CN106274757B - Electric control hydraulic power-assisted steering system with high-low voltage power supply conversion circuit - Google Patents
Electric control hydraulic power-assisted steering system with high-low voltage power supply conversion circuit Download PDFInfo
- Publication number
- CN106274757B CN106274757B CN201610799458.7A CN201610799458A CN106274757B CN 106274757 B CN106274757 B CN 106274757B CN 201610799458 A CN201610799458 A CN 201610799458A CN 106274757 B CN106274757 B CN 106274757B
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- power supply
- voltage
- low
- voltage power
- steering system
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 34
- 230000005669 field effect Effects 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
Abstract
The invention provides an electric control hydraulic power-assisted steering system with a high-low voltage power supply conversion circuit, which is used for assisting steering of a vehicle and mainly comprises a high-voltage main power supply, a low-voltage power supply, a high-low voltage power supply conversion functional circuit and a controller. The high-voltage main power supply is simultaneously connected with the high-voltage and low-voltage power supply conversion functional circuit and the controller. The high-low voltage power supply conversion functional circuit comprises a direct current boosting module, and a low-voltage power supply is connected with the controller through the direct current boosting module. The technical scheme of the invention comprises a high-voltage main power supply, a low-voltage power supply and a high-low voltage power supply conversion function circuit, wherein the high-low voltage power supply conversion function circuit can monitor the working state of the high-voltage main power supply in real time, and can instantly and quickly switch to the low-voltage power supply when the electric hydraulic power-assisted steering system of the vehicle loses normal power supply of the high-voltage main power supply, so that the vehicle is prevented from being out of control in steering.
Description
Technical Field
The invention belongs to the technical field of motor control, relates to an electric hydraulic power steering system of a vehicle, and particularly relates to an electric control hydraulic power steering system with a high-low voltage power supply conversion circuit.
Background
The electric hydraulic steering guide device is applied to steering systems of heavy commercial vehicles (such as trucks and buses), electric forklifts, agricultural vehicles, hybrid vehicles and the like, consists of an electric motor and a controller, and has great advantages compared with the traditional mechanical hydraulic steering or electric hydraulic steering.
However, the current electro-hydraulic steering guide device has unsafe problems, such as sudden loss of normal high-voltage main power supply during steering, which easily causes the vehicle to be out of control in steering, thereby possibly causing accidents.
Disclosure of Invention
The invention aims to overcome the potential safety hazard caused by sudden loss of power supply of a high-voltage main power supply of an electric hydraulic power-assisted steering system of a vehicle in the prior art, and provides an electric control hydraulic power-assisted steering system with a high-low voltage power supply conversion circuit, which can be instantly and quickly switched to a direct-current 12-volt or 24-volt low-voltage power supply to provide temporary power supply when the electric hydraulic power-assisted steering system of the vehicle loses normal power supply of the high-voltage main power supply so as to ensure that the vehicle cannot be out of control in steering.
The technical scheme of the invention is as follows:
an electric control hydraulic power-assisted steering system with a high-low voltage power supply conversion circuit is used for assisting steering of a vehicle and mainly comprises a high-voltage main power supply, a low-voltage power supply, a high-low voltage power supply conversion function circuit and a controller. The high-voltage main power supply is simultaneously connected with the high-voltage and low-voltage power supply conversion functional circuit and the controller. The high-low voltage power supply conversion functional circuit comprises a direct current boosting module, and a low-voltage power supply is connected with the controller through the direct current boosting module.
The controller is used to drive an electric motor of the auxiliary steering system.
The high-low voltage power supply conversion function circuit mainly comprises a comparator chip, an electronic switching tube, a direct current boosting module, a plurality of resistors and a plurality of diodes.
The low-voltage power supply is connected with the controller through a direct current boosting module in the high-voltage and low-voltage power supply conversion functional circuit.
The high-voltage main power supply is a 100V to 500V direct-current power supply, and the low-voltage power supply is a 12V or 24V direct-current power supply.
The electronic switch includes a transistor Q30 and a field effect transistor Q31.
The field effect transistor Q31 is a P-channel MOS transistor.
The invention has the beneficial effects that:
the technical scheme of the invention comprises a low-voltage power supply and a high-low voltage power supply conversion function circuit, wherein the high-low voltage power supply conversion function circuit can monitor the working state of a high-voltage main power supply in real time, and can instantly and quickly switch to the low-voltage power supply when the electric hydraulic power-assisted steering system of the vehicle loses normal power supply of the high-voltage main power supply, so that the vehicle is prevented from being out of control in steering.
Drawings
FIG. 1 is a schematic diagram of an electrically controlled hydraulic power steering system having a high-low voltage power conversion circuit according to the present invention;
FIG. 2 is a schematic diagram of the structure of the high-low voltage power supply conversion circuit of the present invention;
fig. 3 is a schematic diagram of the operation principle and package pins of the comparator chip LM 339.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings 1-3 to facilitate the understanding and implementation of the technical solutions of the present invention.
As shown in fig. 1, the electrically controlled hydraulic power steering system with high-low voltage power supply conversion circuit of the present invention is used for auxiliary steering of a vehicle, and mainly comprises a high-voltage main power supply DC1, a low-voltage power supply DC2, a high-low voltage power supply conversion function circuit and a controller. The high-voltage main power supply DC1 is connected with the high-voltage and low-voltage power supply conversion functional circuit and the controller at the same time, and the low-voltage power supply DC2 is connected with the controller through the high-voltage and low-voltage power supply conversion functional circuit. As shown, the controller is used to drive the motor of the auxiliary steering system.
In the invention, the high-voltage main power supply can select a direct-current power supply in the range of 100V to 500V, and the low-voltage power supply can select a direct-current power supply of 12V or 24V.
Normally, a high-voltage main power supply (such as 100 volts or 500 volts direct current) and a low-voltage power supply (such as 12 volts or 24 volts direct current) are configured on the vehicle at the same time, and the high-voltage main power supply is mainly used for supplying power to the controller at ordinary times, and the controller drives the motor so as to ensure the normal operation of the steering system.
When the high-voltage main power supply is lost, the high-voltage and low-voltage power supply conversion functional circuit can monitor that the high-voltage main power supply is lost in real time, instantly and immediately switches to a low-voltage power supply channel, boosts the low-voltage power to the previous power voltage level, continuously supplies power to the controller by the high voltage, and drives the motor by the controller so as to maintain the system to continuously and normally run.
Fig. 2 shows a schematic diagram of a high-low voltage power supply conversion functional circuit of the present invention, as shown in the figure: the high-low voltage power supply conversion functional circuit mainly comprises a comparator chip LM339, a triode Q30, a field effect transistor Q31, a direct current boosting module, resistors R30-37, a diode D1 and a diode D2. The specific wiring diagram is shown in figure 2. The high-voltage main power supply is connected to the inverting input end of the comparator chip LM339 through voltage dividing resistors R33 and R34, and R30-32, R35, R37 and Q30 serve as peripheral circuits of the comparator chip LM 339. Wherein, R35, R30 and R31 are connected in series and then are used as voltage dividing resistors of the non-inverting input end of the comparator chip LM 339. The non-inverting input of comparator chip LM339 is connected between R30 and R31. R31 may be an adjustable resistor, with the end of the resistor not connected to the comparator chip LM339 connected to ground.
The field effect transistor Q31 is connected between the comparator chip LM339 and the DC boost module. A resistor R36 is connected as a protection resistor between the gate and source of Q31. In this embodiment, the field effect transistor Q31 may be a P-channel MOS transistor.
The low-voltage power supply is connected with the controller through the direct-current boosting module, namely the low-voltage power supply is connected with the controller through the direct-current boosting module in the high-low voltage power supply conversion functional circuit.
The diode D30 is connected to the output end of the high-voltage main power supply, and the diode D31 is connected to the output end of the direct-current boosting module. The diode D30 is connected in parallel with the diode D31.
The output of LM339 is equivalent to a transistor without a collector resistor, and when in use, the output is connected to the positive power supply VDD through a resistor R37 (called a pull-up resistor, selected from 3-15K). The selection of pull-up resistors with different resistance values affects the value of the high potential at the output terminal. Because when the output transistor is turned off, its collector voltage is substantially dependent on the values of the pull-up resistor and the load.
The LM339 comparator has two inputs and one output. One of the two inputs is referred to as the non-inverting input, indicated by "+", and the other is referred to as the inverting input, indicated by "-". When the two voltages are compared, a fixed voltage is applied to any input end to serve as a reference voltage (also called threshold level, which can select any point of an input common mode range of LM 339), and a signal voltage to be compared is applied to the other end. When the voltage at the + end is higher than that at the-end, the output tube is cut off, which is equivalent to an open circuit at the output end. When the voltage at the minus end is higher than that at the plus end, the output tube is saturated, which is equivalent to that the output end is connected with a low potential. A difference of more than 10mV between the two input terminals ensures that the output can be reliably switched from one state to the other, and therefore, it is desirable to use LM339 for weak signal detection, etc.
As shown in fig. 3, the LM339 block contains four independent voltage comparators inside, similar to gain-non-adjustable operational amplifiers. The voltage comparator is characterized in that: 1) the offset voltage is small, and the typical value is 2 mV; 2) the power supply voltage range is wide, the single power supply is 2-36V, and the dual power supply voltage is +/-1V- +/-18V; 3) the internal resistance of the comparison signal source is more limited; 4) the common mode range is large and is 0 to (Ucc-1.5V) Vo; 5) the differential input voltage range is large enough to be equal to the power supply voltage; 6) the output end potential can be flexibly and conveniently selected. In addition, the outputs of the comparators are allowed to be connected together for use.
LM339 is substantially identical to the parameters of IR2339, ANI339, SF339, etc., and is used interchangeably in the present invention.
The operation and principle of the present invention will be described in detail with reference to the accompanying drawings and the foregoing description.
Normally, a high-voltage main power supply (such as 100 volts or 500 volts direct current, and is exemplified by 380 volts herein) and a low-voltage power supply (such as 12 volts or 24 volts direct current, and is exemplified by 12 volts herein) are both provided on the vehicle, and the high-voltage main power supply mainly supplies power to the controller at ordinary times, and the controller drives the motor to ensure that the system normally operates.
When the high-voltage main power supply is normal, the voltage U4 of the negative input end (4 pin) of one channel of the comparator chip LM339 is greater than the voltage U5 of the positive input end (5 pin), U5 is 2.5V, the output U2(2 pin) is low level, the direct current boosting module does not input and does not work, at this time, the low-voltage power supply is disconnected through Q31, and the latter high-voltage power supply is provided by the high-voltage main power supply.
When the high-voltage main power supply is lost, the voltage U4 of the negative input end (4 pin) of one channel of the comparator chip LM339 is smaller than the voltage U5 of the positive input end (5 pin), U5 is 2.5V, the high level of U2(2 pin) is output, at the moment, Q30 is saturated, so that the voltage drop on the resistor R35 is reduced to be close to zero, the voltage of U5 is further improved, U4 is further smaller than U5, and the stability of power supply switching control is guaranteed; at this time, the U2 drives the Q31 to be switched on by high level driving, the low voltage power supply is supplied to the DC boosting module, the output voltage of the DC boosting module is instantly boosted and is output to a high voltage power supply channel through a diode D31, and at this time, because the voltage of the high voltage main power supply is lower than the output voltage of the DC boosting module, the high voltage main power supply and the high voltage power supply are reliably output to the high voltage power supply channel at a parallel node formed by the diode D30 and the diode D31, and the normal operation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. An electrically controlled hydraulic power steering system with a high-low voltage power supply conversion circuit, which is used for an auxiliary steering system of a vehicle, and is characterized in that: the high-voltage power supply switching circuit mainly comprises a high-voltage main power supply, a low-voltage power supply, a high-voltage and low-voltage power supply switching function circuit and a controller; the high-voltage main power supply is simultaneously connected with the high-voltage and low-voltage power supply conversion functional circuit and the controller; the high-low voltage power supply conversion functional circuit comprises a direct current boosting module, and a low-voltage power supply is connected with the controller through the direct current boosting module; the controller is used for driving a motor of the auxiliary steering system; the high-low voltage power supply conversion function circuit comprises a comparator chip, an electronic switching tube, a direct current boosting module, a plurality of resistors and a plurality of diodes; the electronic switching tube comprises a triode Q30 and a field effect tube Q31; the high-voltage main power supply is connected to the inverting input end of the comparator chip LM339 through voltage dividing resistors R33 and R34, and R30-32, R35, R37 and Q30 serve as peripheral circuits of the comparator chip LM 339; wherein, R35, R30 and R31 are connected in series and then are used as voltage dividing resistors of the non-inverting input end of the comparator chip LM 339; the non-inverting input terminal of the comparator chip LM339 is connected between R30 and R31; one end of R31, which is not connected with the comparator chip LM339, is grounded; the base electrode of the triode Q30 is connected with the output end of the comparator chip LM339, the collector electrode is connected with the positive power supply VDD, and the emitter electrode is connected with the non-inverting input end of the comparator chip LM339 through a resistor R30; the field effect transistor Q31 is connected between the comparator chip LM339 and the direct current boosting module; r32 and R37 are connected in series between the gate of the fet Q31 and the positive power supply VDD, wherein R32 is connected in parallel between the output of the comparator chip LM339 and the positive power supply, and R37 is connected in series between the output of the comparator chip LM339 and the gate of the fet Q31; the drain electrode of the field effect transistor Q31 is connected with the direct current boosting module; the source electrode of the field effect transistor Q31 is grounded; the resistor R36 is connected between the gate and the source of the Q31; the diode D30 is connected to the output end of the high-voltage main power supply, and the diode D31 is connected to the output end of the direct-current boosting module; the diode D30 is connected in parallel with the diode D31; the low-voltage power supply is connected with the controller through a direct current boosting module in the high-voltage and low-voltage power supply conversion functional circuit.
2. The electrically controlled hydraulic power steering system according to claim 1, wherein: the low-voltage power supply is connected with the controller through a direct current boosting module in the high-voltage and low-voltage power supply conversion functional circuit.
3. The electrically controlled hydraulic power steering system according to claim 1, wherein: the high-voltage main power supply is a 100V to 500V direct-current power supply, and the low-voltage power supply is a 12V or 24V direct-current power supply.
4. The electrically controlled hydraulic power steering system according to claim 1, wherein: the field effect transistor Q31 is a P-channel MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610799458.7A CN106274757B (en) | 2016-08-31 | 2016-08-31 | Electric control hydraulic power-assisted steering system with high-low voltage power supply conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610799458.7A CN106274757B (en) | 2016-08-31 | 2016-08-31 | Electric control hydraulic power-assisted steering system with high-low voltage power supply conversion circuit |
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| CN106274757A CN106274757A (en) | 2017-01-04 |
| CN106274757B true CN106274757B (en) | 2021-02-19 |
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| CN201610799458.7A Active CN106274757B (en) | 2016-08-31 | 2016-08-31 | Electric control hydraulic power-assisted steering system with high-low voltage power supply conversion circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356465A (en) * | 2018-04-10 | 2019-10-22 | 郑州宇通客车股份有限公司 | A kind of double source steering boost system control method and system |
| CN114709965A (en) * | 2022-04-02 | 2022-07-05 | 全兴精工集团有限公司 | Double-source motor pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4428140B2 (en) * | 2004-05-21 | 2010-03-10 | 株式会社デンソー | Electronic control device, electric power steering device, and variable transmission ratio steering device |
| JP2007151251A (en) * | 2005-11-25 | 2007-06-14 | Jtekt Corp | Motor control device and electric power steering device |
| JP2008179182A (en) * | 2007-01-23 | 2008-08-07 | Toyota Motor Corp | Power supply control device and method therefor |
| JP2014172491A (en) * | 2013-03-08 | 2014-09-22 | Jtekt Corp | Electric power steering device |
| CN104426432A (en) * | 2013-08-19 | 2015-03-18 | 苏州市智盈电子技术有限公司 | Control circuit for DC vehicle-mounted compressor |
| CN105584520B (en) * | 2014-11-17 | 2018-09-11 | 比亚迪股份有限公司 | The steering power system and its control method of electric vehicle |
| CN105346593B (en) * | 2015-12-04 | 2017-09-26 | 广西玉柴机器股份有限公司 | Electric boosting steering system |
| CN205997827U (en) * | 2016-08-31 | 2017-03-08 | 安徽纳威光机电科技发展有限公司 | A kind of have the Electro-Hydraulic Power Steering System that high-low pressure supplies power conversion circuit |
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Address after: 230031 Room 525, High-tech Group Building, 626 Huangshan Road, Hefei High-tech Zone, Anhui Province Applicant after: ANHUI LEGUAN INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 230031 Room 525, High-tech Group Building, 626 Huangshan Road, Hefei High-tech Zone, Anhui Province Applicant before: ANHUI NAWEIGUANG MECHANICAL AND ELECTRICAL TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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Denomination of invention: An electronically controlled hydraulic power steering system with high and low voltage power supply conversion circuit Effective date of registration: 20210407 Granted publication date: 20210219 Pledgee: Anhui Zhongying Shengda Financing Guarantee Co.,Ltd. Pledgor: ANHUI LEGUAN INTELLIGENT TECHNOLOGY Co.,Ltd. Registration number: Y2021340000004 |
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Date of cancellation: 20220401 Granted publication date: 20210219 Pledgee: Anhui Zhongying Shengda Financing Guarantee Co.,Ltd. Pledgor: ANHUI LEGUAN INTELLIGENT TECHNOLOGY CO.,LTD. Registration number: Y2021340000004 |
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Denomination of invention: An electronically controlled hydraulic power steering system with high and low voltage power supply conversion circuit Effective date of registration: 20220424 Granted publication date: 20210219 Pledgee: Anhui Zhongying Shengda Financing Guarantee Co.,Ltd. Pledgor: ANHUI LEGUAN INTELLIGENT TECHNOLOGY CO.,LTD. Registration number: Y2022340000004 |
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Date of cancellation: 20230508 Granted publication date: 20210219 Pledgee: Anhui Zhongying Shengda Financing Guarantee Co.,Ltd. Pledgor: ANHUI LEGUAN INTELLIGENT TECHNOLOGY CO.,LTD. Registration number: Y2022340000004 |