CN106402207A - Hydraulic control system with quick effect and precise braking torque control and for hydraulic retarder - Google Patents
Hydraulic control system with quick effect and precise braking torque control and for hydraulic retarder Download PDFInfo
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- CN106402207A CN106402207A CN201610857105.8A CN201610857105A CN106402207A CN 106402207 A CN106402207 A CN 106402207A CN 201610857105 A CN201610857105 A CN 201610857105A CN 106402207 A CN106402207 A CN 106402207A
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- valve
- control
- oil
- connects
- retarder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
Abstract
The invention discloses a hydraulic control system with the quick effect and precise braking torque control and for a hydraulic retarder. The hydraulic control system comprises an oil pump (1), a starting valve (4), a heat exchanger (5), a liquid filling amount regulating valve (9) and an electronic control unit (ECU) (10). The starting valve (4) is composed of a two-position two-way slide valve (2) and a first pilot valve (3). The liquid filling amount regulating valve (9) is composed of a two-way inserting valve (8) and a second pilot valve (7). The starting valve is used for controlling a hydraulic retarder wheel chamber (6) for achieving the quick effect. The liquid filling amount regulating valve (9) is used for precisely controlling the generated braking torque. The heat exchanger (5) is connected with the input end and the output end of the hydraulic retarder wheel chamber for achieving heat dissipation. According to the hydraulic control system with the quick effect and precise braking torque control, the oil liquid can be controlled to be injected into the retarder wheel chamber quickly for achieving the quick effect of the braking torque, the output braking torque of the retarder can be controlled precisely according to the working conditions and the use requirements of vehicles, and it can be guaranteed that the hydraulic retarder has good heat dissipation.
Description
Technical field
The invention belongs to vehicle deceleration brake control art is and in particular to a kind of quick acting and braking moment is accurate
The Retarder hydraulic control system controlling.
Background technology
At present, conventional running brake on vehicle mostly is disk brake or drum brake, belongs to friction disk type
Brake apparatus.Vehicle under long descending section, urban transportation or load-carrying such as run at a low speed at the operating mode, frequently or for a long time using this
During class brake, a large amount of kinetic energy are changed into heat energy by brake, lead to friction element temperature too high, and coefficient of friction reduces, braking
Efficiency declines, that is, " the heat fading phenomenon " of braking ability occurs.Heat fading phenomenon leads to vehicle brake efficiency seriously to reduce, easily
Lead to major accident.
In order to solve the above problems, various countries launch respectively corresponding law ＆ policy regulation vehicle and must be provided with auxiliary braking dress
Put, mainly have the devices such as engine exhaust and brake, hydraulic braking, electric vortex buffering braking, hydrodynamic retarding braking.Wherein, fluid power
Retarder with its small volume, braking moment is big, the brake efficiency duration is long the advantages of, having as mechanical foundation brakes
Effect complemental brake system is widely used.It is arranged in system of vehicle transmission gear front or behind more Retarder, car can be made
Under operating mode of running at high speed, cooperation vehicle mechanical foundation brakes are effectively reduced or keep travel speed, mitigate mechanical main system
The abrasion of dynamic device is it is ensured that vehicle safety smoothly retarding braking.
Hydraulic control technology is to determine one of key technology of Retarder combination property.Retarder is braked to it
The control of moment relies primarily on hydraulic control system and is quickly and accurately filled with appropriate fluid in wheel chamber, and according to vehicle work
Condition precise control is realizing., because it has mechanical part, therefore there is knot in traditional mechanical hydraulic-pressure type hydraulic control system
The problem that structure is complicated, control response is slow, and control function is few, typically can only export a quantitation, and output accuracy is poor, because
This is gradually replaced by the electric-control system with electric-controlled hydraulic/pneumatic element as core at present.Further, since during Retarder work
Substantial amounts of heat can be produced, its hydraulic system also should be ensured that Retarder has good heat-sinking capability.
Content of the invention
In view of this, the invention provides the Retarder of a kind of achievable quick acting and braking moment precise control
Hydraulic control system.In Retarder uses, controllable fluid is quickly filled with slow device wheel chamber, to realize braking moment
Quick acting, and can be according to vehicle working condition and use demand, precise control retarder exports braking moment, and can ensure liquid
Power retarder has good heat-sinking capability.
In order to solve above-mentioned technical problem, the present invention is realized in：
The Retarder hydraulic control system of a kind of quick acting and braking moment precise control, including oil pump, onset
Valve, heat exchanger, topping up adjustable valve and electronic control unit ECU；Described onset valve is by bi-bit bi-pass guiding valve and the first pilot valve
Composition, topping up adjustable valve is made up of two-way plug-in valve and the second pilot valve；Oil pump provides system fluid delivery outlet and controls oil
Liquid delivery outlet；
The system fluid delivery outlet of oil pump connects a mouth of bi-bit bi-pass guiding valve, and the b mouth of bi-bit bi-pass guiding valve connects fluid power and delays
The oil-in in fast device wheel chamber, forms topping up branch road；
First oil-out in hydrodynamic retarding device wheel chamber connects heat exchanger entrance, and heat exchanger exit accesses described topping up branch road,
And be located between bi-bit bi-pass guiding valve and hydrodynamic retarding device wheel chamber, form circulation cooling branch road；
Second oil-out in hydrodynamic retarding device wheel chamber connects two-way plug-in valve oil-in a1, and two-way plug-in valve oil-out b1 is even
Connect two-way plug-in valve open type oil tank, form filling amount and adjust branch road；
The fluid delivery outlet that controls of oil pump passes through the control oil port that the first pilot valve connects bi-bit bi-pass guiding valve, and passes through
Second pilot valve connects the control oil port of two-way plug-in valve, is formed and controls oily branch road；
ECU connects the control signal of two pilot valves, forms automatically controlled branch road.
Preferably, described first pilot valve is solenoid directional control valve；The A mouth of solenoid directional control valve connects the control of bi-bit bi-pass guiding valve
Liquefaction port, P mouth connects the control fluid delivery outlet of oil pump, and oil return inlet T connects solenoid directional control valve open type oil tank, Electromagnetic Control end
Connect ECU.
Preferably, described second pilot valve is proportional pressure-reducing valve；The oil-out U1 of proportional pressure-reducing valve connects two-way plug-in valve
Control oil port, oil inlet P 1 connect oil pump control fluid delivery outlet, oil return inlet T 1 connect proportional pressure-reducing valve open type oil tank,
Electromagnetic Control end connects ECU.
Preferably, in described oil pump, coarse filter entrance is connected with open type oil tank, and coarse filter outlet connects control oil pump and enters
Mouthful；Control oil pump outlet connects the first fine filter entrance；First fine filter outlet is as control fluid delivery outlet；
Coarse filter exports further connection system oil pump inlet；System fuel pump outlet connects the second fine filter entrance；Second
Fine filter exports as system fluid delivery outlet.
Preferably, described oil pump further includes two safety overflow valves；First safety overflow valve is connected to the first essence
Between filter outlets and the entrance of coarse filter；Second safety overflow valve be connected to second fine filter outlet and coarse filter entrance it
Between.
Preferably, the pipeline between the second safety overflow valve and the entrance of coarse filter is installed respirator.
Preferably, described ECU, according to the action situation of the brake pedal of external feedback and vehicle's current condition, obtains fluid power
The current target braking force square in slow device wheel chamber；Closed loop control algorithm is determined with according to target braking force square and obtains hydrodynamic retarding
Device working condition, is divided into four operating modes：
When required braking moment is 0, it is in the operating mode that do not work, ECU controls to the first pilot valve and the second pilot valve
Signal, two pilot valves are closed, and do not have braking moment to export；
When required braking moment is when 0 is changed into non-zero, it is in onset operating mode, ECU gives the first pilot valve commutation signal, onset
Valve rapid-onset, system fluid enters in hydrodynamic retarding device wheel chamber, produces braking moment；Now, ECU exports to the second pilot valve
High control electric current is so that the second pilot valve exports and act on two-way plug-in valve to control the control oil pressure of oily port is higher than that two-way is inserted
Oil pressure at dress valve oil-in a1 is so that two-way plug-in valve valve element is closed；
Steady working condition is entered, ECU, according to the change of target braking force square, is controlled to the second pilot valve output after onset operating mode
Signal processed, the output oil pressure of adjustment the second pilot valve, and then adjust the valve element aperture of two-way plug-in valve, thus adjusting hydrodynamic retarding
The filling amount in device wheel chamber portion makes it rapidly close to described target braking force square；
When Retarder needs to quit work, ECU stops to the first pilot valve and the second pilot valve output control letter
Number, stop output braking moment.
Beneficial effect：
(1) present configuration is simple, by the use of a small amount of device, reaches quick acting and braking moment is accurately imitated
Really.
(2) heat exchanger exit of the present invention connects onset valve outlet port, compared with connecting onset valve inlet, the connection of the present invention
Mode, more simply, makes full use of the feature that hydrodynamic retarding device wheel chamber outlet oil pressure is higher than import oil pressure, the first of wheel chamber is gone out
Hydraulic fluid port is passed through heat exchanger and is connected with wheel chamber oil-in, merely with a bi-bit bi-pass guiding valve can achieve retarder quickly oil-filled and
The control of circulation cooling, valve system overall structure is simplified.
(3) present invention adopts onset valve to match with topping up adjustable valve to realize Retarder quick acting and braking
Moment precise control.Directly Retarder import and export fluid flow is controlled meeting using existing magnetic valve
The demand to low pressure drop, big flow for the retarder charge and discharge oil system.Therefore, using two of solenoid directional control valve pilot control big orifice
Two-way guiding valve, switch control rule fast response time, controllable big flow fluid quickly enters in slow device wheel chamber, and Retarder can
Quick acting；Using can continuous accurate output control oil pressure proportional pressure-reducing valve pilot control two-way plug-in valve, continuously adjust control
High precision processed, can realize accurate to slow device wheel chamber second outlet fluid flow according to input proportional pressure-relief valve control signal
Adjust, and then realize the precise control to slow device wheel chamber filling amount and output braking moment.
Brief description
Fig. 1 is Retarder integrated hydraulic control principle drawing.
Wherein, 1- oil pump, 2- bi-bit bi-pass guiding valve, 3- solenoid directional control valve (the first pilot valve), 4- onset valve, 5- heat exchange
Device, 6- hydrodynamic retarding device wheel chamber, 7- proportional pressure-reducing valve (the second pilot valve), 8- two-way plug-in valve, 9- topping up adjustable valve, 10-
Electronic control unit ECU, 11- hydrodynamic retarding device wheel chamber oil-in, first oil-out in 12- hydrodynamic retarding device wheel chamber, 13- fluid power
Second oil-out in slow device wheel chamber, 14- topping up three-way connection, 15- solenoid directional control valve open type oil tank, 16- two-way plug-in valve is opened
Formula fuel tank, 17- proportional pressure-reducing valve open type oil tank, 18- system oil pump safety overflow valve, 19- controls fluid output three-way connection (control
Liquefaction liquid delivery outlet), 20- controls fluid output three-way connection, 21- first fine filter, 22- control oil pump, and 23- control oil pump is pacified
Full overflow valve, 24- coarse filter, 25- open type oil tank, 26- respirator, 27- system oil pump, 28- second fine filter, 29- system oil
Liquid output three-way connection (system fluid delivery outlet).
Specific embodiment
Develop simultaneously embodiment below in conjunction with the accompanying drawings, describes the present invention.
The invention provides the Retarder hydraulic control system of a kind of quick acting and braking moment precise control, its
It is electronic control unit including oil pump 1, onset valve 4, heat exchanger 5, topping up adjustable valve 9 and hydraulic control system electric controller
(ECU, Electronic Control Unit) 10.
Oil pump 1 provides system fluid for retarder hydraulic control system and controls fluid, and wherein system fluid is retarder
The driving medium of wheel chamber internal flow, controls fluid to be used for hydraulic pilot valve and controls use.Oil pump 1 mainly includes：Open type oil tank
25th, respirator 26, coarse filter 24, system oil pump 27 and its second fine filter 28, system oil pump safety overflow valve 18, system fluid
Output three-way connection 29, control oil pump 22 and its first fine filter 21, control oil pump safety overflow valve 23, control fluid output three
Pass joint 20 and respective line.
Onset valve 4 is quickly filled with hydrodynamic retarding device wheel chamber 6 for control system fluid by topping up branch road, that is, control it fast
Fast onset, when retarder needs to quit work, onset valve 4 can cut out topping up branch road.Onset valve 4 mainly includes：Bi-bit bi-pass
Guiding valve 2, the solenoid directional control valve 3 playing its leading role, solenoid directional control valve open type oil tank 15 (open type oil tank 25 can be connected) and
Respective line.
Topping up adjustable valve 9 is used for precise control hydrodynamic retarding device wheel chamber 6 internal-filling liquid amount, in addition when retarder needs to stop
During work, topping up adjustable valve 9 fully opens, you can to play the effect quickly draining wheel chamber inner fluid.Main inclusion：Two-way
Inserted valve 8, the proportional pressure-reducing valve 7 playing its leading role, two-way plug-in valve open type oil tank 16 (open type oil tank 25 can be connected), ratio
Example pressure-reducing valve open type oil tank 17 (open type oil tank 25 can be connected) and respective line.
One oil-in 11 and two oil-outs are distributed with hydrodynamic retarding device wheel chamber 6, respectively oil-out 12 with fuel-displaced
Mouth 13, i.e. a road oil-feed (topping up branch road), two-way fuel-displaced (circulation cooling branch road adjusts branch road with topping up).System fluid can pass through
Topping up branch road flows into slow device wheel chamber 6 oil-in 11；Heat exchanger 5 is provided with circulation cooling branch road it is ensured that by slow device wheel chamber
The system fluid heat that oil-out 12 flows out can be scattered and disappeared effectively, and the fluid after cooling can pass through topping up three-way connection 14
Flow into topping up branch road；The fluid flowing out from oil-out 13 flows into filling amount and adjusts branch road, reaches topping up adjustable valve, to be filled
Liquid measure precise control.
ECU10 is used for controlling two pilot valves：Solenoid directional control valve 3 and the working condition of proportional pressure-reducing valve 7.In addition, controlling
The control fluid of oil pump output can be respectively supplied to two pilot valves by controlling fluid to export three-way connection 19.
In order to realize above-mentioned functions, between each assembly by following connected mode constitute topping up branch road, circulation cooling branch road,
Filling amount adjusts branch road, controls oily branch road, system oil branch road, auxiliary branch and automatically controlled branch road.Specifically, annexation is：
1) topping up branch road：Oil pump 1 connection system fluid exports three-way connection 29, and system fluid output three-way connection 29 is wherein
One interface is as system fluid delivery outlet.Wherein, system fluid exports the system fluid delivery outlet connection two of three-way connection 29
The import a of position two-way guiding valve 2；The outlet b of bi-bit bi-pass guiding valve connects Retarder wheel chamber 6 by topping up three-way connection 14 and enters
Hydraulic fluid port 11；
2) circulation cooling branch road：First oil-out 12 in hydrodynamic retarding device wheel chamber 6 connects heat exchanger 5 entrance；Heat exchanger 5 goes out
Mouth connects topping up three-way connection 14, that is, be connected into topping up branch road；
3) filling amount adjusts branch road：Second oil-out 13 in hydrodynamic retarding device wheel chamber 6 connects two-way plug-in valve 8 oil-in
a1；Two-way plug-in valve 8 oil-out b1 connects two-way plug-in valve open type oil tank 16；
4) control oily branch road：Coarse filter 24 entrance is connected with open type oil tank 25, and coarse filter 24 outlet connects control oil pump 22
Entrance；Control oil pump 22 outlet connects the first fine filter 21 entrance；First fine filter 21 outlet exports threeway by controlling fluid
Joint 20 is connected the P mouth of solenoid directional control valve 3 and the oil inlet P 1 of proportional pressure-reducing valve 7 with three-way connection 19；The A of solenoid directional control valve 3
Mouth connects the control oil port of bi-bit bi-pass guiding valve 2；The oil return inlet T of solenoid directional control valve 3 connects solenoid directional control valve open type oil tank 15；
The oil-out U1 of proportional pressure-reducing valve 7 connects the control oil port of two-way plug-in valve 8, and the oil return inlet T 1 of proportional pressure-reducing valve 7 connects ratio
Example pressure-reducing valve open type oil tank 17.
5) system oil branch road：Coarse filter 24 exports further connection system oil pump 27 entrance；System oil pump 27 outlet connects
Second fine filter 28 entrance；Second fine filter 28 outlet exports three-way connection 29 by system fluid and connects bi-bit bi-pass guiding valve 2
Entrance a；
6) auxiliary branch：Control fluid output three-way connection 20 to connect control oil pump safety overflow valve 23 entrance, control oil
Pump safety overflow valve 23 outlet connects open type oil tank 25.Three-way connection 29 connection system oil pump safety overflow valve 18 entrance, system
Oil pump safety overflow valve 18 outlet connects open type oil tank 25.Between system oil pump safety overflow valve 18 and the entrance of coarse filter 24
Respirator 26 is installed on pipeline.
7) automatically controlled branch road：ECU control circuit connects the control signal of solenoid directional control valve and proportional pressure-reducing valve.
ECU 10 is controlled to HYDRAULIC CONTROL SYSTEM valve system according to internal control strategy.Driver can be according to vehicle condition control
Retarder control pedal, ECU 10 can count in real time according to operator brake pedal operational circumstances and vehicle's current condition
Calculate the target braking force square needed for Current vehicle, ECU 10 can be by the sensor real-time monitoring vehicle braking of arrangement on vehicle
Speed and deceleration, and then be back-calculated to obtain hydrodynamic retarding device wheel chamber 6 and currently export braking moment, controlled based on Intelligent closed-loop
Algorithm is controlled to retarder topping up adjustable valve in real time, adjusts hydrodynamic retarding device wheel chamber 6 internal filled liquid situation, right to realize
The continuous regulation and control of output braking moment.
Driver manipulates brake pedal, and ECU10 determines the target braking of Retarder 6 according to brake pedal action situation
Moment.The different Retarder working condition of different braking moment correspondences, specifically can be divided into following four operating mode：Non- work
Make operating mode, onset operating mode, steady working condition and close operating mode.
1) do not work operating mode
When Retarder does not work (required braking moment is 0), ECU10 does not give solenoid directional control valve 3 and ratio decompression
Valve 7 control signal, two pilot valves are closed, and the fluid that controls from control oil pump is blocked in P mouth and the valve of solenoid directional control valve 3
At 7P1 mouth, do not control oil pressure to export to bi-bit bi-pass guiding valve 2 right-hand member control chamber and two-way plug-in valve 8 upper end control chamber, come
It is blocked at bi-bit bi-pass guiding valve 2 import a from the system fluid of oil pump 1, it cannot enter slow device wheel by topping up branch road
In chamber 6, braking moment is not now had to export.
2) onset operating mode
When Retarder needs work (required braking moment is not 0), ECU10 to solenoid directional control valve 3 commutation signal,
Solenoid directional control valve 3 rapid-onset, the fluid that controls from control oil pump flows to solenoid directional control valve 3 by the P mouth of solenoid directional control valve 3
A mouth, and then act on bi-bit bi-pass guiding valve 2 right-hand member control chamber, control fluid can compress rapidly bi-bit bi-pass guiding valve 2 left end and return
Position spring, makes the valve element of bi-bit bi-pass guiding valve 2 move to the left and fully opens, be i.e. onset valve 4 quick acting, from oil pump 1
System fluid can enter in hydrodynamic retarding device wheel chamber 6 quickly through import and export a, b of bi-bit bi-pass guiding valve 2 and topping up branch road,
Filling amount rapid increase in hydrodynamic retarding device wheel chamber 6, produces braking moment.
Meanwhile, for ensureing retarder braking moment quick acting, now topping up adjustable valve 9 should be at closing shape
State.ECU10 exports high control electric current (500mA) so as to valve element aperture is larger to proportional pressure-reducing valve 7, from the control of control oil pump
Liquefaction liquor stream enters the P1 mouth of proportional pressure-reducing valve 7, and passing ratio pressure-reducing valve 7 flows to its output end U1, due to now control electric current relatively
Greatly, U1 end output control oil pressure is also larger, and larger proportional pressure-reducing valve 7 output control oil pressure acts on two-way plug-in valve 8 upper end
Control chamber.And part fluid can pass through the effect of rotating wheel chamber centrifugal force in hydrodynamic retarding device wheel chamber 6, by hydrodynamic retarding device wheel
The oil-out 13 in chamber 6 and filling amount adjust branch road and flow to two-way plug-in valve 8 import a1, but two-way plug-in valve 8 upper end control chamber oil
Pressure is closed far above oil pressure at two-way plug-in valve 8 import a1, therefore two-way plug-in valve 8 valve element, does not have fluid can insert by two-way
Dress valve 8 outlet b1 flows out to two-way plug-in valve open type oil tank 16.
Additionally, also playing the role of part fluid in hydrodynamic retarding device wheel chamber 6 can pass through rotating wheel chamber centrifugal force, by fuel-displaced
Mouth 12 inflow circulation cooling branch roads flow to heat exchanger 5, carry out cooling radiating, then flow at three-way connection 14.Due to two two
At logical guiding valve 2 outlet b, oil pressure is high, and hydrodynamic retarding device wheel chamber 6 oil-in 11 low oil pressure, therefore from the fluid on circulation cooling road
Topping up branch road is directly flowed back to by three-way connection 14, enters the oil-in 11 in hydrodynamic retarding device wheel chamber 6, and complete circulation cooling mistake
Journey.
3) steady working condition
After retarder onset, it usually needs keep certain output braking moment, or certain speed is maintained to be held
Continuous braking procedure, now hydrodynamic retarding device wheel chamber 6 should be according to applying working condition, quickly and accurately regulation internal filled liquid amount.?
Under this operating mode, onset valve 4 keeps it turned on, and topping up branch road and circulation cooling branch road keep unimpeded.ECU10 is according to driver's system
Dynamic intention, calculates retarder target braking force square, and Real-time Collection car load speed and vehicle deceleration signal, goes out in prediction on such basis
Retarder exports braking moment, and passes through closed loop control algorithm output control electric current, drives proportional pressure-reducing valve 7 to adjust its valve element and opens
Degree is to adjust the pressure output control of proportional pressure-reducing valve 7, and then the valve element aperture of adjustment two-way plug-in valve 8 and then quickly accurate
Ground dynamic regulation U1 end output oil pressure, the control fluid that during regulation, proportional pressure-reducing valve 7 is discharged can be discharged to by exporting T1
Open type oil tank 17.And the control oil pressure exporting two-way plug-in valve 8 upper end control chamber can be with two-way plug-in valve 8 import a1 system oil
Pressure interacts, and adjusts two-way plug-in valve 8 valve element aperture, and controls filling amount to adjust branch road output flow, and then adjusts fluid power
Slow device wheel chamber 6 internal filled liquid amount, reaches the target of real-time precise control braking moment, meets the braking need of driver in real time
Ask.
4) close operating mode
When Retarder needs to quit work, the internal fluid in hydrodynamic retarding device wheel chamber 6 should quickly be discharged, braking moment
Rapid reduction.ECU10 stops to solenoid directional control valve 3 output control signal, and bi-bit bi-pass guiding valve 3 is fast in the presence of return spring
Speed is closed, that is, carry out the fluid that controls in control oil pump and block at P mouth it is impossible to flow into the hydraulic control end of bi-bit bi-pass guiding valve 2
Continue to keep bi-bit bi-pass guiding valve 2 to open, in addition the fluid with certain pressure of bi-bit bi-pass guiding valve 2 right-hand member control chamber storage
The oil-out T of solenoid directional control valve 3 can be flowed to by the A mouth of solenoid directional control valve valve 3, and then flow to open type oil tank 15.Now two
Two-way guiding valve 2 quick closedown in the presence of left end return spring, the system fluid from system oil pump is blocked in two two
The a mouth of logical guiding valve 2, i.e. topping up branch road termination work, stop oil-filled for slow device wheel chamber.
Additionally, ECU10 stops to proportional pressure-reducing valve 7 output control signal, proportional pressure-reducing valve 7 valve element return spring internally
In the presence of completely close, P1 end controls fluid to cannot be introduced into output end U1, in addition two-way plug-in valve 8 upper end control chamber storage
The fluid with certain pressure can be discharged by the outspoken speed of T1, that is, two-way plug-in valve 8 upper end control chamber oil pressure is reduced to 0, and
The fluid with certain pressure from hydrodynamic retarding device wheel chamber 6 oil-out 13 adjusts branch road by filling amount, flows to two-way and inserts
Dress valve 8 import a1, valve element is fully opened, the fluid in hydrodynamic retarding device wheel chamber 6 can export quickly through valve two-way plug-in valve 8
B1 flows out, and flows to open type oil tank 16, quickly drains hydrodynamic retarding device wheel chamber 6 inner fluid, retarder braking moment reduces rapidly, liquid
Power retarder quits work.
In sum, these are only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.
All any modification, equivalent substitution and improvement within the spirit and principles in the present invention, made etc., should be included in the present invention's
Within protection domain.
Claims (7)
1. the Retarder hydraulic control system of a kind of quick acting and braking moment precise control is it is characterised in that include
Oil pump (1), onset valve (4), heat exchanger (5), topping up adjustable valve (9) and electronic control unit ECU (10)；Described onset valve
(4) it is made up of bi-bit bi-pass guiding valve (2) and the first pilot valve (3), topping up adjustable valve (9) is by two-way plug-in valve (8) and second
Pilot valve (7) forms；Oil pump (1) provides system fluid delivery outlet (29) and controls fluid delivery outlet (19)；
System fluid delivery outlet (29) of oil pump (1) connects a mouth of bi-bit bi-pass guiding valve (2), the b mouth of bi-bit bi-pass guiding valve (2)
Connect the oil-in (11) in Retarder wheel chamber (6), form topping up branch road；
First oil-out (12) in hydrodynamic retarding device wheel chamber (6) connects heat exchanger (5) entrance, and heat exchanger (5) outlet accesses described
Topping up branch road, and be located between bi-bit bi-pass guiding valve (2) and hydrodynamic retarding device wheel chamber (6), form circulation cooling branch road；
Second oil-out (13) in hydrodynamic retarding device wheel chamber (6) connects two-way plug-in valve (8) oil-in a1, two-way plug-in valve (8)
Oil-out b1 connects two-way plug-in valve open type oil tank (16), forms filling amount and adjusts branch road；
The control oil port that the first pilot valve connects bi-bit bi-pass guiding valve (2) is passed through in control fluid delivery outlet (19) of oil pump (1),
And by the control oil port of the second pilot valve (7) connection two-way plug-in valve (8), formed and control oily branch road；
ECU (10) connects the control signal of two pilot valves, forms automatically controlled branch road.
2. Retarder hydraulic control system as claimed in claim 1 is it is characterised in that described first pilot valve (3) is
Solenoid directional control valve；The A mouth of solenoid directional control valve (3) connects the control oil port of bi-bit bi-pass guiding valve (2), and P mouth connects oil pump (1)
Control fluid delivery outlet (19), oil return inlet T connects solenoid directional control valve open type oil tank (15), Electromagnetic Control end connects ECU (10).
3. Retarder hydraulic control system as claimed in claim 1 is it is characterised in that described second pilot valve (7) is
Proportional pressure-reducing valve；The oil-out U1 of proportional pressure-reducing valve (7) connects the control oil port of two-way plug-in valve (8), and oil inlet P 1 connects
Control fluid delivery outlet (19) of oil pump (1), oil return inlet T 1 connects proportional pressure-reducing valve open type oil tank (17), and Electromagnetic Control end connects
ECU(10).
4. Retarder hydraulic control system as claimed in claim 1 is it is characterised in that in described oil pump (1), coarse filter
(24) entrance is connected with open type oil tank (25), and coarse filter (24) outlet connects control oil pump (22) entrance；Control oil pump (22) goes out
Mouth connects the first fine filter (21) entrance；First fine filter (21) outlet is as control fluid delivery outlet；
Coarse filter (24) exports further connection system oil pump (27) entrance；System oil pump (27) outlet connects the second fine filter
(28) entrance；Second fine filter (28) exports as system fluid delivery outlet.
5. Retarder hydraulic control system as claimed in claim 4 it is characterised in that in described oil pump (1) further
Including two safety overflow valves (23,18)；First safety overflow valve (23) is connected to the first fine filter (21) outlet and coarse filter
(24) between entrance；Second safety overflow valve (18) be connected to the second fine filter (28) outlet and coarse filter (24) entrance it
Between.
6. Retarder hydraulic control system as claimed in claim 5 it is characterised in that the second safety overflow valve (18) with
Respirator (26) is installed on the pipeline between the entrance of coarse filter (24).
7. Retarder hydraulic control system as claimed in claim 1 is it is characterised in that described ECU is according to external feedback
The action situation of brake pedal and vehicle's current condition, obtain hydrodynamic retarding device wheel chamber (6) current target braking force square；Root
Determine with closed loop control algorithm according to target braking force square and obtain Retarder working condition, be divided into four operating modes：
When required braking moment is 0, it is in the operating mode that do not work, ECU (10) does not give the first pilot valve (3) and the second pilot valve
(7) control signal, two pilot valves are closed, and do not have braking moment to export；
When required braking moment is when 0 is changed into non-zero, it is in onset operating mode, ECU (10) gives the first pilot valve (3) commutation signal, rise
Effect valve (4) rapid-onset, system fluid enters in hydrodynamic retarding device wheel chamber (6), produces braking moment；Now, ECU (10) is to
Two pilot valves (7) export high control electric current so that the second pilot valve (7) exports and acts on two-way plug-in valve (8) controls oily end
The control oil pressure of mouth is higher than the oil pressure at two-way plug-in valve (8) oil-in a1 so that two-way plug-in valve (8) valve element is closed；
Steady working condition is entered, ECU (10) is according to the change of target braking force square, defeated to the second pilot valve (7) after onset operating mode
Go out control signal, the output oil pressure of adjustment the second pilot valve (7), and then adjust the valve element aperture of two-way plug-in valve (8), thus adjusting
The internal filling amount of section hydrodynamic retarding device wheel chamber (6) makes it rapidly close to described target braking force square；
When Retarder needs to quit work, ECU (10) stops to the first pilot valve (3) and the second pilot valve (7) output
Control signal, stops output braking moment.
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| CN201610857105.8A CN106402207B (en) | 2016-09-27 | 2016-09-27 | The Retarder hydraulic control system that quick acting and braking moment accurately control |
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| CN201610857105.8A CN106402207B (en) | 2016-09-27 | 2016-09-27 | The Retarder hydraulic control system that quick acting and braking moment accurately control |
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| CN108545070A (en) * | 2018-04-19 | 2018-09-18 | 合肥工业大学 | A kind of hydrodynamic retarding braking system that can effectively control retarder brake torque |
| CN110435423A (en) * | 2019-06-28 | 2019-11-12 | 中冶宝钢技术服务有限公司 | A kind of method for control speed and device for hydrostatic driving vehicle descending |
| CN111927905A (en) * | 2020-08-27 | 2020-11-13 | 阜新德尔汽车部件股份有限公司 | Hydraulic retarder with controllable internal pressure of oil tank |
| CN114060493A (en) * | 2021-11-16 | 2022-02-18 | 贵州凯星液力传动机械有限公司 | Hydraulic control system of retarder |
| CN114352697A (en) * | 2021-12-21 | 2022-04-15 | 西安法士特汽车传动有限公司 | Torque converter and retarder integrated control hydraulic system and method |
| CN114992260A (en) * | 2022-05-13 | 2022-09-02 | 宁波市北仑旭泰汽车零部件有限公司 | Pump type retarder for vehicle retarding braking system |
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| CN114352697A (en) * | 2021-12-21 | 2022-04-15 | 西安法士特汽车传动有限公司 | Torque converter and retarder integrated control hydraulic system and method |
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