CN103507800B - EHB and vehicle electric brake fluid system - Google Patents
EHB and vehicle electric brake fluid system Download PDFInfo
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- CN103507800B CN103507800B CN201310453629.7A CN201310453629A CN103507800B CN 103507800 B CN103507800 B CN 103507800B CN 201310453629 A CN201310453629 A CN 201310453629A CN 103507800 B CN103507800 B CN 103507800B
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Abstract
The invention discloses a kind of EHB and vehicle electric brake fluid system, wherein, piezoelectric type oil passage control valve in EHB includes piezoelectric element, displacement amplifying mechanism, piston, return spring, spool, plug screw and housing, piezoelectric element is deformed in the axial direction by applying electric field, and output loads promotes piston to move.Displacement amplifying mechanism includes at least two-stage displacement equations unit, every grade of displacement amplifying unit includes displacement equations lever, salient point, fixed hinge and base, by lever principle, piston thin tail sheep amount is amplified, promotes spool to move together with return spring and be switched on or switched off into and out of hydraulic fluid port.Piezoelectric type oil passage control valve, as the entering of EHB (EHB), oil return control valve, improves the pressure controlled frequency of EHB Braking system and control accuracy.Piezoelectric type oil passage control valve and the EHB system of the present invention can improve the braking ability of vehicle, economic performance and security performance.
Description
Technical field
The present invention relates to a kind of EHB and vehicle electric brake fluid system, belong to vehicle brake technology's neck
Territory.
Background technology
Brakes is one of important component part of automobile, is directly connected to comprehensive vehicle performance and the security of the lives and property,
Including running brake, parking brake and auxiliary brake.Running brake is automobile primary brake, typically uses drum
Formula or disk-type friction mode of braking, be converted into heat energy by the kinetic energy of automobile, potential energy by friction, it is achieved car deceleration or system
Dynamic purpose.Although conventional hydraulic formula, vapour-pressure type running brake disclosure satisfy that the requirements of existing brake legislation, but
It is to also exist that response speed is slow, can not actively regulate, be not easy to the weak points such as integrating control, is not suitable for current automobile
Demand for development.
EHB (EHB) is the one in line control brake system, by brake pedal module, Electronic Control mould
Block, hydraulic control module etc. form, and eliminate being joined directly together between brake pedal and wheel cylinder, with electric wire as information
Transmission medium, control unit is intended to control actuator according to brake pedal position sensor signal identification operator brake and moves
Making, the brake fluid making the high-pressure brake liquid in accumulator enter in wheel cylinder or wheel cylinder returns to reservoir, it is achieved to wheel braking
The control of power.EHB system has compact conformation, superior performance and is easily integrated the features such as control, compensate for traditional braking
Deficiency in system structure principle, represents one of development trend of running brake.At present, EHB system is universal
Use electromagnetic valve as actuator, by making spool move to solenoid energising or power-off, be switched on or switched off hydraulic tube
Road.But, there is hysteresis in the energising of solenoid, power-off, affects EHB Braking system pressure controlled dynamic
Step response, and then have impact on control accuracy and the braking ability of EHB system.
Piezoelectric type oil passage control valve based on inverse piezoelectric effect has high dynamic response performance, can improve brake pressure
The frequency of regulation and control accuracy.But, to so far, also rarely have the electronics mentioned with piezoelectric type oil passage control valve
Brake fluid system.Additionally, braking energy regeneration is the important measures that the energy saved by automobile, and emergency brake function is always
It is a subject matter of line control brake system.
Summary of the invention
The technical problem to be solved is the defect overcoming prior art, it is provided that a kind of piezoelectric type oil passage control valve,
It can improve the pressure controlled frequency of EHB Braking system and control accuracy, thus improves the dynamic response of EHB system
Energy and braking ability.
In order to solve above-mentioned technical problem, the present invention adopts the technical scheme that: a kind of piezoelectric type oil passage control valve, its bag
Include displacement amplifying mechanism, plug screw, housing, piston, return spring, spool and it produces in poppet shaft when applying external electric field
Mechanically deform on direction thus form the piezoelectric element of the axial motive force in the direction, plug screw is threadedly attached in
On housing, piston and piezoelectric element are positioned at housing, and displacement amplifying mechanism includes at least two-stage displacement equations unit, every grade
Displacement equations unit includes displacement equations lever, fixed hinge and salient point, and the fixing end of displacement equations lever is with corresponding
Fixed hinge is flexibly connected so that its free end rotates around hinged place, and described salient point is arranged on the freedom of displacement equations lever
On end, and this salient point and portion between salient point and fixed hinge on the displacement equations lever of adjacent displacement equations unit
Position contacts, and the salient point on the displacement equations lever of the displacement equations unit of described final stage abuts against with spool, described
The portion that is connected on the displacement equations lever of first order displacement equations unit between salient point and fixed hinge, the side of piston
On position, the opposite side of described piston abuts against with piezoelectric element, and housing has the oil-in and oil-out being connected,
Spool also is located in housing, and this spool and housing are provided with a pair restriction, and it cooperates and disconnects when contacting
Hydraulic path between oil-in and oil-out, connects the hydraulic path between oil-in and oil-out, return when disengaged
One end of spring abuts against with plug screw, and the other end abuts against with spool to promote spool to move axially.
Further, it is main by piezoceramics layer and be respectively formed at piezoceramics layer two that described piezoelectric element has many groups
The piezoelectric unit part that the positive electrode layer of side and positive electrode layer are constituted, and positive electrode layer and positive electrode layer be electrically connected with successively.
Further, described housing being provided with connection plug, described positive electrode layer and positive electrode layer are electrically connected with successively
Afterwards be connected plug and be connected.
Further, being provided with base in described housing, described displacement amplifying mechanism includes two-stage displacement equations unit,
The displacement equations lever of first order displacement equations unit is hinged on base by corresponding fixed hinge, second level displacement
The displacement equations lever of amplifying unit is hinged on housing by corresponding fixed hinge.
The present invention also provides for a kind of EHB using this piezoelectric type oil passage control valve, and it includes wheel braking
Device, reservoir, accumulator, oil-feed control valve, oil return control valve, control unit and pressure transducer, described piezoelectricity
Formula oil passage control valve has two, and one of them is oil-feed control valve, and another is oil return control valve, described oil-feed control valve
Oil-in be connected with the oil-out of accumulator, the oil-out of oil-feed control valve is connected with the wheel cylinder of wheel drag,
The oil-in of oil return control valve is connected with the wheel cylinder of wheel drag, and the oil-out of oil return control valve is connected with reservoir
Connecing, pressure transducer is connected on wheel drag, and the signal output part of pressure transducer is connected with control unit,
It is for gathering the brake fluid pressure of wheel drag and being fed back to control unit, and control unit is according to pressure transducer
The control signal fed back select to control oil-feed control valve and oil return control valve dead electricity.
Further, also including that accumulator pumps drive mechanism, this accumulator pumping drive mechanism includes that energy storage pressure senses
Device, oil pump, check valve and be connected to the electromagnetic clutch of the work of control oil pump between transmission for vehicles and oil pump, accumulation of energy
Device pressure transducer is connected on accumulator, and the signal output part of energy storage pressure sensor is connected with control unit
Connecing, it is for gathering the brake fluid pressure in accumulator and be fed back to control unit, described control unit and electromagnetism from
The input that controls of clutch is connected for the brake fluid pressure letter that control unit is fed back according to energy storage pressure sensor
Number select control its obtain dead electricity, described reservoir, oil pump, check valve are connected with described accumulator.
Further, described accumulator pumping drive mechanism also includes auxiliary motor, described auxiliary motor and oil pump phase
Connecting, described control unit is connected with auxiliary motor phase control so that the braking fed back according to energy storage pressure sensor
The lower limit signal behavior of hydraulic coupling controls its work.
Present invention also offers a kind of vehicle electric brake fluid system, it uses this EHB, and electricity
Sub-brake fluid system has four, respectively the near front wheel brake fluid system, off-front wheel brake fluid system, left rear wheel liquid
Pressure brakes and off hind wheel brake fluid system, wherein, the reservoir of four EHBs all shares one,
Accumulator all shares one, and control unit shares one.
Further, the wheel drag of described the near front wheel brake fluid system and the wheel system of off-front wheel brake fluid system
It is communicated with front-wheel balanced solenoid valve, the wheel drag of described left rear wheel brake fluid system between the in-line of dynamic device
And between the in-line of off hind wheel brake fluid system wheel drag, it is communicated with trailing wheel balanced solenoid valve, described front-wheel
Balanced solenoid valve and trailing wheel balanced solenoid valve are all connected with described control unit phase control to control it respectively to obtain dead electricity.
Further, also include emergency brake mechanism, this emergency brake mechanism include braking simulation master cylinder, brake pedal,
Pedal sense simulator and counterbalance valve, braking simulation master cylinder has front end chamber and room, rear end, and described reservoir is respectively with front
End room is connected with room, rear end, front end chamber connect after counterbalance valve respectively with the wheel drag of the near front wheel brake fluid system and
The wheel drag of off-front wheel brake fluid system is connected, and described room, rear end is connected with pedal sense simulator.
After have employed technique scheme, the present invention has a following beneficial effect:
1, the piezoelectric element of the present invention applies electric field in piezoelectric ceramics polarised direction, in electric field action lower piezoelectric pottery meeting
There is mechanically deform or produce mechanical stress；When external electric field removes, these deformation or stress also can disappear therewith, piezoelectricity
Pottery is directly proportional to the size of electric field by deflection produced by electric field action or stress value, thus promote spool and housing it
Between a pair restriction engage or separate, the hydraulic path disconnecting or connecting between oil-in and oil-out, control brake fluid
Pressure size.Use displacement amplifying mechanism, it is possible to the thin tail sheep amount of piston be amplified.The piezoelectric type of this kind of structure
Oil passage control valve has high dynamic response performance, can improve frequency and the control accuracy of brake pressure regulation, very
It is suitable as the oil passage control valve of EHB.
2, the EHB of the present invention uses piezoelectric type oil passage control valve based on inverse piezoelectric effect to be oil-feed control
Valve processed and oil return control valve, by controlling oil-feed control valve and the action of oil return control valve, it is achieved the essence to wheel braking force
Really control, improve dynamic response performance and the braking ability of EHB system.
3, the emergency brake mechanism of the present invention makes the vehicle electric brake fluid system of the present invention have emergency brake function,
When vehicle electric brake fluid system lost efficacy, driver can make braking simulation master cylinder by trampling brake pedal energetically
Brake fluid in front end chamber enters wheel drag and the off-front wheel hydraulic pressure system of the near front wheel brake fluid system by counterbalance valve
The wheel drag of dynamic system, it is achieved automobile emergent brake function.
4, the vehicle electric brake fluid system of the present invention has wheel braking selection function, the system of current axis left and right wheels
When power needs independent control, front-wheel balanced solenoid valve obtains electric, disconnects the connection of left and right sides brake hydraulic line；Current axis
When the brake force of left and right wheels need not independently control, front-wheel balanced solenoid valve dead electricity, connect left and right sides brake hydraulic line,
The brake force making front axle left and right sides wheel is consistent.In like manner, the work of the left and right wheel of rear axle is also as described above.
5, the oil pump of the accumulator pumping drive mechanism of the present invention is driven to main with transmission output shaft during braking, motor
It is driven to auxiliary, is beneficial to reclaim braking energy, reduce energy expenditure.
Accompanying drawing explanation
Fig. 1 is the structural representation of the vehicle electric brake fluid system of the present invention；
Fig. 2 is the structural representation of the piezoelectric type oil passage control valve of the present invention；
Fig. 3 is the structural representation of the accumulator pumping drive mechanism of the present invention.
Detailed description of the invention
It is clearly understood to make present disclosure be easier to, below according to specific embodiment and combine accompanying drawing, to this
Invention is described in further detail.
As in figure 2 it is shown, a kind of piezoelectric type oil passage control valve, it include displacement amplifying mechanism, plug screw 27, housing 32,
Piston 34, return spring 28, spool 29 and when apply external electric field its produce on spool 29 axial direction machinery change
Shape thus form the piezoelectric element 35 of the axial motive force in the direction, plug screw 27 is threadedly attached on housing 32,
Piston 34 and piezoelectric element 35 are positioned at housing 32, and displacement amplifying mechanism includes at least two-stage displacement equations unit, often
Level displacement amplifying unit includes displacement equations lever 30, fixed hinge 46 and salient point 30-1, displacement equations lever 30
Fixing end is flexibly connected with corresponding fixed hinge 46 so that its free end rotates around hinged place, and salient point 30-1 is arranged on
On the free end of displacement equations lever 30, and the displacement equations thick stick of this salient point 30-1 and adjacent displacement equations unit
On bar 30, the position between salient point 30-1 and fixed hinge 46 contacts, and the displacement of the displacement equations unit of final stage is put
Salient point on big lever 30 abuts against with spool 29, and the side of piston 34 is connected to the position of first order displacement equations unit
Move on the position amplifying on lever 30 between salient point 30-1 and fixed hinge 46, the opposite side of piston 34 and piezoelectric element
35 abut against, and housing 32 has the oil-in 38 and oil-out 37 being connected, and spool 29 also is located in housing 32,
Being provided with a pair restriction on this spool 29 and housing 32, it cooperates and disconnects oil-in 38 He when contacting
Hydraulic path between oil-out 37, connects the hydraulic path between oil-in 38 and oil-out 37 when disengaged, returns
One end of position spring 28 abuts against with plug screw 27, and the other end abuts against with spool 29 to promote spool 29 to move axially.
Plug screw 27 can use hexagonal socket head plug, and bolt 27 is in order to stop brake fluid seepage.
Return spring 28 can be cylindroid helical-coil compression spring, is installed on inside plug screw 27 and between spool 29, initially
State i.e. bears certain compression stress, the restriction inside the restriction of spool 29 and housing 32 is forced together, disconnect into
The hydraulic channel of hydraulic fluid port 38 and oil-out 37, and its pre-compression force can regulate by being threaded in or out plug screw 27.
Return spring 28 is installed in spool 29 one end, and one end closely can be connect inside housing 32 by No. 1 sealing ring 31
Touch, its end face carry piezoelectric element 35 deformation produce thrust, the restriction on spool 29 for being located at flange thereon,
Contact with the restriction inside housing 32, then disconnect the hydraulic channel of oil-in 38 and oil-out 37；With in housing 32
The restricted portion of side from, then connect the hydraulic channel of oil-in 38 and oil-out 37.Piston 34 is by No. 2 sealing rings
With housing 32 interior side contacts, side is displacement amplifying mechanism, and side is piezoelectric element 35.
As in figure 2 it is shown, piezoelectric element 35 to have many groups main by piezoceramics layer and be respectively formed at piezoceramics layer
The piezoelectric unit part that the positive electrode layer of both sides and positive electrode layer are constituted, and positive electrode layer and positive electrode layer the most electrically connect
Connect.Be provided with on housing 32 connection plug 36, positive electrode layer and positive electrode layer be electrically connected with successively after be connected plug 36
It is connected.Piezoelectric element 35 can use the multiple structure of piezoelectric thin layer technology, all positive electrode layers, positive electrode layer to divide
Do not link together with lead-in wire, supply 0 volt or the voltage of 160 volts as required by connecting plug 36.General 3 lis
The long piezoelectric element 35 of rice can comprise the piezoelectric ceramic thin sheet that 300 multi-layered thickness are 80 microns.
When loading 160 volts of voltages on piezoelectric element 35 and producing mechanically deform, promote piston 34 to move, and then overcome back
Position spring 28 elastic force promotes spool 29 to move, and connects the hydraulic channel of oil-in 38 and oil-out 37；Work as piezoelectric element
During 35 0 volt of voltage of loading, piezoelectric element 35 deformation disappears, under the effect of return spring 28, and the current limliting of spool 29
Portion is pressed in the restriction inside housing 32, disconnects the hydraulic channel of oil-in 38 and oil-out 37.
Displacement amplifying mechanism utilizes lever principle to be amplified the thin tail sheep amount of piston 34, meets spool 29 moving displacement
Demand.
As it is shown in figure 1, a kind of EHB using this piezoelectric type oil passage control valve, it includes wheel braking
Device 23, reservoir 3, accumulator 7, oil-feed control valve 15, oil return control valve 16, control unit and pressure transducer
17, piezoelectric type oil passage control valve has two, and one of them is oil-feed control valve 15, and another is oil return control valve 16,
The oil-in of oil-feed control valve 15 is connected with the oil-out of accumulator 7, the oil-out of oil-feed control valve 15 and wheel system
The wheel cylinder of dynamic device 23 is connected, and the oil-in of oil return control valve 16 is connected with the wheel cylinder of wheel drag 23, oil return
The oil-out of control valve 16 is connected with reservoir 3, and pressure transducer 17 is connected on wheel drag 23, and
The signal output part of pressure transducer 17 is connected with control unit, and it is for gathering the brake fluid pressure of wheel drag 23
Power is also fed back to control unit, the control signal that control unit is fed back according to pressure transducer 17 select to control into
Oil control valve 15 and oil return control valve 16 dead electricity.Pressure transducer, both can detect in wheel drag 23 in real time
Brake fluid pressure, as the feedback signal of braking pressure control；Also can be as the reference signal of EHB thrashing.With
As a example by one wheel, when wheel brake pressure is relatively low, control unit feeds oil control valve 15 and powers, in accumulator 7
Brake fluid enter wheel drag 23 wheel cylinder in, brake pressure increase；When brake pressure is higher, control unit
Giving back to oil control valve 16 power, the brake fluid in the wheel cylinder of wheel drag 23 returns to reservoir 3, and brake pressure reduces；
When brake pressure is consistent with desired value, oil-feed control valve 15 and oil return control valve 16 all dead electricity, disconnect wheel drag
23 with reservoir 3, the connection of accumulator 7, keep brake pressure, by constantly quickly regulation, by brake pressure control
System is in the preferred range.If the force value that pressure transducer 17 provides differs relatively big with target pressure value, then control list
Unit thinks that EHB system exists fault, is reported to the police by malfunction indicator lamp in time, reminds driver to note；It addition, it is initial
The piezoelectric element dead electricity of oil-feed control valve 15 during state, disconnects into and out of hydraulic fluid port, and the brake fluid in accumulator 7 can not enter
Enter wheel drag 23；When the piezoelectric element 35 of oil-feed control valve 15 obtains electric, connect into and out of hydraulic fluid port, accumulator 7
In brake fluid enter wheel drag 23, the brake pressure of wheel drag 23 increases；During original state, oil return controls
Piezoelectric element 35 dead electricity of valve 16, disconnects into and out of hydraulic fluid port, and the brake fluid in wheel drag 23 wheel cylinder can not enter
Reservoir 3；When the piezoelectric element 35 of oil return control valve 16 obtains electric, connect into and out of hydraulic fluid port, at reservoir 3 suction
Effect under, brake fluid in wheel drag 23 wheel cylinder enters reservoir 3, and wheel brake pressure reduces.
Above-mentioned reservoir 3 uses expansion type reservoir, and its inside brake liquid can be by oil pump 6 pump to accumulator 7, it is possible to logical
Crossing self suction to be sucked back by the brake fluid in wheel drag 23 wheel cylinder, accumulator 7 is high pressure accumulator, which is provided with
Pressure transducer 8, when accumulator 7 insufficient pressure, oil pump 6 works and supplements brake fluid in accumulator 7.
As it is shown on figure 3, EHB also includes that accumulator pumps drive mechanism, the pumping of this accumulator drives
Mechanism includes energy storage pressure sensor 8, oil pump 6, check valve 43 and is connected between transmission for vehicles and oil pump 6
The electromagnetic clutch 42 of control oil pump 6 work, energy storage pressure sensor 8 is connected on accumulator 7, and accumulator
The signal output part of pressure transducer 8 is connected with control unit, and it is for gathering the brake fluid pressure in accumulator 7 also
Being fed back to control unit, control unit is connected for control unit root with the control input of electromagnetic clutch 42
The brake fluid pressure signal behavior fed back according to energy storage pressure sensor 8 controls it and obtains dead electricity, reservoir 3, oil pump 6,
Check valve 43 is connected with described accumulator 7.44 is overflow valve, when preventing oil pump 6 or auxiliary motor 45 from working,
Hypertonia in accumulator 7, plays a protective role to system.Accumulator pumping drive mechanism also includes auxiliary motor
45, auxiliary motor 45 is connected with oil pump 6, and control unit is connected so that according to storage with auxiliary motor 45 phase control
The lower limit signal behavior of the brake fluid pressure that energy device pressure transducer 8 is fed back controls its work.Oil pump 6 side is installed
There is auxiliary motor 45, work can be driven by auxiliary motor 45；Side is by electromagnetic clutch 42, variator
Parts (driven gear 41, driving gear 39 and transmission output shaft 40) are connected.When car braking and braking are strong
When spending bigger, electromagnetic clutch 42 obtains electric interlock, and transmission output shaft 40 drives oil pump 6 to work, and now, both can return
Receive braking energy, alleviate brake burden, motor 45 can be reduced again and drive the energy consumption produced, when oil pump 6 is to brake
Transmission output shaft 40 is driven to main, and motor 45 is driven to auxiliary, only when accumulator 7 pressure reaches low extreme value
Motor 45 just drives work.
As it is shown in figure 1, a kind of vehicle electric brake fluid system, the EHB that its employing is above-mentioned, and
EHB has four, respectively the near front wheel brake fluid system 100, off-front wheel brake fluid system 200,
Left rear wheel brake fluid system 300 and off hind wheel brake fluid system 400, wherein, four EHBs
Reservoir 3 all shares one, and accumulator 7 all shares one, and control unit shares one.Each electro-hydraulic brake system
The operation principle of system is such as EHB above.
As it is shown in figure 1, the wheel drag 23 of the near front wheel brake fluid system 100 and off-front wheel brake fluid system 200
Wheel drag 23 in-line between be communicated with front-wheel balanced solenoid valve 22, left rear wheel brake fluid system 300
Wheel drag 23 and off hind wheel brake fluid system 400 wheel drag 23 in-line between be communicated with after
Wheel balanced solenoid valve 21, front-wheel balanced solenoid valve 22 and trailing wheel balanced solenoid valve 21 all with described control unit phase control
Connect to control it respectively to obtain dead electricity.This structure has wheel braking and selects function, the brake force of current axis left and right wheels
When needing independent control, front-wheel balanced solenoid valve 22 obtains electric, disconnects the connection of left and right sides brake hydraulic line；Current axis
When the brake force of left and right wheels need not independently control, front-wheel balanced solenoid valve 22 dead electricity, connect left and right sides brake fluid pressure
Pipeline, the brake force making front axle left and right sides wheel is consistent, and in like manner, the work of the left and right wheel of rear axle is also as described above.
As it is shown in figure 1, vehicle electric brake fluid system also includes emergency brake mechanism, this emergency brake mechanism includes system
Dynamic model intends master cylinder 2, brake pedal 1, pedal sense simulator 4 and counterbalance valve 5, and braking simulation master cylinder 2 has front end chamber
With room, rear end, reservoir 3 is connected with front end chamber and room, rear end respectively, respectively with left front after front end chamber connection counterbalance valve 5
The wheel drag 23 of wheel brake fluid system 100 is connected with the wheel drag 23 of off-front wheel brake fluid system 200
Logical, room, rear end is connected with pedal sense simulator 4.The emergency brake mechanism of the present invention makes the vehicle electric liquid of the present invention
Pressure brakes has emergency brake function, and when vehicle electric brake fluid system lost efficacy, driver is by trampling energetically
Brake pedal 1 can make the brake fluid in the front end chamber of braking simulation master cylinder 2 enter the near front wheel hydraulic pressure system by counterbalance valve 5
The wheel drag 23 of dynamic system 100 and the wheel drag 23 of off-front wheel brake fluid system 200, it is achieved vehicle should
Anxious braking function.
Particular embodiments described above, to present invention solves the technical problem that, technical scheme and beneficial effect entered
One step describes in detail, be it should be understood that the specific embodiment that the foregoing is only the present invention, is not limited to
The present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in protection scope of the present invention.
Claims (8)
1. an EHB, it is characterised in that: it include wheel drag (23), reservoir (3),
Accumulator (7), oil-feed control valve (15), oil return control valve (16), control unit and pressure transducer (17), enter
Oil control valve (15) and oil return control valve (16) all use piezoelectric type oil passage control valve, and piezoelectric type oil passage control valve includes
Displacement amplifying mechanism, plug screw (27), housing (32), piston (34), return spring (28), spool (29) and work as
Apply its generation of external electric field mechanically deform on spool (29) axial direction thus form the axial motive force in the direction
Piezoelectric element (35), plug screw (27) is threadedly attached on housing (32), piston (34) and piezoelectric element
(35) being positioned at housing (32), displacement amplifying mechanism includes at least two-stage displacement equations unit, every grade of displacement equations list
Unit includes displacement equations lever (30), fixed hinge (46) and salient point (30-1), consolidating of displacement equations lever (30)
Fixed end is flexibly connected so that its free end rotates around hinged place with corresponding fixed hinge (46), described salient point (30-1)
It is arranged on the free end of displacement equations lever (30), and this salient point (30-1) and adjacent displacement equations unit
Displacement equations lever (30) upper position between salient point (30-1) and fixed hinge (46) contact, final stage
Salient point on the displacement equations lever (30) of displacement equations unit abuts against with spool (29), described piston (34)
Side be connected to the upper salient point (30-1) of displacement equations lever (30) and the fixed hinge (46) of first order displacement equations unit
Between position on, the opposite side of described piston (34) abuts against with piezoelectric element (35), and housing is opened on (32)
Having the oil-in (38) and oil-out (37) being connected, spool (29) also is located in housing (32), this spool (29)
Being provided with a pair restriction with on housing (32), it cooperates and disconnects oil-in (38) and fuel-displaced when contacting
Hydraulic path between mouth (37), connects the hydraulic path between oil-in (38) and oil-out (37) when disengaged,
One end of return spring (28) abuts against with plug screw (27), and the other end and spool (29) abut against to promote spool
(29) moving axially, the oil-in of described oil-feed control valve (15) is connected with the oil-out of accumulator (7), enters
The oil-out of oil control valve (15) is connected with the wheel cylinder of wheel drag (23), the oil-feed of oil return control valve (16)
Mouth is connected with the wheel cylinder of wheel drag (23), and the oil-out of oil return control valve (16) is connected with reservoir (3)
Connecing, pressure transducer (17) is connected on wheel drag (23), and the signal output of pressure transducer (17)
End is connected with control unit, and its brake fluid pressure being used for gathering wheel drag (23) also is fed back to control list
Unit, control unit selects control oil-feed control valve (15) and return according to the control signal that pressure transducer (17) is fed back
Oil control valve (16) dead electricity；When the brake fluid pressure of wheel drag (23) is relatively low, control unit is to oil-feed
Control valve (15) is powered, and the brake fluid in accumulator (7) enters in the wheel cylinder of wheel drag (23), braking pressure
Power increases；When the brake fluid pressure of wheel drag (23) is higher, control unit gives back to oil control valve (16) power supply,
Brake fluid in the wheel cylinder of wheel drag (23) returns to reservoir (3), and brake pressure reduces；When wheel drag (23)
Brake fluid pressure consistent with desired value time, oil-feed control valve (15) and oil return control valve (16) all dead electricity, disconnect car
Wheel brake (23) and reservoir (3), the connection of accumulator (7), keep brake pressure, by the most quickly
Regulation, by braking pressure control in the preferred range；
Also include accumulator pump drive mechanism, this accumulator pumping drive mechanism include energy storage pressure sensor (8),
Oil pump (6), check valve (43) and be connected to what control oil pump (6) between transmission for vehicles and oil pump (6) worked
Electromagnetic clutch (42), energy storage pressure sensor (8) is connected on accumulator (7), and energy storage pressure passes
The signal output part of sensor (8) is connected with control unit, and it is used for gathering the brake fluid pressure in accumulator (7) also
Being fed back to control unit, described control unit is connected for controlling with the control input of electromagnetic clutch (42)
Unit controls it according to the brake fluid pressure signal behavior that energy storage pressure sensor (8) is fed back and obtains dead electricity, described storage
Liquid device (3), oil pump (6), check valve (43) are connected with described accumulator (7).
EHB the most according to claim 1, it is characterised in that: described piezoelectric element (35)
There is positive electrode layer and positive electrode layer structure that many groups mainly by piezoceramics layer and are respectively formed at piezoceramics layer both sides
The piezoelectric unit part become, and positive electrode layer and positive electrode layer be electrically connected with successively.
EHB the most according to claim 2, it is characterised in that: on described housing (32)
Be provided with connection plug (36), described positive electrode layer and positive electrode layer be electrically connected with successively after be connected plug (36)
It is connected.
EHB the most according to claim 1, it is characterised in that: in described housing (32)
Being provided with base, described displacement amplifying mechanism includes two-stage displacement equations unit, the displacement of first order displacement equations unit
Amplify lever (30) to be hinged on base by corresponding fixed hinge (46), the position of second level displacement equations unit
Move amplification lever (30) to be hinged on housing (32) by corresponding fixed hinge (46).
EHB the most according to claim 1, it is characterised in that: the pumping of described accumulator drives
Mechanism also includes that auxiliary motor (45), described auxiliary motor (45) are connected with oil pump (6), described control
Unit is connected with auxiliary motor (45) phase control so that the brake fluid fed back according to energy storage pressure sensor (8)
The lower limit signal behavior of pressure controls its work.
6. a vehicle electric brake fluid system, it is characterised in that: it uses electronics liquid as claimed in claim 1
Press brakes, and EHB has four, respectively before the near front wheel brake fluid system (100), the right side
Wheel brake fluid system (200), left rear wheel brake fluid system (300) and off hind wheel brake fluid system (400),
Wherein, the reservoir (3) of four brake fluid systems all shares one, and accumulator (7) all shares one, controls single
Unit shares one.
Vehicle electric brake fluid system the most according to claim 6, it is characterised in that: described the near front wheel liquid
The wheel drag (23) of pressure brakes (100) and the wheel drag (23) of off-front wheel brake fluid system (200)
In-line between be communicated with front-wheel balanced solenoid valve (22), the car of described left rear wheel brake fluid system (300)
Connect between the in-line of the wheel drag (23) of wheel brake (23) and off hind wheel brake fluid system (400)
It is connected with trailing wheel balanced solenoid valve (21), described front-wheel balanced solenoid valve (22) and trailing wheel balanced solenoid valve (21) equal
It is connected with described control unit phase control to control it respectively to obtain dead electricity.
Vehicle electric brake fluid system the most according to claim 7, it is characterised in that: also include emergency brake
Mechanism, this emergency brake mechanism includes braking simulation master cylinder (2), brake pedal (1), pedal sense simulator (4)
With counterbalance valve (5), braking simulation master cylinder (2) has front end chamber and room, rear end, and described reservoir (3) is respectively with front
End room is connected with room, rear end, front end chamber connect after counterbalance valve (5) respectively with the near front wheel brake fluid system (100)
Wheel drag (23) is connected with the wheel drag (23) of off-front wheel brake fluid system (200), described
Room, rear end is connected with pedal sense simulator (4).
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| CN201310453629.7A CN103507800B (en) | 2013-09-29 | 2013-09-29 | EHB and vehicle electric brake fluid system |
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| CN201310453629.7A CN103507800B (en) | 2013-09-29 | 2013-09-29 | EHB and vehicle electric brake fluid system |
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| CN103507800A CN103507800A (en) | 2014-01-15 |
| CN103507800B true CN103507800B (en) | 2016-08-17 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104442777A (en) * | 2014-11-27 | 2015-03-25 | 江苏理工学院 | Chassis wheel edge distributive type independent brake executing mechanism and chassis brake system |
| JP6197808B2 (en) * | 2015-02-27 | 2017-09-20 | 株式会社アドヴィックス | Brake control device for vehicle |
| CN106627541B (en) * | 2016-09-30 | 2023-06-09 | 三环集团有限公司 | Active hydraulic braking system of automobile |
| US10980170B2 (en) * | 2017-12-01 | 2021-04-20 | Deere & Company | Piezo actuated nozzle control valve |
| CN108332885A (en) * | 2018-03-06 | 2018-07-27 | 中国航发哈尔滨东安发动机有限公司 | A kind of monitoring of structures of power |
| CN108501921B (en) * | 2018-05-04 | 2019-04-02 | 吉林大学 | A kind of hydraulic line control brake system and its brake control method with double pressure sources |
| CN110985157B (en) * | 2019-12-25 | 2021-05-18 | 潍柴动力股份有限公司 | Exhaust brake system, control method thereof and vehicle |
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| US4762300A (en) * | 1985-02-19 | 1988-08-09 | Nippondenso Co., Ltd. | Control valve for controlling fluid passage |
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| CN103507800A (en) | 2014-01-15 |
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