CN203651750U - Hydraulic auxiliary driving and braking system - Google Patents

Hydraulic auxiliary driving and braking system Download PDF

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Publication number
CN203651750U
CN203651750U CN201320735018.7U CN201320735018U CN203651750U CN 203651750 U CN203651750 U CN 203651750U CN 201320735018 U CN201320735018 U CN 201320735018U CN 203651750 U CN203651750 U CN 203651750U
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China
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hydraulic
pressure
valve
energy storage
electromagnetic valve
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CN201320735018.7U
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Chinese (zh)
Inventor
李胜
柳兴林
翟德文
曲新强
王敏
刘彬娜
王秀鹏
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FAW Group Corp
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FAW Group Corp
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Abstract

The utility model discloses a hydraulic auxiliary driving and braking system. A power take-off unit, a hydraulic pump, two hydraulic motors, an energy storage device, two solenoid valves, a safety valve assembly, a proportional overflow valve, a heat exchanger, an oil tank and a control unit are added on the system on the basis of a traditional vehicle structure. Output force of an engine in a traditional vehicle structure is transmitted through a clutch, a transmission, a transmission shaft and a driving axle to be transmitted to rear wheels to drive a vehicle to run. The force take-off unit is connected between the output end of a driving accessory of the engine and the hydraulic pump, so that power of the engine can be transmitted to the hydraulic pump. A hydraulic circuit is formed by the hydraulic pump, the two hydraulic motors, the energy storage device and the proportional overflow valve through the two solenoid valves, and the two hydraulic motors are respectively arranged on two front wheels. The hydraulic auxiliary driving and braking system not only can improve passing performance of the vehicle on a bad rod face, but also can ensure stability of long slope brake, and meanwhile achieves braking energy recovery.

Description

Hydraulic pressure assistive drive and brake system
Technical field
The utility model belongs to automobile hydraulic application technology field, relates to a kind of hydraulic pressure assistive drive and brake system and control method thereof that is applied to orthodox car.
Background technology
In recent years, along with the fast development of 21 century automobile industry, the application of quiet liquid drive technology in conventional truck obtains important breakthrough, aspect automobile energy-saving environmental protection, applying relevant hydraulic-driven technology, the fluid power coupling technology that forms hydraulic hybrid power system causes domestic and international research institution and automaker's great attention gradually.
The operating condition of the special vehiclees such as engineering truck and urban sanitation automobile such as traditional commercial truck, heavy duty truck, tractor truck is complicated and changeable; the engineering trucks such as heavy duty truck many on bad road surface of country or road surface, mine, Chang Po under road surface, travel; and the rugged degree in these road surfaces is larger; adhesion value is generally less; the phenomenon that vehicle often there will be drive wheel to skid, affects dynamic property and the crossing ability of car load.The special vehiclees such as urban sanitation automobile frequent low speed driving and need frequent start-stop under the working condition of city, engineering truck also often runs into the situation of lower long slope, long-time service brake, at this moment need to use continuously or frequently running brake, cause brake wear serious, make the easy get out of hand of brake system, not only reduce the service life of running brake, also had a strong impact on travel safety.
Traditional machine driven system not only can not well adapt to operating mode complicated and changeable, has the problem that fuel oil consumption is larger simultaneously.Although hydraulic hybrid power system can reduce fuel oil consumption, part is improved the dynamic property of conventional truck, but it can not adapt to operating mode complicated and changeable, simultaneously larger to changing of design, control algorithm complexity, cost of development is high, is not adapted at applying on the special vehicle such as the engineering trucks such as traditional commercial truck, heavy duty truck, tractor truck and urban sanitation automobile.Simultaneously, although hydraulic hybrid power system can be realized part braking energy and reclaim, but in the time that the capacity of vehicle long slope braking and energy storage has been expired, now in common hydraulic hybrid power system, brake recovery system inoperative, car brakeing can only rely on traditional friction braking, and traditional friction braking is not easy to control the stable of braking force, have a strong impact on service brake safety.So how simple and convenient adaptability for working condition and the insensitivity that improves vehicle by hydraulic booster system just has good application prospect.Chinese patent application publication No. CN102358163A, denomination of invention is " hub hydraulic motor driving system ", proposed a kind of hydraulic hybrid drive pattern for the poor problem of commercial vehicle/comm..vehicle crossing ability on bad road surface, but it does not consider vehicle braking performances and power saving; Denomination of invention is " proportional valve control pump type middle low power retarder for vehicles ", publication number is that the patent application of CN101565038A proposes a kind of hydraulic resistance retarder to improve vehicle braking performances, this structure can fine raising vehicle brake efficiency and insensitivity, but this retarder has been wasted kinetic energy and the braking energy of vehicle.
Thereby, how to provide the one can effective guarantee deceleration and stopping performance and energy-conservation, adapt to again operating mode complicated and changeable hydraulic booster system just become problem demanding prompt solution.
Utility model content
The purpose of this utility model is to operating condition complicated and changeable for special vehiclees such as the engineering trucks such as heavy duty truck and urban sanitation automobiles, tradition machine driven system adaptability for working condition and the poor problem of fuel economy, propose a kind of a set of hydraulic pressure assistive drive and brake system that can improve vehicle working condition comformability and fuel economy of adding on the architecture basics of traditional machine driven system.
The technical solution adopted in the utility model is as follows:
A kind of hydraulic pressure assistive drive and brake system, comprising: power takeoff, Hydraulic Pump, the first and second electromagnetic valves, proportional pressure control valve, energy storage, safety valve group, HM Hydraulic Motor, H Exch, oil tank and control unit, wherein,
The input shaft of described power takeoff is connected with the output shaft of engine drive annex (cooling fan etc.) with the rotor shaft of described Hydraulic Pump respectively with output shaft, and described driving engine drives the rotation of described Hydraulic Pump by described power takeoff; Described the first electromagnetic valve is connected with oil inlet and described second electromagnetic valve of the oil outlet of described Hydraulic Pump, described oil tank, described safety valve group respectively;
The oil inlet of described HM Hydraulic Motor is connected with the oil outlet of described safety valve group and the oil inlet of described high pressure controllable capacity pump respectively with oil outlet;
Described the second electromagnetic valve is connected with the oil inlet of energy storage, proportional pressure control valve respectively;
The oil outlet of described proportional pressure control valve is connected with the oil inlet of described H Exch;
The oil outlet of described H Exch connects described oil tank;
Described control unit is connected with described high pressure controllable capacity pump, the first electromagnetic valve, the second electromagnetic valve, proportional pressure control valve, energy storage.
Between the output shaft of the input shaft of described power takeoff and described engine drive annex, adopt spline pair to be connected; Between the output shaft of described power takeoff and described cylinder block of hydraulic pumps axle, adopt spline pair to be connected, or adopt flange to connect or the connection of short universal-joint.
Described the first electromagnetic valve is three-position four-way valve, and described the second electromagnetic valve is two position three-way valve.
The Median Function of described three-position four-way valve is " U " type, P, T sealing, and A and B connect; P mouth, A mouth and the B mouth of described three-position four-way valve is connected with the oil inlet of the oil outlet of described Hydraulic Pump, described safety valve group and with the P mouth of described two position three-way valve respectively by pressure piping;
The T mouth of described three-position four-way valve is connected with described oil tank by low pressure pipeline.
A mouth, the B mouth of described the second electromagnetic valve are connected with the oil inlet of energy storage, proportional pressure control valve respectively by pressure piping;
The oil inlet of described HM Hydraulic Motor is connected with the oil outlet of described safety valve group and the oil inlet of described Hydraulic Pump by pressure piping respectively with oil outlet;
The oil outlet of described proportional pressure control valve is connected with the oil inlet of described H Exch by low pressure pipeline;
The oil outlet of described H Exch is connected with described oil tank by low pressure pipeline.
The P-A passage of described Hydraulic Pump and described HM Hydraulic Motor, safety valve group, the first electromagnetic valve forms the first hydraulic pressure assistive drive loop;
The P-B passage of described Hydraulic Pump and described the first electromagnetic valve, the P-A passage of the second electromagnetic valve, energy storage form hydraulic braking energy recovery circuit;
Described proportional pressure control valve, H Exch and oil tank three are connected in series, form hydraulic cushion brake circuit with described Hydraulic Pump, the P-A passage of the first electromagnetic valve, the P-B passage of the second electromagnetic valve;
A-B passage, the P-A passage of the second electromagnetic valve, safety valve group, the HM Hydraulic Motor of described energy storage and described the first electromagnetic valve form the second hydraulic pressure assistive drive loop.
Described proportional pressure control valve is adjusted pressure by controlling electric liquid, and its oil pressure relief scope is 0-40MPa.
Described three position four-way electromagnetic valve, two-position three way magnetic valve are handled and spring reset by electromagnet, and the operating temperature of described H Exch is 40-60 ℃.
Described Hydraulic Pump is axial plunger high pressure controllable capacity pump, and its work top pressure is 40MPa; Described HM Hydraulic Motor is 2 radial plunger high pressure fixed displacement motors that structure is identical, and the semiaxis of its rotor shaft and front-wheel is same axis, with bolts with the wheel hub of two front-wheels respectively.
Compared with prior art the beneficial effects of the utility model are:
1. the high pressure controllable capacity pump and the hydraulic pressure fixed displacement motor that in system described in the utility model, adopt are hydraulic pressure primary element, and compared with motor, when specific power is large, the little quality of volume is light, and compared with hydraulic secondary component, cost is low, arrange that mounting structure is simple.
2. system described in the utility model is compared with conventional truck, and operating mode is adaptable, dynamic property and crossing ability can significantly improve vehicle and travel on bad road surface time.
3. system described in the utility model, compared with conventional truck, can be guaranteed on the stable basis of braking force, braking energy to be reclaimed in the time of car brakeing, is conducive to energy-conservation; While, in the time cannot realizing braking energy recovery, still can guarantee that the braking force of vehicle long slope braking is stable, and when raising vehicle is braked for a long time, the stability of brake efficiency, is conducive to service brake safety.
4. system described in the utility model, compared with conventional truck, can kill engine in the time of low vehicle speeds, drives separately vehicle by energy storage, realizes the recycling of braking energy; Avoid driving engine in the high some work of the fuel oil consumption of slow speed of revolution low torque simultaneously, reduced the fuel oil consumption of vehicle, improved the capacity usage ratio of vehicle.
5. system described in the utility model is that addition portion divides Hydraulic Elements to form a set of hydraulic efficiency pressure system on the mechanical transmission structure basis of existing conventional truck, change hardly the structure of former vehicle, compared with hydraulic hybrid power system, changing of design is less, changes cost low.
6. the quiet liquid hydrostatic drive that system described in the utility model adopts has higher safety compared with the high potential control-driven system of motor.
The function that the utility model has increased Hydraulic Pump, proportional pressure control valve, energy storage is to increase slow braking on original assistant drive system, and this belongs to the relatively idea of innovation.In addition, adopt the recovery of primary element Hydraulic Pump as braking energy, and the object of assistive drive and slow braking is different, this is also an innovative point of the present utility model.
In the response structure that system is added, comprising of particular design: being connected between power takeoff and engine drive annex mouth adopts spline pair to connect, being connected according to the requirement of actual arrangement bulk between power takeoff and the rotor shaft of Hydraulic Pump, adopt spline pair, flange or short universal-joint to connect; The rotor shaft of HM Hydraulic Motor and the semiaxis of front-wheel belong to same axis, and with bolts with the wheel hub of front-wheel.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of hydraulic pressure assistive drive described in the utility model and brake system;
Fig. 2 is hydraulic pressure assistive drive described in the utility model and the power transmission line figure of brake system under the independent drive pattern of driving engine;
Fig. 3 is that hydraulic pressure assistive drive described in the utility model and brake system are combined the power transmission line figure under drive pattern at driving engine with controllable capacity pump;
Fig. 4 is that hydraulic pressure assistive drive described in the utility model and brake system are combined the power transmission line figure under drive pattern at driving engine with energy storage;
Fig. 5 is hydraulic pressure assistive drive described in the utility model and the power transmission line figure of brake system under the independent driving of driving engine and accumulator pressurizing pattern;
Fig. 6 is hydraulic pressure assistive drive described in the utility model and the power transmission line figure of brake system under the independent drive pattern of energy storage;
Fig. 7 is hydraulic pressure assistive drive described in the utility model and the power transmission line figure of brake system under energy storage braking energy take-back model;
Fig. 8 is hydraulic pressure assistive drive described in the utility model and the power transmission line figure of brake system under the slow braking mode of high pressure controllable capacity pump.
Fig. 9 is the diagram of curves that the vehicle tractive force of hydraulic pressure assistive drive described in the utility model and brake system increases ratio;
The vehicle climbable gradient of Figure 10 hydraulic pressure assistive drive described in the utility model and brake system increases the diagram of curves of ratio;
The control method diagram of circuit that the mode of operation of Figure 11 hydraulic pressure assistive drive described in the utility model and brake system switches;
The hydraulic pressure auxiliary braking control subalgorithm diagram of circuit that Figure 12 hydraulic pressure assistive drive described in the utility model and brake system mode of operation switch;
The hydraulic pressure assistive drive control subalgorithm diagram of circuit that Figure 13 hydraulic pressure assistive drive described in the utility model and brake system mode of operation switch;
(description of reference numerals)
1-driving engine; 2-power-transfer clutch; 3-change-speed box; 4-drive axle; 5-trailing wheel; 6-front-wheel; 7-power takeoff; 8-Hydraulic Pump; The 9-the first electromagnetic valve; The 10-the second electromagnetic valve; 11-proportional pressure control valve; 12-energy storage; 13-safety valve group; 14-HM Hydraulic Motor; 15-H Exch; 16-oil tank; 17-electronic control unit.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is elaborated.
Fig. 1 is the structure principle chart of hydraulic pressure assistive drive described in the utility model and brake system.In figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.As shown in Figure 1, system described in the utility model comprises hydraulic pressure assistive drive and the brake system of traditional machine driven system and interpolation.Traditional machine driven system comprises driving engine 1, power-transfer clutch 2, change-speed box 3, drive axle 4, trailing wheel 5 and front-wheel 6; Hydraulic pressure assistive drive and the brake system of adding comprises power takeoff 7, high pressure controllable capacity pump 8, the first electromagnetic valve 9, the second electromagnetic valve 10, proportional pressure control valve 11, energy storage 12, safety valve group 13,2 fixed displacement motors that structure is identical 14, H Exch 15, oil tank 16 and electronic control units 17.
Preferably, the first electromagnetic valve in the utility model can adopt second electromagnetic valve that can keep for a long time commutating in motionless three position four-way electromagnetic valve 9, the utility model can adopt the two-position three way magnetic valve 10 of convenience, practicality and power saving.
4 hole: P of three-position four-way valve represent pressure oil oil inlet, and T represents the oil suction of logical fuel tank or oil pump, and A, B represent the actuator port of the actuating units such as logical oil cylinder or oil motor.Three-position four-way valve has three control positioies, and spool is pushed left side to, and P and B are logical, and T and A are logical; Spool is pushed right side to, and P and A are logical, and T and B are logical.Spool is placed in midway location, different Median Functions, and each hydraulic fluid port is exchanged information different, and for " O " type three-position four-way valve, each hydraulic fluid port A, B, P, T are not connected.
With reference to figure 1, the energy that in system of the present utility model, driving engine 1 is exported has two bang paths, and one is mechanical power bang path, and another is hydraulic power bang path.Mechanical power bang path is the power transfer path of target vehicle (applying the existing conventional truck of system described in the utility model), system of the present utility model does not change installation site relation and the power transmission relationship between driving engine 1 in this path, power-transfer clutch 2, change-speed box 3, drive axle 4, trailing wheel 5 and front-wheel 6, does not change equally scantling of structure and the performance perameter of each parts.Take the mechanical transfer path of the heavy duty truck of a certain curb mass 9.2t as example, driving engine is that maximum output power is the WP12_375N diesel engine of 295KW; Power-transfer clutch is common normally closed diaphragm spring friction clutch; Change-speed box is the mechanical transmission of model 12JSD180TA; In drive axle, base ratio is 5.73; The static radius of forward and backward wheel is 544mm.
On the basis of above-mentioned mechanical power transferring structure, the power takeoff 7 adding, Hydraulic Elements comprise high pressure controllable capacity pump 8, the first electromagnetic valve 9, the second electromagnetic valve 10, proportional pressure control valve 11, energy storage 12, safety valve group 13, H Exch 15, oil tank 16 and 2 fixed displacement motors 14 that structure is identical, form new hydraulic power bang path.The all elements that add all can be selected existing product according to the requirement of target vehicle.
The power taking mode of power takeoff 7 is the output shaft end power taking of the direct driving accessory device from driving engine 1, structure is made up of two intermeshing driving and driven gear wheel shafts, power is inputted from the transmission of driving gear axle head, through the engaged transmission of driving and driven gear, export from the transmission of driven gear axle head, be that driving gear shaft is input shaft, driven gear is output shaft.
High pressure controllable capacity pump 8 is that the characteristic parameter calculating according to the dynamic property demand of target vehicle is chosen existing product on market with 2 identical fixed displacement motors 14 of structure.In example such as the heavy duty truck of above-mentioned 9.2t, the controllable capacity pump of choosing is that the discharge capacity that ripple Crane is produced is 75ml/r, axial inclined disc type high pressure P 90 pumps that rated speed of rotation is 3600rpm; The fixed displacement motor of choosing is that the rated pressure that ripple Crane is produced is 40MPa, the radial plunger fixed displacement motor MFE08-0 that discharge capacity is 1043ml/r.
The preferred three position four-way electromagnetic valve of the first electromagnetic valve 9, its Median Function is to be P, T sealing, A communicates with B, not off-load of pump, maneuverability pattern is that electromagnet is handled, spring reset, can select existing product according to system requirements.According to input signal instruction, its spool in diverse location to realize commutation function; In the time that spool is positioned at meta, P, T sealing, A communicates with B; In the time that spool is positioned at right position, P communicates with A, and T communicates with B; In the time that spool is positioned at left position, P communicates with B, and T communicates with A.
The preferred two-position three way magnetic valve of the second electromagnetic valve 10, maneuverability pattern is that electromagnet is handled, spring reset; According to the signal instruction of input, its spool can sway to realize commutation function; Spool is P and B connection in the time of right position; Spool is P and A connection in the time of left position.
The function of energy storage 12 is mainly the pressure energy of storage fluid, also can drive hydraulic circuit by hold-off pressure if desired.The characteristic parameter calculating according to the demand of target vehicle is chosen existing product.
Proportional pressure control valve 11 is high-voltage ratio by pass valves that a range of regulation is 0-40MPa, selects existing product, and the adjusting of its pressure is by electrohydraulic control; It is the water-cooled cooler of 40-60 ℃ that H Exch 15 adopts operating temperature, selects existing product; Safety valve group 13 is made up of two identical safety valves of structure model, and safety valve is selected the existing product of pressure limiting 40MPa, and when the installation of two safety valves, fluid flows to contrary.
Electronic control unit 17 is according to the controller of designed system control algorithm, and the status signal control system of travelling by collection vehicle is worked under different patterns.
Hydraulic pressure assistive drive described in the utility model and brake system are on the mechanical power transferring structure basis that does not change existing conventional target vehicle, to add power takeoff 7, Hydraulic Elements and electronic control unit 17 to form.
Particularly, hydraulic pressure assistive drive described in the utility model and brake system do not change installation site relation and the power transmission relationship between the original driving engine 1 of target vehicle, power-transfer clutch 2, change-speed box 3, drive axle 4, trailing wheel 5 and front-wheel 6 structures, the power output crank shaft end that is driving engine 1 adopts spline pair to be connected with power-transfer clutch 2 input shafts, the output shaft of power-transfer clutch 2 adopts spline pair to be connected with the input shaft of change-speed box 3, and the output shaft of change speed gear box 3 adopts spline pair to be connected with the input shaft of drive axle 4; Input shaft, the output shaft of described each parts are arranged on housing and in same level by antifriction-bearing box, and input shaft gear is sleeved on input shaft and becomes to be fixedly connected with on output shaft with output shaft gear, and input shaft gear and output shaft gear are connected with a joggle; Two described parts connect the input shaft adopting, the revolution contour of output shaft is parallel to each other.Driving engine 1, as propulsion source outputting power, after the transmission of power-transfer clutch 2, change-speed box 3 and drive axle 4, drives trailing wheel 5.
Hydraulic pressure assistive drive described in the utility model and brake system are added in structure, and the driving gear shaft (input shaft) of power takeoff 7 drives the power take-off shaft end 1b of annex to be connected with a joggle by gear with driving engine 1; Power takeoff 7 is by the intermeshing transmission of driving gear shaft gear and driven gear shaft (output shaft) gear, by the transmission of power of driving engine 1 to output shaft, the output shaft of power takeoff 7 adopts spline pair or flange or short universal-joint to be connected with being fixedly mounted between the rotor shaft of the high pressure controllable capacity pump 8 on vehicle frame, thereby make the outputting power of driving engine 1 drive the rotor shaft of high pressure controllable capacity pump 8 synchronously to rotate by power takeoff 7, pump oil flows to hydraulic circuit.
The oil outlet of high pressure controllable capacity pump 8 is connected by high pressure fuel pipe with the P mouth of three position four-way electromagnetic valve 9, and the T mouth of three position four-way electromagnetic valve 9 adopts low pressure pipe to be connected with oil tank 16 or directly sealing; A mouth adopts high pressure fuel pipe to be connected with the oil inlet of safety valve group 13; B mouth adopts high pressure fuel pipe to be connected with the P mouth of two-position three way magnetic valve 10; The A mouth of two-position three way magnetic valve 10 adopts high pressure fuel pipe to be connected with energy storage 12, and B mouth adopts high pressure fuel pipe to be connected with the oil inlet of proportional pressure control valve 11; The oil outlet of proportional pressure control valve 11 adopts low pressure pipe to be connected with the oil inlet of H Exch 15; The oil outlet of H Exch 15 flows to oil tank 16 through low pressure pipe; Proportional pressure control valve 11, H Exch 15 arrange with oil tank 16 three's serials;
The oil inlet of the fixed displacement motor 14 that the oil outlet of safety valve group 13 is identical with being arranged on 2 structures on two front-wheel 6 wheel hubs connects by high pressure fuel pipe, the oil outlet of the fixed displacement motor 14 that 2 structures are identical is connected by high pressure fuel pipe with the oil inlet that is fixed on the high pressure controllable capacity pump 8 on vehicle frame, form hydraulic closed-circuit, and the output rotor axle of the identical hydraulic pressure fixed displacement motor 14 of 2 structures is directly connected with the wheel hub mechanical bolt of two front-wheels 6 respectively, the hydraulic energy that high pressure controllable capacity pump 9 is pumped rotates by the output rotor axle that drives fixed displacement motor 14, be converted into mechanical energy, drive front-wheel 6.
The connecting interface place of above-mentioned each Hydraulic Elements and high pressure fuel pipe all should be used seal ring to seal, and reduces the leakage of fluid.
Electronic control unit 17 is connected with driving engine 1, high pressure controllable capacity pump 8, three position four-way electromagnetic valve 9, two-position three way magnetic valve 10, proportional pressure control valve 11 and energy storage 12 respectively by signal wire (SW), sends instruction to regulate the accelerator open degree of driving engine 1, the spool position of swash plate positions, three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10 and the operation pressure of proportional pressure control valve 11 and energy storage 12 of high pressure controllable capacity pump 8.Particularly, electronic control unit 17 can be connected different hydraulic drive circuits by the spool position that regulates three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10; Change-speed box 3 is by the transmission of power of driving engine 1 to trailing wheel 5 time, power takeoff 7 can be by the transmission of power of driving engine 1 to high pressure controllable capacity pump 8, high pressure controllable capacity pump 8 can be by itself and 2 hydraulic drive circuits that hydraulic pressure fixed displacement motor 14 forms that are arranged on front-wheel hub, the transmission of power of driving engine 1, to front-wheel 6, is realized to the full wheel drive form of vehicle; The hydraulic drive circuit that high pressure controllable capacity pump 8 also can consist of itself and energy storage 12, the kinetic energy during by the power of driving engine 1 or car brakeing is stored in 12 li of energy storages; The hydraulic drive circuit that high pressure controllable capacity pump 8 can also consist of itself and the slow brake system being made up of proportional pressure control valve 11, H Exch 15 and oil tank 16, the brake efficiency while improving car brakeing; Simultaneously in the situation that driving engine 1 cuts out, energy storage can 12 to form hydraulic drive circuit with 2 hydraulic pressure fixed displacement motors 14 that are arranged on front-wheel hub, transmission of power, to front-wheel 6, is driven separately to vehicle.
Next,, with reference to figure 1, according to the diverse location relation of three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10 spools, hydraulic pressure assistive drive described in the utility model and brake system comprise following four hydraulic drive circuits, are described in detail as follows:
The first hydraulic pressure assistive drive loop A
Three position four-way electromagnetic valve 9 spools are in left position, and two-position three way magnetic valve 10 spools are in left position; High pressure controllable capacity pump 8 pumps high pressure oil and works through the P-A passage of three position four-way electromagnetic valve 9 and 2 hydraulic pressure fixed displacement motors 14 that the 13 pressure limiting rear drives of safety valve group are arranged on front-wheel 6 wheel hubs, and hydrostatic drive path is 8 – 9 – 13 – 14.
Hydraulic braking energy recovery circuit B
Three position four-way electromagnetic valve 9 spools are in right position, and two-position three way magnetic valve 10 spools are in left position; High pressure controllable capacity pump 8 pump high pressure oil through the P-A passage of the P-B passage of three position four-way electromagnetic valve 9, two-position three way magnetic valve 10 to energy storage 12 pressurisings, hydraulic energy is stored, hydrostatic drive path is 8 – 9 – 10 – 12.
The slow loop C of hydraulic braking
Three position four-way electromagnetic valve 9 spools are in right position, and two-position three way magnetic valve 10 spools are in right position; High pressure controllable capacity pump 8 pumps high pressure oil and becomes through P-B passage, the P-B passage of two-position three way magnetic valve 10 and the pressure regulation effect of proportional pressure control valve 11 of three position four-way electromagnetic valve 9 fluid of high pressure high eating value, flow to oil tank 16 through the cooling effect of over-heat-exchanger 15, hydrostatic drive path is 8 – 9 – 10 – 11 – 15 – 16.
The second hydraulic pressure assistive drive loop D
Three position four-way electromagnetic valve 9 spools are in meta, and two-position three way magnetic valve 10 spools are in left position; High pressure controllable capacity pump 8 is not worked, energy storage 12 discharges hydraulic energy, high pressure oil is worked through the P-A passage of two-position three way magnetic valve 10, A-B passage and 2 hydraulic pressure fixed displacement motors 14 of safety valve group 13 pressure limiting drive installations on front-wheel 6 wheel hubs of three position four-way electromagnetic valve 9, and hydrostatic drive path is 12 – 10 – 9 – 13 – 14 – 6.
Introduce the condition that above-mentioned four hydraulic circuits open and close below.
When vehicle in motion, the tach signal of electronic control unit 17 Real-time Collection acceleration pedal position signals, brake pedal position signal, each wheel speed signal and driving engine 1, estimates and judges the motoring condition of vehicle and the operation of chaufeur intention.In the time that vehicle travels in good flat road surface, trailing wheel 5(drive wheel) do not occur skidding, illustrate that drive wheel can all utilize the output torque of driving engine 1 to drive vehicle.Now hydraulic booster system is not opened, and drives separately vehicle by driving engine 1; Power-transfer clutch 2 engages, and electronic control unit 17 sends instruction to high pressure controllable capacity pump 8, and to regulate its discharge capacity be 0, and high pressure controllable capacity pump 8 dallies, and delivery rate is 0; Regulate the spool position of three position four-way electromagnetic valve 9 in meta simultaneously, guarantee that each hydraulic circuit does not all participate in work.The power that driving engine 1 is exported all passes to trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4, drives Vehicle Driving Cycle.
In the time that vehicle cruises or at the uniform velocity travels with lower speed, driving engine 1 is operated in the poor region of fuel oil of slow speed of revolution low torque.The operation pressure signal of electronic control unit 17 Real-time Collection energy storages 12 is also estimated the SOC value of energy storage 12.If the SOC value of energy storage 12 is lower than preset value, for improving the fuel economy of driving engine 1, now can utilize the energy storage effect of energy storage 12, regulate the operation point of driving engine 1, make it be operated in the region that fuel economy is good, and the power of unnecessary trailing wheel 5 demand powers is to energy storage 12 pressurisings, storage liquid pressure energy is with recycling.Now electronic control unit 17 regulates the spool position of three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10 to connect hydraulic circuit B; Regulate accelerator open degree, the operation pressure of energy storage 12 and the discharge capacity of adjusting high pressure controllable capacity pump 8 of driving engine 1 according to the pressure signal of acceleration pedal position signal and energy storage 12 simultaneously.Now driving engine 1, by required trailing wheel power, through power-transfer clutch 2, change-speed box 3 and drive axle 4, passes to trailing wheel 5, drives Vehicle Driving Cycle; And the unnecessary power of driving engine 1 drives high pressure controllable capacity pump 8 working barrel oil through power takeoff 7, the transmission of high pressure oil process hydraulic circuit B, to energy storage 12 pressurisings, is that hydraulic energy stores to recycle by unnecessary power-conversion.
When vehicle is when in good flat road surface, low speed cruises or keeps the lower speed of a motor vehicle at the uniform velocity to travel, if electronic control unit 17 estimates the SOC value of energy storage 12 higher than its setting value, now can kill engine 1, and pass through hydraulic circuit D by the hydraulic energy storing in energy storage 12, drive separately front-wheel 6, meet the demand of travelling of vehicle.Now electronic control unit 17 regulates the spool position of three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10 to connect hydraulic circuit D, estimates demand power according to acceleration pedal position signal simultaneously, and regulates the operation pressure of energy storage 12.Energy storage 12 provides hydraulic energy as unique propulsion source, 2 the hydraulic pressure fixed displacement motors 14 of the transmission drive installation of high pressure oil process hydraulic circuit D on front-wheel 6 wheel hubs are worked, be that mechanical energy passes to front-wheel 6 by hydraulic energy transfer, drive Vehicle Driving Cycle, now vehicle is front axle drive form.
In the time that vehicle travels on bad road surface, electron steering is calculated unit and 17 is judged trailing wheel 5(drive wheel) while occurring skidding, illustrate that the output torque of driving engine 1 exceedes the maximum adhesion condition of road surface and tire.If the SOC value of energy storage 12 is lower than setting value, energy storage 12 can not provide hydraulic energy.Now power-transfer clutch 2 engages, and electronic control unit 17 sends instruction according to the motoring condition information of driver intention and vehicle to three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10, regulates their spool position, connects hydraulic circuit A.The now load of driving engine 1 has two parts, and a part is that trailing wheel 5 feeds back through mechanical drive, and another part is that front-wheel 6 is through hydrostatic drives feedback.Electronic control unit 17 regulates the displacement size of high pressure controllable capacity pump 8, makes driving engine 1 by available trailing wheel demand motive force, passes to trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4; Unnecessary power drives the rotor shaft of high pressure controllable capacity pump 8 to rotate pump oil through power takeoff 7, mechanical energy is converted into hydraulic energy, 2 the hydraulic pressure fixed displacement motors 14 of the transmission drive installation of high pressure oil process hydraulic circuit A on front-wheel 6 wheel hubs are worked, be mechanical energy by hydraulic energy transfer, pass to and drive front-wheel 6.Driving engine 1 is as unique propulsion source, and power drives axle through different drive path simultaneously, realizes the full wheel drive form of vehicle to improve dynamic property and the crossing ability of vehicle.If the SOC value of energy storage 12 is during higher than setting value, energy storage 12 can discharge the hydraulic energy of storage, and power is provided.Now electronic control unit 17, according to vehicle running state information, regulates the accelerator open degree of driving engine 1, makes driving engine 1 export the available power of trailing wheel, and passes to trailing wheel 5, reduces skidding of trailing wheel; And not enough power is provided by energy storage 12, thereby reduce fuel oil consumption.Now power-transfer clutch 2 engages, and electronic control unit 17 regulates the spool position of three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10, connects hydraulic circuit D; Regulate the discharge capacity of high pressure controllable capacity pump 8 is zero simultaneously, makes its idle running.The power that driving engine 1 is exported all passes to trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4; Energy storage 12 discharges hydraulic energy, and high pressure oil is through the transmission of hydraulic circuit D, and 2 the hydraulic pressure fixed displacement motors 14 of drive installation on front-wheel 6 wheel hubs are worked, by transmission of power to front-wheel 6.Driving engine 1 and energy storage 12 drive vehicle as propulsion source jointly, realize the full wheel drive form of vehicle to improve dynamic property and the crossing ability of vehicle.
Work as car brakeing, when especially lower long slope is braked for a long time, electronic control unit 17, according to the signal of Real-time Collection, judges the motoring condition of vehicle.Now driving engine 1 should not served as propulsion source outputting power, but as the work of transmission shaft deceleration loading, car load kinetic energy when propulsion source is driving vehicle braking.Driving engine 1 drives high pressure controllable capacity pump 8 through power takeoff 7, the driving torque of high pressure controllable capacity pump 8 equals the opposing torque of its driven wheel, and along with the pressure of the output fluid of high pressure controllable capacity pump 8 increases and increases, this opposing torque is by power takeoff 7 counteractions and driving engine 1.The deceleration loading of driving engine 1 adds the opposing torque load of high pressure controllable capacity pump 8, acts on trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4, and vehicle is produced to brake action.
If the SOC value of the energy storage 12 that electronic control unit 17 is estimated is during lower than setting value, by regulating the operation pressure of energy storage 12, driving torque that can regulated variable pump 8, thereby regulate the deceleration loading of trailing wheel, the car load kinetic energy that is to say car brakeing process can change into hydraulic energy and to energy storage 12 pressurisings, energy storage 12 stores hydraulic energy so that in low vehicle speeds, while killing engine, the demand motive force of vehicle is provided, reduces fuel oil consumption.Now power-transfer clutch 2 engages, and electronic control unit 17 sends instruction according to driver intention and vehicle running state to three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10, regulates their spool position, connects hydraulic circuit B.Now driving engine 1 is as the loaded work piece of car load braking; Electronic control unit 17 regulates the operation pressure of energy storage 12, thereby changes the delivery pressure of controllable capacity pump 8, changes its driving torque size.This driving torque counteraction and driving engine 1, and with together with the deceleration loading of driving engine 1, act on trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4, vehicle is produced to brake assisting effect, and then regulated the lock torque of vehicle.Electronic control unit 17 regulates the operation pressure of energy storage 12 according to demand, control lock torque and regenerating braking energy when car brakeing number, guaranteeing recuperated energy under the stable prerequisite of vehicle braking force, in energy-conservation, realizing and brake slowly and keep the stable effect of long-time brake efficiency.
If the SOC value of energy storage 12 is during higher than setting value, energy storage 12 can not continue pressurising stored energy.And in the time that vehicle still continues downhill braking and travels, in order to continue to keep brake efficiency stable of vehicle, need to connect hydraulic retarding brake circuit C.Now electronic control unit 17 regulates the spool position of three position four-way electromagnetic valve 9 and two-position three way magnetic valve 10, connects hydraulic circuit C, keeps high pressure controllable capacity pump 8 in max.cap. simultaneously.Working process in this situation is similar with above-mentioned energy storage 12 braking energy removal process, and difference is that the oil outlet pressure of high pressure controllable capacity pump 8 is subject to the linear regulation of proportional pressure control valve 11.High pressure controllable capacity pump 8 oil outlets are connected proportional pressure control valves 11 through hydraulic circuit C, absorb vehicle energy and hydraulic oil that temperature raises is back to oil tank 16 after cooling by H Exch 15.Electronic control unit 17 calculates the pressure size of braking requirement torque adjustment proportional pressure control valve 11 according to brake pedal position signal, thereby the lock torque while regulating car brakeing, realize vehicle in the time can not braking energy reclaiming, still can keep braking slowly and keeping the stable effect of long-time brake efficiency.
The mode of operation of hydraulic pressure assistive drive described in the utility model and brake system comprises 7 kinds, as shown in table 1:
The mode of operation of table 1 hydraulic pressure assistive drive and brake system
Zero represents disengaging of clutch, the idle running of high pressure controllable capacity pump, energy storage exoergic
● represent that power-transfer clutch joint, the loading of high pressure controllable capacity pump, valve core of the electromagnetic valve position, energy storage fill energy, proportional pressure control valve work
--represent that this mode of operation does not comprise this structural constituent
Below the mode of operation of hydraulic pressure assistive drive of the present utility model and brake system is introduced.
(1) the independent drive pattern of driving engine
The tach signal of electronic control unit 17 Real-time Collection acceleration pedal position signals, brake pedal position signal, energy storage operation pressure signal, each wheel speed signal and driving engine, and estimate and judge the motoring condition of vehicle and the operation of chaufeur intention.With reference to figure 2, in figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.When vehicle is travelling in good flat road surface, electronic control unit 17 is judged trailing wheel 5(drive wheel) do not skid, and the SOC value of energy storage 12 is greater than the ceiling value of setting, and now drive wheel can utilize the power of driving engine 1 completely.Under this pattern, power-transfer clutch 2 engages, and whole power of Vehicle Driving Cycle are provided by driving engine 1; Electronic control unit 17 regulates the spool of three position four-way electromagnetic valve 9 in meta, make P and T sealing, thereby the oil outlet of high pressure controllable capacity pump 8 sealing, energy storage 12 and the hydraulic circuit that is arranged on the hydraulic pressure fixed displacement motor 14 that 2 structures on front-wheel 6 wheel hubs are identical do not have power input, all do not work; Regulating the discharge capacity of high pressure controllable capacity pump 8 is 0, and load is zero, transmits the power coming drive idle running by driving engine 1 through power takeoff 7.Vehicle is all driven and is travelled by trailing wheel 5 under this pattern, and the power of driving engine 1 all passes to trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4, drives vehicle.Power transmission line as shown in Figure 2.
(2) driving engine is combined drive pattern with controllable capacity pump
With reference to figure 3, in figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.In the time that vehicle travels on bad road surface, electronic control unit 17 is judged trailing wheel 5(drive wheel) occur skidding, the SOC value of energy storage 12 is lower than the low limit value of setting simultaneously.Under this pattern, power-transfer clutch 2 engages, trailing wheel 5(drive wheel) power that only utilized part driving engine 1 to transmit, and energy storage 12 can not continue stored energy.Electronic control unit 17 regulates the spool position of three position four-way electromagnetic valve 9 in left position, connects hydraulic circuit A; Regulate the discharge capacity of high pressure controllable capacity pump 8 simultaneously, make it from driving engine 1 power taking working barrel oil, reduce the driving torque of trailing wheel 5.Under this pattern, vehicle becomes full wheel drive form, and driving engine 1, by the power of trailing wheel demand, passes to trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4; Drive high pressure controllable capacity pump 8 to rotate pump oil through power takeoff 7 unnecessary power, mechanical energy is converted into hydraulic energy, to hydraulic circuit, A fills high pressure oil, through safety valve group, 13 pressure limitings pass to 2 hydraulic pressure fixed displacement motors 14 that are arranged on wheel hub, it is that mechanical energy passes to front-wheel 5 that high pressure oil drives fixed displacement motor 14 to rotate hydraulic energy transfer, thereby realizes the full wheel drive of vehicle.Under this pattern, propulsion source only has driving engine 1, and power transfer path has two of mechanical drive and hydrostatic drives, as shown in Figure 3.
(3) driving engine is combined drive pattern with energy storage
With reference to figure 4, in figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.In the time that vehicle travels on bad road surface, electronic control unit 17 is judged trailing wheel 5(drive wheel) occur skidding, and the SOC value of energy storage 12 is higher than its predetermined ceiling value.Under this pattern, power-transfer clutch 2 engages, trailing wheel 5(drive wheel) power that only utilized part driving engine 1 to transmit; Electronic control unit 17 regulates the spool position of three position four-way electromagnetic valve 9 in meta, and the spool position of two-position three way magnetic valve 10, in left position, is connected hydraulic circuit D; Energy storage 12 discharges hydraulic energy, and 2 the hydraulic pressure fixed displacement motors 14 of the transmission pressure limiting drive installation of high pressure oil process hydraulic circuit D on front-wheel 6 wheel hubs are worked, and are that mechanical energy passes to front-wheel 6 by hydraulic energy transfer.Under this pattern, vehicle is full wheel drive form, electronic control unit 17 is estimated axle demand torque distribution, regulate the accelerator open degree of driving engine 1 and the operation pressure of energy storage 12, make driving engine 1 export the available power of trailing wheel 5, and pass to trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4; The hydraulic energy that regulates energy storage 12 to discharge, by the power of front-wheel 6 demands, drives hydraulic pressure fixed displacement motor 14 to work through the transmission pressure limiting of hydraulic circuit D, and transmission of power, to front-wheel 6, is realized to the full wheel drive of vehicle.Under this pattern, propulsion source has driving engine 1 and energy storage 12, and power transfer path has two of mechanical drive and hydrostatic drives, as shown in Figure 4.
(4) the independent drive pattern of energy storage
With reference to figure 5, in figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.When vehicle is when in good flat road surface, low speed cruises or keeps lower constant-velocity to travel, electronic control unit 17 is estimated and is judged vehicle travel situations now, and the SOC value of energy storage 12 is higher than its setting ceiling value.Now chaufeur can kill engine 1, and discharging by energy storage 12 that 2 fixed displacement motors 14 of hydraulic energy drive installation on front-wheel 6 wheel hubs work hydraulic energy transfer is that mechanical energy passes to front-wheel 6, drives Vehicle Driving Cycle, and now vehicle is front axle drive form.Under this pattern, driving engine 1 cuts out, and electronic control unit 17 regulates three position four-way electromagnetic valve spool to be positioned at meta, and the spool position of two-position three way magnetic valve 10 is in left position, thus connection hydraulic circuit D; The hydraulic energy that electronic control unit 15 regulates energy storage 12 to discharge, through the transmission of hydraulic circuit D, it is that mechanical energy passes to front-wheel 6 that 2 the hydraulic pressure fixed displacement motors 14 of high pressure oil drive installation on front-wheel 6 wheel hubs are worked hydraulic energy transfer, drives Vehicle Driving Cycle.This pattern propulsion source is energy storage 12, and power transfer path only has hydrostatic drive, as shown in Figure 5.
(5) driving engine drives separately and accumulator pressurizing pattern
With reference to figure 6, in figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.When vehicle is when in good flat road surface, low speed cruises or keeps lower constant-velocity to travel, electronic control unit 17 is estimated and is judged vehicle travel situations now, and the SOC value of energy storage 12 is lower than its predetermined low limit value, if now 1, driving engine drives Vehicle Driving Cycle, be operated in the poor region of the fuel oil of slow speed of revolution low torque.For improving the fuel economy of driving engine 1, utilize the energy storage feature of energy storage 12 to regulate the operation point of driving engine, the unnecessary power of driving engine 1 is stored to energy storage 12 pressurisings.Under this pattern, power-transfer clutch 2 engages, and electronic control unit 17 regulates high pressure controllable capacity pump 8, keeps its max.cap. work; Regulate the spool of three position four-way electromagnetic valve 9 in right position, the spool of two-position three way magnetic valve 10, in left position, is connected hydraulic circuit B.Under this pattern, vehicle is trailing wheel 5 drive forms, and a part of power of driving engine 1 passes to trailing wheel 5 through power-transfer clutch 2, change-speed box 3 and drive axle 4, drives Vehicle Driving Cycle; Another part power drives high pressure controllable capacity pump 8 to rotate pump oil through power takeoff 7, and mechanical energy is converted into hydraulic energy, and the transmission of process hydraulic circuit B, to energy storage 12 pressurisings, stores hydraulic energy.This pattern medium power source only has driving engine 1, and energy storage 12 is as loaded work piece, and power transfer path has mechanical drive and hydrostatic drive, as shown in Figure 6.
(6) energy storage braking energy take-back model
With reference to figure 7, in figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.Work as car brakeing, especially in the time of lower long slope when long-time service brake, electronic control unit 17 is estimated and is judged vehicle travel situations now, and the SOC value of energy storage 12 is lower than setting determined threshold.Electronic control unit 17 regulates the spool position of three position four-way electromagnetic valve 9 in right position, and two-position three way magnetic valve 10 spool positions, in left position, are connected hydraulic circuit B.Regulate high pressure controllable capacity pump 8 simultaneously, make it keep max.cap. work.Under this pattern, driving engine 1 and the hydraulic circuit being made up of controllable capacity pump 8 and energy storage 12 are jointly as the load of car brakeing, electronic control unit 17 passes through to regulate the operation pressure of energy storage 12 according to chaufeur braking intention, control the load of high pressure controllable capacity pump 8, thereby regulate stable lock torque when car brakeing, namely regulate energy storage 12 regenerating braking energies number.Keeping under the stable prerequisite of braking force, energy storage 12 is realized braking energy and is reclaimed to again utilize in low vehicle speeds situation, and outputting power, reaches energy-conservation object.Under this pattern, propulsion source is the kinetic energy of car brakeing process, and power transfer path has two of mechanical drive and hydrostatic drives, as shown in Figure 7.
(7) hydraulic retarding braking mode
With reference to figure 8, in figure, two-dot chain line represents electrical signal line, and dotted line represents conduit under fluid pressure, and heavy line represents mechanical connection.Work as car brakeing, especially in the time of lower long slope when long-time service brake, electronic control unit 17 is estimated and is judged vehicle travel situations now, and the SOC value of energy storage 12 is higher than setting ceiling value.Now energy storage 12 cannot reclaim braking energy, also just can not continue to keep the stable of vehicle braking force, if when vehicle is still in long slope service brake operating mode, electronic control unit 17 regulates high pressure controllable capacity pump 8, make it keep max.cap. work, regulate the spool position of three position four-way electromagnetic valve 9 in right position, two-position three way magnetic valve 10 spool positions, in right position, are connected hydraulic circuit C simultaneously.Under this pattern, driving engine 1 and the hydraulic circuit being made up of controllable capacity pump 8, proportional pressure control valve 11, H Exch 15, oil tank 16 are jointly as the load of car brakeing.The oil outlet pressure of high pressure controllable capacity pump 8 is subject to the linear regulation of proportional pressure control valve 11, electronic control unit 17 regulates the pressure size of proportional pressure control valve 11 according to chaufeur braking intention, thereby regulate the load of high pressure controllable capacity pump 8, and then regulate stable lock torque when car brakeing, keep braking force stable, realize and brake slowly and keep the stable effect of long-time brake efficiency.The kinetic energy that under this pattern, propulsion source is vehicle, power transfer path has two of mechanical drive and hydrostatic drives, and drive path is as shown in Figure 8.
The effect that can play with a certain case introduction system of the present utility model below.
When vehicle is at fully loaded 100t, it is 12.1 o'clock that change speed gear box one keeps off speed ratio, can calculate tractive force ratio and climbable gradient ratio that hydraulic auxiliary driving system described in the utility model can improve, as shown in Figure 9 and Figure 10.As seen from the figure, use after hydraulic pressure assistive drive, the max. climb slope of vehicle and tractive force obtain very significantly improving, and coefficient of road adhesion is lower, and improvement situation is more remarkable.In actual conditions, the target vehicles such as heavy duty truck, saddle tractor generally use this system in adhering on road surface of 0.3-0.4, and now the climbable gradient of vehicle and tractive force can improve 14.4%-17.2% and 13.4-15.6%.
Simultaneously when described hydraulic efficiency pressure system is during in auxiliary braking pattern, the speed ratio transmitting ratio that adopts power takeoff in system described in the utility model is 1:2, the maximum speed of revolution of Hydraulic Pump 9 is 3600rpm, max.cap. is 75ml/r, the pressure of the highest output hydraulic pressure oil is 40MPa, one gear speed ratio of vehicle is 12.1, base ratio is 5.73, as calculated, in the utility model, maximum braking torque can be additionally provided is 477.7Nm to Hydraulic Pump, amplify through transmission device, the lock torque that acts on trailing wheel can reach 66240.7Nm.Energy storage reclaims the size of braking energy and the estimation of actual operating mode and SOC value thereof has very large correlativity, so do not have this system of casehistory can reclaim how many energy here, but from the document of relevant hybrid vehicle energy-saving analysis, braking energy recycling accounts for very large ratio on car load is energy-conservation.
The control method of hydraulic pressure assistive drive described in the utility model and brake system comprises acquisition of signal and processing module, parameter estimation and setting module, mode decision module and mode control module, specifically describes as follows.
With reference to Figure 11, operation pressure, engine speed and each wheel speed signal of control unit Real-time Collection accelerator pedal position, brake pedal position, energy storage, estimate and judge the motoring condition of vehicle and the operation of chaufeur intention, regulate according to demand the spool position of first, second electromagnetic valve, and the accelerator open degree of control engine, variable capacity of pump, the operation pressure of energy storage and the operation pressure of apportioning valve, thereby control switching between each mode of operation and the each parts mode of operation at different mode.Specifically comprise the steps:
1. the operation pressure of control unit Real-time Collection accelerator pedal position, brake pedal position, energy storage, engine speed and each wheel speed signal, and by the processing such as filtering, modulation, and the position signal that will speed up pedal position and brake pedal is all converted into voltage signal A_V and the B_V that range is 0-5V;
Control unit according to each wheel speed signal adopt the real-time vehicle velocity V e of average wheel speed method estimating vehicle, according to the SOC value of the operation pressure estimation energy storage of energy storage; Set speed of a motor vehicle threshold value v1, v2, v3 and v1<v2<v3, wherein v1 is the speed of a motor vehicle threshold value of the independent drive pattern of energy storage, v2 is the speed of a motor vehicle threshold value that assistive drive pattern is opened, v3 is the speed of a motor vehicle threshold value that assistive drive pattern exits, and these values can be revised according to real train test data; Target setting slip rate s1 and s2(are such as s1=0.15, s2=0.20), and calculate target wheel speed threshold value vw1, vw2 according to wheel speed signal; Set ceiling value soc_h and the low limit value soc_l of the SOC of the work of energy storage, such as soc_h=0.8, soc_l=0.3; 3. judge whether vehicle velocity V e is greater than 0, if not, vehicle parking is described, control algorithm end of program; Otherwise enter next step;
4. judge whether brake pedal position voltage signal B_V is greater than 0.1V and whether accelerator pedal position voltage signal A_V is less than 0.1V, if it is think that vehicle is in braking mode, enter hydraulic pressure auxiliary braking control subalgorithm; Otherwise enter hydraulic pressure assistive drive control subalgorithm.
With reference to Figure 12, hydraulic pressure auxiliary braking control subalgorithm comprises the steps:
B1. electronic control unit regulates the spool position of the first electromagnetic valve, connects P-B passage, makes controllable capacity pump access auxiliary braking loop, and regulated variable pump simultaneously, makes it keep max.cap. work;
Whether the SOC value that B2. judges energy storage is greater than setting ceiling value soc_h, if yes then enter next step; Otherwise enter step B4;
B3. the SOC value of energy storage is greater than setting ceiling value soc_h, cannot reclaim braking energy, and now system enters hydraulic retarding braking mode, and electronic control unit regulates the spool position of the second electromagnetic valve, connects P-B passage, and hydraulic retarding brake circuit C is connected.Electronic control unit is according to the braking requirement of chaufeur simultaneously, the operation pressure of control ratio by pass valve, thereby the driving torque of control variable pump, and then regulate stable lock torque when car brakeing, keep braking force stable, realize and brake slowly and keep the stable effect of long-time brake efficiency.
Whether the SOC value that B4. judges energy storage is less than determinated low limit value soc_l, if yes then enter next step; Otherwise enter step B6;
B5. the SOC value of energy storage is less than determinated low limit value soc_l, illustrate energy storage can realize braking energy reclaim.Now system enters energy storage braking energy take-back model, and electronic control unit regulates the spool position of the second electromagnetic valve, connects P-A passage, and hydraulic braking energy recovery circuit B is connected; Simultaneously electronic control unit, according to the braking requirement of chaufeur, is controlled the operation pressure of energy storage, controls the load of high pressure controllable capacity pump, thus the stable lock torque while regulating car brakeing, namely regulate energy storage regenerating braking energy number;
B6. maintain system mode of operation previous stage;
B7. subalgorithm end of program, returns.
With reference to Figure 13, hydraulic pressure assistive drive control subalgorithm comprises the steps:
D1. judge whether vehicle velocity V e is less than setting value v1, if yes then enter next step, otherwise enter step D7;
D2. judge whether energy storage SOC value is greater than ceiling value soc_h, if yes then enter next step, otherwise enter step D4;
D3. now illustrate that the speed of a motor vehicle is lower, and energy storage can provide separately Vehicle Driving Cycle required drive, system enters the independent drive pattern of energy storage.Electronic control unit regulates the spool position of the first electromagnetic valve, connects A-B passage, regulates the spool position of the second electromagnetic valve, connects P-A passage, and the second hydraulic pressure assistive drive loop D is connected; Electronic control unit, according to the driving demand of chaufeur, regulates the operation pressure of energy storage simultaneously, discharges hydraulic energy and passes to front-wheel, drives Vehicle Driving Cycle; Enter step D21;
D4. judge whether energy storage SOC value is less than low limit value soc_l, if yes then enter next step; Otherwise enter step D6;
D5. now illustrate that the speed of a motor vehicle is lower, and energy storage continues storage liquid pressure energy.System enters driving engine and drives separately and accumulator pressurizing pattern.Electronic control unit regulates the spool position of the first electromagnetic valve, connects P-B passage, regulates the spool position of the second electromagnetic valve, connects P-A passage, and hydraulic braking energy recovery circuit B is connected; Regulated variable pump, makes its max.cap. work simultaneously.Electronic control unit is according to the driving demand of chaufeur and the operation pressure of energy storage, regulates the throttle of driving engine, adjusts its power output, and it is met outside the demand motive force that rear wheel drive vehicle travels, and provides hydraulic energy to energy storage; Enter step D21;
D6. maintain system state previous stage, enter step D21;
D7. judge whether vehicle velocity V e is less than setting value v2, if yes then enter next step; Otherwise enter step D17;
Whether the wheel speed Vw that D8. judges trailing wheel is greater than setting value vw2, if it is thinks that skidding appears in trailing wheel, enters next step; Otherwise enter step D14;
D9. now illustrate that skidding appears in trailing wheel, judge whether the SOC value of energy storage is greater than ceiling value soc_h, if yes then enter next step; Otherwise enter step D11;
D10. now illustrate that energy storage can provide hydraulic energy, assistive drive.System enters driving engine and combines drive pattern with energy storage.Electronic control unit regulates the spool position of the first electromagnetic valve, connects A-B passage, regulates the spool position of the second electromagnetic valve, connects P-A passage, and the second hydraulic pressure assistive drive loop D is connected; Electronic control unit is according to the driving demand of chaufeur simultaneously, and the distribution of torque of estimation axle, regulates the throttle of driving engine and the operation pressure of energy storage, makes them export the power of demand separately, jointly drives Vehicle Driving Cycle; Enter step D21;
Whether the SOC value that D11. judges energy storage is less than low limit value soc_l, if yes then enter step D13; Otherwise enter next step;
D12. maintain system mode of operation previous stage, enter step D21;
D13. now illustrate that energy storage cannot provide hydraulic energy, system enters driving engine and combines drive pattern with controllable capacity pump.Electronic control unit regulates the spool position of the first electromagnetic valve, connects P-A passage, and the first hydraulic pressure assistive drive loop A is connected.Electronic control unit, according to the driving demand of chaufeur, is estimated the distribution of torque of axle simultaneously, and regulated variable capacity of pump, to front and rear wheel, drives Vehicle Driving Cycle by the power reasonable distribution of driving engine jointly; Enter step D21;
Whether the wheel speed Vw that D14. judges trailing wheel is less than setting value vw1, if yes then enter next step; Otherwise enter step D16;
D15. now illustrate that trailing wheel exits slipping state, system enters the independent drive pattern of driving engine, enters step D20;
D16. maintain system mode of operation previous stage, enter step D21;
D17. judge whether vehicle velocity V e is greater than setting value v3, if yes then enter next step; Otherwise enter step D19;
D18., high vehicle speeds is now described, hydraulic auxiliary driving system exits, and system enters the independent drive pattern of driving engine, enters step D20;
D19. maintain system mode of operation previous stage, enter step 21;
D20. the independent drive pattern of driving engine, now electronic control unit regulates the spool position of the first electromagnetic valve, makes the sealing of P mouth, regulates the spool position of the second electromagnetic valve, connects P-B passage, makes hydraulic booster system all not participate in work; Regulated variable pump simultaneously, makes it keep zero delivery idle running work.The power of driving engine output all passes to trailing wheel, drives Vehicle Driving Cycle; Enter step 21;
D21. subalgorithm end of program, returns.
In summary, system of the present utility model can improve vehicle on bad road surface the crossing ability under driving cycle, realize braking energy and reclaim, improve the economy of vehicle, and improve car brakeing stability.

Claims (7)

1. a hydraulic pressure assistive drive and brake system, it is characterized in that, comprise: power takeoff, Hydraulic Pump, the first and second electromagnetic valves, proportional pressure control valve, energy storage, safety valve group, HM Hydraulic Motor, H Exch, oil tank and electronic control unit, driving engine, wherein
The input shaft of described power takeoff is connected with the output shaft of engine drive annex with the rotor shaft of described Hydraulic Pump respectively with output shaft, and described driving engine drives the rotation of described Hydraulic Pump by described power takeoff;
Described the first electromagnetic valve is connected with oil inlet and described second electromagnetic valve of the oil outlet of described Hydraulic Pump, described oil tank, described safety valve group respectively;
The oil inlet of described HM Hydraulic Motor is connected with the oil outlet of described safety valve group and the oil inlet of described Hydraulic Pump respectively with oil outlet;
Described the second electromagnetic valve is connected with the oil inlet of described the first electromagnetic valve, described energy storage and described proportional pressure control valve respectively;
The oil outlet of described proportional pressure control valve is connected with the oil inlet of described H Exch;
The oil outlet of described H Exch connects described oil tank;
Described control unit is connected with described Hydraulic Pump, the first electromagnetic valve, the second electromagnetic valve, proportional pressure control valve, energy storage.
2. hydraulic pressure assistive drive according to claim 1 and brake system, is characterized in that, between the input shaft of described power takeoff and the output shaft of described engine drive annex, adopts spline pair to be connected; Between the output shaft of described power takeoff and described cylinder block of hydraulic pumps axle, adopt spline pair to be connected, or adopt flange to connect or the connection of short universal-joint.
3. hydraulic pressure assistive drive according to claim 2 and brake system, is characterized in that, described the first electromagnetic valve is three-position four-way valve, and described the second electromagnetic valve is two position three-way valve;
The Median Function of wherein said three-position four-way valve is " U " type, P, T sealing, and A and B connect; P mouth, A mouth and the B mouth of described three-position four-way valve is connected with the oil inlet of the oil outlet of described Hydraulic Pump, described safety valve group and with the P mouth of described two position three-way valve respectively by pressure piping;
The T mouth of described three-position four-way valve is connected with described oil tank by low pressure pipeline;
A mouth, the B mouth of described two position three-way valve are connected with the oil inlet of energy storage, proportional pressure control valve respectively by pressure piping.
4. hydraulic pressure assistive drive according to claim 2 and brake system, is characterized in that, the oil inlet of described HM Hydraulic Motor is connected with the oil outlet of described safety valve group and the oil inlet of described Hydraulic Pump by pressure piping respectively with oil outlet;
The oil outlet of described proportional pressure control valve is connected with the oil inlet of described H Exch by low pressure pipeline;
The oil outlet of described H Exch is connected with described oil tank by low pressure pipeline.
5. hydraulic pressure assistive drive according to claim 3 and brake system, is characterized in that, the P-A passage of described Hydraulic Pump and described HM Hydraulic Motor, safety valve group, the first electromagnetic valve forms the first hydraulic pressure assistive drive loop;
The P-B passage of described Hydraulic Pump and described the first electromagnetic valve, the P-A passage of the second electromagnetic valve, energy storage form hydraulic braking energy recovery circuit;
Described proportional pressure control valve, H Exch and oil tank three are connected in series, form hydraulic cushion brake circuit with the P-A passage of described Hydraulic Pump, the first electromagnetic valve, the P-B passage of the second electromagnetic valve;
The A-B passage of described energy storage and described the first electromagnetic valve, the P-A passage of the second electromagnetic valve, safety valve group, HM Hydraulic Motor form the second hydraulic pressure assistive drive loop.
6. hydraulic pressure assistive drive according to claim 5 and brake system, is characterized in that, described proportional pressure control valve is adjusted pressure by controlling electric liquid, and its oil pressure relief scope is 0-40MPa;
Described three position four-way electromagnetic valve, two-position three way magnetic valve are handled and spring reset by electromagnet, and the operating temperature of described H Exch is 40-60 ℃.
7. hydraulic pressure assistive drive according to claim 5 and braking recovery system, is characterized in that, described Hydraulic Pump is axial plunger high pressure controllable capacity pump, and its work top pressure is 40Mpa;
Described HM Hydraulic Motor is 2 radial plunger high pressure fixed displacement motors that structure is identical, and the semiaxis of its rotor shaft and front-wheel is same axis, with bolts with the wheel hub of two front-wheels respectively.
CN201320735018.7U 2013-11-19 2013-11-19 Hydraulic auxiliary driving and braking system Withdrawn - After Issue CN203651750U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103569098A (en) * 2013-11-19 2014-02-12 中国第一汽车股份有限公司 Hydraulic auxiliary driving and braking system and control method thereof
CN105564395A (en) * 2016-02-29 2016-05-11 浙江吉利汽车研究院有限公司 Series connection type hydraulic automobile regenerative braking energy recycling system
CN105818668A (en) * 2016-04-21 2016-08-03 中国第汽车股份有限公司 Hydraulic auxiliary driving system with energy recovery and speed slowing functions and method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103569098A (en) * 2013-11-19 2014-02-12 中国第一汽车股份有限公司 Hydraulic auxiliary driving and braking system and control method thereof
CN103569098B (en) * 2013-11-19 2016-10-26 中国第一汽车股份有限公司 Hydraulic pressure process auxiliary drive and brakes and control method thereof
CN105564395A (en) * 2016-02-29 2016-05-11 浙江吉利汽车研究院有限公司 Series connection type hydraulic automobile regenerative braking energy recycling system
CN105818668A (en) * 2016-04-21 2016-08-03 中国第汽车股份有限公司 Hydraulic auxiliary driving system with energy recovery and speed slowing functions and method thereof
CN105818668B (en) * 2016-04-21 2018-07-10 中国第一汽车股份有限公司 With energy regenerating, the hydraulic auxiliary driving system of slow function and its method

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