CN103253298A - Motor-driven hydraulic power assisted steering pump - Google Patents
Motor-driven hydraulic power assisted steering pump Download PDFInfo
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- CN103253298A CN103253298A CN2013101332014A CN201310133201A CN103253298A CN 103253298 A CN103253298 A CN 103253298A CN 2013101332014 A CN2013101332014 A CN 2013101332014A CN 201310133201 A CN201310133201 A CN 201310133201A CN 103253298 A CN103253298 A CN 103253298A
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Abstract
A motor-driven hydraulic power assisted steering pump comprises an electrical interface, a temperature sensor, an electronic control unit connected with the electrical interface and the temperature sensor, a driving circuit connected with the electronic control unit, a motor connected with the driving circuit and a gear pump connected with the motor. The electrical interface comprises a power source interface, an ignition signal input interface, a CAN (controller area network) bus interface and a steering angle speed signal input interface, the ignition signal input interface inputs ignition signals to the electronic control unit to control starting of the electronic control unit, the CAN bus interface provides traveling speed of an automobile, rotating speed of an engine and loading and updating information sent by an upper computer with loading software, and the steering angle speed signal input interface provides steering angle speed signals of the automobile in real time. The motor-driven hydraulic power assisted steering pump has the advantages that oil consumption is lowered, temperature compensation is realized, various modes can be configured to operate, and real-time fault detection and processing can be realized when the automobile travels.
Description
Technical field
The present invention relates to a kind of hydraulic power-assisted steering pump, particularly relate to a kind of motor-driven hydraulic power-assisted steering pump.Be used for automobile.
Background technology
In the prior art, mechanical type servo-steering pump is to provide power by driving engine.Situations such as this mechanical type servo-steering pump is when increasing along with engine speed, and power-assisted also increases accordingly, causes in the vehicle traveling process, and feel is heavy during low speed, and feel is unstable during high speed, safety is relatively poor, and oil consumption is higher.Electronlmobil is not owing to there is driving engine, and mechanical type servo-steering pump can't satisfy; Motor-driven servo-steering pump does not have the CAN bus.And substantially all have the CAN bus on the automobile at present, and so motor-driven servo-steering pump is difficult to coupling, cause failure message not export, can not in time remind chaufeur, be unfavorable for that also On-line Product detects, and wire harness is too much.As the hydraulic power-assisted steering pump, not temperature compensated function is not all right.Because hydraulic oil is along with temperature raises, performance changes, and needs to adjust motor speed and carries out temperature compensating.If the motor that adopts is brush motor, be unfavorable for safeguarding that the life-span is limited; Problems such as pure electric power-assisted steering apparatus is less because of power, can not be used for than the loaded vehicle type, exists in non helping hand output in the steering torque dead band, and feel is relatively poor.
Described mechanical type servo-steering pump exists safety relatively poor in a word, and oil consumption is higher, can not be applied to electronlmobil; The motor-driven steering pump of no CAN bus exists and is difficult to reminding alarm, detection difficult; Problems such as pure electric power-assisted steering apparatus exists power little, and feel is relatively poor.
Summary of the invention
Purpose of the present invention is in order to overcome the variety of problems that mechanical type servo-steering pump in the above-mentioned prior art, motor-driven steering pump and pure electric power-assisted steering apparatus exist, provide a kind of and can reduce oil consumption, temperature compensating is arranged, the hydraulic power-assisted steering pump that can be configured to the various modes operation and have fault detection real-time in the driving process and processing capacity.
The present invention to achieve the above object, a kind of motor-driven hydraulic power-assisted steering pump is provided, comprise electric interfaces, temperature sensor, with the electronic control unit that electric interfaces is connected with temperature sensor, the driving circuit that is connected with electronic control unit, the motor that is connected with driving circuit, the gear type pump that is connected with motor, the output of gear type pump are connected on the hydraulic circuit interface; Further, described electric interfaces comprises power interface, ignition signal input interface, CAN bus interface and deflection angle speed signal input interface; Described ignition signal input interface is to the startup of electronic control unit input igniting signal control electronic control unit; Described electronic control unit obtains automobile speed, engine speed and electronic control unit by the CAN bus interface and is connected and obtains loading and lastest imformation with the upper computer that loads software that has on being connected the CAN bus by the CAN bus interface; Described deflection angle speed signal input interface provides the deflection angle speed signal of automobile in real time to electronic control unit.
Described motor is brushless motor.
Described driving circuit comprises four switch power devices, sample circuit and two Hall elements in parallel.
Described electronic control unit is a micro controller system, it comprises feel figure computing module, the temperature compensating computing module is exported the rotating speed pi regulator that is connected jointly with feel figure computing module and temperature compensating computing module, the current PI regulating control that is connected with the rotating speed pi regulator.
Hydraulic power-assisted steering pump of the present invention has obvious improvement.
As above-mentioned structure of the present invention, because the electric interfaces that is connected with electronic control unit comprises the ignition signal input interface.Therefore, electronic control unit can start with ignition signal.So, as long as automobile start just has ignition signal to make the electronic control unit synchronous initiation.It is timely, stable, reliable that this starts electronic control unit.Make electronic control unit pass through the operation that driving circuit can be controlled motor in real time, carry out power-assisted in real time, reduced oil consumption.
As above-mentioned structure of the present invention, because the electric interfaces that is connected with electronic control unit comprises the CAN bus interface.Electronic control unit not only can obtain the speed of a motor vehicle, the engine speed of automobile by this CAN bus interface, and, be connected with the upper computer that loads software that has on being connected the CAN bus by the CAN bus interface.Therefore, upper computer can be loaded electronic control unit by the CAN bus interface or upgrades processing by the CAN bus.So the present invention has fault detection real-time in the driving process and processing capacity.
As above-mentioned structure of the present invention, because the electric interfaces that is connected with electronic control unit comprises deflection angle speed signal input interface.Therefore, can obtain the deflection angle speed signal of automotive operation in real time by this interface electronic control unit, adjust rotating speed of motor in real time with this.
As above-mentioned structure of the present invention, because the electric interfaces that is connected with electronic control unit comprises ignition signal input interface, CAN bus interface and deflection angle speed signal input interface.Therefore, the present invention has several different conditions, can be configured to the various modes operation.For example, can be made at least three kinds of operational modes carry out power-assisted: a, when having only ignition signal, take the motor fixed rotating speed to carry out power-assisted; B, have ignition signal and CAN bus signals (signal of sending from the CAN bus), the power-assisted of taking motor speed to change according to the speed of a motor vehicle; C, have ignition signal, CAN bus signals and deflection angle speed signal, the power-assisted of taking motor speed to change according to the speed of a motor vehicle and deflection angle speed.
As above-mentioned structure of the present invention, because comprise temperature sensor among the present invention, be used for measuring the oil temperature.The oily temperature that temperature sensor will record in real time passes to electronic control unit, and electronic control unit can carry out temperature compensating according to the variation of oil temperature, the power-assisted that control in real time changes.And comprise feel figure computing module in the electronic control unit, can change feel figure flexibly according to the demand of customization feel.
As above-mentioned structure of the present invention, described motor adopts brushless motor, can reduce the maintenance of motor cost, and maintenance is convenient, increases the life-span.In sum, the characteristics that the present invention has compact conformation, volume is less, weight is light, reduce oil consumption, temperature compensating, can be configured to the various modes operation and can carry out detection and the processing of fault when driving in real time.
Description of drawings
Fig. 1 is the structural representation of hydraulic power-assisted steering pump one embodiment of the present invention;
Fig. 2 is the structural representation of driving circuit one embodiment in the hydraulic power-assisted steering pump of the present invention;
Fig. 3 is the inner structure scheme drawing of electronic control unit one embodiment in the hydraulic power-assisted steering pump of the present invention;
Fig. 4 is brushless motor speed and speed of a motor vehicle performance diagram in the hydraulic power-assisted steering pump of the present invention;
Fig. 5 is brushless motor speed and deflection angle power speed curve figure in the hydraulic power-assisted steering pump of the present invention;
Fig. 6 is brushless motor speed and temperature characteristics figure in the hydraulic power-assisted steering pump of the present invention.
The specific embodiment
Further specify architectural feature of the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, hydraulic power-assisted steering pump of the present invention comprises electric interfaces 1, temperature sensor 2, the electronic control unit 3 that is connected with temperature sensor 2 with electric interfaces 1, the driving circuit 4 that is connected with electronic control unit 3, the motor 5 that is connected with driving circuit 4, the gear type pump 6 that is connected with motor 5, the output of gear type pump 6 is connected on the hydraulic circuit interface 7.Further, described electric interfaces 1 comprises power interface 11, ignition signal input interface 12, CAN bus interface 13 and deflection angle speed signal input interface 14.Described ignition signal input interface 12 is to the startup of electronic control unit 3 input igniting signal control electronic control units 3; Described electronic control unit 3 obtains automobile speed, engine speed and electronic control unit 3 by CAN bus interface 13 and is connected and obtains loading and lastest imformation with the upper computer that loads software that has on being connected the CAN bus by CAN bus interface 13; Described deflection angle speed signal input interface 14 provides the deflection angle speed signal of automobile in real time to electronic control unit 3.
In the present embodiment, described motor 5 is four phase permanent-magnet brushless motors.
Fig. 2 is the structural representation of driving circuit 4 one embodiment.As shown in Figure 2, in the present embodiment, driving circuit 4 comprises four switch power device K1, K2, K3, K4 in parallel, sample circuit R1, R2 and two Hall element N1, N2.As shown in Figure 2, driving circuit 4 one ends are motor interfaces 41, and the other end is control unit interface 42.Motor interface 41 is interfaces of driving circuit 4 and motor 5.It specifically is the winding terminal that switch power device K1, K2, K3, K4 are connected in four phase permanent-magnet brushless motors.Control unit interface 42 is interfaces of driving circuit 4 and electronic control unit 3.In the present embodiment, switch power device K1, K2, K3, K4 are that model is the BUK9E06-55A chip.Characteristics such as this chip has withstand voltage 55V, electric current reaches 75A, and conducting resistance is little are fit to the electric machine control system application.Hall element N1, N2 are that model is the sensor of TL935.Be used for gathering rotor field signal, motor speed signal, control motor commutation and rotating speed.Provide current signal (in the present embodiment, resistance R 1, R2 adopt 1 milliohm metallic resistor, and precision is 1%) by the resistance R 1 of series connection, the sample circuit that R2 constitutes for the motor closed loop control.
In the present embodiment, the concrete structure of electronic control unit 3 and principle of work are as shown in Figure 3.In the present embodiment, electronic control unit 3 is micro controller systems.As shown in Figure 3, it comprises feel figure computing module 31, and temperature compensating computing module 34 is with the feel figure computing module 31 rotating speed pi regulator 32 that 34 common outputs are connected with the temperature compensating computing module, the current PI regulating control 33 that is connected with rotating speed pi regulator 32.Rotating speed pi regulator 32 is connected with driving circuit 4 respectively with current PI regulating control 33.In the present embodiment, electronic control unit 3 model that adopts company of Infineon with said structure function to provide is the micro controller system (micro controller system is as the master controller chip) of XC164CM.
As shown in Figure 3, by speed of a motor vehicle v, deflection angle speed
Be input to feel figure computing module 31 and temperature T and be input to the common motor speed n that determines in temperature compensating computing module 34 backs
*Be input in the rotating speed pi regulator 32 with the real electrical machinery rotation speed n that records by Hall element (Fig. 2 shows) in the driving circuit 4, calculate the setting electric current I
*Set electric current I
*The actual motor current I measured with sample circuit (Fig. 2 shows) in the driving circuit 4 is input in the current PI regulating control 33, calculates the PWM dutycycle, and 5 operations of control motor realize brushless motor speed, current double closed-loop control system.Regulate flow and the pressure of hydraulic oil by rotating speed of motor and electric current, thereby obtain suitable power-assisted.
As above-mentioned, electronic control unit 3 adopts with micro controller system as the master controller chip.Be the automotive grade product, be widely used in automotive control system, superior performance.Dominant frequency has 40MHz, can realize the processing of high speed data computing and signal.Comprise that 10 precision analog digital modular converters carry out acquisition of signals such as power supply, electric current, temperature, PWM (Pulse-Width Modulation) module is by control duty ratio modulation motor phase windings terminal voltage, and the signal capture module is carried out the seizure of motor rotor position, Hall element signal and comprised the CAN bus module.Can satisfy design requirement of the present invention.
As above-mentioned, electronic control unit 3 is connected with the upper computer that loads software that has on being connected the CAN bus by CAN bus interface 13, can obtain loading or the lastest imformation of upper computer in real time.So having program, the present invention reloads the function that function and feel figure customize according to customer demand.
As above-mentioned, the present invention has real time fail monitoring and processing capacity in the driving process.As the message of electronic control unit 3 by the CAN bus signals, send detections such as mistake, check errors and the CAN bus failure whether occurs, whether detections such as the cycle by deflection angle speed signal, PWM, duty cycle range the angular velocity signal fault occurs, and the real-time sampling power line voltage judges whether fault such as under-voltage, over voltage and judge system by the resistance of the thermo-sensitive resistor in the CAN bus sampling automotive system whether temperature is high excessively.In case system's et out of order enters corresponding fail safe pattern, by sending diagnostic code to the car load control unit, in time remind chaufeur, the storage chip in the use system simultaneously stores failure code, in order to detect maintenance, has higher safety.
The present invention determines the pattern of hydraulic power-assisted steering pump operation according to the signal that electric interfaces 1 provides.In the present embodiment, can determine three kinds of operational mode: a at least, when having only ignition signal, take the motor fixed rotating speed to carry out power-assisted; B, when ignition signal and CAN bus signals, the power-assisted of taking motor speed to change according to the speed of a motor vehicle; C, when ignition signal, CAN bus signals and deflection angle speed signal, the power-assisted of taking motor speed to change according to the speed of a motor vehicle and deflection angle speed.
As above-mentioned, the motor in the hydraulic power-assisted steering pump of the present invention is brushless motor.Fig. 4 is brushless motor speed and speed of a motor vehicle performance diagram.Abscissa is speed of a motor vehicle v among Fig. 4, and ordinate is motor speed n.As shown in Figure 4, in deflection angle speed
Under certain situation, motor speed n changes along with the variation of speed of a motor vehicle v; Be 0 o'clock at v, in order to reduce noise, n is in a lower slightly rotating speed, and chaufeur can not feel that feel is overweight simultaneously; Along with v improves, n improves rapidly, and v keeps at low speed segment, obtains lighter feel; Along with v is higher than a certain setting speed of a motor vehicle, unstable in order to prevent feel, improve safety, the proportional decline of n; When being in more than the higher speed of a motor vehicle, motor is in minimum speed, and certain power-assisted namely is provided, and has higher-security again.Mathematic(al) representation is:
In the following formula, α is slope, and b is intercept.
Fig. 5 is brushless motor speed and deflection angle power speed curve figure.Among Fig. 5, abscissa is deflection angle speed
Ordinate is motor speed n.As shown in Figure 5, under the certain situation of speed of a motor vehicle v, the capability of fast response in order to turn to, motor speed n is with deflection angle speed
The ratio of being varied to changes, when
When being higher than certain value, for travel safety, motor is in maximum speed.Mathematic(al) representation is:
In the following formula, k is proportionality coefficient, and ω 1 is the cireular frequency setting value.
Fig. 6 is brushless motor speed and temperature characteristics figure.Among Fig. 6, abscissa is the temperature T of hydraulic oil, and ordinate is motor speed n.As shown in Figure 6, when the temperature T of hydraulic oil constantly raise, motor speed n changed the compensation of constantly carrying out with temperature T.In order to reduce to change because temperature traverse makes the hydraulic oil performance, the influence that output brings to power-assisted is adopted and is carried out certain rotating speed compensation in a certain section temperature.Temperature compensation curve as shown in Figure 6.Mathematic(al) representation is:
Claims (4)
1. motor-driven hydraulic power-assisted steering pump, comprise electric interfaces, temperature sensor, the electronic control unit that is connected with temperature sensor with electric interfaces, the driving circuit that is connected with electronic control unit, the motor that is connected with driving circuit, the gear type pump that is connected with motor, the output of gear type pump is connected on the hydraulic circuit interface; Further, described electric interfaces comprises power interface, ignition signal input interface, CAN bus interface and deflection angle speed signal input interface; Described ignition signal input interface is to the startup of electronic control unit input igniting signal control electronic control unit; Described electronic control unit obtains automobile speed, engine speed and electronic control unit by the CAN bus interface and is connected and obtains loading and lastest imformation with the upper computer that loads software that has on being connected the CAN bus by the CAN bus interface; Described deflection angle speed signal input interface provides the deflection angle speed signal of automobile in real time to electronic control unit.
2. motor-driven hydraulic power-assisted steering pump according to claim 1 is characterized in that described motor is brushless motor.
3. motor-driven hydraulic power-assisted steering pump according to claim 1 is characterized in that described driving circuit comprises four switch power devices, sample circuit and two Hall elements in parallel.
4. motor-driven hydraulic power-assisted steering pump according to claim 1, it is characterized in that described electronic control unit is a micro controller system, it comprises feel figure computing module, the temperature compensating computing module, export the rotating speed pi regulator that is connected jointly with feel figure computing module and temperature compensating computing module, the current PI regulating control that is connected with the rotating speed pi regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101332014A CN103253298A (en) | 2013-04-16 | 2013-04-16 | Motor-driven hydraulic power assisted steering pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101332014A CN103253298A (en) | 2013-04-16 | 2013-04-16 | Motor-driven hydraulic power assisted steering pump |
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| CN103253298A true CN103253298A (en) | 2013-08-21 |
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| CN2013101332014A Pending CN103253298A (en) | 2013-04-16 | 2013-04-16 | Motor-driven hydraulic power assisted steering pump |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104890722A (en) * | 2015-05-15 | 2015-09-09 | 郑州宇通客车股份有限公司 | Control method of electro-hydraulic power-assisted steering and system for implementing method |
| CN106585712A (en) * | 2017-01-27 | 2017-04-26 | 丽水市飞天人机械设计有限公司 | Electronic hydraulic power steering pump suitable for electric car |
| CN108177690A (en) * | 2018-01-08 | 2018-06-19 | 山西省电子工业科学研究所 | A kind of new energy sedan steering system controller |
| CN108284873A (en) * | 2018-02-13 | 2018-07-17 | 山西省电子工业科学研究所 | A kind of electro-hydraulic pump ECU with the identification of angular speed CAN bus data |
| CN109882392A (en) * | 2019-03-27 | 2019-06-14 | 山西省电子工业科学研究所有限公司 | A kind of 24V electric-controlled hydraulic power-assisted steering pump ECU |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1966333A (en) * | 2005-11-16 | 2007-05-23 | 株式会社日立制作所 | Power steering device |
| CN101378945A (en) * | 2005-12-23 | 2009-03-04 | Trw有限公司 | Power steering systems using electric motor with sensorless control |
| CN102923185A (en) * | 2012-11-12 | 2013-02-13 | 江苏大学 | Electronic control hydraulic power steering system controller and control method thereof |
| CN102951199A (en) * | 2011-08-09 | 2013-03-06 | 株式会社捷太格特 | Hydraulic power steering system |
| CN103010297A (en) * | 2011-09-27 | 2013-04-03 | 株式会社捷太格特 | Power steering system |
| CN203199021U (en) * | 2013-04-16 | 2013-09-18 | 中国电子科技集团公司第三十六研究所 | Motor-driven hydraulic power steering pump |
-
2013
- 2013-04-16 CN CN2013101332014A patent/CN103253298A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1966333A (en) * | 2005-11-16 | 2007-05-23 | 株式会社日立制作所 | Power steering device |
| CN101378945A (en) * | 2005-12-23 | 2009-03-04 | Trw有限公司 | Power steering systems using electric motor with sensorless control |
| CN102951199A (en) * | 2011-08-09 | 2013-03-06 | 株式会社捷太格特 | Hydraulic power steering system |
| CN103010297A (en) * | 2011-09-27 | 2013-04-03 | 株式会社捷太格特 | Power steering system |
| CN102923185A (en) * | 2012-11-12 | 2013-02-13 | 江苏大学 | Electronic control hydraulic power steering system controller and control method thereof |
| CN203199021U (en) * | 2013-04-16 | 2013-09-18 | 中国电子科技集团公司第三十六研究所 | Motor-driven hydraulic power steering pump |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104890722A (en) * | 2015-05-15 | 2015-09-09 | 郑州宇通客车股份有限公司 | Control method of electro-hydraulic power-assisted steering and system for implementing method |
| CN106585712A (en) * | 2017-01-27 | 2017-04-26 | 丽水市飞天人机械设计有限公司 | Electronic hydraulic power steering pump suitable for electric car |
| CN108177690A (en) * | 2018-01-08 | 2018-06-19 | 山西省电子工业科学研究所 | A kind of new energy sedan steering system controller |
| CN108177690B (en) * | 2018-01-08 | 2020-11-03 | 山西省电子工业科学研究所有限公司 | New energy car steering system controller |
| CN108284873A (en) * | 2018-02-13 | 2018-07-17 | 山西省电子工业科学研究所 | A kind of electro-hydraulic pump ECU with the identification of angular speed CAN bus data |
| CN109882392A (en) * | 2019-03-27 | 2019-06-14 | 山西省电子工业科学研究所有限公司 | A kind of 24V electric-controlled hydraulic power-assisted steering pump ECU |
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Application publication date: 20130821 |