CN102059940A - Automobile fuel-electricity full hybrid power system - Google Patents
Automobile fuel-electricity full hybrid power system Download PDFInfo
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Abstract
The invention discloses an automobile fuel-electricity full hybrid power system which comprises an engine, a planetary gear mechanism connected with the engine, a motor and a gear box connected with the planetary gear mechanism, wherein the output end of the gear box is in fit connection with a drive shaft of wheels. The system is characterized in that the planetary gear mechanism at least comprises three gear shafts, i.e. a gear ring shaft, a sun wheel shaft and a planetary carrier shaft; the rotor of the motor is connected with the sun wheel shaft, and the sun wheel shaft is in fit connection with the gear ring shaft through a clutch; the output end of the engine is in fit connection with the gear ring shaft; the gear box is in fit connection with the output end of the planetary carrier shaft; the drive shaft of the wheels and the output end of the gear box are in fit connection; and a brake is arranged on the shaft of the engine. The system better eliminates an impulsive torque while the engine is started and can ensure that the engine is stably started when an automobile is in pure electric drive running; and when the clutch is coupled, a negative torque generated by the shaft of the engine can be weakened or counteracted by the inertia moments of the sun wheel shaft and the motor.
Description
Technical field
The invention belongs to automobile and close power system, be specifically related to the full hybrid power system of a kind of automobile oil electricity.
Background technology
In prior art, US Patent 6569054 discloses a kind of parallel oil electric mixed dynamic system, and the electromechanical coupling mechanism of this system mainly is made of a driving engine, motor, a cover sun and planet gear, a magnetic clutch and a change speed gear box.Wherein the sun wheel shaft of sun and planet gear and gear ring axle be as the moment input shaft, and its pinion carrier axle is as the moment output shaft, and sun wheel shaft and gear ring axle link with the axle of driving engine and motor respectively, and the moment output shaft links by the axle drive shaft of change speed gear box and wheel.The effect of this sun and planet gear is that the driving torque that is used for hybrid-engine and motor output comes common powered vehicle.Described magnetic clutch is connected between sun wheel shaft and the pinion carrier axle, is used for three axles of mechanical caging sun and planet gear, and during its coupling, three axles of sun and planet gear are with an output speed powered vehicle; When it separated, three axles of sun and planet gear rotated with speed separately respectively.Two propulsions source of this system are that driving engine and motor are in parallel, and their output torque all can act directly on the axle drive shaft of wheel by mechanical drive, therefore, and the power transmission efficiency height, and only used a motor, simple in structure.But this system exists a bigger shortcoming: can not kill engine in vehicle ' exactly, this be because when driving engine do not export driving torque, when exporting driving torque separately by motor, this driving torque can pass to reverse moment of torsion of engine shaft after by sun and planet gear, can cause the driving engine reversing, this is unallowed, therefore, it does not possess pure electricity driving function.Yet, for the full hybrid power system of an oil electricity, possess that pure electricity drives and under pure electricity drives start the engine be very important.This function has been arranged, and vehicle just can be creeped or low speed driving under situation about killing engine in pure electricity driving, and then reduces oil consumption; When vehicle needs brish acceleration or moves fast,, carry out the common driving of oil electricity by the direct start the engine of coupling mechanism.It is a very mode of operation of fuel saving that pure electricity drives, and it seems particularly important when vehicle ' is on urban highway.Therefore, possessing this function becomes and distinguishes vehicle and be one of the item key of " the full hybrid vehicle of oil electricity ".
Chinese patent 200810184141.8 is disclosed to be a kind of electromechanical power coupling mechanism of automobile oil electricity hybrid power system.It is made up of a driving engine, a motor, an electric machine controller, a sun and planet gear at least, and between engine shaft and casing a free-wheel clutch is installed, and is provided with power-transfer clutch between sun wheel and gear ring.The gear ring axle of described sun and planet gear and sun wheel shaft link with engine shaft and motor shaft respectively as the moment input shaft, and its pinion carrier axle links as the input shaft of moment output shaft and change speed gear box.This system has realized that pure electricity drives and the middle start the engine that travels, and eliminates the negative impulsive torque on the vehicle drive shaft simultaneously, keeps vehicle ' steady.But there is a problem in this mechanism: under pure electronic operating mode, the energy regeneration braking effect is bad.Applying the energy regeneration glancing impact, motor output negative torque acts on the sun wheel, and this moment of torsion acts on the gear ring by satellite gear, produces positive moment of torsion, makes driving engine that the trend of forward rotation be arranged; And free-wheel clutch can not just change by limiting engine, and then causes expenditure of energy serious, has reduced fuel economy; Simultaneously, also cause electric braking force uncontrollable, can't obtain good braking effect.
Summary of the invention
The objective of the invention is at the shortcoming in the prior art, provide a kind of automobile oil electricity full hybrid power system, it can guarantee to use under the prerequisite of a motor, possess that pure electricity drives and the function of start the engine under pure electricity drives, impulsive torque when eliminating clutch engagement preferably can make vehicle smooth starting driving engine in pure electricity driving is travelled, and can effectively implement the energy regeneration braking, guarantee that braking is reliable, improve fuel economy.
The full hybrid power system of a kind of automobile oil electricity of the present invention, comprise driving engine, with driving engine bonded assembly sun and planet gear, motor, with sun and planet gear bonded assembly change speed gear box, the mouth of change speed gear box and the axle drive shaft of wheel are connected, it is characterized in that: described sun and planet gear has three gear wheel shafts at least, i.e. gear ring axle, sun wheel shaft and pinion carrier axle; The rotor of motor is connected with sun wheel shaft, sun wheel shaft is connected by power-transfer clutch and gear ring axle, the mouth of driving engine and gear ring axle are connected, and the mouth of change speed gear box and pinion carrier axle is connected, and the axle drive shaft of wheel and the mouth of change speed gear box are connected; One drg is located on the axle of driving engine.
The full hybrid power system of described a kind of automobile oil electricity also is provided with an isolator on the axle of driving engine.
The full hybrid power system of described a kind of automobile oil electricity, the moment of inertia J on its described sun wheel shaft
STooth number Z with sun wheel
SRatio equal moment of inertia J on the gear ring axle
RTooth number Z with the gear ring axle
RRatio, promptly satisfy equation:
J
S/Z
S＝J
R/Z
R。
The present invention is by increasing on a drg or the basis at drg the mode of a free-wheel clutch in parallel again on the engine shaft, to prevent engine shaft counter-rotating when pure electricity drives, make it possess the function of the pure electricity driving and the middle start the engine that travels, eliminated impulsive torque; Can also stop driving engine just to change, guarantee energy regeneration brake system normal operation, effectively implement the energy regeneration braking, keep high energy regeneration rate.
Aspect the elimination impulsive torque:
Impulsive torque when the present invention has eliminated start the engine preferably can make vehicle smooth starting driving engine in pure electricity driving is travelled.During Clutch Coupling, the negative torque that engine shaft produces can be weakened by the moment of inertia of sun wheel shaft and motor or offset.
Before the startup, the rotating speed of sun tooth axle S is higher than the rotating speed of pinion carrier axle C, therefore, when Clutch Coupling, it is positive moment of torsion that moment of inertia on the sun wheel shaft S acts on pinion carrier axle C, the negative torque that moment of inertia produced on this positive moment of torsion and the engine shaft R exists simultaneously, acts on simultaneously on the pinion carrier axle C.Derive according to the principle of three axle conservation of angular momentum of the forward and backward sun and planet gear of Clutch Coupling and to draw: this mechanism satisfies the moment of inertia J on the sun wheel shaft S
sTooth number Z with sun gear S '
sRatio, equal the moment of inertia J on the gear ring axle R
RTooth number Z with gear ring gear R '
RThe ratio,
Be Js/Zs=J
R/ Z
RSet up
Then during Clutch Coupling, can offset fully by the negative torque that the engine inertia square produces on pinion carrier axle C.That is to say, when this mechanism satisfies Js/Zs=J
R/ Z
R, system can make the driving engine smooth starting by direct coupled clutch in pure electricity driving is travelled, and can not cause the vehicle vibrations because of start the engine.
Aspect braking:
Braking under the pure motorized motions situation, power-transfer clutch keep separating, and drg keeps braking mode, and driving engine is not worked; Motor output negative torque T＜0 acts on the sun wheel shaft; Because the force of inertia of vehicle acts on the pinion carrier axle, cause the gear ring axle to have the trend of forward rotation, the counter torque but drg imposes restriction stops gear ring axle and driving engine just to change; The brake torque of motor output and constraint reaction square are synthetic by planetary wheel, stack, make car retardation by pinion carrier axle C output brake torque.
Braking under the engine operation situation, before the braking, drg 7 discharges, engine operation. and after beginning braking, power-transfer clutch 6 separates, and drg 7 converts braking mode to by release position, and driving engine is stopped operating; Though the force of inertia of vehicle acts on the pinion carrier axle, make the gear ring axle have the trend of forward rotation, drg can stop gear ring axle and driving engine just to change by the counter torque that imposes restriction; Motor output this moment negative torque acts on the sun wheel shaft; The brake torque of motor output and constraint reaction square are synthetic by sun and planet gear, stack, export total brake torque by the pinion carrier axle, make car retardation.
The present invention can effectively implement the energy regeneration braking, keep high energy regeneration rate.
Description of drawings
Fig. 1 is the present invention program one a structural representation.
Fig. 2 is the velocity diagram of three gear wheel shafts of sun and planet gear.
Fig. 3 is the moment diagram of three gear wheel shafts of sun and planet gear.
The velocity diagram of sun and planet gear three gear wheel shafts when Fig. 4 is motor independent drive vehicle.
Fig. 5 is the velocity diagram of electricity three gear wheel shafts of sun and planet gear when driving start the engine under the operating mode.
Fig. 6 is the cireular frequency scheme drawing before and after the Clutch Coupling.
Fig. 7 is the present invention program two a structural representation.
The specific embodiment
Embodiment one:
Referring to the full hybrid power system of a kind of automobile oil electricity shown in Figure 1, comprise driving engine 1, with driving engine bonded assembly sun and planet gear 3, motor 2, with sun and planet gear bonded assembly change speed gear box 4, the mouth of change speed gear box and the axle drive shaft of wheel are connected, it is characterized in that: described sun and planet gear 3 has three gear wheel shafts at least, i.e. gear ring axle R, sun wheel shaft S and pinion carrier axle C; The rotor of motor 2 is connected with sun wheel shaft S, sun wheel shaft S is connected with gear ring axle R by power-transfer clutch 6, the mouth of driving engine 1 and gear ring axle R are connected, and change speed gear box 4 is connected with the mouth of pinion carrier axle C, and the mouth of the axle drive shaft of wheel and change speed gear box 4 is connected; One drg 7 is located on the axle of driving engine 1.
Between described sun wheel shaft S and gear ring axle R, be provided with a power-transfer clutch 6, be used for three gear wheel shafts of sun and planet gear 3 are locked together.Described sun and planet gear is an existing mechanical mechanism, and according to the principle of work of sun and planet gear as can be known, the moment input and output of its three axles relation can be exchanged, and for example driving engine can connect sun wheel shaft, motor connects gear ring.After this moment input, the output relation conversion, the technique effect that is reached with Fig. 1 structure is identical, and they belong to the replacement of equivalent structure, all belong to protection scope of the present invention.Therefore, the present invention only launches explanation with regard to the connection mode among Fig. 1, and in the narration below, other conversion connects can in like manner derive according to this kind connection mode.In addition, described power-transfer clutch 6 also can be installed between any two gear wheel shafts, all can realize the function that three gear wheel shafts lock together, and originally exemplifies out above-mentioned a kind of specific connection mode, so that following derivation.
According to the described connection structure of Fig. 1, sun wheel shaft rotational speed omega
S, gear ring axle rotational speed omega
RWith pinion carrier axle rotational speed omega
CBetween length velocity relation can represent the Z among the figure with Fig. 2
SAnd Z
RBe respectively the number of teeth of sun wheel S and gear ring R, arrow has then been pointed out three positive dirctions that axle rotates respectively.And the speed of three axles has following known formula formula:
ω
S·Z
S+ω
R·Z
R＝ω
C·(Z
S+Z
R)(1)
According to equation (1), when wherein the speed of any two axles was known, the rotating speed of pinion carrier axle just can be determined, and can calculate according to equation (1).
According to the annexation of this mechanism, motor 2 acts on the torque T on the sun wheel shaft
SAct on torque T on the gear ring axle with driving engine 1
RTorque T with the output of pinion carrier axle
CBetween moment of torsion relation can represent the Z among Fig. 3 with Fig. 3
SAnd Z
RBe respectively the number of teeth of sun wheel S ' and gear ring R ', arrow has then been pointed out the direction of three axle positive torques respectively, and has following known formula formula:
T
C＝T
S+T
R
According to equation (2), when wherein any one moment of torsion was known, then the moment of torsion of diaxon was determined in addition, and can calculate with equation (2).
Referring to Fig. 1, under the operating mode of engine shutdown, motor independent drive vehicle, power-transfer clutch 6 separates, drg 7 brakings, and driving engine 1 is not worked, and its rotating speed is zero, and change speed gear box 4 is set to " driving " or " reversing " position; Motor shaft is with speed omega
SForward rotation, and output drive strength square T=T
STo sun wheel shaft S; Because vehicle drag acts on the pinion carrier, cause gear ring to have the trend of counter-rotating, and gear ring axle R is connected with engine shaft, so driving engine 1 can reverse; So, impose restriction for drg 7 and can stop the gear ring counter-rotating, and then prevent the driving engine reversing, reduced expenditure of energy.The output torque of motor and constraint reaction square are synthetic by planetary wheel, stack, and by pinion carrier output, pinion carrier axle C will export a drive torque
T
C＝T
S+T
R＝T·(Z
S+Z
R)/Z
S，
Its speed is ω
C=ω
S.Z
S/ (Z
S+ Z
R), powered vehicle is advanced or is fallen back, thereby realizes that pure electricity drives function.
Referring to Fig. 4, when motor 2 independent drive vehicles, 1 in driving engine is static, and its speed is zero, and the speed of sun and planet gear three axle R, S, C is shown in Fig. 5 solid line.At this moment, start the engine 1, drg 7 need be discharged, be controlled at certain value simultaneously with power-transfer clutch 6 closures, and with Motor torque.At this moment on engine crankshaft, driving engine has the trend of forward rotation to Motor torque by clutch transmits.Owing to discharge, drg allows engine free ground forward rotation, so driving engine quickened and start, and is shown in dotted line each speed in the start the engine process among Fig. 5.Have certain moment of inertia on the engine shaft, certain moment of inertia also arranged on the sun wheel shaft,
Promptly work as J
S/ Z
S=J
R/ Z
RThe time,
Before power-transfer clutch 6 couplings, engine shaft speed is zero, and during coupling, engine shaft and sun wheel shaft will lock together, and impulsive torque can not occur, and driving engine can smooth starting.Specify as follows:
The negative torque that engine shaft R is produced on pinion carrier axle C can be weakened by the moment of inertia of sun wheel shaft S and motor or offset.As seen from Figure 5, before the startup, the rotating speed of sun wheel shaft S is higher than the rotating speed of pinion carrier axle C, therefore, when power-transfer clutch 6 couplings, sun wheel shaft S tends to the moment of torsion to pinion carrier axle C effect one forward, and the reactive torque that this positive moment of torsion and engine shaft R are produced produces simultaneously, direction is opposite, and the effect of pinion carrier C is cancelled out each other.For reaching the purpose of offsetting fully, the present invention has carried out following derivation according to the forward and backward conservation of angular momentum principle of power-transfer clutch 6 couplings:
As shown in Figure 6, the speed of supposing sun wheel shaft S is ω
S,, the speed of gear ring axle R is ω
R, the speed of pinion carrier axle C is ω
C, the total moment of momentum L of this mechanism then
0For:
L
0＝ω
SJ
S+ω
RJ
R+ω
CJ
C (3)
ω in the formula
SAnd J
SBe respectively the cireular frequency and the moment of inertia of sun wheel shaft S and motor 2, ω
RAnd J
RBe respectively cireular frequency and the moment of inertia on it of engine shaft R; ω
CAnd J
CBe respectively cireular frequency and the moment of inertia of pinion carrier axle C.
Suppose that again this mechanism satisfies: the moment of inertia J on the sun wheel shaft S
SEqual moment of inertia J on the engine shaft R with the ratio of the sun wheel number of teeth
RWith the gear ring tooth number Z
RThe ratio, that is:
J
S/Z
S＝J
R/Z
R (4)
With equation (1) and (4) substitution equation (3), can get:
L
0＝ω
SJ
S+ω
RJ
R+ω
CJ
C＝ω
C(J
S+J
R+J
C) (5)
This equation (5) is under the condition that equation (4) is set up, the moment of momentum of system before power-transfer clutch 6 couplings.
After power-transfer clutch 6 couplings, three axles of sun and planet gear are with same speed omega
1Rotate, as shown in Figure 6, its total moment of momentum is:
L
1＝ω
1(J
S+J
R+J
C) (6)
Because power-transfer clutch 6 is coupled in a short period of time and locks, the moment of face of mechanism (as: friction moment) is very little to the influence of its total moment of momentum, ignores at this, so that analyze.According to law of conservation of moment of momentum, the total moment of momentum of mechanism is forward and backward the remaining unchanged of coupling, that is:
L
0＝L
1 (7)
With equation (5) and (6) substitution (7), can get:
L
0＝ω
C(J
S+J
R+J
C)＝L
1＝ω
1(J
S+J
R+J
C)
Can get thus:
ω
1＝ω
C (8)
Show that by above-mentioned derivation under the condition that equation (4) satisfies, the speed of pinion carrier axle C is not subjected to the influence of power-transfer clutch 6 couplings.In other words, if system satisfies J
S/ Z
S=J
R/ Z
R, then during power-transfer clutch 6 coupling, can offset fully in the negative torque that pinion carrier axle c produces by the moment of inertia of engine shaft.Therefore, if J can accomplish in this mechanism
S/ Z
S=J
R/ Z
R, can realize that then pure electricity drives the function of smooth starting driving engine down.
After driving engine 1 starts, engine shaft 2 forward rotation, drg 7 keeps release position, allow driving engine 1 forward rotation freely, so driving engine 1 can normal operation.
Damped condition under the pure motorized motions situation: power-transfer clutch keeps separating, and drg keeps braking mode, and driving engine is not worked; Motor output negative torque T＜0 acts on the sun wheel; Because the force of inertia of vehicle acts on the pinion carrier, cause gear ring to have the trend of forward rotation, the counter torque but drg imposes restriction stops gear ring and driving engine just to change; The brake torque of motor output and constraint reaction square are synthetic by planetary wheel, stack, by pinion carrier output brake torque
T
C=T
S+ T
R=T (Z
S+ Z
R)/Z
S＜0, make car retardation.
Damped condition under the engine operation situation: before the braking, drg 7 discharges, engine operation. and after beginning braking, power-transfer clutch 6 separates, and drg 7 converts braking mode to by release position, and driving engine is stopped operating; Though the force of inertia of vehicle acts on the pinion carrier, make gear ring have the trend of forward rotation, drg can stop gear ring and driving engine just to change by the counter torque that imposes restriction; Motor output this moment negative torque acts on the sun wheel; The brake torque of motor output and constraint reaction square are synthetic by sun and planet gear, stack, export total brake torque by pinion carrier, make car retardation.
Embodiment two:
Referring to the full hybrid power system of a kind of automobile oil electricity shown in Figure 7, comprise driving engine 1, with driving engine bonded assembly sun and planet gear 3, motor 2, with sun and planet gear bonded assembly change speed gear box 4, the mouth of change speed gear box and the axle drive shaft of wheel are connected, it is characterized in that: described sun and planet gear 3 has three gear wheel shafts at least, i.e. gear ring axle R, sun wheel shaft S and pinion carrier axle C; The rotor of motor 2 is connected with sun wheel shaft S, sun wheel shaft S is connected with gear ring axle R by power-transfer clutch 6, the mouth of driving engine 1 and gear ring axle R are connected, and change speed gear box 4 is connected with the mouth of pinion carrier axle C, and the mouth of the axle drive shaft of wheel and change speed gear box 4 is connected; One drg 7 is located on the axle of driving engine 1, also is provided with an isolator 8 on the axle of driving engine.
Between described sun wheel shaft S and gear ring axle R, be provided with a power-transfer clutch 6, be used for three gear wheel shafts of sun and planet gear 3 are locked together.
Described sun and planet gear is an existing mechanical mechanism, and according to the principle of work of sun and planet gear as can be known, the moment input and output of its three axles relation can be exchanged, and for example driving engine can connect sun wheel shaft, motor connects gear ring.After this moment input, the output relation conversion, the technique effect that is reached with Fig. 1 structure is identical, and they belong to the replacement of equivalent structure, all belong to protection scope of the present invention.Therefore, the present invention only launches explanation with regard to the connection mode among Fig. 1, and in the narration below, other conversion connects can in like manner derive according to this kind connection mode.In addition, described power-transfer clutch 6 also can be installed between any two gear wheel shafts, all can realize the function that three gear wheel shafts lock together.
When drg effect (braking), with the rotation of limiting engine axle.The principle of work of system under various operating modes is as follows:
Under pure electronic operating mode: power-transfer clutch 6 separates, drg 7 brakings or release, and driving engine is not worked, motor forward drive sun wheel.Because vehicle drag acts on the pinion carrier, cause gear ring to have the trend of counter-rotating, can stop the gear ring counter-rotating by the free-wheel clutch counter torque that imposes restriction.The moment of torsion of motor output and constraint reaction square are synthetic by planetary wheel, stack, and by pinion carrier output, powered vehicle starts to walk and travels.Free-wheel clutch can make control policy oversimplify easier realization.
Under steam under the operating mode of start the engine: drg 7 discharges, power-transfer clutch 6 closures, and Motor torque is delivered on the engine shaft by power-transfer clutch 6, and driving engine has the trend of forward rotation.Driving engine this moment forward rotation freely; The free-wheel clutch mounting means has determined it to allow engine free ground forward rotation, so driving engine is quickened and starts.
Behind the engine starting, engine shaft just changes, and drg 7 discharges, and allows engine free ground forward rotation; By its mounting means decision, free-wheel clutch 8 allows engine free ground forward rotation, so driving engine can freely rotate normal operation.
Damped condition under the pure motorized motions situation: power-transfer clutch 6 keeps separating, and driving engine is not worked; After beginning braking, drg 7 enters braking mode, and limiting engine rotates; Because the force of inertia of vehicle acts on the pinion carrier, cause gear ring to have the trend of forward rotation, can stop gear ring and driving engine just to change by the drg counter torque that imposes restriction; Motor output negative torque acts on the sun wheel; The brake torque of motor output and constraint reaction square are synthetic through planetary wheel, stack, by pinion carrier output brake torque, make car retardation.
Damped condition under the engine operation situation: before the braking, engine operation, drg 7 discharges.After beginning braking, power-transfer clutch 6 separates, and drg changes into braking mode by release position, and driving engine is stopped operating; Because the force of inertia of vehicle acts on the pinion carrier, cause gear ring to have the trend of forward rotation, can stop gear ring and driving engine just to change by the drg counter torque that imposes restriction; Motor output negative torque acts on the sun wheel; The brake torque of motor output and constraint reaction square are synthetic through sun and planet gear, stack, by pinion carrier output brake torque, make car retardation.
Drg can be any type of mechanical device, as long as it can be according to the forward and the backward rotation of demand for control limiting engine axle, as: rotary drum external contracting drum brake, multi-disc oil-immersed multi-disk brake, be similar to the pawl type drg of the synchro in the hand-operated transmission, the free-wheel clutch of may command direction, or the like.
Claims (3)
1. full hybrid power system of automobile oil electricity, comprise driving engine (1), with driving engine bonded assembly sun and planet gear (3), motor (2), with sun and planet gear bonded assembly change speed gear box (4), the mouth of change speed gear box and the axle drive shaft of wheel are connected, it is characterized in that: described sun and planet gear (3) has three gear wheel shafts at least, i.e. gear ring axle (R), sun wheel shaft (S) and pinion carrier axle (C); The rotor of motor (2) is connected with sun wheel shaft (S), sun wheel shaft (S) is connected by power-transfer clutch (6) and gear ring axle (R), the mouth of driving engine (1) and gear ring axle (R) are connected, change speed gear box (4) is connected with the mouth of pinion carrier axle (C), and the mouth of the axle drive shaft of wheel and change speed gear box (4) is connected; One drg (7) is located on the axle of driving engine (1).
2. the full hybrid power system of a kind of automobile oil electricity according to claim 1 is characterized in that: also be provided with an isolator (8) on the axle of driving engine (1).
3. equal the ratio of the tooth number Z R of moment of inertia JR on the gear ring axle (R) and gear ring axle (R) according to the ratio of the tooth number Z S of the moment of inertia JS on claim 1 or the 2 described sun wheel shaft (S) and sun wheel (S '), promptly satisfy equation:
J
S/Z
S＝J
R/Z
R。
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| CN111016617A (en) * | 2018-10-09 | 2020-04-17 | 郑州宇通客车股份有限公司 | Planet row hybrid power system and vehicle |
| FR3101042A1 (en) * | 2019-09-20 | 2021-03-26 | Beijing New Energy Vehicle Technology Innovation Center Co., Ltd. | Hybrid vehicle system and its control method |
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