CN202966414U - Flow variable electronically-controlled hydraulic steering system - Google Patents
Flow variable electronically-controlled hydraulic steering system Download PDFInfo
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- CN202966414U CN202966414U CN 201220496119 CN201220496119U CN202966414U CN 202966414 U CN202966414 U CN 202966414U CN 201220496119 CN201220496119 CN 201220496119 CN 201220496119 U CN201220496119 U CN 201220496119U CN 202966414 U CN202966414 U CN 202966414U
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Abstract
The utility model discloses a combined electromagnetic valve type flow variable electronically-controlled hydraulic steering system and a control device thereof. The steering system comprises a steering oil pump, a combined electromagnetic valve unit, a steering control valve, a steering power cylinder, the control device, an oil tank, a vehicle speed sensor, a steering angle speed sensor, an oil outlet pipeline and a return oil pipeline, wherein the combined electromagnetic valve unit is formed by two electromagnetic valves which are connected in parallel in different drift diameters; the control device comprises a frequent voltage conversion chip, a level comparison module, a logical operation module, an electromagnetic valve driving module, a power source undervoltage protection module and an overcurrent protection module; and the control device can control the opening and closing of the electromagnetic valves in a combined way via sensor signals. According to the utility model, the problems of portability and safety for steering during high-speed emergent large steering are solved, so that a driver has better power assisting feeling. The combined electromagnetic valve type flow variable electronically-controlled hydraulic steering system is simple in circuit, fast in frequency response, large in output driving current, high in hydraulic control precision, and economical and applicable, and has strong universality.
Description
Technical field
The utility model relates to the electric control hydraulic power-assisted steering field, is specifically related to a kind ofly can change by-pass collar and the control setup thereof that enters flow stream pressure and flow in the power steering rotary valve, is applicable to the commercial vehicle/comm..vehicles such as motor omnibus, goods carrying vehicle.
Background technology
At present, in the commercial vehicle/comm..vehicle field, widespread use is hydraulic power-assist steering system, only there is fixing hand force property, when the automobile low speed driving, steering wheel operating has portability preferably, when the speed of a motor vehicle faster the time, the power steerig pump rotating speed also rises, cause the flow of hydraulic oil to increase, produce larger power-assisted, make rotating of steering wheel too light, easily lose road feel, produce the problem of automobile " unstable ", reduced the safety performance that commercial vehicle/comm..vehicle is run at high speed, also be unfavorable for the requirement of vehicle energy saving.Because the conventional hydraulic servo steering system can't effectively solve the contradiction that turns to " gently " and " spirit ", and the problem that mutually restricts of steering effort and road feel, so people propose Electro-Hydraulic Power Steering System and control the flow that enters convertible valve, to obtain good power-assisted feel.This system can be divided into three kinds of major control modes such as electromagnetic valve flow control formula, stepping motor drive control valve flow control formula, motor direct-drive oil pump flow control formula according to the volume control device difference at present.
In existing scheme, the restriction size that adopts stepping motor to regulate bypass disc in china national practical new-type patent 200320118460.1, enter into the hydraulic fluid flow rate of steering control valve with control.When can solving to a certain extent automobile high-speed and turn to, this improvement project loses the problem of road feel, but this form structure complexity, cost is higher, wayward; In china national practical new-type patent 200820227155.9, adopted electromagnetic proportional valve to regulate the restriction size of bypass disc, thereby control the flow of hydraulic oil, but this scheme is higher to the accuracy requirement of electromagnetic proportional valve itself, also comparatively harsh to the requirement of controller, and needle-valve often bears in actual use incessantly high pressure and unsettled phenomenon occurs opening; In china national practical new-type patent 200720034596.2, adopt DC machine directly to drive oil pump, indirectly control Hydraulic Pump flow and pressure by the size of controlling power line voltage and electric current, this structure has increased motor and other bindiny mechanisms on the basis of original power steering, structure is more complicated, and is also difficult point to the control of DC machine.
Above-mentioned these scheme ubiquities are wayward, and cost of product is higher, and the deficiencies such as complex structure are difficult to obtain the good power-assisted feel of chaufeur needs.
The utility model content
The purpose of this utility model is for overcoming the deficiencies in the prior art, provides a kind of and keeping on original hydraulic power-assist steering system basis, setting up a set of multifunctional electromagnetic valves unit as bleed off circuit, can realize that by accurate control the bypass oil mass is multistage adjustable, the Electro-Hydraulic Power Steering System that assist characteristic is better.Its technical scheme is:
A kind of variable-flow electric-controlled hydraulic steering swivel system, it is characterized in that: comprise power steerig pump 1, multifunctional electromagnetic valves unit 3, steering control valve 5, power cylinder 6, car speed sensor 7, deflection angle speed sensor 4, control setup 8, oil tank 10, wherein multifunctional electromagnetic valves unit 3 one ends are connected with the fuel-displaced pipeline 2 of power steerig pump, the other end is connected with oil return line 9,3 inside, multifunctional electromagnetic valves unit are connected in parallel and are formed the bypass branch road by two electromagnetic valves, and can according to control signal realize complete closure, single unlatching, full open totally four kinds of array modes carry out the bypass oil mass.
Multifunctional electromagnetic valves type Electro-Hydraulic Power Steering System comprises: power steerig pump, multifunctional electromagnetic valves unit, steering control valve, power cylinder, control setup, oil tank, deflection angle speed sensor, car speed sensor, fuel-displaced pipeline, oil return line.Wherein the multifunctional electromagnetic valves unit is formed in parallel by the electromagnetic valve of two different latus rectums, and multifunctional electromagnetic valves unit one end is connected with the fuel-displaced pipeline of power steerig pump, and the other end is connected with the oil return line of power steerig pump, plays bypass action; Control setup is by frequently pressing conversion chip, level comparison module, logical operation module, solenoid valve driving module, line under-voltage protection module, overcurrent protection module to form; Control setup can carry out the combination control of totally four kinds of array modes of complete closure, single unlatching, full open to electromagnetic valve according to sensor signal.
In the utility model: the feature of described control setup is:
1. the level signal converted via frequency-pressure conversion chip 21 by car speed sensor 7 by vehicle speed signal is divided into 4 sections by level comparison module 22, the speed of a motor vehicle of respectively corresponding 4 sections, 3 comparators are the first comparator 19A, the second comparator 19B, the 3rd comparator 19C, by these 3 comparators, complete the conversion of analog signal to digital signal;
2. described logical operation module 23 by three with a door AND1～AND3, two not gate NOT1, NOT2 and one or an OR1 form;
The mouth of the 3rd comparator 19C connects the input end of NOT1 and the input end of OR1, the mouth of the second comparator 19B connects the input end of NOT2 and the input end of AND3, the mouth of the mouth of NOT1, the mouth of NOT2 and the first comparator 19A is connected respectively three input ends of AND1, the mouth of AND1 connects another input end of OR1, the mouth of OR1 connects the input end of AND2, the mouth connected electromagnetic valve driver module 24 of AND2 and AND3, according to level signal and the first driving power pipe T of 3 comparator outputs
1, the second driving power pipe T
2level signal design logical operation circuit, by not gate, with door and or the digital logic circuit such as door form;
3. described solenoid valve driving module 24 is by the first driving power pipe T1, the second driving power pipe T2, the first feedback resistance R6, the second feedback resistance R8, the first adjustable resistance R5, the second adjustable resistance R7 form, and the first adjustable resistance R5, the second adjustable resistance R7 can meet the designing requirement of different bare sizing electro-magnetic valves;
The mouth of AND2 connects the grid of the second driving power pipe T2, the mouth of AND3 connects the grid of the first driving power pipe T1, the end of the first adjustable resistance R5 connects power Vcc, the other end connects the drain electrode of the first driving power pipe T1, the source electrode of the first driving power pipe T1 connects an input end of the first electromagnetic valve 11, the end of the first feedback resistance R6 connects another input end of the first electromagnetic valve 11, the other end ground connection of the first feedback resistance R6; The end of the second adjustable resistance R7 connects power Vcc, the other end connects the drain electrode of the second driving power pipe T2, the source electrode of the second driving power pipe T2 connects an input end of the second electromagnetic valve 12, the end of the second feedback resistance R8 connects another input end of the second electromagnetic valve 12, the other end ground connection of the second feedback resistance R8;
The negative pole of the first diode D1 and the second diode D2 all is connected power Vcc, the positive pole of the first diode D1 connects the joint of the first feedback resistance R6 and the first electromagnetic valve 11, and the positive pole of the second diode D2 connects the joint of the second feedback resistance R8 and the second electromagnetic valve 12;
4. under-voltage protection module 26 can the Real-Time Monitoring power line voltage; guarantee the electromagnetic valve reliable operation; power Vcc connects under-voltage protection module 26; power Vcc connects the input end of under-voltage protection module 26; the mouth of under-voltage protection module connects respectively the mouth of AND2 and AND3; the output of AND1 in the low and high level decision logic computing module 23 of described under-voltage protection module output; when power line voltage is worth lower than certain; under-voltage protection module output low level; AND2 and AND3 be output low level also, the first driving power pipe T
1, the second driving power pipe T
2close, cut off electromagnetic valve, and the output failure alarm signal;
5. overcurrent protection module 27 can prevent that the electric current in driving circuit for electromagnetic valve is excessive, shield, the joint of the first feedback resistance R6 and the first electromagnetic valve 11, the feedback voltage of the joint of the second feedback resistance R8 and the second electromagnetic valve 12 is inputted respectively the input end of overcurrent protection module 27, the mouth of overcurrent protection module 27 connects respectively the input end of AND2 and AND3, described overcurrent protection module 27 detects the feedback voltage of feedback resistance, on duty while being greater than certain setting value, the overcurrent protection module output low level, also output low level of the AND2 of logical operation module and AND3 like this, the first driving power pipe T
1, the second driving power pipe T
2close protection electromagnetic valve, and output failure alarm signal,
6. under the tailwagging operating mode, control setup cuts off rapidly two electromagnetic valves according to the signal of car speed sensor 7 and the signal of deflection angle speed sensor 5, significantly improves the power-assisted effect.
The utility model novel structure advantages of simple, manufacture easily, uses operation light, laborsaving, energy efficient.Mainly by car speed sensor, detect the moving velocity of vehicle, control unit drives the switching of electromagnetic valve, by bypass action, changes and enters flow stream pressure and flow in the power steering rotary valve, promotes steering hardware and implements to turn to.
Its principle of work is: when automobile speed is low, controller is according to vehicle speed signal by two electromagnetic valve Close Alls, and this branch road does not play bypass flow, to obtain larger power-assisted; When automobile speed is medium, controller separately by latus rectum in two electromagnetic valves a less electromagnetic valve valve port open, the less hydraulic fluid flow rate in order to bypass, to reduce certain power-assisted; When the automobile high speed is travelled, controller separately by latus rectum in two electromagnetic valves a larger electromagnetic valve valve port open, the more hydraulic fluid flow rate in order to bypass, to obtain appropriate power-assisted; During galloping, controller is all opened two electromagnetic valve valve ports, in order to the hydraulic fluid flow rate of bypass maximum, and the power-assisted minimum that now chaufeur obtains.Controller is divided into four reasonable intervals by the speed of a motor vehicle, and each interval corresponding above-mentioned a kind of master mode, can obtain good assist characteristic by this combination master mode, has so not only simplified the structure but also has easily realized accurately controlling.
The utility model is compared with prior art: multifunctional electromagnetic valves type Electro-Hydraulic Power Steering System has kept conventional hydraulic steering hardware technology to become heat and product failure-free preceence, owing to adopting the electromagnetic valve by two different latus rectums to be formed in parallel the electromagnetic valve assembled unit as the bypass branch road, can realize four kinds of variable-flows controls under pattern, can make whole driving process all there is good assist characteristic, improve the road-holding property of automobile; Can further control Hydraulic Pump flow and pressure by the switching of regulating multifunctional electromagnetic valves, the excessive fluid overflow phenomena caused of Hydraulic Pump flow in the time of can avoiding in the conventional hydraulic steering swivel system high engine speeds operation, thus energy efficiency and the reliability of steering swivel system improved; In addition, this infrastructure cost is cheap, and frequency response is fast, and output driving current is large, the circuit cal val is little, it is accurate to control, and compactness rational in infrastructure, go for various.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the utility model multifunctional electromagnetic valves and deflector johning knot composition, and its left figure is front view, and right figure is left view;
Fig. 3 is the utility model controller diagram of circuit;
Fig. 4 is the utility model control setup inner function module structured flowchart
Fig. 5 is the utility model output total external characteristic steering force characteristic diagram of curves, and wherein abscissa represents moment of torsion M (N.m), ordinate representative pressure P (MPa).
In figure: 1, power steerig pump; 2, fuel-displaced pipeline; 3, multifunctional electromagnetic valves unit; 4, deflection angle speed sensor; 5, steering control valve; 6, power cylinder 7, car speed sensor; 8, control setup; 9, oil return line; 10, oil tank; 11, the first electromagnetic valve; 12, the second electromagnetic valve; 13, oil inlet four-way piece; 14, return opening four-way piece; 15, bridge piece; 16, connected pipes; 17, rotary valve chargine line; 18, the fuel-displaced pipeline of rotary valve; 19, comparator; 20, Digital Logic gate circuit; 21, frequently-pressure conversion chip LM331; 22, level comparison module; 23, logical operation module; 24, solenoid valve driving module; 25, power module; 26, line under-voltage protection module; 27, overcurrent protection module.
Wherein the first electromagnetic valve 11 is electromagnetic valves of little latus rectum, and the second electromagnetic valve 12 is electromagnetic valves of large latus rectum.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, multifunctional electromagnetic valves type Electro-Hydraulic Power Steering System comprises: power steerig pump 1, fuel-displaced pipeline 2, multifunctional electromagnetic valves unit 3, deflection angle speed sensor 4, steering control valve 5, power cylinder 6, car speed sensor 7, control setup 8, oil return line 9, oil tank 10.Wherein multifunctional electromagnetic valves unit one end is connected with the fuel-displaced pipeline 2 of power steerig pump, the other end is connected with the oil return line 9 of power steerig pump, play bypass action, inside, multifunctional electromagnetic valves unit is formed in parallel by the first electromagnetic valve 11 of a little latus rectum and the second electromagnetic valve 12 of a large latus rectum.
As shown in Figure 2, the first electromagnetic valve 11 is connected by an oil inlet four-way piece 13 with the second electromagnetic valve 12, and oil inlet four-way piece 13 two other interface one ends are connected with fuel-displaced pipeline 2, and the other end is connected with rotary valve oil inlet 17; The electromagnetic valve oil outlet is connected with return opening four-way piece 14 by bridge piece 15, connected pipes 16, return opening four-way piece 14 two other interface one ends are connected with oil return line 9, the other end is connected with rotary valve oil outlet pipe 18, and control setup is controlled the switching of electromagnetic valve by sensor signal.
As shown in Figure 3, control setup is by frequently pressing conversion chip, level comparison module, logical operation module, solenoid valve driving module, line under-voltage protection module, overcurrent protection module to form; Concrete controller flow process as shown in Figure 4; vehicle speed signal is after signal condition becomes square wave; through frequently pressing conversion chip to change level signal into; export the low and high level signal to solenoid valve driving module through logical operation module again; the driving electromagnetic valve opens and closes, and line under-voltage protection and overcurrent protection module are in order to protect electromagnetic valve not to be subject to chance failure former thereby damage.
In the utility model, control setup can carry out complete closure to electromagnetic valve according to sensor signal, single unlatching, the full open combination of totally four kinds of array modes is controlled, the utility model in use, when chaufeur just starts automobile, need relatively large power steering, now electromagnetic valve assembled unit two closed electromagnetic valves do not play bypass action, increase along with the speed of a motor vehicle, controller as required, open the electromagnetic valve that one of them latus rectum is less, in the time of the automobile high speed, open the electromagnetic valve that latus rectum is larger, by the time at a high speed the time, by whole valve opens, reduce with this hydraulic fluid flow rate entered in steering control valve, thereby increase steering effort, to avoid losing road feel, improve the safety performance of whole steering swivel system, in addition, for the operating mode promptly turned to greatly at a high speed, control setup can be made the instruction of contract fully to two electromagnetic valves in conjunction with the deflection angle speed sensor signal, thereby effectively solve the light safety problem that turns under this kind of dangerous working condition, specifically in conjunction with Fig. 3, be described further:
The vehicle speed signal of taking out from gauge panel, it is the square-wave signal that frequency changes with the speed of a motor vehicle, frequency is directly proportional to the speed of a motor vehicle substantially, need nurse one's health and make it become desirable square wave vehicle speed signal, via frequently-press conversion chip 21 to change the level signal with frequency change into, LM331 powers through power module, and peripheral as long as just can reach the purpose of voltage to frequency conversion with a small amount of resistance and electric capacity, level comparison module 22 is by 3 comparators 19 and four resistance R
1, R
2, R
3, R
4form, four resistance play the dividing potential drop effect, 3 kinds of different reference voltages are provided to comparator 19, are respectively V
0, V
1, V
2and V
0<V
1<V
2.
As LM331 output voltage V<V
0the time, I
2i
1i
0=000
*;
Work as V
0<V<V
1the time, I
2i
1i
0=001;
Work as V
1<V<V
2the time, I
2i
1i
0=011;
Work as V>V
2the time, I
2i
1i
0=111;
* 0 presentation logic low level, 1 presentation logic high level.
The low and high level signal of level comparison module 22 output is input to logical operation module 23, and logical operation module 23 is by two phase inverters, two and door and one or form Y
0, Y
1it is the low and high level signal of logical operation module output.
Work as I
2i
1i
0=000
*the time, Y
1y
0=00;
Work as I
2i
1i
0=001 o'clock, Y
1y
0=01;
Work as I
2i
1i
0=011 o'clock, Y
1y
0=10;
Work as I
2i
1i
0=111 o'clock, Y
1y
0=11;
Y
0, Y
1control respectively the T of solenoid valve driving module 24
1, T
2, T
1, T
2be the N-channel MOS pipe, the advantage such as it has, and input resistance is high, noise is little, stability low in energy consumption, warm is good, therefore be widely used in the power level amplifying circuit.T in solenoid valve driving module 24
1, T
2play the electronics on-off action, when the grid input high level, power tube is opened, and in driving circuit, has electric current to flow through, and electromagnetic valve is opened; When the grid input low level, power tube is closed, and electromagnetic valve restPoses.R
5, R
7be dropping resistor to meet the requirement of electric current in circuit, and R
5, R
7be adjustable resistance, can be adjusted accordingly according to the electromagnetic valve of different latus rectums R
6, R
8be feedback resistance, in order to detect the electric current in driving circuit, do overcurrent protection, D
1, D
2be the flywheel diode of two electromagnetic valves, while giving closed electromagnetic valve, provide current by pass, be unlikely to the high electrical breakdown metal-oxide-semiconductor that electromagnetic valve coil is produced, also improved speed of response simultaneously.
The 25th, power module, be mainly to be the voltage transition of storage battery 24V each chip and the required voltage of circuit.
The 26th, the line under-voltage protection module, to guarantee the reliability service of electromagnetic valve, when the under-voltage protection module detects the power supply power supply when too low, under-voltage protection module output low level, turn-off the power tube that drives electromagnetic valve, and provide failure alarm signal.
The 27th, overcurrent protection module, when certain reason (such as the electromagnetic valve coil short circuit) causes the electric current of driving circuit excessive, overcurrent protection module output low level, the equal output low level of the AND2 in module 23 and AND3, thereby the T in module 24
1, T
2close, electromagnetic valve is also closed.
After the utility model adopts said structure, in assembled unit, electromagnetic valve has been realized the control function of four kinds of array modes according to control signal, the required steering effort applied of chaufeur is controlled in suitable scope, also solved for the light safety problem that turns under the urgent large steering situation of high speed, and realize the output complete characteristic curve, as shown in Figure 5.The utility model circuit is simple, and the life-span is permanent, easily realizes accurately controlling, and has solved the problem of " unstable ", has improved safety and the road-holding property of running car.
Claims (5)
1. a variable-flow electric-controlled hydraulic steering swivel system, it is characterized in that: comprise power steerig pump (1), multifunctional electromagnetic valves unit (3), steering control valve (5), power cylinder (6), car speed sensor (7), deflection angle speed sensor (4), control setup (8), oil tank (10), wherein multifunctional electromagnetic valves unit (3) one ends are connected with the fuel-displaced pipeline of power steerig pump (2), the other end is connected with oil return line (9), multifunctional electromagnetic valves unit (3) is inner to be connected in parallel and to be formed the bypass branch road by two electromagnetic valves, and can realize complete closure according to control signal, single unlatching, totally four kinds of array modes of full open is carried out the bypass oil mass.
2. variable-flow electric-controlled hydraulic steering swivel system according to claim 1, it is characterized in that: multifunctional electromagnetic valves unit (3) are connected in parallel and are formed by the first electromagnetic valve (11) and the second electromagnetic valve (12), and two electromagnetic valves are connected with oil return line (9) with the fuel-displaced pipeline (2) of oil pump respectively with return opening four-way piece (14) by oil inlet four-way piece (13).
3. variable-flow electric-controlled hydraulic steering swivel system according to claim 1, is characterized in that described control setup (8) comprises to press conversion chip (21), level comparison module (22), logical operation module (23), solenoid valve driving module (24), line under-voltage protection module (26), overcurrent protection module (27) frequently.
4. variable-flow electric-controlled hydraulic steering swivel system according to claim 3, it is characterized in that: described control setup (8) feature is as follows:
1. the level signal converted via frequency-pressure conversion chip (21) by car speed sensor (7) by vehicle speed signal is divided into 4 sections by level comparison module (22), the speed of a motor vehicle of respectively corresponding 4 sections, 3 comparators are the first comparator (19A), the second comparator (19B), the 3rd comparator (19C), by these 3 comparators, complete the conversion of analog signal to digital signal;
2. described logical operation module (23) by three with a door AND1～AND3, two not gate NOT1, NOT2 and one or an OR1 form;
The mouth of the 3rd comparator (19C) connects the input end of NOT1 and the input end of OR1, the mouth of the second comparator (19B) connects the input end of NOT2 and the input end of AND3, the mouth of the mouth of NOT1, the mouth of NOT2 and the first comparator (19A) is connected respectively three input ends of AND1, the mouth of AND1 connects another input end of OR1, the mouth of OR1 connects the input end of AND2, the mouth connected electromagnetic valve driver module (24) of AND2 and AND3, according to level signal and the first driving power pipe T of 3 comparator outputs
1, the second driving power pipe T
2level signal design logical operation circuit, by not gate, with door and or the digital logic circuit such as door form;
3. described solenoid valve driving module (24) is by the first driving power pipe T1, the second driving power pipe T2, the first feedback resistance R6, the second feedback resistance R8, the first adjustable resistance R5, the second adjustable resistance R7 form, and the first adjustable resistance R5, the second adjustable resistance R7 can meet the designing requirement of different bare sizing electro-magnetic valves;
The mouth of AND2 connects the grid of the second driving power pipe T2, the mouth of AND3 connects the grid of the first driving power pipe T1, the end of the first adjustable resistance R5 connects power Vcc, the other end connects the drain electrode of the first driving power pipe T1, the source electrode of the first driving power pipe T1 connects an input end of the first electromagnetic valve (11), the end of the first feedback resistance R6 connects another input end of the first electromagnetic valve (11), the other end ground connection of the first feedback resistance R6; The end of the second adjustable resistance R7 connects power Vcc, the other end connects the drain electrode of the second driving power pipe T2, the source electrode of the second driving power pipe T2 connects an input end of the second electromagnetic valve (12), the end of the second feedback resistance R8 connects another input end of the second electromagnetic valve (12), the other end ground connection of the second feedback resistance R8;
The negative pole of the first diode D1 and the second diode D2 all is connected power Vcc, the positive pole of the first diode D1 connects the joint of the first feedback resistance R6 and the first electromagnetic valve (11), and the positive pole of the second diode D2 connects the joint of R8 and the second electromagnetic valve (12);
4. under-voltage protection module (26) can the Real-Time Monitoring power line voltage; guarantee the electromagnetic valve reliable operation; power Vcc connects under-voltage protection module (26); power Vcc connects the input end of under-voltage protection module (26); the mouth of under-voltage protection module connects respectively the mouth of AND2 and AND3; the output of AND1 in the low and high level decision logic computing module (23) of described under-voltage protection module output; when power line voltage is worth lower than certain; under-voltage protection module output low level; AND2 and AND3 be output low level also, the first driving power pipe T
1, the second driving power pipe T
2close, cut off electromagnetic valve, and the output failure alarm signal;
5. overcurrent protection module 27 can prevent that the electric current in driving circuit for electromagnetic valve is excessive, shield, the joint of the first feedback resistance R6 and the first electromagnetic valve (11), the feedback voltage of the joint of the second feedback resistance R8 and the second electromagnetic valve (12) is inputted respectively the input end of overcurrent protection module (27), the mouth of overcurrent protection module (27) connects respectively the input end of AND2 and AND3, described overcurrent protection module (27) detects the feedback voltage of feedback resistance, on duty while being greater than certain setting value, overcurrent protection module (27) output low level, also output low level of the AND2 of logical operation module and AND3 like this, the first driving power pipe T
1, the second driving power pipe T
2close protection electromagnetic valve, and output failure alarm signal,
6. under the tailwagging operating mode, control setup cuts off rapidly two electromagnetic valves according to the signal of car speed sensor (7) and the signal of deflection angle speed sensor (5).
5. variable-flow electric-controlled hydraulic steering swivel system according to claim 2, it is characterized in that: described the first electromagnetic valve (11) is the electromagnetic valve of little latus rectum, described the second electromagnetic valve (12) is the electromagnetic valve of large latus rectum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220496119 CN202966414U (en) | 2012-09-26 | 2012-09-26 | Flow variable electronically-controlled hydraulic steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220496119 CN202966414U (en) | 2012-09-26 | 2012-09-26 | Flow variable electronically-controlled hydraulic steering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202966414U true CN202966414U (en) | 2013-06-05 |
Family
ID=48507527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220496119 Expired - Fee Related CN202966414U (en) | 2012-09-26 | 2012-09-26 | Flow variable electronically-controlled hydraulic steering system |
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| Country | Link |
|---|---|
| CN (1) | CN202966414U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104908807A (en) * | 2015-07-13 | 2015-09-16 | 北汽福田汽车股份有限公司 | Noise and vibration reduction device for steering system |
| CN106515847A (en) * | 2016-12-05 | 2017-03-22 | 聊城大学 | Hydraulic steering controlling system for navigation of tractor and controlling method |
-
2012
- 2012-09-26 CN CN 201220496119 patent/CN202966414U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104908807A (en) * | 2015-07-13 | 2015-09-16 | 北汽福田汽车股份有限公司 | Noise and vibration reduction device for steering system |
| CN106515847A (en) * | 2016-12-05 | 2017-03-22 | 聊城大学 | Hydraulic steering controlling system for navigation of tractor and controlling method |
| CN106515847B (en) * | 2016-12-05 | 2018-08-17 | 聊城大学 | A kind of tractor navigation fluid-link steering control system and control method |
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