinder 3.
(2) regenerative braking intervenes braking mode working principle:
The utility model can be applied on electric car to cooperate regenerative braking to realize Brake energy recovery.
When the brake force needed for driver pedal stroke is smaller i.e. is smaller, electronic control unit ECU11 is sensed according to pedal travel
The driver pedal travel information that device 12 acquires, total brake force needed for calculating this braking, and according to electric car at this time
The working condition of power motor and battery etc., judges that this braking can be realized by regenerative braking completely, at this time electronic control unit
ECU11 controls the energization of normally open solenoid valve 21 and closes, therefore the brake fluid in master cylinder 3 will not enter each disc type brake device wheel
Cylinder 23 will not generate hydraulic braking force, brake force needed for vehicle is provided by regenerative braking completely, to recycle to greatest extent
Braking energy improves electric car course continuation mileage.
When the brake force needed for driver pedal stroke is larger i.e. is larger, total brake force of vehicle will by regenerative braking force and
Hydraulic braking force generates jointly.In this case, driver's brake pedal, electronic control unit ECU11 are passed according to pedal travel
The pedal travel information that sensor 12 transmits, total brake force F needed for judging this braking, while electronic control unit ECU11 is according to this
When electric powered motor motor and battery etc. working condition, judge that power motor in this braking process can be provided
Regenerative braking force FR, to obtain the hydraulic braking force F provided needed for this brakingH, then FH=F-FR, electronic control unit ECU11 root
According to driver pedal stroke and required hydraulic braking force FH, control signal is issued to core motor 2, and core motor 2 turns
Son 16 rotates, and then drives rolling ball screw pair screw nut 8 to rotate by sun gear 27, planetary gear 28, converts ball for rotary motion
The linear motion of lead screw sub-screw 7.Ball-screw sub-screw 7 pushes boosting piston push rod 6 to move in a straight line backward along axis, from
And boosting piston 5 is pushed, the brake fluid in the master cylinder working chamber 13 of master cylinder 3 is compressed jointly with manpower piston 4, thus making
Dynamic 3 hydraulic cavities 19 of master cylinder establish brake pressure, and electronic control unit ECU11 controls the power-off of normally open solenoid valve 21 and opens at this time, to make
High-pressure brake liquid in dynamic master cylinder 3 can flow into hydraulic control unit HCU10, hydraulic needed for generating into each wheel-braking cylinder
Brake force FH, braking process is completed together with regenerative braking.When vehicle braking is close to stagnation of movement, regenerative braking is exited, by hydraulic
Brake force FHCompleting remaining braking process makes vehicle lay-off.
(3) active brake mode working principle:
When driver does not have brake pedal, if electronic control unit ECU11 is (thunderous by other onboard sensors
Reach, camera, velocity sensor, distance measuring sensor etc.) the information judgement of transmitting need actively to implement at this time brake force or other
When control device (such as emergency braking system, automated driving system) issues active brake request, braking system enters actively
Braking mode.
At this time electronic control unit ECU11 receive each onboard sensor etc. by control route transmitting come information, calculating at this time
Initiative brake needed for vehicle, and then issue control signal to core motor 2, make core motor 2 generate corresponding torque and
Revolving speed pushes boosting piston 5 to compress the master cylinder working chamber of master cylinder 3 by deceleration torque increase mechanism and ball-screw auxiliary driving
Brake fluid in 13, and then brake pressure is established in 3 hydraulic cavities 19 of master cylinder.At this point, electronic control unit ECU11 control is normally opened
The power-off of solenoid valve 21 is opened, the high-pressure brake liquid in 3 hydraulic cavities 19 of master cylinder can enter hydraulic control unit HCU10 so that into
Enter each disk brake wheel cylinder 23 and generates braking moment.When carrying out active boost, the flange of 14 front end of manpower piston push rod with
The inner wall of procapsid abuts, therefore manpower piston 4 will not move under action of hydraulic force, to effectively prevent to active boost
The influence of effect.Under active brake mode, if electronic control unit ECU11 detects that driver has the dynamic of brake pedal
Make, then immediately exits from active brake mode, be converted into conventional brake mode.
(4) fail backup mode working principle:
The utility model has failure back-up job mode, when core motor 2 or the failure of certain driving member, or entirely
When failure that system is powered down, system can enter failure back-up job mode, under this mode driver can by brake pedal, according to
Pressure is built in master cylinder 3 by mechanically and hydraulically structure, provides enough brake force for vehicle, guarantees the safety of system and reliable
Property.
If electronic control unit ECU11 detects that core motor 2 or certain transmission parts break down, electronic control unit ECU11 is vertical
Normally open solenoid valve 21 is powered off, connects the fluid pressure line that 3 hydraulic cavities 19 of master cylinder lead to hydraulic control unit HCU10.This
When driver's brake pedal, brake pedal push rod 9 directly by manpower piston push rod 14 push manpower piston 4 compression braking
Brake fluid in the master cylinder working chamber 13 of master cylinder 3 will be made to push the first piston 17 and second piston 18 of master cylinder 3
Brake fluid in dynamic 3 hydraulic cavities 19 of master cylinder is pushed into hydraulic control unit HCU10 by normally open solenoid valve 21, and then enters each disc type
Brake force is generated in wheel-braking cylinder 23.Since 7 front end face of ball-screw sub-screw is abutted with procapsid inner wall under original state,
Therefore after the hydraulic coupling in the master cylinder working chamber 13 of master cylinder 3 increases, make 7 front end face of ball-screw sub-screw and procapsid
Inner wall abuts rapidly, and boosting piston 5 is not subjected to displacement, therefore does not influence the pressurization of failure backup.And when whole system is fallen
When electricity failure, two normally open solenoid valves 21 open automatic power down, still can guarantee being normally carried out for above-mentioned failure backup procedure.
Claims (7)
1. a kind of integrated electric energy assisted braking system with novel coupled modes, it is characterised in that: including shell, hollow electricity
Machine, master cylinder, manpower piston, boosting piston, boosting piston push rod, ball-screw sub-screw, rolling ball screw pair screw nut, braking
Pedal push rod, hydraulic control unit HCU, electronic control unit ECU, pedal travel sensor；Wherein, core motor and master cylinder point
It is not located at the rear portion of shell, core motor and master cylinder coaxial arrangement；The stator of core motor is fixed on shell, and rotor is logical
It is coaxially connected with rolling ball screw pair screw nut to cross transmission mechanism, rolling ball screw pair screw nut is set in outside ball-screw sub-screw, shape
At ball screw assembly,；The master cylinder working chamber of master cylinder front is equipped with manpower piston and boosting piston, is equipped with inside boosting piston
Through-hole, manpower piston are located in the through-hole inside boosting piston, form clearance fit with boosting piston, build in master cylinder working chamber
Pressure；
Boosting piston front end is coaxially connected with boosting piston push rod, is equipped with inside ball-screw sub-screw and boosting piston push rod
Through-hole, boosting piston push rod and the through-hole of ball-screw sub-screw are coaxially connected；Brake pedal push rod sequentially passes through shell, ball
The through-hole of lead screw sub-screw and the through-hole of boosting piston push rod, are connected with the manpower piston of master cylinder；
The liquid outlet of master cylinder is connected by fluid pressure line with hydraulic control unit HCU；
Electronic control unit ECU is located on shell, and pedal travel sensor is located on brake pedal push rod, and passes through control route and electricity
Unit ECU is controlled to be connected；Core motor and hydraulic control unit HCU are also connected by controlling route with electronic control unit ECU respectively.
2. a kind of integrated electric energy assisted braking system with novel coupled modes according to claim 1, feature
Be: the through-hole of boosting piston push rod is equipped with inward flange；Manpower piston nose is equipped with the shaft shoulder, and shaft shoulder two sides are arranged with pedal respectively
Feel counterbalance spring, the pedal sense counterbalance spring of side be located at the manpower piston shaft shoulder and boosting piston push rod inward flange it
Between, other side pedal sense counterbalance spring is between the manpower piston shaft shoulder and boosting piston；If be arranged on manpower piston two
The rigidity of a pedal sense counterbalance spring is identical, is KC, be equipped with the intracavitary hydraulic return spring of dynamic master cylinder hydraulic pressure, brake fluid with
And the equivalent global stiffness of brake fluid is K in brake pipingp, then KCAnd KpMeet following relationship:
Wherein AassistFor the circular ring shape rear end face area of boosting piston, AinputFor the rounded back end face area of manpower piston.
3. a kind of integrated electric energy assisted braking system with novel coupled modes according to claim 2, feature
It is: is connected between the brake pedal push rod and the manpower piston of master cylinder by manpower piston push rod, brake pedal
The rear end of push rod and the front end of manpower piston push rod are connected, and the front end of manpower piston push rod is equipped with flange, manpower when initial position
The flange of piston push rod front end is abutted with shell front inner wall；Boosting piston push rod front end is equipped with outward flange, outward flange and braking
Servomechanism return spring is equipped between master cylinder, servomechanism return spring is set in outside boosting piston；Brake pedal push rod
On be arranged with pedal push rod return spring, pedal push rod return spring one end is fixed on brake pedal push rod, and the other end is fixed
In shell front.
4. a kind of integrated electric energy assisted braking system with novel coupled modes according to claim 1, feature
Be: master cylinder by manpower piston, boosting piston, first piston and second piston be separated into front master cylinder working chamber and
Two, rear portion hydraulic cavities, are equipped with hydraulic return spring in two hydraulic cavities, two hydraulic cavities pass through respectively fluid pressure line with it is hydraulic
The inlet of control unit HCU is connected, and normally open solenoid valve and hydraulic force snesor, normally open solenoid valve are respectively equipped on fluid pressure line
Pass through control route respectively with hydraulic force snesor to be connected with electronic control unit ECU；Four of the hydraulic control unit HCU go out
Liquid mouth passes through fluid pressure line respectively and is connected with the inlet for the disk brake wheel cylinder being mounted on four wheels of vehicle.
5. a kind of integrated electric energy assisted braking system with novel coupled modes according to claim 1, feature
Be: the transmission mechanism between the rotor and rolling ball screw pair screw nut of core motor includes hollow sun gear, several planetary gears
And it is located at the gear ring in inner walls, the rotor coaxial of the sun gear and core motor is connected, the planetary gear
One end is articulated on rolling ball screw pair screw nut by planet wheel spindle, and several planetary gears are uniformly distributed, each planetary gear simultaneously and too
Gear ring engagement on sun wheel and inner walls, constitutes the deceleration torque increase between the rotor of core motor and rolling ball screw pair screw nut
Mechanism.
6. a kind of integrated electric energy assisted braking system with novel coupled modes according to claim 5, feature
Be: the rolling ball screw pair screw nut is supported in shell by a pair of of tapered roller bearing；The core motor turns
Son is supported in shell by angular contact ball bearing.
7. a kind of integrated electric energy assisted braking system with novel coupled modes according to claim 1, feature
Be: housing forward end face is equipped with ring flange, using axis is threaded hole there are six center line is uniformly set on ring flange, can install
On vehicle or test-bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920238845.2U CN209479644U (en) | 2019-02-26 | 2019-02-26 | A kind of integrated electric energy assisted braking system with novel coupled modes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920238845.2U CN209479644U (en) | 2019-02-26 | 2019-02-26 | A kind of integrated electric energy assisted braking system with novel coupled modes |
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| Publication Number | Publication Date |
|---|---|
| CN209479644U true CN209479644U (en) | 2019-10-11 |
Family
ID=68134114
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|---|---|---|---|
| CN201920238845.2U Withdrawn - After Issue CN209479644U (en) | 2019-02-26 | 2019-02-26 | A kind of integrated electric energy assisted braking system with novel coupled modes |
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| Country | Link |
|---|---|
| CN (1) | CN209479644U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109624957A (en) * | 2019-02-26 | 2019-04-16 | 吉林大学 | A kind of integrated electric energy assisted braking system with novel coupled modes |
| CN111301385A (en) * | 2020-03-17 | 2020-06-19 | 安徽理工大学 | Integrated novel line control hydraulic braking system |
| CN112739929A (en) * | 2020-12-24 | 2021-04-30 | 华为技术有限公司 | Hydraulic device, braking system and braking control method |
-
2019
- 2019-02-26 CN CN201920238845.2U patent/CN209479644U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109624957A (en) * | 2019-02-26 | 2019-04-16 | 吉林大学 | A kind of integrated electric energy assisted braking system with novel coupled modes |
| CN109624957B (en) * | 2019-02-26 | 2021-03-09 | 吉林大学 | Integrated electric power-assisted brake system with novel coupling mode |
| CN111301385A (en) * | 2020-03-17 | 2020-06-19 | 安徽理工大学 | Integrated novel line control hydraulic braking system |
| CN111301385B (en) * | 2020-03-17 | 2022-05-13 | 安徽理工大学 | Integrated wire control hydraulic braking system |
| CN112739929A (en) * | 2020-12-24 | 2021-04-30 | 华为技术有限公司 | Hydraulic device, braking system and braking control method |
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