CN103693034A - Electro-hydraulic proportional valve control pump/motor hydraulic power assisted system of electric automobile - Google Patents
Electro-hydraulic proportional valve control pump/motor hydraulic power assisted system of electric automobile Download PDFInfo
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- CN103693034A CN103693034A CN201310293644.XA CN201310293644A CN103693034A CN 103693034 A CN103693034 A CN 103693034A CN 201310293644 A CN201310293644 A CN 201310293644A CN 103693034 A CN103693034 A CN 103693034A
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Abstract
The invention discloses an electro-hydraulic proportional valve control pump/motor hydraulic power assisted system of an electric automobile, which comprises a hydraulic drive circuit, a compound brake system and an electric controller. The hydraulic drive circuit comprises a hydraulic pump/motor, a high-pressure accumulator, a low-pressure accumulator, an electromagnetic directional valve, an electric-hydraulic proportional pressure reducing valve and the like. The brake system comprises a brake pedal, a brake master cylinder, a direct-control sequence valve, a displacement sensor and the like. The hydraulic pump/motor is coupled with a power motor and a drive axle through a transfer case. When brake is performed, the hydraulic pump is driven by the inertia of the automobile to prefill the high-pressure accumulator, and a brake force is generated on the automobile by the drive torque of the pump. When emergency brake is performed, high-pressure oil is exported by the brake master cylinder to enter a brake cylinder, and the brake force is generated by the brake cylinder and the hydraulic pump together. When the automobile starts or is accelerated, if the current of the motor is out of limit, torque is output by the hydraulic motor to assist the motor in driving the automobile, the current of the motor is reduced, the discharge rate of a power battery is reduced, and the service life of the battery is prolonged.
Description
Technical field
The present invention relates to a kind of electronlmobil Electro-hydraulic Proportional Control pump/motor hydraulic booster system, belong to hydraulic transmission technology field.
Background technology
In order to save the energy and protection of the environment, in recent years, new-energy automobile has become the strategic emphasis of countries in the world automobile industry development, and wherein, electronlmobil receives much concern as main technical schemes.The major technique obstacle of Development of EV is power accumulator technology at present.As the propulsion source of automobile, capacity is electrokinetic cell performance figure of paramount importance.Cell capacity is not fixed number, and especially charge-discharge magnification is relevant with the service condition of battery for it.Too high charge-discharge magnification can obviously reduce capacity of cell and service life cycle, therefore, in actual use, the charge-discharge magnification of battery is strictly controlled, and existing electrokinetic cell can't well adapt to the requirements of operating mode to instantaneous large-current such as vehicle launch, climbing.
At present, electronlmobil compares still with fuel-engined vehicle at aspects such as dynamic property, continual mileages that there is a big difference, can only be used as city or some short distance traffic instruments.A distinguishing feature of city road conditions is that vehicle start and stop are frequent, and this can recycle car brakeing becomes possibility.There is researcher to adopt the anti-method recovery braking energy that drags electric power generation directly to charge a battery of vehicle.The advantage of this method is that hardware configuration is simple, and shortcoming is that battery receives the effect of instantaneous large-current bad, and the braking energy percent recovery is not high.The transient high-current producing while also having scholar to utilize super capacitor to absorb car brakeing.Single from technical performance, super capacitor coordinates storage battery a kind of desirable energy array configuration really, but super capacitor is still lacked competitiveness in price and use cost at present, realizes industrialization and needs time.
Summary of the invention
For above-mentioned deficiency, order of the present invention proposes a kind of electronlmobil hydraulic booster system.Hydraulic system power density is large, adapts to the large feature of electronlmobil start and stop stage instantaneous power.During car brakeing, can utilize vehicle inertia power to drive Hydraulic Pump that vehicle energy is converted into hydraulic energy is stored in hydraulic accumulator.When vehicle start or acceleration, then drive HM Hydraulic Motor to motor power-assisted with the hydraulic energy in energy storage.Because there is hydraulic pressure auxiliary power unit to play power buffer action between driven by power and vehicle, can reduce the instantaneous charge-discharge magnification of electrokinetic cell.
Electronlmobil hydraulic booster system comprises hydraulic drive circuit, composite braking system, electric controller and part-time case.
Described driving loop comprises hydraulic pump/motor, high pressure accumulator, low pressure accumulator, by pass valve, solenoid directional control valve, pressure sensor and electro-hydraulic proportional reducing valve.The transmission shaft of hydraulic pump/motor is connected with the drive axle of power motor, automobile through part-time case, and the oil inlet and outlet of hydraulic pump/motor is connected with A, the B hydraulic fluid port of solenoid directional control valve respectively, and the P of solenoid directional control valve, T hydraulic fluid port are connected with high pressure and low pressure accumulator respectively.By pass valve is in parallel with hydraulic pump/motor.Pressure sensor is connected on high pressure accumulator export pipeline, and the output signal line of pressure sensor connects electric controller.Three hydraulic fluid ports of electro-hydraulic proportional reducing valve are connected with the displacement control hydraulic fluid port of high pressure accumulator, low pressure accumulator and hydraulic pump/motor respectively, and the input signal cable of electro-hydraulic proportional reducing valve is connected with electric controller.
Described brake system comprises brake pedal, master brake cylinder, hydraulic accumulator, one way sequence valve and displacement pickup.Brake pedal and brake master cylinder piston bar are hinged.Master brake cylinder oil outlet is connected with buffering hydraulic energy storage, one way sequence valve oil inlet.One way sequence valve oil outlet connects the brake wheel cylinder of automobile.Master brake cylinder arranges displacement pickup.
Principle of work
Damped condition
During car brakeing, step on brake pedal, brake master cylinder piston moves right, and its output fluid enters buffering hydraulic energy storage, and master brake cylinder pressure steadily rises.Now, master brake cylinder displacement pickup sends displacement signal to electric controller, and electric controller sends command signal, and that electromagnet DT3 is obtained is electric, solenoid directional control valve commutation, and I hydraulic fluid port, the O hydraulic fluid port of hydraulic pump/motor are connected with low, high pressure accumulator respectively, are pump operating mode.Now, electric controller sends voltage signal to electro-hydraulic proportional reducing valve, and signal voltage and master brake cylinder displacement are proportional, and electro-hydraulic proportional reducing valve delivery pressure and applied signal voltage are proportional, therefore hydraulic pump/motor discharge capacity and master brake cylinder displacement are proportional, proportional with brake-pedal travel.Like this, when push down on the pedal, the increase of just starting from scratch of the discharge capacity of hydraulic pump/motor.The discharge capacity of hydraulic pump/motor increases increases its input torque, and automobile sport resistance increment, increases the braking force of vehicle.Hydraulic pump/motor pumps into high pressure accumulator from low pressure accumulator inhalant liquid force feed, is equivalent to that vehicle energy is converted into hydraulic energy and is stored in energy storage.Continue downward pedal, master brake cylinder pressure further raises, and when pressure reaches one way sequence valve settling pressure, sequence valve is opened, and pressure oil enters brake wheel cylinder.Now, the braking force being produced by hydraulic pump/motor and brake wheel cylinder braking force act on simultaneously and form composite brakig.Braking procedure finishes, loosen the brake, and brake master cylinder piston playbacks under action of the spring, and pressure of wheel cylinder discharges, electro-hydraulic proportional reducing valve delivery pressure back to zero, hydraulic pump/motor discharge capacity is back to zero also, and brake action disappears.
Power-assisted operating mode
During vehicle launch because inertia load affects, the multiplication of power motor electric current moment, current sensor is passed to electric controller by current detection signal.When current amplitude reaches setting value, electric controller sends command signal to electromagnet DT2, solenoid directional control valve commutation, and O hydraulic fluid port, the I hydraulic fluid port of hydraulic pump/motor are connected with low, high pressure accumulator respectively, and hydraulic pump/motor becomes motor operating mode.Now, electric controller sends voltage signal to electro-hydraulic proportional reducing valve, and the increase of reducing valve delivery pressure increases hydraulic pump/motor discharge capacity.Reducing valve delivery pressure and motor drive current are proportional, and hydraulic pump/motor discharge capacity is proportional with control oil pressure, therefore motor displacement and current of electric are proportional.Motor displacement increase increases its output torque, and vehicle power increases, and therefore motor load reduces, thereby also makes its drive current reduce.When current of electric returns to setting value, electric controller output voltage will remain unchanged, and system is in metastable state.When electric current is reduced to setting value when following, electric controller output voltage makes zero, hydraulic pump/motor discharge capacity back to zero, and vehicle is driven separately by motor.In fluid motor-driven vehicle process, the high-pressure oil flow being stored in high pressure accumulator returns to low pressure accumulator through hydraulic pump/motor, and the energy reclaiming during car brakeing is released.High pressure accumulator is emptying, for brake accumulation of energy next time, prepares.
Feature of the present invention
1. when assistive drive, the direct dynamo-electric current control hydraulic proportional of electricity consumption pump capacity, system need not manual intervention just can be made rapid reaction to the variation of current of electric, thereby can obtain higher current control precision.
2. machine liquid composite brakig has retained original mechanical braking sytem, separately sets up a hydraulic braking energy regeneration brake system.During non-emergent braking, only have hydraulic braking to work, during emergency braking, two cover systems act on simultaneously, and its sequence of operation is converted to hydraulic coupling by brake-pedal travel and controls, simple to operate, easy to adjust.
3. define the level pump/motor and apportioning valve proportion of composing pump/motor replace imported proportioning pump, manufacturing cost is lower.
4. electric-hydraulic proportion pump/motor regulates, proofreaies and correct conveniently than pure hydraulic control pump/motor, is convenient to use various control policies, is applicable to the situation that controller performance is had relatively high expectations.
Accompanying drawing explanation
Fig. 1 is electronlmobil hydraulic booster system schematic diagram
Mark in figure: 1. change-speed box, 2. motor, 3. part-time case, 4. hydraulic pump/motor, 5. electric controller, 6. by pass valve, 7. electro-hydraulic proportional reducing valve, 8. solenoid directional control valve, 9. high pressure accumulator, 10. low pressure accumulator, 11. pressure sensors, 12. one way sequence valves, 13. displacement pickups, 14. energy storages, 15. master brake cylinders, 16. current sensors, 17. brake pedals
The specific embodiment
Electronlmobil hydraulic booster system comprises hydraulic drive circuit, composite braking system and electric controller.Machine-liquid energy conversion element that hydraulic pump/motor 4 is hydraulic booster system, it is connected with change-speed box 1 with power motor 2 through part-time case 3.
Described driving loop comprises hydraulic pump/motor 4, high pressure accumulator 9, low pressure accumulator 10, by pass valve 6, solenoid directional control valve 8, pressure sensor 11 and electro-hydraulic proportional reducing valve 7.The oil inlet and outlet of hydraulic pump/motor 4 is connected with A, the B hydraulic fluid port of solenoid directional control valve 8 respectively by oil pipe, and the P of solenoid directional control valve 8, T hydraulic fluid port are connected with high pressure accumulator 9 and low pressure accumulator 10 respectively.By pass valve 6 is in parallel with hydraulic pump/motor 4.Pressure sensor 11 is connected with high pressure accumulator 9, and the output signal line of pressure sensor 11 connects electric controller 5.The oil inlet of electro-hydraulic proportional reducing valve 7 connects high pressure accumulator 9, return opening connects low pressure accumulator 10, and oil outlet meets the displacement control hydraulic fluid port K of hydraulic pump/motor 4, and electro-hydraulic proportional reducing valve 7 input signal cables are connected with electric controller 5.
Described brake system comprises brake pedal 17, master brake cylinder 15, energy storage 14, one way sequence valve 12 and displacement pickup 13.Brake pedal 17 connects the piston rod of master brake cylinder 15.The oil outlet of master brake cylinder 15 is connected with energy storage 14, one way sequence valve 12 oil inlets.One way sequence valve 12 oil outlets connect the brake wheel cylinder of automobile.On master brake cylinder 15, establish displacement pickup 13.
System Working Principle is as follows
As Fig. 1, described hydraulic booster system, by part-time case 3 and motor 2 and change-speed box 1 power coupling, flows to according to power coupling, hydraulic booster system can be divided into following three kinds of operating modes
Damped condition
During car brakeing, step on brake pedal 17, the piston of master brake cylinder 15 moves right, and master brake cylinder 15 output fluid enter energy storage 14, make its pressure rise.When above-mentioned master brake cylinder 15 moves, its displacement pickup 13 sends displacement signal to electric controller 5,5 of electric controllers send command signal, and that electromagnet DT3 is obtained is electric, solenoid directional control valve 8 commutations, the hydraulic fluid port I of hydraulic pump/motor 4 is connected with high pressure accumulator 9 with low pressure accumulator 10 respectively through solenoid directional control valve 8 with hydraulic fluid port O.Hydraulic pump/motor 4 is driven the fluid of low pressure accumulator 10 is pumped into high pressure accumulator 9 by vehicle inertia, and vehicle energy is converted into pressure energy, and the input torque of hydraulic pump/motor 4 is the brake torque to vehicle.The input torque of hydraulic pump/motor 4 is directly proportional to its discharge capacity, when above-mentioned master brake cylinder 15 moves, the output signal of displacement pickup 13 is controlled the delivery pressure of electro-hydraulic proportional reducing valve 7 after electric controller 5 amplifies processing, the delivery pressure of the discharge capacity of hydraulic pump/motor 4 and electro-hydraulic proportional reducing valve 7 is proportional, the displacement of the delivery pressure of electro-hydraulic proportional reducing valve 7 and master brake cylinder 15 is proportional, therefore the displacement of the discharge capacity of hydraulic pump/motor 4 and master brake cylinder 15 is proportional, proportional with the stroke of brake pedal 17.Like this, when push down on the pedal 17, the increase of just starting from scratch of the discharge capacity of hydraulic pump/motor 4.In the situation that operation pressure is constant, pump capacity increases will make its input torque increase, and the brake torque of vehicle be increased.Therefore,, while stepping on brake pedal, braking force increases with pedal stroke is linear.In addition, along with energy storage 14 pressure raise, treadle effort is and then linear increase also, and road feel is obvious.Hydraulic pump/motor 4 pumps into high pressure accumulator 9 from low pressure accumulator 10 inhalant liquid force feeds, is equivalent to that vehicle energy is converted into hydraulic energy and is stored in energy storage.When needs emergency braking, firmly step on brake pedal 17, master brake cylinder 15 strokes expand, and energy storage 10 pressure raise, and when pressure reaches the settling pressure of one way sequence valve 12, sequence valve 12 is opened, and pressure oil enters brake wheel cylinder.Now, hydraulic braking and mechanical braking act on formation composite brakig simultaneously.Braking procedure finishes, loosen the brake 17, and master brake cylinder 15 pistons reset under action of the spring, and brake wheel cylinder discharges, electro-hydraulic proportional reducing valve 7 delivery pressure back to zeros, hydraulic pump discharge is back to zero also, and brake action disappears.
Power-assisted operating mode
When vehicle starts because inertia load affects, motor 2 electric current moment multiplication, current amplitude is detected and is passed to electric controller 5 by current sensor 16.When current amplitude reaches setting value, electric controller 5 sends command signal to electromagnet DT2, solenoid directional control valve 8 commutations, and the hydraulic fluid port O of hydraulic pump/motor 4 is connected with high pressure accumulator 9 with low pressure accumulator 10 respectively through solenoid directional control valve 8 with hydraulic fluid port I.Hydraulic pump/motor 4 is in motor operating mode.Now, electric controller 5 sends voltage signal to electro-hydraulic proportional reducing valve 7, and its delivery pressure increases and hydraulic pump/motor 4 discharge capacities are increased.Electro-hydraulic proportional reducing valve 7 delivery pressures and motor 2 drive currents are proportional, and hydraulic pump/motor 4 discharge capacities are proportional with control oil pressure, therefore proportional with power motor electric current.Pump/motor 4 discharge capacity increases increase its output torque, and vehicle power increases, and motor 2 loads reduce, and drive current reduces, and when motor 2 electric currents return to setting value, electric controller 5 output voltages will remain unchanged, and system is in metastable state.Vehicle enters to be stablized after motoring condition, and motor 2 electric currents are reduced in setting value, electric controller 5 output voltage back to zeros, and hydraulic pump/motor 4 discharge capacity back to zeros, vehicle is by motor 2 individual drive.Hydraulic pump/motor 4 drives in vehicle process, and the high-pressure oil flow being stored in high pressure accumulator 9 returns to low pressure accumulator 10 through hydraulic pump/motor 4, and the energy reclaiming during car brakeing discharges.High pressure accumulator 9 is emptying, waits for accumulation of energy while next time braking.
In when reversing, if motor 2 electric currents exceed setting value hydraulic efficiency pressure system also can power-assisted.Now, electric controller 5 sends command signal to electromagnet DT3, and the hydraulic fluid port I of hydraulic pump/motor 4 is connected with high pressure accumulator 9 with low pressure accumulator 10 respectively through solenoid directional control valve 8 with hydraulic fluid port O, and turning to while moving ahead with vehicle of hydraulic pump/motor 4 is contrary.
Dry run operating mode
If motor 2 electric currents do not reach the setting value that starts hydraulic booster system when vehicle moves ahead, and vehicle do not have braking maneuver, 5 couples of electromagnet DT2 of electric controller, the output of DT3 no signal, and solenoid directional control valve 8 will be in meta.Two hydraulic fluid ports of hydraulic pump/motor 4 are communicated with through solenoid directional control valve 8.During vehicle operating, hydraulic pump/motor 4 dallies under the drive of part-time case 3.
Claims (4)
1. an electronlmobil Electro-hydraulic Proportional Control pump/motor hydraulic booster system, is characterized in that:
Comprise hydraulic drive circuit, brake system and electric controller;
Described driving loop comprises hydraulic pump/motor (4), high pressure accumulator (9), low pressure accumulator (10), by pass valve (6), solenoid directional control valve (8), pressure sensor (11) and electric liquid electro-hydraulic proportional reducing valve (7); The oil inlet and outlet of hydraulic pump/motor (4) is connected with A, the B hydraulic fluid port of solenoid directional control valve (8) respectively, and the P of solenoid directional control valve (8), T hydraulic fluid port are connected with high pressure accumulator (9) and low pressure accumulator (10) respectively; By pass valve (6) is in parallel with hydraulic pump/motor (4); Pressure sensor 11 is connected with high pressure accumulator (9), and the output signal line of pressure sensor (11) connects electric controller (5); The oil inlet of electro-hydraulic proportional reducing valve (7) connects high pressure accumulator (9), return opening connects low pressure accumulator (10), oil outlet meets the displacement control hydraulic fluid port K of hydraulic pump/motor (4), and electro-hydraulic proportional reducing valve (7) input signal cable is connected with electric controller (5);
Described brake system comprises brake pedal (17), master brake cylinder (15), energy storage (14), one way sequence valve (12) and displacement pickup (13); Brake pedal 17 connects the piston rod of master brake cylinder (15); The oil outlet of master brake cylinder (15) is connected with energy storage (14), one way sequence valve (12) oil inlet; One way sequence valve (12) oil outlet connects the brake wheel cylinder of automobile; On master brake cylinder (15), establish displacement pickup (13).
2. electronlmobil hydraulic booster system according to claim 1, is characterized in that: described hydraulic pump/motor (4), for deciding grade and level pump/motor, is used in conjunction with electro-hydraulic proportional reducing valve (7); Also direct adoption rate pump/motor.
3. electro-hydraulic proportional reducing valve (7) according to claim 2, is characterized in that: be threeway electro-hydraulic proportional reducing valve.
4. electronlmobil hydraulic booster system according to claim 1, is characterized in that: described energy storage (14) is diaphragm type energy storage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310293644.XA CN103693034A (en) | 2013-07-15 | 2013-07-15 | Electro-hydraulic proportional valve control pump/motor hydraulic power assisted system of electric automobile |
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| CN201310293644.XA CN103693034A (en) | 2013-07-15 | 2013-07-15 | Electro-hydraulic proportional valve control pump/motor hydraulic power assisted system of electric automobile |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105946837A (en) * | 2016-06-29 | 2016-09-21 | 吉林大学 | Electronic hydraulic braking system with multiple working modes |
| CN106320421A (en) * | 2016-08-31 | 2017-01-11 | 徐州徐工挖掘机械有限公司 | Rotary energy recycling system for excavator |
| CN107415913A (en) * | 2017-07-14 | 2017-12-01 | 江苏大学 | A kind of active brake system for realizing automatic emergency brake |
| CN107585021A (en) * | 2017-07-14 | 2018-01-16 | 董博 | Manual car ramp starting auxiliary device |
| CN115352419A (en) * | 2022-08-23 | 2022-11-18 | 中国人民解放军陆军装甲兵学院 | Hydraulic control system and method for snow pressing vehicle capable of recycling braking energy |
| CN116039593A (en) * | 2023-02-17 | 2023-05-02 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105946837A (en) * | 2016-06-29 | 2016-09-21 | 吉林大学 | Electronic hydraulic braking system with multiple working modes |
| CN106320421A (en) * | 2016-08-31 | 2017-01-11 | 徐州徐工挖掘机械有限公司 | Rotary energy recycling system for excavator |
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| CN115352419B (en) * | 2022-08-23 | 2024-04-16 | 中国人民解放军陆军装甲兵学院 | Hydraulic control system and method for snow pressing vehicle capable of recycling braking energy |
| CN116039593A (en) * | 2023-02-17 | 2023-05-02 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
| CN116039593B (en) * | 2023-02-17 | 2024-04-26 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
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Application publication date: 20140402 |