CN104691538B - A kind of hybrid electric vehicle brake energy recovering system and method based on static pressure transmission - Google Patents

A kind of hybrid electric vehicle brake energy recovering system and method based on static pressure transmission Download PDF

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Publication number
CN104691538B
CN104691538B CN201510098084.1A CN201510098084A CN104691538B CN 104691538 B CN104691538 B CN 104691538B CN 201510098084 A CN201510098084 A CN 201510098084A CN 104691538 B CN104691538 B CN 104691538B
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China
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hydraulic pump
pump motor
motor mechanism
hybrid electric
electric vehicle
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CN104691538A (en
Inventor
杨立浩
朱从民
张波
宋昆
李璐
王卫青
赫思宇
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Architectural Engineering Institute of General Logistics Department of PLA
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Architectural Engineering Institute of General Logistics Department of PLA
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18Propelling the vehicle
    • B60W30/18009Propelling the vehicle related to particular drive situations
    • B60W30/18109Braking
    • B60W30/18127Regenerative braking
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B60W10/101Infinitely variable gearings
    • B60W10/103Infinitely variable gearings of fluid type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00Input parameters relating to a particular sub-units
    • B60W2510/08Electric propulsion units
    • B60W2510/081Speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00Input parameters relating to a particular sub-units
    • B60W2510/10Change speed gearings
    • B60W2510/104Output speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00Input parameters relating to a particular sub-units
    • B60W2510/24Energy storage means
    • B60W2510/242Energy storage means for electrical energy
    • B60W2510/244Charge state
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00Input parameters relating to occupants
    • B60W2540/12Brake pedal position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00Output or target parameters relating to a particular sub-units
    • B60W2710/08Electric propulsion units
    • B60W2710/086Power
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00Output or target parameters relating to a particular sub-units
    • B60W2710/10Change speed gearings
    • B60W2710/1077Change speed gearings fluid pressure, e.g. oil pressure
    • B60W2710/1088Change speed gearings fluid pressure, e.g. oil pressure pressure of working fluid

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The present invention relates to a kind of hybrid electric vehicle brake energy recovering system based on static pressure transmission and method, electronic brake pedal including power battery pack and hybrid electric vehicle, and motor, the first hydraulic pump motor mechanism, the second hydraulic pump motor mechanism and the wheel being sequentially connected.Judge whether hybrid electric vehicle is in on-position by electronic brake pedal aperture;When hybrid electric vehicle is in on-position, motor is set to be operated in generating state, charged for power battery pack, formed braking procedure in drag the Brake energy recovery structure that motor is generated electricity so that hydraulic system is counter, by hydraulic energy transfer be electrical power storage into power battery pack;And the discharge capacity of the first hydraulic pump motor mechanism and the second hydraulic pump motor mechanism is adjusted according to severity of braking value, it is ensured that motor is operated in efficiency power generation area, realizes that braking energy converts recovery to greatest extent.

Description

A kind of hybrid electric vehicle brake energy recovering system and method based on static pressure transmission
Technical field
The present invention relates to Brake energy recovery field, more particularly to a kind of hybrid electric vehicle Brake Energy based on static pressure transmission Measure recovery system and method.
Background technology
With the increasingly depleted and increasingly serious, the various automobile energy-savings of environmental problem of the fossil resources such as oil, natural gas Technology is more and more developed and applied.Brake energy recovery is a kind of effective automobile energy-saving technology, and it passes through The braking energy of recycling vehicle come reduce vehicle traveling when energy dissipation, improve energy conversion efficiency.Generally The energy regenerating strategy used is broadly divided into following three kinds:1) when possessing the vehicle braking of gearbox, CVT or fluid torque-converter, The kinetic energy travelled by transmission system with vehicle drives electrical power generators, and by the power storage of generation in super capacitor or electric power storage Chi Zhong;2) when vehicle is braked, the kinetic energy of vehicle is transformed into the kinetic energy storage of high speed flywheel;3) using static pressure transmission Vehicle, when vehicle is braked the kinetic energy of vehicle is transformed into pressure potential by pump motor mechanism is stored in accumulator.
Wherein, scheme 1 due to the gearratio adjustable extent of existing transmission system it is smaller, be difficult to make motor reach simultaneously during braking Higher generating rotating speed is maintained, and then causes vehicle energy can not to be converted into electric energy in time and is stored.In addition, this also leads Electricity generation system is caused to meet the braking torque demand of vehicle and must be aided in mechanical braking, this is virtually just wasted A large amount of braking energies, limit the lifting of the vehicle braking energy rate of recovery.The development pair of CVT technologies and fluid torque-converter technology This problem has some improvement, but also far from reaching gratifying effect.Static pressure transmission vehicle is generally entered using scheme 3 Row Brake energy recovery, the power density of accumulator is big, carry out energy that can be rapidly and efficiently in the starting stage of energy regenerating Reclaim, but its energy density is limited, the accumulator of a large amount of energy demands of storage is sufficiently bulky but also can influence hydraulic oil container Volume, this does not allow in the layout of vehicle.Therefore, a set of scheme ten for being capable of high efficiente callback vehicle braking energy is developed Divide necessity.
The content of the invention
It is an object of the invention to solve the problems of the prior art to return there is provided a kind of carry out energy that can be rapidly and efficiently The hybrid electric vehicle brake energy recovering system based on static pressure transmission and method received.
The technical scheme of brake energy recovering system of the present invention is:
Including the motor being sequentially connected on hybrid electric vehicle, the first hydraulic pump motor mechanism, the second hydraulic pump motor mechanism And wheel, the first hydraulic pump motor mechanism and the second hydraulic pump motor mechanism are electrically connected with entire car controller respectively;Vehicle Controller is also electrically connected with power battery pack, electric machine controller and electronic brake pedal respectively;Wherein:
Motor is used to provide power under electric drive mode for the traveling of vehicle;Auxiliary mixing is dynamic under combination drive pattern The engine work of power car, power-assisted is provided for vehicle;In driving charging with Brake energy recovery pattern, being operated in generating State, is power battery pack supplement electricity;
First hydraulic pump motor mechanism and the second hydraulic pump motor mechanism are used for the static pressure transmission for realizing hybrid electric vehicle, real The high efficiente callback of existing braking energy;
Electronic brake pedal is used to provide brake pedal opening amount signal and aperture rate of change signal for entire car controller;
Entire car controller is used for the opening amount signal and aperture rate of change signal for obtaining electronic brake pedal in real time, and judges mixed Close whether power car is in on-position;When hybrid electric vehicle is in on-position, entire car controller passes through electric machine controller Controlled motor is operated in generating state;Entire car controller is additionally operable to obtain motor and the rotating speed letter of the second hydraulic pump motor mechanism Number, and tach signal is converted into GES, pass through with reference to opening amount signal and the aperture rate of change signal of electronic brake pedal Fuzzy reasoning obtains current severity of braking signal, then adjusts the first hydraulic pump motor mechanism and the second hydraulic pump motor machine respectively The working condition of structure, makes its drive motor generate electricity and store in power battery pack, realizes the recovery of braking energy;
The control signal that electric machine controller is used to send entire car controller is sent to motor, and electricity is controlled according to control signal Output speed, torque and the mode of operation for adjusting motor of machine.
The power battery pack is electrically connected by power battery pack SOC value sensor with entire car controller, power battery pack SOC value sensor is used for the SOC value for detecting power battery pack.
Motor speed sensor is provided with the motor, motor speed sensor is used for the motor speed signal of acquisition Electric machine controller is passed to, CAN communication mode is used between the electric machine controller and entire car controller.
The first hydraulic pump motor mechanism include two pressure ports of A, B, and be separately provided for obtain A pressure ports and The pressure signal of B pressure ports, and it is converted into A mouthfuls of pressure sensors of hydraulic pump and hydraulic pressure that current signal is transported to entire car controller B mouthfuls of pressure sensors of pump.
The second hydraulic pump motor mechanism is provided with for gathering its tach signal and transmitting to the liquid of entire car controller Pressure motor speed probe.
The first hydraulic pump motor mechanism is becomes discharge capacity type, and the second hydraulic pump motor mechanism is change discharge capacity type or fixed displacement Type.
The technical scheme of method for recovering brake energy of the present invention is:
Electronic brake pedal including power battery pack and hybrid electric vehicle, and motor, the first hydraulic pressure being sequentially connected Pump motor mechanism, the second hydraulic pump motor mechanism and wheel, Brake energy recovery comprise the following steps:
1) judge whether hybrid electric vehicle is in on-position;
2) when hybrid electric vehicle is in on-position, motor is operated in generating state, be that power battery pack is filled Electricity, and motor and the tach signal of the second hydraulic pump motor mechanism are obtained simultaneously;
3) tach signal of the second hydraulic pump motor mechanism is converted into GES, and combines opening for electronic brake pedal Degree signal obtains current severity of braking value with aperture rate of change signal by fuzzy reasoning;
4) severity of braking region is divided according to severity of braking value, and to the first hydraulic pump motor mechanism and the second hydraulic pump horse Discharge capacity up to mechanism is adjusted, and realizes the hybrid electric vehicle Brake energy recovery based on static pressure transmission.
The step 1) in be by the aperture size of the electronic brake pedal of hybrid electric vehicle judge whether in braking State, when wherein aperture is 0, hybrid electric vehicle is in normal startup transport condition;During aperture > 0, hybrid electric vehicle is in On-position.
The step 3) in severity of braking value for (0,5], and (0,1] be light and slow severity of braking region, (1,3.5] be Etc. severity of braking region, (3.5,5] it is brake hard intensity area.
The step 4) in discharge capacity regulation specifically include:
When hybrid electric vehicle is in light and slow severity of braking region, the discharge capacity of the second hydraulic pump motor mechanism is adjusted to first The 2/3 of its adjustable extent maximum, then presses the displacement value of the first hydraulic pump motor mechanism as following formula (I) is adjusted:
When severity of braking is in average braking intensity area, the discharge capacity of the second hydraulic pump motor mechanism is adjusted to its adjustable The 2/3 of scope maximum, then presses the displacement value of the first hydraulic pump motor mechanism as following formula (II) is adjusted:
When in brake hard intensity area, the second hydraulic pump motor mechanism discharge capacity is adjusted to maximum, and by the first liquid (III) is adjusted the discharge capacity of press pump motor mechanism as the following formula, and electric machine controller adjusts the generated output of motor to maximum;
In above-mentioned formula (I), formula (II) and formula (III), P'bThe discharge capacity of first hydraulic pump motor mechanism during for light and slow braking Value, pbThe displacement value of first hydraulic pump motor mechanism, P during for average brakingbjFirst hydraulic pump motor mechanism during for brake hard Displacement value;PlbgrThe 2/3 of second hydraulic pump motor mechanism discharge capacity adjustable extent maximum;vlbFor the second hydraulic pump motor mechanism The tachometer value detected in real time;ηlbgFor the volumetric efficiency of the second hydraulic pump motor mechanism;vbefFor motor highest generating efficiency area Corresponding range of speeds median;ηbFor the volumetric efficiency of the first hydraulic pump motor mechanism;BzdFor severity of braking value;FvFor root According to different hybrid electric vehicles formulate the first hydraulic pump motor mechanism discharge capacity correction factor, span for (1,2];PbminFor First hydraulic pump motor mechanism can keep the minimum injection rate value run well.
Compared with prior art, the present invention has following beneficial technique effect:
The present invention obtains the opening amount signal of hybrid electric vehicle electronic brake pedal by using entire car controller and aperture becomes Rate signal judges on-position, by obtaining the tach signal of motor and the second hydraulic pump motor mechanism, and is converted into car Fast signal, severity of braking signal is finally given with reference to opening amount signal and the aperture rate of change signal of electronic brake pedal, further according to Severity of braking value adjusts the discharge capacity of the first hydraulic pump motor mechanism and the second hydraulic pump motor mechanism, is formed in braking procedure with liquid Pressure system is counter drag the Brake energy recovery structure that motor is generated electricity, energy during automobile brake, including automobile kinetic energy and under Gravitional force during slope, directly by the way that the second hydraulic pump motor organisation conversion is hydraulic energy and then driving and motor connection first Hydraulic pump motor mechanism is operated, and hydraulic energy transfer is electricity by the first hydraulic pump motor mechanism drive motor operating with motor connection It can be stored into power battery pack, the rotating speed of monitoring motor and the discharge capacity by adjusting Liang Ge hydraulic pump motors mechanism, are protected in real time Card motor is operated in efficiency power generation area, realizes that braking energy converts recovery to greatest extent.
Further, the present invention is by setting power battery pack SOC value sensor, the SOC value for detecting power battery pack, The working condition that should be currently in auxiliary judgment hybrid electric vehicle.When hybrid electric vehicle is in on-position and electrokinetic cell During group electricity saturation, no longer charged for battery pack, prevent over-charging of battery, extend power battery pack service life.
Further, the present invention is obtained in real time by setting B mouthfuls of pressure sensors of A mouthfuls of pressure sensors of hydraulic pump and hydraulic pump Take the A pressure ports of the first hydraulic pump motor mechanism and the pressure value of B pressure ports, draw the current operating power of hybrid electric vehicle and Efficiency, beneficial to more quickly and efficiently reclaiming braking energy.
Further, the first hydraulic pump motor mechanism is becomes discharge capacity type in the present invention, and the second hydraulic pump motor mechanism arranges to become Amount type or constant displacement type, the displacement value of the first hydraulic pump motor mechanism can be adjusted in real time according to the difference of severity of braking, if the Two hydraulic pump motor mechanisms then coordinate regulation simultaneously equally from discharge capacity type is become, and Liang Tao hydraulic pump motors mechanism realizes mixed jointly Close the hydraulic stepless speed regulating function of power car;And Liang Tao hydraulic pump motors mechanism discharge capacity can be passed through when hybrid electric vehicle is braked Real-time adjustment ensure that motor is in its efficacious workaround all the time, so as to realize hybrid electric vehicle in the premise braked in time of guarantee Under reclaim braking energy to greatest extent.
The present invention is used for the method for recovering brake energy of static pressure transmission hybrid electric vehicle, is dragged when being braking so that hydraulic system is counter The method for recovering brake energy that motor is generated electricity, can allow auxiliary of the brake independent of mechanical braking, not by accumulator The low limitation of energy density, and motor can be made to be reached simultaneously close within the braking whole time according to the braking intention of driver Higher generating rotating speed is maintained, the braking energy of hybrid electric vehicle is converted into electric energy to greatest extent, braking energy is realized Reclaim to greatest extent, the inventive method can also avoided on the premise of without ABS system braking when tire by the danger of locking, Improve the braking safety of hybrid electric vehicle.
Further, the present invention, by the way that the severity of braking of hybrid electric vehicle is converted into concrete numerical value, is pump motor mechanism row Value adjusts governing equation and provides call parameter in real time.
Further, pump motor mechanism is proposed according to the analysis to hybrid power vehicle hydraulic system in recovery method of the present invention The governing equation of displacement value, has ensured the efficiency and effect of Brake energy recovery.
Brief description of the drawings
Fig. 1 show the assembly structure chart of the present invention.
Fig. 2 show the logic control schematic diagram of the present invention.
Wherein:1- motors;2- motor speed sensors;The first hydraulic pump motors of 3- mechanism;B mouthfuls of pressure sensings of 4- hydraulic pumps Device;A mouthfuls of pressure sensors of 5- hydraulic pumps;The second hydraulic pump motors of 6- mechanism;7- wheels;8- hydraulic motor speed sensors;9- Electronic brake pedal;10- entire car controllers;11- electric machine controllers;12- power battery packs.
Embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect are clearer, below in conjunction with accompanying drawing The present invention will be described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, It is not intended to limit the present invention.
Reference picture 1, the present invention in hybrid electric vehicle use oil electric mixed type power source, including respectively with entire car controller (ECU) motor 1 of 10 electrical connections, electric machine controller 11, hydraulic pump motor mechanism and related hydraulic valve piece, electronic brake pedal 9th, motor speed sensor 2, hydraulic motor speed sensor 8, A mouthfuls of pressure sensors 5 of hydraulic pump, B mouthfuls of pressure sensings of hydraulic pump Device 4, power battery pack 12 and power battery pack SOC value sensor etc., wherein hydraulic pump motor mechanism include adopting each other With the first hydraulic pump motor mechanism 3 and the second hydraulic pump motor mechanism 6 of hydraulic connecting, the machinery of the first hydraulic pump motor mechanism 3 Connect motor 1 and including two pressure ports of A, B, the second hydraulic pump motor mechanism 6 mechanically connects wheel 7.Wherein:
Motor 1 uses GM (generator/motor) motor, can not only make motor but also can make generator using, main It is used under electric drive mode provide power for the traveling of vehicle;Assisted engine works under combination drive pattern, is whole Car provides power-assisted;In driving charging with Brake energy recovery pattern, being operated in generating state, being that power battery pack 12 is mended Charge volume.
Motor speed sensor 2 and determines the corresponding of the rotor of current motor 1 mainly for detection of the real-time rotating speed of motor 1 Position, is then supplied to electric machine controller 11 and entire car controller 10 to judge and specifically control by coherent signal.
Hydraulic pump motor mechanism and related hydraulic valve piece are mainly used in realizing the static pressure transmission of hybrid electric vehicle, hydraulic pump The use of motor mechanism can realize braking energy high efficiente callback.
B mouthfuls of pressure sensors 4 of A mouthfuls of pressure sensors 5 of hydraulic pump and hydraulic pump are mainly for detection of the first hydraulic pump motor The A pressure ports of mechanism 3 and the pressure value of B pressure ports, and pressure value is converted into current signal be transported in entire car controller 10, To calculate the current operating power of hybrid electric vehicle and efficiency.
Hydraulic motor speed sensor 8 mainly for detection of the second hydraulic pump motor mechanism 6 real-time rotating speed, then by phase OFF signal is supplied to the computing of entire car controller 10 to obtain the present speed of hybrid electric vehicle to make reasoning.
Electronic brake pedal 9 is mainly used in providing the braking requirement signal of driver, including electronics for entire car controller 10 The aperture of brake pedal 9 and brake pedal aperture rate of change.
Entire car controller 10 is used to monitor the rotating speed of motor 1, the A pressure ports of the first hydraulic pump/motor mechanism 3 and B pressures in real time The relevant parameter such as pressure, the aperture of electronic brake pedal 9 and the aperture rate of change of power mouthful, power battery pack SOC value, and according to these Parameter carries out corresponding logic judgment and computing, so send instruction controlled motor 1, the working condition of hydraulic pump motor mechanism with Realization is reclaimed to greatest extent using improving hybrid electric vehicle fuel economy as the braking energy of target.
Electric machine controller 11 is mainly instructed to receive entire car controller 10, and is turned according to the output of instruction controlled motor 1 Speed, torque and the mode of operation for adjusting motor 1.
Power battery pack SOC value sensor and is transmitted to full-vehicle control mainly for detection of the SOC value of power battery pack 12 Device 10, the working condition that should be currently in auxiliary judgment hybrid electric vehicle is moved when hybrid electric vehicle is in on-position During 12 electricity saturation of power battery pack, no longer charged for battery pack, prevent over-charging of battery, extension power battery pack 12 uses the longevity Life.
Wherein, motor 1 uses GM motors, and rear end must connect the first hydraulic pump motor mechanism 3 for becoming discharge capacity type, and the Two hydraulic pump motor mechanisms 6 may be selected using change discharge capacity type or constant displacement type, and the second hydraulic pump motor mechanism 6 is located at wheel 7 Side, direct drive of wheel 7 is rotated;Electronic brake pedal 9 needs directly or indirectly provide pedal aperture and aperture change Rate two paths of signals;The SOC value of power battery pack 12 is supplied to full-vehicle control by battery management system (bms) (not indicated in figure) Device 10;Data interaction is carried out by CAN between entire car controller 10 and electric machine controller 11;Hydraulic system is other in figure Accessory structure, such as repairing, leakage passage, control valve block, pressure limit loop etc. because associated with core content of the present invention it is smaller Do not provided one by one in figure.
Reference picture 2, is illustrated method for recovering brake energy of the present invention as follows:
1st, after hybrid electric vehicle starts, entire car controller 10 detects the aperture of electronic brake pedal 9 in real time, when aperture is When " 0 ", hybrid electric vehicle normally starts traveling;When aperture is more than " 0 ", illustrate that hybrid electric vehicle is in on-position.
2nd, entire car controller 10, which directly sends instruction, makes motor 1 be operated in generating state, and electric machine controller 11 connects power The charging circuit of battery pack 12.
3rd, the pedal opening signal measured in real time and aperture rate of change signal are given entire car controller by electronic brake pedal 9 10, the tach signal of the second hydraulic pump motor mechanism 6 is given entire car controller 10 by motor rotational speed sensor 8 in a pulsed fashion, Motor speed sensor 2 in a pulsed fashion by the tach signal of the first hydraulic pump motor mechanism 3 give electric machine controller 11 and by Electric machine controller 11 gives entire car controller 10 by CAN.
4th, the tach signal of the second hydraulic pump motor mechanism 6 is converted into GES by entire car controller 10, includes one Using the opening amount signal of electronic brake pedal 9 and aperture rate of change signal and GES as input, using severity of braking as The fuzzy logic controller of output, the severity of braking of hybrid electric vehicle can be converted into (0,5] numerical value, be the first hydraulic pump The displacement value of the hydraulic pump motor mechanism 6 of motor mechanism 3 and second adjusts offer call parameter in real time;
Wherein by strength signal scope (0,1] be defined as light and slow brake area;Will (1,3.5] it is defined as average braking intensity Region;Will (3.5,5] it is defined as brake hard intensity area.
5th, the present invention proposes the control of hydraulic pump motor mechanism displacement value according to the analysis to hybrid power vehicle hydraulic system Equation processed, has ensured the efficiency and effect of Brake energy recovery.
5.1 when in (3.5,5] brake hard intensity area when, entire car controller 10 control the second hydraulic pump motor machine The discharge capacity of structure 6 is adjusted to maximum, and the discharge capacity of the first hydraulic pump motor mechanism 3 is adjusted by formula (1), and electric machine controller 11 will The generated output of motor is adjusted to maximum.Now, the first hydraulic pump motor mechanism 3 will run at high speed and drive motor 1 is with most Big generated output generates electricity, so as to provide larger braking moment for hybrid electric vehicle, unnecessary hybrid electric vehicle kinetic energy will pass through The modes such as hydraulic overflow, leakage are produced to be dissipated in the way of hydraulic pressure generates heat (therefore can aid in without mechanical braking).This scheme Under, hybrid electric vehicle with the premise of tire not locking (therefore hybrid electric vehicle can be independent of anti-lock braking system) as early as possible Brake as main control targe.
In formula, PbjThe displacement value of first hydraulic pump motor mechanism 3 during for brake hard;PbminFor the first hydraulic pump motor machine Structure 3 can keep the minimum injection rate value run well, prevent wheel lock up;BzdTo be obtained by the fuzzy reasoning of entire car controller 10 Severity of braking value.
5.2 when severity of braking be in it is medium (1,3.5] when, entire car controller 10 is first by the second hydraulic pump motor mechanism 6 Discharge capacity be adjusted to the 2/3 of its adjustable extent maximum.Then by the displacement value of the first hydraulic pump motor mechanism 3, (2) are entered as the following formula Row regulation:
In formula, pbFor the displacement value of the first hydraulic pump motor mechanism 3;PlbgrIt is adjustable for the discharge capacity of the second hydraulic pump motor mechanism 6 The 2/3 of scope maximum;vlbThe tachometer value detected in real time for the first hydraulic pump motor mechanism 3;ηlbgFor gained the of tabling look-up in real time The volumetric efficiency of two hydraulic pump motor mechanisms 6;vbefCorresponding to the motor highest generating efficiency area as obtained by looking into motor MAP Range of speeds median;BzdFor the severity of braking value obtained by the fuzzy reasoning of entire car controller 10;FvFor according to different blended The discharge capacity correction factor for the first hydraulic pump motor mechanism 3 that power car parameter is formulated is closed, according to hybrid electric vehicle to retro-speed With the different demands of intensity, discharge capacity correction factor FvSpan (1,2], specially demand is bigger, then value is higher.ηb For the volumetric efficiency for the first hydraulic pump motor mechanism 3 of gained of tabling look-up in real time.
This discharge capacity regulation equation can control hybrid electric vehicle on the premise of braking in time is ensured, allow motor as far as possible 1 is operated in high efficient district, and dependence motor 1 as much as possible generate electricity produced by braking moment braked.
5.3 when hybrid electric vehicle be in light and slow severity of braking (0,1] when, entire car controller 10 is equally first by the second hydraulic pressure The discharge capacity of pump motor mechanism 6 is adjusted to the 2/3 of its adjustable extent maximum.Then by the displacement value of the first hydraulic pump motor mechanism 3 It is adjusted by equation below (3):
In formula, P'bFor the displacement value of the first hydraulic pump motor mechanism 3;PlbgrCan for the discharge capacity of the second hydraulic pump motor mechanism 6 Adjust the 2/3 of scope maximum;vlbThe tachometer value detected in real time for the second hydraulic pump motor mechanism 6;ηlbgFor gained of tabling look-up in real time The volumetric efficiency of second hydraulic pump motor mechanism 6;vbefIt is right for the motor highest generating efficiency area as obtained by looking into motor MAP The range of speeds median answered;ηbFor the volumetric efficiency for the first hydraulic pump motor mechanism 3 of gained of tabling look-up in real time.
This equation can be worked in efficiency power generation region with controlled motor 1 in whole braking procedure, make hybrid power The kinetic energy of hybrid electric vehicle is converted into electrical power storage in power battery pack 12 by car with highest efficiency by motor 1.
More than regulation process be according to the first hydraulic pump motor mechanism 3 and the second hydraulic pump motor mechanism 6 be change discharge capacity What the situation of type was carried out, if the second hydraulic pump motor mechanism 6 uses constant displacement type, only adjust first by above formula respectively Hydraulic pump motor mechanism 3.
The present invention, which is formd, is different from common mechanical transmission and the energy-recuperation system of static pressure transmission hybrid electric vehicle, automobile Energy during braking, including gravitional force when automobile kinetic energy and descending, are directly converted by the second hydraulic pump motor mechanism 6 The first hydraulic pump motor mechanism 3 being connected for hydraulic energy and then driving with motor 1 is operated, the first hydraulic pump being connected with motor 1 Motor mechanism 3 drive motor 1 operate by hydraulic energy transfer be electrical power storage into power battery pack 12, so the present invention is innovated With the anti-brake energy recovering system for dragging motor 1 to be generated electricity of hydraulic system and method when proposing a kind of braking.The present invention can With the auxiliary independent of mechanical braking, do not limited by accumulator energy density is low, can also be according to the difference of severity of braking The displacement value of regulation hydraulic system, makes motor 1 be tried one's best with hydraulic pump motor mechanism and runs in efficient operation region in real time, real Existing braking energy converts recovery to greatest extent.The present invention can also avoided on the premise of without ABS system braking when tire quilt The danger of locking, improves the braking safety of hybrid electric vehicle.
It the foregoing is only presently preferred embodiments of the present invention and oneself, be not intended to limit the invention, all essences in the present invention God and any modifications, equivalent substitutions and improvements made within principle include reconciling discharge capacity improvement of equation etc., all should include Within protection scope of the present invention.

Claims (8)

1. a kind of hybrid electric vehicle method for recovering brake energy based on static pressure transmission, it is characterised in that:Including power battery pack (12) and hybrid electric vehicle electronic brake pedal (9), and be sequentially connected motor (1), the first hydraulic pump motor mechanism (3), the second hydraulic pump motor mechanism (6) and wheel (7), Brake energy recovery comprises the following steps:
1) judge whether hybrid electric vehicle is in on-position;
2) when hybrid electric vehicle is in on-position, motor (1) is operated in generating state, be that power battery pack (12) is carried out Charging, and motor (1) and the tach signal of the second hydraulic pump motor mechanism (6) are obtained simultaneously;
3) tach signal of the second hydraulic pump motor mechanism (6) is converted into GES, and combines electronic brake pedal (9) Opening amount signal obtains current severity of braking value with aperture rate of change signal by fuzzy reasoning;
4) severity of braking region is divided according to severity of braking value, and to the first hydraulic pump motor mechanism (3) and the second hydraulic pump horse Discharge capacity up to mechanism (6) is adjusted, and realizes the hybrid electric vehicle Brake energy recovery based on static pressure transmission;
The step 3) in severity of braking value for (0,5], and (0,1] be light and slow severity of braking region, (1,3.5] be medium system Fatigue resistance region, (3.5,5] it is brake hard intensity area;
The step 4) in discharge capacity regulation specifically include;
When hybrid electric vehicle is in light and slow severity of braking region, the discharge capacity of the second hydraulic pump motor mechanism (6) is adjusted to first The 2/3 of its adjustable extent maximum, then presses the displacement value of the first hydraulic pump motor mechanism (3) as following formula (I) is adjusted:
When severity of braking is in average braking intensity area, the discharge capacity of the second hydraulic pump motor mechanism (6) is adjusted to its adjustable The 2/3 of scope maximum, then presses the displacement value of the first hydraulic pump motor mechanism (3) as following formula (II) is adjusted:
When in brake hard intensity area, second hydraulic pump motor mechanism (6) discharge capacity is adjusted to maximum, and by the first hydraulic pressure (III) is adjusted the discharge capacity of pump motor mechanism (3) as the following formula, and electric machine controller (11) adjusts the generated output of motor to most Big value;
In above-mentioned formula (I), formula (II) and formula (III), Pb' be light and slow braking when the first hydraulic pump motor mechanism (3) displacement value, pbThe displacement value of first hydraulic pump motor mechanism (3), P during for average brakingbjFirst hydraulic pump motor mechanism during for brake hard (3) displacement value;PlbgrFor the 2/3 of second hydraulic pump motor mechanism (6) discharge capacity adjustable extent maximum;vlbFor the second hydraulic pump The tachometer value that motor mechanism (6) is detected in real time;ηlbgFor the volumetric efficiency of the second hydraulic pump motor mechanism (6);vbefFor motor Range of speeds median corresponding to highest generating efficiency area;ηbFor the volumetric efficiency of the first hydraulic pump motor mechanism (3);BzdFor Severity of braking value;FvFor the discharge capacity correction factor of the first hydraulic pump motor mechanism (3) formulated according to different hybrid electric vehicles, take Be worth scope for (1,2];PbminThe minimum injection rate value that can keep running well for the first hydraulic pump motor mechanism (3).
2. a kind of hybrid electric vehicle method for recovering brake energy based on static pressure transmission according to claim 1, its feature It is:The step 1) in be by the aperture size of the electronic brake pedal (9) of hybrid electric vehicle judge whether in braking State, when wherein aperture is 0, hybrid electric vehicle is in normal startup transport condition;During aperture > 0, hybrid electric vehicle is in On-position.
3. a kind of hybrid electric vehicle brake energy recovering system based on static pressure transmission, using mixing as claimed in claim 1 Power car method for recovering brake energy is reclaimed to hybrid electric vehicle braking energy, it is characterised in that:The system includes mixing Motor (1), the first hydraulic pump motor mechanism (3), the second hydraulic pump motor mechanism (6) and the wheel being sequentially connected on power car (7), the first hydraulic pump motor mechanism (3) and the second hydraulic pump motor mechanism (6) are electrically connected with entire car controller (10) respectively Connect;Entire car controller (10) is also electrically connected with power battery pack (12), electric machine controller (11) and electronic brake pedal (9) respectively Connect;Wherein:
Motor (1) is used to provide power under electric drive mode for the traveling of vehicle;Auxiliary mixing is dynamic under combination drive pattern The engine work of power car, power-assisted is provided for vehicle;In driving charging with Brake energy recovery pattern, being operated in generating State, is power battery pack (12) supplement electricity;
First hydraulic pump motor mechanism (3) and the second hydraulic pump motor mechanism (6) are used for the static pressure transmission for realizing hybrid electric vehicle, Realize the high efficiente callback of braking energy;
Electronic brake pedal (9) is used to provide brake pedal opening amount signal and aperture rate of change letter for entire car controller (10) Number;
Entire car controller (10) is used for the opening amount signal and aperture rate of change signal for obtaining electronic brake pedal (9) in real time, and sentences Whether disconnected hybrid electric vehicle is in on-position;When hybrid electric vehicle is in on-position, entire car controller (10) passes through electricity Machine controller (11) controlled motor (1) is operated in generating state;Entire car controller (10) is additionally operable to obtain motor (1) and the second liquid The tach signal of press pump motor mechanism (6), and the tach signal of the second hydraulic pump motor mechanism (6) is converted into GES, Current severity of braking letter is obtained by fuzzy reasoning with reference to the opening amount signal and aperture rate of change signal of electronic brake pedal (9) Number, then the working condition of the first hydraulic pump motor mechanism (3) and the second hydraulic pump motor mechanism (6) is adjusted respectively, drive it Motor (1) generates electricity and stored in power battery pack (12), realizes the recovery of braking energy;
The control signal that electric machine controller (11) is used to send entire car controller (10) is sent to motor (1), is believed according to control The mode of operation of the output speed of number controlled motor (1), torque and adjustment motor (1).
4. a kind of hybrid electric vehicle brake energy recovering system based on static pressure transmission according to claim 3, its feature It is:The power battery pack (12) is electrically connected by power battery pack SOC value sensor with entire car controller (10), power electric Pond group SOC value sensor is used for the SOC value for detecting power battery pack.
5. a kind of hybrid electric vehicle brake energy recovering system based on static pressure transmission according to claim 3, its feature It is:Motor speed sensor (2) is provided with the motor (1), motor speed sensor (2) is used to turn in the motor of acquisition Fast signal passes to electric machine controller (11), and CAN communication is used between the electric machine controller (11) and entire car controller (10) Mode.
6. a kind of hybrid electric vehicle brake energy recovering system based on static pressure transmission according to claim 3, its feature It is:The first hydraulic pump motor mechanism (3) include two pressure ports of A, B, and be separately provided for obtain A pressure ports and The pressure signal of B pressure ports, and it is converted into A mouthfuls of pressure sensors of hydraulic pump that current signal is transported to entire car controller (10) And B mouthfuls of pressure sensors (4) of hydraulic pump (5).
7. a kind of hybrid electric vehicle brake energy recovering system based on static pressure transmission according to claim 3 or 6, it is special Levy and be:The second hydraulic pump motor mechanism (6) is provided with for gathering its tach signal and transmitting to entire car controller (10) hydraulic motor speed sensor (8).
8. a kind of hybrid electric vehicle brake energy recovering system based on static pressure transmission according to claim 7, its feature It is:The first hydraulic pump motor mechanism (3) is becomes discharge capacity type, and the second hydraulic pump motor mechanism (6) is change discharge capacity type or fixed Discharge capacity type.
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