CN203511632U - Electro-hydraulic composite braking system with electric brake booster and drive-by-wire brake function - Google Patents
Electro-hydraulic composite braking system with electric brake booster and drive-by-wire brake function Download PDFInfo
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- CN203511632U CN203511632U CN201320726268.4U CN201320726268U CN203511632U CN 203511632 U CN203511632 U CN 203511632U CN 201320726268 U CN201320726268 U CN 201320726268U CN 203511632 U CN203511632 U CN 203511632U
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Abstract
The utility model discloses an electro-hydraulic composite braking system with an electric brake booster and a drive-by-wire brake function. The electro-hydraulic composite braking system comprises a plurality of work modes, wherein the electric brake booster mode is as follows: a brake pedal inputs brake fluid into a main cylinder to generate pressure from a manpower cylinder; meanwhile, an electronic control unit controls a motor to output torque to boost; the brake pressure is output to a wheel cylinder; a regenerative braking mode is as follows: opening and closing of an electromagnetic valve are controlled through the electronic control unit; the brake pedal inputs the brake fluid into a simulating cavity of a pedal stroke simulator to generate pressure from the manpower cylinder, and provides feeling of the brake pedal, if the vehicle decelerating requirements cannot be met by virtue of regenerative braking, the electronic control unit controls the motor to output torque, so that the main cylinder outputs brake pressure to the wheel cylinder to assist frictional braking; driving brake is that the electronic control unit controls the motor to output torque, so that the main cylinder outputs the brake pressure to the wheel cylinder. The electro-hydraulic composite braking system has the advantages of a plurality of drive-by-wire and non-drive-by-wire work modes, and is small in pressure surge and high in pressure regulation accuracy.
Description
Technical field
The utility model belongs to brake system of car technical field, specifically, is a kind of Electro-hydraulic brake system that has electrodynamic braking power-assisted and brake-by-wire function concurrently.
Background technology
As the brake system of automobile core security parts, great transition for several times and improvement have been gone through.From initial leather friction braking, there is finally drum-type, plate disc brake, then occur finally vacuum servo, electric boosted, anti-skid brake system (ABS) and adapt with ABS but higher center valve type brake main cylinder of cost etc.The research and development of line control brake system (Brake-by-wire) have been risen again in recent years, as electro-hydraulic brake (EHB) and electric mechanical braking (EMB).
Hydraulic braking system for automobile adopts vacuum servo mostly at present, and minority automobile adopts the work-saving device of other forms such as electric boosted (as the e-ACT brake system of Nissan Motor).Adopt the automobile of electrodynamic braking power-assisted cannot cut off contacting of drg and manual operation when braking, therefore affected to a certain extent braking energy recovering effect.Yet compare with vacuum servo, the power-assisted size of electric booster braking system is controlled, assist motor can lack power-assisted or non-power-assisted as required to reduce friction braking, during therefore for regenerative brake, can reclaim more multipotency.
The directional balance when effect of line control brake system is not only to have improved traditional automobile brake perfrmance as the constancy of brake efficiency, brake efficiency and braking, especially in order to adapt to the chassis ACTIVE CONTROL of modern automobile and the regenerative brake needs of new-energy automobile.Line control brake system has overcome two obvious deficiencies of traditional energy assisted braking system: the one, can not implement easily initiatively braking (so-called " active is braked ", does not refer in the situation that brake pedal is operated and still can realize the braking to all or part of wheel); The 2nd, as long as chaufeur is stepped on brake pedal, friction brake participates in producing braking force.First deficiency of energy assisted braking system makes it can not meet well the active braking needs that drive anti-skidding control (ASR), electronic stability to control the chassis active control systems such as (ESC) and adaptive cruise control (ACC).Although being housed, ASR and the ESC automobile based on differential pressure braking can implement initiatively braking by the hydraulic control unit of these active control systems, but its pressure is relatively long setting time, therefore and be not suitable for the active boost needs that long time continuous working is difficult to meet ACC dispatch control system because of its electromagnetic valve.Second deficiency of energy assisted braking system seriously hindered the braking energy of the new-energy automobiles such as electronlmobil and hybrid vehicle to reclaim.In addition, adopt brake-by-wire can also obtain better brake pedal feel, avoided traditional energy assisted braking system to regulate caused brake pedal fluctuation because ABS gets involved pressure.Although employing center valve type brake main cylinder can also solve the treadle effort fluctuation problem of traditional energy assisted braking system, increased equally complexity and the cost of brake system.
In the moving system of On-line Control, manpower is trampled brake pedal speed-slackening signal is only provided, and braking energy is supplied with by other energy supply device beyond manpower conventionally.For improving the fail-safe function of line control brake system, its electronic control unit is selfdiagnosis and monitor continuously whole system confidence level states widely.While there is precarious position at system et out of order, system can also automatically provide existing, The cream of the crop function to chaufeur.When et out of order, the failure message of fault memory storage is convenient to diagnosis and maintenance.
At present, the EHB of existing various structures is applied to volume production automobile, as the electro-hydraulic brake of Bosch is controlled (SBC) system, the ECB system of Toyota Motor Corporation and the RBS system of Continental AG etc.EHB generally adopts high pressure fluid reservoir as energy supply device, and its pressure is produced by electric hydraulic pump, can implement if desired initiatively braking.During braking, the braking liquid of high pressure fluid reservoir is imported to master cylinder and promote its piston or directly flow to wheel cylinder, rely on control setup to regulate the brake-pressure of wheel cylinder.Adopt pedal stroke simulator to provide brake pedal feel for chaufeur, and there is the function of manpower backup braking.When EHB thrashing, use standby Manual hydraulic brake system.This type of brake system is because needing high pressure fluid reservoir and extra backup hydraulic efficiency pressure system, and system architecture is not very compact.High pressure fluid reservoir makes brake system can set up very soon brake-pressure, can shorten stopping distance, but in the situation such as bump, may cause high-pressure leakage to threaten occupant safety, has potential safety hazard.In addition, even also need frequent operation for pump and the drive motor thereof of high pressure fluid reservoir when not braking, be affected service life.
EMB system relies on control setup to control driven by motor to slow down to increase and the switching mechanism such as turn round, and directly slipper is pressed against and on brake disc, produces braking force.Because not needing braking liquid and hydraulic tubing, EMB system to there is short, the advantage such as dynamic response is fast drg initial pressure setting time, even surpassed the EHB that relies on Hydraulic Pump output hydraulic pressure power.Each Main Auto parts companies of the whole world such as Germany continent TEVEZ company, Siemens Company and U.S. Delphi company all develop EMB prototype machine separately in succession.This type of brake system needs complicated mechanical switch structure could produce braking force, although fast response time, fail-safe ability is difficult to obtain automaker's trust.After adopting EMB, cannot continue to use traditional drg, need to again develop new-type drg and use performance-oriented power supply, manufacturing cost is higher.Due to these reasons, EMB is not applied so far on volume production automobile.
Except above-mentioned EHB and EMB, adopt motor to drive the electro-hydraulic brake system of brake master cylinder piston to form an other class line control brake system.Publication number is that the patent of invention " a kind of automobile line control brake system " of CN103010199A belongs to this type of.Although all kinds of line control brake systems have plurality of advantages as above, they also come with some shortcomings simultaneously for non-line control system: special inefficacy back-up device need to be set, increase complexity and the cost of system; Under normal operating conditions, treadle effort always relies on simulator generation, and treadle effort is unadjustable; The manpower that puts on brake pedal is not directly used for producing braking force, is unfavorable for shortening the drg onset time.At present also do not find that any brake system can possess the advantage of non-line control brake system and line control brake system simultaneously.
Utility model content
For addressing the above problem, the utility model proposes a kind of Electro-hydraulic brake system with electrodynamic braking power-assisted and brake-by-wire function, can under the various modes such as electrodynamic braking power-assisted, active braking and regenerative brake, work.
The Electro-hydraulic brake system with electrodynamic braking power-assisted and brake-by-wire function, comprises brake pedal, master cylinder, manpower cylinder, pedal stroke simulator, fluid reservoir, 2/2 normally open solenoid valve, 2/2 normally closed solenoid valve, the first check valve, the second check valve, motor, ball screw assembly,, electronic control unit, hydraulic control unit, brake pedal displacement pickup, master cylinder pressure sensor and four wheel cylinders.
Described master cylinder adopts tandem three-chamber master brake cylinder, comprises master cylinder body, first piston, the second piston, first piston push rod, first piston pull back spring, the second piston return spring; Wherein, first piston and the second piston are all positioned at master cylinder body; First piston and the second piston space are as the first high pressure chest; Between the second piston and master cylinder body front end face as the second high pressure chest; Between first piston and master cylinder body aft end face as low-pressure cavity; First piston push rod, through master cylinder body aft end face, is connected with first piston end face; First piston and the second piston space are provided with first piston pull back spring; Between the second piston and master cylinder body front end face, be provided with the second piston return spring; Between first piston push rod and master cylinder body aft end face, be provided with seal ring.On the front end face of first piston, be vertically fixed with bolt, bolt head through after a cover body end face with cover body end face between step coordinate location; Cover body bottom surface coordinates location with the annular protrusion on the second piston rear end face; The length of above-mentioned bolt is greater than the height of cover body; On above-mentioned faceshield side wall, relative position has inlet opening and fluid hole.
Described manpower cylinder comprises manpower cylinder cylinder body, manpower cylinder piston mandril, manpower cylinder piston, manpower cylinder assist spring and manpower cylinder pull back spring; Wherein, manpower cylinder piston is positioned at manpower cylinder cylinder body; Between manpower cylinder piston and manpower cylinder cylinder body front end face, form hydraulic cavities; Manpower cylinder piston mandril is connected through manpower cylinder rear end of the cylinder block face and manpower cylinder piston end surface; Between manpower cylinder piston and manpower cylinder cylinder body front end face, be provided with manpower cylinder pull back spring and manpower cylinder assist spring; Manpower cylinder assist spring is positioned at manpower cylinder pull back spring, and keeps larger axis to gap with manpower cylinder piston.
Described moving pedal simulator comprises simulator cylinder body, emulator piston, simulator pull back spring; Wherein, emulator piston is positioned at simulator cylinder body; Emulator piston carries out axial motion in simulator cylinder body.Conduct simulation chamber between emulator piston and simulator cylinder body front end face, and be axially provided with simulator pull back spring between emulator piston and simulator cylinder body front end face.
Described brake pedal is connected with manpower cylinder piston mandril in manpower cylinder by rest pin; Fluid reservoir is connected with the second high pressure chest with the first high pressure chest of master cylinder respectively; Also be connected with the hydraulic cavities of manpower cylinder simultaneously, and be connected with the low-pressure cavity of master cylinder by the first check valve; The hydraulic cavities of manpower cylinder is communicated with the low-pressure cavity of master cylinder by 2/2 normally open solenoid valve, and also through 2/2 normally closed solenoid valve with in pedal stroke simulator, simulate chamber and be connected; The second check valve is in parallel with 2/2 normally open solenoid valve; The output shaft of motor and the leading screw of ball screw assembly, pass through key connecting; In the nut of ball screw assembly, and master cylinder, first piston push rod is connected; The first high pressure chest and second high pressure chest of master cylinder are communicated with by brake piping with hydraulic control unit respectively; Hydraulic control unit is connected with four wheel cylinders by brake piping; Above-mentioned 2/2 normally open solenoid valve, 2/2 normally closed solenoid valve, motor and hydraulic control unit are all connected with the electronic control unit on vehicle; Meanwhile, electronic control unit is also connected with master cylinder pressure sensor with brake pedal displacement pickup; Brake pedal displacement pickup and master cylinder pressure sensor are arranged on respectively on brake pedal and master cylinder, are used for obtaining the pressure signal of the displacement signal of brake pedal and the first high pressure chest of master cylinder or the second high pressure chest.
Advantage of the present utility model is:
1, the utility model Electro-hydraulic brake system has electrodynamic braking power-assisted and brake-by-wire function simultaneously, and high reliability, the brake pedal feel that has non-line control brake system concurrently can be in harmonious proportion the active braking function of line control brake system;
2, the utility model Electro-hydraulic brake system does not need separately to establish special braking failure back-up device; Under electrodynamic braking assistant mode, if staying out of pressure of wheel braking cylinder, hydraulic control unit regulates, brake pedal feel is identical with traditional non-line control brake system; Under electrodynamic braking assistant mode, even if hydraulic control unit is got involved pressure of wheel braking cylinder and is regulated, also can suppress by Motor torque ACTIVE CONTROL time impact of liquid to master brake cylinder low-pressure cavity of hydraulic control unit, thereby in the situation that do not adopt the center valve type master cylinder that cost is higher to realize good brake pedal feel;
3, in the utility model Electro-hydraulic brake system, master cylinder adopts and utilizes the existing structure of tandem tandem master cylinder and manufacturing process, and Electro-hydraulic brake system can be continued to use traditional drg, can utilize assist motor to implement initiatively braking simultaneously, need not adopt the hydraulic control unit with part or all of wheel active boost function, reduce manufacturing cost;
4, the utility model Electro-hydraulic brake system, because motor participates in adjustable brake pressure, makes that whole system fluctuation of pressure is little, pressure regulation precision is high.
Accompanying drawing explanation
Fig. 1 is the utility model Electro-hydraulic brake system architecture schematic diagram.
In figure:
1-brake pedal 2-master cylinder 3-manpower cylinder
4-pedal stroke simulator 5-fluid reservoir 6-2/2 normally open solenoid valve
7-2/2 normally closed solenoid valve 8-first check valve 9-the second check valve
10-motor 11-ball screw assembly, 12-electronic control unit
13-hydraulic control unit 14-brake pedal displacement pickup 15-master cylinder pressure sensor
16-wheel cylinder 201-master cylinder body 202-first piston
203-the second piston 204-first piston push rod 205-first piston pull back spring
206-the second piston return spring 207-seal ring 208-bolt
209-cover body 301-manpower cylinder cylinder body 302-manpower cylinder piston mandril
303-manpower cylinder piston 304-manpower cylinder assist spring 305-manpower cylinder pull back spring
401-simulator cylinder body 402-emulator piston 403-simulator pull back spring
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
The utlity model has the Electro-hydraulic brake system of electrodynamic braking power-assisted and brake-by-wire function, comprise brake pedal 1, master cylinder 2, manpower cylinder 3, pedal stroke simulator 4, fluid reservoir 5,2/2 normally open solenoid valve 6,2/2 normally closed solenoid valve 7, the first check valve 8, the second check valve 9, motor 10, ball screw assembly, 11, electronic control unit (ECU) 12, hydraulic control unit 13, brake pedal displacement pickup 14, master cylinder pressure sensor 15 and four wheel cylinders 16, as shown in Figure 1.
Described master cylinder 2 adopts tandem three-chamber master brake cylinder, comprises master cylinder body 201, first piston 202, the second piston 203, first piston push rod 204, first piston pull back spring 205, the second piston return spring 206.Wherein, first piston 202 and the second piston 203 are all positioned at master cylinder body 201; 203, first piston 202 and the second piston are as the first high pressure chest; Between the second piston 203 and master cylinder body 201 front end faces as the second high pressure chest; Between first piston 202 and master cylinder body 201 aft end faces as low-pressure cavity.First piston push rod 204, through master cylinder body 201 aft end faces, is connected with first piston 202 end faces, by push-and-pull first piston push rod 204, can realize first piston 202 along master cylinder body 201 axle upward movements.Between first piston push rod 204 and master cylinder body 201 aft end faces, be provided with seal ring 207, by seal ring 207, realize the sealing of master cylinder body 201. First piston 202 and 203, the second piston are coaxially arranged with first piston pull back spring 205, and first piston pull back spring 205 two ends contact with first piston 202, the second piston 203 respectively; Between the second piston 203 and master cylinder body 201 front end faces, be coaxially arranged with the second piston return spring 206; The second piston return spring 206 two ends contact with master cylinder body 201, the second piston 203 respectively.On the front end face of first piston 202, be vertically fixed with bolt 208, bolt 208 heads through after cover body 209 end faces with cover body 209 end faces between step coordinates location, realize spacing on bolt 208 is axial of cover body 209.Cover body 209 bottom surfaces coordinate location with the annular protrusion on the second piston 203 aft end faces.The length of above-mentioned bolt 208 is greater than the height of cover body 209, thus when the first high pressure chest inside is full of braking liquid, the motion that promotes first piston 208 can drive the second piston 203 motions, and now the relative position of 203, the bolt 208 on first piston 202 and cover body 209 and the second piston is constant; And when the inner braking liquid of the first high pressure chest is when not enough (occurring leakage situation), promote the motion of first piston 202, after can making bolt 207 on first piston 202 move to contact with the second piston 203 aft end faces, continue motion, and then promote the second piston 203 motions.On above-mentioned cover body 208 sidewalls, relative position has inlet opening and fluid hole, prevents that braking liquid is trapped in cover body 209, affects bolt 208 motions.
Described manpower cylinder 3 comprises manpower cylinder cylinder body 301, manpower cylinder piston mandril 302, manpower cylinder piston 303, manpower cylinder assist spring 304 and manpower cylinder pull back spring 305; Wherein, manpower cylinder piston 303 is positioned at manpower cylinder cylinder body 301; Between manpower cylinder piston 303 and manpower cylinder cylinder body 301 front end faces, form hydraulic cavities; Manpower cylinder piston mandril 302 is connected through manpower cylinder cylinder body 301 aft end faces and manpower cylinder piston 303 end faces; By push-and-pull manpower cylinder piston mandril 302, can realize manpower cylinder piston 303 along the axial motion of manpower cylinder cylinder body 301.Between manpower cylinder piston 303 and manpower cylinder cylinder body 301 front end faces, be coaxially arranged with manpower cylinder pull back spring 305 and manpower cylinder assist spring 304; Manpower cylinder assist spring 304 is positioned at manpower cylinder pull back spring 305; The two ends of manpower cylinder pull back spring 305 contact with manpower cylinder cylinder body 301, manpower cylinder piston 303 respectively; The length of manpower cylinder assist spring 304 is less than manpower cylinder pull back spring 305, and near the 301 front end face settings of manpower cylinder cylinder body, one end contacts with manpower cylinder cylinder body 301 front end faces, and the other end and manpower cylinder piston 303 keep larger axis to gap.。
Described pedal stroke simulator 4 comprises simulator cylinder body 401, emulator piston 402, simulator pull back spring 403; Wherein, emulator piston 402 is positioned at simulator cylinder body 401; Emulator piston 402 can be along simulator cylinder body 401 axial motions.Conduct simulation chamber between emulator piston 402 and simulator cylinder body 401 front end faces, and be axially provided with simulator rebound spring 403 between emulator piston 402 and simulator cylinder body 401 front end faces.
Described brake pedal 1 is connected with manpower cylinder piston mandril 302 in manpower cylinder 3 by rest pin; Fluid reservoir 5 is connected with the second high pressure chest with the first high pressure chest of master cylinder 2 respectively; Also be connected with the hydraulic cavities of manpower cylinder 3 simultaneously, and be connected with the low-pressure cavity of master cylinder 2 by the first check valve 8, by fluid reservoir 5, in the first high pressure chest of master cylinder 2 and the hydraulic cavities of the second high pressure chest and manpower cylinder 3, provide braking required braking liquid.The hydraulic cavities of manpower cylinder 3 is communicated with the low-pressure cavity of master cylinder 2 by 2/2 normally open solenoid valve 6, and also through 2/2 normally closed solenoid valve 7 with in pedal stroke simulator 4, simulate chamber and be connected.The second check valve 9 is in parallel with 2/2 normally open solenoid valve 6.The leading screw of the output shaft of motor 10 and ball screw assembly, 11 passes through key connecting; In the nut of ball screw assembly, 11 and master cylinder 2, first piston push rod 204 is connected, and then is connected with first piston 202.The first high pressure chest of master cylinder 2 and the second high pressure chest are communicated with by brake piping with hydraulic control unit 13 respectively; Hydraulic control unit 13 is connected with four wheel cylinders 16 by brake piping, to brake-pressure is delivered to, four wheel cylinders 16 are implemented braking and brake-pressure regulates.Above-mentioned 2/2 normally open solenoid valve 6,2/2 normally closed solenoid valve 7, motor 10 are all connected with the electronic control unit 12 on vehicle with hydraulic control unit 13; Meanwhile, electronic control unit, except the vehicle-mounted control sensor with on existing vehicle (as wheel speed sensors, pressure of wheel braking cylinder sensor) is connected, is also connected with master cylinder pressure sensor 15 with the brake pedal displacement pickup 14 increasing in the utility model; Brake pedal displacement pickup 14 is arranged on respectively on brake pedal 1 and master cylinder 2 with master cylinder pressure sensor 15, is used for obtaining the pressure signal of the displacement signal of brake pedal 1 and the first high pressure chest of master cylinder 2 and the second high pressure chest.Thus, the collection signal of the vehicle-mounted control sensor receiving by electronic control unit basis and brake pedal displacement pickup 14, master cylinder pressure sensor 15,2/2 normally open solenoid valve 6,2/2 normally closed solenoid valve 7, motor 10 and hydraulic control unit 13 are controlled, realize the selection of Electro-hydraulic brake Braking system pattern, comprise the parallel schema that electrodynamic braking assistant mode, regenerative brake pattern, friction braking and regenerative brake are worked simultaneously, and the active braking mode when brake pedal 1 is not operated but has braking requirement, be specially:
The normal mode of operation of Electro-hydraulic brake system all adopts electrodynamic braking assistant mode.For not thering is the automobile of regeneration brake system with active brake system, brake pedal 1 displacement signal that electronic control unit 12 only gathers according to brake pedal displacement pickup 14, brake pedal 1 is trampled to state to be detected, when brake pedal 1 being detected and be operated, electronic control unit 12 is selected electrodynamic braking assistant modes; Now, brake pedal 1 promotes 303 motions of manpower cylinder piston, and the hydraulic cavities inside brake liquid of manpower cylinder 3 is delivered in the low-pressure cavity of master cylinder 2 through 2/2 normally open solenoid valve 6, and then promotes first piston 202 motions; Simultaneously, brake pedal 1 displacement signal that electronic control unit 12 also gathers according to brake pedal displacement pickup 14, according to assist characteristic curve, draw the power torque of motor 10, thus, make the output torque of motor 10 and apply power-assisted through ball screw assembly, 11 to promote first piston 202 motions.Under the pressure of brake pedal 1 and the propulsive effort combined action of motor 10, in the first high pressure chest of master cylinder 2 and the second high pressure chest, set up brake-pressure, make the braking liquid in the second high pressure chest export four wheel cylinders 16 to through hydraulic control unit 13.In continuing braking procedure, if when electronic control unit 12 is detected any wheel and had locking trend by the abs sensor in vehicle-mounted control sensor, Electro-hydraulic brake system enters ABS state under the control of electronic control unit 12.Different from existing hydraulic brake system ABS, four wheel cylinder 16 pressures not only can regulate by hydraulic control system 13, and can regulate by the torque output of electronic control unit 12 adjustment motors 10; Thus, the assist characteristic curve that makes motor 10 adapts with the coefficient of road adhesion identifying, and low, adheres under operating mode electric boosted smallerly, at height, adheres under operating mode electric boosted larger.Be not both with another point of existing hydraulic brake system ABS, the pressure signal signal that electronic control unit 12 can gather according to master cylinder pressure sensor 15, control additional torque of motor 10 outputs and suppress time compression shock of liquid to the low-pressure cavity of master cylinder 2 of hydraulic control unit 13, thereby realize good brake pedal 1 sensation.In any stage of whole process, once negative pressure appears in the low-pressure cavity of master cylinder 2, the low-pressure cavity that braking liquid just can enter into master cylinder 2 through the first check valve 8 from fluid reservoir 5 is carried out fluid infusion.For discharging fast wheel cylinder 16 pressure in the braking releasing stage, can make motor 10 reversions by electronic control unit 12, now in the low-pressure cavity of master cylinder 2, unnecessary braking liquid can be in second check valve 9 Rapid Flow the Huis power cylinders 3, and finally enter fluid reservoir 5.
For the automobile that regeneration brake system is housed, when electronic control unit 12 detects brake pedal 1 and is operated, further by electrical quantity sensor, the closed-center system of energy source of car system (as battery) is detected, when closed-center system allows energy storage (i.e. charging concerning battery), and the braking deceleration that only relies on regenerative brake to produce is enough to produce in the situation of desired braking deceleration, electronic control unit 12 is selected regenerative brake pattern, and friction braking is not worked; Now, 2/2 normally open solenoid valve 6 energisings are closed, 2/2 normally closed solenoid valve 7 energisings are opened, by brake pedal 1, drive 303 motions of manpower cylinder piston, make braking liquid in the hydraulic cavities of manpower cylinder 3 in 2/2 normally closed solenoid valve 7 enters into the simulation chamber of pedal stroke simulator 4, and then promote emulator piston 402 and move axially and compress simulator pull back spring 403, rely on simulator pull back spring 403 that brake pedal feel is provided, provide brake pedal 1 sensation, realize the desired friction braking of regenerative brake and do not participate in braking.The parallel schema that electronic control unit also can select friction braking and regenerative brake to work simultaneously if desired,, when carrying out regenerative brake, electronic control unit 12 is controlled motor output torque, makes master cylinder 2 delivery pressures auxiliary with friction braking to wheel cylinder 16.When the closed-center system of energy source of car system does not allow energy storage, electronic control unit 12 is still selected electrodynamic braking assistant mode.
For the initiatively automobile of brake system is housed, if detecting vehicle, electronic control unit 12 has electronic control unit 12 selection active braking modes of active braking requirement, as: it is excessively near that electronic control unit 12 detects vehicle distances obstacle by wheel speed sensors and distance measuring sensor, and lasting current vehicle speed is travelled in the time of can bumping, electronic control unit 12 is selected initiatively braking mode; Now, electronic control unit 12 is controlled the first high pressure chest and the interior build-up pressure of the second high pressure chest that motor 10 output torques make master cylinder 2, and by hydraulic control unit 13, select whole wheels or part wheel to implement braking, and adjust where necessary each wheel cylinder 16 brake-pressures.Because brake pedal 1 under this pattern is not operated, when motor 10 drives first piston 202 motion, the low-pressure cavity volume of master cylinder 2 is increased, the inner vacuum that forms, therefore by the first check valve 8, to the low-pressure cavity of master cylinder 2, carry out fluid infusion, so brake pedal 1 can be because initiatively not braking and produce unnecessary motion.
When the electronic control unit 12 in Electro-hydraulic brake system, hydraulic control unit 13 or vehicle-mounted control sensor and brake pedal displacement pickup 14, master cylinder pressure sensor 15 et out of order, can provide existing, The cream of the crop braking function from trend chaufeur; As: if hydraulic control unit 13 et out of orders, now hydraulic control unit 13 carries out pressure controlled afunction, but still can bring into play electrodynamic braking power-assisted, brake-by-wire and active braking function.If manpower cylinder 3 or the brake piping being communicated with manpower cylinder 3 leak, still can and drive first piston 202 exercises initiatively to brake and brake-by-wire by motor 10.In above-mentioned situation, brake pedal 1 sensation is produced by manpower cylinder assist spring 304, but brake pedal 1 stroke ratio is slightly large while leaking.Under extreme case, when whole Electro-hydraulic brake system power supply lost efficacy, the unlatching under each electromagnetic valve off-position is with closed, and chaufeur is stepped on brake pedal 1 and still can be produced brake-pressures by manpower cylinder 3, and through brake piping, be delivered to the low-pressure cavity of master cylinder 2, thereby implement manual braking.
Claims (2)
1. the Electro-hydraulic brake system with electrodynamic braking power-assisted and brake-by-wire function, comprise brake pedal, electronic control unit, hydraulic control unit and four wheel cylinders, it is characterized in that: also comprise master cylinder, manpower cylinder, pedal stroke simulator, fluid reservoir, 2/2 normally open solenoid valve, 2/2 normally closed solenoid valve, the first check valve, the second check valve, motor, ball screw assembly,, brake pedal displacement pickup, master cylinder pressure sensor;
Described master cylinder comprises master cylinder body, first piston, the second piston, first piston push rod, first piston pull back spring, the second piston return spring; Wherein, first piston and the second piston are all positioned at master cylinder body; First piston and the second piston space are as the first high pressure chest; Between the second piston and master cylinder body front end face as the second high pressure chest; Between first piston and master cylinder body aft end face as low-pressure cavity; First piston push rod, through master cylinder body aft end face, is connected with first piston end face; First piston and the second piston space are provided with first piston pull back spring; Between the second piston and master cylinder body front end face, be provided with the second piston return spring; Between first piston push rod and master cylinder body aft end face, be provided with seal ring; On the front end face of first piston, be vertically fixed with bolt, bolt head through after a cover body end face with cover body end face between step coordinate location; Cover body bottom surface coordinates location with the annular protrusion on the second piston rear end face; The length of above-mentioned bolt is greater than the height of cover body; On above-mentioned faceshield side wall, relative position has inlet opening and fluid hole;
Described manpower cylinder comprises manpower cylinder cylinder body, manpower cylinder piston mandril, manpower cylinder piston, manpower cylinder assist spring and manpower cylinder pull back spring; Wherein, manpower cylinder piston is positioned at manpower cylinder cylinder body; Between manpower cylinder piston and manpower cylinder cylinder body front end face, form hydraulic cavities; Manpower cylinder piston mandril is connected through manpower cylinder rear end of the cylinder block face and manpower cylinder piston end surface; Between manpower cylinder piston and manpower cylinder cylinder body front end face, be provided with manpower cylinder pull back spring and manpower cylinder assist spring; Manpower cylinder assist spring is positioned at manpower cylinder pull back spring;
Described pedal stroke simulator comprises simulator cylinder body, emulator piston, simulator pull back spring; Wherein, emulator piston is positioned at simulator cylinder body; Conduct simulation chamber between emulator piston and simulator cylinder body front end face, and the coaxial simulator pull back spring that is provided with between emulator piston and simulator cylinder body front end face;
Described brake pedal is connected with manpower cylinder piston mandril in manpower cylinder by rest pin; Fluid reservoir is connected with the second high pressure chest with the first high pressure chest of master cylinder respectively; Also be connected with the hydraulic cavities of manpower cylinder simultaneously, and be connected with the low-pressure cavity of master cylinder by the first check valve; The hydraulic cavities of manpower cylinder is communicated with the low-pressure cavity of master cylinder by 2/2 normally open solenoid valve, and also through 2/2 normally closed solenoid valve with in pedal stroke simulator, simulate chamber and be connected; The second check valve is in parallel with 2/2 normally open solenoid valve; The output shaft of motor and the leading screw of ball screw assembly, pass through key connecting; In the nut of ball screw assembly, and master cylinder, first piston push rod is connected; The first high pressure chest and second high pressure chest of master cylinder are communicated with by brake piping with hydraulic control unit respectively; Hydraulic control unit is connected with four wheel cylinders by brake piping; Above-mentioned 2/2 normally open solenoid valve, 2/2 normally closed solenoid valve, motor and hydraulic control unit are all connected with the electronic control unit on vehicle; Meanwhile, electronic control unit is also connected with master cylinder pressure sensor with brake pedal displacement pickup; Brake pedal displacement pickup and master cylinder pressure sensor are arranged on respectively on brake pedal and master cylinder, are used for obtaining the pressure signal of the displacement signal of brake pedal and the first high pressure chest of master cylinder or the second high pressure chest.
2. the Electro-hydraulic brake system as claimed in claim 1 with electrodynamic braking power-assisted and brake-by-wire function, it is characterized in that: the length of described manpower cylinder assist spring is less than manpower cylinder pull back spring, near manpower cylinder cylinder body front end face, arrange, and there is endplay with manpower cylinder piston space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320726268.4U CN203511632U (en) | 2013-11-18 | 2013-11-18 | Electro-hydraulic composite braking system with electric brake booster and drive-by-wire brake function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320726268.4U CN203511632U (en) | 2013-11-18 | 2013-11-18 | Electro-hydraulic composite braking system with electric brake booster and drive-by-wire brake function |
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| CN203511632U true CN203511632U (en) | 2014-04-02 |
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| CN201320726268.4U Expired - Fee Related CN203511632U (en) | 2013-11-18 | 2013-11-18 | Electro-hydraulic composite braking system with electric brake booster and drive-by-wire brake function |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104149765A (en) * | 2014-08-19 | 2014-11-19 | 清华大学 | Car electronic and hydraulic brake system capable of realizing time-sharing control |
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| CN104149765B (en) * | 2014-08-19 | 2017-01-25 | 清华大学 | Car electronic and hydraulic brake system capable of realizing time-sharing control |
| CN104149765A (en) * | 2014-08-19 | 2014-11-19 | 清华大学 | Car electronic and hydraulic brake system capable of realizing time-sharing control |
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| CN109955841A (en) * | 2019-04-22 | 2019-07-02 | 南京经纬达汽车科技有限公司 | It is a kind of with failure manpower backup functionality from primary brake system and its braking method |
| CN109955840A (en) * | 2019-04-22 | 2019-07-02 | 南京经纬达汽车科技有限公司 | Timesharing with failure manpower backup functionality is from primary brake system and braking method |
| CN112896125B (en) * | 2021-03-05 | 2021-11-26 | 南京经纬达汽车科技有限公司 | Split type electro-hydraulic braking system and braking control method thereof |
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| CN115384468A (en) * | 2022-09-05 | 2022-11-25 | 浙江极氪智能科技有限公司 | Braking system and vehicle |
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