CN103661593A - Control device applied to power-driven hydraulic steering system - Google Patents
Control device applied to power-driven hydraulic steering system Download PDFInfo
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- CN103661593A CN103661593A CN201210328792.6A CN201210328792A CN103661593A CN 103661593 A CN103661593 A CN 103661593A CN 201210328792 A CN201210328792 A CN 201210328792A CN 103661593 A CN103661593 A CN 103661593A
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- module
- electromagnetic valve
- power
- voltage
- steering system
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Abstract
The invention relates to the field of an automobile electric control hydraulic steering system and discloses a control device applied to a power-driven hydraulic steering system. The control device is characterized by comprising a frequency-voltage conversion chip, a voltage comparison module, a logic operation module, an electromagnetic valve drive module, a power supply module and an undervoltage protection module. The control device can carry out combination control on the on-off state of an electromagnetic valve according to an automobile speed signal, good operation hand feelings can be effectively ensured by adjusting bypass flow, and the undervoltage protection module detects the voltage of a power supply in real time.
Description
Technical field
The present invention relates to automobile electrical control hydraulic steering system field, be specifically related to a kind ofly can change by-pass collar and the control setup thereof that enters flow stream pressure and flow in power steering rotary valve, be applicable to the commercial vehicle/comm..vehicles such as motor omnibus, goods carrying vehicle.
Background technology
At present, in commercial vehicle/comm..vehicle field, widespread use is hydraulic power-assist steering system, only there is fixing hand force property, when automobile low speed driving, steering wheel operating has good portability, when the speed of a motor vehicle is faster time, 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, the problem that produces automobile " unstable ", has reduced the safety performance that commercial vehicle/comm..vehicle is run at high speed, and is also unfavorable for the requirement of vehicle energy saving.Because conventional hydraulic servo steering system cannot 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 volume control device difference at present.
In existing scheme, in china national practical new-type patent 200320118460.1, adopt stepping motor to regulate the restriction of bypass disc big or small, to control the hydraulic fluid flow rate that enters into steering control valve.This improvement project can solve the problem of losing road feel when automobile high-speed turns to a certain extent, but this form structure is complicated, and 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 occurs opening unsettled phenomenon; In china national practical new-type patent 200720034596.2, adopt DC machine directly to drive oil pump, by controlling the size of power line voltage and electric current, indirectly control Hydraulic Pump flow and pressure, 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.
The deficiencies such as above-mentioned these scheme ubiquities are wayward, and cost of product is higher, complex structure, are difficult to obtain the good power-assisted feel of chaufeur needs.In order to overcome, the deficiencies in the prior art are existing a kind ofly to keep on original hydraulic power-assist steering system basis, is setting up a set of multifunctional electromagnetic valves unit as bleed off circuit, by accurate control, can realize bypass oil mass multistage adjustable, the Electro-Hydraulic Power Steering System that assist characteristic is better.
Summary of the invention
The under-voltage protection module the present invention relates to is for electrohydraulic steering system, 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 present invention 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 automobile high speed, open the electromagnetic valve that latus rectum is larger, by the time at a high speed time, by whole valve opens, with this, reduce the hydraulic fluid flow rate entering 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 turning to greatly at a high speed, control setup can be made the instruction of contract fully to two electromagnetic valves in conjunction with deflection angle speed sensor signal, thereby effectively solve the light safety problem that turns under this kind of dangerous working condition.
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, to vehicle speed signal, need nurse one's health and become desirable square wave, 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 object of voltage to frequency conversion with a small amount of resistance and electric capacity, voltage comparison module 22 is by 3 comparators 19 and four resistance R
1, R
2, R
3, R
4form, four resistance play 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
0time, I
2i
1i
0=000
*;
Work as V
0<V<V
1time, I
2i
1i
0=001;
Work as V
1<V<V
2time, I
2i
1i
0=011;
Work as V>V
2time, I
2i
1i
0=111;
* 0 presentation logic low level, 1 presentation logic high level.
The low and high level signal of voltage 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
*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 N-channel MOS pipe, the advantage such as it has, and input resistance is high, noise is little, low in energy consumption, warm stability is good, is therefore widely used in power level amplifying circuit.T in solenoid valve driving module 24
1, T
2play electronic switching, when grid input high level, power tube is opened, and has electric current to flow through in driving circuit, and electromagnetic valve is opened; When 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 make the high electrical breakdown metal-oxide-semiconductor of electromagnetic valve coil generation, also improved speed of response simultaneously.
The 25th, power module, is to be mainly each chip and the required voltage of circuit the voltage transition of storage battery 24V.
The 26th, line under-voltage protection module, to guarantee the reliability service of electromagnetic valve, when under-voltage protection module detects power supply power supply when too low, under-voltage protection module output low level, turn-offs the power tube that drives electromagnetic valve, and provides failure alarm signal.
The 27th, overcurrent protection module, when certain reason (such as 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.
The present invention adopts after 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 applying 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 output complete characteristic curve, as shown in Figure 5.Circuit of the present invention is simple, and the life-span is permanent, easily realizes accurately and controlling, and has solved the problem of " unstable ", has improved safety and the road-holding property of running car.
Accompanying drawing explanation
Fig. 1 is the controller diagram of circuit of the control setup of electrohydraulic steering system;
Fig. 2 is the inner function module structured flowchart for the control setup of electrohydraulic steering system;
In figure: 19, comparator; 20, Digital Logic gate circuit; 21, frequently-pressure conversion chip; 22, voltage comparison module; 23, logical operation module; 24, solenoid valve driving module; 25, power module; 26, line under-voltage protection module; 27, overcurrent protection module.
Concrete embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
In the present invention, 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 present invention 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 automobile high speed, open the electromagnetic valve that latus rectum is larger, by the time at a high speed time, by whole valve opens, with this, reduce the hydraulic fluid flow rate entering 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 turning to greatly at a high speed, control setup can be made the instruction of contract fully to two electromagnetic valves in conjunction with 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. 1, 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, to vehicle speed signal, need nurse one's health and become desirable square wave, 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 object of voltage to frequency conversion with a small amount of resistance and electric capacity, voltage comparison module 22 is by 3 comparators 19 and four resistance R
1, R
2, R
3, R
4form, four resistance play 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
0time, I
2i
1i
0=000
*;
Work as V
0<V<V
1time, I
2i
1i
0=001;
Work as V
1<V<V
2time, I
2i
1i
0=011;
Work as V>V
2time, I
2i
1i
0=111;
* 0 presentation logic low level, 1 presentation logic high level.
The low and high level signal of voltage 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
*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 N-channel MOS pipe, the advantage such as it has, and input resistance is high, noise is little, low in energy consumption, warm stability is good, is therefore widely used in power level amplifying circuit.T in solenoid valve driving module 24
1, T
2play electronic switching, when grid input high level, power tube is opened, and has electric current to flow through in driving circuit, and electromagnetic valve is opened; When 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 make the high electrical breakdown metal-oxide-semiconductor of electromagnetic valve coil generation, also improved speed of response simultaneously.
The 25th, power module, is to be mainly each chip and the required voltage of circuit the voltage transition of storage battery 24V.
The 26th, line under-voltage protection module, to guarantee the reliability service of electromagnetic valve, when under-voltage protection module detects power supply power supply when too low, under-voltage protection module output low level, turn-offs the power tube that drives electromagnetic valve, and provides failure alarm signal.
The 27th, overcurrent protection module, when certain reason (such as 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.
The present invention adopts after 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 applying 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 realized output complete characteristic curve.Circuit of the present invention is simple, and the life-span is permanent, easily realizes accurately and controlling, and has solved the problem of " unstable ", has improved safety and the road-holding property of running car.
Claims (1)
1. the control setup for electrohydraulic steering system; it is characterized in that: comprise frequently-press conversion chip, voltage comparison module, logical operation module, solenoid valve driving module, power module, under-voltage protection module; control setup combines control according to vehicle speed signal to electromagnetic valve opening and closing state; regulate bypass flow can effectively guarantee good manipulation feel, under-voltage protection module Real-Time Monitoring power line voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210328792.6A CN103661593A (en) | 2012-09-06 | 2012-09-06 | Control device applied to power-driven hydraulic steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210328792.6A CN103661593A (en) | 2012-09-06 | 2012-09-06 | Control device applied to power-driven hydraulic steering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103661593A true CN103661593A (en) | 2014-03-26 |
Family
ID=50300669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210328792.6A Pending CN103661593A (en) | 2012-09-06 | 2012-09-06 | Control device applied to power-driven hydraulic steering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103661593A (en) |
-
2012
- 2012-09-06 CN CN201210328792.6A patent/CN103661593A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140326 |