CN101879892B - Vehicle braking system - Google Patents
Vehicle braking system Download PDFInfo
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- CN101879892B CN101879892B CN 200910136465 CN200910136465A CN101879892B CN 101879892 B CN101879892 B CN 101879892B CN 200910136465 CN200910136465 CN 200910136465 CN 200910136465 A CN200910136465 A CN 200910136465A CN 101879892 B CN101879892 B CN 101879892B
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- 239000000446 fuel Substances 0.000 claims abstract description 170
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 239000010720 hydraulic oil Substances 0.000 claims description 109
- 239000012530 fluid Substances 0.000 claims description 96
- 239000003921 oil Substances 0.000 claims description 64
- 238000004891 communication Methods 0.000 claims description 9
- 230000009183 running Effects 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000881 depressing effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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Abstract
The invention discloses a vehicle braking system, which comprises a brake pedal, a hydraulic control valve, a hydraulic power source, a fuel storage tank, a brake cylinder, a sensor and a controller. The hydraulic control valve is provided with a fuel inlet, a fuel outlet and a fuel return port and is used for controlling connection and disconnection of the fuel inlet, the fuel outlet and the fuel return port; the hydraulic power source comprises a fuel storage tank, a high-pressure fuel storage device and a hydraulic pump driven by a motor, wherein the fuel storage tank is communicated with the fuel return port through a hydraulic pipeline, the fuel storage tank, the hydraulic pump and the high-pressure fuel storage device are all communicated through hydraulic pipelines, the hydraulic pump can deliver hydraulic fuel in the fuel storage tank into the high-pressure fuel storage device, a one-way valve is arranged between the hydraulic pump and the high-pressure fuel storage device, the hydraulic fuel can only flow from the hydraulic pump to the high-pressure fuel storage device, and the high-pressure fuel storage device is communicated with the fuel inlet through a hydraulic pipeline; the brake cylinder is communicated with the fuel outlet; the sensor is used for detecting the pressure of the hydraulic fuel in the high-pressure fuel storage device; and the controller is electrically connected with the sensor and the motor and is used for controlling the motor according to the detection value of the sensor. The vehicle braking system has the advantages of compact structure and high reliability.
Description
Technical field
The present invention relates to a kind of motor vehicle braking system, more particularly, relate to a kind of brake system for battery-driven car or hybrid vehicle.
Background technology
For being the conventional truck of power with the driving engine, usually adopt the vacuum servo hydraulic brake system, this vacuum servo hydraulic brake system utilizes the vacuum of engine intake manifold generation or produces vacuum by the crank-driven vacuum pump, thereby reaches vacuum-assisted effect.For some engineering trucks, adopt hydraulic brake system usually, in this hydraulic brake system, need produce the high voltage power source by Engine driven Hydraulic Pump.
But, which kind of mode no matter, traditional brake system is if want to obtain the power that brake action all must rely on driving engine.But for hybrid vehicle, under electric model, driving engine is out-of-run, thereby traditional brake system can not play brake action in this case; For battery-driven car, owing to do not equip driving engine at all, thereby traditional brake system also can not be suitable for fully.
For this reason, Chinese utility model patent CN201128414Y has proposed a kind of electronlmobil vacuum booster unit.But, owing to be provided with bulky vacuum pump and vacuum reservoir in this electronlmobil vacuum booster unit, thereby in the vehicle that space utilization is had relatively high expectations, this electronlmobil vacuum booster unit can have a strong impact on the riding space of vehicle, arranges that difficulty is bigger.
Summary of the invention
The objective of the invention is to overcome the defective of existing motor vehicle braking system difficulty in arrangement, and the motor vehicle braking system of a kind of compact conformation and easy arrangement is provided.
According to an aspect of the present invention, provide a kind of motor vehicle braking system, this motor vehicle braking system comprises: brake pedal, handle this brake pedal so that described motor vehicle braking system applies braking force to the wheel of vehicle; Fluid control valve, this fluid control valve comprises the valve body with valve pocket and the valve core that can move in described valve pocket, described valve body is provided with oil inlet, oil outlet and return opening, described valve core is positioned at the outer end of described valve body and is connected with described brake pedal, driving by described brake pedal, described valve core is mobile in described valve pocket, closes with the connected sum of controlling described oil inlet, oil outlet and return opening; Hydraulic efficiency power unit, this hydraulic efficiency power unit comprise petrol storage tank, high pressure fuel accumulator and by motor-driven Hydraulic Pump, wherein, described petrol storage tank is communicated with by hydraulic tubing with described return opening; Described petrol storage tank, described Hydraulic Pump are communicated with by hydraulic tubing with described high pressure fuel accumulator, and described Hydraulic Pump is transported to the hydraulic oil in the described petrol storage tank in the described high pressure fuel accumulator, be provided with check valve in the hydraulic tubing between described Hydraulic Pump and high pressure fuel accumulator, this check valve only allows hydraulic oil to flow to described high pressure fuel accumulator from described Hydraulic Pump, and described high pressure fuel accumulator is communicated with by hydraulic tubing with described oil inlet; Brake wheel cylinder, this brake wheel cylinder is communicated with by hydraulic tubing with described oil outlet; Sensor, this sensor is for detection of the pressure of hydraulic oil in the described high pressure fuel accumulator; Controller, this controller is electrically connected with described sensor and motor, is used for controlling described motor to the driving of Hydraulic Pump according to the detected force value of described sensor.
In motor vehicle braking system provided by the present invention, utilize hydraulic efficiency pressure system to realize the power-assisted of braking, and do not use traditional vacuum servo system, thereby omitted bigger vacuum pump and the vacuum reservoir of volume, have more compact design, the layout in vehicle is more convenient.
And, the drive element of motor vehicle braking system provided by the present invention is motor-driven Hydraulic Pump, rather than traditional driving engine, thereby as long as vehicle can provide electric power to motor, brake system of the present invention just can be brought into play brake action, and is whether irrelevant with engine starting.Therefore, brake system reliability provided by the present invention is higher, is suitable for being applied in elec. vehicle or the motor vehicle driven by mixed power, also can be applicable to in the orthodox car of driving engine as propulsion source.
Description of drawings
Fig. 1 is the scheme drawing according to one embodiment of the present invention;
Fig. 2 is the connection diagram according to two high pressure fuel accumulators in the another embodiment of the present invention;
Fig. 3 is the scheme drawing of two fluid control valves in another embodiment according to the present invention;
Fig. 4 is a kind of scheme drawing of preferred implementation also according to the present invention;
Fig. 5 is the scheme drawing of another preferred implementation according to the present invention;
Fig. 6 is the structural representation according to fluid control valve of the present invention.
The specific embodiment
Below with reference to accompanying drawing the specific embodiment of the present invention is described in detail.
As shown in Figure 1, the invention provides a kind ofly for the vehicle braked system, this brake system comprises:
Fluid control valve 2, this fluid control valve 2 comprises the valve body 22 with valve pocket 21 and the valve core 23 that can move in described valve pocket 21, described valve body 21 is provided with oil inlet 24, oil outlet 25 and return opening 26, described valve core 23 is positioned at described valve body 22 outer ends and is connected with described brake pedal 1, driving by described brake pedal 1, described valve core 23 can move in described valve pocket 21, closes with the connected sum of controlling described oil inlet 24, oil outlet 25 and return opening 26;
Brake wheel cylinder 4, this brake wheel cylinder 4 and described oil outlet 25 are communicated with by hydraulic tubing;
The motor vehicle braking system that provides according to this embodiment, because sensor 56 can detect the pressure of hydraulic oil in the high pressure fuel accumulator 54, in case this insufficient pressure, then controller 57 (as PLC or ECU) is understood starter motor 51, thereby drive Hydraulic Pump 52 runnings, will be stored in petrol storage tank 3 mesolow hydraulic oil pumps and be pressed onto in the high pressure fuel accumulator 54.Therefore, the hydraulic oil that stores in high pressure fuel accumulator 54 is generally high-pressure and hydraulic oil.And, because the hydraulic tubing between Hydraulic Pump 52 and the high pressure fuel accumulator 54 is provided with check valve 53, and only allow hydraulic oil to flow to described high pressure fuel accumulator 54 from described Hydraulic Pump 52, thereby, high-pressure and hydraulic oil in the high pressure fuel accumulator 54 can not flow in the petrol storage tank 3 by Hydraulic Pump 52 again, thereby can avoid causing in the petrol storage tank 3 adverse effect of Hydraulic Pump 52 and the decline of the high pressure fuel accumulator 54 interior hydraulic fluid pressures that cause because high-pressure and hydraulic oil flows into by Hydraulic Pump 52.
When brake pedal 1 was not operated, the high-pressure and hydraulic oil in the high pressure fuel accumulator 54 that fluid control valve 2 does not allow to be communicated with oil inlet 24 flowed in the brake wheel cylinder 4, thereby brake wheel cylinder 4 can be to the wheel braking of vehicle.
When stepping on brake pedal 1,2 of fluid control valves can allow high-pressure and hydraulic oil to enter this fluid control valve 2 by oil inlet 24, and flow into the brake wheel cylinder 4 from oil outlet 25, thereby play brake action.
Behind loosen the brake 1, hydraulic brake valve 2 can return to initial condition, and namely high-pressure and hydraulic oil can not enter in the brake wheel cylinder 4 through fluid control valve 2, can not play the state of brake action.
By to the structure of the motor vehicle braking system of present embodiment and the description of basic operational process, those of ordinary skills should be understood that, brake system of the present invention does not rely on driving engine propulsive effort is provided, nor need parts such as bulky vacuum pump or vacuum reservoir, but utilize motor-driven hydraulic pumps and the high-pressure and hydraulic oil that produces is stored in the high pressure fuel accumulator, determine whether high-pressure and hydraulic oil is transported in the brake wheel cylinder by the fluid control valve 2 that is connected with brake pedal 1, thereby determine whether to produce brake action.
Therefore, compare with the brake system of prior art, not only have higher reliability, and shared space is littler, be convenient in the small space of vehicle, arrange.
For example, pedal can be installed in before the automobile on the coaming plate, fluid control valve can arrange the input push rod and connect by lock pin with pedal perpendicular to preceding coaming plate.That is to say that brake pedal at first is connected with the input push rod of fluid control valve, when stepping on brake pedal, the valve core that drives fluid control valve by the input push rod again moves.
Hydraulic brake valve 2 is directional control valve, and whether the high-pressure and hydraulic oil that is used for control high pressure fuel accumulator 54 flows in the brake wheel cylinder 4, thereby determines whether brake.Preferably, this fluid control valve 2 is spool-type valves.
As shown in Figure 6, this fluid control valve 2 is the 3-position-3-way valve, comprise the valve body 22 with valve pocket 21 and the valve core 23 that can in described valve pocket 21, move, described valve body 21 is provided with oil inlet 24, oil outlet 25 and return opening 26, described valve core 23 is positioned at described valve body 22 outer ends and is connected with described brake pedal 1, driving by described brake pedal 1, described valve core 23 can move in described valve pocket 21, closes to control between described oil inlet 24, oil outlet 25 and the return opening 26 connected sum in described valve pocket 21.Control process about this fluid control valve 2 will be described in detail hereinafter.
In addition, hydraulic efficiency power unit 5 provides hydraulic drive source for hydraulic brake system of the present invention.As shown in Figure 1, Hydraulic Pump 52 and high pressure fuel accumulator 54 that this hydraulic efficiency power unit comprises petrol storage tank 3, driven by motor 51, wherein, described petrol storage tank 3 and described return opening 26 are communicated with by hydraulic tubing; Described petrol storage tank 3, described Hydraulic Pump 52 and described high pressure fuel accumulator 54 are communicated with by hydraulic tubing, and described Hydraulic Pump 52 is transported to the hydraulic oil in the described petrol storage tank 3 in the described high pressure fuel accumulator 54, be provided with check valve 53 in the hydraulic tubing between described Hydraulic Pump 52 and high pressure fuel accumulator 54, this check valve 53 only allows hydraulic oil to flow to described high pressure fuel accumulator 54 from described Hydraulic Pump 52, and described high pressure fuel accumulator 54 also is communicated with by hydraulic tubing with described oil inlet 24.
In this hydraulic efficiency power unit 5, utilize Hydraulic Pump 52 that the hydraulic oil pump of relatively low pressure (depressing at normal atmosphere) is pressed onto in the high pressure fuel accumulator 54, and utilize check valve 53 to prevent high-pressure and hydraulic oil through the backflow of Hydraulic Pump 52, thereby high-pressure and hydraulic oil is stored in the high pressure fuel accumulator 54.
This hydraulic efficiency power unit 5 cooperatively interacts with above-mentioned fluid control valve 2, to determine whether high-pressure and hydraulic oil is transported in the brake wheel cylinder 4.High pressure fuel accumulator 54 is communicated with the oil inlet 24 of fluid control valve 2 by hydraulic tubing, and the return opening 26 of fluid control valve 2 and petrol storage tank 3 are communicated with by hydraulic tubing, and the oil outlet 25 of fluid control valve 2 and brake wheel cylinder 4 are communicated with by hydraulic tubing.According to different working conditions, the connected sum between fluid control valve 2 meeting control described oil inlet 24, oil outlet 25 and the return openings 26 in valve pocket 21 is closed, thereby determines whether to produce braking.
The oil outlet 25 of brake wheel cylinder 4 and fluid control valve 2 is communicated with by hydraulic tubing, and when high-pressure and hydraulic oil entered this brake wheel cylinder 4, this brake wheel cylinder 4 can produce brake action to wheel.Brake wheel cylinder 4 is traditional brake wheel cylinder that is usually used on the vehicle, and its structure and principle of work are familiar with by those skilled in the art, repeat no more here.
For the hydraulic oil in the high pressure fuel accumulator 54 is remained in the reasonable range, preferably, when the pressure of hydraulic oil is less than first predetermined value in sensor 56 detects high pressure fuel accumulator 54, controller 57 starter motors 51, drive Hydraulic Pump 52 hydraulic oil in the petrol storage tank 3 is pumped in the high pressure fuel accumulator 54, first predetermined value is the minimum pressure values of hydraulic oil in the required high pressure fuel accumulator 54 of brake wheel cylinder 4; When the pressure of hydraulic oil equals second predetermined value in sensor 56 detects high pressure fuel accumulator 54, controller 57 stops motor 51, make Hydraulic Pump 52 stop the hydraulic oil in the petrol storage tank 3 is pumped in the high pressure fuel accumulator 54, second predetermined value is greater than first predetermined value and be less than or equal to the maximum pressure value of the hydraulic oil that high pressure fuel accumulator 54 can bear.
Described first predetermined value is the minimum pressure values of hydraulic oil in the brake wheel cylinder 4 required high pressure fuel accumulator 54, when the pressure of hydraulic oil in the high pressure fuel accumulator 54 reached this first predetermined value, the high-pressure and hydraulic oil that enters in the brake wheel cylinder 4 could be brought into play brake action effectively.According to first predetermined value, when the pressure of hydraulic oil was less than first predetermined value in sensor 56 detects high pressure fuel accumulator 54, controller 57 starter motors 51 drove Hydraulic Pump 52 hydraulic oil pump in the petrol storage tank 3 are pressed onto in the high pressure fuel accumulator 54.
First predetermined value can be 8-12Mpa, and preferably, this first predetermined value is 11-12Mpa.
If detecting the pressure of the hydraulic oil in the high pressure fuel accumulator 54, sensor is lower than first predetermined value, then can primer fluid press pump 52 to high pressure fuel accumulator 54 pump pressure hydraulic oil, but the pressure of hydraulic oil need be controlled in the reasonable scope in the high pressure fuel accumulator 54, in order to avoid hydraulic efficiency pressure system is caused adverse effect.Therefore, preferably, when the pressure of hydraulic oil reaches second predetermined value in sensor detects high pressure fuel accumulator 54, Hydraulic Pump 52 is stopped to high pressure fuel accumulator 54 delivery hydraulic pressure oil.This second predetermined value is greater than first predetermined value and be less than or equal to the maximum pressure value of the hydraulic oil that high pressure fuel accumulator 54 can bear.
Second predetermined value can be 20-30Mpa, and preferably, this second predetermined value is 25Mpa.
If motor 51 continuous firings (pressure that shows hydraulic oil in the high pressure fuel accumulator 54 does not reach required level (as reaching first predetermined value at least)), perhaps or even the long time of motor 51 continuous firings, the pressure of hydraulic oil can not reach first predetermined value, then the problem of leaking occurs at the high pressure fuel accumulator 54 that stores high-pressure and hydraulic oil and hydraulic tubing probably.
Therefore, in order in time to report to the police to the driver, to prevent dangerous the generation, preferably, when motor 51 continuous runnings after the schedule time, controller 57 sends failure alarm signal, and the schedule time is to instigate the pressure of hydraulic oil in the high pressure fuel accumulator 54 to reach the required time of second predetermined value from first predetermined value.
That is to say, for Hydraulic Pump and the high pressure fuel accumulator determined, utilize Hydraulic Pump pump pressure hydraulic oil in the high pressure fuel accumulator 54, with with the pressure of hydraulic oil in the high pressure fuel accumulator 54 from first predetermined value bring up to time of second predetermined value normally constant (for example, under the normal circumstances, just can make the pressure of hydraulic oil in the high pressure fuel accumulator 54 bring up to second predetermined value from first predetermined value fully with time of 5-7 second).If motor 51 continuous runnings predetermined time (this time is generally brought up to the required time of second predetermined value with the pressure of hydraulic oil in the high pressure fuel accumulator 54 from first predetermined value above above-mentioned), the pressure that hydraulic oil in the high pressure fuel accumulator 54 is described does not still reach second predetermined value, obvious this phenomenon is irrational, might have defectives such as leakage.Therefore, motor 51 continuous runnings can send failure alarm signal by controller 57 after the schedule time, remind the driver to note.
On the other hand, for the pressure that prevents hydraulic oil in the high pressure fuel accumulator 54 surpasses second predetermined value, thereby influence the reliability of hydraulic efficiency pressure system (as Hydraulic Pump, hydraulic tubing etc.), preferably, be provided with pressure-relief valve 55 in the hydraulic tubing between high pressure fuel accumulator 54 and petrol storage tank 3.This pressure-relief valve 55 is check valve, and only when the pressure of hydraulic oil in the high pressure petrol storage tank 54 during greater than second predetermined value, this pressure-relief valve 55 just can open and allow the hydraulic oil in the high pressure petrol storage tank 54 to flow to petrol storage tank 3.
In other words, when the pressure of the hydraulic oil in the high pressure petrol storage tank 54 was between first predetermined value and second predetermined value, this pressure-relief valve 55 can not opened, and is in to separate (not being communicated with) state.And when the pressure of the hydraulic oil in the high pressure petrol storage tank 54 is higher than second predetermined value, this pressure-relief valve 55 is in connected state, unnecessary hydraulic oil is discharged in the petrol storage tank 3, the pressure of the hydraulic oil in high pressure petrol storage tank 54 is not higher than till second predetermined value, thereby can reduce the high pressure fuel accumulator 54 of storage high-pressure and hydraulic oil and the possibility that leakage defect appears in pipeline.
Below fluid control valve 2 is described in detail.
As shown in Figure 1, the end that the valve core 23 of fluid control valve 2 is connected with brake pedal 1 is connected with brake pedal 1 by elastic component 31, the other end of valve core 23 is provided with return unit 32, when brake pedal 1 was not operated, the application force of 32 pairs of described valve cores 23 of this return unit made this valve core 23 be positioned at primary importance.
One end of valve core 23 is connected with brake pedal 1 by elastic component 31, thereby can play buffer action, and can give the feedback of driver with brake action.The other end of valve core 23 is provided with return unit 32 (as spring) in valve pocket 21, the force direction of 32 pairs of valve cores 32 of this return unit is towards the end that is connected with brake pedal 1, thereby, when not stepping on brake pedal 1, valve core 23 is positioned at primary importance, namely in Fig. 6, be positioned at the position of the rightmost side, perhaps abbreviate right position as.
When this primary importance (or right position), do not need brake system to play brake action, therefore, in described primary importance, described hydraulic brake valve 2 is controlled to be: oil outlet 25 is communicated with return opening 26, and oil inlet 24 is not communicated with oil outlet 25 and return opening 26.Like this, high-pressure and hydraulic oil can not enter in the brake wheel cylinder 4 by oil inlet 24, and the pressure of the hydraulic oil in the brake wheel cylinder 4 equates with pressure in the petrol storage tank 3, can not play brake action.
In order to obtain braking force, when the driver steps on brake pedal 1, valve core 23 overcomes the application force of return unit 32 and moves to the second place (namely in Fig. 6 linearity move to left side position) from right to left, in this second place, oil outlet 25 is communicated with oil inlet 24, and return opening 26 is closed with oil inlet 24 and oil outlet 25 or is not communicated with.
Because oil outlet 25 directly is communicated with oil inlet 24, and return opening 26 sealings, thereby high-pressure and hydraulic oil enters fluid control valve 2 by oil inlet 24, directly enters in the brake wheel cylinder 4 from oil outlet 25 then, thus make this brake wheel cylinder 4 its brake actions of performance.
As shown in Figure 6 the embodiment according to the present invention, also be provided with feedback oilhole 28 at valve core 23, a port 29 of this feedback oilhole 28 is positioned at the middle part of this valve core 23, when described valve core 23 is in primary importance, this port 29 is not communicated with oil inlet 24, when valve core 23 was in the second place, this port 29 was communicated with oil inlet 24, and the another port 30 of feedback oilhole 28 is positioned at the end that return unit 32 is installed of valve core 23.
Because the setting of feedback oilhole 28, as shown in Figure 6, when valve core 23 was in primary importance, the port 29 of feedback oilhole 28 was not communicated with oil inlet 24, thereby high-pressure and hydraulic oil can not enter in this feedback oilhole 28; And when valve core 23 arrived the second place, port 29 was communicated with oil inlet 24, thereby high-pressure and hydraulic oil can enter in the feedback oilhole 28, and 30 outflows from the another port, thereby arrived the end that valve core 23 is equipped with return unit 32.
After valve core 23 reaches the described second place, also flow to the end that return unit 32 is installed of valve core 23 by feedback oilhole 30 from the high-pressure and hydraulic oil of high pressure fuel accumulator 54, drive valve core 23 and move to the 3rd position (meta between position, an above-mentioned left side and right position), in the 3rd position, oil inlet 24, oil outlet 25 and return opening 26 are all closed or are not communicated with.
Specifically, after valve core 23 arrives the second place (being described with orientation shown in Figure 6), valve core 23 in strained condition in axial direction is: be subjected to the application force left (elastic force that comprises elastic component) that brake pedal 1 applies through 31 pairs of valve cores 23 of elastic component, 32 pairs of valve cores 23 of return unit application force to the right, and flow into valve cores 23 through feedback oilhole 28 and the high-pressure and hydraulic oil of end of return unit 32 is installed to valve core 23 application force to the right.And in these application forces, along with the continuous right-hand end that flows into valve core 23 of high-pressure and hydraulic oil, this high-pressure and hydraulic oil constantly increases valve core 23 application force to the right, thereby valve core 23 is moved right, and the trend of compression elastic piece 31.
Therefore, along with the increase of high-pressure and hydraulic oil to valve core 23 application force to the right, valve core 23 moves right (elastic component that connects valve core 23 and brake pedal 1 is compressed), is in the state of equilibrium of axial direction up to valve core 23.At this moment, valve core 23 is in the 3rd position, and in the 3rd position, oil inlet 24, oil outlet 25 and return opening 26 are all closed or be not communicated with, and namely keeps sealing, thereby can keep the braking force in the brake wheel cylinder 4 constant.
By foregoing description as can be known, the state that valve core 23 is in the second place (position, a left side) is not to stablize constant state, but a transient state that in braking procedure, occurs.
Be operated the difference of degree according to brake pedal 1, brake wheel cylinder 4 can produce and keep braking force in various degree.For example, if brake pedal 1 is operated bigger stroke, then in the fluid control valve 2 valve core be in time period of the second place can be longer, the high-pressure and hydraulic oil that then enters in the brake wheel cylinder 4 is more, and pressure also can be higher, the braking force of generation also can be bigger.
If the driver does not need braking, then can loosen the brake 1, then valve core 23 can return to initial position again under the elastic reaction of return unit 32, namely gets back to primary importance (right position) again.
In embodiment as shown in Figure 1, four wheel cylinders of brake wheel cylinder 4 are fluid connection each other, thereby can utilize brake system that the wheel cylinder of four wheels is braked simultaneously.
According to embodiment as shown in Figure 4 of the present invention, described high pressure fuel accumulator 54 comprises first high pressure fuel accumulator 541 and second high pressure fuel accumulator 542; Described sensor 56 comprises first sensor 561 and second sensor 562; Described fluid control valve 2 comprises first fluid control valve 41 and second fluid control valve 42, the valve pocket of the valve pocket of this first fluid control valve 41 and second fluid control valve 42 cuts off mutually, and the valve core of the valve core of described first fluid control valve 41 and second fluid control valve 42 is connected and is synchronized with the movement; Described wheel cylinder 4 comprises left back wheel cylinder RL, right front wheel cylinder FR, left front wheel cylinder FL and right back wheel cylinder RR; Wherein, described Hydraulic Pump 52 is respectively to described first high pressure fuel accumulator 541 and second high pressure fuel accumulator, 542 supply hydraulic fluids, and described first sensor 561 and second sensor 562 detect the pressure of hydraulic oil in described first high pressure fuel accumulator 541 and second high pressure fuel accumulator 542 respectively; Described first high pressure fuel accumulator 541 and second high pressure fuel accumulator 542 are respectively by hydraulic tubing and described first fluid control valve and the second fluid control valve hydraulic communication, described first fluid control valve is by hydraulic tubing and described left back wheel cylinder RL and right front wheel cylinder FR hydraulic communication, and described second fluid control valve is by hydraulic tubing and described left front wheel cylinder FL and right back wheel cylinder RR hydraulic communication.
In the brake system of this embodiment, two high pressure fuel accumulators 541 and 542 and two fluid control valves 41 and 42 are arranged, wherein, first high pressure fuel accumulator 541 is by first fluid control valve, the 41 left back wheel cylinder RL of control and right front wheel cylinder FR, and second high pressure fuel accumulator 542 is by second fluid control valve, the 42 left front wheel cylinder FL of control and right back wheel cylinder RR.
In this embodiment, because two high pressure fuel accumulator storage high-pressure and hydraulic oil are arranged, thereby can store more high-pressure and hydraulic oil, thus can apply bigger hydraulic coupling to each wheel cylinder of brake wheel cylinder 4, obtain stronger braking force.
And, because the control of left back wheel cylinder RL and the right front wheel cylinder FR control with left front wheel cylinder FL and right back wheel cylinder RR is separated, thereby can apply bigger hydraulic coupling to each wheel cylinder, with the stronger braking force of acquisition.Certainly, also each brake wheel cylinder can be kept hydraulic communication, utilize the fluid control valve of two interlocks to supply high-pressure and hydraulic oil to each wheel cylinder of brake wheel cylinder 4 simultaneously.
In order when applying braking force, to make being consistent as much as possible of each brake wheel cylinder braking force, the valve pocket of the valve pocket of first fluid control valve 41 and second fluid control valve 42 cuts off mutually, and the valve core of the valve core of described first fluid control valve 41 and second fluid control valve 42 is connected and is synchronized with the movement.Because the valve pocket of first fluid control valve 41 keeps cutting off (namely not having hydraulic communication each other) with the valve pocket of second fluid control valve 42, thereby the high-pressure and hydraulic oil that enters the valve pocket of these two fluid control valves when braking respectively can not interfered mutually.And, the valve core of the valve core of first fluid control valve 41 and second fluid control valve 42 interconnects and keeps being synchronized with the movement, therefore, when braking, via the left back wheel cylinder RL of first fluid control valve, 41 controls and the braking force of right front wheel cylinder FR, be consistent substantially with the left front wheel cylinder FL and the right back wheel cylinder RR that control via second fluid control valve 42.
By keeping the conformability of four brake wheel cylinder braking forces of vehicle, can guarantee the equilibrium of vehicle braking force when emergency braking, prevent that vehicle from rollover occurring, spinning or unsettled dangerous situation.
The valve core of the valve core of first fluid control valve 41 and second fluid control valve 42 can be by multiple connection mode so that realize can (when the braking) same moved further.
For example, according to embodiment as shown in Figure 3, the valve core of the valve core of first fluid control valve 41 and second fluid control valve 42 is connected in brake pedal 1 in parallel.Specifically, the valve core of first fluid control valve 41 all is connected with common support 43 (being generally rigid body) with the valve core of second fluid control valve 42, and this common support 43 is connected with brake pedal 1 by elastic component again.Thereby when stepping on brake pedal 1, under the drive of common support 43, the valve core of the valve core of first fluid control valve 41 and second fluid control valve 42 can be realized being synchronized with the movement.
According to embodiment as shown in Figure 4, the valve core of first hydraulic brake valve 41 is linked in sequence (series connection) in brake pedal 1 with the valve core of second hydraulic brake valve 42.Specifically, the valve core of second fluid control valve 42 is connected with the valve core of first fluid control valve 41, and the valve core of this first fluid control valve 41 is connected with brake pedal 1 more then, can obtain two synchronization-moving technique effects of valve core equally.
First hydraulic brake valve 41 and second hydraulic brake valve, 42 these two kinds of connection modes are different on arrangement structure, but can and be selected according to different structural arrangement requirements in actual condition.
Under the situation with two high pressure fuel accumulators 541 and 542, as shown in Figure 2, can be at Hydraulic Pump 52 via a check valve 53 to these two high pressure fuel accumulator pump pressure hydraulic oil.And these two high pressure fuel accumulators also can be discharged to unnecessary hydraulic oil in the petrol storage tank 3 by a pressure-relief valve 55.But, in this case, there is connected relation between first high pressure fuel accumulator 541 and second high pressure fuel accumulator 542, therefore, there is reciprocal influence between these two high pressure fuel accumulators.
In order to cut off the influence between first high pressure fuel accumulator 541 and 542, in the preferred case, check valve 53 comprises first check valve 531 and second check valve 532, and this first check valve 531 is arranged in the hydraulic tubing between Hydraulic Pump 52 and first high pressure fuel accumulator 541; Second check valve 532 is arranged in the hydraulic tubing between Hydraulic Pump 52 and second high pressure fuel accumulator 542.Pressure-relief valve 55 comprises first pressure-relief valve 551 and second pressure-relief valve 552, this first pressure-relief valve 551 is arranged in the hydraulic tubing between first high pressure fuel accumulator 541 and the petrol storage tank 3, and second pressure-relief valve 552 is arranged in the hydraulic tubing between second high pressure fuel accumulator 542 and the petrol storage tank 3.
Therefore, in this embodiment, Hydraulic Pump 52 via first check valve 531 to first high pressure fuel accumulator, 541 supply hydraulic fluids, and Hydraulic Pump 52 via second check valve 532 to second high pressure fuel accumulator, 542 delivery hydraulic pressure oil.And, if the pressure of first high pressure fuel accumulator 541 is higher than described second predetermined value, then can the release via first pressure-relief valve 551, and if the pressure of second high pressure fuel accumulator 542 is higher than described second predetermined value, then can the release via second pressure-relief valve 552.
Therefore, utilize above-mentioned first check valve 531, second check valve 532, first pressure-relief valve 551 and second pressure-relief valve 552, first high pressure fuel accumulator 541 and second high pressure fuel accumulator 542 are not communicated with fully.Thereby if the defective of leaking appears in one of them high pressure fuel accumulator, then the pressure decline of the hydraulic oil that causes of this leakage can not pass to another high pressure fuel accumulator yet.For example, leak if produce in first high pressure fuel accumulator 541 (or the pipeline that directly is communicated with this first high pressure fuel accumulator 541), then the braking problem can appear in left back wheel cylinder RL and the right front wheel cylinder FR by these first high pressure fuel accumulator, 541 supply high-pressure and hydraulic oil, and can not influence by the left front wheel cylinder FL of second high pressure fuel accumulator, 542 supply high-pressure and hydraulic oil and the braking of right back wheel cylinder RR.Therefore, utilize the brake system of this embodiment, can obtain bigger safety, guarantee the normal operation of motor vehicle braking system.
Below according to Fig. 4, the operational process of the motor vehicle braking system of embodiment shown in Figure 4 is described.
In the vehicle operating process, first sensor 561 and second sensor 562 can detect the pressure of hydraulic oil in first high pressure fuel accumulator 541 and second high pressure fuel accumulator 542 in real time respectively, if the insufficient pressure of one of them (perhaps two) high pressure fuel accumulator, then under the control of controller (as ECU) the primer fluid press pump respectively via first check valve 531 and second check valve 532 to two high pressure fuel accumulator pump pressure hydraulic oil.If the pressure in the high pressure fuel accumulator is higher than second predetermined value, then can pass through first pressure-relief valve 551 and second pressure-relief valve 552 respectively to petrol storage tank 3 releases.Therefore, can keep the hydraulic oil in the first high pressure petrol storage tank 541 and the second high pressure petrol storage tank 542 to remain within the rational range of pressure, and there is not hydraulic communication between this first high pressure fuel accumulator 541 and second high pressure fuel accumulator 542, even if one of them leaks, can not influence another normal use yet, have higher reliability.
When needs are braked, the driver steps on brake pedal 1, then brake pedal 1 can make the same moved further of valve core of valve core and second fluid control valve 42 of first fluid control valve 41 simultaneously, therefore, first fluid control valve 41 allows to enter left back wheel cylinder RL and right front wheel cylinder FR from the high-pressure and hydraulic oil of first high pressure fuel accumulator 541, thereby produces braking at left rear wheel and off front wheel; Simultaneously, second fluid control valve 42 allows to enter left front wheel cylinder FL and right back wheel cylinder RR from the high-pressure and hydraulic oil of second high pressure fuel accumulator 542, thereby produces braking at the near front wheel and off hind wheel.
If the driver does not keep the braking distance of brake pedal 1, then can keep braking force constant during in the 3rd position when first fluid control valve 41 and second fluid control valve 42.
If driver's loosen the brake 1 then under the control of first fluid control valve 41 and second fluid control valve 42, does not allow high-pressure and hydraulic oil to enter in the described brake wheel cylinder, thereby can not produce braking force in each wheel.
In addition, as shown in Figure 5 the embodiment according to the present invention, be provided with the ABS/ESP module in the hydraulic tubing between first fluid control valve, second fluid control valve and the described brake wheel cylinder 4, by this ABS/ESP module left back wheel cylinder RL, right front wheel cylinder FR, left front wheel cylinder FL and right back wheel cylinder RR braked respectively individually.
More than the specific embodiment of the present invention is described in detail, but those of ordinary skill in the art should be understood that, the content that the present invention comprises is not limited thereto, and under the prerequisite that does not break away from essential scope of the present invention, can make various modifications, replacement and variation.
Claims (6)
1. motor vehicle braking system, this motor vehicle braking system comprises:
Brake pedal (1) is handled this brake pedal (1) so that described motor vehicle braking system applies braking force to the wheel of vehicle;
Fluid control valve (2), this fluid control valve (2) comprises the have valve pocket valve body (22) of (21) and the valve core (23) that can move in described valve pocket (21), described valve body (22) is provided with oil inlet (24), oil outlet (25) and return opening (26), described valve core (23) is positioned at the outer end of described valve body (22) and is connected with described brake pedal (1), driving by described brake pedal (1), described valve core (23) can move in described valve pocket (21), to control described oil inlet (24), the connected sum of oil outlet (25) and return opening (26) is closed;
Hydraulic efficiency power unit (5), this hydraulic efficiency power unit (5) comprise petrol storage tank (3), high pressure fuel accumulator (54) and the Hydraulic Pump (52) that is driven by motor (51), and wherein, described petrol storage tank (3) is communicated with by hydraulic tubing with described return opening (26); Described petrol storage tank (3), described Hydraulic Pump (52) are communicated with by hydraulic tubing with described high pressure fuel accumulator (54), and described Hydraulic Pump (52) is transported to the hydraulic oil in the described petrol storage tank (3) in the described high pressure fuel accumulator (54), be provided with check valve (53) in the hydraulic tubing between described Hydraulic Pump (52) and high pressure fuel accumulator (54), this check valve (53) only allows hydraulic oil to flow to described high pressure fuel accumulator (54) from described Hydraulic Pump (52), and described high pressure fuel accumulator (54) also is communicated with by hydraulic tubing with described oil inlet (24);
Brake wheel cylinder (4), this brake wheel cylinder (4) is communicated with by hydraulic tubing with described oil outlet (25);
Sensor (56), this sensor (56) is for detection of the pressure of hydraulic oil in the described high pressure fuel accumulator (54);
Controller (57), this controller (57) is electrically connected with described sensor (56) and motor (51), is used for controlling described motor (51) to the driving of Hydraulic Pump (52) according to the detected force value of described sensor (56);
One end of the valve core (23) of described fluid control valve (2) is connected with described brake pedal (1) by elastic component (31), the other end of described valve core (23) is provided with return unit (32), when brake pedal (1) when not being operated, this return unit (32) applies application force to described valve core (23), make this valve core (23) be positioned at primary importance, in described primary importance, described oil outlet (25) is communicated with return opening (26), and described oil inlet (24) separates with described oil outlet (25) and return opening (26);
When stepping on brake pedal (1), described valve core (23) moves to the second place, and in this second place, described oil outlet (25) is communicated with described oil inlet (24), and described return opening (26) separates with described oil inlet (24) and oil outlet (25);
Also be provided with feedback oilhole (28) at described valve core (23), a port (29) of this feedback oilhole (28) is positioned at the middle part of this valve core (23), when described valve core (23) when being in described primary importance, this port and described oil inlet (24) separate, when described valve core (23) when being in the described second place, this port is communicated with described oil inlet (24), and the another port (30) of described feedback oilhole (28) is positioned at the other end of described valve core (23)
After described valve core (23) reaches the described second place, also flow to the other end of described valve core (23) by described feedback oilhole (30) from the high-pressure and hydraulic oil of described high pressure fuel accumulator (54), drive described valve core (23) and move to the 3rd position, in the 3rd position, described oil inlet (24), oil outlet (25) and described return opening (26) separate mutually.
2. motor vehicle braking system according to claim 1, wherein, when the pressure of hydraulic oil is less than first predetermined value in described sensor (56) detects described high pressure fuel accumulator (54), described controller (57) starts described motor (51), drive described Hydraulic Pump (52) hydraulic oil in the described petrol storage tank (3) is pumped in the described high pressure fuel accumulator (54), described first predetermined value is the minimum pressure values of the required interior hydraulic oil of high pressure fuel accumulator (54) of described brake wheel cylinder (4); When the pressure of hydraulic oil equals second predetermined value in described sensor (56) detects described high pressure fuel accumulator (54), described controller (57) stops described motor (51), make described Hydraulic Pump (52) stop the hydraulic oil in the described petrol storage tank (3) is pumped in the described high pressure fuel accumulator (54), described second predetermined value is greater than described first predetermined value and be less than or equal to the maximum pressure value of the hydraulic oil that described high pressure fuel accumulator (54) can bear.
3. motor vehicle braking system according to claim 2, wherein, when described motor (51) continuous running after the schedule time, described controller (57) sends failure alarm signal, and the described schedule time is to instigate the pressure of the interior hydraulic oil of described high pressure fuel accumulator (54) to reach the required time of second predetermined value from first predetermined value.
4. motor vehicle braking system according to claim 3, wherein, be communicated with by the hydraulic tubing that is provided with pressure-relief valve (55) between described high pressure fuel accumulator (54) and the described petrol storage tank (3), only when the pressure of hydraulic oil in the described high pressure petrol storage tank (54) during greater than described second predetermined value, this pressure-relief valve (55) is opened and is allowed the hydraulic oil in the described high pressure petrol storage tank (54) to flow to described petrol storage tank (3).
5. motor vehicle braking system according to claim 4, wherein,
Described high pressure fuel accumulator (54) comprises first high pressure fuel accumulator (541) and second high pressure fuel accumulator (542);
Described sensor (56) comprises first sensor (561) and second sensor (562);
Described fluid control valve (2) comprises first fluid control valve (41) and second fluid control valve (42), the valve pocket of the valve pocket of this first fluid control valve (41) and second fluid control valve (42) cuts off mutually, and the valve core of the valve core of described first fluid control valve (41) and second fluid control valve (42) is connected and is synchronized with the movement;
Described wheel cylinder (4) comprises left back wheel cylinder (RL), right front wheel cylinder (FR), left front wheel cylinder (FL) and right back wheel cylinder (RR);
To described first high pressure fuel accumulator (541) and second high pressure fuel accumulator (542) supply hydraulic fluid, described first sensor (561) and second sensor (562) detect the pressure of described first high pressure fuel accumulator (541) and the interior hydraulic oil of second high pressure fuel accumulator (542) respectively to described Hydraulic Pump (52) respectively;
Described first high pressure fuel accumulator (541) and second high pressure fuel accumulator (542) are respectively by hydraulic tubing and described first fluid control valve and the second fluid control valve hydraulic communication, described first fluid control valve is by hydraulic tubing and described left back wheel cylinder (RL) and right front wheel cylinder (FR) hydraulic communication, and described second fluid control valve is by hydraulic tubing and described left front wheel cylinder (FL) and right back wheel cylinder (RR) hydraulic communication.
6. motor vehicle braking system according to claim 5, wherein, described check valve (53) comprises first check valve (531) and second check valve (532), and this first check valve (531) is arranged in the hydraulic tubing between described Hydraulic Pump (52) and described first high pressure fuel accumulator (541); Described second check valve (532) is arranged in the hydraulic tubing between described Hydraulic Pump (52) and described second high pressure fuel accumulator (542); Described pressure-relief valve (55) comprises first pressure-relief valve (551) and second pressure-relief valve (552), this first pressure-relief valve (551) is arranged in the hydraulic tubing between described first high pressure fuel accumulator (541) and the described petrol storage tank (3), and described second pressure-relief valve (552) is arranged in the hydraulic tubing between described second high pressure fuel accumulator (542) and the described petrol storage tank (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910136465 CN101879892B (en) | 2009-05-08 | 2009-05-08 | Vehicle braking system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910136465 CN101879892B (en) | 2009-05-08 | 2009-05-08 | Vehicle braking system |
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| CN101879892A CN101879892A (en) | 2010-11-10 |
| CN101879892B true CN101879892B (en) | 2013-10-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103786700B (en) * | 2014-03-05 | 2017-02-15 | 长沙职业技术学院 | Automobile braking system |
| DE102015201031B4 (en) | 2015-01-22 | 2022-03-31 | Volkswagen Ag | Electronic braking system for a braking system of a commercial vehicle and commercial vehicle |
| DE102015203782A1 (en) * | 2015-03-03 | 2016-09-08 | Robert Bosch Gmbh | Method and device for determining whether a fault condition exists in a motor vehicle or not |
| CN107628010A (en) * | 2017-09-01 | 2018-01-26 | 金勇� | Without power-assisted hydraulic control brake system |
| CN108087384A (en) * | 2017-12-25 | 2018-05-29 | 芜湖盛力科技股份有限公司 | A kind of hydraulic brake valve reliability test system and method |
| CN110847278B (en) * | 2019-11-28 | 2021-12-07 | 王玲芝 | Loader vibration damper |
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|---|---|---|---|---|
| US4869560A (en) * | 1987-05-29 | 1989-09-26 | Aisin Seiki Kabushiki Kaisha | Hydraulic braking system for a vehicle |
| EP0494660A1 (en) * | 1991-01-09 | 1992-07-15 | Honda Giken Kogyo Kabushiki Kaisha | Pressure source for pressure device |
| CN1631693A (en) * | 2005-01-19 | 2005-06-29 | 清华大学 | Series connection type brake system of hybrid power vehicle |
| CN1807164A (en) * | 2005-01-17 | 2006-07-26 | 本田技研工业株式会社 | Hydraulic brake device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4869560A (en) * | 1987-05-29 | 1989-09-26 | Aisin Seiki Kabushiki Kaisha | Hydraulic braking system for a vehicle |
| EP0494660A1 (en) * | 1991-01-09 | 1992-07-15 | Honda Giken Kogyo Kabushiki Kaisha | Pressure source for pressure device |
| CN1807164A (en) * | 2005-01-17 | 2006-07-26 | 本田技研工业株式会社 | Hydraulic brake device |
| CN1631693A (en) * | 2005-01-19 | 2005-06-29 | 清华大学 | Series connection type brake system of hybrid power vehicle |
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