CN104390000B - Electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission - Google Patents

Electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission Download PDF

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Publication number
CN104390000B
CN104390000B CN201410471575.1A CN201410471575A CN104390000B CN 104390000 B CN104390000 B CN 104390000B CN 201410471575 A CN201410471575 A CN 201410471575A CN 104390000 B CN104390000 B CN 104390000B
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gear
gears
control
electromagnetic clutch
downshift
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CN104390000A (en
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曲金玉
任传波
田香玉
殷允朝
朱慎超
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Shandong University of Technology
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Shandong University of Technology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04Smoothing ratio shift
    • F16H61/0437Smoothing ratio shift by using electrical signals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04Smoothing ratio shift
    • F16H2061/0474Smoothing ratio shift by smoothing engagement or release of positive clutches; Methods or means for shock free engagement of dog clutches

Abstract

The invention discloses a kind of electric automobile three and keep off the downshift course control method for use of line traffic control automatic transmission, the method is determined a need for being down to a gear by two gears, being down to two grades by three gears by detection D position switch signal, the GES v of vehicle speed sensor, the opening amount signal α of motor accelerator pedal position sensor by ECU, and the electromagnetic clutch electrical current carrying out each downshift process controls.This downshift course control method for use not only can avoid the interruption of motor input power during downshift, and can avoid shift shock, it is achieved the steady downshift of line traffic control automatic transmission.

Description

Electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission
Technical field
The present invention relates to the control method of a kind of automatic transmission, a kind of electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission.
Background technology
Automatic transmission is widely used in the various vehicles such as automobile, electric automobile, engineering machinery.Existing automatic transmission mainly has hydraulic mechanical type automatic transmission (AT), metal band type ST (CVT), automatic mechanical transmission (AMT), double-clutch automatic transmission (DCT) four major types.
Above-mentioned four class automatic transmission all use electric-controlled hydraulic servomechanism installation, it is achieved shift process controls, and structure is complicated, cost is high and adds control difficulty and complexity.The executing agency of especially DCT includes: the oil supply mechanism that is made up of hydraulic pump, hydraulic valve and accumulator, by hydraulic pressure or motor-driven gear shifting actuating mechanism, by hydraulic pressure or motor-driven clutch operating device.These hydraulic controls make speed changer complicated integral structure, cost high and add control difficulty and complexity.
Along with automotive electronic technology, the extensive application of the progressively ripe and automobile network communication technology of automatic control technology, X-by-wire on Automobile has become the development trend that automobile is following;Automobile line traffic control (X-By-Wire) technology replaces mechanically and hydraulically system with electric wire and electronic controller exactly, the control action of driver is become the signal of telecommunication through sensor, it is input to ECU, thus produces control signal and drive executing agency to carry out action required.X-by-wire on Automobile can reduce the complexity of parts, reduces hydraulic pressure and mechanical driving device, and electric wire moves towards the flexibility arranged simultaneously, expands the free space of Automobile Design.
Electric automobile three keeps off line traffic control automatic transmission, and one end of its input gear is connected with transmission input shaft, and the other end of input gear often engages with a gear high gear, two gear high gears, three gear high gears, the idle pulley that reverses gear successively along gear outer circumferential;One gear high gear, two gear high gears, three gear high gears, reverse gear high gear respectively by one gear electromagnetic clutch, two gear electromagnetic clutch, three gear electromagnetic clutch, reverse gear electromagnetic clutch with one gear main shaft, two gear main shafts, three gear main shafts, the main shaft that reverses gear connection;One gear main shaft, two gear main shafts, three gear main shafts, the main shaft that reverses gear are distributed in the periphery of transmission countershaft;Controlled the joint of each gear high gear and driving gear by ECU by each gear electromagnetic clutch and separate, realize electric automobile three and keep off the gearshift control of line traffic control automatic transmission line traffic control, there is compact conformation, use the advantages such as line traffic control power shifting, mechanical or hydraulic gear-shifting parts.
For guaranteeing that electric automobile three keeps off the steady gearshift of line traffic control automatic transmission, it is to avoid the interruption of motor input power and shift shock in shift process, the shift process that electric automobile three keeps off line traffic control automatic transmission is needed to be controlled.
Summary of the invention
It is an object of the invention to provide a kind of interruption that can either avoid motor input power in shift process and shift shock, the electric automobile three being capable of again the steady downshift of vehicle keeps off the downshift course control method for use of line traffic control automatic transmission.A kind of electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission, realize the electric automobile three of this control method to keep off the control device of line traffic control automatic transmission and include motor, D position switch, vehicle speed sensor, motor accelerator pedal position sensor, ECU, a gear electromagnetic clutch, two gear electromagnetic clutch, three gear electromagnetic clutch, ECU has been previously stored two gears fall one gear law curves, three gear fall two gear law curves.
Technical scheme is as follows:
After motor starting, ECU powers on, and electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission and brings into operation, and this control method comprises the following steps:
Step 1, ECU detection D position switch signal, the GES v of vehicle speed sensor, the opening amount signal α of motor accelerator pedal position sensor;
Step 2, judge whether to be linked into D gear: when ECU detects that D position switch signal is connected, carry out step 3;Otherwise, when ECU detects D position switch signal access failure, step 1 is carried out;
Step 3, judge whether to need two gears to be down to a gear: when ECU detects that the GES v of vehicle speed sensor and the opening amount signal α of motor accelerator pedal position sensor meets the downshift point that electric automobile three keeps off in line traffic control automatic transmission downshift law curve on two gear fall one gear law curves, it is judged as needing two gears to be down to a gear, carries out step 4;Otherwise, when ECU detects that the GES v of vehicle speed sensor and the opening amount signal α of motor accelerator pedal position sensor is unsatisfactory for the downshift point that electric automobile three keeps off in line traffic control automatic transmission downshift law curve on two gear fall one gear law curves, it is judged as that need not two gears is down to a gear, carries out step 6;
Step 4, two gears are down to a gear process control: ECU is by a gear electromagnetic clutch electrical current function I1a(t)={I1, 0≤t≤Tδ;kI1+I1(1-k)(t-Tδ)/(T21-Tδ),Tδ<t≤T21Control an electrical current keeping off electromagnetic clutch, and simultaneously by two gear electromagnetic clutch electrical current function I2a(t)={I2, 0≤t≤βTδ; 0,βTδ<t≤T21Control two electrical currents keeping off electromagnetic clutch, in formula: I1It is the rated value of the electrical current of a gear electromagnetic clutch, I2It is the rated value of the electrical current of two gear electromagnetic clutch, TδFor eliminating the minimum conduction time required for a gear electromagnetic clutch Separation, T21Being that two gears are down to a gear and are fixed the control cycle, k is bond strength coefficient, and β is for postponing disengaging time coefficient;
Step 5, judge that two gears are down to a gear and are controlled process duration t and whether be down to less than two gears that a gear is fixing controls cycle T21: it is down to a gear control process duration t when two gears and is down to a gear fixing control cycle T less than two gears21Time, it is judged that be two gears be down to one gear control process not yet terminate, return to step 4;Otherwise, it is down to a gear control process duration t when two gears and is down to a gear fixing control cycle T more than or equal to two gears21Time, it is judged that be two gears be down to one gear control process terminate, return to step 1;
Step 6, judge whether to need three gears to be down to two gears: when ECU detects that the GES v of vehicle speed sensor and the opening amount signal α of motor accelerator pedal position sensor meets the downshift point that electric automobile three keeps off in line traffic control automatic transmission downshift law curve on three gear fall two gear law curves, it is judged as needing three gears to be down to two gears, carries out step 7;Otherwise, when ECU detects that the GES v of vehicle speed sensor and the opening amount signal α of motor accelerator pedal position sensor is unsatisfactory for the downshift point that electric automobile three keeps off in line traffic control automatic transmission downshift law curve on three gear fall two gear law curves, it is judged as that need not three gears is down to two gears, returns to step 1;
Step 7, three gears are down to two gear process control: ECU is by two gear electromagnetic clutch electrical current function I2b(t)={I2, 0≤t≤Tδ;kI2+I2(1-k)(t-Tδ)/(T32-Tδ),Tδ<t≤T32Control two electrical currents keeping off electromagnetic clutch, and simultaneously by three gear electromagnetic clutch electrical current function I3b(t)={I3 0≤t≤βTδ; 0,βTδ<t≤T32Control three electrical currents keeping off electromagnetic clutch, in formula: I2It is the rated value of the electrical current of two gear electromagnetic clutch, I3It is the rated value of the electrical current of three gear electromagnetic clutch, TδFor eliminating the minimum conduction time required for two gear electromagnetic clutch Separations, T32Being that three gears are down to two gears and are fixed the control cycle, k is bond strength coefficient, and β is for postponing disengaging time coefficient;
Step 8, judge that three gears are down to two gears and are controlled process duration t and whether be down to less than three gears that two gears are fixing controls cycle T32: it is down to two gears control process duration t when three gears and is down to two gears fixing control cycle T less than three gears32Time, it is judged that be three gears be down to two gears control processes not yet terminate, return to step 7;Otherwise, it is down to two gears control process duration t when three gears and is down to two gears fixing control cycle T more than or equal to three gears32Time, it is judged that be three gears be down to two gears control processes terminate, return to step 1.
After driver turns off switch, ECU power-off, electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission to be terminated to run.
Be down to a gear process control at above-mentioned steps 4 two gear, step 7 three gear is down in two gear process control, and bond strength coefficient k is the fixed value set, k=0.5~0.8;Postponing disengaging time factor beta is the fixed value set, β=0.8~1.2.
Being down in a gear process control at above-mentioned steps 4 two gear, two gears are down to a gear fixing control cycle T21It is the fixed value set, T21=500~1000ms.
Being down in two gear process control at above-mentioned steps 7 three gear, three gears are down to two gears fixing control cycle T32It is the fixed value set, T32=400~700ms.
Compared with prior art, its advantage is the present invention:
(1) electric automobile three of the present invention keeps off the downshift course control method for use of line traffic control automatic transmission, the electromagnetic clutch Separation of low gear can be quickly eliminated during downshift, and it is stepped up the electrical current of the electromagnetic clutch of low gear, the smooth-going of the electromagnetic clutch transmission moment achieving low gear increases, thus the shift shock phenomenon during avoiding downshift;
(2) electric automobile three of the present invention keeps off the downshift course control method for use of line traffic control automatic transmission, the electromagnetic clutch that can control high gear during downshift ensures reliably to engage before the electromagnetic clutch of low gear does not transmits moment, keep power transmission, and after the electromagnetic clutch of low gear starts to transmit power, the electromagnetic clutch quick separating of high gear, thus the power interruption phenomenon during avoiding downshift.
Accompanying drawing explanation
Fig. 1 is that the electric automobile three of the embodiment of the present invention keeps off a gear of line traffic control automatic transmission and the control device reversed gear and transmission structures schematic diagram.
Fig. 2 is that the electric automobile three of the embodiment of the present invention keeps off two gears of line traffic control automatic transmission and the control devices of three gears and transmission structures schematic diagrames.
Fig. 3 is the downshift course control method for use flow chart that embodiment of the present invention electric automobile three keeps off line traffic control automatic transmission.
Fig. 4 is that embodiment of the present invention electric automobile three keeps off line traffic control automatic transmission downshift law curve schematic diagram.
Fig. 5 is the gear electromagnetic clutch electrical current function I that embodiment of the present invention electric automobile three keeps off line traffic control automatic transmission1a(t) curve and two gear electromagnetic clutch electrical current function I2a(t) curve synoptic diagram.
Fig. 6 is the two gear electromagnetic clutch electrical current function I that embodiment of the present invention electric automobile three keeps off line traffic control automatic transmission2b(t) curve and three gear electromagnetic clutch electrical current function I3b(t) curve synoptic diagram.
In figure: 1. motor 2. case of transmission 23. transmission input shaft 24. transmission countershaft 25. transmission output shafts 3. input gear 31. reverse gear idle pulley 41. 1 keep off electromagnetic clutch 411. 1 gear electromagnetic clutch slip ring 412. 1 gear electromagnetic clutch brushes 42. 2 keep off electromagnetic clutch 421. 2 gear electromagnetic clutch slip ring 422. 2 gear electromagnetic clutch brushes 43. 3 keep off electromagnetic clutch 431. 3 gear electromagnetic clutch slip rings 432. 3 gear electromagnetic clutch brushes 44. reverse gear electromagnetic clutch The 441. electromagnetic clutch slip ring 442. electromagnetic clutch brush 4Z1. mono-that reverse gear that reverse gear keep off main shaft 4Z2. bis-keeps off main shaft 4Z3. tri-and keeps off main shaft 4Z4. and reverse gear main shaft 51. 1 gear high gears 52. 2 keep off high gear 53. 3 gear high gears 54. reverse gear high gear 61. 1 gear driving gears 62. 2 keep off driving gear 63. 3 gear driving gears 64. reverse gear driving gear 71. 1 gear driven gears 72. 2 keep off driven gear 73. 3 gear driven gears 74. reverse gear driven gear 91. sun gear 92. planetary gears 93. gear ring 94. planet carriers 100. ECU 100a. mono-keep off the sub-100b. in control output end bis-and keep off the sub-100c. in control output end tri-and keep off the sub-100d. in control output end and reverse gear control output end sub-VSS. vehicle speed sensor D-SW.D position switch M-APS. motor accelerator pedal position sensor D21. two gear fall one gear law curve D32. three gear fall two gear law curves.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is described in detail, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments;Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise broadly falls into the scope of protection of the invention.
A kind of electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission, realize the electric automobile three of the embodiment of the present invention to keep off the control device of line traffic control automatic transmission and include that motor 1, D position switch D-SW, vehicle speed sensor VSS, motor accelerator pedal position sensor M-APS, ECU 100, gear electromagnetic clutch 41, two gear electromagnetic clutch 42, three keeps off electromagnetic clutch 43, ECU 100 has been previously stored two gears fall one gear law curve D21, three gear fall two gear law curve D32
Be installed with gear electromagnetic clutch brush 412, two gear electromagnetic clutch brush 422, a three gear electromagnetic clutch brush 432 on housing 2, reverse gear electromagnetic clutch brush 442, and gear electromagnetic clutch brush 412, two gear electromagnetic clutch brush 422, a three gear electromagnetic clutch brush 432, the electromagnetic clutch brush 442 that reverses gear keep sliding contact with gear electromagnetic clutch slip ring 411, two gear electromagnetic clutch slip ring 421, a three gear electromagnetic clutch slip ring 431, the electromagnetic clutch slip ring 441 that reverses gear respectively;The one gear binding post of electromagnetic clutch brush 412, the two gear binding posts of electromagnetic clutch brush 422, the three gear binding posts of electromagnetic clutch brush 432, the binding post of the electromagnetic clutch brush 442 that reverses gear are connected with the one of the ECU 100 gear 100a in control output end, the two gear 100b in control output end, three the gear 100c in control output end, the sub-100d in control output end of reversing gear by wire respectively.
ECU 100, by controlling gear electromagnetic clutch brush 412, two gear electromagnetic clutch brush 422, a three gear electromagnetic clutch brush 432, the energising of the electromagnetic clutch brush 442 that reverses gear or power-off, controls gear electromagnetic clutch 41, two gear electromagnetic clutch 42, a three gear electromagnetic clutch 43, the joint of the electromagnetic clutch 44 that reverses gear and separation;ECU 100 keeps off electromagnetic clutch brush 432, the reverse gear power-on voltage of electromagnetic clutch brush 442 or the size of electric current by controlling gear electromagnetic clutch brush 412, a two gear electromagnetic clutch brush 422, three, controls gear electromagnetic clutch 41, a two gear electromagnetic clutch 42, three and keeps off electromagnetic clutch 43, the reverse gear joint of electromagnetic clutch 44 and the speed of separation.
Realize the electric automobile three of the present invention to keep off the transmission device of line traffic control automatic transmission and include input gear 3, transmission input shaft 23, transmission countershaft 24, transmission output shaft 25, housing 2;One end of input gear 3 is connected with one end of transmission input shaft 23;The other end of transmission input shaft 23 is connected with motor 1;Being fixedly connected sequentially on transmission countershaft 24, three gear driven gear 73, two gear driven gears 72, keep off driven gears 71, reverse gear driven gear 74, and one end away from input gear 3 of countershaft 24 is also fixedly connected with sun gear 91 in the transmission.
Input gear 3 often engages with gear high gear 51, two gear high gear 52, a three gear high gear 53, the idle pulley 31 that reverses gear successively along its gear outer circumferential, reverses gear idle pulley 31 and often engages with the high gear 54 that reverses gear.
One gear high gear 51, two gear high gear 52, three gear high gear 53, the high gear 54 that reverses gear are connected with a gear Partner for electromagnetic clutch 41, the two gear Partner of electromagnetic clutch 42, the three gear Partner of electromagnetic clutch 43, the Partner of the electromagnetic clutch 44 that reverses gear respectively;The one gear drive end of electromagnetic clutch 41, the two gear drive ends of electromagnetic clutch 42, the three gear drive ends of electromagnetic clutch 43, the drive end of the electromagnetic clutch 44 that reverses gear are connected by a gear main shaft 4Z1, two gear main shaft 4Z2, three gear main shaft 4Z3, main shaft 4Z4 and gear driving gear 61, two gear driving gear 62, the three gear driving gear 63 that reverses gear, the driving gear 64 that reverses gear respectively;One gear driving gear 61, two gear driving gear 62, three gear driving gear 63, the driving gear 64 that reverses gear often engage with gear driven gear 71, two gear driven gear 72, a three gear driven gear 73, the driven gear 74 that reverses gear respectively.
Sun gear 91 often engages with planetary gear 92, planetary gear 92 also often engages with gear ring 93, planetary gear 92 is rolled by its center bearing bore and is arranged on planet carrier 94, planet carrier 94 is fixed on case of transmission 2, gear ring 93 is fixed on one end of transmission output shaft 25 by spline, and the other end of transmission output shaft 25 is as transmission power output.
Each forward gear that the electric automobile three of the embodiment of the present invention keeps off line traffic control automatic transmission and the power transmission line reversed gear is further illustrated below in conjunction with Fig. 1, Fig. 2.
One gear transmission: ECU 100 controls gear electromagnetic clutch 41 energising and engages, remaining electromagnetic clutch power-off separates, the moment of torsion of motor 1 passes to input gear 3 by transmission input shaft 23, this moment of torsion is passed to a gear high gear 51 by input gear 3 further, a gear electromagnetic clutch 41 by engaging is kept off the engagement of driving gear 61 and a gear driven gear 71 by one and power is transferred to sun gear 91 again, central spline finally by gear ring 93 exports to transmission output shaft 25, it is achieved a gear transmission.
Two gear transmissions: ECU 100 controls two gear electromagnetic clutch 42 energisings and engages, remaining electromagnetic clutch power-off separates, the moment of torsion of motor 1 passes to input gear 3 by transmission input shaft 23, this moment of torsion is passed to two gear high gears 52 by input gear 3 further, the two gear electromagnetic clutch 42 by engaging are kept off the engagement of driving gears 62 and two gear driven gears 72 by two and power are transferred to sun gear 91 again, central spline finally by gear ring 93 exports to transmission output shaft 25, it is achieved two gear transmissions.
Three gear transmissions: ECU 100 controls three gear electromagnetic clutch 43 energisings and engages, remaining electromagnetic clutch power-off separates, the moment of torsion of motor 1 passes to input gear 3 by transmission input shaft 23, this moment of torsion is passed to three gear high gears 53 by input gear 3 further, the three gear electromagnetic clutch 43 by engaging are kept off the engagement of driving gears 63 and three gear driven gears 73 by three and power are transferred to sun gear 91 again, central spline finally by gear ring 93 exports to transmission output shaft 25, it is achieved three gear transmissions.
Reverse gear: ECU 100 controls the electromagnetic clutch 44 energising joint that reverses gear, remaining electromagnetic clutch power-off separates, the moment of torsion of motor 1 passes to input gear 3 by transmission input shaft 23, this moment of torsion is passed to reverse gear idle pulley 31 and the high gear 54 that reverses gear by input gear 3 further, power is transferred to sun gear 91 by the electromagnetic clutch 44 engagement by reverse gear driving gear 64 and the driven gear 74 that reverses gear of reversing gear by engaging again, central spline finally by gear ring 93 exports to transmission output shaft 25, it is achieved reverse gear.
Neutral: ECU 100 controls gear electromagnetic clutch 41, two gear electromagnetic clutch 42, a three gear electromagnetic clutch 43, the electromagnetic clutch 44 that reverses gear is in power-off released state, it is achieved neutral.
The electric automobile three of the present invention keeps off the downshift course control method for use flow chart of line traffic control automatic transmission as shown in Figure 3, after motor 1 starts, ECU 100 powers on, and electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission and brings into operation, and this control method comprises the following steps:
Step S1, ECU 100 detect D position switch D-SW signal, the GES v of vehicle speed sensor VSS, the opening amount signal α of motor accelerator pedal position sensor M-APS;
Step S2, judge whether to be linked into D gear: when ECU 100 detects that D position switch D-SW signal is connected, carry out step S3;Otherwise, when ECU 100 detects D position switch D-SW signal access failure, step S1 is carried out;
Step S3, judge whether to need two gears to be down to a gear: electric automobile three as shown in Figure 4 keeps off line traffic control automatic transmission downshift law curve, when ECU 100 detects that the opening amount signal α of the GES v and motor accelerator pedal position sensor M-APS of vehicle speed sensor VSS meets electric automobile three and keeps off two gear fall one gear law curve D in line traffic control automatic transmission downshift law curve21On downshift point time, it is judged that for needs two gear be down to a gear, carry out step S4;Otherwise, detect that the opening amount signal α of the GES v and motor accelerator pedal position sensor M-APS of vehicle speed sensor VSS is unsatisfactory for electric automobile three and keeps off two gear fall one gear law curve D in line traffic control automatic transmission downshift law curve when ECU 10021On downshift point time, it is judged that being down to a gear for need not two gears, carrying out step S6;
Step S4, two gears are down to a gear process control: ECU 100 is by a gear electromagnetic clutch 41 electrical current function I1a(t)={I1, 0≤t≤Tδ;kI1+I1(1-k)(t-Tδ)/(T21-Tδ),Tδ<t≤T21Control an electrical current keeping off electromagnetic clutch 41, and simultaneously by two gear electromagnetic clutch 42 electrical current function I2a(t)={I2, 0≤t≤βTδ; 0,βTδ<t≤T21Control two electrical currents keeping off electromagnetic clutch 42, in formula: I1It is the rated value of the electrical current of a gear electromagnetic clutch 41, I2It is the rated value of the electrical current of two gear electromagnetic clutch 42, TδFor eliminating the minimum conduction time required for gear electromagnetic clutch 41 Separation, T21Being that two gears are down to a gear and are fixed the control cycle, k is bond strength coefficient, and β is for postponing disengaging time coefficient;
Step S5, judge that two gears are down to a gear and are controlled process duration t and whether be down to less than two gears that a gear is fixing controls cycle T21: it is down to a gear control process duration t when two gears and is down to a gear fixing control cycle T less than two gears21Time, it is judged that be two gears be down to one gear control process not yet terminate, return to step S4;Otherwise, it is down to a gear control process duration t when two gears and is down to a gear fixing control cycle T more than or equal to two gears21Time, it is judged that be two gears be down to one gear control process terminate, return to step S1;
Step S6, judge whether to need three gears to be down to two gears: electric automobile three as shown in Figure 4 keeps off line traffic control automatic transmission downshift law curve, when ECU 100 detects that the opening amount signal α of the GES v and motor accelerator pedal position sensor M-APS of vehicle speed sensor VSS meets electric automobile three and keeps off three gear fall two gear law curve D in line traffic control automatic transmission downshift law curve32On downshift point time, it is judged that for needs three gear be down to two gears, carry out step S7;Otherwise, detect that the opening amount signal α of the GES v and motor accelerator pedal position sensor M-APS of vehicle speed sensor VSS is unsatisfactory for electric automobile three and keeps off three gear fall two gear law curve D in line traffic control automatic transmission downshift law curve when ECU 10032On downshift point time, it is judged that being down to two gears for need not three gears, returning to step S1;
Step S7, three gears are down to two gear process control: ECU 100 is by two gear electromagnetic clutch 42 electrical current function I2b(t)={I2, 0≤t≤Tδ;kI2+I2(1-k)(t-Tδ)/(T32-Tδ),Tδ<t≤T32Control two electrical currents keeping off electromagnetic clutch 42, and simultaneously by three gear electromagnetic clutch 43 electrical current function I3b(t)={I3, 0≤t≤βTδ; 0,βTδ<t≤T32Control three electrical currents keeping off electromagnetic clutch 43, in formula: I2It is the rated value of the electrical current of two gear electromagnetic clutch 42, I3It is the rated value of the electrical current of three gear electromagnetic clutch 43, TδFor eliminating the minimum conduction time required for two gear electromagnetic clutch 42 Separations, T32Being that three gears are down to two gears and are fixed the control cycle, k is bond strength coefficient, and β is for postponing disengaging time coefficient;
Step S8, judge that three gears are down to two gears and are controlled process duration t and whether be down to less than three gears that two gears are fixing controls cycle T32: it is down to two gears control process duration t when three gears and is down to two gears fixing control cycle T less than three gears32Time, it is judged that be three gears be down to two gears control processes not yet terminate, return to step S7;Otherwise, it is down to two gears control process duration t when three gears and is down to two gears fixing control cycle T more than or equal to three gears32Time, it is judged that be three gears be down to two gears control processes terminate, return to step S1.
After driver turns off switch, ECU 100 power-off, electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission to be terminated to run.
In the present embodiment, bond strength coefficient k is taken as 0.6;Postpone disengaging time factor beta and be taken as 1.0;Two gears are down to a gear fixing control cycle T21It is taken as 700ms;Three gears are down to two gears fixing control cycle T32It is taken as 550ms;Eliminate the T minimum conduction time required for gear electromagnetic clutch 41 Separation1 δWith the T minimum conduction time eliminated required for two gear electromagnetic clutch 42 Separations2 δAll it is taken as 250ms.
Further illustrate embodiment of the present invention step S3 below in conjunction with Fig. 4, Fig. 5 and judge whether that two gears are down to a gear and step S4 bis-gear is down to a gear process control procedure:
As shown in Figure 4, embodiment of the present invention electric automobile three keeps off line traffic control automatic transmission downshift law curve schematic diagram, D21It is two gear fall one gear law curves, D32It is three gear fall two gear law curves;When GES v and accelerator pedal opening amount signal α runs to A (28,50) point, ECU 100 keeps off line traffic control automatic transmission downshift law curve according to electric automobile three and judges that A point is as two gear fall one gear law curve D21On downshift point, then carry out two gears and be down to a gear process control;
As it is shown in figure 5, embodiment of the present invention electric automobile three keeps off a gear electromagnetic clutch electrical current function I of line traffic control automatic transmission1a(t) curve and two gear electromagnetic clutch electrical current function I2a(t) curve synoptic diagram, a gear electromagnetic clutch 41 electrical current function I1a(t)={I1, 0≤t≤250ms; 0.6·I1+0.4·I1·(t-250)/450, 250ms < t≤700ms}, two gear electromagnetic clutch 42 electrical current function I2a(t)={I2, 0≤t≤250ms; 0, 250ms<t≤700ms}。
Further illustrate embodiment of the present invention step S6 below in conjunction with Fig. 4, Fig. 6 and judge whether that three gears are down to two gears and step S7 tri-gear is down to two gear process control procedure:
As shown in Figure 4, embodiment of the present invention electric automobile three keeps off line traffic control automatic transmission downshift law curve schematic diagram, when GES v and accelerator pedal opening amount signal α runs to B (72,50), during point, ECU 100 keeps off line traffic control automatic transmission downshift law curve according to electric automobile three and judges that B point is as three gear fall two gear law curve D32On downshift point, then carry out three gears and be down to two gear process control;
As shown in Figure 6, embodiment of the present invention electric automobile three keeps off two gear electromagnetic clutch electrical current function I of line traffic control automatic transmission2b(t) curve and three gear electromagnetic clutch electrical current function I3b(t) curve synoptic diagram, two gear electromagnetic clutch 42 electrical current function I2b(t)={I2, 0≤t≤250ms; 0.6·I2+0.4·I2·(t-250)/300, 250ms < t≤550ms}, three gear electromagnetic clutch 43 electrical current function I3b(t)={I3, 0≤t≤250ms; 0, 250ms<t≤550ms}。
Above in conjunction with accompanying drawing, embodiments of the present invention are explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that art those of ordinary skill is possessed, it is also possible on the premise of without departing from present inventive concept, various changes can be made.

Claims (4)

1. an electric automobile three keeps off the downshift course control method for use of line traffic control automatic transmission, realize the electric automobile three of this control method to keep off the control device of line traffic control automatic transmission and include motor (1), D position switch (D-SW), vehicle speed sensor (VSS), motor accelerator pedal position sensor (M-APS), ECU (100), gear electromagnetic clutch (41), two gears electromagnetic clutch (42), three gears electromagnetic clutch (43), ECU (100) has been previously stored two gears fall one gear law curve (D21), three gear fall two gear law curve (D32), it is characterised in that described control method comprises the following steps:
Step 1, ECU (100) detection D position switch (D-SW) signal, the GES v of vehicle speed sensor (VSS), the opening amount signal α of motor accelerator pedal position sensor (M-APS);
Step 2, judge whether to be linked into D gear: when ECU (100) detects that D position switch (D-SW) signal is connected, carry out step 3;Otherwise, when ECU (100) detects D position switch (D-SW) signal access failure, step 1 is carried out;
Step 3, judge whether to need two gears to be down to a gear: when ECU (100) detects that the GES v of vehicle speed sensor (VSS) and the opening amount signal α of motor accelerator pedal position sensor (M-APS) meets electric automobile three and keeps off two gear fall one gear law curve (D in line traffic control automatic transmission downshift law curve21During downshift point on), it is judged that be down to a gear for needs two gear, carry out step 4;Otherwise, detect that the GES v of vehicle speed sensor (VSS) and the opening amount signal α of motor accelerator pedal position sensor (M-APS) is unsatisfactory for electric automobile three and keeps off two gear fall one gear law curve (D in line traffic control automatic transmission downshift law curve when ECU (100)21During downshift point on), it is judged that being down to a gear for need not two gears, carrying out step 6;
Step 4, two gears are down to a gear process control: ECU (100) is by gear electromagnetic clutch (41) electrical current function I1a(t)={I1,0≤t≤Tδ;kI1+I1(1-k)(t-Tδ)/(T21-Tδ),Tδ<t≤T21Control an electrical current keeping off electromagnetic clutch (41), and simultaneously by two gear electromagnetic clutch (42) electrical current function I2a(t)={I2, 0≤t≤βTδ; 0,βTδ<t≤T21Control two electrical currents keeping off electromagnetic clutch (42), in formula: I1It is the rated value of the electrical current of a gear electromagnetic clutch (41), I2It is the rated value of the electrical current of two gear electromagnetic clutch (42), TδFor eliminating the minimum conduction time required for gear electromagnetic clutch (41) Separation, T21Being that two gears are down to a gear and are fixed the control cycle, k is bond strength coefficient, and β is for postponing disengaging time coefficient;
Step 5, judge that two gears are down to a gear and are controlled process duration t and whether be down to less than two gears that a gear is fixing controls cycle T21: it is down to a gear control process duration t when two gears and is down to a gear fixing control cycle T less than two gears21Time, it is judged that be two gears be down to one gear control process not yet terminate, return to step 4;Otherwise, it is down to a gear control process duration t when two gears and is down to a gear fixing control cycle T more than or equal to two gears21Time, it is judged that be two gears be down to one gear control process terminate, return to step 1;
Step 6, judge whether to need three gears to be down to two gears: when ECU (100) detects that the GES v of vehicle speed sensor (VSS) and the opening amount signal α of motor accelerator pedal position sensor (M-APS) meets electric automobile three and keeps off three gear fall two gear law curve (D in line traffic control automatic transmission downshift law curve32During downshift point on), it is judged that be down to two gears for needs three gear, carry out step 7;Otherwise, detect that the GES v of vehicle speed sensor (VSS) and the opening amount signal α of motor accelerator pedal position sensor (M-APS) is unsatisfactory for electric automobile three and keeps off three gear fall two gear law curve (D in line traffic control automatic transmission downshift law curve when ECU (100)32During downshift point on), it is judged that being down to two gears for need not three gears, returning to step 1;
Step 7, three gears are down to two gear process control: ECU (100) is by two gear electromagnetic clutch (42) electrical current function I2b(t)={I2,0≤t≤Tδ;kI2+I2(1-k)(t-Tδ)/(T32-Tδ),Tδ<t≤T32Control two electrical currents keeping off electromagnetic clutch (42), and simultaneously by three gear electromagnetic clutch (43) electrical current function I3b(t)={I3, 0≤t≤βTδ; 0,βTδ<t≤T32Control three electrical currents keeping off electromagnetic clutch (43), in formula: I2It is the rated value of the electrical current of two gear electromagnetic clutch (42), I3It is the rated value of the electrical current of three gear electromagnetic clutch (43), TδFor eliminating the minimum conduction time required for two gear electromagnetic clutch (42) Separations, T32Being that three gears are down to two gears and are fixed the control cycle, k is bond strength coefficient, and β is for postponing disengaging time coefficient;
Step 8, judge that three gears are down to two gears and are controlled process duration t and whether be down to less than three gears that two gears are fixing controls cycle T32: it is down to two gears control process duration t when three gears and is down to two gears fixing control cycle T less than three gears32Time, it is judged that be three gears be down to two gears control processes not yet terminate, return to step 7;Otherwise, it is down to two gears control process duration t when three gears and is down to two gears fixing control cycle T more than or equal to three gears32Time, it is judged that be three gears be down to two gears control processes terminate, return to step 1.
2. electric automobile three as claimed in claim 1 keeps off the downshift course control method for use of line traffic control automatic transmission, it is characterized in that, be down to a gear process control at described step 4 two gear, step 7 three gear is down in two gear process control, described bond strength coefficient k is the fixed value set, k=0.5~0.8;Described delay disengaging time factor beta is the fixed value set, β=0.8~1.2.
3. electric automobile three as claimed in claim 1 keeps off the downshift course control method for use of line traffic control automatic transmission, it is characterised in that be down in a gear process control at described step 4 two gear, and described two gears are down to a gear fixing control cycle T21It is the fixed value set, T21=500~1000ms.
4. electric automobile three as claimed in claim 1 keeps off the downshift course control method for use of line traffic control automatic transmission, it is characterised in that be down in two gear process control at described step 7 three gear, and described three gears are down to two gears fixing control cycle T32It is the fixed value set, T32=400~700ms.
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CN106641230A (en) * 2016-11-22 2017-05-10 山东理工大学 Intervening control method for down shift of two-gear drive-by-wire automatic transmission of electric automobile
CN106438988A (en) * 2016-11-22 2017-02-22 山东理工大学 Intervening control method for downshifting of three-gear wire-driven automatic transmission of electric vehicle
CN106481803A (en) * 2016-11-22 2017-03-08 山东理工大学 Electric automobile two keeps off line traffic control automatic transmission shift intervention control method
CN112524243A (en) * 2020-12-04 2021-03-19 东风汽车集团有限公司 Pre-synchronization control method for clutches of double-clutch automatic gearbox

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Application publication date: 20150304

Assignee: Jun Tang Ling Ou, Shandong Automobile Manufacturing Co., Ltd.

Assignor: Shandong University of Technology

Contract record no.: 2017370000029

Denomination of invention: Downshift process control method of three-gear wire control automatic transmission of electric vehicle

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Record date: 20170426