Background technology
Along with popularizing of hybrid vehicle, strong hybrid electric vehicle has all functions of idling start and stop, pure motor driving, parallel drive, the advance hybrid power systems such as middle start the engine, Brake energy recovery, whole vehicle power performance and the economy performance can be improved by the switching between various pattern, namely when automobile creep or low speed driving time, adopt pure motorized motions and kill engine to reduce oil consumption; When the pure motor-operated running state of vehicle turns to acceleration or climbing, motor cannot provide and meet automobile acceleration or the propulsive effort required for climbing, needs start the engine jointly to drive.
CVT(ContinuouslyVariableTransmission, toric transmission), primarily of compositions such as band wheels, metal tape, shift clutch, refer to accompanying drawing 1, be traditional C VT structural representation (containing turbine transformer).In transmission process, by pitch radius continually varying principal and subordinate movable belt pulley moving up and down on cone dish axle, the V-type groove that metal tape is formed along two belt wheels radially slides, and realizes the consecutive variations of transmitting ratio.Because CVT transmitting ratio can consecutive variations, therefore in strong hybrid electric car, carry that CVT can realize driving engine according to the intention of chaufeur, optimum matching between motor and change-speed box three, improve the fuel economy of strong hybrid electric vehicle, dynamic property, road-holding property and travelling comfort further.
Apparatus for starting is provided with, as start clutch, turbine transformer in traditional C VT automobile.Engine flywheel is connected with CVT internal mechanical pump by intermediary agency's (as face of fluid torque converter).At the Vehicle Starting Process initial stage, engine idle work, can driving CVT internal mechanical pump to provide operating fluid for CVT hydraulic efficiency pressure system, taking turns the needs of cylinder efficient and the needs of CVT speed-ratio regulation for meeting CVT belt in Vehicle Starting Process.In addition, because in traditional C VT automobile, driving engine is directly connected with CVT, when vehicle start, driving engine is in idling mode, driving engine can drive CVT internal mechanical pump, for CVT hydraulic efficiency pressure system provides enough operating fluids, for meeting the CVT belt wheel needs of cylinder efficient and the needs of CVT speed-ratio regulation in Vehicle Starting Process.But in order to realize the pure electronic operating mode of vehicle, needing to increase electromechanical coupling mechanism between transmitting set and CVT, referring to accompanying drawing 2, is strong hybrid electric CVT car drivetrain system agent structure schematic diagram.Hybrid power system is made up of a driving engine, ISG motor, a power-transfer clutch and a CVT, ISG rotor is connected with CVT internal mechanical pump, ISG rotor and mechanical pump are formed be rigidly connected, ISG rotor rotates, then drive CVT internal mechanical pump work.When the pure electronic operating mode starting of strong hybrid electric CVT car, engine speed is that 0, ISG motor speed rises gradually by 0.Bring a difficult problem thus, strong hybrid electric CVT car is at the pure electronic starting initial stage, ISG motor speed is lower, its rotating speed is not enough to drive CVT internal mechanical pump to export enough operating fluids, for meeting the CVT belt wheel needs of cylinder efficient and the needs of CVT speed-ratio regulation in Vehicle Starting Process, therefore, strong hybrid electric CVT car cannot be started to walk under pure electronic operating mode.
In order to reach above-mentioned functions, common design to increase a motor-drive pump in systems in which, and when ISG motor speed is by 0, rotating speed is lower when being not enough to drive CVT internal mechanical pump work, and motor-drive pump is the voltage supply of CVT hydraulic efficiency pressure system.At present on the market existing motor-drive pump not only expensive, volume is comparatively large, and, serviceability also has larger problem, such as: the motor feels hot that power is larger for motor-drive pump, cause the inefficiency of motor-drive pump, and can not long time continuous working, service life is shorter.Therefore motor-drive pump as auxiliary power pump, can only work at short notice.So just cause hydraulic efficiency pressure system to need two pumps, motor-drive pump and mechanical pump, thus add complexity, the cost of hydraulic efficiency pressure system, and the difficulty of arrangement.
Therefore, there is provided a kind of under pure electronic operating mode, use CVT internal mechanical pump as single hydraulic power source, driving engine is not worked, motor speed is from 0, motor cannot drive CVT internal mechanical pump for CVT belt wheel cylinder efficient and CVT speed-ratio regulation hydraulic pressure is provided when, solving the problem that hybrid power CVT car cannot be started to walk, is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
In view of this, the invention provides a kind of hybrid vehicle Hydraulic system and control method, to overcome in prior art due under pure electronic operating mode, when using CVT internal mechanical pump as single hydraulic power source, driving engine is not worked, motor speed from 0, motor cannot drive CVT internal mechanical pump for CVT belt wheel cylinder efficient and CVT speed-ratio regulation hydraulic pressure is provided when, the problem that hybrid power CVT car cannot be started to walk cannot be solved.
For achieving the above object, the invention provides following technical scheme:
A kind of hybrid vehicle hydraulic efficiency pressure system, for realizing pure electronic operating mode starting, this hydraulic efficiency pressure system comprises:
Realize the CVT hydraulic efficiency pressure system of clamping force control and Transmission Ratio Control;
Be connected with described CVT hydraulic efficiency pressure system, carry out the external hydraulic system of external hydraulic control;
Be electrically connected with described external hydraulic system, detect described external hydraulic system state and carry out car load and run the entire car controller HCU controlled;
Be electrically connected with described external hydraulic system and described entire car controller HCU, the ISG motor controlled by described entire car controller HCU.
Wherein, described external hydraulic system comprises:
The switching control pilot that control oil inlet and return opening are closed and opened;
Be connected with described switching control pilot, carry out the storage of hydraulic energy and the accumulator of release;
Be connected with described accumulator with described switching control pilot, and be electrically connected with described entire car controller HCU, detect the force value of hydraulic oil in described accumulator, described force value converted pressure signal is sent to the pressure sensor of described entire car controller HCU.
Preferably, described switching control pilot is electromagnetic valve, and the electromagnetic coil circuit of described switching control pilot is connected with the control circuit of described entire car controller HCU.
Preferably, described switching control pilot is the two position two-way valve that magnet control operating spring resets.
Wherein, described CVT hydraulic efficiency pressure system comprises:
Be connected with the ISG rotor of described ISG motor, to the CVT internal mechanical pump that hydraulic oil is carried up and down;
Be connected with described CVT internal mechanical pump, hydraulic oil carried out to the check valve of unidirectional conveying;
Be connected with described check valve, the CVT main oil way of hydraulic system of hydraulic oil is provided to described external hydraulic system;
Being connected with described CVT main oil way of hydraulic system with described CVT internal mechanical pump, holding the CVT oil pan tray of hydraulic oil for circulating.
Wherein, the signal of described pressure sensor is transmitted to described entire car controller HCU by signal line.
Preferably, the oil pump set by described CVT main oil way of hydraulic system is described CVT internal mechanical pump, by described ISG drive and control of electric machine.
The present invention, on the basis of above-mentioned disclosed a kind of hybrid vehicle hydraulic efficiency pressure system, also discloses a kind of hybrid vehicle hydraulic control method, and for realizing pure electronic operating mode starting, this hydraulic control method comprises:
Entire car controller HCU detects the force value in accumulator by pressure sensor;
Judge whether described force value is less than preset pressure value;
When detected pressures value is less than described preset pressure value, described entire car controller HCU control ISG machine operation, drives CVT internal mechanical pump work, and the energising of master cock control cock, to described accumulator pressurising;
When detected pressures value is not less than described preset pressure value, described entire car controller HCU control ISG motor quits work, and controls the reset of described switching control pilot;
When described hydraulic control system receives the starting signal that described entire car controller HCU sends, the described hydraulic energy release that described accumulator stores, for described CVT main oil way of hydraulic system provides operation pressure under described ISG motor low speed state.
Known via above-mentioned technical scheme, compared with prior art, the invention discloses a kind of hybrid vehicle Hydraulic system and control method, for realizing pure electronic operating mode starting, this hydraulic efficiency pressure system comprises: the CVT hydraulic efficiency pressure system realizing clamping force control and Transmission Ratio Control; Be connected with described CVT hydraulic efficiency pressure system, carry out the external hydraulic system of external hydraulic control; Be electrically connected with described external hydraulic system, detect described external hydraulic system state and carry out car load and run the entire car controller HCU controlled; Be electrically connected with described external hydraulic system and described entire car controller HCU, the ISG motor controlled by described entire car controller HCU.By external hydraulic system as pure electronic operating mode starting initial stage outside compensation device, wholely to fill, the process of bleeding off pressure is the storage and release being opened by entire car controller HCU master cock control cock and closed hydraulic energy, realize the operation pressure required for CVT hydraulic efficiency pressure system, and system using ISG motor as hydraulic efficiency power unit, without other additional power systems, achieve using CVT internal mechanical pump as single hydraulic power source, driving engine is not worked, motor speed is from 0, driven by motor CVT internal mechanical pump provides the situation of hydraulic pressure for CVT belt wheel cylinder efficient and CVT speed-ratio regulation, make the pure electronic operating mode starting of hybrid power CVT car.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
This application discloses a kind of hybrid vehicle Hydraulic system and control method, for realizing pure electronic operating mode starting, this hydraulic efficiency pressure system comprises: the CVT hydraulic efficiency pressure system realizing clamping force control and Transmission Ratio Control; Be connected with CVT hydraulic efficiency pressure system, carry out the external hydraulic system of external hydraulic control; Be electrically connected with external hydraulic system, detect external hydraulic system state and carry out car load and run the entire car controller HCU controlled; Be electrically connected with external hydraulic system and HCU, the ISG motor controlled by HCU.By external hydraulic system as pure electronic operating mode starting initial stage outside compensation device, wholely to fill, the process of bleeding off pressure is the storage and release being opened by HCU master cock control cock and closed hydraulic energy, realize the operation pressure required for CVT hydraulic efficiency pressure system, and ISG motor as hydraulic efficiency power unit, achieves and makes the pure electronic operating mode starting of hybrid power CVT car by system.
Refer to accompanying drawing 3, a kind of hybrid vehicle hydraulic system structure schematic diagram disclosed in the embodiment of the present invention.The embodiment of the invention discloses a kind of hybrid vehicle hydraulic efficiency pressure system, for realizing pure electronic operating mode starting, this hydraulic efficiency pressure system comprises: the CVT hydraulic efficiency pressure system 7 realizing clamping force control and Transmission Ratio Control; Be connected with CVT hydraulic efficiency pressure system 7, carry out the external hydraulic system 9 of external hydraulic control; Be electrically connected with external hydraulic system 9, detect external hydraulic system 9 state and carry out car load and run the entire car controller HCU8 controlled; Be electrically connected with external hydraulic system 9 and entire car controller HCU8, the ISG motor 62 controlled by entire car controller HCU8.
The ISG rotor 621 of above-mentioned ISG motor 62 is connected with CVT internal mechanical pump 71, and ISG rotor 621 and CVT internal mechanical pump 71 are formed and is rigidly connected, ISG rotor 621 rotates, then drive CVT internal mechanical pump 71 to work.
Said external hydraulic efficiency pressure system 9 comprises: the switching control pilot 91 that control oil inlet and return opening are closed and opened; Be connected with switching control pilot 91, carry out the storage of hydraulic energy and the accumulator 92 of release; Be connected with accumulator 92 with switching control pilot 91, and be electrically connected with entire car controller HCU8, detect the force value of hydraulic oil in accumulator 92, the pressure sensor 93 controlled by entire car controller HCU8.Energy storage 92 can supplement pressure needed for CVT hydraulic circuit 74 rapidly at the pure electronic operating mode starting initial stage.When ensure that ISG motor 62 slow speed of revolution, CVT hydraulic circuit 74 can normally work.
The signal of above-mentioned pressure sensor 93 is transmitted to described entire car controller HCU8 by signal line.The force value of hydraulic oil is detected by pressure sensor 93.After reaching setup pressure value, entire car controller HCU8 master cock control cock 91 is closed, and relies on energy storage 92 to store hydraulic energy, realizes pressurize.When hydraulic oil pressure force value once drop to minimum limits value, entire car controller HCU8 control ISG motor 62 works, thus drives CVT internal mechanical pump 71 to work, and Simultaneous Switching control cock 91 is opened, energy storage 92 pressurising.Oil pump set by described hydraulic circuit 74 is described CVT internal mechanical pump 71, is driven by described ISG motor.
Above-mentioned CVT hydraulic efficiency pressure system 7 comprises: be connected with the ISG rotor 621 of ISG motor 62, to the CVT internal mechanical pump 71 that hydraulic oil is carried up and down; Be connected with CVT internal mechanical pump 71, hydraulic oil carried out to the check valve 72 of unidirectional conveying; Be connected with check valve 72, externally hydraulic efficiency pressure system 9 provides the CVT hydraulic circuit 74 of hydraulic oil; Being connected with CVT hydraulic circuit 74 with CVT internal mechanical pump 71, holding the CVT oil pan tray 73 of hydraulic oil for circulating.Hydraulic oil by CVT internal mechanical pump 71, is supplied to whole hydraulic efficiency pressure system through check valve 72 by CVT oil pan tray 73.
The pure electronic operating mode starting-up process of strong hybrid electric CVT car sends instruction by entire car controller HCU8 and controls, and in starting-up process, energy storage 92 first should be made to store oil pressure; During starting, energy storage 92 bleeds off pressure rapidly; Finally, vehicle start.
The present invention adopts energy storage 92 as pure electronic operating mode starting initial stage outside compensation device, wholely to fill, the process of bleeding off pressure opened by entire car controller HCU8 master cock control cock 91, closed.In external hydraulic system 9, being provided with the mechanism storing hydraulic energy, hydraulic energy can being stored into certain pressure, pressure needed for CVT hydraulic circuit 74 can be provided rapidly when starting to walk.Also be provided with the pressure that pressure sensor 93 detects the mechanism storing hydraulic energy, after pressure reaches setting value, switching control pilot 93 is closed; When insufficient pressure, switching control pilot 93 is opened.
The technical solution used in the present invention is: as shown in Figure 3, the pure electronic operating mode starting external hydraulic system of this strong hybrid electric CVT car provided, described external hydraulic system is provided with a switching control pilot 91, is communicated with by CVT main oil way of hydraulic system 74 with energy storage 92.
CVT hydraulic efficiency pressure system 7 described above is mainly used in realizing clamping force control and Transmission Ratio Control.As shown in Figure 4, its working process is: the pressure of mechanical pump outlet is regulated by clamping force control valve 104, directly acts on flower wheel oil cylinder 102, to control the tensile force to metal drive belt 3; Another part pressure oil enters into driving wheel oil cylinder 101, with the change of control CVT transmission speed ratio through the adjustment of Transmission Ratio Control valve 103.
Preferably, on the basis of technique scheme, described switching control pilot 91 can be electromagnetic valve, and the circuit of its magnet coil is connected with the control circuit of described entire car controller HCU8.
Adopt the mechanism of electromagnetic valve, make valve can be connected with entire car controller HCU8 and accept it and control, realize necessary operation.Its control program is general prepared in advance good, is stored in entire car controller HCU8.
Preferably, the two position two-way valve that described switching control pilot 91 can reset for magnet control operating spring.During electromagnet no power, spring reset, oil inlet and return opening are closed, and feasible system pressure keeps; During electromagnet energising, spring-compressed, oil inlet is to return opening bidirectional opening.
Further, CVT hydraulic efficiency pressure system, strong hybrid electric electromechanical coupling hydraulic efficiency pressure system integrate by the present invention, save arrangement space, further, the present invention controls simply, easily realizes and liquid can repeated usage, ISG motor is used as hydraulic efficiency power unit, without other additional power systems.
The invention discloses a kind of hybrid vehicle hydraulic efficiency pressure system, for realizing pure electronic operating mode starting, this hydraulic efficiency pressure system comprises: the CVT hydraulic efficiency pressure system realizing clamping force control and Transmission Ratio Control; Be connected with described CVT hydraulic efficiency pressure system, carry out the external hydraulic system of external hydraulic control; Be electrically connected with described external hydraulic system, detect described external hydraulic system state and carry out car load and run the entire car controller HCU controlled; Be electrically connected with described external hydraulic system and described entire car controller HCU, the ISG motor controlled by described entire car controller HCU.By external hydraulic system as pure electronic operating mode starting initial stage outside compensation device, wholely to fill, the process of bleeding off pressure is the storage and release being opened by entire car controller HCU master cock control cock and closed hydraulic energy, realize the operation pressure required for CVT hydraulic efficiency pressure system, and system using ISG motor as hydraulic efficiency power unit, without other additional power systems, achieve using CVT internal mechanical pump as single hydraulic power source, driving engine is not worked, motor speed is from 0, driven by motor CVT internal mechanical pump provides the situation of hydraulic pressure for CVT belt wheel cylinder efficient and CVT speed-ratio regulation, make the pure electronic operating mode starting of hybrid power CVT car.
On the basis of embodiment disclosed in the invention described above, in order to realize the object identical with technique scheme, present invention also offers the control method of the pure electronic operating mode starting of the above strong hybrid electric CVT car, refer to accompanying drawing 5, a kind of diagram of circuit of hybrid vehicle hydraulic control method disclosed in the embodiment of the present invention, concrete technical scheme steps comprises:
Step 501: entire car controller HCU detects the force value in accumulator by pressure sensor.
Step 502: judge whether described force value is less than preset pressure value.
Step 503: when detected pressures value is less than described preset pressure value, described entire car controller HCU control ISG machine operation, drives CVT internal mechanical pump work, and the energising of master cock control cock, to described accumulator pressurising.
Step 504: when detected pressures value is not less than described preset pressure value, described entire car controller HCU control ISG motor quits work, and controls the reset of described switching control pilot.
Step 505: when described hydraulic control system receives the starting signal that described entire car controller HCU sends, the described hydraulic energy release that described accumulator stores, for described CVT main oil way of hydraulic system provides operation pressure under described ISG motor low speed state.
A kind of hybrid vehicle hydraulic control method disclosed by the invention, by external hydraulic system as pure electronic operating mode starting initial stage outside compensation device, wholely to fill, the process of bleeding off pressure is the storage and release being opened by HCU master cock control cock and closed hydraulic energy, realize the operation pressure required for CVT hydraulic efficiency pressure system, and ISG motor as hydraulic efficiency power unit, achieves and makes the pure electronic operating mode starting of hybrid power CVT car by system.
Further, refer to accompanying drawing 6, concrete workflow and hydraulic pressure transfer realizing route are: before vehicle start, and car key is positioned on gear car load and powers on, entire car controller HCU8 judges SOC> setting value (SOC is electrokinetic cell electricity), and vehicle enters pure electronic operating mode starting.Entire car controller HCU8 detects the force value of energy storage 92 by pressure sensor 93.When force value is less than pre-set value A(as 3MPa) time, entire car controller HCU8 control ISG motor 62 works, thus drive CVT internal mechanical pump 71 to work, entire car controller HCU8 master cock control cock 91 is energized simultaneously, it is made to be in spring-compressed state, enter, return opening open, energy storage 92 pressurising; When force value equals setting value A(as 3MPa) time, the power-off of entire car controller HCU8 master cock control cock 91, make it be in spring reset state, enter, return opening close, energy storage 92 storage liquid pressure energy.Entire car controller HCU8 control ISG motor 62 quits work, and waits for vehicle start signal.Hydraulic pressure transfer path is achieved in that hydraulic pressure is entered energy storage 92 from CVT oil pan tray 73 by CVT internal mechanical pump 71, check valve 72, switching control pilot 91.
During vehicle start, car key is positioned at start gear, gear is in D gear (forward gear) or R gear (backward gear), entire car controller HCU8 master cock control cock 91 is energized, make it be in spring-compressed state, enter, return opening open, energy storage 92 discharges hydraulic pressure rapidly, as main oil sources and CVT internal mechanical pump 71 jointly for CVT hydraulic circuit 74 provides hydraulic pressure, for CVT power-transfer clutch joint, belt wheel clamping, system lubrication cooling etc.; Then RELEASE PARKINGBRAKE, get off the brakes pedal, stepping on accelerator pedal, ISG motor 62 is started working, vehicle start.Hydraulic pressure transfer path is achieved in that wherein a road hydraulic pressure enters CVT hydraulic circuit 74 from energy storage 92 by switching control pilot 91; Another road hydraulic pressure enters CVT hydraulic circuit 74 from CVT oil pan tray 73 by CVT internal mechanical pump 71, check valve 72.
When vehicle has of short duration stopping in the process of moving, ISG motor 62 quits work, and CVT internal mechanical pump 71 does not work, energy storage 92 storage liquid pressure energy.When vehicle needs again to start to walk, RELEASE PARKINGBRAKE, get off the brakes pedal, stepping on accelerator pedal, ISG motor 62 restarts work, and entire car controller HCU8 master cock control cock 91 is energized simultaneously, it is made to be in spring-compressed state, enter, return opening opens, energy storage 92 discharges hydraulic pressure rapidly, provides hydraulic pressure as main oil sources and CVT internal mechanical pump 71 are common for CVT hydraulic circuit 74, for CVT power-transfer clutch joint, belt wheel clamping, system lubrication cooling etc., vehicle start.Hydraulic pressure transfer path is achieved in that wherein a road hydraulic pressure enters CVT hydraulic circuit 74 from energy storage 92 by switching control pilot 91; Another road hydraulic pressure, from CVT internal mechanical pump 71, enters CVT hydraulic circuit 74 by check valve 72.
After vehicle start, ISG motor 62 normally works, and drives CVT internal mechanical pump 71 to pump hydraulic oil from CVT oil pan tray 73, is not only CVT hydraulic circuit 74 voltage supply but also be energy storage 92 pressurising.Entire car controller HCU8 detects energy storage 92 pressure by pressure sensor 93, when pressure is less than setting value A(as 3MPa) time, entire car controller HCU8 master cock control cock 91 is energized, be in spring-compressed state, enter, return opening open, energy storage 92 pressurising; When force value equals setting value A(as 3MPa) time, the power-off of entire car controller HCU8 master cock control cock 91, be in spring reset state, enter, return opening close, energy storage 92 storage liquid pressure energy.Hydraulic pressure transfer path is achieved in that hydraulic pressure from CVT oil pan tray 73 through CVT internal mechanical pump 71, check valve 72, then two-way is divided into, switching control pilot 91 of wherein leading up to enters in energy storage 92, and another road directly enters in CVT hydraulic circuit 74.
In the process of moving, entire car controller HCU8 continuous can detect energy storage 92 pressure by pressure sensor 93 and whether reach setting value A(as 3MPa vehicle).If equal A(as 3MPa), then entire car controller HCU8 master cock control cock 91 power-off, be in spring reset state, enter, return opening close, energy storage 92 is without the need to pressurising.If be less than B(as 2.5MPa), then entire car controller HCU8 master cock control cock 91 is energized, be in spring-compressed state, enter, return opening open, while ISG motor 62 drives CVT internal mechanical pump 71, for energy storage 92 pressurising, until pressure sensor 93 detects that force value is that A(is as 3MPa), then the power-off of entire car controller HCU8 master cock control cock 91, is in spring reset state, enter, return opening close, energy storage 92 stores hydraulic energy.Hydraulic pressure transfer path is achieved in that wherein a road hydraulic pressure enters energy storage 92 from CVT oil pan tray 73 by CVT internal mechanical pump 71, check valve 72, switching control pilot 91; Another road hydraulic pressure is entered CVT hydraulic circuit 74 from CVT oil pan tray 73 by CVT internal mechanical pump 71, check valve 72.
In sum: the invention discloses a kind of hybrid vehicle Hydraulic system and control method, for realizing pure electronic operating mode starting, this hydraulic efficiency pressure system comprises: the CVT hydraulic efficiency pressure system realizing clamping force control and Transmission Ratio Control; Be connected with described CVT hydraulic efficiency pressure system, carry out the external hydraulic system of external hydraulic control; Be electrically connected with described external hydraulic system, detect described external hydraulic system state and carry out car load and run the entire car controller HCU controlled; Be electrically connected with described external hydraulic system and described entire car controller HCU, the ISG motor controlled by described entire car controller HCU.By external hydraulic system as pure electronic operating mode starting initial stage outside compensation device, wholely to fill, the process of bleeding off pressure is the storage and release being opened by entire car controller HCU master cock control cock and closed hydraulic energy, realize the operation pressure required for CVT hydraulic efficiency pressure system, and system using ISG motor as hydraulic efficiency power unit, without other additional power systems, achieve using CVT internal mechanical pump as single hydraulic power source, driving engine is not worked, motor speed is from 0, driven by motor CVT internal mechanical pump provides the situation of hydraulic pressure for CVT belt wheel cylinder efficient and CVT speed-ratio regulation, make the pure electronic operating mode starting of hybrid power CVT car.
In addition, the present invention is equally applicable to carry AT, DCT etc. when vehicle start, needs the pure electronic starting operating mode of motor vehicle driven by mixed power setting up hydraulic system pressure in advance.
In this specification sheets, each embodiment adopts the system of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For method disclosed in embodiment, because it is corresponding with system disclosed in embodiment, so description is fairly simple, relevant part illustrates see components of system as directed.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.