CN101152864B - Braking system of electric car - Google Patents
Braking system of electric car Download PDFInfo
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- CN101152864B CN101152864B CN200610140135A CN200610140135A CN101152864B CN 101152864 B CN101152864 B CN 101152864B CN 200610140135 A CN200610140135 A CN 200610140135A CN 200610140135 A CN200610140135 A CN 200610140135A CN 101152864 B CN101152864 B CN 101152864B
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Abstract
The present invention provides an electric vehicle braking system which comprises a brake pedal, a brake master cylinder which is connected with the brake pedal and a wheel braking cylinder which is hydraulically driven by the brake master cylinder. The braking system also comprises a normally open solenoid valve, a pedal checkout gear, an electronic control unit and a hydraulic brake device. The normally open solenoid valve is arranged on a hydraulic pipeline which is arranged between the brake master cylinder and the wheel braking cylinder. The hydraulic brake device is hydraulically driven by the wheel braking cylinder. The pedal checkout gear induces the locomotion of the brake pedal, transforms the locomotion to electrical signal and sends the electrical signal to the electronic control unit. The electronic control unit incepts the electrical signal, controls the normally open solenoid valve to close and at the same time controls the hydraulic brake device to drive the wheel braking cylinder acting. Using the braking system not only abrogates the use of a brake booster but also significantly increases the braking reliability and the traffic safety because two independent braking systems exist.
Description
Technical field
The present invention relates to a kind of brake system of automobile, relate in particular to a kind of braking system of electric car.
Background technology
In the brake system of automobile, to use brake servo unit usually, for example vacuum booster or hydraulic booster.Because brake servo unit is bulky, therefore the layout of complete vehicle structure can be subject to many limitations in use.In addition, on electronlmobil, use vacuum booster, make degree of vacuum too little owing to lacking the engine negative pressure effect, thus the power-assisted DeGrain.
In order to address the above problem, CN 1706701A provides a kind of braking system of electric car, this brake system is except comprising brake pedal, master brake cylinder, outside the conventional hydraulic braking parts such as brake wheel cylinder and underground, also comprise and be used for that the inductive brake pedal position moves and this position moved the braking intention sensor that is converted into electric signal, be used to receive from the electric signal of this braking intention sensor and send the electronic control unit (electronic control unit) of action command, be used to receive the action command of electronic control unit and produce the actr of action, and described actr links to each other with described master brake cylinder by driving device, be used to drive master brake cylinder, thereby produce brake boost.
In this braking system of electric car, by using braking intention sensor, electronic control unit, actr and driving device to produce brake boost, can cancel bulky vacuum booster, therefore on braking system of electric car, allow the brake pedal and the annexation of master brake cylinder realize that changing linearity into by mechanical connection is connected (cable connection mode), optimizes the effect that complete vehicle structure is arranged thereby can reach.
But, in this braking system of electric car, owing to only there is a cover brake system, though can cancel vacuum booster, realize the effect of complete vehicle structure preferred arrangement, but the service brake safety of automobile does not improve, if promptly brake system breaks down, the danger that vehicle can't normal brake application then can occur.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of braking system of electric car that can optimize the complete vehicle structure layout and can significantly improve the electronlmobil braking safety.
This braking system of electric car comprises brake pedal, with brake pedal bonded assembly master brake cylinder and with the brake wheel cylinder of master brake cylinder fluid pressure linkage, this brake system also comprises normally open solenoid valve, the pedal detecting device, electronic control unit and hydraulic brake system, wherein said normally open solenoid valve is on the hydraulic tubing that is connected between master brake cylinder and the brake wheel cylinder, described hydraulic brake system and described brake wheel cylinder fluid pressure linkage, the position of described pedal detecting device inductive brake pedal is moved and this position is moved and is converted into electric signal and sends to electronic control unit, described electronic control unit receives this electric signal, and the control normally open solenoid valve cuts out and while modulated pressure brake equipment drives described brake wheel cylinder action; Described hydraulic brake system comprises by motor-driven Hydraulic Pump, this Hydraulic Pump and described brake wheel cylinder fluid pressure linkage, the described motor action of electronic control unit controls, wherein, described brake system also comprises the brake fluid pressure sensor, and this brake fluid pressure sensor is on the hydraulic tubing that is connected between Hydraulic Pump and the brake wheel cylinder; When the hydraulic pressure in the hydraulic tubing of described brake fluid pressure sensor between Hydraulic Pump and brake wheel cylinder was lower than rated value, described electronic control unit received this electric signal and controls described normally open solenoid valve and open; When described normally open solenoid valve was opened, the high hydraulic brake fluid of described master brake cylinder flowed into described master brake cylinder to realize braking by described normally open solenoid valve.
Adopt system provided by the invention, when chaufeur is trampled brake pedal, the pedal detecting device is sensed the position of brake pedal and is moved, and this position moved be converted into electric signal and send to electronic control unit, this electronic control unit receives electric signal control normally open solenoid valve and closes, modulated pressure brake equipment hydraulic-driven brake wheel cylinder action simultaneously, thus realize the service brake of automobile or the braking mode of releasing automobile.By this brake system, can cancel the use of brake servo unit.In addition, when this cover brake system breaks down, normally open solenoid valve can not cut out owing to the trample action of brake pedal, thereby in the time of can't normal operation, hydraulic brake system for example, when itself there are fault in pedal detecting device or electronic control unit, electronic control unit all can cut off electronic control unit power supply and/or whole brake system electric power supply power supply automatically, thereby normally open solenoid valve is in open mode owing to power supply disconnects, then still can pass through brake pedal then, master brake cylinder, the traditional hydraulic brake system of this cover of normally open solenoid valve and brake wheel cylinder carries out brake operating, thereby has improved traveling security greatly.
Description of drawings
Fig. 1 is the block scheme of an embodiment of the present invention.
Fig. 2 is the operational flowchart of embodiment among Fig. 1.
Fig. 3 is the block scheme of the another kind of embodiment of the present invention.
Fig. 4 is the operational flowchart of embodiment among Fig. 3.
Fig. 5 is the structural representation of exemplary embodiment of the present invention.
Fig. 6 is the operational flowchart of embodiment among Fig. 5.
Description of reference numerals
1 brake pedal, 31 motors
2 master brake cylinders, 32 Hydraulic Pumps
3 open electromagnetic valves, 33 brake fluid pressure sensors
4 brake wheel cylinders, 34 fluid reservoirs
10 pedal detecting devices, 35 normally closed solenoid valves
11 contact switchs, 36 supply units
12 braking simulators
13 hydraulic pressure transducers
14 master cylinder hydraulic pressure simulators
20 electronic control units
30 hydraulic brake systems
The specific embodiment
Braking system of electric car provided by the invention comprises brake pedal 1, with brake pedal 1 bonded assembly master brake cylinder 2 and with the brake wheel cylinder 4 of master brake cylinder 2 fluid pressure linkages, this brake system also comprises normally open solenoid valve 3, pedal detecting device 10, electronic control unit 20 and hydraulic brake system 30, wherein said normally open solenoid valve 3 is on the hydraulic tubing that is connected between master brake cylinder 2 and the brake wheel cylinder 4, described hydraulic brake system 30 and described brake wheel cylinder 4 fluid pressure linkages, the position of described pedal detecting device 10 sensing brake pedals 1 is moved and this position is moved and is converted into the electric signal that moves of expression position and sends to electronic control unit 20, described electronic control unit 20 receives this electric signal, and control normally open solenoid valve 3 closed also while modulated pressure brake equipments 30 drive described brake wheel cylinder 4 actions.
Fig. 1 is the block scheme of a kind of specific embodiment of the present invention, and Fig. 2 is the operational flowchart of embodiment among Fig. 1.
As shown in Figure 1, braking system of electric car of the present invention also has the energy assisted braking system of the electronic control of a cover in addition except having a traditional cover hydraulic brake system.
Shown in the left side of Fig. 1, traditional hydraulic brake system comprises brake pedal 1, master brake cylinder 2 and brake wheel cylinder 3.By trampling brake pedal 1, the braking liquid in the master brake cylinder 2 is delivered to brake wheel cylinder 3 by hydraulic tubing, thereby realizes vehicle braked.When brake pedal 1 unclamped, the braking liquid in the brake wheel cylinder 3 then was back in the master brake cylinder 1, thus the braking mode of freeing vehicle.This traditional hydraulic brake system of cover is owing to lack brake servo unit, thus only break down and can't just can use during normal operation usually at another set of energy assisted braking system of the present invention, so that in case of emergency guarantee the brake safe of driving.
Shown in the right of Fig. 1, brake system of the present invention also comprises the energy assisted braking system of the electronic control of a cover, this system comprises brake pedal 1, pedal detecting device 10, electronic control unit 20, hydraulic brake system 30, brake wheel cylinder 4, also has the normally open solenoid valve 3 that is electrically connected with electronic control unit 20 between master brake cylinder 2 and brake wheel cylinder 4 in addition.Normally open solenoid valve 3 is when representing under normal circumstances not have brake operating or is to be in open mode when not having energized.The purpose that normally open solenoid valve 3 is set is in order to switch when needed between the energy assisted braking system of traditional hydraulic brake system and electronic control, promptly can select work between they the two.
Pedal detecting device 10 is used to detect the braking of chaufeur and remove the operation of braking, and this information is delivered to electronic control unit 20, carries out corresponding operation by electronic control unit 20 then.Pedal detecting device 10 can be directly move by the position of detecting brake pedal 1 finishes aforesaid operations, also can move and the output hydraulic pressure of master brake cylinder 2 is finished aforesaid operations by the position of detecting brake pedal 1 simultaneously.
When brake pedal 1 is operated, the electric signal that the expression brake pedal 1 that pedal detecting device 10 will sense is operated sends to electronic control unit 20, electronic control unit 20 receives this electric signal, control normally open solenoid valve 3 cuts out, and modulated pressure brake equipment 30 drives described brake wheel cylinder 4 brakings simultaneously; When brake pedal 1 is released, the expression brake pedal 1 released electric signal that pedal detecting device 10 will sense sends to electronic control unit 20, electronic control unit 20 receives this electric signal, and modulated pressure brake equipment 30 drives described brake wheel cylinder 4 brake offs.
Adopt system provided by the invention, when the circuit of automobile breaks down, the energy assisted braking system power supply of electronic control is cut off or during the detector et out of order, electronic control unit 20 cisco unity malfunctions, at this moment, electronic control unit 20 can not be controlled normally open solenoid valve 3 and close, when brake pedal 1 was operated, because normally open solenoid valve 3 is in open mode, hydraulic brake system was started working, braking force then by the hydraulic pressure of master brake cylinder 2 outputs, is braked brake wheel cylinder 4.
Described pedal detecting device 10 can be contact switch or pedal sensor.When described pedal detecting device 10 is contact switch, this contact switch can move and sends control commands corresponding by electronic control unit 20 by the position of sensing brake pedal 1, comprise that controlling normally open solenoid valve 3 closes, 30 brakings of modulated pressure brake equipment, and modulated pressure brake equipment 30 brake offs.
Pedal sensor can use the various right sensors in this area, for example can use the displacement pickup that is used for sensing brake pedal 1 moving displacement that uses among the CN1706701A, or be used for the angular transducer that sensing brake pedal 1 turns over angle around the shaft, or be used for the stressed hydraulic pressure transducer of sensing brake pedal 1 downside support zone, the perhaps sensor of other type.These sensors can send to the information of brake pedal 1 motion electronic control unit 20 and close with control normally open solenoid valve 3, and come 2 brakings of control brake wheel cylinder by electronic control unit 20 modulated pressure brake equipments 30 simultaneously.That is, the function of pedal sensor had both comprised control normally open solenoid valve 3 closures, also comprised 4 brakings of control brake wheel cylinder.
In addition, these sensors also can be used in combination with the contact switch 11 on the brake pedal 1, wherein the former (pedal sensor) can come 2 brakings of control brake wheel cylinder by electronic control unit 20 modulated pressure brake equipments 30, and latter's (contact switch 11) passes through electronic control unit 20 control normally open solenoid valves 3 closures by trampling of sensing brake pedal 1.In other words, the function of contact switch 11 is control normally open solenoid valve 3 closures, and the function of pedal sensor then is 4 brakings of control brake wheel cylinder.
Described brake pedal 1 trample stroke preferably and be linear relationship between the electric signal that arrives of the sensor of these types, the braking force that electronic control unit 20 modulated pressure brake equipments 30 are produced is directly proportional with the stroke of trampling of brake pedal 1.That is to say that the stroke of brake pedal 1 is big more, the braking force that described hydraulic brake system 30 produces is big more, and the vehicle braked time is then short more.
According to one embodiment of the present invention, pedal detecting device 10 can be can sensing brake pedal 1 the position move the pedal detecting device of the stroke that moves with brake pedal 1 position, or the combination of the pedal detecting device of the pedal detecting device that moves of position that can sensing brake pedal 1 and the stroke that can sensing brake pedal 1 position moves; Pedal detecting device 10 is gone back the stroke that move sensing brake pedal 1 position, and the electric signal that will represent the stroke that move brake pedal 1 position sends to electronic control unit 20, the electric signal of the stroke that electronic control unit 20 moves according to expression brake pedal 1 position that pedal detecting device 10 senses, modulated pressure brake equipment 30 drives the dynamics of described brake wheel cylinder 4.
Preferably, the electric signal of the stroke that move expression brake pedal 1 position that pedal detecting device 10 sends represents that the stroke that moves brake pedal 1 position is big more, and the dynamics that modulated pressure brake equipment 30 drives described brake wheel cylinder 4 is big more.
Preferably, pedal detecting device 10 comprises contact switch 11 and the pedal sensor that is installed on the brake pedal 1, the position that described contact switch 11 detects brake pedals 1 is moved and this position is moved and is converted to electric signal and sends to electronic control unit 20, and described electronic control unit 20 receives these electric signal and also controls normally open solenoid valve 3 and close; Simultaneously, also this shift motion is converted to electric signal sends to electronic control unit 20 to the shift motion of described pedal sensor inductive brake pedal 1, described electronic control unit 20 receives this electric signal, according to the size of the shift motion of the brake pedal 1 that senses, modulated pressure brake equipment 30 drives the dynamics of described brake wheel cylinder 4.
Preferably, described pedal sensor is the displacement pickup that is used for sensing brake pedal 1 moving displacement, or be used for the angular transducer that sensing brake pedal 1 turns over angle around the shaft, or be used for the stressed hydraulic pressure transducer of sensing brake pedal 1 downside support zone.
Below with reference to Fig. 2 the operating process of a kind of embodiment of the present invention is described in detail.
As shown in Figure 2, when brake pedal 1 action,, and should move electric signal and sent to electronic control unit 20 at first by the action of pedal detecting device 10 sensing brake pedals 1.When the action of brake pedal 1 was trampled, pedal detecting device 10 sent to electronic control unit 20 with the electric signal of trampling of brake pedal 1 immediately.Then, electronic control unit 20 is at first controlled normally open solenoid valve 3 and is closed, thereby cuts off the hydraulic path between master brake cylinder 2 and the brake wheel cylinder 4, the i.e. hydraulic brake system on fragmentary 1 left side.Then, the pedal that electronic control unit 20 sends according to pedal detecting device 10 is trampled electric signal and is come modulated pressure brake equipment 30, drive brake wheel cylinder 4 actions by hydraulic brake system 30, this process is carried out in circulation then, until final realization vehicle braked operation.
When if the action of brake pedal 1 is released, it unclamps action the 10 same detections of pedal detecting device, then this action is converted into electric signal and sends to electronic control unit 20, then by the brake operating of electronic control unit 20 modulated pressure brake equipments 30 brake off wheel cylinders 4, this process is carried out in circulation then, but until making vehicle return to motoring condition at last.
Fig. 3 is that the embodiment with the output hydraulic pressure of master brake cylinder 2 is moved in position that expression pedal detecting device 10 detects brake pedal 1 simultaneously, and Fig. 4 is the workflow diagram of this embodiment.
As shown in Figure 3, pedal detecting device 10 can comprise the contact switch 11 that is installed on the brake pedal 1 and with the master cylinder hydraulic pressure simulator 14 of master brake cylinder 2 hydraulic communication, the position that described contact switch 11 detects brake pedals 1 is moved and this position is moved and is converted to electric signal and sends to electronic control unit 20, and described electronic control unit 20 receives these electric signal and also controls normally open solenoid valve 3 and close; Simultaneously, the output hydraulic pressure of described master cylinder hydraulic pressure simulator 14 inductive brake master cylinders 2 also should be exported hydraulic pressure and is converted to electric signal and sends to electronic control unit 20, described electronic control unit 20 receives this electric signal, according to the size of the output hydraulic pressure of the master brake cylinder 2 that senses, modulated pressure brake equipment 30 drives the dynamics of described brake wheel cylinder 4.
Preferably, the output hydraulic pressure of the master brake cylinder 2 that master cylinder hydraulic pressure simulator 14 senses is big more, and the dynamics that modulated pressure brake equipment 30 drives described brake wheel cylinder 4 is big more.
Preferably, described master cylinder hydraulic pressure simulator 14 comprises braking simulator 12 and hydraulic pressure transducer 13, described braking simulator 12 and described master brake cylinder 2 hydraulic communication, be used to receive the output hydraulic pressure of master brake cylinder 2, described hydraulic pressure transducer 13 is installed on the described braking simulator 12, is used for detecting the hydraulic pressure that receives of braking simulator 12 and this hydraulic pressure is converted to electric signal sending to electronic control unit 20.
Below with reference to Fig. 4 the operating process of another kind of embodiment of the present invention is described in detail.
As shown in Figure 4, when brake pedal 1 action,, and should move electric signal and sent to electronic control unit 20 at first by the action of contact switch 11 sensing brake pedals 1.When brake pedal 1 was trampled, the position of described contact switch 11 inductive brake pedals 1 was moved and this position is moved and is converted to electric signal and sends to electronic control unit 20, and described electronic control unit 20 receives these electric signal and also controls normally open solenoid valve 3 and close.Simultaneously, when brake pedal 1 was trampled, the output hydraulic pressure in the master brake cylinder 2 will raise, owing to normally open solenoid valve 3 has cut out, so this output hydraulic pressure will all be delivered in the master cylinder hydraulic pressure simulator 14.When described master cylinder hydraulic pressure simulator 14 receives the output hydraulic pressure of master brake cylinder 2, this output hydraulic pressure that receives is converted into electric signal sends to electronic control unit 20, described electronic control unit 20 receives this electric signal and modulated pressure brake equipment 30 drives described brake wheel cylinder 4 actions.
Similar to the above embodiments, when if the brake pedal that depresses 1 is released, contact switch 11 detects this and unclamps action, then this action is converted into electric signal and sends to electronic control unit 20, then by the brake operating of electronic control unit 20 modulated pressure brake equipments 30 brake off wheel cylinders 4, but make vehicle return to motoring condition.
In this embodiment, the function of contact switch 11 is control normally open solenoid valve 3 closures, and the function of master cylinder hydraulic pressure simulator 14 then is 4 brakings of control brake wheel cylinder.In addition, the stroke of trampling of described brake pedal 1 preferably is directly proportional with the output hydraulic pressure of master brake cylinder 2.So, be similar to the above embodiments, preferably make master cylinder hydraulic pressure simulator 14 detect output hydraulic pressure electric signal and be linear relationship between the electric signal of electronic control unit 20 with sending to, make braking force that electronic control unit 20 modulated pressure brake equipments 30 produce and brake pedal 1 trample apart from or the output hydraulic pressure of master brake cylinder 2 be directly proportional.
Fig. 5 is the structural representation of a kind of exemplary embodiment of the present invention, and wherein the hydraulic pressure transfer path is represented with solid line, and the electric signal transmission path dots.Fig. 6 is the operational flowchart of embodiment among Fig. 5.
As shown in Figure 5, described pedal detecting device 10 comprises contact switch 11, braking simulator 12 and hydraulic pressure transducer 13, the position that described contact switch 11 is used for inductive brake pedal 1 is moved and this position is moved and is converted to electric signal and sends to electronic control unit 20, described braking simulator 12 and described master brake cylinder 2 hydraulic communication, described hydraulic pressure transducer 13 is installed on the described braking simulator 12, be used for detecting the hydraulic pressure of braking simulator 12 and this hydraulic pressure is converted to electric signal and send to the common switched electrical signal device of electronic control unit 20. contact switchs 11 for often using in this area, can produce the signal-powered sub-control unit 20 of power on/off with return according to stepping on of brake pedal uses. and braking simulator 12 can adopt any suitable braking simulator of the prior art. in the present invention, the braking liquid that master brake cylinder 2 produces enters in the hydraulic cavities of braking simulator 12, thereby promote a piston apparatus and oppress a spring installation, the antagonistic force that spring installation produced is the feel power that chaufeur is felt.
Described hydraulic brake system 30 can comprise the Hydraulic Pump 32 that is driven by motor 31, this Hydraulic Pump 32 and described brake wheel cylinder 4 fluid pressure linkages.That is, drive Hydraulic Pump 32 work by motor 31, the high-pressure fluid that Hydraulic Pump 32 is produced is delivered in the driving wheel cylinder 4, makes to drive wheel cylinder 4 work, thereby realizes vehicle braked.Motor 31 provides power by supply unit 36.This supply unit 36 can be the storage battery that provides separately, also can be provided by the electrokinetic cell on the electronlmobil.
Under the preferable case, in order further to guarantee the safety of vehicle driving braking, system provided by the invention also comprises brake fluid pressure sensor 33, and described hydraulic brake system 30 can also comprise fluid reservoir 34 and normally closed solenoid valve 35.
Described brake fluid pressure sensor 33 is used for detecting the hydraulic pressure of this hydraulic tubing and this hydraulic pressure is converted into electric signal and send to electronic control unit 20 on the hydraulic tubing that is connected between Hydraulic Pump 32 and the brake wheel cylinder 4.Described fluid reservoir 34 connects described Hydraulic Pump 32, is Hydraulic Pump 32 fluid replacement.Described normally closed solenoid valve 35 is a closed condition under its normal circumstances on the hydraulic tubing that is connected between described Hydraulic Pump 32 and the described brake wheel cylinder 4, is used to receive the electric signal of electronic control unit 20 and opens or closed.
Below with reference to Fig. 6 the working process of above-mentioned typical brake system of the present invention is described in detail.
As shown in Figure 6, in the normal vehicle operation process, contact switch 11 is braked pedal 1 and withstands and be in normally open.When brake pedal 1 action, at first send to electronic control unit 20 by the action of contact switch 11 sensing brake pedals 1 and the electric signal that should move, judge that by electronic control unit the action of brake pedal 1 is trample action or unclamps action then.When the action of brake pedal 1 was trample action, electronic control unit 20 was at first controlled normally open solenoid valve 3 closures, cut off the hydraulic circuit passage between master brake cylinder 2 and the brake wheel cylinder 4.At this moment, the high hydraulic brake fluid that flows out from master brake cylinder 2 enters into braking simulator 12, and the braking liquid hydraulic pressure in the braking simulator 12 increases with the increase of brake pedal 1 stroke, and effect is the braking feel of drive simulating person's glancing impact.The hydraulic pressure transducer 13 that is installed on the braking simulator 12 detects the hydraulic pressure of braking in the simulator 12, and this hydraulic pressure electric signal is sent to electronic control unit 20.
After beginning was carried out in braking, in normally open solenoid valve 3 closures, motor 31 drove Hydraulic Pump 32 immediately and starts working, and pumps into high-voltage braking liquid in brake wheel cylinder 4, to realize the purpose of automobile brake.Simultaneously, be installed on the brake fluid pressure sensor 33 continuous brake fluid pressures that detect brake wheel cylinder 4 between brake wheel cylinder 4 and the Hydraulic Pump 32, and electric signal is sent to electronic control unit 20.
For braking force that energy assisted braking system produced and the chaufeur braking intention fit that guarantees electronic control, under the preferable case, electronic control unit 20 is set a hydraulic pressure rated value according to the electric signal of the expression braking force size that hydraulic pressure transducer 13 sends, electric signal and this hydraulic pressure rated value of the expression brake wheel cylinder 4 brake fluid pressure sizes that sensor 33 is sent compare, the electric signal of the expression brake wheel cylinder 4 brake fluid pressure sizes that send when sensor 33 is during greater than this rated value, electronic control unit sends electric signal, open normally closed solenoid valve 35, reduce the hydraulic pressure in the brake wheel cylinder 4, and when the hydraulic pressure electric signal is equal to or less than with reference to hydraulic pressure, then close normally closed solenoid valve 35, motor 31 works on, and provides high-voltage oil liquid in brake wheel cylinder 4.Thus, effective braking of automobile can be realized, the locking phenomenon of wheel can also be prevented.Described hydraulic pressure rated value is a value that is equal to or greater than the electric signal of the expression braking force size that sensor 13 sends, as be the expression braking force size that sends of sensor 13 electric signal 1-1.2 doubly, be preferably 1.05-1.1 times value.
In order further to guarantee the safety of braking, in electronic control unit 20, set the electric signal of an expression hydraulic pressure minimum value, if the electric signal of the brake fluid pressure of brake fluid pressure sensor 33 detected expression brake wheel cylinders 4 or the output hydraulic pressure of Hydraulic Pump 32 is less than the electric signal of this expression hydraulic pressure minimum value, show that promptly electric control hydraulic braking of the present invention system exists fault or braking force vehicle effectively can not be braked, in this case, brake fluid pressure sensor 33 sends to electronic control unit 20 with the hydraulic pressure electric signal that detected brake wheel cylinder 4 receives, open by electronic control unit 20 control normally open solenoid valves 3 then, at this moment, high hydraulic brake fluid in the master brake cylinder 2 will flow in the brake wheel cylinder 4 by normally open solenoid valve 3 rapidly, realize vehicle braked by brake wheel cylinder 4, having improved the safety of vehicle driving braking thus greatly. the electric signal of described hydraulic pressure minimum value is set for the minimum value of the output hydraulic pressure of the brake fluid pressure of the different vehicle needed brake wheel cylinder 4 of effective braking or Hydraulic Pump 32, generally speaking, the electric signal of described hydraulic pressure minimum value is to be equal to or greater than the effectively electric signal of the minimum output hydraulic pressure of the brake fluid pressure of the different needed brake wheel cylinder 4 of vehicle of braking or Hydraulic Pump 32 of expression. for example, the electric signal of described hydraulic pressure minimum value for expression effectively the telecommunications of the minimum output hydraulic pressure of the brake fluid pressure of the different needed brake wheel cylinder 4 of vehicle of braking or Hydraulic Pump 32 1-1.2 doubly, be preferably 1.05-1.1 doubly.
When if desired but the vehicle of braking being returned to motoring condition, operate according to the opposite process of above-mentioned operating process basically.That is, when being unclamped by the brake pedal 11 that depressed, contact switch 11 detects this and unclamps action and this information is sent to electronic control unit 20, then by the brake operating of electronic control unit 20 modulated pressure brake equipments 30 brake off wheel cylinders 4.Particularly, the motor 31 of electronic control unit 20 in can modulated pressure brake equipment 30 stops action, controls then that normally closed solenoid valve 35 is opened so that the braking liquid in the brake wheel cylinder 4 can flow in the fluid reservoir 34 through the normally closed solenoid valve of opening 35.Meanwhile or afterwards, the control that electronic control unit 20 is removed normally open solenoid valve 3 makes normally open solenoid valve 3 return to open mode.
Braking system of electric car of the present invention can also be contacted before brake wheel cylinder 4 and be used ABS, and this moment, brake fluid pressure sensor 33 detected hydraulic pressure were the brake fluid pressure between ABS and the Hydraulic Pump 32.
Claims (12)
1. braking system of electric car, this brake system comprises brake pedal (1), with brake pedal (1) bonded assembly master brake cylinder (2) and with the brake wheel cylinder (4) of master brake cylinder (2) fluid pressure linkage, it is characterized in that: this brake system also comprises normally open solenoid valve (3), pedal detecting device (10), electronic control unit (20) and hydraulic brake system (30), described normally open solenoid valve (3) is positioned on the hydraulic tubing that is connected between master brake cylinder (2) and the brake wheel cylinder (4), described hydraulic brake system (30) and described brake wheel cylinder (4) fluid pressure linkage, the position of described pedal detecting device (10) sensing brake pedal (1) is moved and this position is moved and is converted into the electric signal that moves of expression position and sends to electronic control unit (20), described electronic control unit (20) receives this electric signal, the closed also while modulated pressure brake equipment (30) of control normally open solenoid valve (3) drives described brake wheel cylinder (4) action, described hydraulic brake system (30) comprises the Hydraulic Pump (32) that is driven by motor (31), this Hydraulic Pump (32) and described brake wheel cylinder (4) fluid pressure linkage, electronic control unit (20) is controlled described motor (31) action, wherein, described brake system also comprises brake fluid pressure sensor (33), and this brake fluid pressure sensor (33) is positioned on the hydraulic tubing that is connected between Hydraulic Pump (32) and the brake wheel cylinder (4); When described brake fluid pressure sensor (33) detected hydraulic pressure in the hydraulic tubing between Hydraulic Pump (32) and the brake wheel cylinder (4) and is lower than rated value, described electronic control unit (20) received this electric signal and controls described normally open solenoid valve (3) and open; When described normally open solenoid valve (3) when opening, the high hydraulic brake fluid of described master brake cylinder (2) flows into described brake wheel cylinder (4) to realize braking by described normally open solenoid valve (3).
2. braking system of electric car according to claim 1, wherein, brake pedal (1) is when being operated, the electric signal that the expression brake pedal (1) that pedal detecting device (10) will sense is operated sends to electronic control unit (20), electronic control unit (20) receives this electric signal, control normally open solenoid valve (3) cuts out, and modulated pressure brake equipment (30) drives described brake wheel cylinder (4) braking simultaneously; When brake pedal (1) is released, the released electric signal of expression brake pedal (1) that pedal detecting device (10) will sense sends to electronic control unit (20), electronic control unit (20) receives this electric signal, and modulated pressure brake equipment (30) drives described brake wheel cylinder (4) brake off.
3. braking system of electric car according to claim 1 and 2, wherein, pedal detecting device (10) is for being installed in contact switch (11) or the pedal sensor on the brake pedal (1).
4. braking system of electric car according to claim 1 and 2, wherein, pedal detecting device (10) moves for position that can sensing brake pedal (1) and the pedal detecting device of the stroke that move brake pedal (1) position, or the combination of the pedal detecting device of the pedal detecting device that moves of position that can sensing brake pedal (1) and the stroke that can sensing brake pedal (1) position moves; Pedal detecting device (10) is gone back the stroke that move sensing brake pedal (1) position, and the electric signal that will represent the stroke that move brake pedal (1) position sends to electronic control unit (20), the electric signal of the stroke that electronic control unit (20) moves according to expression brake pedal (1) position that pedal detecting device (10) senses, modulated pressure brake equipment (30) drives the dynamics of described brake wheel cylinder (4).
5. braking system of electric car according to claim 4, wherein, the electric signal of the stroke that move expression brake pedal (1) position that pedal detecting device (10) sends represents that the stroke that moves brake pedal (1) position is big more, and the dynamics that modulated pressure brake equipment (30) drives described brake wheel cylinder (4) is big more.
6. braking system of electric car according to claim 4, wherein, pedal detecting device (10) comprises contact switch (11) and the pedal sensor that is installed on the brake pedal (1), the position that described contact switch (11) detects brake pedal (1) is moved and this position is moved and is converted to electric signal and sends to electronic control unit (20), and described electronic control unit (20) receives this electric signal and controls normally open solenoid valve (3) and close; Simultaneously, also this shift motion is converted to electric signal sends to electronic control unit (20) to the shift motion of described pedal sensor inductive brake pedal (1), described electronic control unit (20) receives this electric signal, according to the size of the shift motion of the brake pedal that senses (1), modulated pressure brake equipment (30) drives the dynamics of described brake wheel cylinder (4).
7. braking system of electric car according to claim 6, wherein, described pedal sensor is the displacement pickup that is used for sensing brake pedal (1) moving displacement, or be used for sensing brake pedal (1) and turn over the angular transducer of angle around the shaft, or be used for the stressed hydraulic pressure transducer of sensing brake pedal (1) downside support zone.
8. braking system of electric car according to claim 1 and 2, wherein, pedal detecting device (10) comprise the contact switch (11) that is installed on the brake pedal (1) and with the master cylinder hydraulic pressure simulator (14) of master brake cylinder (2) hydraulic communication, the position that described contact switch (11) detects brake pedal (1) is moved and this position is moved and is converted to electric signal and sends to electronic control unit (20), and described electronic control unit (20) receives this electric signal and controls normally open solenoid valve (3) and close; Simultaneously, the output hydraulic pressure of described master cylinder hydraulic pressure simulator (14) inductive brake master cylinder (2) also should be exported hydraulic pressure and is converted to electric signal and sends to electronic control unit (20), described electronic control unit (20) receives this electric signal, according to the size of the output hydraulic pressure of the master brake cylinder that senses (2), modulated pressure brake equipment (30) drives the dynamics of described brake wheel cylinder (4).
9. braking system of electric car according to claim 8, wherein, the output hydraulic pressure of the master brake cylinder (2) that master cylinder hydraulic pressure simulator (14) senses is big more, and the dynamics that modulated pressure brake equipment (30) drives described brake wheel cylinder (4) is big more.
10. braking system of electric car according to claim 9, wherein, described master cylinder hydraulic pressure simulator (14) comprises braking simulator (12) and hydraulic pressure transducer (13), described braking simulator (12) and described master brake cylinder (2) hydraulic communication, be used to receive the output hydraulic pressure of master brake cylinder (2), described hydraulic pressure transducer (13) is installed on the described braking simulator (12), is used for detecting the hydraulic pressure that receives of braking simulator (12) and this hydraulic pressure is converted to electric signal sending to electronic control unit (20).
11. braking system of electric car according to claim 1 and 2, wherein, described hydraulic brake system (30) also comprises fluid reservoir (34) and the normally closed solenoid valve (35) that is communicated with Hydraulic Pump (32); Described normally closed solenoid valve (35) is positioned on the hydraulic tubing that is connected between described fluid reservoir (34) and the described brake wheel cylinder (4), and the electric signal that described electronic control unit (20) sends according to described brake fluid pressure sensor (33) is controlled the action of described normally closed solenoid valve (35) and normally open solenoid valve (3).
12. braking system of electric car according to claim 11, wherein, when described brake fluid pressure sensor (33) detected hydraulic pressure overrate in the hydraulic tubing between Hydraulic Pump (32) and the brake wheel cylinder (4), described electronic control unit (20) received this electric signal and controls described normally closed solenoid valve (35) and open.
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| CN200610140135A CN101152864B (en) | 2006-09-30 | 2006-09-30 | Braking system of electric car |
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| CN200610140135A CN101152864B (en) | 2006-09-30 | 2006-09-30 | Braking system of electric car |
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| CN101152864B true CN101152864B (en) | 2010-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103754210A (en) * | 2014-01-08 | 2014-04-30 | 同济大学 | Motor-driven electronic hydraulic braking system |
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| US8083294B2 (en) * | 2008-10-06 | 2011-12-27 | Ford Global Technologies | Braking system for hybrid vehicle |
| CN101863269A (en) * | 2010-06-18 | 2010-10-20 | 奇瑞汽车股份有限公司 | Electronic braking pedal |
| DE112014004233B4 (en) * | 2013-09-16 | 2023-08-03 | Ipgate Ag | Braking device and method for operating a braking device |
| CN108528420A (en) * | 2018-03-28 | 2018-09-14 | 浙江吉利控股集团有限公司 | A kind of motor vehicle braking system and braking method |
| CN112660095B (en) * | 2019-10-15 | 2022-03-18 | 比亚迪股份有限公司 | Hydraulic device for brake system, brake system and vehicle |
| CN112224189B (en) * | 2019-12-18 | 2022-08-05 | 北京国家新能源汽车技术创新中心有限公司 | Electronic control oil pressure braking system and vehicle |
| CN112298145A (en) * | 2020-10-09 | 2021-02-02 | 乌鲁木齐钵施然智能农机有限公司 | Electric control hydraulic oil brake device and method |
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| US5607209A (en) * | 1994-06-06 | 1997-03-04 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Braking apparatus and braking method for vehicle |
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| US5607209A (en) * | 1994-06-06 | 1997-03-04 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Braking apparatus and braking method for vehicle |
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| CN103754210A (en) * | 2014-01-08 | 2014-04-30 | 同济大学 | Motor-driven electronic hydraulic braking system |
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